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Vishay General Semiconductor - Diodes Division SMB8J22CAHM3/I
- Part No.:
- SMB8J22CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J22CAHM3/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,151
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Product details
Overview
SMB8J22CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features 22 V standoff voltage (VWM), 24.4–26.9 V breakdown voltage (VBR), 35.5 V clamping voltage (VC) at 22.5 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J22CAHM3/I datasheet, SMB8J22CAHM3/I pinout, SMB8J22CAHM3/I application, or SMB8J22CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 22 V working voltage compatibility, low leakage (<1 µA at VWM), and SMB package suitability for automated SMT assembly in space-constrained designs.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging an avalanche junction to divert surge energy away from downstream circuitry. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity concerns, and its glass-passivated chip ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, supporting operation up to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and is halogen-free, RoHS-compliant, and qualified to AEC-Q101 - confirming suitability for automotive under-hood and infotainment applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 24.4 V / 26.9 V - guaranteed avalanche onset range at 1 mA test current |
| VC @ IPPM | 35.5 V at 22.5 A - clamped voltage during 10/1000 µs surge, limiting stress on protected ICs |
| PPPM | 800 W - peak transient power handling capacity under standardized waveform |
| ID @ VWM | <1 µA - ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max. | +150 °C - enables deployment in high-temperature automotive and industrial environments |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with standard reflow profiles and pick-and-place equipment |
Pinout & Package
SMB8J22CAHM3/I uses the standard SMB (DO-214AA) package: molded plastic body with matte tin-plated leads, no polarity marking (bidirectional), and dimensions of 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Mounting requires 5.0 mm × 5.0 mm copper pads per terminal per Vishay's recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction - either terminal serves as input/output for transient suppression in AC or differential paths |
| Case | Non-electrical mechanical housing | UL 94 V-0 rated molding compound provides flame resistance and mechanical robustness |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance |
| Halogen-free & RoHS-compliant | Meets global environmental compliance requirements without compromising electrical performance |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = ~1.46) and higher energy absorption efficiency |
| MSL Level 1 rating | Allows unlimited floor life and exposure to 260 °C peak reflow without moisture-induced damage |
| Glass-passivated junction | Ensures stable VBR tolerance over time and immunity to surface contamination or humidity drift |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Maintains 22 V system compatibility while clamping surges to ≤35.5 V, preventing latch-up or permanent damage to 3.3 V/5 V microcontrollers and ADC front-ends. | Use Scenario: Safeguarding PLC digital input modules and fieldbus interfaces (RS-485, Profibus) against lightning-induced surges and inductive switching spikes. IC Role / Device Role / Timing Role: Primary line-level surge suppressor mounted on PCB edge connectors or terminal blocks to absorb 800 W transient energy. Use Value: Enables robust 24 V DC industrial systems to meet IEC 61000-4-5 Level 3 (2 kV/1 kA) immunity without external spark gaps or MOVs. |
| Consumer Power Adapter Input | Telecom Line Card Protection |
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters and USB PD power supplies exposed to mains-borne transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS across DC output rails to prevent overvoltage propagation to connected devices during regulator failure or feedback loop disruption. Use Value: Limits fault voltage to 35.5 V within microseconds, protecting downstream USB-C controllers and battery management ICs rated for ≤20 V absolute maximum. | Use Scenario: Surge protection for Ethernet PHY interfaces and POTS line drivers in telecom access equipment and VoIP gateways. IC Role / Device Role / Timing Role: Bidirectional clamp on differential pairs (e.g., TX+/TX−) to suppress common-mode and differential-mode transients without distorting signal integrity. Use Value: Delivers <1 µA leakage at 22 V, preserving low-noise performance while surviving repeated 10/1000 µs surges up to 800 W per line pair. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J22CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Approved for commercial/industrial use only; excluded from automotive production | Select when halogen-free content or automotive qualification is not required |
| SMAJ22CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (~100 °C/W) | Limited to lower-energy transients; less thermal margin in high-ambient environments | Choose for cost-sensitive, space-constrained non-automotive designs with ≤400 W surge requirements |
Compared with SMB8J22CAHE3/I and SMAJ22CA, SMB8J22CAHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, and 800 W surge capacity in the SMB footprint - making it the only option among the three validated for under-hood automotive deployment with full environmental compliance.
Availability
SMB8J22CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface units requiring stable component supply, long-lifecycle support, and certified AEC-Q101 reliability.
Supply support for SMB8J22CAHM3/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability, high-power-density solutions.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust, bidirectional transient suppression in automotive, industrial, and communications infrastructure where AEC-Q101 compliance and 800 W surge handling are mandatory.
FAQ
What is the clamping voltage of SMB8J22CAHM3/I and how is it measured?
The SMB8J22CAHM3/I has a maximum clamping voltage (VC) of 35.5 V, measured at 22.5 A peak pulse current (IPPM) using the standardized 10/1000 µs double-exponential surge waveform. This value reflects the actual voltage seen by downstream components during worst-case transient events and is guaranteed across the full operating temperature range per Vishay Document 88422.
Is SMB8J22CAHM3/I suitable for automotive applications?
Yes, SMB8J22CAHM3/I is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It supports under-hood and cabin applications including sensor interfaces, body control modules, and infotainment power rails where temperature, vibration, and surge immunity are critical.
How does SMB8J22CAHM3/I differ from unidirectional variants like SMB10J22A?
SMB8J22CAHM3/I is bidirectional with symmetrical clamping behavior on both polarities, enabling protection of AC-coupled or differential lines without polarity constraints. In contrast, SMB10J22A is unidirectional, offers 1000 W PPPM, and includes a cathode band marking - making it suitable only for DC rail protection with defined polarity.
What is the thermal resistance of SMB8J22CAHM3/I and why does it matter?
SMB8J22CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. These values determine how effectively heat from surge dissipation is transferred to the PCB and ambient air - critical for maintaining TJ ≤ 150 °C during repetitive transients and ensuring long-term reliability in high-temperature environments.
Does SMB8J22CAHM3/I require special PCB layout considerations?
Yes - Vishay specifies minimum 5.0 mm × 5.0 mm copper pads per terminal to achieve rated 800 W PPPM and optimal thermal performance. Smaller pads reduce surge current handling and increase localized heating. The SMB (DO-214AA) footprint also requires adherence to IPC-7351B standards for solder mask clearance and stencil aperture design to ensure reliable reflow yield.
SMB8J22CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 22.5A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J22CAHM3/I FAQ
1.How can I place an order for SMB8J22CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J22CAHM3/I 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 SMB8J22CAHM3/I reliable?
The price and inventory of SMB8J22CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J22CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J22CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J22CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J22CAHM3/I?
SMB8J22CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J22CAHM3/I 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 SMB8J22CAHM3/I?
For technical support, including SMB8J22CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J22CAHM3/I requirements.
6.How does Aetrix verify that SMB8J22CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J22CAHM3/I 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 SMB8J22CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J22CAHM3/I?
All SMB8J22CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J22CAHM3/I, 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 SMB8J22CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J22CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J22CAHM3/I Tags
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