Texas Instruments SN74HC125IPWRG4Q1

Overview

SN74HC125IPWRG4Q1 from Texas Instruments is a quadruple non-inverting buffer with 3-state outputs, designed for bus interface and signal enable applications in digital logic systems. It operates across 2 V to 6 V supply voltage, supports –40°C to +85°C ambient temperature, delivers propagation delay as low as 11 ns at 6 V, and drives up to 10 LSTTL loads. It is used in data bus isolation and controlled signal routing in industrial control modules.

For engineers reviewing the SN74HC125IPWRG4Q1 datasheet, SN74HC125IPWRG4Q1 pinout, SN74HC125IPWRG4Q1 application, or SN74HC125IPWRG4Q1 equivalent, key selection criteria include 3-state output timing (enable/disable delays), output drive strength at 4.5 V/6 V, thermal resistance (RθJA = 151.7°C/W), input transition time compliance (≤400 ns at 6 V), and compatibility with CMOS/TTL logic families.

Technical Context

This device implements four independent positive-logic buffers (Y = A) with active-low 3-state enable inputs (OE). Each channel operates with balanced CMOS output drivers capable of sourcing/sinking up to ±7.8 mA at 6 V while maintaining VOH ≥ 5.48 V and VOL ≤ 0.33 V under load.

It uses standard CMOS inputs with ≤10 pF input capacitance and ±1 µA leakage at 6 V, requiring fast input edges (≤400 ns transition time at 6 V) to prevent shoot-through current. The 3-state outputs exhibit ≤5 µA leakage (IOZ) when disabled, enabling high-impedance bus sharing without contention.

Key Specifications

Pinout & Package

TSSOP-14 package (5.00 mm × 4.40 mm body size), 14-pin thin shrink small-outline package with 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 buffer-with-3-state-output applications.

Compared with SN74HC125PW, SN74HC125IPWRG4Q1 adds AEC-Q100 Grade 2 automotive qualification and enhanced traceability for safety-critical systems; versus 74LVC125APW, it offers broader voltage flexibility and proven interoperability with 5 V TTL but trades off speed and drive capability.

Availability

SN74HC125IPWRG4Q1 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical data acquisition systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified assurance.

Supply support for SN74HC125IPWRG4Q1 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 company specializing in analog and embedded processing technologies, with leadership in logic, power management, and signal chain solutions.

The SN74HC125IPWRG4Q1 belongs to TI's HC logic family, engineered for low-power, wide-voltage-operation digital interfacing in industrial and automotive applications where reliability and voltage flexibility are critical.

FAQ

What is the maximum operating temperature for SN74HC125IPWRG4Q1?

The SN74HC125IPWRG4Q1 is rated for an operating free-air temperature range of –40°C to +85°C. This specification is validated per AEC-Q100 Grade 2 requirements and confirmed in the device's Recommended Operating Conditions table. Operation beyond +85°C may cause parametric shift or reliability degradation; junction temperature must remain below 150°C under all conditions per Absolute Maximum Ratings.

Does SN74HC125IPWRG4Q1 support 3.3 V logic levels?

Yes, SN74HC125IPWRG4Q1 fully supports 3.3 V operation. At VCC = 3.3 V, it meets all recommended input thresholds (VIH ≥ 2.31 V, VIL ≤ 0.99 V), delivers VOH ≥ 3.1 V and VOL ≤ 0.35 V at 6 mA load, and maintains propagation delay ≤ 19 ns (typical). Its 2 V–6 V supply range makes it interoperable with both 3.3 V and 5 V logic families without level translation.

What is the purpose of the 3-state outputs in SN74HC125IPWRG4Q1?

The 3-state outputs in SN74HC125IPWRG4Q1 allow each buffer channel to electrically disconnect from the driven line when its corresponding OE pin is HIGH. This enables multiple devices to share a common bus without signal contention. When disabled, output leakage remains ≤5 µA, preserving bus voltage integrity - a core requirement in multi-master digital systems like industrial fieldbuses or modular test equipment.

Can unused inputs on SN74HC125IPWRG4Q1 be left floating?

No, unused inputs on SN74HC125IPWRG4Q1 must not be left floating. Standard CMOS inputs have high impedance and undefined voltage states when unconnected, risking oscillation, excessive current draw, or latch-up. Per TI's layout guidelines, all unused A and OE inputs must be tied to VCC or GND using direct connections or ≤10 kΩ pull resistors to ensure stable logic states and reliable operation.

What decoupling capacitor value is recommended for SN74HC125IPWRG4Q1?

A 0.1 µF ceramic capacitor is recommended for SN74HC125IPWRG4Q1, placed as close as possible to the VCC and GND pins. This value effectively suppresses high-frequency switching noise generated during output transitions. For enhanced noise immunity in noisy environments, TI recommends paralleling the 0.1 µF cap with a 1 µF capacitor - both must be physically adjacent to the device to minimize loop inductance and ensure stable supply rail integrity.