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

onsemi MMSZ6V8T1

Name: MMSZ6V8T1
Brand: onsemi
SKU: MMSZ6V8T1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMSZ6V8T1

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: MMSZ6V8T1.pdf

Description:: DIODE ZENER 6.8V 500MW SOD123

Quantity:: RFQ Add To RFQ list

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Inventory:3,119

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Product details

Overview

MMSZ6V8T1G from onsemi is a 500 mW, 6.8 V ±5% Zener diode in SOD−123 package, designed for precision voltage regulation and transient suppression in low-power analog circuits, power supply feedback loops, and reference voltage generation. It delivers 15 Ω dynamic impedance at 5 mA, 2 µA reverse leakage at 5.6 V, and operates across −55°C to +150°C.

For engineers reviewing the MMSZ6V8T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (R_JL = 150°C/W), ESD robustness (>16 kV HBM), AEC−Q101 qualification status, and SOD−123 board assembly compatibility.

Technical Context

This device functions as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener breakdown threshold. Its operation relies on controlled avalanche or Zener breakdown depending on voltage level - at 6.8 V, it operates in the transition region with moderate temperature coefficient (~2.4 mV/°C).

The SOD−123 package enables high-density placement while supporting automated reflow soldering at peak temperatures up to 260°C for 10 seconds. Thermal performance is characterized by R_JA = 340°C/W (FR−5 board) and R_JL = 150°C/W, enabling reliable operation under sustained 500 mW dissipation at T_L ≤ 75°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	6.46–7.14 V @ I_ZT = 5 mA; ±5% tolerance ensures predictable clamping in feedback networks.
Zener Impedance (Z_ZT)	15 Ω max @ I_ZT = 5 mA; low dynamic resistance maintains regulation stability under load variation.
Reverse Leakage (I_R)	2 µA max @ V_R = 5.6 V; minimal standby current preserves efficiency in battery-powered systems.
Power Dissipation	500 mW on FR−5 board @ T_L = 75°C; derates linearly at 6.7 mW/°C above 75°C.
Thermal Resistance	R_JL = 150°C/W; enables efficient heat transfer to PCB copper, critical for compact designs.
ESD Rating	Class 3 (>16 kV) per HBM; protects against handling-induced damage during assembly and field operation.
Operating Temperature	−55°C to +150°C; supports automotive under-hood and industrial control environments.

Pinout & Package

SOD−123 surface-mount package: 2-pin, cathode-indicated band, dimensions 1.60 × 2.69 × 1.16 mm, void-free thermosetting plastic case rated UL 94 V−0.

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

Key Features

Feature	Design Value
AEC−Q101 Qualified	Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration.
Pb−Free Construction	RoHS-compliant SOD−123 package with corrosion-resistant finish, compatible with lead-free reflow profiles.
Optimized for Automated Assembly	Small footprint and polarity marking support high-yield pick-and-place and AOI inspection in volume manufacturing.
High-Density Packaging	1.60 mm width enables placement in tight spaces such as portable medical sensors and IoT edge nodes.

Applications

Power Supply Feedback	Overvoltage Protection
Use Scenario: Regulating output voltage in isolated DC−DC converters using optocoupler-based feedback loops. IC Role / Device Role / Timing Role: Shunt reference providing precise 6.8 V threshold to error amplifier input. Use Value: Tight ±5% V_Z tolerance and low Z_ZT ensure <±1% output regulation accuracy across line/load changes.	Use Scenario: Clamping transient surges on 5 V logic rails caused by ESD or inductive switching. IC Role / Device Role / Timing Role: Fast-acting voltage clamp diverting surge current away from sensitive IC inputs. Use Value: 2 µA leakage at 5.6 V prevents false triggering; 15 Ω Z_ZT limits clamping voltage overshoot during 1 ms pulses.
Reference Voltage Source	Temperature-Stable Biasing
Use Scenario: Generating stable bias for op-amp comparators in battery management systems. IC Role / Device Role / Timing Role: Precision voltage reference establishing trip points for cell overvoltage detection. Use Value: Operation from −55°C to +150°C ensures consistent 6.8 V reference across automotive temperature extremes.	Use Scenario: Setting collector current in discrete transistor amplifiers used in sensor signal conditioning. IC Role / Device Role / Timing Role: Zener-biased base voltage source compensating for β drift with temperature. Use Value: Moderate TC (~2.4 mV/°C) allows predictable bias shift, simplifying compensation design vs. higher-TC alternatives.

Power Supply Feedback

Overvoltage Protection

Use Scenario: Regulating output voltage in isolated DC−DC converters using optocoupler-based feedback loops.

IC Role / Device Role / Timing Role: Shunt reference providing precise 6.8 V threshold to error amplifier input.

Use Value: Tight ±5% V_Z tolerance and low Z_ZT ensure <±1% output regulation accuracy across line/load changes.

Use Scenario: Clamping transient surges on 5 V logic rails caused by ESD or inductive switching.

IC Role / Device Role / Timing Role: Fast-acting voltage clamp diverting surge current away from sensitive IC inputs.

Use Value: 2 µA leakage at 5.6 V prevents false triggering; 15 Ω Z_ZT limits clamping voltage overshoot during 1 ms pulses.

Reference Voltage Source

Temperature-Stable Biasing

Use Scenario: Generating stable bias for op-amp comparators in battery management systems.

IC Role / Device Role / Timing Role: Precision voltage reference establishing trip points for cell overvoltage detection.

Use Value: Operation from −55°C to +150°C ensures consistent 6.8 V reference across automotive temperature extremes.

Use Scenario: Setting collector current in discrete transistor amplifiers used in sensor signal conditioning.

IC Role / Device Role / Timing Role: Zener-biased base voltage source compensating for β drift with temperature.

Use Value: Moderate TC (~2.4 mV/°C) allows predictable bias shift, simplifying compensation design vs. higher-TC alternatives.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C6V8	Same 6.8 V nominal, ±5% tolerance, but SOT−23 package (larger footprint, R_JL = 300°C/W).	Higher thermal resistance limits continuous power in space-constrained layouts; less suitable for high-density PCBs.	Select when legacy SOT−23 footprint compatibility is required and thermal margin permits.
MMBZ5236BS	6.8 V Zener, SOT−323 package, 200 mW rating, 30 Ω Z_ZT, no AEC−Q101 qualification.	Lower power rating and absence of automotive qualification restrict use to consumer-grade non-safety-critical circuits.	Choose only for cost-sensitive, non-automotive applications where 200 mW suffices and AEC−Q101 is unnecessary.

Compared with BZX84-C6V8 and MMBZ5236BS, the MMSZ6V8T1G offers superior thermal performance (R_JL = 150°C/W), AEC−Q101 qualification, and smaller SOD−123 footprint-making it optimal for automotive and high-reliability industrial designs demanding compact, robust voltage regulation.

Availability

MMSZ6V8T1G is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, and portable medical devices requiring stable component supply and long-term lifecycle support.

Supply support for MMSZ6V8T1G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MMSZxxxT1G series targets high-volume, space-constrained applications needing reliable, low-cost Zener regulation with automotive-grade qualification and Pb−free compliance.

FAQ

What is the Zener voltage tolerance for MMSZ6V8T1G?

The MMSZ6V8T1G has a nominal Zener voltage of 6.8 V with a standard tolerance of ±5%, resulting in a guaranteed range of 6.46 V to 7.14 V at test current I_ZT = 5 mA. This tolerance is measured under pulsed conditions (PW = 1 ms) and applies across the full operating temperature range.

Is MMSZ6V8T1G qualified for automotive applications?

Yes, the MMSZ6V8T1G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control modules, body electronics, and ADAS subsystems where reliability under thermal cycling, vibration, and extended temperature ranges is required.

What is the maximum power dissipation of MMSZ6V8T1G on a standard PCB?

The MMSZ6V8T1G is rated for 500 mW total power dissipation on an FR−5 board at lead temperature T_L = 75°C. Above this temperature, it derates linearly at 6.7 mW/°C, reaching zero dissipation at approximately 149°C.

Does MMSZ6V8T1G have Pb−free packaging?

Yes, the "G" suffix in MMSZ6V8T1G denotes a Pb−free, RoHS-compliant package. The SOD−123 case uses corrosion-resistant, easily solderable finish and meets UL 94 V−0 flammability rating.

What is the reverse leakage current specification for MMSZ6V8T1G?

The MMSZ6V8T1G exhibits a maximum reverse leakage current of 2 µA at V_R = 5.6 V (90% of nominal Zener voltage), measured at T_A = 25°C. This low leakage supports energy efficiency in always-on circuits and battery-backed systems.

MMSZ6V8T1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 6.8 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 2 µA @ 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

MMSZ6V8T1 FAQ

1.How can I place an order for MMSZ6V8T1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMSZ6V8T1 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 MMSZ6V8T1 reliable?

The price and inventory of MMSZ6V8T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ6V8T1 is usually 5 days.

3.What payment methods are accepted for MMSZ6V8T1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ6V8T1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMSZ6V8T1?

MMSZ6V8T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMSZ6V8T1 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 MMSZ6V8T1?

For technical support, including MMSZ6V8T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ6V8T1 requirements.

6.How does Aetrix verify that MMSZ6V8T1 is sourced from the original manufacturer or authorized distributors?

All MMSZ6V8T1 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 MMSZ6V8T1 meets industry standards.

7.What is the process for return or replacement of MMSZ6V8T1?

All MMSZ6V8T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ6V8T1, 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 MMSZ6V8T1 part is unused and in its original packaging.

Return procedure for MMSZ6V8T1:

1.Submit a request within 90 days.

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

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