Texas Instruments SN74LS367AD

Overview

SN74LS367AD from Texas Instruments is a dual 4-bit non-inverting buffer/driver with 3-state outputs, designed for bus-oriented applications in TTL-compatible digital systems. It features two independent enable controls (1G and 2G), 16-pin SOIC packaging, operating temperature range of 0°C to 70°C, and typical propagation delay of 15 ns at V_CC = 5 V. It is used in data bus isolation and address buffering in legacy industrial controllers.

For engineers reviewing the SN74LS367AD datasheet, SN74LS367AD pinout, SN74LS367AD application, or SN74LS367AD equivalent, key selection criteria include 3-state output control timing, DC drive capability (24 mA sink / 15 mA source), input compatibility with LS-TTL and standard TTL logic families, and SOIC-16 thermal and layout constraints.

Technical Context

The SN74LS367AD implements six non-inverting buffer gates grouped as two 4-bit sections (1A–1D and 2A–2D), each controlled by a dedicated active-high output-enable input (1G and 2G). All outputs enter high-impedance state when their respective G input is low.

It uses bipolar Schottky TTL technology, ensuring compatibility with LS-TTL input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and delivering guaranteed output voltages (V_OL ≤ 0.5 V at I_OL = 24 mA, V_OH ≥ 2.7 V at I_OH = –15 mA) across its rated supply (4.75 V to 5.25 V).

Key Specifications

Pinout & Package

SN74LS367AD is supplied in a 16-pin Small Outline Integrated Circuit (SOIC) package (Package Code D), 7.5 mm wide, with 1.27 mm pitch and gull-wing leads. The package is RoHS-compliant with NiPdAu lead finish and moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buffer/driver applications.

Compared with SN74LS244N and SN74LS367AN, the SN74LS367AD offers surface-mount compatibility and independent dual-enable control-critical for time-multiplexed bus architectures-while retaining full LS-TTL electrical interoperability and timing predictability.

Availability

SN74LS367AD is available at Aetrix Electronics and suitable for industrial control retrofitting, legacy test equipment maintenance, and commercial-grade embedded system upgrades requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74LS367AD 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 ICs, with decades of heritage in TTL and LS-TTL product development.

The SN74LS367AD belongs to TI's legacy 74LS logic family, engineered for robustness, predictable timing, and interoperability in fixed-function digital systems deployed in industrial, instrumentation, and computing infrastructure.

FAQ

What is the maximum clock frequency supported by SN74LS367AD?

The SN74LS367AD is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate depends on propagation delay (15 ns max) and system setup/hold timing. In practice, it reliably supports data valid windows up to ~30 MHz in well-terminated 5 V TTL buses, assuming clean edges and minimal skew. The SN74LS367AD does not impose a clock limit but constrains maximum toggle rate via t_PD and output transition time.

Can SN74LS367AD drive LEDs directly?

Yes, the SN74LS367AD can drive LEDs directly in sink configuration: connect LED anode to +5 V and cathode to any 1Y or 2Y output. With V_OL ≤ 0.5 V at 24 mA, it safely sources up to 15 mA (for anode-to-output) or sinks up to 24 mA (for cathode-to-output). For a typical 2 V, 10 mA LED, use a 300 Ω series resistor. Always verify power dissipation (≤ 100 mW per output) and total package limit (≤ 500 mW) in multi-LED configurations.

Is SN74LS367AD pin-compatible with SN74LS244?

No, SN74LS367AD is not pin-compatible with SN74LS244. While both are 16-pin SOIC buffers, SN74LS244 uses pins 1/2/3/4/5/6/7/8 for inputs and 11/12/13/14/15/16/17/18 for outputs (requiring 20-pin package), whereas SN74LS367AD uses 16-pin SOIC with interleaved I/O (e.g., 1A=pin 2, 1Y1=pin 3). The SN74LS367AD pinout matches SN74LS367AN (PDIP) and differs fundamentally from SN74LS244's octal layout.

Does SN74LS367AD support hot insertion or live insertion?

No, SN74LS367AD does not support hot insertion. It lacks power-up/down protection circuitry, bus-hold, or I²C-style slew-rate control. Applying V_CC while inputs or outputs are biased risks latch-up or excessive current draw. Always power the SN74LS367AD before applying signals, and ensure G inputs are held inactive (low) during power ramp. For hot-swap applications, consider purpose-built hot-swap controllers or buffers with Ioff protection.

What is the recommended bypass capacitor for SN74LS367AD?

A 0.1 µF ceramic capacitor placed as close as possible to the V_CC (pin 16) and GND (pin 8) pins is mandatory for stable SN74LS367AD operation. This minimizes high-frequency supply noise induced by simultaneous output switching. For boards with multiple SN74LS367AD devices, add one 0.1 µF cap per IC plus a bulk 4.7 µF–10 µF electrolytic/tantalum capacitor per 5–10 ICs near the power entry point. Avoid long traces between cap and pins-keep loop area under 2 mm².