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Linear / Accessory reference

Linear MDR/U plug-in radio receiver

MDR/U identifies a plug-in radio receiver. The cited source supports only the exact facts and relationships shown; other equipment pairings remain unverified.

US source scopeUpdated 2026-09-11Independent Anderson reference

Match the whole number.

Manufacturer identifier: MDR/U. Keep every character when comparing it with your label or paperwork. A similar number does not establish the same component.

Documented alternate identifiers

  • MDR-U
  • DNR00100
    • mdru pageDescription, Part Number · checked 2026-09-11 · Nice North America LLC
Values apply to the exact identifier and scope in the cited source.
Component functionPlug-in radio receiver
View source and citation details
Receiver memory10 transmitter codes
View source and citation details
OutputNormally open dry-contact relay
View source and citation details
Contact closure duration0.5 seconds
View source and citation details
Literature input power110 VAC +/- 10%, 60 Hz
View source and citation details
Channel count1 channel
View source and citation details
  • mdru pageDescription, first sentence · checked 2026-09-11 · Nice North America LLC
Radio frequency318 MHz
View source and citation details
  • mdru pageFeatures, RF frequency · checked 2026-09-11 · Nice North America LLC
Radio formatMegaCode
View source and citation details
  • mdru pageDescription and Features, Codes · checked 2026-09-11 · Nice North America LLC
Input power reviewThe literature gives 110 VAC +/- 10%, 60 Hz; manual 220675 A contains both 110 VAC and 120 VAC wording. Unit-label and electrical confirmation remain required.
View source and citation details

Documented fitment & exclusions

Read the exact equipment or component, market, production and variant limits in every row. An omitted pairing has not been verified by this reference.

A component pairing applies only to the listed items and source conditions. It does not establish suitability for an installed opener or compatibility through another component.

Source statements and their exact conditions. Read the documented direction and conditions for each pairing.
Equipment or component / relationshipEvidence and conditions
MDT-2A

Documented compatibility

From MDT-2A to MDR/U.

Conditional

Denco group scope and separately reviewed membership associate MDT-2A with MDR/U for the stated function.

Applies only within this source scope
  • Market: US
  • connection-purpose: MegaCode radio reception by MDR/U; exact code enrollment must be checked.
  • Bounded Denco supplier group association; verify the stated configuration. No physical or human engineering certification.
  • This association concerns the external receiver. Nearly any opener is not universal downstream fitment; confirm the receiver input, power, installation and programming requirements.
  • Custom block-coded and ordinary transmitter variants remain separate; no lot quantity or button count creates extra pairings.
ACT-21B

Documented compatibility

From ACT-21B to MDR/U.

Conditional

Denco group scope and separately reviewed membership associate ACT-21B with MDR/U for the stated function.

Applies only within this source scope
  • Market: US
  • connection-purpose: MegaCode radio reception by MDR/U; exact code enrollment must be checked.
  • Bounded Denco supplier group association; verify the stated configuration. No physical or human engineering certification.
  • This association concerns the external receiver. Nearly any opener is not universal downstream fitment; confirm the receiver input, power, installation and programming requirements.
  • Custom block-coded and ordinary transmitter variants remain separate; no lot quantity or button count creates extra pairings.
  • Denco supplier reference: RC DNR00100h1; span.sku; Description first bullet: explicit MDR/U designation, channel/type and Linear MegaCode transmitter scope; Description second connection bullet · checked 2026-09-12 · Denco
  • Denco supplier reference: RC ACP00615Product h1 and span.sku; Description: one-device MegaCode, custom block and lot quantity · checked 2026-09-12 · Denco
MDT-1B

Documented compatibility

From MDT-1B to MDR/U.

Conditional

Denco group scope and separately reviewed membership associate MDT-1B with MDR/U for the stated function.

Applies only within this source scope
  • Market: US
  • connection-purpose: MegaCode radio reception by MDR/U; exact code enrollment must be checked.
  • Bounded Denco supplier group association; verify the stated configuration. No physical or human engineering certification.
  • This association concerns the external receiver. Nearly any opener is not universal downstream fitment; confirm the receiver input, power, installation and programming requirements.
  • Custom block-coded and ordinary transmitter variants remain separate; no lot quantity or button count creates extra pairings.
  • Denco supplier reference: RC DNR00100h1; span.sku; Description first bullet: explicit MDR/U designation, channel/type and Linear MegaCode transmitter scope; Description second connection bullet · checked 2026-09-12 · Denco
  • Denco supplier reference: RC ACP00721Product h1 and visible supplier SKU; Description bullets: button/device count, MegaCode, custom block coding and lot quantity · checked 2026-09-12 · Denco
ACT-22B

Documented compatibility

From ACT-22B to MDR/U.

Conditional

Denco group scope and separately reviewed membership associate ACT-22B with MDR/U for the stated function.

Applies only within this source scope
  • Market: US
  • connection-purpose: MegaCode radio reception by MDR/U; exact code enrollment must be checked.
  • Bounded Denco supplier group association; verify the stated configuration. No physical or human engineering certification.
  • This association concerns the external receiver. Nearly any opener is not universal downstream fitment; confirm the receiver input, power, installation and programming requirements.
  • Custom block-coded and ordinary transmitter variants remain separate; no lot quantity or button count creates extra pairings.
  • Denco supplier reference: RC DNR00100h1; span.sku; Description first bullet: explicit MDR/U designation, channel/type and Linear MegaCode transmitter scope; Description second connection bullet · checked 2026-09-12 · Denco
  • Denco supplier reference: RC ACP00616AProduct h1 and span.sku; Description: two-button/three-channel mapping, custom block and lot quantity · checked 2026-09-12 · Denco
MDT-1A

Documented compatibility

From MDT-1A to MDR/U.

Conditional

Denco group scope and separately reviewed membership associate MDT-1A with MDR/U for the stated function.

Applies only within this source scope
  • Market: US
  • connection-purpose: MegaCode radio reception by MDR/U; exact code enrollment must be checked.
  • Bounded Denco supplier group association; verify the stated configuration. No physical or human engineering certification.
  • This association concerns the external receiver. Nearly any opener is not universal downstream fitment; confirm the receiver input, power, installation and programming requirements.
  • Custom block-coded and ordinary transmitter variants remain separate; no lot quantity or button count creates extra pairings.
MTS3

Documented compatibility

From MTS3 to MDR/U.

Conditional

Denco group scope and separately reviewed membership associate MTS3 with MDR/U for the stated function.

Applies only within this source scope
  • Market: US
  • connection-purpose: MegaCode radio reception by MDR/U; exact code enrollment must be checked.
  • Bounded Denco supplier group association; verify the stated configuration. No physical or human engineering certification.
  • This association concerns the external receiver. Nearly any opener is not universal downstream fitment; confirm the receiver input, power, installation and programming requirements.
  • Custom block-coded and ordinary transmitter variants remain separate; no lot quantity or button count creates extra pairings.
MDT-4A

Documented compatibility

From MDT-4A to MDR/U.

Conditional

Denco group scope and separately reviewed membership associate MDT-4A with MDR/U for the stated function.

Applies only within this source scope
  • Market: US
  • connection-purpose: MegaCode radio reception by MDR/U; exact code enrollment must be checked.
  • Bounded Denco supplier group association; verify the stated configuration. No physical or human engineering certification.
  • This association concerns the external receiver. Nearly any opener is not universal downstream fitment; confirm the receiver input, power, installation and programming requirements.
  • Custom block-coded and ordinary transmitter variants remain separate; no lot quantity or button count creates extra pairings.
MDT-2B

Documented compatibility

From MDT-2B to MDR/U.

Conditional

Denco group scope and separately reviewed membership associate MDT-2B with MDR/U for the stated function.

Applies only within this source scope
  • Market: US
  • connection-purpose: MegaCode radio reception by MDR/U; exact code enrollment must be checked.
  • Bounded Denco supplier group association; verify the stated configuration. No physical or human engineering certification.
  • This association concerns the external receiver. Nearly any opener is not universal downstream fitment; confirm the receiver input, power, installation and programming requirements.
  • Custom block-coded and ordinary transmitter variants remain separate; no lot quantity or button count creates extra pairings.
  • Denco supplier reference: RC DNR00100h1; span.sku; Description first bullet: explicit MDR/U designation, channel/type and Linear MegaCode transmitter scope; Description second connection bullet · checked 2026-09-12 · Denco
  • Denco supplier reference: RC ACP00720Product h1 and span.sku; Description: buttons/devices, MegaCode, custom block and lot quantity · checked 2026-09-12 · Denco
MDT-4B

Documented compatibility

From MDT-4B to MDR/U.

Conditional

Denco group scope and separately reviewed membership associate MDT-4B with MDR/U for the stated function.

Applies only within this source scope
  • Market: US
  • connection-purpose: MegaCode radio reception by MDR/U; exact code enrollment must be checked.
  • Bounded Denco supplier group association; verify the stated configuration. No physical or human engineering certification.
  • This association concerns the external receiver. Nearly any opener is not universal downstream fitment; confirm the receiver input, power, installation and programming requirements.
  • Custom block-coded and ordinary transmitter variants remain separate; no lot quantity or button count creates extra pairings.
  • Denco supplier reference: RC DNR00100h1; span.sku; Description first bullet: explicit MDR/U designation, channel/type and Linear MegaCode transmitter scope; Description second connection bullet · checked 2026-09-12 · Denco
  • Denco supplier reference: RC ACP00722Product h1 and span.sku; Description: buttons/devices, MegaCode, custom block and lot quantity · checked 2026-09-12 · Denco
ACT-31B

Documented compatibility

From ACT-31B to MDR/U.

Conditional

ACT-31B is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control
ACT-31C

Documented compatibility

From ACT-31C to MDR/U.

Conditional

ACT-31C is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control
ACT-31D

Documented compatibility

From ACT-31D to MDR/U.

Conditional

ACT-31D is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control
ACT-31DH

Documented compatibility

From ACT-31DH to MDR/U.

Conditional

ACT-31DH is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control
ACT-31DHC

Documented compatibility

From ACT-31DHC to MDR/U.

Conditional

ACT-31DHC is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control
ACT-34B

Documented compatibility

From ACT-34B to MDR/U.

Conditional

ACT-34B is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control
ACT-34C

Documented compatibility

From ACT-34C to MDR/U.

Conditional

ACT-34C is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control
ACT-34D

Documented compatibility

From ACT-34D to MDR/U.

Conditional

ACT-34D is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control
ACT-34DH

Documented compatibility

From ACT-34DH to MDR/U.

Conditional

ACT-34DH is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control
ACT-34DHC

Documented compatibility

From ACT-34DHC to MDR/U.

Conditional

ACT-34DHC is documented for MDR/U in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. This pairing concerns radio reception by MDR/U, not every opener connected downstream. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

Applies only within this source scope
  • Market: US
  • comparison-function: MegaCode radio control

Direct replacement paths

No direct successor for MDR/U is verified in this reference.

Earlier numbers this item is listed to replace

  • MDR/U replaces MDR only within the following source scope.

    MDR/U is documented as replacing MDR within the receiver/input/power scope shown.

    Applies only within this source scope
    • Market: US
    • operator-input: normally-open dry-contact pushbutton input
    • receiver-power: 110 VAC +/- 10%, 60 Hz
    • Replacement concerns the external radio receiver arrangement described by the source; it does not identify every operator model as compatible.
    • MDR/U supplies its own mains-powered receiver instead of the MDR arrangement with an external transformer. Exact equipment input and electrical suitability need confirmation.
    • Source manual 220675 A uses both 120 VAC and 110 VAC wording. The electrical condition preserves the literature's 110 VAC +/-10%, 60 Hz rating; check the unit label and qualified installation requirements.
    • No reverse interchangeability, automatic replacement chain, or receiver-disabling procedure is asserted.
    • MDR/U receiver literaturePage 1, second body paragraph contrasting MDR with external transformer and MDR/U · checked 2026-09-11 · 221931B · Linear LLC
    • MDR-U receiver installation instructionsPage 1 Product Description and power wording, both 110 VAC and 120 VAC references · checked 2026-09-11 · 220675 A · Linear Corporation

A direct replacement statement does not establish reverse interchangeability, a kit equivalent or a later replacement chain.

The listed pairing applies in the direction shown above. Open the listed component’s reference to check its pairing with this item. You can also look up another part or accessory. A missing pairing does not establish incompatibility.

Recall references

No recall reference is included for this identifier in the published dataset. This is not a safety clearance or proof that no recall exists.

Sources & scope

  1. Denco supplier reference: RC DNT00093Denco · US · checked 2026-09-12
  2. Denco supplier reference: RC DNT00052ADenco · US · checked 2026-09-12
  3. Denco supplier reference: RC DNT00053ADenco · US · checked 2026-09-12
  4. Denco supplier reference: RC DNT00054ADenco · US · checked 2026-09-12
  5. Denco supplier reference: RC DNR00100Denco · US · checked 2026-09-12
  6. Denco supplier reference: RC ACP00721Denco · US · checked 2026-09-12
  7. Denco supplier reference: RC ACP00720Denco · US · checked 2026-09-12
  8. Denco supplier reference: RC ACP00722Denco · US · checked 2026-09-12
  9. Denco supplier reference: RC ACP00615Denco · US · checked 2026-09-12
  10. Denco supplier reference: RC ACP00616ADenco · US · checked 2026-09-12
  11. ACT transmitter and TRANS PROX compatibility chartLinear LLC · US · checked 2026-09-11 · 232495 B
  12. MDR-U receiver installation instructionsLinear Corporation · US · checked 2026-09-11 · 220675 A
  13. MDR/U receiver literatureLinear LLC · US · checked 2026-09-11 · 221931B
  14. mdru pageNice North America LLC · US · checked 2026-09-11

Anderson prepared this reference from the listed evidence. Source statements are not an Anderson installation inspection or independent product test. Official documents stay on their publisher’s website.

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Confirm a missing detail

Use Linear official support and match the complete part number, equipment model and production details with the source scope.

Use safely accessible labels and existing paperwork. Do not remove powered covers or adjust springs or cables to identify a component.

This is an independent Anderson reference. Manufacturer names identify the equipment and do not imply affiliation or authorized-dealer status.

A reference listing does not establish current stock, a price, eligibility for manufacturer support or that a component is faulty.