Texas Instruments SNJ54107J

Overview

SNJ54107J from Texas Instruments is a dual J-K flip-flop with individual asynchronous clear inputs, fabricated in bipolar TTL technology, operating across -55°C to +125°C, with propagation delay of 25 ns (max) at VCC = 5 V, and compatible with standard 14-pin CDIP (J) package for military-grade logic control in timing-critical aerospace sequencers.

For engineers reviewing the SNJ54107J datasheet, SNJ54107J pinout, SNJ54107J application, or SNJ54107J equivalent, this device serves as a radiation-tolerant, high-reliability edge-triggered storage element in synchronous state machines, clock dividers, and reset-synchronized counters where extended temperature range and deterministic setup/hold timing are mandatory.

Technical Context

The SNJ54107J implements two independent negative-edge-triggered J-K flip-flops, each with active-low asynchronous clear (CLR̅), no preset input, and direct Q and Q̅ outputs. It uses standard TTL-compatible input thresholds and drives standard TTL loads.

Its logic behavior follows the classical J-K truth table: when J=K=1, it toggles on each falling clock edge; when J=1,K=0, it sets Q=1; when J=0,K=1, it resets Q=0; and when J=K=0, Q holds its state. Setup time is 10 ns, hold time is 5 ns, and minimum clock pulse width is 20 ns.

Key Specifications

Pinout & Package

Ceramic Dual In-line Package (CDIP), 14-pin, hermetically sealed with glass frit lid (J package), 5.08 mm max height, 0.100" lead pitch, RoHS-exempt due to SNPB finish, MSL N/A (non-moisture-sensitive).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual J-K flip-flop applications.

Compared with SN54107J and SN74LS107AN, SNJ54107J uniquely combines military-grade temperature range, hermetic packaging, and full MIL-PRF-38535 Class B compliance - making it the only option qualified for flight hardware where failure modes must be bounded by screening and process controls.

Availability

SNJ54107J is available at Aetrix Electronics and suitable for aerospace sequencers, satellite command decoders, avionics power-up sequencers, and military radar pulse generators requiring stable component supply across extended temperature ranges and long lifecycle support.

Supply support for SNJ54107J 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

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

SNJ54107J belongs to TI's legacy military logic family designed for deterministic, radiation-tolerant digital control in mission-critical systems where parameter stability over extreme temperature and long-term reliability outweigh power efficiency concerns.

FAQ

What is the maximum clock frequency supported by SNJ54107J?

The SNJ54107J does not specify a maximum clock frequency in its datasheet; instead, it guarantees timing via minimum pulse width and propagation delay. With a minimum clock pulse width of 20 ns and t_PLH/t_PHL ≤ 25 ns, reliable operation is ensured up to approximately 20 MHz in well-designed layouts. The SNJ54107J performance depends on maintaining specified setup (10 ns) and hold (5 ns) times relative to the falling clock edge.

Does SNJ54107J include preset functionality?

No, the SNJ54107J provides only asynchronous clear (CLR̅) inputs for each flip-flop and no preset (PRE̅) terminals. Its functional description explicitly defines "DUAL J-K FLIP-FLOPS WITH CLEAR" - meaning set functionality is achieved solely via J/K logic (J=1,K=0) on the next clock edge, not through a dedicated preset pin. This distinguishes it from variants like SN74LS112 which include both PRE̅ and CLR̅.

Is SNJ54107J RoHS compliant?

No, SNJ54107J is RoHS-exempt due to its leaded (SNPB) finish and ceramic DIP (J) package, as confirmed in TI's Packaging Information document. It complies with MIL-PRF-38535 requirements for high-reliability military applications, where lead-free alternatives are not qualified for extended temperature or hermetic sealing performance.

Can SNJ54107J be used in place of SN74LS107A in commercial designs?

While functionally identical at the logic level, SNJ54107J is not recommended for commercial designs due to its higher cost, extended temperature range (-55°C to +125°C), and SNPB finish - features unnecessary for 0°C to +70°C applications. The SNJ54107J also requires different handling (no moisture sensitivity, but strict ESD and cleanliness protocols). Use SN74LS107AN or SN74LS107AD instead for commercial use.

What is the significance of the 'J' suffix in SNJ54107J?

The 'J' suffix in SNJ54107J denotes the Ceramic Dual In-line Package (CDIP) variant per TI's standard part numbering convention. It distinguishes this hermetically sealed, military-grade version from plastic-packaged variants (e.g., 'N' for PDIP, 'D' for SOIC). The 'J' package ensures mechanical robustness, thermal stability, and long-term reliability in harsh environments where SNJ54107J is deployed.