Texas Instruments CD74HC125QM96G4Q1

Overview

CD74HC125QM96G4Q1 from Texas Instruments is an automotive-grade quadruple non-inverting buffer with 3-state outputs, performing Y = A logic per channel. It operates from 2 V to 6 V, supports –40°C to +125°C ambient temperature, delivers ≤26 ns propagation delay at 6 V, and features active-low output enables for bus isolation in digital systems.

For engineers reviewing the CD74HC125QM96G4Q1 datasheet, CD74HC125QM96G4Q1 pinout, CD74HC125QM96G4Q1 application, or CD74HC125QM96G4Q1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, SOIC-14 package compatibility, 3-state output drive capability (±7.8 mA), input transition rate support down to 400 ns/V at 6 V, and thermal resistance of 133.6 °C/W (R_θJA).

Technical Context

This device implements four independent CMOS buffer gates, each with a dedicated active-low 3-state output enable (OE) controlling high-impedance state entry. All inputs are standard CMOS with clamp diodes and ≤10 pF input capacitance, enabling direct interfacing with microcontrollers and FPGAs without level-shifting.

The balanced 3-state outputs provide symmetrical sourcing/sinking capability up to ±7.8 mA at 6 V, while maintaining low off-state leakage (±10 µA) and supporting capacitive loads ≤70 pF. Propagation delay (17–100 ns) and enable/disable timing (21–190 ns) are tightly specified across the full automotive temperature range.

Key Specifications

Pinout & Package

CD74HC125QM96G4Q1 uses a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm with 1.27 mm lead pitch and 1.75 mm max height. The package is RoHS-compliant, moisture-sensitivity Level-1 rated, and optimized for automated surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125AQPWRQ1 and MC74VHC125DT, CD74HC125QM96G4Q1 uniquely combines AEC-Q100 Grade 1 qualification, 6 V maximum supply tolerance, and SOIC-14 packaging-making it the only option qualified for 5 V automotive subsystems requiring extended voltage margin and proven reliability.

Availability

CD74HC125QM96G4Q1 is available at Aetrix Electronics and suitable for automotive body control units, industrial programmable logic controllers, infotainment display interfaces, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC125QM96G4Q1 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 delivering analog and embedded processing solutions for automotive, industrial, personal electronics, and communications markets.

CD74HC125QM96G4Q1 belongs to TI's automotive-qualified HC logic family, designed specifically for robust signal buffering and bus isolation in harsh-environment electronic control units where reliability, temperature resilience, and qualification compliance are mandatory.

FAQ

What is the maximum capacitive load supported by CD74HC125QM96G4Q1?

The CD74HC125QM96G4Q1 is characterized for loads ≤50 pF to meet all datasheet specifications, and operation with loads up to 70 pF is permitted with potential timing degradation. Exceeding 70 pF risks violating propagation delay and transition-time limits; for heavier loads, a series current-limiting resistor must be added per TI application guidance. This constraint applies directly to the CD74HC125QM96G4Q1 in its SOIC-14 package configuration.

Does CD74HC125QM96G4Q1 support 3.3 V logic levels?

Yes, CD74HC125QM96G4Q1 fully supports 3.3 V operation: its recommended V_CC range (2 V to 6 V) includes 3.3 V, and input thresholds (V_IL ≤1.35 V, V_VIH ≥3.15 V at 4.5 V V_CC) scale linearly to ensure reliable recognition of 3.3 V logic levels. The CD74HC125QM96G4Q1 maintains specified t_pd, drive strength, and leakage performance at 3.3 V, making it interoperable with modern microcontrollers and FPGAs.

How should unused inputs on CD74HC125QM96G4Q1 be handled?

Unused inputs on CD74HC125QM96G4Q1 must be terminated to either V_CC or GND to prevent floating states that cause excessive current draw and logic instability. TI recommends direct connection (not pull-up/down resistors) for permanently unused inputs; a 10 kΩ resistor may be used if dynamic control is needed. This requirement applies uniformly across all four channels of the CD74HC125QM96G4Q1 and is critical for automotive-grade reliability.

Is CD74HC125QM96G4Q1 pin-compatible with standard CD74HC125 variants?

Yes, CD74HC125QM96G4Q1 shares identical pinout, function table, and electrical behavior with industry-standard CD74HC125 devices in SOIC-14 packages-including catalog (CD74HC125) and military (CD54HC125) versions. The Q1 suffix denotes AEC-Q100 qualification but does not alter pin assignment or logic functionality, allowing drop-in replacement in existing designs requiring automotive qualification.

What thermal derating applies to CD74HC125QM96G4Q1 at 125°C ambient?

At T_A = 125°C, CD74HC125QM96G4Q1's maximum allowable power dissipation is limited by its R_θJA of 133.6 °C/W: P_D(max) = (T_J(max) – T_A) / R_θJA = (150°C – 125°C) / 133.6 °C/W ≈ 187 mW. This corresponds to continuous operation with ≤2 channels active at full drive, verified using TI's C_pd = 29 pF/gate and typical ICC = 160 µA. Derating is inherent to the CD74HC125QM96G4Q1's SOIC package construction.