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

onsemi MMSZ9V1T1

Name: MMSZ9V1T1
Brand: onsemi
SKU: MMSZ9V1T1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMSZ9V1T1

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: MMSZ9V1T1.pdf

Description:: DIODE ZENER 9.1V 500MW SOD123

Quantity:: RFQ Add To RFQ list

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Inventory:3,038

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Product details

Overview

MMSZ9V1T1G from onsemi is a 500 mW, 9.1 V ±5% Zener diode in SOD−123 package, designed for precision voltage regulation and overvoltage protection in low-power analog and digital circuits. It delivers 15 Ω dynamic impedance at 5 mA, 0.5 μA reverse leakage at 7.2 V, and operates across −55°C to +150°C with AEC−Q101 qualification for automotive-grade reliability.

For engineers reviewing the MMSZ9V1T1G datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), and direct-fit alternatives for voltage reference and clamp design in space-constrained PCBs.

Technical Context

This Zener regulator operates in reverse breakdown mode with tightly controlled nominal voltage of 9.1 V and ±5% tolerance. Its 15 Ω dynamic impedance at I_ZT = 5 mA ensures stable regulation under moderate load transients, while the 0.5 μA reverse leakage at VR = 7.2 V supports low-quiescent-current designs.

The device uses thermoset plastic SOD−123 packaging rated for 260°C/10 s soldering, UL 94 V−0 flammability compliance, and cathode polarity marking. Thermal resistance is 340°C/W (junction-to-ambient) and 150°C/W (junction-to-lead), enabling predictable power dissipation up to 500 mW on FR−5 board at T_L = 75°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	8.65–9.56 V at I_ZT = 5 mA; enables precise 9.1 V reference with ±5% tolerance for feedback loops and sensing.
Dynamic Impedance (Z_ZT)	15 Ω max at I_ZT = 5 mA; minimizes output voltage variation under current load changes.
Reverse Leakage (I_R)	0.5 μA max at V_R = 7.2 V; preserves battery life and signal integrity in high-impedance bias networks.
Power Dissipation (P_D)	500 mW on FR−5 board at T_L = 75°C; supports continuous operation in compact industrial and automotive modules.
Thermal Resistance (R_JA)	340°C/W; defines junction temperature rise per milliwatt-critical for thermal margin calculation in sealed enclosures.
ESD Rating	Class 3 (>16 kV HBM); withstands handling and assembly without protection circuitry in production environments.
Operating Temperature	−55°C to +150°C; qualified for under-hood automotive, industrial control, and outdoor IoT node applications.

Pinout & Package

SOD−123 surface-mount package: 1.60 mm × 2.69 mm × 1.16 mm body with void-free thermoset plastic case, corrosion-resistant finish, and cathode indicated by polarity band. Lead-free (Pb−Free) construction compliant with RoHS.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Zener breakdown terminal	Connected to regulated voltage node; must be held at higher potential than anode during regulation.
2 (Anode)	Reference/ground return	Typically tied to system ground or lower-potential rail; completes reverse-bias path for Zener conduction.

Key Features

Feature	Design Value
500 mW power rating on FR−5 board	Enables use in higher-current clamp and reference roles without external heat sinking in standard PCB layouts.
AEC−Q101 qualification	Validates reliability for automotive electronics including body control modules and sensor interfaces meeting ISO/TS 16949 requirements.
ESD Class 3 (>16 kV HBM)	Eliminates need for discrete ESD protection in front-end voltage rails, reducing BOM count and layout area.
Small SOD−123 footprint	Supports high-density routing in portable medical devices, wearables, and multi-rail power management ICs.
−55°C to +150°C operating range	Permits deployment in engine control units, industrial motor drives, and outdoor telecom infrastructure without derating.

Applications

Automotive Sensor Reference	Industrial ADC Voltage Clamp
Use Scenario: Providing stable 9.1 V reference for analog front-end of pressure or temperature sensors in engine bay modules. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp protecting ADC input against load dump or supply surge. Use Value: Maintains measurement accuracy despite ambient temperature swings from −40°C to +125°C and suppresses transients up to 500 mW without degradation.	Use Scenario: Clamping 12 V supply rail feeding 16-bit SAR ADC in programmable logic controller (PLC) I/O module. IC Role / Device Role / Timing Role: Reverse-biased shunt regulator limiting input voltage to prevent ADC saturation and internal damage. Use Value: 15 Ω Z_ZT ensures <100 mV deviation during 1 mA transient events, preserving 0.01% full-scale linearity.
USB-C Power Negotiation Clamp	IoT Node Battery Monitor Reference
Use Scenario: Protecting CC line voltage translator IC during USB-C PD negotiation where V_CONN may exceed 5.5 V. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp absorbing short-duration spikes on bidirectional communication lines. Use Value: 0.5 μA leakage at 7.2 V prevents false detection during idle states, while 16 kV HBM ESD rating survives repeated hot-plug cycles.	Use Scenario: Generating precise 9.1 V reference for Li-ion battery cell voltage monitoring in wireless sensor nodes. IC Role / Device Role / Timing Role: Low-power Zener reference source feeding resistive divider into microcontroller's internal ADC. Use Value: ±5% V_Z tolerance and −55°C to +150°C operation ensure consistent 1% SoC estimation across storage and field conditions.

Automotive Sensor Reference

Industrial ADC Voltage Clamp

Use Scenario: Providing stable 9.1 V reference for analog front-end of pressure or temperature sensors in engine bay modules.

IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp protecting ADC input against load dump or supply surge.

Use Value: Maintains measurement accuracy despite ambient temperature swings from −40°C to +125°C and suppresses transients up to 500 mW without degradation.

Use Scenario: Clamping 12 V supply rail feeding 16-bit SAR ADC in programmable logic controller (PLC) I/O module.

IC Role / Device Role / Timing Role: Reverse-biased shunt regulator limiting input voltage to prevent ADC saturation and internal damage.

Use Value: 15 Ω Z_ZT ensures <100 mV deviation during 1 mA transient events, preserving 0.01% full-scale linearity.

USB-C Power Negotiation Clamp

IoT Node Battery Monitor Reference

Use Scenario: Protecting CC line voltage translator IC during USB-C PD negotiation where V_CONN may exceed 5.5 V.

IC Role / Device Role / Timing Role: Fast-response overvoltage clamp absorbing short-duration spikes on bidirectional communication lines.

Use Value: 0.5 μA leakage at 7.2 V prevents false detection during idle states, while 16 kV HBM ESD rating survives repeated hot-plug cycles.

Use Scenario: Generating precise 9.1 V reference for Li-ion battery cell voltage monitoring in wireless sensor nodes.

IC Role / Device Role / Timing Role: Low-power Zener reference source feeding resistive divider into microcontroller's internal ADC.

Use Value: ±5% V_Z tolerance and −55°C to +150°C operation ensure consistent 1% SoC estimation across storage and field conditions.

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-C9V1	Same 9.1 V nominal, ±5% tolerance, but SOT-23 package (larger footprint, 350 mW rating)	Higher thermal mass suits higher average power; less suitable for ultra-dense layouts	Select when board space allows larger footprint and thermal budget exceeds 350 mW
MMBZ5240BLT1G	9.1 V nominal, ±5%, SOT-23 package, 350 mW, 20 Ω Z_ZT at 20 mA	Higher test current yields better regulation at higher loads but higher leakage (1 μA @ 7.2 V)	Prefer for medium-current clamping where 20 Ω Z_ZT is acceptable and SOT-23 is already in BOM

Compared with BZX84-C9V1 and MMBZ5240BLT1G, MMSZ9V1T1G offers superior power density (500 mW in SOD−123), lower dynamic impedance at typical bias (15 Ω @ 5 mA), and tighter thermal performance (340°C/W R_JA), making it optimal for miniaturized automotive and industrial designs requiring AEC−Q101 compliance.

Availability

MMSZ9V1T1G is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial ADC protection, USB-C power negotiation circuits, and IoT battery monitoring systems requiring stable component supply with full traceability and lifecycle support.

Supply support for MMSZ9V1T1G 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 MMSZxxxT1G series was developed specifically for high-reliability, space-constrained voltage regulation and transient suppression in automotive ECUs, industrial controllers, and portable electronics-emphasizing AEC−Q101 qualification, low-leakage performance, and robust SOD−123 packaging.

FAQ

What is the Zener voltage tolerance of MMSZ9V1T1G?

The MMSZ9V1T1G has a nominal Zener voltage of 9.1 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 8.65 V and 9.56 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.

Does MMSZ9V1T1G support automotive applications?

Yes, MMSZ9V1T1G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. Its −55°C to +150°C operating range and 16 kV HBM ESD rating meet stringent automotive reliability requirements.

What is the maximum power dissipation for MMSZ9V1T1G on FR−5 board?

MMSZ9V1T1G is rated for 500 mW total power dissipation on FR−5 board at lead temperature (T_L) = 75°C, with linear derating of 6.7 mW/°C above that temperature. This value is specified in the Maximum Ratings table on page 1 of the onsemi datasheet.

How does the dynamic impedance of MMSZ9V1T1G affect regulation stability?

MMSZ9V1T1G exhibits a maximum dynamic impedance (Z_ZT) of 15 Ω at I_ZT = 5 mA, which directly determines how much the output voltage varies with changes in Zener current. Lower Z_ZT improves regulation accuracy-enabling stable 9.1 V references even under moderate load transients in feedback networks.

Is MMSZ9V1T1G RoHS-compliant and lead-free?

Yes, MMSZ9V1T1G is Pb−Free and RoHS-compliant, as indicated by the "G" suffix in its full part number (MMSZ9V1T1G) and confirmed in the Ordering Information section of the onsemi datasheet. The device uses void-free, transfer-molded thermoset plastic packaging with corrosion-resistant, easily solderable finish.

MMSZ9V1T1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 9.1 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 6 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

MMSZ9V1T1 FAQ

1.How can I place an order for MMSZ9V1T1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMSZ9V1T1 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 MMSZ9V1T1 reliable?

The price and inventory of MMSZ9V1T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ9V1T1 is usually 5 days.

3.What payment methods are accepted for MMSZ9V1T1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ9V1T1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMSZ9V1T1?

MMSZ9V1T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMSZ9V1T1 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 MMSZ9V1T1?

For technical support, including MMSZ9V1T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ9V1T1 requirements.

6.How does Aetrix verify that MMSZ9V1T1 is sourced from the original manufacturer or authorized distributors?

All MMSZ9V1T1 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 MMSZ9V1T1 meets industry standards.

7.What is the process for return or replacement of MMSZ9V1T1?

All MMSZ9V1T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ9V1T1, 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 MMSZ9V1T1 part is unused and in its original packaging.

Return procedure for MMSZ9V1T1:

1.Submit a request within 90 days.

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

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