Texas Instruments SNJ54F109W

Overview

SNJ54F109W from Texas Instruments is a dual J-K positive-edge-triggered flip-flop with independent clear (CLR) and preset (PRE) inputs, operating across –55°C to 125°C. It features 16-pin CFP packaging, 100 MHz max clock frequency (SN54F109), 2.5 V min VOH at –1 mA, 0.3 V max VOL at 20 mA, and supports toggle and D-type configurations via J/K pin tying. It is used in military-grade synchronous logic control and state-machine sequencing.

For engineers reviewing the SNJ54F109W datasheet, SNJ54F109W pinout, SNJ54F109W application, or SNJ54F109W equivalent, this page delivers verified timing parameters, military-temperature operation limits, CFP package mechanical data, functional truth table behavior, and direct alternatives for high-reliability digital design validation.

Technical Context

This device implements two independent edge-triggered storage elements with asynchronous active-low preset and clear. Each flip-flop responds to the rising edge of CLK while PRE/CLR override all clocked behavior when asserted low.

Its logic function includes setup time (3 ns), hold time (1 ns), propagation delays (tPLH/tPHL ≤ 9 ns), and guaranteed switching up to 100 MHz under VCC = 5 V and TA = 25°C - with full characterization over –55°C to 125°C per MIL-PRF-38535.

Key Specifications

Pinout & Package

SNJ54F109W uses a 16-pin Ceramic Flatpack (CFP) package with gull-wing leads, hermetically sealed for high-reliability environments. Pin 1 orientation follows quadrant Q1 per TI tape-and-reel specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SNJ54F109W, SNJ54F109J offers identical functionality in a through-hole DIP for ease of validation, while SNJ54F109FK provides enhanced thermal dissipation and hermetic sealing in a surface-mount LCCC - neither is pin-compatible, requiring PCB redesign for substitution.

Availability

SNJ54F109W is available at Aetrix Electronics and suitable for avionics flight control, secure communications, radar timing, and hardened industrial PLC applications requiring stable component supply across extended temperature ranges and long lifecycle support.

Supply support for SNJ54F109W 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 aerospace, defense, and industrial markets.

The SN54F109 family was designed specifically for military-grade digital control systems requiring guaranteed operation from –55°C to 125°C, with strict adherence to MIL-PRF-38535 screening and traceability standards.

FAQ

What is the maximum clock frequency supported by SNJ54F109W?

The SNJ54F109W supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). At temperature extremes across –55°C to 125°C, the guaranteed minimum operating frequency remains 0 Hz, with timing parameters derated per the datasheet's switching characteristics table. This makes SNJ54F109W suitable for both high-speed sequencing and low-frequency fail-safe logic in mission-critical systems.

Does SNJ54F109W support true toggle mode operation?

Yes, SNJ54F109W supports true toggle mode: tie K low and J high, then apply clock edges - each CLK↑ will invert the output state. This behavior is explicitly confirmed in the device description and function table. The SNJ54F109W maintains this capability across its full military temperature range, with no additional external components required beyond pull-up/pull-down resistors for unused inputs.

What package type is used for SNJ54F109W and what are its key mechanical features?

SNJ54F109W uses a 16-pin Ceramic Flatpack (CFP) package with gull-wing leads, hermetically sealed for moisture and particle resistance. Its dimensions are defined in TI's packaging addendum: 26.16 mm width, 506.98 mm tube length, and 6220 µm height. The CFP construction provides superior thermal stability and reliability in high-vibration, high-radiation environments where plastic packages are unsuitable.

How does the asynchronous clear (CLR) function behave in SNJ54F109W?

In SNJ54F109W, the asynchronous clear (CLR) input operates independently per flip-flop and forces Q = L and Q̅ = H immediately upon going low - regardless of clock state or J/K levels. This override behavior is valid across the full –55°C to 125°C range and requires no setup/hold time relative to CLK. The SNJ54F109W datasheet confirms that CLR assertion takes precedence over all synchronous operations, making it ideal for emergency shutdown or initialization circuits.

Is SNJ54F109W RoHS compliant?

No, SNJ54F109W is not RoHS compliant. Per TI's Packaging Addendum, the part uses SNPB (tin-lead) lead finish and carries "No" in the RoHS column. It is intended for high-reliability military, aerospace, and legacy industrial applications where leaded finishes are mandated for solder joint integrity and thermal fatigue resistance under extreme environmental stress.