Texas Instruments SN74ALVC125PWE4

Overview

SN74ALVC125PWE4 from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for 1.65 V to 3.6 V operation in low-voltage digital systems. It provides four independent non-inverting buffers, each with active-low output-enable control, ±24-mA drive strength at 3.3 V, 2.8 ns max propagation delay, and latch-up immunity exceeding 250 mA per JESD 17 - used in bidirectional data bus isolation and level-shifting interfaces.

For engineers reviewing the SN74ALVC125PWE4 datasheet, SN74ALVC125PWE4 pinout, SN74ALVC125PWE4 application, or SN74ALVC125PWE4 equivalent, key selection criteria include 14-pin TSSOP (PW) package compatibility, 3.3-V logic interface timing margins, 3-state bus contention avoidance, and industrial temperature range (-40°C to 85°C) support.

Technical Context

The SN74ALVC125PWE4 implements four identical non-inverting buffer stages, each with dedicated active-low output-enable (OE) control enabling independent 3-state output management. Its CMOS ALVC process ensures rail-to-rail input thresholds scaled to VCC (e.g., VIH = 2.0 V at VCC = 3.0 V), supporting mixed-voltage system interfacing.

Each buffer exhibits matched propagation delay (tpd ≤ 2.8 ns at VCC = 3.3 V), fast enable/disable times (ten/tdis ≤ 3.5 ns), and low quiescent current (ICC ≤ 10 µA). Input and output structures comply with JESD 22 ESD standards (2000-V HBM, 200-V MM, 1000-V CDM), ensuring robustness in automated assembly and field operation.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 5.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, 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 SN74LVC125APW, SN74ALVC125PWE4 delivers guaranteed 2.8 ns timing across its entire 1.65–3.6 V range, while 74AVC125TTR extends voltage coverage downward to 1.2 V and offers faster timing - making SN74ALVC125PWE4 optimal for robust 1.8/2.5/3.3-V interoperability without over-spec'ing.

Availability

SN74ALVC125PWE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive infotainment debug interfaces, and PCIe slot configuration buses requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74ALVC125PWE4 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 high-reliability logic and interface solutions.

The SN74ALVC125PWE4 belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for low-voltage, high-speed bus interface applications in industrial, communications, and computing systems where power efficiency and timing precision are critical.

FAQ

What is the maximum operating frequency supported by SN74ALVC125PWE4?

The SN74ALVC125PWE4 does not specify a maximum clock frequency directly, but its 2.8 ns maximum propagation delay at 3.3 V implies reliable operation up to approximately 350 MHz in short-path, low-load conditions. Actual usable frequency depends on PCB layout, load capacitance, and system timing margins - design validation is required for frequencies above 100 MHz.

Can SN74ALVC125PWE4 operate at 1.8 V and still drive a 50-Ω transmission line?

Yes, SN74ALVC125PWE4 operates down to 1.65 V and delivers ±12 mA output drive at 1.8 V (per electrical characteristics table), sufficient to drive a 50-Ω line to valid logic levels with proper termination. However, slew rate and propagation delay increase at lower VCC - verify timing closure using TI's ALVC IBIS model for 1.8-V simulation.

Is SN74ALVC125PWE4 pin-compatible with SN74LVC125APW?

Yes, SN74ALVC125PWE4 and SN74LVC125APW share identical TSSOP-14 (PW) package dimensions, pinout, and terminal functions. Both feature the same 1OE–1A–1Y–2OE–2A–2Y–GND–VCC–4OE–4A–4Y–3OE–3A–3Y arrangement, enabling drop-in replacement where ALVC's wider voltage range and tighter timing are not required.

How should unused inputs be handled on SN74ALVC125PWE4?

All unused inputs on SN74ALVC125PWE4 must be tied to either VCC or GND - floating CMOS inputs can cause increased ICC, oscillation, or ESD susceptibility. TI recommends connecting unused OE pins to VCC (to disable outputs) and unused A inputs to GND or VCC depending on desired default state, per application report SCBA004.

Does SN74ALVC125PWE4 require external pull-up resistors on OE pins?

External pull-up resistors on OE pins are recommended to ensure high-impedance state during power-up/power-down sequences. TI specifies minimum pull-up value based on driver sink capability - typically 10 kΩ to VCC suffices for most applications, preventing unintended output activation before system initialization completes.