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

onsemi MMSZ22T1

Name: MMSZ22T1
Brand: onsemi
SKU: MMSZ22T1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMSZ22T1

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: MMSZ22T1.pdf

Description:: DIODE ZENER 22V 500MW SOD123

Quantity:: RFQ Add To RFQ list

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Inventory:2,041

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Product details

Overview

MMSZ22T1G from onsemi is a 22 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 250 Ω dynamic impedance at 5 mA and 0.05 μA reverse leakage at 15.4 V, used for precision voltage reference and overvoltage protection in power supply rails.

For engineers reviewing the MMSZ22T1G 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 and industrial voltage regulation designs.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across load variations and temperature shifts. Its nominal 22 V Zener voltage is specified at I_ZT = 5 mA with ±5% tolerance, and exhibits a positive temperature coefficient near 22 V - typical of mid-voltage Zeners - enabling predictable drift compensation in reference circuits.

Thermal design requires attention: R_JA = 340°C/W and R_JL = 150°C/W define junction-to-ambient and junction-to-lead resistance, while power derating begins above 75°C at 6.7 mW/°C. The device supports automated assembly per SOD−123 mechanical outline (1.60 × 2.69 × 1.16 mm) and meets UL 94 V−0 flammability rating.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	20.9–23.1 V at I_ZT = 5 mA; ensures stable 22 V reference under nominal bias with ±5% manufacturing tolerance.
Power Dissipation (P_D)	500 mW on FR−5 board at T_L = 75°C; defines maximum continuous power handling before thermal shutdown or degradation.
Zener Impedance (Z_ZT)	250 Ω max at I_ZT = 5 mA, 1 kHz AC signal; determines voltage regulation stiffness under dynamic load changes.
Reverse Leakage (I_R)	0.05 μA max at V_R = 15.4 V; guarantees minimal quiescent current draw in standby or high-impedance sensing nodes.
ESD Rating	Class 3 (>16 kV) per Human Body Model; enables robust handling in automated SMT lines without special ESD controls.
Operating Temperature	−55°C to +150°C junction/storage range; supports under-hood automotive and industrial environments.

Pinout & Package

SOD−123 plastic surface-mount package (Case 425, Style 1), 1.60 × 2.69 × 1.16 mm, cathode indicated by polarity band. Lead-free (Pb−Free) construction, UL 94 V−0 rated, void-free thermosetting case with corrosion-resistant finish.

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

Key Features

Feature	Design Value
500 mW Power Rating	Enables use in medium-power voltage clamping and reference applications without heatsinking on standard PCBs.
AEC−Q101 Qualified	Validated for automotive electronics including body control modules and infotainment power supplies.
Small SOD−123 Footprint	Supports high-density layouts in space-constrained consumer and portable devices.
Class 3 ESD Robustness	Eliminates need for external ESD protection in final assembly, reducing BOM count and test complexity.

Applications

Automotive Power Rail Protection	Industrial Sensor Reference
Use Scenario: Clamping transients on 24 V battery-supplied ECUs during load dump events. IC Role / Device Role / Timing Role: Zener diode providing overvoltage protection by shunting excess energy to ground when rail exceeds 22 V. Use Value: Limits peak voltage to ≤23.1 V with 250 Ω dynamic impedance, preventing damage to downstream 24 V-rated microcontrollers and CAN transceivers.	Use Scenario: Providing stable 22 V reference for analog front-end amplifiers in pressure or temperature sensors. IC Role / Device Role / Timing Role: Precision voltage reference element establishing known bias point for ratiometric ADC measurements. Use Value: Delivers <0.05 μA leakage at 15.4 V, minimizing error contribution in high-impedance sensor bridges and ensuring accuracy over −40°C to +125°C.
Consumer Device Voltage Clamp	Medical Diagnostic Power Monitor
Use Scenario: Protecting USB-C PD negotiation circuitry from accidental 20 V adapter overvoltage. IC Role / Device Role / Timing Role: Standby-mode Zener clamp absorbing short-duration surges without triggering system reset. Use Value: Maintains regulation within ±5% across temperature with 340°C/W thermal resistance, enabling reliable operation in compact enclosures.	Use Scenario: Monitoring auxiliary 22 V supply integrity in portable ultrasound imaging units. IC Role / Device Role / Timing Role: Voltage supervisor reference for comparator-based undervoltage lockout (UVLO) detection. Use Value: Operates reliably from −55°C to +150°C and passes AEC−Q101 stress tests, meeting IEC 60601-1 safety margin requirements.

Automotive Power Rail Protection

Industrial Sensor Reference

Use Scenario: Clamping transients on 24 V battery-supplied ECUs during load dump events.

IC Role / Device Role / Timing Role: Zener diode providing overvoltage protection by shunting excess energy to ground when rail exceeds 22 V.

Use Value: Limits peak voltage to ≤23.1 V with 250 Ω dynamic impedance, preventing damage to downstream 24 V-rated microcontrollers and CAN transceivers.

Use Scenario: Providing stable 22 V reference for analog front-end amplifiers in pressure or temperature sensors.

IC Role / Device Role / Timing Role: Precision voltage reference element establishing known bias point for ratiometric ADC measurements.

Use Value: Delivers <0.05 μA leakage at 15.4 V, minimizing error contribution in high-impedance sensor bridges and ensuring accuracy over −40°C to +125°C.

Consumer Device Voltage Clamp

Medical Diagnostic Power Monitor

Use Scenario: Protecting USB-C PD negotiation circuitry from accidental 20 V adapter overvoltage.

IC Role / Device Role / Timing Role: Standby-mode Zener clamp absorbing short-duration surges without triggering system reset.

Use Value: Maintains regulation within ±5% across temperature with 340°C/W thermal resistance, enabling reliable operation in compact enclosures.

Use Scenario: Monitoring auxiliary 22 V supply integrity in portable ultrasound imaging units.

IC Role / Device Role / Timing Role: Voltage supervisor reference for comparator-based undervoltage lockout (UVLO) detection.

Use Value: Operates reliably from −55°C to +150°C and passes AEC−Q101 stress tests, meeting IEC 60601-1 safety margin requirements.

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 (600 Ω).	Lower power handling limits use in high-current clamping; smaller footprint may ease layout but reduces thermal mass.	Select when board space is critical and peak power remains below 300 mW.
MMSZ22ET1G	Identical SOD−123 package and 22 V rating, but ±2% tolerance (vs. ±5%) and tighter V_Z spread (21.4–22.6 V).	Higher precision required in metrology-grade references or calibration circuits where 5% variation is unacceptable.	Choose for applications demanding tighter voltage accuracy without changing PCB layout.

Compared with MMSZ22T1G, BZX84-C22LT1G offers smaller size but reduced power and higher impedance, while MMSZ22ET1G provides tighter tolerance at same package and power - enabling trade-offs between cost, precision, and thermal performance.

Availability

MMSZ22T1G is available at Aetrix Electronics and suitable for automotive power protection, industrial sensor reference, and medical diagnostic equipment requiring stable component supply with AEC−Q101 qualification and Pb−Free compliance.

Supply support for MMSZ22T1G 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, and consumer markets.

The MMSZxxxT1G series was designed specifically for surface-mount voltage regulation and transient suppression in space-constrained, high-reliability applications - emphasizing AEC−Q101 qualification, ESD robustness, and tight thermal performance control.

FAQ

What is the Zener voltage tolerance for MMSZ22T1G?

MMSZ22T1G 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 MMSZ22T1G.

Is MMSZ22T1G qualified for automotive applications?

Yes, MMSZ22T1G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications such as body control modules, lighting drivers, and power supply supervision. The device undergoes stress testing per AEC−Q101 standards, and its SOD−123 package supports reflow soldering compatible with automotive manufacturing processes - all verified in the onsemi MMSZ22T1G datasheet.

What is the maximum reverse leakage current for MMSZ22T1G?

The maximum reverse leakage current for MMSZ22T1G is 0.05 μA at V_R = 15.4 V and T_A = 25°C, as specified in the Electrical Characteristics table. This low leakage ensures minimal parasitic current draw in high-impedance reference or monitoring circuits, preserving accuracy and battery life in portable systems using MMSZ22T1G.

Does MMSZ22T1G have Pb−Free packaging?

Yes, MMSZ22T1G is supplied in a Pb−Free (RoHS-compliant) SOD−123 package, indicated by the "G" suffix in the part number and confirmed in the Ordering Information section of the onsemi datasheet. The device uses lead-free terminations and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for surface-mount assembly.

What is the thermal resistance of MMSZ22T1G?

MMSZ22T1G has a junction-to-ambient thermal resistance (R_JA) of 340°C/W and junction-to-lead resistance (R_JL) of 150°C/W, measured via infrared scan method on FR−5 board. These values define its thermal performance envelope and inform derating calculations - for example, power must be reduced by 6.7 mW/°C above 75°C ambient, as documented in the Maximum Ratings table for MMSZ22T1G.

MMSZ22T1 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

MMSZ22T1 FAQ

1.How can I place an order for MMSZ22T1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMSZ22T1 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 MMSZ22T1 reliable?

The price and inventory of MMSZ22T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ22T1 is usually 5 days.

3.What payment methods are accepted for MMSZ22T1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ22T1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMSZ22T1?

MMSZ22T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMSZ22T1 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 MMSZ22T1?

For technical support, including MMSZ22T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ22T1 requirements.

6.How does Aetrix verify that MMSZ22T1 is sourced from the original manufacturer or authorized distributors?

All MMSZ22T1 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 MMSZ22T1 meets industry standards.

7.What is the process for return or replacement of MMSZ22T1?

All MMSZ22T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ22T1, 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 MMSZ22T1 part is unused and in its original packaging.

Return procedure for MMSZ22T1:

1.Submit a request within 90 days.

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

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