onsemi SN74LS367AN

Overview

SN74LS367AN from Texas Instruments is a hex buffer/line driver with three-state outputs, designed for bus-oriented applications in TTL logic systems. It features 6 independent non-inverting buffers, each with separate output-enable control (1OE, 2OE), operates at 0–70°C, supports 5V supply, and delivers typical propagation delay of 15 ns at V_CC = 5V.

For engineers reviewing the SN74LS367AN datasheet, pinout, applications, or equivalent options, this device is selected for bidirectional data bus isolation, address/data latching in legacy microprocessor systems, and noise-immune signal buffering where low-power TTL compatibility and output disable capability are required.

Technical Context

The SN74LS367AN implements dual 3-bit non-inverting buffer sections, each controlled by its own active-low output-enable input (1OE, 2OE). All six outputs enter high-impedance state when their respective OE is high, enabling shared-bus operation without contention.

It uses standard LS-TTL circuitry with Schottky-clamped transistors to achieve improved speed over standard TTL while maintaining compatible voltage thresholds (V_IH = 2.0 V min, V_IL = 0.8 V max) and drive strength (I_OH = –15 mA, I_OL = 24 mA at V_CC = 5V).

Key Specifications

Pinout & Package

SN74LS367AN is supplied in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and standard through-hole footprint. Pin spacing is 0.1 inch (2.54 mm), compatible with industry-standard IC sockets and PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex buffer with three-state output applications.

Compared with SN74LS244N and SN74LS368N, the SN74LS367AN uniquely provides non-inverting 6-bit buffering in a 16-pin PDIP with dual OE control-making it irreplaceable in legacy designs requiring exact signal polarity and compact footprint.

Availability

SN74LS367AN is available at Aetrix Electronics and suitable for industrial control retrofitting, legacy test equipment repair, and aerospace maintenance interface development requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74LS367AN 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 with over 90 years of analog and logic IC innovation, serving industrial, automotive, and communications markets.

The SN74LS367AN belongs to TI's classic 74LS logic family, engineered specifically for backward compatibility, deterministic timing, and robust operation in mission-critical legacy digital systems.

FAQ

What is the maximum clock frequency supported by SN74LS367AN?

The SN74LS367AN is not a clocked device-it has no internal clock and functions as a combinational buffer. Its usable signal frequency depends on propagation delay (15 ns typical) and system trace length. In practice, it reliably handles digital edges up to ~30 MHz in well-terminated, short-trace environments, but is typically deployed in asynchronous bus applications like address latching rather than high-speed clock distribution.

Does SN74LS367AN support mixed-voltage operation (e.g., 3.3 V inputs)?

No. SN74LS367AN is strictly a 5 V LS-TTL device. Its input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and output levels (V_OL ≤ 0.5 V, V_OH ≥ 2.7 V) are specified only for V_CC = 4.75–5.25 V. Applying 3.3 V logic directly risks marginal switching or failure to recognize HIGH inputs; level translation is required for interfacing with 3.3 V systems.

Can SN74LS367AN be used as a line receiver in noisy industrial environments?

Yes-its LS-TTL input structure provides inherent noise immunity with 0.4 V guaranteed noise margin (V_IH – V_IL). When combined with proper PCB layout (ground plane, short traces, local decoupling), the SN74LS367AN effectively rejects common-mode noise up to ±400 mV, making it suitable for factory-floor I/O expansion where EMI is present.

Is there a surface-mount version of SN74LS367AN with identical functionality?

Yes-SN74LS367ADR (SOIC-16) and SN74LS367ANSR (SOP-16) offer identical logic functionality, timing, and DC specs. Both are RoHS-compliant, operate over 0–70°C, and share the same pinout as SN74LS367AN. The SOP variant (NS) has slightly larger pad pitch (1.27 mm vs. 2.54 mm), requiring layout adaptation but enabling higher-density assembly.

How does the three-state behavior of SN74LS367AN prevent bus contention?

When either 1OE or 2OE is driven HIGH, the corresponding three outputs (Y1–Y3 or Y4–Y6) enter high-impedance (Hi-Z) state-effectively disconnecting them from the bus. This allows multiple SN74LS367AN devices (or other three-state drivers) to share the same physical bus lines without electrical conflict, provided only one device has its OE asserted LOW at any time-a fundamental requirement for safe bus arbitration in legacy computing architectures.