Texas Instruments SN74HC125PWRG4

Overview

SN74HC125PWRG4 from Texas Instruments is a quadruple non-inverting buffer with 3-state outputs, designed for bus interface and signal isolation in digital logic systems. It operates across 2 V to 6 V supply voltage, supports –40°C to +85°C ambient temperature, delivers ≤31 ns propagation delay at 6 V (CL = 50 pF), and sinks/sours up to ±7.8 mA output current. It enables/disables four independent data paths in microcontroller I/O expansion, memory address latching, and bidirectional bus control.

For engineers reviewing the SN74HC125PWRG4 datasheet, SN74HC125PWRG4 pinout, SN74HC125PWRG4 application, or SN74HC125PWRG4 equivalent, key selection criteria include its TSSOP-14 package footprint, active-low 3-state enable architecture per channel, CMOS-compatible input thresholds, low ICC (≤80 µA), and verified compatibility with LSTTL fanout (up to 10 loads).

Technical Context

This device implements four independent positive-logic buffers (Y = A) with individually controlled active-low 3-state outputs. Each channel features standard CMOS inputs with ≤10 pF input capacitance and balanced CMOS 3-state outputs capable of sourcing/sinking ≥6 mA while maintaining VOH ≥ 3.98 V and VOL ≤ 0.33 V at 4.5 V.

It uses silicon-gate CMOS technology for low power consumption (Cpd = 45 pF/gate) and high noise immunity. The functional modes are strictly defined by the OE/A input combination: output follows input when OE = L; output enters high-impedance state when OE = H - no internal pull-ups or Schmitt triggers are present.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm lead pitch, surface-mount, moisture-sensitive level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 3-state buffer applications.

Compared with SN74HCT125PWRE4, SN74HC125PWRG4 offers wider supply flexibility but narrower input threshold compatibility; compared with 74LVC125APW,118, it trades speed and low-voltage support for proven industrial temperature stability and drop-in replacement capability in HC-family designs.

Availability

SN74HC125PWRG4 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, memory address latching, bidirectional data bus control, and logic-level translation applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for SN74HC125PWRG4 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 and embedded processing solutions, with over 50 years of logic IC innovation and manufacturing excellence.

The SN74HC125PWRG4 belongs to TI's industry-standard 74HC logic family, engineered for low-power, high-noise-immunity digital interfacing in industrial, automotive, and communications equipment.

FAQ

What is the maximum capacitive load SN74HC125PWRG4 can drive while meeting datasheet timing specs?

The SN74HC125PWRG4 is characterized for CL ≤ 50 pF in timing specifications (e.g., tpd = 11 ns typ at 6 V). While it can drive up to 70 pF with acceptable degradation, exceeding 50 pF increases propagation delay and transition time - for guaranteed compliance with published specs, keep total load ≤50 pF including trace and input capacitance. The SN74HC125PWRG4 datasheet explicitly recommends this limit in Section 9.2.2.

Can SN74HC125PWRG4 operate reliably at 2.5 V supply voltage?

Yes, SN74HC125PWRG4 is fully specified from 2 V to 6 V. At 2.5 V, it maintains VIH ≥ 1.7 V and VIL ≤ 0.8 V, supports tpd ≤ 180 ns (max), and draws ICC ≤ 80 µA - making it suitable for mixed-signal systems with 2.5 V rails. All electrical characteristics in the SN74HC125PWRG4 datasheet include 2 V and 2.5 V test points under Recommended Operating Conditions.

Is SN74HC125PWRG4 pin-compatible with SN74HC125DR?

Yes, SN74HC125PWRG4 (TSSOP-14) and SN74HC125DR (SOIC-14) share identical pin numbering, function mapping, and logic behavior. Both follow the same 14-pin functional pinout: pins 1/4/10/13 = OE, 2/5/9/12 = A, 3/6/8/11 = Y, 7 = GND, 14 = VCC. Mechanical differences (package size, pitch, thermal resistance) do not affect electrical compatibility or schematic symbol reuse.

Does SN74HC125PWRG4 include internal ESD protection diodes?

Yes, SN74HC125PWRG4 integrates bidirectional clamp diodes on all inputs and outputs, rated for ±2000 V HBM and ±500 V CDM per JEDEC standards. These diodes route transient current to VCC or GND, protecting internal circuitry - but external current limiting remains essential if clamping exceeds ±20 mA (absolute max IIK/IOK).

How should unused inputs and outputs be handled on SN74HC125PWRG4?

Unused inputs on SN74HC125PWRG4 must be terminated to VCC or GND (not left floating) to prevent oscillation and excess current draw; 10-kΩ pull-up/down resistors are recommended. Unused outputs may be left unconnected (floating) since the 3-state design prevents contention - but OE must be held HIGH to ensure high-Z state. This guidance is confirmed in SN74HC125PWRG4 Application Section 9.1 and Layout Section 11.1.