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

onsemi SZMMSZ5235ET1G

Name: SZMMSZ5235ET1G
Brand: onsemi
SKU: SZMMSZ5235ET1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZMMSZ5235ET1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: SZMMSZ5235ET1G.pdf

Description:: DIODE ZENER 6.8V 500MW SOD123

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Inventory:5,720

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Product details

Overview

SZMMSZ5235ET1G from onsemi is a 6.8 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 5 Ω maximum dynamic impedance at 20 mA test current and 0.25 µA leakage current at 3 V reverse bias; used for voltage regulation and reference in low-power analog circuits.

For engineers reviewing the SZMMSZ5235ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance (150 °C/W), ESD robustness (Class 3, >16 kV HBM), and SOD-123 footprint compatibility with automated assembly.

Technical Context

This device operates as a two-terminal voltage reference by maintaining a stable reverse breakdown voltage across its cathode-anode terminals under controlled current conditions. Its 6.8 V nominal Zener voltage is specified at 20 mA test current (IZT) with ±5% tolerance and exhibits a temperature coefficient near zero in the 6–7 V range, minimizing drift over −55 °C to +150 °C.

The SOD-123 package enables high-density PCB layout while supporting 225 W nonrepetitive surge capability (8 × 20 µs pulse). Junction-to-lead thermal resistance of 150 °C/W allows effective heat conduction to copper traces, critical for sustained operation at elevated ambient temperatures.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	6.46 V min / 6.8 V nom / 7.14 V max at I_ZT = 20 mA - defines precision voltage clamping window for regulation
Zener Impedance (Z_ZT)	5 Ω max at I_ZT = 20 mA - ensures minimal output voltage variation under load current changes
Power Dissipation (P_D)	500 mW at T_L = 75 °C, derated 6.7 mW/°C above - sets maximum continuous DC power handling on standard PCB
Leakage Current (I_R)	0.25 µA max at V_R = 3 V - guarantees low standby current in battery-powered or high-impedance bias networks
ESD Rating	Class 3 (>16 kV) per Human Body Model - supports robust handling in manual assembly and field-replaceable modules
Junction Temp Range	−55 °C to +150 °C - enables use in automotive engine compartments and industrial control enclosures

Pinout & Package

The SZMMSZ5235ET1G is housed in a surface-mount SOD-123 plastic package (Case 425, Style 1), measuring 1.60 × 2.69 × 1.16 mm, with cathode indicated by a polarity band. It features a void-free thermosetting plastic case, UL 94 V-0 flammability rating, and corrosion-resistant finish for reliable soldering.

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
AEC-Q101 Qualified	Validated for automotive applications including under-hood electronics and body control modules
Pb-Free Construction	RoHS-compliant packaging with "G" suffix and optional microdot marking for traceability
Optimized for Automated Assembly	Small SOD-123 footprint and lead geometry support high-yield pick-and-place and reflow processes
High Surge Withstand	225 W peak power rating (8 × 20 µs) enables transient overvoltage protection without external crowbar circuitry

Applications

Low-Voltage Reference Source	Overvoltage Clamp in Sensor Interface
Use Scenario: Providing stable 6.8 V reference for ADC biasing or op-amp feedback networks in portable instrumentation. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise DC operating point. Use Value: Tight ±5% V_Z tolerance and low 5 Ω Z_ZT ensure <±10 mV output deviation across 5–25 mA load current range.	Use Scenario: Protecting 3.3 V or 5 V microcontroller I/O pins from ESD or inductive kickback in industrial sensor nodes. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage excursion to ≤7.14 V during transients. Use Value: 225 W surge rating and Class 3 ESD immunity allow direct placement at connector entry points without series resistance.
Power Supply Rail Stabilization	Temperature-Stable Bias Generator
Use Scenario: Regulating auxiliary 6.8 V rail derived from unregulated 9–12 V supply in embedded power management subsystems. IC Role / Device Role / Timing Role: Passive shunt regulator absorbing excess current to maintain constant output voltage. Use Value: 500 mW power rating supports up to ~73 mA average current (6.8 V × 73 mA ≈ 500 mW) at 75 °C board temperature.	Use Scenario: Generating temperature-compensated bias currents in analog front-end amplifiers operating across −40 °C to +85 °C. IC Role / Device Role / Timing Role: Zener element in compensated current mirror or bandgap-assisted reference topology. Use Value: Near-zero temperature coefficient around 6.8 V minimizes drift (<±0.5 mV/°C) versus alternatives outside 5–8 V range.

Low-Voltage Reference Source

Overvoltage Clamp in Sensor Interface

Use Scenario: Providing stable 6.8 V reference for ADC biasing or op-amp feedback networks in portable instrumentation.

IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise DC operating point.

Use Value: Tight ±5% V_Z tolerance and low 5 Ω Z_ZT ensure <±10 mV output deviation across 5–25 mA load current range.

Use Scenario: Protecting 3.3 V or 5 V microcontroller I/O pins from ESD or inductive kickback in industrial sensor nodes.

IC Role / Device Role / Timing Role: Shunt clamp limiting voltage excursion to ≤7.14 V during transients.

Use Value: 225 W surge rating and Class 3 ESD immunity allow direct placement at connector entry points without series resistance.

Power Supply Rail Stabilization

Temperature-Stable Bias Generator

Use Scenario: Regulating auxiliary 6.8 V rail derived from unregulated 9–12 V supply in embedded power management subsystems.

IC Role / Device Role / Timing Role: Passive shunt regulator absorbing excess current to maintain constant output voltage.

Use Value: 500 mW power rating supports up to ~73 mA average current (6.8 V × 73 mA ≈ 500 mW) at 75 °C board temperature.

Use Scenario: Generating temperature-compensated bias currents in analog front-end amplifiers operating across −40 °C to +85 °C.

IC Role / Device Role / Timing Role: Zener element in compensated current mirror or bandgap-assisted reference topology.

Use Value: Near-zero temperature coefficient around 6.8 V minimizes drift (<±0.5 mV/°C) versus alternatives outside 5–8 V range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMSZ5235ET1G	No SZ prefix; not AEC-Q101 qualified; same electrical specs and SOD-123 package	Intended for commercial/industrial use only; lacks automotive qualification documentation and PPAP support	Select when automotive compliance is unnecessary and cost sensitivity favors non-SZ variant
BZX84-C6V8	Same 6.8 V nominal Zener voltage but SOT-23 package; higher Z_ZT (10 Ω typical); 350 mW P_D	Lower power handling and larger footprint; less suitable for high-density or high-surge environments	Choose only if SOT-23 is already standardized in design and surge requirements are below 100 W

Compared with MMSZ5235ET1G and BZX84-C6V8, SZMMSZ5235ET1G uniquely combines AEC-Q101 qualification, 500 mW power rating, and 5 Ω Z_ZT in SOD-123-making it optimal for space-constrained automotive and industrial voltage reference designs requiring long-term reliability.

Availability

SZMMSZ5235ET1G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, and portable medical device power management requiring stable component supply and full AEC-Q101 compliance.

Supply support for SZMMSZ5235ET1G 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

SZMMSZ5235ET1G belongs to the SZMMSZ52xxET1G Zener regulator family, engineered for high-reliability voltage reference and clamping in harsh-environment applications where AEC-Q101 qualification and tight parametric control are mandatory.

FAQ

What is the nominal Zener voltage and tolerance of SZMMSZ5235ET1G?

The SZMMSZ5235ET1G has a nominal Zener voltage of 6.8 V with a standard tolerance of ±5%, meaning the actual measured voltage falls between 6.46 V and 7.14 V when tested at 20 mA (IZT) and 25 °C ambient. This tolerance is guaranteed across the full operating temperature range and applies to all units shipped under this part number.

Is SZMMSZ5235ET1G suitable for automotive applications?

Yes, SZMMSZ5235ET1G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including body control modules, infotainment power rails, and sensor interface protection. The "SZ" prefix explicitly denotes compliance with automotive site and process control requirements, distinguishing it from the commercial-grade MMSZ5235ET1G variant.

What is the maximum power dissipation for SZMMSZ5235ET1G on a standard PCB?

SZMMSZ5235ET1G is rated for 500 mW total power dissipation on an FR-5 board at a lead temperature (TL) of 75 °C, with linear derating of 6.7 mW/°C above that temperature. At 25 °C ambient, actual dissipation depends on board layout and copper area, but the 500 mW rating assumes minimum recommended footprint per onsemi's datasheet.

Does SZMMSZ5235ET1G have ESD protection built-in?

Yes, SZMMSZ5235ET1G is rated Class 3 for ESD per the Human Body Model (HBM), with a minimum withstand voltage of >16 kV. This level of ESD robustness is inherent to the device structure and packaging, eliminating the need for external ESD protection components in most board-level implementations.

What package type and dimensions does SZMMSZ5235ET1G use?

SZMMSZ5235ET1G uses the SOD-123 surface-mount package (Case 425, Style 1), measuring 1.60 mm × 2.69 mm × 1.16 mm. It features a cathode band for polarity identification, Pb-free construction, and UL 94 V-0 flammability rating-optimized for high-density layouts and automated assembly processes.

SZMMSZ5235ET1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: SZMMSZ52xxxT1G

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 5 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 5 V

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

Operating Temperature:: -55°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123

SZMMSZ5235ET1G FAQ

1.How can I place an order for SZMMSZ5235ET1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZMMSZ5235ET1G 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 SZMMSZ5235ET1G reliable?

The price and inventory of SZMMSZ5235ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ5235ET1G is usually 5 days.

3.What payment methods are accepted for SZMMSZ5235ET1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ5235ET1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZMMSZ5235ET1G?

SZMMSZ5235ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZMMSZ5235ET1G 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 SZMMSZ5235ET1G?

For technical support, including SZMMSZ5235ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ5235ET1G requirements.

6.How does Aetrix verify that SZMMSZ5235ET1G is sourced from the original manufacturer or authorized distributors?

All SZMMSZ5235ET1G 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 SZMMSZ5235ET1G meets industry standards.

7.What is the process for return or replacement of SZMMSZ5235ET1G?

All SZMMSZ5235ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ5235ET1G, 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 SZMMSZ5235ET1G part is unused and in its original packaging.

Return procedure for SZMMSZ5235ET1G:

1.Submit a request within 90 days.

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

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