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

onsemi MMSZ22T3G

Name: MMSZ22T3G
Brand: onsemi
SKU: MMSZ22T3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMSZ22T3G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: MMSZ22T3G.pdf

Description:: DIODE ZENER 22V 500MW SOD123

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Product details

Overview

MMSZ22T3G from onsemi is a 22 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C ambient, with 55 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 15.4 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power management circuits.

For engineers reviewing the MMSZ22T3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, AEC−Q101 qualification status, ESD robustness (Class 3, >16 kV HBM), and direct alternatives for automotive, industrial sensing, and portable power supply designs.

Technical Context

The MMSZ22T3G operates as a two-terminal silicon Zener diode optimized for stable reverse-bias voltage regulation. Its nominal 22 V Zener voltage is specified at I_ZT = 5 mA with ±5% tolerance, and exhibits a positive temperature coefficient above ~6 V, typical for mid-voltage Zeners in this family.

Thermal performance is defined by R_JA = 340°C/W and R_JL = 150°C/W, supporting operation from −55°C to +150°C junction temperature. The device meets AEC−Q101 stress testing requirements and carries Pb−Free (G-suffix) compliance with UL 94 V−0 flammability rating.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	20.9–23.1 V @ I_ZT = 5 mA; enables precise 22 V reference or clamping in 24 V rail monitoring.
Power Dissipation (P_D)	500 mW @ T_L = 75°C; derates linearly at 6.7 mW/°C above 75°C for thermal design margining.
Zener Impedance (Z_ZT)	55 Ω max @ I_ZT = 5 mA; ensures stable regulation under small-signal load transients.
Reverse Leakage (I_R)	0.05 μA max @ V_R = 15.4 V; guarantees minimal quiescent current in battery-backed circuits.
ESD Rating	Class 3 (>16 kV) per HBM; supports robust handling in automated SMT assembly without added protection.
Package	SOD−123 (1.60 × 2.69 × 1.16 mm); compatible with high-density PCB layouts and standard reflow profiles.
AEC−Q101 Qualified	Yes; validated for automotive electronics requiring extended reliability and PPAP documentation.

Pinout & Package

SOD−123 surface-mount package with cathode indicated by polarity band; 2-terminal configuration optimized for automated placement and IR reflow.

Pin/Terminal	Circuit Role	Design Meaning
1 (Banded End)	Cathode	Connected to regulated output node or voltage reference point; reverse-biased during regulation.
2 (Non-banded End)	Anode	Connected to ground or lower-potential rail; completes Zener conduction path.

Key Features

Feature	Design Value
500 mW Power Rating on FR-5 Board	Supports sustained regulation in compact power rails without heatsinking in most consumer and industrial applications.
±5% Zener Voltage Tolerance	Ensures predictable clamping thresholds across production lots-critical for overvoltage protection in 24 V systems.
ESD Robustness (Class 3, >16 kV HBM)	Eliminates need for external ESD protection in board-level interfaces exposed to handling or connector mating.
Pb-Free and UL 94 V-0 Compliant	Meets RoHS and safety standards for global deployment in medical, automotive, and industrial end equipment.
AEC-Q101 Qualification	Validates long-term reliability under automotive temperature cycling, humidity, and mechanical stress conditions.

Applications

Automotive Body Control Module (BCM)	Industrial Sensor Signal Conditioning
Use Scenario: Clamping 24 V supply rail transients in door module microcontroller power domains. IC Role / Device Role / Timing Role: Zener voltage clamp protecting LDO input and MCU V_DD pins from load-dump spikes. Use Value: Prevents brownout resets and latch-up events using only a single 22 V-rated diode with <0.05 μA leakage.	Use Scenario: Providing stable 22 V reference for 4–20 mA transmitter loop-powered sensors. IC Role / Device Role / Timing Role: Precision shunt reference establishing bias point for op-amp current source circuitry. Use Value: Delivers ±5% accuracy and 55 Ω dynamic impedance to maintain loop linearity across temperature.
Portable Medical Device Power Management	Smart Home Hub Overvoltage Protection
Use Scenario: Regulating auxiliary 22 V rail for piezoelectric actuator driver ICs in handheld diagnostics tools. IC Role / Device Role / Timing Role: Low-leakage shunt regulator maintaining stable bias under intermittent battery discharge. Use Value: Enables >10-year shelf life via 0.05 μA max reverse leakage at 15.4 V, minimizing standby drain.	Use Scenario: Protecting USB-C PD negotiation ICs from accidental 24 V adapter misconnection. IC Role / Device Role / Timing Role: Primary overvoltage clamp limiting input to 23.1 V before secondary TVS activation. Use Value: Adds fail-safe layer with fast response (<1 ms), no latency, and no control logic overhead.

Automotive Body Control Module (BCM)

Industrial Sensor Signal Conditioning

Use Scenario: Clamping 24 V supply rail transients in door module microcontroller power domains.

IC Role / Device Role / Timing Role: Zener voltage clamp protecting LDO input and MCU V_DD pins from load-dump spikes.

Use Value: Prevents brownout resets and latch-up events using only a single 22 V-rated diode with <0.05 μA leakage.

Use Scenario: Providing stable 22 V reference for 4–20 mA transmitter loop-powered sensors.

IC Role / Device Role / Timing Role: Precision shunt reference establishing bias point for op-amp current source circuitry.

Use Value: Delivers ±5% accuracy and 55 Ω dynamic impedance to maintain loop linearity across temperature.

Portable Medical Device Power Management

Smart Home Hub Overvoltage Protection

Use Scenario: Regulating auxiliary 22 V rail for piezoelectric actuator driver ICs in handheld diagnostics tools.

IC Role / Device Role / Timing Role: Low-leakage shunt regulator maintaining stable bias under intermittent battery discharge.

Use Value: Enables >10-year shelf life via 0.05 μA max reverse leakage at 15.4 V, minimizing standby drain.

Use Scenario: Protecting USB-C PD negotiation ICs from accidental 24 V adapter misconnection.

IC Role / Device Role / Timing Role: Primary overvoltage clamp limiting input to 23.1 V before secondary TVS activation.

Use Value: Adds fail-safe layer with fast response (<1 ms), no latency, and no control logic overhead.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C22LT1G	Same 22 V nominal Zener, but 300 mW rating and SOT-23 package; higher Z_ZT (100 Ω).	Lower power handling limits use in continuous-clamp scenarios; smaller footprint may ease layout in space-constrained designs.	Select when board area is critical and peak power remains below 300 mW.
SZMMSZ22T3G	Identical electrical specs and package; differs only in SZ-prefix denoting automotive-specific traceability and change control.	Required for Tier-1 automotive BOMs needing PPAP documentation and site-controlled manufacturing.	Choose for OEM automotive programs where AEC-Q101 compliance must be explicitly tracked per lot.

Compared with BZX84-C22LT1G, MMSZ22T3G offers +67% power headroom and lower impedance for more stable regulation; compared with SZMMSZ22T3G, it shares identical performance but omits automotive traceability-making it optimal for industrial and commercial applications where cost and availability are prioritized.

Availability

MMSZ22T3G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor transmitters, portable medical devices, and smart home hub protection circuits requiring stable component supply and AEC−Q101 assurance.

Supply support for MMSZ22T3G 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, and medical applications.

The MMSZxxxT1G series was engineered for high-reliability, surface-mount Zener regulation in space-constrained and thermally demanding environments-targeting automotive ECUs, industrial IoT nodes, and portable electronics.

FAQ

What is the Zener voltage tolerance of MMSZ22T3G?

The MMSZ22T3G has a nominal Zener voltage of 22 V with a standard tolerance of ±5%, meaning its actual reverse breakdown voltage falls between 20.9 V and 23.1 V when tested at I_ZT = 5 mA and T_A = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet for MMSZ22T3G.

Is MMSZ22T3G qualified for automotive use?

Yes, MMSZ22T3G is AEC−Q101 qualified and PPAP capable, as stated in the Features section of the onsemi datasheet. It undergoes stress testing for temperature cycling, humidity, and mechanical shock required for automotive electronics. While the SZ-prefix variant (SZMMSZ22T3G) adds enhanced traceability for Tier-1 programs, MMSZ22T3G itself meets full AEC−Q101 requirements.

What is the maximum reverse leakage current for MMSZ22T3G?

The maximum reverse leakage current for MMSZ22T3G is 0.05 μA at V_R = 15.4 V and T_A = 25°C, per the Electrical Characteristics table. This ultra-low leakage supports battery-sensitive applications such as portable medical devices and always-on IoT sensors where standby current must be minimized.

Does MMSZ22T3G have Pb-free construction?

Yes, MMSZ22T3G uses Pb-free packaging, indicated by the "G" suffix in its part number and confirmed in the Ordering Information section of the onsemi datasheet. It complies with RoHS Directive 2011/65/EU and supports lead-free reflow soldering up to 260°C for 10 seconds, as specified in the Mechanical Characteristics table.

What is the thermal resistance junction-to-ambient for MMSZ22T3G?

The thermal resistance junction-to-ambient (R_JA) for MMSZ22T3G is 340°C/W, measured per the infrared scan method on FR-5 board, as documented in the Maximum Ratings table. This value guides thermal design when operating near the 500 mW power limit, especially in enclosed or high-ambient-temperature environments.

MMSZ22T3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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

Tolerance:: ±5%

Power - Max:: 500 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:: -55°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123

MMSZ22T3G FAQ

1.How can I place an order for MMSZ22T3G through Aetrix?

Please submit a Request for Quotation (RFQ) for MMSZ22T3G 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 MMSZ22T3G reliable?

The price and inventory of MMSZ22T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ22T3G is usually 5 days.

3.What payment methods are accepted for MMSZ22T3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ22T3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMSZ22T3G?

MMSZ22T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMSZ22T3G 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 MMSZ22T3G?

For technical support, including MMSZ22T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ22T3G requirements.

6.How does Aetrix verify that MMSZ22T3G is sourced from the original manufacturer or authorized distributors?

All MMSZ22T3G 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 MMSZ22T3G meets industry standards.

7.What is the process for return or replacement of MMSZ22T3G?

All MMSZ22T3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ22T3G, 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 MMSZ22T3G part is unused and in its original packaging.

Return procedure for MMSZ22T3G:

1.Submit a request within 90 days.

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

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