STMicroelectronics M74HC03B1R

Overview

M74HC03B1R from STMicroelectronics is a high-speed CMOS quad 2-input open-drain NAND gate in 14-pin DIP package, operating from 2V to 6V supply, with 8ns typical propagation delay at 6V, 1µA max quiescent current at 25°C, and 28% VCC noise immunity. It serves as a current-sinking logic gate for wired-AND bus interfaces and LED driving in industrial control panels.

For engineers reviewing the M74HC03B1R datasheet, M74HC03B1R pinout, M74HC03B1R application, or M74HC03B1R equivalent, key selection criteria include open-drain output drive capability (5.2mA sink at 6V), input voltage thresholds (VIH = 4.2V min at VCC = 6V), temperature range (-55°C to +125°C), and DIP-14 mechanical compatibility with legacy through-hole PCB layouts.

Technical Context

The M74HC03B1R implements four independent NAND gates with open-drain outputs, requiring external pull-up resistors for logic HIGH assertion. Each gate features buffered output stages using silicon gate C2MOS technology to ensure balanced tPLH ≅ tPHL delays and stable switching under capacitive loads up to 50pF.

Its input protection circuitry includes diodes for ±20mA ESD and transient voltage clamping, while the wide 2–6V VCC range enables interoperability with both 3.3V and 5V logic families. The device supports wired-AND bus topologies by enabling multiple outputs to share a common pull-up without contention.

Key Specifications

Pinout & Package

Package: Plastic DIP-14 (Dual In-line Package, 0.3" width), compliant with JEDEC MS-001, with 2.54mm lead pitch and through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC03N and 74AHC03PW, M74HC03B1R uniquely combines extended temperature qualification (-55°C to +125°C), DIP-14 through-hole compatibility, and proven field reliability in harsh industrial environments-making it optimal for legacy-replacement and high-reliability control systems.

Availability

M74HC03B1R is available at Aetrix Electronics and suitable for industrial bus interface, LED status indication, level translation, and reset signal conditioning requiring stable component supply across long-lifecycle production programs.

Supply support for M74HC03B1R 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 automotive, industrial, and consumer markets.

M74HC03B1R belongs to the M74HC high-speed CMOS logic family, engineered for robust performance in industrial control, programmable logic interfaces, and legacy system upgrades where reliability and wide supply voltage tolerance are critical.

FAQ

Is M74HC03B1R pin-compatible with standard 74LS03?

Yes, M74HC03B1R is pin- and function-compatible with 74LS03, sharing identical DIP-14 pinout and NAND logic function. However, its open-drain outputs require external pull-up resistors, unlike 74LS03's totem-pole outputs. Input voltage thresholds differ: M74HC03B1R uses CMOS-compatible VIH/VIL (4.2V/1.8V at 6V), whereas 74LS03 uses TTL thresholds (2.0V/0.8V).

What is the maximum sink current per output at 5V VCC?

At VCC = 5V and TA = 25°C, M74HC03B1R guarantees a maximum output sink current of 4.0mA with VOL ≤ 0.33V. This is specified in the DC Electrical Characteristics table under "VOL Low Level Output Voltage" test condition IO = 4.0mA at VCC = 4.5V, interpolated to 5V using monotonic behavior confirmed in ST's characterization data.

Can M74HC03B1R drive a 5V relay coil directly?

No-M74HC03B1R's 5.2mA max sink current at 6V is insufficient for typical 5V relay coils, which require 10–70mA. It can drive a small-signal NPN transistor (e.g., BC847) base to switch higher-current loads. The open-drain output must be paired with a pull-up resistor to VCC or a separate higher-voltage rail if interfacing with relays requiring >6V.

Does M74HC03B1R support 3.3V-only operation?

Yes, M74HC03B1R operates fully across 2V–6V, including 3.3V nominal supply. At VCC = 3.3V, VIH is guaranteed ≥2.31V and VIL ≤ 1.16V, providing 35% noise margin. Propagation delay increases to ~12ns (typ), and sink current reduces to ~3.5mA, both within specification for most 3.3V logic interfacing and LED-driving use cases.