onsemi SZNZ9F20VT5G

Overview

SZNZ9F20VT5G from onsemi is a 20 V ±5% Zener diode in SOD-923 package, rated for 250 mW steady-state power dissipation, with 55 Ω maximum Zener impedance at 5 mA test current and 0.1 μA reverse leakage at 15.4 V, used for precision voltage regulation and overvoltage protection in space-constrained portable electronics.

For engineers reviewing the SZNZ9F20VT5G datasheet, pinout, applications, or equivalent options, key selection factors include its AEC-Q101 qualification, 16 kV HBM ESD rating, low 0.4 mm height, RoHS-compliant matte tin finish, and thermal resistance of 500 °C/W - critical for high-density PCBs in automotive and handheld designs.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at nominal 20 V with ±5% tolerance (19.0–21.0 V). It exhibits a positive temperature coefficient of +15.4 mV/°C and 55 pF capacitance at 0 V, enabling stable regulation under transient load conditions.

Designed for surface-mount use on FR-5 or FR-4 boards, it supports reflow up to 260 °C (MSL 1), features void-free thermosetting plastic encapsulation (UL 94 V-0), and maintains junction temperature range from −65 °C to +150 °C - suitable for automotive cabin and industrial edge environments.

Key Specifications

Pinout & Package

SOD-923 is a 2-pin surface-mount package with cathode marked by polarity band; body dimensions are 1.00 mm × 0.60 mm × 0.40 mm, mounted in any orientation with matte tin lead finish and UL 94 V-0 epoxy.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Compared with BZX584C20LT1G and MMSZ5248ET1G, the SZNZ9F20VT5G uniquely balances ultra-small SOD-923 footprint, AEC-Q101 qualification, and 16 kV ESD immunity - making it optimal for automotive and portable electronics where board space, reliability, and ESD robustness are jointly constrained.

Availability

SZNZ9F20VT5G is available at Aetrix Electronics and suitable for smartphone power management, automotive cabin controllers, industrial IoT sensor nodes, and USB-C PD adapter feedback loops requiring stable component supply with full traceability and lifecycle support.

Supply support for SZNZ9F20VT5G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NZ9F/SZNZ9F series is designed specifically for compact, high-reliability voltage regulation in portable and automotive electronics - emphasizing ultra-small packaging, AEC-Q101 compliance, and high ESD robustness.

FAQ

What is the Zener voltage tolerance for SZNZ9F20VT5G?

The SZNZ9F20VT5G has a Zener voltage range of 19.0 V to 21.0 V at 5 mA test current, representing a ±5% tolerance around the nominal 20 V rating. This specification is measured at 25 °C ambient temperature per the onsemi datasheet, and the device's +15.4 mV/°C temperature coefficient defines how the voltage shifts across its operating range. The SZNZ9F20VT5G maintains this tolerance under steady-state conditions and is validated for use in production-grade automotive and portable designs.

Is SZNZ9F20VT5G suitable for automotive applications?

Yes, the SZNZ9F20VT5G is explicitly AEC-Q101 qualified and PPAP capable, with an SZ prefix indicating compliance for automotive and other high-reliability applications. Its operating junction temperature range of −65 °C to +150 °C, 16 kV HBM ESD rating, and void-free UL 94 V-0 molded package meet stringent automotive environmental requirements. The SZNZ9F20VT5G is deployed in cabin controllers, body electronics, and ADAS subsystems where space and reliability are critical.

What is the maximum power dissipation of SZNZ9F20VT5G at 85 °C ambient?

At 85 °C ambient temperature, the SZNZ9F20VT5G derates linearly from its 250 mW rating at 25 °C using a 2.0 mW/°C slope. This yields 250 mW − (85 − 25) × 2.0 mW = 130 mW maximum steady-state power dissipation. Thermal resistance is fixed at 500 °C/W, so junction temperature rise above ambient remains proportional to actual power applied. The SZNZ9F20VT5G must be applied within this derated limit to ensure reliability and avoid thermal runaway.

Does SZNZ9F20VT5G have a polarity marking, and how is it identified?

Yes, the SZNZ9F20VT5G uses Style 1 marking per the SOD-923 mechanical drawing: Pin 1 (cathode) is identified by a visible polarity band on the banded end of the package. The anode is the unmarked terminal. Marking consists of a device-specific code (V*) followed by a date code; the "G" suffix confirms Pb-free compliance. This polarity identification is essential for correct orientation during automated placement and ensures proper reverse-bias operation of the SZNZ9F20VT5G in circuit.

What is the reverse leakage current specification for SZNZ9F20VT5G?

The SZNZ9F20VT5G specifies a maximum reverse leakage current (I_R) of 0.1 μA at a reverse voltage (V_R) of 15.4 V, measured at 25 °C. This low leakage ensures minimal quiescent current draw in battery-powered applications such as portable sensors and wearables. The value is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies to all units shipped as SZNZ9F20VT5G - critical for maintaining long-term battery life in always-on monitoring systems.