Texas Instruments SN74LS107ADRG4

Overview

SN74LS107ADRG4 from Texas Instruments is a dual negative-edge-triggered J-K flip-flop with individual asynchronous clear inputs, fabricated in LS-TTL logic, operating at 0°C to 70°C, with typical propagation delay of 15 ns and maximum power dissipation of 50 mW per flip-flop, used in synchronous counter and state-machine control circuits.

For engineers reviewing the SN74LS107ADRG4 datasheet, SN74LS107ADRG4 pinout, SN74LS107ADRG4 application, or SN74LS107ADRG4 equivalent, this device supports discrete logic sequencing, clock-domain synchronization, and legacy TTL system upgrades where edge-triggered bistable operation with independent reset is required.

Technical Context

The SN74LS107ADRG4 implements two independent J-K flip-flops sharing no internal logic-each has dedicated J, K, clock (CLK), and active-low clear (/CLR) terminals. It uses bipolar transistor-transistor logic (TTL) with Schottky clamping for speed and noise immunity.

Operation is strictly negative-edge-triggered on CLK; both outputs (Q and /Q) change only on the falling edge of CLK when /CLR is high. Asynchronous /CLR overrides clock action and forces Q low regardless of J/K states.

Key Specifications

Pinout & Package

SN74LS107ADRG4 is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, 3.9 mm wide, 8.65 mm long, 1.75 mm max height, RoHS-compliant with NiPdAu lead finish and moisture sensitivity 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 SN74LS112DR and SN74HC107DR, the SN74LS107ADRG4 delivers guaranteed negative-edge response, LS-TTL voltage compatibility, and minimal propagation delay-making it optimal for retrofitting or maintaining legacy 5-V synchronous logic where timing precision and interface fidelity are non-negotiable.

Availability

SN74LS107ADRG4 is available at Aetrix Electronics and suitable for industrial control panels, test equipment counters, legacy instrumentation upgrades, and educational logic labs requiring stable component supply across long production lifecycles.

Supply support for SN74LS107ADRG4 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 solutions with broad industrial and automotive qualification.

The SN74LS107ADRG4 belongs to TI's legacy 74LS logic family, designed specifically for robust, low-power, pin-compatible upgrades of original 7400-series TTL in commercial-grade digital systems.

FAQ

What logic family does SN74LS107ADRG4 belong to, and how does it differ from standard TTL?

SN74LS107ADRG4 belongs to the low-power Schottky (LS) TTL family. It differs from standard TTL (e.g., SN74107) by incorporating Schottky diodes to prevent transistor saturation, reducing propagation delay to 15 ns and cutting power consumption by ~50%. Its input thresholds and output drive remain fully compatible with other 74LS devices, enabling seamless integration into existing LS-based designs without redesign.

Does SN74LS107ADRG4 support master-slave or edge-triggered operation?

SN74LS107ADRG4 implements true negative-edge-triggered operation-not master-slave. State changes occur only on the falling edge of CLK, with setup and hold times referenced to that edge. There is no internal master latch; the device evaluates J and K inputs synchronously at the clock transition, providing deterministic behavior ideal for counters and finite-state machines.

Can SN74LS107ADRG4 operate with a 3.3-V supply?

No, SN74LS107ADRG4 requires a 4.75–5.25 V supply and is not specified for 3.3-V operation. Its input thresholds and output voltage levels are optimized for 5-V TTL logic families. Attempting 3.3-V operation results in undefined logic states, excessive propagation delay, and potential output contention. For 3.3-V systems, consider SN74LVC109 or similar CMOS alternatives.

Is SN74LS107ADRG4 pin-compatible with SN74107 or SN74LS107AN?

Yes, SN74LS107ADRG4 shares identical pinout and electrical specifications with SN74107 and SN74LS107AN. All are 14-pin dual J-K flip-flops with /CLR, J, K, CLK, Q, and /Q arranged identically. The 'D' suffix denotes SOIC packaging, while 'N' is PDIP-but functionally and electrically, SN74LS107ADRG4 is a direct replacement for both in commercial-temperature applications.

What is the maximum clock frequency supported by SN74LS107ADRG4?

SN74LS107ADRG4 does not specify a maximum clock frequency in its datasheet, but its 15 ns maximum propagation delay implies reliable operation up to approximately 33 MHz in ideal conditions. Real-world limits depend on setup/hold timing margins, load capacitance, and PCB routing; for stable 20-MHz counting, ensure CLK rise/fall times <5 ns and keep trace lengths short and terminated if necessary.