Texas Instruments SN74ALVC125PWRG4

Overview

SN74ALVC125PWRG4 from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It provides four independent non-inverting buffers, each with an active-low output-enable control, ±24-mA drive capability at 3.3 V, 2.8-ns max propagation delay, and latch-up performance exceeding 250 mA per JESD 17 - used in level-shifting and bidirectional bus isolation in low-voltage digital systems.

For engineers reviewing the SN74ALVC125PWRG4 datasheet, SN74ALVC125PWRG4 pinout, SN74ALVC125PWRG4 application, or SN74ALVC125PWRG4 equivalent, key selection criteria include 3-state output timing (t_pd, t_en, t_dis), supply voltage range compatibility (1.65–3.6 V), output drive strength (±24 mA @ 3.3 V), thermal impedance (θ_JA = 113 °C/W), and TSSOP-14 package footprint constraints.

Technical Context

The SN74ALVC125PWRG4 implements four identical non-inverting buffer channels, each with a dedicated active-low output-enable (OE) input controlling high-impedance state entry/exit. Its CMOS ALVC logic family ensures rail-to-rail input thresholds scaled to V_CC (e.g., V_IL = 0.35×V_CC at 1.65 V; V_IH = 2.0 V at 3.0–3.6 V) and supports mixed-voltage interfacing across 1.8-V, 2.5-V, and 3.3-V domains.

Each channel operates with matched enable/disable timing (t_en ≤ 3.5 ns, t_dis ≤ 4.0 ns at 3.3 V), low quiescent current (I_CC = 10 µA max), and robust ESD protection (2000-V HBM, 200-V MM, 1000-V CDM). The device requires no external pull-up on OE for power-up high-impedance safety if tied to V_CC via resistor ≥10 kΩ.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125APWR, SN74ALVC125PWRG4 delivers faster timing and guaranteed 1.65-V operation; versus 74AUP1G125GW,125, it offers quad integration and higher drive but occupies larger area - trade-offs center on channel density, speed, and minimum supply voltage.

Availability

SN74ALVC125PWRG4 is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive infotainment subsystems, and medical imaging data paths requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74ALVC125PWRG4 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency across industrial, automotive, and personal electronics markets.

The SN74ALVC125PWRG4 belongs to TI's ALVC logic family, engineered for high-speed, low-voltage bus interfacing in mixed-signal systems where timing predictability, noise immunity, and wide supply tolerance are critical.

FAQ

What is the minimum V_CC required for reliable operation of SN74ALVC125PWRG4?

The SN74ALVC125PWRG4 is fully specified down to 1.65 V, with guaranteed functionality including input threshold tracking (V_IL = 0.35×V_CC, V_IH = 0.65×V_CC) and output drive (±4 mA) at that voltage. Operation below 1.65 V is not characterized and may result in undefined logic states or increased propagation delay.

Can SN74ALVC125PWRG4 be used as a level shifter between 1.8-V and 3.3-V logic domains?

Yes - the SN74ALVC125PWRG4 supports 1.65–3.6 V V_CC, and its inputs are overvoltage tolerant up to 4.6 V. When powered at 3.3 V, it safely accepts 1.8-V inputs and outputs clean 3.3-V logic levels; when powered at 1.8 V, it converts 3.3-V inputs (clamped by internal diodes) to 1.8-V outputs, provided current limits are observed.

What is the recommended pull-up resistor value for OE pins on SN74ALVC125PWRG4 during power-up?

Texas Instruments recommends tying OE pins to V_CC through a pull-up resistor ≥10 kΩ to ensure high-impedance state at power-up. This value balances current consumption (<330 µA at 3.3 V) against noise immunity and rise time; values up to 100 kΩ remain effective in low-noise environments.

Does SN74ALVC125PWRG4 require external decoupling capacitors, and where should they be placed?

Yes - a 0.1-µF ceramic decoupling capacitor must be placed between V_CC (Pin 14) and GND (Pin 7) within 5 mm of the SN74ALVC125PWRG4 package. Additional bulk capacitance (e.g., 4.7 µF tantalum) is advised near the power entry point for systems with multiple ICs sharing the same rail.

How does the thermal performance of SN74ALVC125PWRG4 compare across different packages?

The SN74ALVC125PWRG4 in TSSOP-14 (PW) has θ_JA = 113 °C/W. In comparison, the SOIC-14 (D) version is 86 °C/W and TVSOP-14 (DGV) is 127 °C/W. For continuous 100-mW dissipation, the PW package yields ~11.3°C junction rise above ambient - acceptable in most PCB layouts with moderate copper area.