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onsemi SZMMSZ4680ET1G
- Part No.:
- SZMMSZ4680ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ4680ET1G.pdf
- Description:
- DIODE ZENER 2.2V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SZMMSZ4680ET1G from onsemi is a 2.2 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C, with 225 W peak surge capability (8 × 20 µs), 16 kV HBM ESD rating, and AEC-Q101 qualification - used for precision voltage reference and overvoltage protection in automotive sensor interfaces.
For engineers reviewing the SZMMSZ4680ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (RJL = 150 °C/W), leakage current (IR ≤ 4 µA @ VR = 1 V), and automotive-grade qualification status.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at a tightly controlled 2.2 V nominal Zener voltage (2.09–2.31 V range) with test current IZT = 50 mA. Its low dynamic impedance (ZZT ≈ 25 Ω typical at 1 mA) ensures stable regulation under varying load conditions.
Designed for surface-mount assembly on FR-5 PCBs, it features a cathode-band polarity indicator, UL 94 V-0 flammability rating, and Pb-free construction. Junction temperature range spans −55 °C to +150 °C, supporting operation in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.2 V nominal, 2.09–2.31 V min/max at IZT = 50 mA - defines precise clamping threshold for low-voltage rail protection. |
| Power Dissipation (PD) | 500 mW at TL = 75 °C - sets maximum continuous DC power handling on standard PCB layout. |
| Peak Surge Power (Ppk) | 225 W for 8 × 20 µs pulse - enables transient overvoltage suppression without failure. |
| Leakage Current (IR) | ≤ 4 µA at VR = 1 V - ensures minimal standby current draw in battery-powered systems. |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust electrostatic immunity during handling and board assembly. |
| Thermal Resistance (RJL) | 150 °C/W junction-to-lead - supports reliable heat transfer to PCB copper when lead-soldered. |
| AEC-Q101 Qualified | Yes - validates suitability for automotive electronics per stress-test requirements including HTOL, TC, and HTRB. |
Pinout & Package
Package: SOD-123 (Case 425, 1.60 × 2.69 × 1.16 mm), void-free thermosetting plastic case with corrosion-resistant finish; cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased Zener terminal | Connected to regulated node or protected signal line; carries reverse current during clamping. |
| 2 (Anode) | Reference/ground terminal | Tied to system ground or lower-potential rail; completes Zener conduction path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 qualified and PPAP capable - enables direct use in production automotive ECUs without requalification. |
| Low-leakage regulation | IR ≤ 4 µA @ 1 V - minimizes quiescent current in always-on vehicle modules (e.g., CAN wake-up circuits). |
| High surge robustness | 225 W peak power (8 × 20 µs) - withstands ISO 7637-2 pulse 1 and pulse 2a transients without degradation. |
| Pb-free and RoHS compliant | "G" suffix denotes Pb-free packaging - meets global environmental compliance requirements for automotive supply chain. |
Applications
| Automotive Sensor Signal Conditioning | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine control units against load-dump transients. IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping signal line to 2.2 V to prevent ADC saturation or op-amp damage. Use Value: Maintains signal integrity below 2.31 V while drawing <4 µA leakage at 1 V bias - preserving sensor accuracy and low-power operation. | Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers from field-wiring surges. IC Role / Device Role / Timing Role: Front-end overvoltage clamp limiting input voltage to safe levels before optocoupler or Schmitt trigger stage. Use Value: Absorbs 225 W transient energy without failure, enabling compliance with IEC 61000-4-4 level 4 immunity testing. |
| USB-C Port VBUS Monitoring Reference | Medical Wearable Battery Voltage Supervisor |
Use Scenario: Providing stable 2.2 V reference for ADC-based VBUS voltage monitoring in USB-C power delivery negotiation circuits. IC Role / Device Role / Timing Role: Precision Zener reference source feeding into comparator or microcontroller ADC input. Use Value: Tight ±5% VZ tolerance and low TC ensure measurement accuracy across −40 °C to +85 °C operating range. | Use Scenario: Monitoring lithium coin-cell voltage (e.g., CR2032) in compact wearable health monitors to trigger low-battery alerts. IC Role / Device Role / Timing Role: Low-current Zener reference enabling ultra-low-power voltage detection circuitry. Use Value: 4 µA max leakage at 1 V ensures negligible drain on 220 mAh battery - extending operational life beyond 12 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ4680ET1G | No SZ prefix; not AEC-Q101 qualified; same electrical specs and SOD-123 package. | Intended for commercial/industrial use only; lacks automotive process controls and PPAP documentation. | Select when automotive qualification is unnecessary and cost sensitivity is higher. |
| BZX84-C2V2LT1G | 2.2 V Zener, SOT-23 package, 350 mW PD, 100 °C/W RJA; no AEC-Q101 rating. | Smaller footprint but lower power and thermal performance; unsuitable for high-surge automotive nodes. | Choose for space-constrained non-automotive designs where 500 mW derating margin is not required. |
Compared with MMSZ4680ET1G and BZX84-C2V2LT1G, SZMMSZ4680ET1G uniquely delivers AEC-Q101 compliance, 500 mW power rating at elevated ambient temperatures, and 225 W surge capability - making it the only option qualified for safety-critical automotive signal protection.
Availability
SZMMSZ4680ET1G is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC input protection, and medical wearable battery supervision requiring stable component supply and long-term lifecycle support.
Supply support for SZMMSZ4680ET1G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ4xxx/SZMMSZ4xxx series was designed specifically for high-reliability voltage regulation and transient suppression in space-constrained, thermally demanding environments - especially automotive electronics requiring AEC-Q101 validation.
FAQ
What is the nominal Zener voltage and tolerance of SZMMSZ4680ET1G?
The SZMMSZ4680ET1G has a nominal Zener voltage of 2.2 V with a tolerance of ±5%, measured at IZT = 50 mA and TL = 30 °C ±1 °C. The guaranteed minimum and maximum values are 2.09 V and 2.31 V respectively, as specified in the onsemi datasheet revision 7 (April 2025). This tight tolerance supports accurate voltage clamping in precision analog circuits.
Is SZMMSZ4680ET1G suitable for automotive applications?
Yes, SZMMSZ4680ET1G is AEC-Q101 qualified and PPAP capable, with full documentation supporting its use in automotive electronics. It meets stress-test requirements including high-temperature operating life, temperature cycling, and highly accelerated stress testing - making it appropriate for engine control, body electronics, and ADAS sensor modules where reliability is critical.
What is the maximum power dissipation of SZMMSZ4680ET1G on a standard PCB?
SZMMSZ4680ET1G is rated for 500 mW total power dissipation on an FR-5 board at lead temperature (TL) = 75 °C, with linear derating of 6.7 mW/°C above that temperature. This rating assumes the minimum recommended footprint per onsemi's SOD-123 layout guidelines and accounts for real-world thermal coupling to PCB copper.
Does SZMMSZ4680ET1G have ESD protection built-in?
Yes, SZMMSZ4680ET1G features an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), verified per JEDEC JS-001. This level of ESD robustness allows safe handling during automated assembly and protects downstream circuitry from electrostatic discharge events in end-use environments.
What is the leakage current specification for SZMMSZ4680ET1G at 1 V reverse bias?
The leakage current (IR) for SZMMSZ4680ET1G is specified as ≤ 4 µA at VR = 1 V and TA = 25 °C. This low leakage supports energy-sensitive applications such as battery-backed sensors and always-on automotive modules where standby current must be minimized.
SZMMSZ4680ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 4 µA @ 1 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
SZMMSZ4680ET1G FAQ
1.How can I place an order for SZMMSZ4680ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ4680ET1G 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 SZMMSZ4680ET1G reliable?
The price and inventory of SZMMSZ4680ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ4680ET1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ4680ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ4680ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ4680ET1G?
SZMMSZ4680ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ4680ET1G 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 SZMMSZ4680ET1G?
For technical support, including SZMMSZ4680ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ4680ET1G requirements.
6.How does Aetrix verify that SZMMSZ4680ET1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ4680ET1G 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 SZMMSZ4680ET1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ4680ET1G?
All SZMMSZ4680ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ4680ET1G, 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 SZMMSZ4680ET1G part is unused and in its original packaging.
Return procedure for SZMMSZ4680ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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