NXP Semiconductors MC145027DWR2

Overview

MC145027DWR2 from ON Semiconductor (formerly Motorola) is a CMOS 5-bit trinary address / 4-bit binary data decoder IC for remote control encoder/decoder systems. It operates from 4.5 V to 18 V, supports up to 243 trinary addresses or 32 binary addresses, validates transmission via dual-word match logic, and drives four parallel data outputs (D6–D9) with VT active-high valid transmission flag. Used in infrared, RF, and ultrasonic remote control receivers.

For engineers reviewing the MC145027DWR2 datasheet, MC145027DWR2 pinout, MC145027DWR2 application, or MC145027DWR2 equivalent, key selection considerations include its 4.5–18 V supply range, trinary/binary address encoding compatibility, internal RC timing network interface (R1/C1, R2/C2), VT output behavior requiring consecutive matching words, and SOG-16 (DW) package footprint.

Technical Context

The MC145027DWR2 implements a serial bit-synchronous decoder architecture that samples Din against internally generated timing thresholds derived from external R1/C1 and R2/C2 networks. It uses a 9-bit shift register to capture incoming serial data, extracts the first five trinary digits as address and next four bits as binary data, and requires two consecutive identical words to assert VT.

Its validation logic enforces strict timing: VT goes high only after both address matches *and* data nibble equality are confirmed across two successive words within one encoding sequence; VT remains asserted until mismatch or four-data-period silence occurs. The device includes internal power-on reset forcing all outputs low at startup.

Key Specifications

Pinout & Package

SOG-16 package (Case 751G, DW suffix), 3.9 mm × 9.9 mm body, gull-wing leads, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar remote control decoder applications.

Compared with SC41343DW and MC145028DW, the MC145027DWR2 uniquely balances wide supply range (4.5–18 V), integrated 4-bit data decoding, and robust dual-word validation - making it optimal for legacy remote systems where voltage headroom and command payload coexist.

Availability

MC145027DWR2 is available at Aetrix Electronics and suitable for garage door openers, industrial wireless sensors, consumer audio receivers, and automotive keyless entry systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MC145027DWR2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC145027DWR2 belongs to Motorola's legacy CMOS remote control encoder/decoder family, designed specifically for cost-sensitive, low-power, fixed-code wireless control systems using DIP switches and RC timing - targeting reliability over protocol complexity.

FAQ

What is the supply voltage range for the MC145027DWR2?

The MC145027DWR2 operates from 4.5 V to 18 V DC. This wide range allows direct connection to common unregulated power sources such as 6 V lantern batteries, 9 V transistor radios, and 12 V automotive circuits without external regulators. Operation below 4.5 V is not guaranteed; for lower-voltage systems, consider the SC41343DW variant rated down to 2.8 V.

How does the VT output behave on the MC145027DWR2?

The VT output on the MC145027DWR2 goes high only after two consecutive identical words are received - each containing a matching 5-bit address and identical 4-bit data. VT remains high until either a mismatch occurs or no signal is detected on Din for four full data periods. This dual-word validation prevents false triggering from noise or partial receptions, making VT a reliable enable signal for downstream logic or microcontroller interrupts.

Can the MC145027DWR2 decode binary-only encoders like the MC145026?

Yes, the MC145027DWR2 fully supports binary encoding on its A1–A5 address inputs. When all address pins are strapped to VDD or VSS (no open connections), it interprets them as binary, yielding 32 possible addresses. Data bits D6–D9 remain functional as 4-bit binary outputs. Trinary mode (243 addresses) is enabled by leaving address pins floating (open), but binary mode offers simpler DIP switch implementation and deterministic logic levels.

What external components are required for the MC145027DWR2 to operate?

The MC145027DWR2 requires three external components: a resistor (R1) and capacitor (C1) connected to pins 6 and 7 for pulse-width discrimination, and a second RC network (R2/C2) on pin 10 for word and transmission timing. Typical values depend on the encoder's clock frequency (e.g., R1 = 10 kΩ, C1 = 8.5 nF, R2 = 100 kΩ, C2 = 0.02 µF for ~362 kHz). A 0.1 µF VDD bypass capacitor is also mandatory.

Is the MC145027DWR2 pin-compatible with other devices in the same family?

Yes, the MC145027DWR2 shares identical SOG-16 (DW) pinout with MC145028DW and SC41343DW. All three devices use the same 16-pin layout, allowing board-level substitution where voltage range and feature set align. However, MC145028DW omits D6–D9 outputs and supports 9-bit addressing only, while SC41343DW operates at lower voltage (2.8–10 V) - electrical compatibility must be verified per application.