Texas Instruments SN74ABT125N

Overview

SN74ABT125N from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for high-speed TTL-compatible data routing in industrial control and embedded system backplanes. It delivers −32-mA high-level and 64-mA low-level output drive, supports hot insertion via I_off and power-up 3-state, and operates across −40°C to +85°C with 4.5–5.5-V supply.

For engineers reviewing the SN74ABT125N datasheet, SN74ABT125N pinout, SN74ABT125N application, or SN74ABT125N equivalent, key selection criteria include its 14-pin PDIP package, guaranteed 3-state isolation during power sequencing, ground-bounce immunity (<1 V VOLP), latch-up robustness (>500 mA), and compatibility with legacy 5-V TTL logic families.

Technical Context

The SN74ABT125N implements four independent noninverting buffers, each controlled by a dedicated output-enable (OE) input. Each buffer transitions to high-impedance when its OE is high, enabling bidirectional bus sharing without contention.

Its I_off circuitry actively disables outputs during power-down to prevent backflow current, while power-up 3-state ensures outputs remain tri-stated until V_CC stabilizes-critical for hot-plug systems. Input thresholds are TTL-compatible (V_IL = 0.8 V, V_IH = 2.0 V), and propagation delays are specified at 1–6.5 ns (t_PLH/t_PHL) under 5-V operation.

Key Specifications

Pinout & Package

SN74ABT125N uses a 14-pin plastic dual in-line package (PDIP-N), 0.3-inch body width, with standard through-hole mounting and JEDEC MS-001 compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT244N and SN74LS244N, the SN74ABT125N provides optimal balance of channel density, 5-V TTL compatibility, hot-insertion safety, and sub-5-ns timing-making it the preferred choice for new industrial backplane and embedded expansion designs requiring reliability and performance.

Availability

SN74ABT125N is available at Aetrix Electronics and suitable for industrial backplane buffering, legacy system interface translation, and embedded controller expansion bus applications requiring stable component supply and long-term manufacturing continuity.

Supply support for SN74ABT125N 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 for industrial, automotive, and communications markets.

The SN74ABT125N belongs to TI's ABT logic family-engineered for high-speed, high-drive 5-V TTL-compatible interfacing in mission-critical industrial and telecom infrastructure.

FAQ

What is the maximum output current rating for SN74ABT125N?

The SN74ABT125N supports −32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) per channel under recommended operating conditions. These values ensure robust drive capability for TTL loads and moderate capacitive bus lines, validated across the full −40°C to +85°C temperature range.

Does SN74ABT125N support hot insertion, and how is it implemented?

Yes, SN74ABT125N supports hot insertion via two integrated features: I_off circuitry limits current to ±100 µA when V_CC = 0 V, preventing backflow; and power-up 3-state holds outputs in high-impedance until V_CC reaches valid operating voltage-both confirmed in the SCBS182I datasheet.

What is the propagation delay of SN74ABT125N at 5 V?

At V_CC = 5 V and T_A = 25°C, SN74ABT125N exhibits t_PLH and t_PHL ranging from 1 ns (min) to 4.9 ns (max). This sub-5-ns performance enables reliable operation in high-speed digital buses up to ~200 MHz, as verified in the switching characteristics table of the official datasheet.

Can SN74ABT125N be used with 3.3-V logic systems?

No-SN74ABT125N is strictly a 5-V device with minimum V_CC = 4.5 V and TTL-compatible input thresholds (V_IH = 2.0 V min). It lacks 3.3-V tolerance and will not function reliably with 3.3-V supplies or inputs; use SN74LVC125A instead for 3.3-V applications.

What package type does SN74ABT125N use, and what are its key mechanical dimensions?

SN74ABT125N uses a 14-pin PDIP (plastic dual in-line package) with 0.3-inch body width, 0.1-inch lead pitch, and JEDEC MS-001 compliance. Its height is ≤ 4.57 mm, and it is optimized for through-hole prototyping and legacy industrial PCB assembly.