MC145027DWR2

Encoders, Decoders, Converters Overview

The MC145027DWR2 is a CMOS decoder integrated circuit manufactured by NXP USA Inc., designed for use in remote control applications. It operates within a supply voltage range of 4.5V to 18V and features a 16-SOIC surface-mount package with a width of 7.50mm. The device interprets five trinary address digits, allowing for 243 unique addresses, while processing four bits of binary data. It includes an internal power-on reset that forces all outputs low upon initialization.

Encoders, Decoders, Converters Feature Summary

• Validates transmission integrity by requiring two consecutive matching address words before activating the Valid Transmission output.
• Supports trinary encoding states (low, high, open) for address inputs to maximize code combinations.
• Features an active-low transmit enable input with an internal pull-up device for simplified interface design.

Encoders, Decoders, Converters Applications

• Remote control systems utilizing RF, ultrasonic, or infrared modulation.
• Wireless sensor networks requiring secure address-based communication.
• Industrial automation controllers using serial data decoding.

Encoders, Decoders, Converters Procurement Notes

Verify component authenticity through official manufacturer channels due to discontinued status. Confirm RoHS compliance requirements as the datasheet indicates non-compliance. Check for moisture sensitivity level 2 classification and ensure proper storage conditions are maintained prior to assembly.

Encoders, Decoders, Converters Selection Notes

Select this decoder when paired with the MC145026 encoder for systems requiring five-bit trinary addressing. Ensure the application voltage remains between 4.5V and 18V. Consider the SC41343 variant if operation below 4.5V is required, noting its specific low-voltage characteristics.

Encoders, Decoders, Converters Part Context

Part of the MC145026/27/28 family of CMOS encoder-decoder pairs originally developed by Motorola. The DWR2 suffix denotes a tape-and-reel packaging format suitable for automated surface-mount assembly processes. This series is widely recognized for low standby current and robust noise immunity in consumer electronics.

Encoders, Decoders, Converters Replacement Considerations

SC41343 is a verified low-voltage replacement operating from 2.8V to 10V. Direct pin-compatible alternatives may include other MC145027 variants with different suffixes indicating package type changes, provided voltage ratings align with system requirements.

Encoders, Decoders, Converters FAQ

How does the MC145027 handle invalid transmissions?

The Valid Transmission (VT) output remains low if a mismatch occurs in either the address or data bits during the two-word sequence. VT also disables if no signal is received for four data periods.

What is the function of the R1 and C1 pins?

Pins R1 and C1 accept external resistor and capacitor components to set the time constant for pulse discrimination, determining whether a received pulse is interpreted as a logic high or low.

Can the MC145027 decode binary data exclusively?

Yes, while it supports trinary addressing, the four data bits must be binary (logic 0 or 1). A trinary open state on the encoder's data lines is decoded as a logic high by the receiver.