STMicroelectronics M74HC02B1R

Overview

M74HC02B1R from STMicroelectronics is a high-speed CMOS quad 2-input NOR gate in a 14-pin DIP package, operating from 2V to 6V supply, with typical propagation delay of 8ns at 6V, symmetrical output drive (±4mA), and high noise immunity (28% VCC). It serves as a fundamental logic building block in digital control circuits, such as reset signal generation in microcontroller power-up sequencing.

For engineers reviewing the M74HC02B1R datasheet, M74HC02B1R pinout, M74HC02B1R application, or M74HC02B1R equivalent, key selection criteria include guaranteed 2–6V operation, ±4mA output drive capability, 8ns typical propagation delay, input/output voltage tolerance up to VCC + 0.5V, and compatibility with legacy 74-series logic families.

Technical Context

The M74HC02B1R implements four independent 2-input NOR gates using silicon gate C2MOS technology, with three-stage buffered output architecture that enhances noise immunity and output stability. Each gate features diode-protected inputs for ESD and transient voltage resilience.

It operates across an extended industrial temperature range (–55°C to +125°C) and supports input rise/fall times up to 1000ns at 2V, 500ns at 4.5V, and 400ns at 6V-enabling robust interfacing with slower control signals without timing violation.

Key Specifications

Pinout & Package

Package: Plastic Dual In-line Package (DIP-14), 0.3" wide, through-hole mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input NOR gate applications.

Compared with SN74HC02N and 74VHC02N, the M74HC02B1R uniquely combines full –55°C to +125°C qualification, 6V absolute maximum rating, and 1µA max ICC - making it the only option qualified for under-hood automotive and high-reliability industrial control without derating.

Availability

M74HC02B1R is available at Aetrix Electronics and suitable for industrial PLC input conditioning, microcontroller reset logic, legacy system logic retrofit, and automotive body control module applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC02B1R 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The M74HC02B1R belongs to ST's high-speed CMOS logic family, engineered specifically for reliable, low-power, pin-compatible upgrades of legacy 74-series TTL logic in harsh-environment applications.

FAQ

Is M74HC02B1R compatible with 5V TTL inputs?

Yes. The M74HC02B1R accepts TTL-level inputs (VIH ≥ 2.0V, VIL ≤ 0.8V) across its full 2–6V VCC range. At VCC = 5V, VIH(min) = 3.15V and VIL(max) = 1.35V per datasheet, exceeding standard TTL thresholds and ensuring robust interoperability without external level shifters.

What is the maximum capacitive load this device can drive reliably?

The M74HC02B1R is characterized with CL = 50pF in AC specifications, and its output drive (±4mA min) supports loads up to ~75pF while maintaining specified tPLH/tPHL and VOH/VOL margins. For loads >50pF, propagation delay increases linearly; design margin should include 20% derating for worst-case temperature and voltage.

Does M74HC02B1R require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs must be tied to VCC or GND to prevent floating states and increased ICC. The device does not integrate internal pull-ups/pull-downs; leaving inputs unconnected risks oscillation, excess current draw, and EMI due to high-impedance nodes in the C2MOS input structure.

Can M74HC02B1R operate at 2.0V supply with full timing guarantees?

Yes. The datasheet specifies tPLH/tPHL (max) = 110ns and tTLH/tTHL (max) = 110ns at VCC = 2.0V over –55°C to +125°C. While typical delay is 27ns, the full parametric guarantee holds across temperature and voltage extremes, enabling use in ultra-low-voltage battery-powered systems.