Texas Instruments CD74HCT125M96

Overview

CD74HCT125M96 from Texas Instruments is a quadruple 3-state buffer IC used for digital signal routing and bus isolation in logic systems. It features four independent non-inverting buffers (Y = A), LSTTL- and CMOS-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2 V), 4.5–5.5 V supply operation, and –55°C to +125°C temperature range - enabling use in industrial control backplanes and aerospace data buses.

For engineers reviewing the CD74HCT125M96 datasheet, CD74HCT125M96 pinout, CD74HCT125M96 application, or CD74HCT125M96 equivalent, key selection criteria include 3-state output timing (tpd = 31 ns typ at 5 V), low quiescent current (ICC = 8 µA typ), high fanout capability (10 LSTTL loads), and SOIC-14 package compatibility with automated SMT assembly.

Technical Context

This device implements four independent positive-logic buffers with active-low 3-state enable inputs (OE), supporting bidirectional bus control without inversion. Each channel operates with balanced CMOS outputs capable of sourcing/sinking ±4 mA while maintaining VOH ≥ 3.98 V and VOL ≤ 0.33 V at 4.5 V supply.

The input structure includes TTL-compatible thresholds and clamp diodes for ESD protection (±2000 V HBM), while thermal design relies on RθJA = 138.7°C/W (SOIC-14) and junction-to-board resistance of 94.7°C/W - critical for sustained operation in thermally constrained embedded modules.

Key Specifications

Pinout & Package

CD74HCT125M96 is packaged in a 14-pin SOIC (D package), 8.65 mm × 6 mm body size, with gull-wing leads and RoHS-compliant NiPdAu/Sn lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/85% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT125DR and 74ACT125SCX, CD74HCT125M96 uniquely balances extended temperature operation, low ICC, and proven reliability in safety-critical systems - making it preferred for aerospace, defense, and industrial control designs where qualification traceability and long-term supply stability are mandatory.

Availability

CD74HCT125M96 is available at Aetrix Electronics and suitable for industrial bus isolation, automotive sensor interface, aerospace data multiplexing, and test equipment signal gating requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HCT125M96 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 logic solutions with over 90 years of innovation in high-reliability components.

CD74HCT125M96 belongs to TI's HCT logic family - engineered for mixed-voltage system interfacing and ruggedized operation in harsh environments including automotive, aerospace, and industrial automation.

FAQ

What is the maximum capacitive load the CD74HCT125M96 can drive while maintaining specified timing?

The CD74HCT125M96 is characterized for CL ≤ 70 pF in timing specifications, with switching characteristics guaranteed at 15 pF (tpd = 10 ns typ) and 50 pF (tpd = 31 ns typ). Driving loads beyond 70 pF increases propagation delay nonlinearly and may violate VOL/VOH specs under heavy current conditions - external series termination is recommended for larger loads. The CD74HCT125M96 datasheet specifies this limit in Section 8.2.2.

Does the CD74HCT125M96 support mixed-voltage operation between 3.3 V and 5 V logic domains?

No - the CD74HCT125M96 requires a single 4.5–5.5 V VCC supply and is not designed for mixed-voltage translation. Its inputs accept 3.3 V logic levels (VIH min = 2 V), but outputs swing rail-to-rail at 5 V, so direct interfacing with 3.3 V receivers requires external level-shifting or series resistors. The CD74HCT125M96 does not implement dual-supply or voltage-tolerant I/O architecture.

How should unused inputs and outputs be handled on the CD74HCT125M96?

Unused inputs must be terminated to VCC or GND using pull-up/pull-down resistors (10 kΩ typical) to prevent floating states that cause excessive ICC and potential oscillation. Unused outputs may be left unconnected (floating) since they enter high-impedance state when OE is HIGH - but must never be tied directly to VCC or GND. This guidance is explicitly stated in Section 8.2.1.2 and 8.2.1.3 of the CD74HCT125M96 datasheet.

Is the CD74HCT125M96 pin-compatible with older CD74HCT125 variants in SOIC-14 packages?

Yes - CD74HCT125M96 shares identical pinout, electrical behavior, and SOIC-14 mechanical footprint with all CD74HCT125 variants in the D package (e.g., CD74HCT125M, CD74HCT125M96E4), including functional equivalence per the CDx4HCT125 family datasheet SCHS415A. Pin numbering, terminal functions, and thermal pad absence are consistent across these orderable part numbers.

What is the meaning of the "M96" suffix in CD74HCT125M96?

The "M96" suffix denotes Texas Instruments' standard SOIC-14 packaging with tape-and-reel delivery (2500 units per reel), RoHS compliance, and Level-1 moisture sensitivity rating. It distinguishes this variant from tube-packaged versions (e.g., CD74HCT125E) and obsolete variants (e.g., CD74HCT125M), confirming current production status and SMT assembly readiness. This coding is defined in TI's Packaging Information addendum for CD74HCT125M96.