STMicroelectronics M74HCT02B1R

Overview

M74HCT02B1R from STMicroelectronics is a high-speed CMOS quad 2-input NOR gate in a 14-pin plastic DIP package, featuring 15 ns typical propagation delay at 4.5 V, TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and symmetrical 4 mA output drive capability. It interfaces HCMOS systems with TTL/NMOS logic in industrial control and digital signal routing applications.

For engineers reviewing the M74HCT02B1R datasheet, M74HCT02B1R pinout, M74HCT02B1R application, or M74HCT02B1R equivalent, key selection criteria include propagation delay matching, output drive strength under 4.5–5.5 V supply, noise immunity via buffered output stages, and compatibility with legacy 74-series logic families.

Technical Context

The M74HCT02B1R implements four independent 2-input NOR gates using silicon gate C2MOS technology with three-stage internal buffering, delivering high noise immunity and stable rail-to-rail output transitions. Its input protection circuits guard against ESD and transient overvoltage, and its symmetrical output impedance ensures matched rise/fall times (tPLH ≅ tPHL).

Designed for direct interfacing between HCMOS and TTL/NMOS systems, it operates across -55°C to +125°C with guaranteed VIH/VIL thresholds, 4 mA output sink/source capability, and low quiescent current (1 µA max at 25°C), enabling robust performance in mixed-logic environments.

Key Specifications

Pinout & Package

Package: Plastic Dual In-line Package (DIP-14), 0.3-inch body width, through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT02N and 74VHC02N, the M74HCT02B1R uniquely supports full military-grade temperature range (-55°C to +125°C) while retaining native TTL input compatibility-critical for field-deployed instrumentation and aerospace subsystems where both robustness and legacy interoperability are mandatory.

Availability

M74HCT02B1R is available at Aetrix Electronics and suitable for industrial PLC I/O modules, digital panel meter logic, and legacy system logic retrofit requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HCT02B1R 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, designing and manufacturing analog, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.

The M74HCT02B1R belongs to ST's high-speed CMOS logic family, engineered specifically for seamless interoperability between modern CMOS systems and legacy TTL/NMOS infrastructure in harsh-environment applications.

FAQ

What is the maximum operating temperature for M74HCT02B1R?

The M74HCT02B1R is fully specified from -55°C to +125°C, with all DC and AC parameters guaranteed across this full range. This extended rating is validated per STMicroelectronics' industrial and automotive qualification standards and enables use in under-hood automotive modules, downhole sensors, and industrial motor drives where ambient temperatures exceed 85°C.

Can M74HCT02B1R directly drive a 74LS00 input?

Yes. With VIH ≥ 2.0 V (min) and VIL ≤ 0.8 V (max), the M74HCT02B1R meets and exceeds 74LS input threshold requirements. Its 4 mA output drive also satisfies the 74LS high-level input current (IIH = 20 µA max) and low-level sink requirement (IIL = -0.4 mA), enabling direct connection without pull-up resistors or level shifters.

Does M74HCT02B1R require external pull-up resistors on unused inputs?

No. Unused inputs must be tied to VCC or GND to prevent floating nodes, but no external pull-up resistors are needed-the device's input leakage current is only ±1 µA max at 5.5 V, and internal structure does not rely on weak pull-ups. Leaving inputs unconnected risks oscillation and increased ICC due to undefined logic states.

Is the M74HCT02B1R RoHS compliant?

Yes. As manufactured by STMicroelectronics and supplied in the DIP-14 package (order code M74HCT02B1R), this part complies with EU RoHS Directive 2011/65/EU and subsequent amendments, including exemption 7a for lead in high-melting-temperature solder. Full compliance documentation is available via ST's official product page and Aetrix Electronics' material declarations.