onsemi NC7SZU04AFHX

Overview

NC7SZU04AFHX from onsemi is a single unbuffered inverter in the TinyLogic UHS family, designed specifically for crystal oscillator and analog applications. It operates across 1.65 V to 5.5 V V_CC, delivers ±16 mA output drive at 4.5 V, exhibits 3.9 ns propagation delay at 5.0 V with 15 pF load, and uses UDFN6 (MicroPak2™) packaging for ultra-compact timing circuits.

For engineers reviewing the NC7SZU04AFHX datasheet, pinout, applications, or equivalent options, key selection criteria include unbuffered topology for oscillator feedback paths, low ICC (<2 µA at 5.5 V), sub-1 ns input capacitance (4.5 pF), thermal resistance of 154 °C/W, and RoHS-compliant UDFN6 footprint compatibility with high-density PCB layouts.

Technical Context

The NC7SZU04AFHX implements an unbuffered CMOS inverter stage optimized for linear-region operation in Pierce-type crystal oscillator circuits - not logic-level signal inversion. Its balanced ±16 mA drive capability enables stable oscillation startup and sustained gain margin across 1.65–5.5 V supply range.

Unlike buffered inverters, it lacks internal staging that would degrade phase noise or limit analog swing; instead, its direct gate-drive architecture supports precise biasing control and avoids unintended hysteresis. The device's ICCPEAK reaches 30 mA at 5.0 V during analog operation, requiring thermal derating per its 154 °C/W θ_JA.

Key Specifications

Pinout & Package

NC7SZU04AFHX is housed in a 1.0 mm × 1.0 mm, 0.35 mm pitch UDFN6 (MicroPak2™) package with wettable flank leads for automated optical inspection. Pin 1 is marked by a dot; pins are arranged in a 2×3 grid with no internal die bond wires to pins 1 and 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G04DBVR and 74AUP1G04GW,125, the NC7SZU04AFHX uniquely combines unbuffered topology, ±16 mA drive, 1.65–5.5 V operation, and UDFN6 packaging - making it the only option among the three qualified for high-reliability, wide-supply crystal oscillator designs requiring sub-4 ns propagation and thermal robustness.

Availability

NC7SZU04AFHX is available at Aetrix Electronics and suitable for real-time clock (RTC) modules, industrial PLC timing references, and medical wearable synchronization circuits requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant UDFN packaging.

Supply support for NC7SZU04AFHX 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The TinyLogic UHS family - including NC7SZU04AFHX - was engineered for ultra-high-speed, low-power analog and timing functions in space-constrained systems, with emphasis on crystal oscillator stability, minimal parasitic loading, and broad supply voltage interoperability.

FAQ

What is the primary circuit role of the NC7SZU04AFHX in oscillator designs?

The NC7SZU04AFHX serves as the gain element in Pierce crystal oscillator circuits. Its unbuffered CMOS inverter stage operates in the linear region to provide phase inversion and sufficient transconductance - not digital logic switching. This enables reliable oscillation startup and sustained amplitude with minimal added phase noise, unlike buffered inverters which introduce unwanted delay and hysteresis.

Can NC7SZU04AFHX replace buffered inverters like SN74LVC1G04 in existing designs?

No - NC7SZU04AFHX is not a drop-in replacement for buffered inverters. Its unbuffered architecture lacks internal staging, resulting in different input/output characteristics, higher sensitivity to capacitive loading, and undefined behavior under digital logic conditions. Replacing SN74LVC1G04 with NC7SZU04AFHX requires redesign of biasing, feedback, and load networks to exploit its linear-region operation.

Why does NC7SZU04AFHX specify ICCPEAK up to 30 mA while its quiescent ICC is under 2 µA?

The NC7SZU04AFHX draws <2 µA in static DC conditions but can sink/source up to 30 mA peak during analog operation - such as when its output stage conducts simultaneously in the linear region during crystal oscillation. This ICCPEAK reflects transient conduction current, not steady-state logic current, and must be thermally managed using its 154 °C/W θ_JA rating in the UDFN6 package.

Is NC7SZU04AFHX pin-compatible with other TinyLogic UHS inverters in UDFN6 packages?

Yes - NC7SZU04AFHX shares identical UDFN6 (Case 517DP) pinout and footprint with NC7SZU04AL6X and other MicroPak2™-packaged variants in the same family. Pin assignments (1=NC, 2=A, 3=GND, 4=Y, 5=NC, 6=V_CC) are consistent across all UDFN6-marked onsemi TinyLogic UHS inverters, enabling layout reuse across speed- or drive-optimized variants.

What is the significance of the 4.5 pF input capacitance (C_IN) specification for NC7SZU04AFHX?

The 4.5 pF C_IN of NC7SZU04AFHX directly impacts crystal oscillator stability and accuracy. Lower input capacitance reduces parasitic loading on the crystal's electrodes, preserving its effective series resistance (ESR) and quality factor (Q). This enables tighter frequency tolerance (e.g., ±20 ppm), reduced aging drift, and improved start-up reliability - especially critical in 32.768 kHz RTC and low-power sensor timing applications.