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

onsemi MM3Z8V2ST1

Name: MM3Z8V2ST1
Brand: onsemi
SKU: MM3Z8V2ST1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MM3Z8V2ST1

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: MM3Z8V2ST1.pdf

Description:: DIODE ZENER 8.2V 200MW SOD323

Quantity:: RFQ Add To RFQ list

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Inventory:3,116

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Product details

Overview

MM3Z8V2ST1 from onsemi is a 200 mW, 8.2 V Zener diode in SOD−323 package with ±3.2% tolerance (8.02–8.36 V), 15 Ω dynamic impedance at 5 mA test current, and 0.7 µA reverse leakage at 6.2 V. It provides precision voltage regulation for low-power signal conditioning and ESD-protected bias networks in space-constrained portable electronics.

For engineers reviewing the MM3Z8V2ST1 datasheet, pinout, applications, or equivalent options, this device serves as a tight-tolerance, Pb-free surface-mount Zener regulator optimized for stable reference generation, overvoltage clamping, and low-capacitance (<135 pF) signal-line protection in high-density PCBs.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal 8.2 V regulation voltage at I_ZT = 5 mA. Its thermal resistance of 635°C/W and derating slope of 1.5 mW/°C above 25°C define its power handling limits on FR-4 boards.

The device features Class 3 ESD robustness (>16 kV HBM), UL 94 V-0 flammability rating, and a cathode-indicated polarity band. Its 1.7 mm × 1.25 mm × 0.9 mm footprint enables integration into hand-held portables and cellular phone power rails where board area is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	8.02–8.36 V at I_ZT = 5 mA - defines stable regulation window for reference or clamp circuits
Power Dissipation	200 mW at T_A = 25°C - sets maximum continuous DC power under standard board conditions
Zener Impedance (Z_ZT)	15 Ω max at I_ZT = 5 mA - determines AC regulation stability and ripple rejection capability
Reverse Leakage (I_R)	0.7 µA max at V_R = 6.2 V - ensures minimal quiescent current in standby-biased protection networks
Capacitance	135 pF max at V_R = 0 V, f = 1 MHz - limits high-frequency loading on signal lines and clock paths
ESD Rating	Class 3 (>16 kV) per HBM - supports robustness in handheld and USB-connected interfaces without external TVS
Package	SOD−323 (Case 477) - 1.7 mm × 1.25 mm footprint with 0.9 mm height for ultra-dense layouts

Pinout & Package

SOD−323 package: 2-terminal surface-mount device with cathode marked by band; body dimensions 1.70 mm × 1.25 mm × 0.90 mm; lead finish Pb−Sn or Sn-only (Pb−free option available).

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

Key Features

Feature	Design Value
Tight Zener tolerance	±3.2% (8.02–8.36 V) - enables accurate voltage references without post-production trimming
Low-profile SOD−323	0.9 mm height - allows stacking under connectors or beneath shields in slim mobile designs
High ESD immunity	>16 kV HBM - eliminates need for discrete ESD diodes in many I/O protection schemes
Pb−free compatibility	RoHS-compliant Sn-only plating - meets global environmental compliance without solderability trade-offs
Stable temperature coefficient	+3.2 mV/°C at I_ZT = 5 mA - predictable drift behavior simplifies thermal compensation in precision analog stages

Applications

Cellular Phone Power Rails	USB Interface Clamping
Use Scenario: Regulating bias voltage for RF front-end LNA and PA enable circuits in LTE/5G handsets. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp protecting 3.3 V or 5 V supply domains. Use Value: 8.2 V breakdown prevents damage from transient coupling while maintaining <135 pF loading on sensitive RF traces.	Use Scenario: Protecting D+ and D− lines against ESD events in Type-A and Type-C receptacles. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp referenced to V_CONN or ground. Use Value: Class 3 HBM rating and 0.7 µA leakage at 6.2 V ensure signal integrity and low standby current in always-on USB detection logic.
Portable Medical Sensor Bias	Industrial IoT Node Reference
Use Scenario: Providing stable excitation voltage for MEMS pressure and temperature sensors in wearable health monitors. IC Role / Device Role / Timing Role: Precision shunt reference for ADC input scaling and sensor bridge biasing. Use Value: ±3.2% tolerance and 15 Ω Z_ZT ensure <0.5% full-scale error contribution across 0–50°C ambient range.	Use Scenario: Generating local 8.2 V reference for isolated RS-485 transceiver bias and microcontroller brown-out detection. IC Role / Device Role / Timing Role: Standalone shunt regulator feeding secondary LDO input or supervisor IC threshold. Use Value: 200 mW rating and 635°C/W R_JA allow operation up to +85°C ambient without derating in sealed enclosures.

Cellular Phone Power Rails

USB Interface Clamping

Use Scenario: Regulating bias voltage for RF front-end LNA and PA enable circuits in LTE/5G handsets.

IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp protecting 3.3 V or 5 V supply domains.

Use Value: 8.2 V breakdown prevents damage from transient coupling while maintaining <135 pF loading on sensitive RF traces.

Use Scenario: Protecting D+ and D− lines against ESD events in Type-A and Type-C receptacles.

IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp referenced to V_CONN or ground.

Use Value: Class 3 HBM rating and 0.7 µA leakage at 6.2 V ensure signal integrity and low standby current in always-on USB detection logic.

Portable Medical Sensor Bias

Industrial IoT Node Reference

Use Scenario: Providing stable excitation voltage for MEMS pressure and temperature sensors in wearable health monitors.

IC Role / Device Role / Timing Role: Precision shunt reference for ADC input scaling and sensor bridge biasing.

Use Value: ±3.2% tolerance and 15 Ω Z_ZT ensure <0.5% full-scale error contribution across 0–50°C ambient range.

Use Scenario: Generating local 8.2 V reference for isolated RS-485 transceiver bias and microcontroller brown-out detection.

IC Role / Device Role / Timing Role: Standalone shunt regulator feeding secondary LDO input or supervisor IC threshold.

Use Value: 200 mW rating and 635°C/W R_JA allow operation up to +85°C ambient without derating in sealed enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B8V2,115	Same 8.2 V nominal, ±2% tolerance, but 300 mW rating and SOD-323 package with different marking and thermal resistance (500°C/W)	Higher power margin supports higher I_Z in active regulation loops; tighter tolerance improves accuracy-critical references	Select when >200 mW dissipation or <±2% tolerance is required; verify layout compatibility with alternate cathode marking
MMSZ5238B-TP	8.2 V nominal, ±5% tolerance, 500 mW rating, SOD-123 package (larger: 2.7 mm × 1.4 mm), 300°C/W R_JA	Larger footprint accommodates higher thermal mass; looser tolerance acceptable for non-critical clamping	Choose for cost-sensitive industrial designs where board space permits larger package and ±5% regulation is sufficient

Compared with BZX384-B8V2,115 and MMSZ5238B-TP, the MM3Z8V2ST1 offers optimal balance of tight tolerance, compact size, and ESD robustness for portable electronics-making it preferred where board area, accuracy, and reliability are jointly constrained.

Availability

MM3Z8V2ST1 is available at Aetrix Electronics and suitable for cellular phone power rails, USB interface clamping, and portable medical sensor bias requiring stable component supply and RoHS-compliant sourcing.

Supply support for MM3Z8V2ST1 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, and intelligent edge applications.

The MM3ZxxxST1 series is part of onsemi's precision Zener portfolio designed specifically for space-constrained, high-reliability voltage regulation and ESD protection in portable and battery-powered systems.

FAQ

What is the Zener voltage tolerance of MM3Z8V2ST1?

The MM3Z8V2ST1 has a Zener voltage tolerance of ±3.2%, specified as 8.02 V minimum to 8.36 V maximum at I_ZT = 5 mA and T_A = 25°C. This tight tolerance enables use in precision reference and clamping applications without calibration. The MM3Z8V2ST1 maintains this specification across its qualified operating temperature range and is tested per onsemi's production screening standards.

Can MM3Z8V2ST1 be used in place of a 5.1 V Zener diode?

No - the MM3Z8V2ST1 is an 8.2 V Zener diode and is not functionally interchangeable with 5.1 V devices such as MM3Z5V1ST1. Substituting it would result in incorrect regulation voltage, potentially causing overvoltage stress or failure in downstream circuitry. Always match Zener voltage ratings to the design's required clamping or reference level; the MM3Z8V2ST1 is intended for 8.2 V applications only.

What is the maximum reverse leakage current for MM3Z8V2ST1?

The maximum reverse leakage current for MM3Z8V2ST1 is 0.7 µA at V_R = 6.2 V and T_A = 25°C. This value is measured under standardized test conditions and reflects the device's ability to minimize standby current in bias networks. The MM3Z8V2ST1 maintains low leakage across its operating temperature range, supporting energy-efficient portable designs.

Is MM3Z8V2ST1 compatible with lead-free reflow soldering processes?

Yes - the MM3Z8V2ST1 is rated for lead-free reflow with a maximum soldering temperature of 260°C for 10 seconds, compliant with J-STD-020. Its Pb-free variant (MM3Z8V2ST1G) uses Sn-only plating and shares identical electrical specifications. The MM3Z8V2ST1 supports both SnPb and Pb-free assembly, making it suitable for mixed-technology manufacturing environments.

Does MM3Z8V2ST1 have a specified junction-to-ambient thermal resistance?

Yes - the MM3Z8V2ST1 has a specified junction-to-ambient thermal resistance (R_JA) of 635°C/W when mounted on an FR-4 board with minimum pad layout. This value is used to calculate allowable power dissipation at elevated ambient temperatures using the derating factor of 1.5 mW/°C above 25°C. The MM3Z8V2ST1's R_JA is validated per JEDEC test methodology and applies directly to standard SOD−323 mounting conditions.

MM3Z8V2ST1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 8.2 V

Tolerance:: ±2%

Power - Max:: 200 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 700 nA @ 5 V

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

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

MM3Z8V2ST1 FAQ

1.How can I place an order for MM3Z8V2ST1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MM3Z8V2ST1 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 MM3Z8V2ST1 reliable?

The price and inventory of MM3Z8V2ST1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z8V2ST1 is usually 5 days.

3.What payment methods are accepted for MM3Z8V2ST1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z8V2ST1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MM3Z8V2ST1?

MM3Z8V2ST1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MM3Z8V2ST1 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 MM3Z8V2ST1?

For technical support, including MM3Z8V2ST1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z8V2ST1 requirements.

6.How does Aetrix verify that MM3Z8V2ST1 is sourced from the original manufacturer or authorized distributors?

All MM3Z8V2ST1 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 MM3Z8V2ST1 meets industry standards.

7.What is the process for return or replacement of MM3Z8V2ST1?

All MM3Z8V2ST1 units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z8V2ST1, 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 MM3Z8V2ST1 part is unused and in its original packaging.

Return procedure for MM3Z8V2ST1:

1.Submit a request within 90 days.

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

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