STMicroelectronics M74HCU04B1R

Overview

M74HCU04B1R from STMicroelectronics is a high-speed CMOS hex inverter (single-state) fabricated with silicon gate C2MOS technology, used for signal inversion and crystal oscillator circuits. It features 5 ns typical propagation delay at 6 V, 2–6 V operating voltage range, ±4 mA symmetrical output drive, 1 µA max quiescent current at 25°C, and DIP-14 package compatibility with standard 74-series logic.

For engineers reviewing the M74HCU04B1R datasheet, M74HCU04B1R pinout, M74HCU04B1R application, or M74HCU04B1R equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), wide VCC range (2–6 V), high noise immunity (VNIH/VNIL ≥ 10% VCC), and suitability for low-power oscillator and waveform shaping designs.

Technical Context

The M74HCU04B1R implements six independent single-stage CMOS inverters with no internal feedback or latch structure, enabling direct use in Pierce-type crystal oscillator configurations. Its input protection diodes and rail-to-rail input voltage tolerance (–0.5 V to VCC + 0.5 V) support robust interfacing in mixed-voltage systems.

Propagation delays are balanced (tPLH ≅ tPHL) across temperature ranges (–55°C to +125°C), and output impedance is symmetrical (|IOH| = IOL ≥ 4 mA), ensuring consistent rise/fall times (7–13 ns typ. at 6 V, CL = 50 pF). Input capacitance is 5 pF, and power dissipation capacitance CPD is 13 pF.

Key Specifications

Pinout & Package

Package: Plastic Dual In-line Package (DIP-14), 0.3" wide body, through-hole mount, JEDEC MS-001 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverter applications.

Compared with SN74HC04N and 74LVC04PW, the M74HCU04B1R uniquely combines extended temperature operation (–55°C to +125°C), 2–6 V flexibility, and DIP-14 through-hole compatibility-making it the only choice for legacy industrial hardware upgrades and crystal oscillator designs requiring guaranteed startup across full military-grade thermal range.

Availability

M74HCU04B1R is available at Aetrix Electronics and suitable for crystal oscillator circuits, industrial control logic, pulse shaping networks, and legacy 74-series system upgrades requiring stable component supply and long-term obsolescence management.

Supply support for M74HCU04B1R 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, specializing in automotive, industrial, and power management ICs with broad analog, digital, and mixed-signal portfolios.

The M74HCU04B1R belongs to ST's legacy high-speed CMOS logic family, designed specifically for reliable timing, signal conditioning, and oscillator applications in harsh-environment industrial and transportation systems.

FAQ

Can M74HCU04B1R operate reliably at 2.0 V supply?

Yes. The device is fully specified down to 2.0 V: VOH ≥ 1.8 V (IO = –20 µA), VOL ≤ 0.2 V (IO = 20 µA), and tPD ≤ 90 ns (max) across –55°C to +125°C. This enables use in coin-cell–powered real-time clocks and low-voltage sensor nodes without regulation.

Is M74HCU04B1R pin-compatible with standard 7404 devices?

Yes. It is functionally and physically pin-compatible with industry-standard 7404 hex inverters in DIP-14 packages, including identical pin numbering (1A–6A inputs, 1Y–6Y outputs, VCC on pin 14, GND on pin 7), allowing drop-in replacement in legacy designs.

What is the maximum capacitive load this device can drive?

At VCC = 6 V, the device drives 50 pF loads with tTLH/tTHL ≤ 19 ns (max) and maintains VOH ≥ 5.63 V (IO = –5.2 mA). Driving >100 pF is not characterized; for heavier loads, buffer staging or reduced frequency is recommended.

Does M74HCU04B1R require external pull-up or pull-down resistors on unused inputs?

No. All inputs include internal protection diodes and have defined logic thresholds (VIH ≥ 1.7 V, VIL ≤ 0.3 V at 2 V); however, floating inputs must be avoided-unused inputs should be tied to VCC or GND to prevent increased ICC and potential oscillation in adjacent channels.