MC145028DW

Encoders, Decoders, Converters Overview

The MC145028DW is a CMOS decoder integrated circuit designed for remote control applications. It operates within a supply voltage range of 4.5 V to 18 V and supports an operating temperature range from -40°C to +85°C. The device interprets nine trinary address digits, enabling 19,683 unique codes, or 512 codes using binary data. It features a Valid Transmission (VT) output that activates upon receiving two consecutive matching address sequences. The component utilizes an internal RC oscillator configuration without requiring a crystal.

Encoders, Decoders, Converters Feature Summary

• Supports high-capacity addressing with nine trinary input lines allowing nearly twenty thousand distinct codes
• Includes internal power-on reset mechanism to initialize all outputs to a low state
• Compatible with RF, ultrasonic, and infrared modulation systems

Encoders, Decoders, Converters Applications

• Remote control receiver units
• Security system receivers
• Wireless switch interfaces

Encoders, Decoders, Converters Procurement Notes

Verify the specific manufacturer origin as the part was originally produced by Motorola and later Freescale before NXP acquisition. Confirm RoHS compliance status as older production runs may not meet current environmental standards. Ensure the SOIC package dimensions match the required PCB footprint.

Encoders, Decoders, Converters Selection Notes

Select this decoder when a large number of addresses are required compared to the five-line alternative. Verify that the application uses trinary inputs on the encoder side to utilize the full code capacity. Ensure the supply voltage remains above 4.5 V for proper operation.

Encoders, Decoders, Converters Part Context

This component belongs to the MC145026/27/28 family of CMOS encoder and decoder pairs. While the MC145026 serves as the transmitter and the MC145027 decodes five address bits plus four data bits, the MC145028 focuses exclusively on decoding nine address bits without providing separate data outputs.

Encoders, Decoders, Converters Replacement Considerations

SC41344 is the low-voltage variant of this decoder, supporting 2.8 V to 10 V. Direct replacement requires verifying voltage compatibility.