Texas Instruments SN74LV125ATPWE4

Overview

SN74LV125ATPWE4 from Texas Instruments is a quadruple 3-state bus buffer gate used for bidirectional data isolation and bus driving in digital logic systems. It operates from 4.5 V to 5.5 V, delivers typical propagation delay of 3.8 ns at 5 V, supports TTL-voltage-compatible inputs, and features Ioff partial-power-down protection. It is commonly deployed in industrial control backplanes and mixed-voltage interface bridging.

For engineers reviewing the SN74LV125ATPWE4 datasheet, SN74LV125ATPWE4 pinout, SN74LV125ATPWE4 application, or SN74LV125ATPWE4 equivalent, key selection criteria include 3-state output timing (tpd ≤ 5.5 ns), Ioff leakage (< 5 µA), ground bounce performance (VOLP < 0.8 V), and compatibility with 5-V TTL input thresholds.

Technical Context

The SN74LV125ATPWE4 implements four independent non-inverting buffers, each with active-low 3-state output enable (OE). Each channel operates as a voltage-level translator supporting mixed-mode operation across ports - inputs tolerate TTL logic levels while outputs swing rail-to-rail within VCC.

Its Ioff circuitry actively disables all outputs during power-down, limiting off-state current to ≤5 µA and preventing backflow damage. The device meets JESD17 latch-up immunity (>250 mA) and JEDEC HBM ESD rating (±2000 V), enabling robust use in noisy industrial environments.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 5.00 mm × 6.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed thermal pad optional per design.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV125ATPWE4, SN74LVC125APWR offers broader voltage flexibility and speed but sacrifices Ioff safety, while 74ACT125MTCX provides superior drive and speed in SOIC only - making SN74LV125ATPWE4 optimal for new designs requiring partial-power-down compliance and TSSOP footprint.

Availability

SN74LV125ATPWE4 is available at Aetrix Electronics and suitable for industrial control backplanes, automotive diagnostic hubs, legacy system bus isolation, and programmable logic expansion requiring stable component supply and extended temperature operation.

Supply support for SN74LV125ATPWE4 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 connectivity technologies, with decades of experience in industrial-grade logic and interface solutions.

The SN74LV125ATPWE4 belongs to TI's LV family of low-voltage, high-speed logic ICs designed specifically for robust 5-V digital interfacing in harsh environments - emphasizing noise immunity, power-down safety, and wide temperature operation.

FAQ

What is the maximum recommended operating voltage for SN74LV125ATPWE4?

The absolute maximum VCC rating for SN74LV125ATPWE4 is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V per TI's SCES629B datasheet. Operating outside this window risks parametric degradation, increased static current (ICC), or reduced noise margins - especially above 5.5 V where VOH may exceed safe logic-high thresholds for downstream receivers.

Does SN74LV125ATPWE4 support hot-swap or partial-power-down operation?

Yes, SN74LV125ATPWE4 includes Ioff circuitry that limits input/output leakage to ≤5 µA when VCC = 0 V, enabling safe hot-swap and partial-power-down use. This feature prevents damaging back-current flow from live I/O lines into a powered-down device - a requirement verified in TI's electrical characteristics table (Ioff parameter, Section 5.5).

What is the typical propagation delay of SN74LV125ATPWE4 under standard load conditions?

SN74LV125ATPWE4 exhibits a typical propagation delay (tpd) of 3.8 ns at VCC = 5 V with CL = 15 pF, as specified in Section 5.6 of the SCES629B datasheet. At CL = 50 pF, tpd increases to 5.3 ns typical - confirming its suitability for high-speed bus applications up to ~100 MHz with appropriate layout and termination.

Can SN74LV125ATPWE4 interface directly with 3.3-V logic devices?

Yes, SN74LV125ATPWE4 supports mixed-mode voltage operation: its inputs accept 3.3-V logic levels (VIH = 2 V min), and its outputs swing rail-to-rail (0–VCC), so a 3.3-V receiver sees valid logic levels when VCC = 5 V. However, outputs driving 3.3-V inputs require external clamping or series resistance to avoid overvoltage - confirmed in TI's "Mixed-Mode Voltage Operation" feature description.

What package type does SN74LV125ATPWE4 use, and what are its key mechanical dimensions?

SN74LV125ATPWE4 uses the TSSOP-14 (PW) package: 5.00 mm × 6.4 mm body size, 0.65 mm lead pitch, 1.2 mm maximum height, and gull-wing leads. Mechanical drawings in TI's SCES629B document (PW0014A outline) confirm pin 1 index area location and land pattern requirements for reliable reflow soldering.