Texas Instruments CD74HCT00M

Overview

CD74HCT00M from Texas Instruments is a quadruple 2-input NAND gate IC in SOIC-14 package, performing Y = A ● B logic in positive logic with buffered CMOS inputs and balanced push-pull outputs. It operates from 4.5 V to 5.5 V, supports –55°C to +125°C industrial/military temperature range, delivers <23 ns propagation delay at 5 V, and drives up to 10 LSTTL loads - used in tamper-detect latches and S-R latch circuits.

For engineers reviewing the CD74HCT00M datasheet, CD74HCT00M pinout, CD74HCT00M application, or CD74HCT00M equivalent, key selection criteria include its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), rail-to-rail output swing, low static ICC (≤20 µA), and guaranteed operation across extended temperature extremes without derating.

Technical Context

This device implements four independent NAND gates using HCT (High-Speed CMOS with TTL-compatible inputs) process technology, enabling direct interface with legacy TTL logic while retaining CMOS power efficiency. Its input structure includes clamping diodes for ESD protection and standard CMOS input impedance (>10¹² Ω), with VIH/VIL thresholds aligned to TTL levels.

The output stage uses balanced CMOS push-pull drivers capable of sourcing/sinking ±4 mA at VOH/VOL specifications, supporting fanout to 10 LSTTL loads. Propagation delay (tpd ≤23 ns @ 5 V, CL = 50 pF) and transition time (tt ≤19 ns) are characterized over full temperature and voltage ranges, ensuring timing predictability in deterministic digital control paths.

Key Specifications

Pinout & Package

CD74HCT00M is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 3.90 mm, with gull-wing leads, RoHS-compliant NiPdAu/Sn finish, and MSL Level-1 rating (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HCT00M, SN74HCT00DR offers updated manufacturability and environmental compliance, while MC74HCT00AD provides a verified second-source with identical functionality but marginally higher quiescent current - both preserve timing, drive strength, and temperature range for drop-in reuse in existing layouts.

Availability

CD74HCT00M is available at Aetrix Electronics and suitable for alarm/tamper detection, S-R latch implementation, and industrial control logic requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for CD74HCT00M 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 decades of heritage in high-reliability logic families.

The CD74HCT00M belongs to TI's HCT logic series, engineered specifically for interoperability with legacy TTL systems while delivering CMOS power efficiency and extended temperature resilience for mission-critical applications.

FAQ

What is the maximum operating supply voltage for CD74HCT00M?

The CD74HCT00M is rated for a supply voltage range of 4.5 V to 5.5 V. Operation outside this window - particularly above 5.5 V - violates Absolute Maximum Ratings and risks permanent damage. The device is not specified for 3.3 V operation; for lower-voltage systems, consider CD74HC00M instead. Always verify VCC stability under load using the recommended 0.1 µF bypass capacitor adjacent to Pin 14.

Can CD74HCT00M drive an LED directly?

Yes, CD74HCT00M can drive an LED directly when configured as an active-low output (e.g., sinking current through cathode to GND). With VOL ≤ 0.4 V at IOL = 4 mA and VCC = 5 V, it supports typical red/green LEDs with a series resistor ≥ 1.1 kΩ. Avoid sourcing current from VCC through anode - output high-drive capability is limited to IOH = –4 mA, and forward voltage drop reduces margin. Always confirm thermal dissipation in continuous-drive scenarios.

Is CD74HCT00M pin-compatible with CD74HC00M?

No, CD74HCT00M is not pin-compatible with CD74HC00M in functional interchange - though both share the same SOIC-14 package and pinout, their input threshold voltages differ significantly. CD74HCT00M accepts TTL-level inputs (VIH ≥ 2.0 V), while CD74HC00M requires CMOS-level inputs (VIH ≥ 3.15 V at VCC = 4.5 V). Swapping them may cause logic misreads in mixed-signal systems; verify input source compatibility before substitution.

What is the recommended bypass capacitor for CD74HCT00M?

Texas Instruments specifies a 0.1 µF ceramic capacitor placed as close as possible to Pins 14 (VCC) and 7 (GND) of the CD74HCT00M. This capacitor must have low ESL/ESR and be mounted with minimal trace length to suppress high-frequency switching noise. For systems with variable load transients, paralleling a 1 µF capacitor is acceptable - but the 0.1 µF unit remains mandatory for effective decoupling at the device's fundamental switching frequencies.

Does CD74HCT00M require pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs on CD74HCT00M must be terminated - either directly to VCC or GND - to prevent floating states that cause excessive current draw, oscillation, or undefined logic behavior. A 10 kΩ resistor is recommended if dynamic control is needed; direct connection is preferred for static termination. Leaving inputs unconnected violates design guidelines and risks increased ICC and thermal stress, especially over temperature extremes.