Texas Instruments CD74HC73MT

Overview

CD74HC73MT from Texas Instruments is a dual J-K flip-flop with asynchronous reset, negative-edge clock triggering, complementary Q/Q̅ outputs, and buffered inputs - operating across 2 V to 6 V supply range. It delivers 60 MHz maximum clock frequency at 5 V/15 pF, supports –55°C to +125°C industrial/military temperature range, and drives up to 10 LSTTL loads. Used in synchronous logic control, state machines, and clock division circuits within embedded timing subsystems.

For engineers reviewing the CD74HC73MT datasheet, CD74HC73MT pinout, CD74HC73MT application, or CD74HC73MT equivalent, this page provides verified functional identity, SOIC-14 package mapping, propagation delay (tPLH/tPHL = 13 ns @ 5 V/15 pF), noise-immune hysteresis on clock inputs, and confirmed HC-family CMOS logic compatibility - all validated against TI's SCHS134G datasheet revision G (October 2022).

Technical Context

The CD74HC73MT implements two independent edge-triggered J-K flip-flops sharing no internal coupling - each with dedicated J, K, CLK, and active-low asynchronous reset (R̅) inputs plus Q and Q̅ outputs. Its silicon-gate CMOS process enables LSTTL-equivalent speed with standard CMOS power efficiency.

It features hysteresis on clock inputs for enhanced noise immunity and extended input rise/fall times, balanced propagation delays (tPLH ≈ tPHL), and fanout capability of 10 LSTTL loads over full temperature range. The device is functionally identical to HC107 but differs in pin assignment and parametric limits.

Key Specifications

Pinout & Package

CD74HC73MT is housed in a 14-pin SOIC (D) package with nominal body size 8.65 mm × 3.90 mm and maximum height 1.75 mm. Pin 1 is located at the top-left corner with notch or beveled edge marking orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual J-K flip-flop applications.

Compared with CD74HC73MT, CD74HC107M96 adds functional complexity at the cost of higher static current, while SN74HC73DR provides identical timing and logic behavior with current production status and enhanced assembly reliability - making it the preferred upgrade path for new designs.

Availability

CD74HC73MT is available at Aetrix Electronics and suitable for industrial control logic, digital signal timing, test equipment sequencing, and military data acquisition requiring stable component supply across extended temperature ranges.

Supply support for CD74HC73MT 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 ICs with decades of high-reliability product heritage.

The CD74HC73MT belongs to TI's HC-series CMOS logic portfolio, designed for applications demanding low power, wide voltage operation, and robust performance across extreme temperatures - especially in industrial automation and defense systems.

FAQ

What is the supply voltage range supported by CD74HC73MT?

CD74HC73MT operates from 2 V to 6 V DC, enabling interoperability with both 3.3 V and 5 V logic systems. This wide range allows direct integration into mixed-voltage designs without level-shifting circuitry. The device maintains specified timing and drive strength across the full range, with typical fMAX = 60 MHz achievable only at 5 V with 15 pF load. At 2 V, maximum clock frequency drops to 4 MHz per datasheet Section 5.5.

Does CD74HC73MT support asynchronous reset, and how is it implemented?

Yes, CD74HC73MT features two independent active-low asynchronous reset inputs (1R̅ and 2R̅), one per flip-flop. When asserted LOW, each R̅ forces its corresponding Q output to LOW immediately - irrespective of clock or J/K input states. This behavior is defined in the truth table (Section 7.3) and enables deterministic initialization without clock dependency, essential for safety-critical or fault-recovery logic.

What is the maximum clock frequency for CD74HC73MT, and under what conditions is it achieved?

The maximum clock frequency for CD74HC73MT is 60 MHz, measured at VCC = 5 V with CL = 15 pF and TA = 25°C (Section 5.5). Under heavier loading (CL = 50 pF), fMAX reduces to 35 MHz at 6 V and 20 MHz at 4.5 V. The device does not guarantee 60 MHz operation outside these exact conditions - design margins must account for temperature extremes, supply variation, and PCB trace capacitance.

Is CD74HC73MT pin-compatible with CD74HCT73 variants?

No, CD74HC73MT is not pin-compatible with CD74HCT73 variants despite identical pin numbering and package. The HCT version uses TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max), whereas HC requires CMOS thresholds (VIH = 3.15 V at 4.5 V). Interchanging them risks logic misinterpretation - especially with marginal drive levels - and violates recommended operating conditions per Section 5.2.

What package type and dimensions does CD74HC73MT use?

CD74HC73MT uses a 14-pin SOIC (D) package with nominal dimensions 8.65 mm × 3.90 mm and maximum height 1.75 mm (Package Outline D0014A). It follows JEDEC MS-012AB standard, features gull-wing leads, and is rated for surface-mount reflow per MSL Level-1 (unlimited floor life). Pin 1 is identified by a beveled corner or notch on the top edge.