Texas Instruments CD74HCT00MG4

Overview

CD74HCT00MG4 from Texas Instruments is a quadruple 2-input NAND gate IC with TTL-compatible CMOS inputs, operating from 4.5 V to 5.5 V, supporting –55°C to +125°C temperature range, delivering 4 mA output drive at VOH ≥ 3.98 V and VOL ≤ 0.4 V, and used in tamper-detect circuits and S-R latch implementations.

For engineers reviewing the CD74HCT00MG4 datasheet, CD74HCT00MG4 pinout, CD74HCT00MG4 application, or CD74HCT00MG4 equivalent, key selection considerations include its LSTTL-compatible input thresholds (VIL(max) = 0.8 V, VIH(min) = 2 V), buffered inputs, fanout capability of 10 LSTTL loads, low ICC quiescent current (≤40 µA), and SOIC-14 package compatibility with industrial and aerospace-grade thermal performance.

Technical Context

This device implements four independent positive-logic NAND gates (Y = A ● B), each with balanced CMOS push-pull outputs capable of sourcing and sinking up to 4 mA while maintaining VOH ≥ 3.98 V and VOL ≤ 0.4 V at VCC = 4.5 V. Input structure includes clamp diodes and TTL-compatible thresholds for direct interfacing with legacy LSTTL logic.

It features buffered inputs to reduce capacitive loading effects and supports fast switching with tpd = 20–30 ns (CL = 50 pF) and tt = 15–22 ns, while requiring strict adherence to input transition time limits (≤400–500 ns) to prevent oscillation and excessive power draw in high-impedance CMOS input stages.

Key Specifications

Pinout & Package

CD74HCT00MG4 is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 3.90 mm, with gull-wing leads, RoHS-compliant NiPdAu finish, and moisture sensitivity level (MSL) Level-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NAND gate applications.

Compared with SN74HCT00DR and MC74HCT00ADG, CD74HCT00MG4 provides verified operation across –55°C to +125°C, tighter VOH/VOL specifications at temperature extremes, and MSL-1 reflow compatibility - making it the preferred choice for mission-critical, thermally demanding deployments where long-term reliability trumps unit cost.

Availability

CD74HCT00MG4 is available at Aetrix Electronics and suitable for alarm/tamper detect circuits, S-R latch implementations, industrial control interfaces, aerospace signal conditioning, and redundant logic modules requiring stable component supply across extended temperature ranges.

Supply support for CD74HCT00MG4 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 headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and communications markets.

CD74HCT00MG4 belongs to TI's HCT logic family - engineered for TTL-to-CMOS translation in mixed-voltage systems, emphasizing interoperability, low static power, and rugged operation across harsh environmental conditions.

FAQ

What is the maximum operating temperature range supported by CD74HCT00MG4?

CD74HCT00MG4 is specified to operate from –55°C to +125°C, meeting extended temperature requirements for aerospace, defense, and under-hood automotive applications. This rating is verified per the manufacturer's test conditions in the SCHS398 datasheet and applies specifically to the CD74HCT00MG4 variant in SOIC-14 packaging.

Can CD74HCT00MG4 directly interface with 74LS-series logic outputs?

Yes, CD74HCT00MG4 features TTL-compatible inputs with VIL(max) = 0.8 V and VIH(min) = 2 V, allowing direct connection to 74LS-series outputs without external pull-up resistors or level shifters. Its input structure is explicitly designed for seamless integration with legacy LSTTL logic families.

What is the recommended bypass capacitor for CD74HCT00MG4?

A 0.1 µF ceramic capacitor is recommended for CD74HCT00MG4, placed physically and electrically close to the VCC and GND pins. This minimizes high-frequency supply noise and prevents output instability during switching transitions, as confirmed in Section 10 and Figure 11-1 of the official datasheet.

Is it safe to leave unused inputs of CD74HCT00MG4 floating?

No - unused inputs of CD74HCT00MG4 must never be left floating. The datasheet mandates termination to either VCC or GND to prevent undefined logic states, increased power consumption, and potential oscillation. A 10-kΩ pull-up or pull-down resistor is recommended if dynamic control is required.

Does CD74HCT00MG4 support parallel connection of outputs for higher drive strength?

Yes, CD74HCT00MG4 allows paralleling of outputs from two gates with identical inputs to increase effective drive strength - for example, connecting 1Y and 2Y together when 1A=2A and 1B=2B. This technique is explicitly permitted in Section 9.2.1.3 and maintains valid VOH/VOL levels within specification limits.