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onsemi SZ1SMB22AT3G
- Part No.:
- SZ1SMB22AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB22AT3G.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:144,333
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Product details
Overview
SZ1SMB22AT3G from onsemi is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) in SMB package, designed for parallel overvoltage clamping in DC power rails and signal lines. It features a 22 V working peak reverse voltage (VRWM), 25.65 V nominal breakdown voltage (VBR) at 1.0 mA test current, and clamps to ≤35.5 V at 16.9 A peak pulse current (IPP), making it suitable for automotive power supply protection and industrial I/O interface surge suppression.
For engineers reviewing the SZ1SMB22AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current capability under 10/1000 µs waveform, UL 497B recognition for isolated loop circuits, and AEC−Q101 qualification for automotive use.
Technical Context
The SZ1SMB22AT3G operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients above VRWM = 22 V. Its low zener impedance and <1.0 ns response time enable fast suppression of ESD and lightning-induced surges without affecting normal circuit operation.
It is rated for 600 W peak power (10/1000 µs waveform), supports 100 A forward surge current (8.3 ms half-sine), and exhibits <5.0 µA leakage at VRWM. Thermal design relies on junction-to-lead resistance (RJL = 25 °C/W) and maximum junction temperature of +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC rail voltage. |
| VBR (min/typ/max) | 24.4 V / 25.65 V / 26.9 V @ IT = 1.0 mA - Ensures reliable turn-on within defined tolerance band during surge events. |
| VC @ IPP | 35.5 V @ 16.9 A - Clamped voltage seen by protected circuit during 10/1000 µs transient; defines safe overvoltage ceiling. |
| PPK | 600 W @ 1 ms - Peak transient energy absorption capacity; determines survivability against high-energy surges. |
| IR @ VRWM | 5.0 µA max - Low leakage preserves efficiency in standby and low-power systems. |
| Response Time | <1.0 ns - Enables suppression before sensitive downstream components experience damaging overvoltage. |
| ESD Rating | Class 3 (>16 kV HBM) - Meets stringent electrostatic discharge immunity requirements for automotive and industrial environments. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, Pb-free, void-free thermosetting plastic with modified L-bend leads and cathode polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamping configuration. |
| Cathode | Current exit terminal during reverse breakdown | Connected to protected line (e.g., 24 V rail); polarity band identifies this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| UL 497B recognized | Approved for isolated loop circuit protection per Underwriters Laboratories, covering strike voltage, endurance, and dielectric withstand. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on protected ICs while maintaining sufficient margin above VRWM. |
| Surmetic™ package | ON Semiconductor's proprietary molded construction ensures robust thermal performance and solder joint reliability at 260 °C for 10 s. |
| 100 A IFSM rating | Withstands repetitive inrush or fault currents without degradation, supporting robust front-end protection in power supplies. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: 24 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges >35 V. Use Value: Limits voltage to ≤35.5 V during 16.9 A transients, protecting downstream regulators and microcontrollers rated for 36 V absolute max. |
Use Scenario: 24 V digital input channels in programmable logic controllers subjected to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS at connector entry point to shunt transient energy before signal conditioning circuitry. Use Value: Sub-1 ns response and 16 kV HBM rating prevent latch-up or damage to optocouplers and level translators. |
| Medical Equipment Power Supply Input | Telecom Interface Surge Protection |
Use Scenario: AC/DC adapter output stage feeding safety-critical monitoring modules requiring uninterrupted operation. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated 24 V output to absorb coupling transients from primary-side switching noise or external surges. Use Value: UL 497B recognition confirms suitability for patient-connected equipment isolation barriers and meets IEC 60601-1 creepage/clearance requirements. |
Use Scenario: RS-485 or CAN bus interfaces in outdoor base stations exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Line-to-ground TVS on differential pair to limit common-mode overvoltage without distorting signal integrity. Use Value: 35.5 V clamping voltage aligns with 3.3 V/5 V transceiver absolute maximum ratings, preventing permanent damage during 1 kV/2 kV surge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Same VRWM (22 V), but lower PPK = 400 W and higher VC = 36.2 V @ 11.1 A; SMA package (smaller footprint, higher thermal resistance). | Limited to lower-energy transients; less suitable for automotive load dump where 600 W capability is required. | Choose SMAJ22A only when board space is constrained and surge threat level is below ISO 7637-2 Level III. |
| 1.5SMC22A | Same VRWM and PPK (600 W), but larger SMC package (7.1 mm × 6.2 mm vs. SMB 4.6 mm × 3.6 mm); identical electrical specs except Ctyp = 650 pF vs. 730 pF. | Better thermal dissipation in high-ambient environments; requires larger PCB area and different footprint. | Select 1.5SMC22A when sustained surge repetition or elevated ambient temperatures (>105 °C) demand superior thermal performance. |
Compared with SMAJ22A and 1.5SMC22A, the SZ1SMB22AT3G delivers optimal balance of 600 W surge handling, compact SMB footprint, AEC−Q101 qualification, and UL 497B recognition-making it preferred for space-constrained automotive and industrial control designs requiring certified reliability.
Availability
SZ1SMB22AT3G is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and medical power supply designs requiring stable component supply, long-term lifecycle support, and compliance with AEC−Q101 and UL 497B standards.
Supply support for SZ1SMB22AT3G 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, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SZ1SMB22AT3G belongs to the SZ1SMBxxAT3G series of AEC−Q101-qualified unidirectional TVS diodes, engineered specifically for robust overvoltage protection in harsh automotive and industrial environments where reliability and certification are mandatory.
FAQ
What is the clamping voltage of SZ1SMB22AT3G at its rated peak pulse current?
The SZ1SMB22AT3G clamps to a maximum of 35.5 V at its rated peak pulse current (IPP) of 16.9 A under the standard 10/1000 µs waveform. This value is measured per the test conditions specified in the official onsemi datasheet and reflects the actual voltage imposed on the protected circuit during worst-case surge events. The SZ1SMB22AT3G maintains this clamping performance across its qualified operating temperature range of −65 °C to +150 °C.
Is SZ1SMB22AT3G suitable for bidirectional signal line protection?
No, SZ1SMB22AT3G is a unidirectional TVS diode and is not suitable for bidirectional signal line protection such as RS-485 or USB data lines without additional circuitry. Its design allows conduction only in reverse breakdown (cathode-to-anode) and conducts forward like a standard diode. For bidirectional protection, a dedicated bidirectional part such as SZ1SMB22CAT3G or SMBJ22CA must be used. The SZ1SMB22AT3G datasheet explicitly specifies "Uni−Directional TVS" in its device identification.
Does SZ1SMB22AT3G meet automotive qualification standards?
Yes, SZ1SMB22AT3G is AEC−Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control units, body electronics, and infotainment systems. The "SZ" prefix denotes parts manufactured under automotive-specific process controls and traceability requirements. Certification covers stress tests including temperature cycling, high-temperature operating life, and ESD robustness, all validated per the AEC−Q101 standard. The SZ1SMB22AT3G is listed in onsemi's official AEC−Q101 qualified parts list.
What is the maximum leakage current of SZ1SMB22AT3G at its working voltage?
The maximum reverse leakage current (IR) of SZ1SMB22AT3G is 5.0 µA when biased at its working peak reverse voltage (VRWM) of 22 V and tested at TA = 25 °C. This low leakage ensures minimal power loss in always-on systems and avoids false triggering in high-impedance sensing circuits. The value is guaranteed across the full operating temperature range and is verified per the test method defined in the onsemi datasheet section "ELECTRICAL CHARACTERISTICS".
Can SZ1SMB22AT3G be used in place of a standard Zener diode for voltage regulation?
No, SZ1SMB22AT3G is not intended for steady-state voltage regulation. It is optimized for transient suppression-not continuous power dissipation-and lacks tight Zener voltage tolerance or low dynamic impedance under DC bias. Its 24.4–26.9 V breakdown range and 600 W peak rating reflect surge-handling capability, not regulation accuracy. Using SZ1SMB22AT3G as a regulator risks thermal runaway and premature failure. For regulation, use purpose-built Zener diodes such as MMSZ4687 or BZX84-C22, which specify DC power ratings and tighter VZ tolerances.
SZ1SMB22AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 16.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 730pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SZ1SMB22AT3G FAQ
1.How can I place an order for SZ1SMB22AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB22AT3G 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 SZ1SMB22AT3G reliable?
The price and inventory of SZ1SMB22AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB22AT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB22AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB22AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB22AT3G?
SZ1SMB22AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB22AT3G 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 SZ1SMB22AT3G?
For technical support, including SZ1SMB22AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB22AT3G requirements.
6.How does Aetrix verify that SZ1SMB22AT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB22AT3G 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 SZ1SMB22AT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB22AT3G?
All SZ1SMB22AT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB22AT3G, 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 SZ1SMB22AT3G part is unused and in its original packaging.
Return procedure for SZ1SMB22AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZ1SMB22AT3G Tags
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