54LS147J/B

Overview

The SN54LS147J/B is a 10-line to 4-line priority encoder manufactured by Rochester Electronics. It belongs to the TTL/H/L series and features negative logic inputs and outputs, encoding nine data lines into four-line (8-4-2-1) BCD code. The device operates over the full military temperature range of -55°C to +125°C. It utilizes a CDIP14 ceramic DIP package with 14 terminals. Inputs are buffered to represent one normalized Series 54/74 load.

Feature Summary

• Encodes nine active-low data inputs into four active-low BCD outputs
• Implied decimal zero condition requires no input activation
• Buffered inputs ensure compatibility with standard TTL loads

Applications

• Military-grade digital encoding systems
• BCD conversion in harsh environment electronics
• Priority interrupt handling circuits

Procurement Notes

Verify component authenticity through official manufacturer documentation or authorized distributor channels. Confirm that the part meets MIL-PRF-38535 Class Q specifications if required for your application. Ensure the package type matches your PCB footprint requirements. Check for any specific testing protocols mandated by your quality assurance standards before integration.

Selection Notes

Select this component when military-grade reliability and wide temperature operation are required. It is suitable for applications needing direct BCD output from multiple input lines without external decoding logic. Consider the CDIP14 package constraints during mechanical design. Verify power supply voltage levels align with standard TTL requirements.

Part Context

This part is part of the SN54LS147 family, which includes variants like SN54147 and SN54LS148. It is designed for high-reliability applications where performance must be maintained across extreme temperature variations. The 'J' suffix typically denotes a specific package variant within the military grade lineup.

Replacement Considerations

SN54147J/B offers similar functionality but may differ in speed characteristics. SN54LS148 provides octal encoding instead of BCD. SN74LS147 is available for commercial temperature ranges only. Verify pinout compatibility and electrical specifications before substitution.