onsemi 74HCU04DR2G

Overview

74HCU04DR2G from onsemi is a hex unbuffered inverter IC in SOIC-14 package, operating from 2.0 V to 6.0 V, delivering 10 LSTTL load drive capability, with propagation delay as low as 12 ns at 6.0 V and input capacitance of 10 pF. It serves as a high-input-impedance digital inverter for oscillator circuits, pulse shaping, and level translation in industrial control and sensor interface systems.

For engineers reviewing the 74HCU04DR2G datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage range (2.0–6.0 V), guaranteed propagation delay across temperature (–55°C to +125°C), output drive strength (±25 mA per pin), and Pb-free SOIC-14 packaging compliance with JEDEC Std. 7.0A.

Technical Context

The 74HCU04DR2G implements six independent single-stage CMOS inverters using high-performance silicon-gate technology. Its unbuffered architecture enables direct use in crystal and RC oscillator configurations, with specified operation down to 2.5 V in such topologies.

Input compatibility spans standard CMOS and, with pullup resistors, LSTTL logic families; outputs interface directly to CMOS, NMOS, and TTL loads. The device features ESD protection rated at 2000 V HBM and operates reliably from –55°C to +125°C.

Key Specifications

Pinout & Package

74HCU04DR2G is housed in a Pb-free SOIC-14 (Case 751A) package, 8.55–8.75 mm × 3.80–4.00 mm × 1.35–1.75 mm, with 1.27 mm pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC04DR and MC74HC04ADTR2G, the 74HCU04DR2G uniquely supports stable oscillator operation down to 2.5 V and delivers lowest propagation delay (12 ns) among pin-compatible hex inverters, making it optimal for timing-critical and low-voltage embedded designs.

Availability

74HCU04DR2G is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and sensor signal conditioning systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 74HCU04DR2G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.

The 74HCU04DR2G belongs to the High-Speed CMOS (HCU) logic family, designed specifically for applications demanding low-power, wide-voltage-range inverters with oscillator-grade phase stability and robust noise immunity.

FAQ

What is the maximum operating frequency achievable with 74HCU04DR2G in a crystal oscillator circuit?

The 74HCU04DR2G supports fundamental-mode crystal oscillators up to 10 MHz when used with standard AT-cut quartz crystals and appropriate load capacitors. Its unbuffered design and guaranteed propagation delay of 12 ns at 6.0 V enable stable oscillation with minimal phase jitter; actual upper frequency depends on crystal ESR, PCB layout parasitics, and external feedback resistor value.

Can 74HCU04DR2G be operated from a 2.5 V supply in non-oscillator digital logic applications?

Yes, the 74HCU04DR2G is fully specified for digital logic operation at 2.5 V - its recommended operating range is 2.0 V to 6.0 V. At 2.5 V, VOH is guaranteed ≥2.2 V and VOL ≤0.32 V under 2.4 mA load, meeting standard 2.5 V CMOS thresholds. Propagation delay increases to ~45 ns, which remains suitable for control and interface logic below 10 MHz.

Does 74HCU04DR2G require external pull-up resistors when interfacing with LSTTL outputs?

Yes - because 74HCU04DR2G inputs are CMOS-compatible (high-impedance, no internal biasing), they require external pull-up resistors (typically 10 kΩ) when driven by LSTTL outputs to ensure VIH exceeds 2.0 V minimum at VCC = 5.0 V. Without pull-ups, LSTTL VOH (2.4 V min) may fall below the 74HCU04DR2G's VIH threshold (2.5 V min at VCC = 5.0 V), risking logic misreads.

What is the thermal derating behavior of 74HCU04DR2G in SOIC-14 package above 65°C?

The 74HCU04DR2G in SOIC-14 package has a thermal derating slope of –7 mW/°C above 65°C ambient. Starting from 500 mW maximum power dissipation at ≤65°C, usable power drops to 465 mW at 70°C and 430 mW at 75°C. This reflects junction-to-ambient thermal resistance (~140°C/W) and must be considered when driving multiple outputs simultaneously at elevated temperatures.

How should unused inputs and outputs be handled on 74HCU04DR2G?

Unused inputs on 74HCU04DR2G must be tied to a valid logic level - either VCC or GND - to prevent floating states that cause excessive ICC current and potential oscillation. Unused outputs must be left open (unconnected); connecting them to VCC, GND, or other nodes risks contention, increased power consumption, or latch-up due to CMOS output structure.