Texas Instruments SN74LV125ATPWR

Overview

SN74LV125ATPWR from Texas Instruments is a quadruple 3-state bus buffer gate IC used for bidirectional data isolation and bus driving in digital logic systems. It operates from 4.5 V to 5.5 V, delivers 3.8 ns typical propagation delay 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 SN74LV125ATPWR datasheet, SN74LV125ATPWR pinout, SN74LV125ATPWR application, or SN74LV125ATPWR equivalent, key selection criteria include 3-state output timing (tpd ≤ 5.5 ns), Ioff leakage < 5 µA at 5.5 V, thermal resistance (RθJA = 113 °C/W in TSSOP), and compatibility with 5-V logic families in space-constrained PCB layouts.

Technical Context

The SN74LV125ATPWR implements four independent non-inverting buffers, each with active-low 3-state output enable (OE). Each channel drives high-impedance (Z) when OE is high, and passes A→Y when OE is low - per function table confirmed across –40°C to 125°C.

It uses LV-CMOS process technology with TTL-input thresholds (VIH = 2 V, VIL = 0.8 V), supports mixed-mode voltage operation on all ports, and includes Ioff circuitry that disables outputs and limits power-off leakage to ≤5 µA, enabling safe hot-insertion in powered-backplane systems.

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, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV125ATPWR, SN74LVC125APWR offers lower voltage operation but lacks TTL compatibility and Ioff, while 74ACT125PW delivers superior speed and drive strength but sacrifices partial-power-down capability and increases static power consumption.

Availability

SN74LV125ATPWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, automotive body control modules, and programmable logic interposers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LV125ATPWR 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 solutions, with decades of experience in high-reliability logic and interface ICs.

The SN74LV125ATPWR belongs to TI's LV family of 5-V tolerant CMOS logic devices, engineered for robust performance in industrial, automotive, and communications infrastructure where mixed-voltage interoperability and power-down safety are essential.

FAQ

What is the maximum operating temperature for the SN74LV125ATPWR?

The SN74LV125ATPWR is rated for continuous operation from –40°C to +125°C ambient temperature. This specification is validated per JEDEC JESD78 and applies to all package variants including the TSSOP-14 (PW) variant SN74LV125ATPWR. Thermal derating begins above 85°C based on RθJA = 113 °C/W and maximum junction temperature of 150°C.

Does the SN74LV125ATPWR support hot-swap operation?

Yes, the SN74LV125ATPWR supports hot-swap operation via its Ioff feature. When VCC = 0 V, the Ioff circuitry limits input/output leakage current to ≤5 µA across 0–5.5 V, preventing damaging backflow current. This enables safe insertion/removal in live backplane systems - provided OE pins are pulled high during power-up via external resistors.

Can the SN74LV125ATPWR interface directly with 3.3-V logic inputs?

Yes, the SN74LV125ATPWR accepts 3.3-V logic inputs reliably: its VIH threshold is 2.0 V (min) and VIL is 0.8 V (max) over 4.5–5.5 V VCC, making it compatible with standard 3.3-V CMOS/TTL output levels. However, outputs swing rail-to-rail (0–5.5 V), so downstream 3.3-V receivers require voltage translation or tolerance.

What is the recommended decoupling for the SN74LV125ATPWR?

TI recommends a 0.1-µF X7R ceramic capacitor placed within 5 mm of the SN74LV125ATPWR VCC (pin 14) and GND (pin 7) pins. For systems with high di/dt switching, add a 4.7-µF bulk capacitor nearby. The capacitor must be rated for ≥6.3 V and mounted with short, low-inductance traces to minimize supply noise and ground bounce (VOLP < 0.8 V).

Is the SN74LV125ATPWR pin-compatible with other 14-pin bus buffers?

The SN74LV125ATPWR shares identical pinout and function mapping with industry-standard 74LV125, 74LVC125, and 74ACT125 in TSSOP-14 (PW) packages - including OE/A/Y assignments and power/ground locations. However, electrical differences (e.g., Ioff presence, VCC range, drive strength) require validation before drop-in replacement in existing designs.