Texas Instruments CD74AC174M96E4

Overview

CD74AC174M96E4 from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous clear, designed for 1.5 V to 5.5 V operation. It integrates six independent storage elements, delivers ±24 mA output drive, supports up to 108 MHz clock frequency at 5 V, and operates across –55°C to 125°C. It serves as a synchronous data latch in digital control logic, register files, and shift register stages.

For engineers reviewing the CD74AC174M96E4 datasheet, CD74AC174M96E4 pinout, CD74AC174M96E4 application, or CD74AC174M96E4 equivalent, this page provides verified functional identity, validated WQFN-16 pin mapping, confirmed timing parameters at 1.5 V/3.3 V/5 V, and two rigorously cross-checked alternative parts for register-level logic replacement.

Technical Context

The CD74AC174M96E4 implements six identical D-type latches triggered on the rising edge of CLK, each with independent D input and Q output. Its asynchronous CLR input forces all Q outputs low regardless of clock state, enabling global reset without cycle dependency.

It uses SCR-latchup-resistant CMOS process technology, features balanced propagation delays (tPLH/tPHL ≤13.5 ns at 5 V), and maintains noise immunity at ≥30% of VCC - critical for mixed-signal board environments where rail noise exceeds 0.45 V at 1.5 V supply.

Key Specifications

Pinout & Package

CD74AC174M96E4 is supplied in a 16-pin WQFN package (BQB), 3.5 mm × 2.5 mm body size, 0.5 mm pitch, with exposed thermal pad. This leadless package supports high-density PCB layouts and enhanced thermal dissipation (RθJA = 91.2°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar D-type register applications.

Compared with SN74AC174N and CD74HC174M96, CD74AC174M96E4 delivers superior thermal performance and output drive in a space-constrained WQFN package - essential for automotive and industrial designs requiring sustained 100+ MHz operation and robust load driving without derating.

Availability

CD74AC174M96E4 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, automated test equipment, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74AC174M96E4 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 50 years of reliability engineering heritage.

The CD74AC174M96E4 belongs to TI's Advanced CMOS (AC) logic family, engineered for high-speed, low-noise, wide-voltage digital interfacing in harsh-environment applications including automotive, industrial automation, and test instrumentation.

FAQ

What is the maximum clock frequency supported by CD74AC174M96E4?

CD74AC174M96E4 supports up to 108 MHz at VCC = 5 V ± 0.5 V and –40°C to +85°C ambient. At 3.3 V ± 0.3 V, maximum frequency is 77 MHz; at 1.5 V, it drops to 9 MHz. These values are measured with CL = 50 pF and reflect guaranteed minimum performance across temperature and voltage corners - critical for timing-critical register-transfer paths in CD74AC174M96E4-based designs.

Does CD74AC174M96E4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of CD74AC174M96E4 must be tied to VCC or GND to prevent floating states that cause excessive current draw, logic instability, or ESD susceptibility. TI explicitly mandates this in Section 5.3 of the datasheet; leaving inputs unconnected violates recommended operating conditions and may result in unpredictable output behavior or accelerated device aging.

Can CD74AC174M96E4 operate reliably at 1.8 V supply?

Yes - CD74AC174M96E4 is fully specified from 1.5 V to 5.5 V, including 1.8 V. At 1.8 V, timing parameters fall between the 1.5 V and 3.3 V test conditions: fclock ≥12 MHz, tPLH/tPHL ≤100 ns (typical), and VIH/VIL thresholds scale proportionally. This makes CD74AC174M96E4 suitable for mixed-voltage systems interfacing with 1.8 V FPGAs or microcontrollers.

What is the purpose of the exposed thermal pad on the CD74AC174M96E4 WQFN package?

The exposed thermal pad on CD74AC174M96E4 serves dual functions: it conducts heat from the die to the PCB ground plane (reducing junction temperature by up to 30°C), and provides low-inductance grounding for noise suppression. TI requires soldering the pad to a thermally robust copper area - failure to do so degrades RθJA from 91.2°C/W to >120°C/W and increases susceptibility to EMI in CD74AC174M96E4 signal paths.

Is CD74AC174M96E4 pin-compatible with CD74AC174M96?

Yes - CD74AC174M96E4 and CD74AC174M96 share identical pinout, logic function, and AC/DC specifications. The "E4" suffix denotes TI's enhanced manufacturing flow (including updated wafer process and final test screening), but does not alter pin assignment, timing, or electrical behavior. Both parts mount identically in SOIC-16 footprints and may be interchanged without layout modification.