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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

onsemi SZMM3Z22VT1G

Name: SZMM3Z22VT1G
Brand: onsemi
SKU: SZMM3Z22VT1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZMM3Z22VT1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: SZMM3Z22VT1G.pdf

Description:: DIODE ZENER 22V 300MW SOD323

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SZMM3Z22VT1G from onsemi is a 22 V, 300 mW Zener voltage regulator diode in SOD−323 package, designed for precision voltage reference and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 22 V at 5 mA test current, with dynamic impedance of 55 Ω, ±5% tolerance, and −2.0 mV/°C temperature coefficient. It is used in voltage clamping for USB power rails and ESD-protected I/O interfaces.

For engineers reviewing the SZMM3Z22VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, low leakage (≤0.05 µA at 15.4 V), thermal stability, SOD−323 footprint compatibility, and AEC−Q101 qualification for automotive subsystems.

Technical Context

This device operates as a two-terminal, reverse-biased silicon junction diode optimized for stable breakdown regulation. Its 22 V nominal Zener voltage is specified at IZT = 5 mA, with ZZT = 55 Ω and ZZK = 100 Ω at IZK = 0.5 mA, supporting both precision reference and transient suppression roles.

It features Class 3 ESD robustness (>16 kV HBM), Pb-free SOD−323 packaging with 0.9 mm height and 1.7 mm × 1.25 mm footprint, and is rated for junction temperatures from −65°C to +150°C with 416°C/W thermal resistance to ambient on FR-4 board.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	20.8 V min / 22 V nom / 23.3 V max @ I_ZT = 5 mA - defines clamping threshold with ±5% tolerance
Zener Impedance (Z_ZT)	55 Ω max @ I_ZT = 5 mA - ensures minimal voltage shift under load variation
Power Dissipation	300 mW @ T_A = 25°C - supports continuous regulation in compact PCB layouts
Leakage Current (I_R)	≤0.05 µA @ V_R = 15.4 V - enables low-power standby operation without parasitic drain
Temperature Coefficient	−2.0 mV/°C - quantifies voltage drift across industrial temperature range
Capacitance	20 pF @ V_R = 0 V, f = 1 MHz - limits high-frequency signal coupling in RF-adjacent traces
ESD Rating	Class 3 (>16 kV) per HBM - provides intrinsic I/O line robustness without external TVS

Pinout & Package

SOD−323 surface-mount package: 1.7 mm × 1.25 mm body, 0.9 mm height, cathode indicated by polarity band. Weight: 4.507 mg/unit. Mounting position: any.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Zener breakdown terminal	Connected to regulated node; voltage referenced to anode; polarity band identifies this terminal
2 (Anode)	Reference/ground terminal	Typically tied to system ground or lower-potential rail; completes reverse-bias path

Key Features

Feature	Design Value
AEC−Q101 qualified	Validated for automotive electronics including infotainment power supplies and sensor bias networks
Low-profile SOD−323	Enables placement beneath connectors or in 0.4 mm pitch BGA escape zones without height interference
16 kV HBM ESD rating	Reduces need for discrete ESD protection on low-speed analog or digital I/O lines
−65°C to +150°C operating range	Supports under-hood automotive modules and industrial motor drive control boards
Pb-free construction	Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements

Applications

USB Power Rail Clamping	Automotive Sensor Bias Reference
Use Scenario: Protecting 5 V USB VBUS lines from transient overvoltage during hot-plug or ESD events. IC Role / Device Role / Timing Role: Zener clamp placed between VBUS and GND to shunt excess energy above 22 V threshold. Use Value: Limits peak voltage to ≤23.3 V, preventing damage to USB controller ICs rated for 24 V absolute maximum.	Use Scenario: Providing stable 22 V bias to Hall-effect position sensors in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference source ensuring consistent sensor output scaling across temperature. Use Value: −2.0 mV/°C tempco maintains <±0.22 V drift from −40°C to +125°C, meeting ASIL-B functional safety margin.
High-Density PC Board Voltage Monitoring	Portable Device Battery Protection
Use Scenario: Monitoring 24 V supply rails on telecom line cards where board area is constrained. IC Role / Device Role / Timing Role: Zener-based comparator input reference for undervoltage/overvoltage detection circuitry. Use Value: 20.8–23.3 V tolerance window enables reliable trip-point setting without trimming resistors.	Use Scenario: Overvoltage cutoff in lithium-ion battery charging circuits for handheld medical devices. IC Role / Device Role / Timing Role: Shunt regulator that triggers charge controller shutdown when cell stack exceeds safe limit. Use Value: 0.05 µA leakage at 15.4 V prevents measurable self-discharge during multi-week standby periods.

USB Power Rail Clamping

Automotive Sensor Bias Reference

Use Scenario: Protecting 5 V USB VBUS lines from transient overvoltage during hot-plug or ESD events.

IC Role / Device Role / Timing Role: Zener clamp placed between VBUS and GND to shunt excess energy above 22 V threshold.

Use Value: Limits peak voltage to ≤23.3 V, preventing damage to USB controller ICs rated for 24 V absolute maximum.

Use Scenario: Providing stable 22 V bias to Hall-effect position sensors in engine control units.

IC Role / Device Role / Timing Role: Precision voltage reference source ensuring consistent sensor output scaling across temperature.

Use Value: −2.0 mV/°C tempco maintains <±0.22 V drift from −40°C to +125°C, meeting ASIL-B functional safety margin.

High-Density PC Board Voltage Monitoring

Portable Device Battery Protection

Use Scenario: Monitoring 24 V supply rails on telecom line cards where board area is constrained.

IC Role / Device Role / Timing Role: Zener-based comparator input reference for undervoltage/overvoltage detection circuitry.

Use Value: 20.8–23.3 V tolerance window enables reliable trip-point setting without trimming resistors.

Use Scenario: Overvoltage cutoff in lithium-ion battery charging circuits for handheld medical devices.

IC Role / Device Role / Timing Role: Shunt regulator that triggers charge controller shutdown when cell stack exceeds safe limit.

Use Value: 0.05 µA leakage at 15.4 V prevents measurable self-discharge during multi-week standby periods.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B22,115	Same 22 V nominal Zener, but 300 mW rating in SOD-323; higher leakage (≤100 nA @ 17.6 V) and no AEC-Q101 qualification	Targeted at commercial-grade consumer electronics, not automotive or industrial environments	Select when cost sensitivity outweighs automotive compliance and ultra-low leakage requirements
MMSZ5247B-TP	22 V Zener in SOD-123 package (larger: 2.7 mm × 1.6 mm); 500 mW rating; ±5% tolerance; no AEC-Q101 or HBM >16 kV rating	Suitable for non-space-constrained designs requiring higher power dissipation headroom	Choose when PCB layout allows larger footprint and thermal margin exceeds 300 mW requirement

Compared with BZX384-B22,115 and MMSZ5247B-TP, SZMM3Z22VT1G uniquely combines AEC−Q101 qualification, 16 kV HBM ESD robustness, and ultra-low 0.05 µA leakage in the smallest SOD−323 form factor-making it optimal for automotive I/O protection and battery-powered precision references.

Availability

SZMM3Z22VT1G is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor interfaces, and portable medical device power management requiring stable component supply and full traceability.

Supply support for SZMM3Z22VT1G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

SZMM3ZxxxT1G series belongs to onsemi's precision Zener regulator portfolio, engineered specifically for AEC−Q101-compliant voltage reference and clamping in space- and reliability-critical automotive subsystems.

FAQ

What is the Zener voltage tolerance of SZMM3Z22VT1G?

SZMM3Z22VT1G has a nominal Zener voltage of 22 V with minimum 20.8 V and maximum 23.3 V at I_ZT = 5 mA, corresponding to ±5% tolerance. This tolerance is guaranteed across the full operating temperature range and is verified per AEC−Q101 stress testing protocols. The SZMM3Z22VT1G datasheet specifies these limits in the Electrical Characteristics table on page 2.

Is SZMM3Z22VT1G suitable for automotive applications?

Yes, SZMM3Z22VT1G is AEC−Q101 qualified and PPAP capable, with manufacturing site and process controls meeting automotive quality requirements. Its −65°C to +150°C operating range, 16 kV HBM ESD rating, and Pb-free SOD−323 packaging make it appropriate for engine control, body electronics, and ADAS sensor biasing. The "SZ" prefix explicitly denotes automotive-grade variants of the MM3Z series.

What is the maximum power dissipation for SZMM3Z22VT1G at 85°C ambient?

At T_A = 85°C, SZMM3Z22VT1G's power dissipation must be derated linearly from 300 mW at 25°C using the 2.4 mW/°C derating factor. This yields 300 mW − (85 − 25) × 2.4 mW = 156 mW maximum continuous dissipation. Thermal resistance R_JA = 416°C/W confirms this calculation aligns with junction temperature limits.

Does SZMM3Z22VT1G have a defined forward voltage specification?

Yes, SZMM3Z22VT1G specifies V_F ≤ 0.9 V at I_F = 10 mA, per the Electrical Characteristics table. This forward voltage is relevant when the device is used in bidirectional protection schemes or during power-up sequencing where forward conduction may occur. The parameter is measured at T_A = 25°C and applies across all variants in the SZMM3ZxxxT1G series.

How is polarity identified on the SZMM3Z22VT1G SOD−323 package?

SZMM3Z22VT1G uses a cathode-indicating polarity band on the SOD−323 case, located adjacent to Pin 1 (cathode). The marking "10" appears on the device body per the datasheet's Device Marking Information table. Orientation follows standard SOD−323 conventions: cathode (band) left, anode right, when viewed top-down with marking readable left-to-right.

SZMM3Z22VT1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 22 V

Tolerance:: ±5%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 55 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 15.4 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

SZMM3Z22VT1G FAQ

1.How can I place an order for SZMM3Z22VT1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZMM3Z22VT1G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SZMM3Z22VT1G reliable?

The price and inventory of SZMM3Z22VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z22VT1G is usually 5 days.

3.What payment methods are accepted for SZMM3Z22VT1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z22VT1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZMM3Z22VT1G?

SZMM3Z22VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZMM3Z22VT1G order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SZMM3Z22VT1G?

For technical support, including SZMM3Z22VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z22VT1G requirements.

6.How does Aetrix verify that SZMM3Z22VT1G is sourced from the original manufacturer or authorized distributors?

All SZMM3Z22VT1G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SZMM3Z22VT1G meets industry standards.

7.What is the process for return or replacement of SZMM3Z22VT1G?

All SZMM3Z22VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z22VT1G, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SZMM3Z22VT1G part is unused and in its original packaging.

Return procedure for SZMM3Z22VT1G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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