Texas Instruments SN74S112AN3

Overview

SN74S112AN from Texas Instruments is a dual J-K negative-edge-triggered flip-flop in a 16-pin PDIP package, operating from 4.75 V to 5.25 V with typical propagation delay of 4 ns (CLK to Q), maximum clock frequency of 125 MHz, and guaranteed operation across 0°C to 70°C ambient temperature - used in synchronous logic control, state machines, and digital counters.

For engineers reviewing the SN74S112AN datasheet, SN74S112AN pinout, SN74S112AN application, or SN74S112AN equivalent, this page delivers verified functional identity, validated timing parameters, confirmed package mapping, real-world use cases, and technically grounded alternative options for industrial and test equipment design.

Technical Context

The SN74S112AN implements two independent J-K flip-flops with separate preset (PR̅) and clear (CLR̅) inputs, each triggered on the falling edge of the clock (CLK). It uses TTL-compatible Schottky-clamped transistor logic for high-speed switching and noise immunity.

Each flip-flop supports asynchronous active-low preset and clear, synchronous data capture via J/K inputs, and complementary Q and Q̅ outputs. The device requires no external pull-ups and interfaces directly with standard 74S-series logic families.

Key Specifications

Pinout & Package

SN74S112AN is housed in a 16-pin plastic dual in-line package (PDIP-N), 0.300-inch wide body, with 0.100-inch lead pitch and through-hole mounting compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS112AN and SN74HC112N, SN74S112AN uniquely delivers 74S-speed performance in a through-hole package while maintaining full pin and functional compatibility with military-grade 54S112 variants - making it the only choice for retrofitting high-speed legacy test gear.

Availability

SN74S112AN is available at Aetrix Electronics and suitable for test instrumentation, industrial control panels, and benchtop electronics requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74S112AN 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 global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74S112AN belongs to TI's legacy 74S logic family, engineered for high-speed digital control in military, aerospace, and precision test equipment where reliability and timing predictability are critical.

FAQ

What is the maximum operating frequency of the SN74S112AN?

The SN74S112AN supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This specification is measured at the CLK input and reflects guaranteed timing performance across the commercial temperature range (0°C to 70°C). The SN74S112AN achieves this speed via Schottky-clamped bipolar transistors, distinguishing it from slower 74LS or CMOS alternatives. Always verify timing margins with worst-case propagation delays in your specific layout.

Does the SN74S112AN support asynchronous reset and preset?

Yes, the SN74S112AN provides fully asynchronous active-low preset (PR̅) and clear (CLR̅) inputs for each flip-flop. These inputs override clock and J/K states immediately - setting Q = 1 or Q = 0 regardless of CLK edge timing. This behavior is electrically verified per TI's 74S112A datasheet and enables fast system initialization or fault recovery in real-time control applications using SN74S112AN.

Is the SN74S112AN pin-compatible with other 74xx112 devices?

The SN74S112AN shares identical pinout and terminal functions with SN74LS112AN, SN74HC112N, and military-grade SNJ54S112J - all use 16-pin PDIP with matching J, K, CLK, PR̅, CLR̅, Q, and Q̅ assignments. However, electrical compatibility requires verification: SN74S112AN drives heavier loads and switches faster than LS/HC versions, so direct substitution may affect timing or fanout in mixed-family designs.

What is the recommended power supply decoupling for SN74S112AN?

TI specifies a 0.1 µF ceramic capacitor placed as close as possible (<1 cm) between VCC (pin 16) and GND (pin 8) for each SN74S112AN unit. This minimizes high-frequency supply noise generated during rapid output transitions. For boards with multiple SN74S112AN devices, add a bulk 10 µF tantalum capacitor near the power entry point. These values are validated in TI's 74S logic application notes and ensure stable operation up to 125 MHz in the SN74S112AN.

Can SN74S112AN operate outside the 0°C to 70°C range?

No - the SN74S112AN is rated exclusively for 0°C to 70°C ambient operation. Its internal Schottky TTL circuitry is characterized and guaranteed only within this commercial temperature range. For extended temperature applications (e.g., –55°C to 125°C), TI offers military-grade variants like SNJ54S112J (CDIP) or SNJ54S112W (CFP), which share identical logic functionality but undergo additional screening and qualification per MIL-PRF-38535. The SN74S112AN itself is not tested or warranted beyond its specified range.