Texas Instruments SN74AHC1GU04DCKR

Overview

SN74AHC1GU04 from Texas Instruments is a single unbuffered CMOS inverter gate operating from 2 V to 5.5 V, delivering ±8-mA output drive at 5 V, with propagation delay as low as 3.5 ns (VCC = 5 V, CL = 15 pF), and rated for –40°C to +125°C operation. It serves as a logic-level inverter or linear amplifier in crystal oscillator circuits.

For engineers reviewing the SN74AHC1GU04 datasheet, SN74AHC1GU04 pinout, SN74AHC1GU04 application, or SN74AHC1GU04 equivalent, key selection criteria include its unbuffered output architecture, overvoltage-tolerant inputs (up to 5.5 V), latch-up immunity (>250 mA), and SC-70 (DCK) 5-pin package footprint compatibility with space-constrained timing and signal conditioning designs.

Technical Context

This device implements a single-stage CMOS inverter performing Y = A logic inversion with no internal buffering-enabling direct use in Pierce oscillator topologies. Its input structure accepts voltages up to 5.5 V regardless of VCC, supporting level-shifting between mixed-voltage domains.

The unbuffered output stage provides high gain and low phase shift critical for stable crystal oscillation, while its ±8-mA drive capability at 5 V supports driving moderate capacitive loads without external amplification. Thermal resistance (RθJA = 287.6°C/W) and ESD robustness (2000-V HBM) are specified for SC-70 packaging.

Key Specifications

Pinout & Package

SN74AHC1GU04DCKR is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.30 mm, optimized for high-density PCB layouts. The package features gull-wing leads, moisture sensitivity level 1 (260°C peak reflow), and RoHS-compliant NiPdAu/Sn lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHC1GU04DCKR, SN74LVC1G04DCKR offers higher drive but sacrifices oscillator stability due to buffering, while MC74VHC1G04DTT1G matches core functionality and unbuffered performance but requires validation of HBM robustness in high-handling-volume production.

Availability

SN74AHC1GU04DCKR is available at Aetrix Electronics and suitable for crystal oscillator design, industrial sensor interface conditioning, and low-power timing reference applications requiring stable component supply across automotive, medical, and industrial embedded programs.

Supply support for SN74AHC1GU04DCKR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability logic families and precision timing components.

SN74AHC1GU04 belongs to the AHC advanced high-speed CMOS logic family, designed for low-power, high-noise-immunity digital signal conditioning in space-constrained and thermally demanding applications.

FAQ

What is the maximum input voltage allowed on SN74AHC1GU04DCKR when VCC = 3.3 V?

The SN74AHC1GU04DCKR supports input voltages up to 5.5 V regardless of VCC level. When operating at VCC = 3.3 V, inputs may safely accept 0–5.5 V signals without damage or functional degradation. This overvoltage tolerance eliminates the need for external clamping diodes or level-shifting circuitry in mixed-voltage systems, simplifying interface design while maintaining signal integrity for the SN74AHC1GU04DCKR.

Can SN74AHC1GU04DCKR be used in a Pierce crystal oscillator circuit?

Yes, SN74AHC1GU04DCKR is explicitly designed for oscillator applications due to its unbuffered output stage, which provides the high gain and low phase shift required for stable Pierce topology operation. The device's internal single-stage inverter architecture avoids added delay or distortion that buffered gates introduce. For optimal performance, pair SN74AHC1GU04DCKR with appropriate load capacitors and a fundamental-mode crystal matching its specified frequency and load capacitance requirements.

What is the thermal resistance (RθJA) of SN74AHC1GU04DCKR in its SC-70 package?

The junction-to-ambient thermal resistance (RθJA) for SN74AHC1GU04DCKR in the SC-70 (DCK) package is 287.6°C/W under standard JEDEC test conditions. This value assumes a two-layer board with 1-in² copper pour on both sides. Actual thermal performance depends on PCB layout, copper area, airflow, and nearby heat sources. To maintain reliability at full output drive, ensure ambient temperature remains within the –40°C to +125°C operating range specified for SN74AHC1GU04DCKR.

Does SN74AHC1GU04DCKR require external pull-up or pull-down resistors on unused pins?

Pin 1 (NC) of SN74AHC1GU04DCKR has no internal connection and must remain unconnected - no pull-up or pull-down is needed or recommended. However, all unused *inputs* (not applicable here, as SN74AHC1GU04DCKR has only one input, Pin 2) must be tied to VCC or GND to prevent floating states. Since SN74AHC1GU04DCKR contains only one functional input (A) and one output (Y), no unused logic inputs exist; proper decoupling on VCC (Pin 5) and solid grounding of GND (Pin 3) are the critical layout requirements for SN74AHC1GU04DCKR.

What is the minimum propagation delay for SN74AHC1GU04DCKR at 5 V supply?

The minimum propagation delay for SN74AHC1GU04DCKR is 3.5 ns, measured under VCC = 5 V ± 0.5 V, CL = 15 pF, and TA = 25°C conditions for both tPLH and tPHL. This value represents best-case timing performance; actual delays increase with temperature, load capacitance, and supply voltage reduction. At VCC = 3.3 V and CL = 15 pF, typical delay rises to 5 ns. These values are critical for timing-critical oscillator and clock-synchronization applications using SN74AHC1GU04DCKR.