onsemi SZBZX84C22ET1G

Overview

SZBZX84C22ET1G from onsemi is a 22 V, 250 mW surface-mount Zener diode in SOT-23 package, with nominal Zener voltage of 22 V at 20 mA test current, dynamic impedance of 25 Ω at 20 mA, and temperature coefficient of +16.4 mV/°C - used for precision voltage regulation in low-power portable power rails and reference circuits.

For engineers reviewing the SZBZX84C22ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±1.1 V), leakage current (≤50 nA at 17.6 V), thermal resistance (500 °C/W on FR-5 board), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device operates as a two-terminal voltage reference diode with reverse-biased breakdown behavior. Its Zener voltage is specified at three test currents (1 mA, 5 mA, and 20 mA), enabling stable regulation across varying load conditions. The +16.4 mV/°C temperature coefficient indicates positive drift with rising junction temperature, requiring compensation in high-precision references.

Designed for FR-4/FR-5 PCBs, it delivers 250 mW total power dissipation at 25 °C ambient, derating linearly above that point. With ESD rating >16 kV (HBM Class 3) and Pb-free RoHS-compliant construction, it supports automated assembly and harsh-environment deployment.

Key Specifications

Pinout & Package

Package: SOT-23 (TO-236), 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant solderable finish; cathode indicated by polarity band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SZBZX84C22ET1G, BZX84C22ET1G omits automotive qualification but matches all electrical parameters, while MMSZ5247B-TP trades smaller size for doubled power rating and lacks automotive validation - making SZBZX84C22ET1G optimal for space-constrained, thermally limited, and automotive-compliant designs.

Availability

SZBZX84C22ET1G is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical monitors, and industrial I/O protection circuits requiring stable component supply, long-term lifecycle assurance, and AEC-Q101 compliance.

Supply support for SZBZX84C22ET1G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

SZBZX84C22ET1G belongs to the BZX84CxxxET1G/SZBZX84CxxxET1G series - engineered for compact, reliable voltage regulation in high-density portable and automotive electronics where space, thermal budget, and qualification rigor are critical.

FAQ

What is the Zener voltage tolerance of SZBZX84C22ET1G at 20 mA test current?

The SZBZX84C22ET1G has a Zener voltage range of 20.8 V to 23.3 V at 20 mA test current, corresponding to a ±1.1 V absolute tolerance around the nominal 22 V rating. This tolerance reflects manufacturing spread and must be accounted for in reference accuracy budgets. The SZBZX84C22ET1G datasheet specifies this range under standard test conditions (TA = 25 °C), and actual performance remains within these bounds across its qualified operating temperature range.

Is SZBZX84C22ET1G suitable for automotive applications?

Yes, SZBZX84C22ET1G is AEC-Q101 qualified and PPAP capable, explicitly designed for automotive use cases such as body control modules, sensor interfaces, and infotainment power supervision. Its construction meets automotive reliability standards including temperature cycling, humidity testing, and mechanical shock requirements. The SZBZX84C22ET1G also features an extended junction temperature range (−65 °C to +150 °C) and HBM Class 3 ESD robustness (>16 kV), confirming suitability for under-hood and cabin-mounted systems.

What is the maximum reverse leakage current for SZBZX84C22ET1G?

The maximum reverse leakage current for SZBZX84C22ET1G is 50 nA at VR = 17.6 V (80% of nominal VZ), measured at TA = 25 °C. This value is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet. At higher temperatures or voltages, leakage increases - for example, up to 200 nA may occur at 125 °C ambient. Designers should verify leakage impact on high-impedance reference nodes when using SZBZX84C22ET1G in precision circuits.

Does SZBZX84C22ET1G have a connected pin 2?

No, pin 2 of SZBZX84C22ET1G is internally unconnected (NC), as confirmed in the marking diagram and mechanical outline on page 6 of the datasheet (Style 8). It must remain electrically floating on the PCB - no trace, via, or copper pour should contact this pad. Connecting pin 2 risks internal shorting or parametric shift. The functional terminals are pin 1 (anode) and pin 3 (cathode), with polarity identified by the cathode band adjacent to pin 3.

What is the thermal resistance of SZBZX84C22ET1G on FR-5 board?

The thermal resistance, junction-to-ambient (R_JA), for SZBZX84C22ET1G is 500 °C/W when mounted on an FR-5 board per the Maximum Ratings table on page 1 of the datasheet. This value assumes standard JEDEC test conditions (1.0 × 0.75 × 0.62 inch board). At 250 mW dissipation, this yields a theoretical junction-to-ambient temperature rise of 125 °C - so ambient must stay ≤25 °C to avoid exceeding the +150 °C max junction limit. For higher ambient, thermal relief pads or copper pours are recommended to reduce effective R_JA.