Texas Instruments SN74F112D

Overview

SN74F112D from Texas Instruments is a dual negative-edge-triggered J-K flip-flop with independent preset and clear inputs, operating at 5 V supply, supporting up to 100 MHz clock frequency, with 4.5 ns minimum setup time and 0 ns hold time, used in synchronous logic control circuits for industrial counters and state machines.

For engineers reviewing the SN74F112D datasheet, SN74F112D pinout, SN74F112D application, or SN74F112D equivalent, this page delivers verified functional identity, SOIC-16 package mapping, timing-critical design parameters, and validated alternative options for legacy TTL logic replacement.

Technical Context

The SN74F112D implements two fully independent J-K flip-flops, each triggered on the falling edge of CLK, with asynchronous active-low PRE and CLR inputs that override clocked operation. Each flip-flop supports toggle mode when J=K=HIGH and retains state when both J and K are LOW.

It operates strictly within the F-series TTL family: compatible with 5 V ±10% supply, exhibits typical propagation delays of 4.6 ns (tPLH/tPHL), and meets standard TTL input thresholds (VIH ≥2 V, VIL ≤0.8 V) and output drive capability (IOL = 20 mA, IOH = –1 mA).

Key Specifications

Pinout & Package

SN74F112D is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package, 3.9 mm wide, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) Level-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74F112D, SN74LS112N trades speed for broader legacy compatibility, while SN74HC112DR shifts to CMOS advantages at the cost of TTL interface fidelity-neither is pin-compatible, and both require schematic and timing validation for substitution.

Availability

SN74F112D is available at Aetrix Electronics and suitable for industrial counter modules, digital test equipment sequencers, and legacy system repair boards requiring stable component supply across long-lifecycle deployments.

Supply support for SN74F112D 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 logic ICs with global manufacturing and quality certification.

The SN74F112D belongs to TI's 74F TTL logic product line, engineered for high-speed commercial-grade digital control applications where robust noise margins and predictable propagation delays are essential.

FAQ

Is SN74F112D functionally identical to SN74F112N?

Yes, SN74F112D and SN74F112N share identical logic functionality, timing specifications, and DC electrical characteristics. The difference lies solely in packaging: SN74F112D uses SOIC-16, while SN74F112N uses PDIP-16. Both operate over 0°C to 70°C and meet the same F-series TTL performance standards.

Can SN74F112D be used in place of SN74LS112?

No-SN74F112D is not a direct replacement for SN74LS112 due to differing speed grades, input current requirements, and propagation delays. While both are dual J-K flip-flops, SN74F112D has faster timing (100 MHz vs. 45 MHz) and higher drive strength, which may cause timing violations or excessive loading in LS-designed circuits.

What is the meaning of "negative-edge-triggered" in SN74F112D?

"Negative-edge-triggered" means the SN74F112D samples and transfers J/K input data to its outputs only on the falling (high-to-low) transition of the clock signal. This behavior is defined by internal circuit topology and is independent of clock rise/fall time-triggering occurs at a specific voltage threshold during the descent.

Does SN74F112D support 3.3 V operation?

No, SN74F112D is specified only for 4.5 V to 5.5 V operation. Its input thresholds, output voltage levels, and internal TTL circuitry are designed for 5 V nominal systems. Operating at 3.3 V will result in undefined logic states, insufficient noise margins, and potential failure to meet timing or drive specifications.

How does the toggle mode work in SN74F112D?

In SN74F112D, toggle mode is activated when both J and K inputs are held HIGH. On each negative clock edge, the Q output switches state (HIGH ↔ LOW). This behavior is intrinsic to the J-K flip-flop architecture and requires no external feedback-making SN74F112D ideal for simple frequency division or binary counting stages.