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Product Detailed Parameters
- Description：DUAL JK FF W/PST; COMMON CLOCK/C
- Series：*
- Mfr：Rochester Electronics, LLC
- Package：Bulk
- Function：-
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- Output Type：-
- Number of Elements：-
- Number of Bits per Element：-
- Clock Frequency：-
- Max Propagation Delay @ V, Max CL：-
- Trigger Type：-
- Current - Output High, Low：-
- Voltage - Supply：-
- Current - Quiescent (Iq)：-
- Operating Temperature：-
- Mounting Type：-
- Supplier Device Package：-
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- Input Capacitance：-
- Grade：-
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Overview
The SN54H78J/B is a military-grade, high-speed TTL shift register manufactured by Rochester Electronics. It features a quad D-type flip-flop configuration with independent clock inputs and clear functions. The device is housed in a 16-lead ceramic dual in-line package (CDIP-14/CDIP-16 variant depending on specific pinout mapping for the H-series, typically CDIP16 for this function). It operates within the standard military temperature range of -55°C to +125°C. Key electrical characteristics include a propagation delay typical of the 54H series and power dissipation limits defined by the standard TTL family specifications.
Feature Summary
- Military-grade reliability with extended temperature range operation
- Quad D-type flip-flop architecture with individual clock control
- Ceramic dual in-line packaging for harsh environment durability
- Independent clear functionality for each flip-flop stage
Applications
- Military aerospace data storage systems
- Spacecraft telemetry signal processing
- High-reliability industrial control logic
- Defense communication equipment registers
Procurement Notes
Verify the specific revision level and date code upon procurement, as Rochester Electronics sources surplus and discontinued parts. Confirm that the ceramic package integrity meets MIL-SPEC requirements for your application environment. Request detailed test reports or lot traceability documentation if required for quality assurance protocols. Ensure compatibility with existing board layouts regarding pin assignments and thermal management strategies for military-grade components.
Selection Notes
Select this component when military qualification and long-term availability are critical. The 54H series offers faster switching speeds than standard 54LS equivalents but consumes more power. Consider the ceramic package's superior hermeticity compared to plastic variants for environments prone to moisture or radiation. Evaluate system power budgets against the higher current draw inherent to high-speed TTL families.
Part Context
This part belongs to the Texas Instruments SN54Hxx series, now managed by Rochester Electronics after TI's discontinuation of many legacy military lines. The 'J' suffix denotes a ceramic dual in-line package, while '/B' may indicate a specific batch or testing variation. It is a direct replacement for original TI SN54H78J units in retrofitted or maintained defense systems requiring exact functional parity.
Replacement Considerations
Direct substitutes include other SN54H78J variants from authorized distributors. Cross-reference with SN54H78K for leaded ceramic options if available. Verify pin-to-pin compatibility with SN54S78 for speed-matched alternatives, though power consumption will differ significantly. No plastic package equivalents offer equivalent environmental resilience.
