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Vishay General Semiconductor - Diodes Division SMB8J22CAHM3/H
- Part No.:
- SMB8J22CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J22CAHM3/H.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J22CAHM3/H 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 a 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 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/H datasheet, SMB8J22CAHM3/H pinout, SMB8J22CAHM3/H application, or SMB8J22CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (HM3 suffix), and compatibility with 0.2" × 0.2" copper pad layouts per JEDEC standards.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the bidirectional configuration enables symmetrical clamping across both polarities without external polarity management.
The device is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJA = 72 °C/W, RθJL = 20 °C/W) supports reliable power dissipation in compact PCB layouts typical of automotive control units and industrial PLC modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse working voltage before leakage exceeds 1 μA; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 24.4 V / 26.9 V at 1 mA - guaranteed breakdown threshold range ensuring consistent clamping onset across production lots. |
| VC @ IPPM | 35.5 V at 22.5 A - clamping voltage under full 800 W surge; limits downstream IC stress to safe levels during ISO 7637-2 Pulse 1/2a/5a events. |
| PPPM | 800 W (10/1000 µs) - peak transient energy absorption capacity; sufficient for CAN FD, LIN, and RS-485 bus protection in automotive ECUs. |
| TJ max | +150 °C - enables operation in under-hood environments and industrial enclosures without derating below full power rating. |
| Package | SMB (DO-214AA) - surface-mount footprint (4.57 mm × 3.94 mm) compatible with automated placement and IPC-7351B land patterns. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TC, and ESD testing per AEC specification; required for ASIL-B/C subsystems. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient return path (bidirectional) | Provides symmetrical conduction path for positive and negative surges; no cathode band marking distinguishes it from unidirectional variants. |
| Cathode (unmarked end) | Transient return path (bidirectional) | Electrically identical to anode in bidirectional configuration; terminals are interchangeable in circuit layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN H/L, RS-485 A/B) without polarity constraints. |
| AEC-Q101 qualification | Validates long-term reliability under automotive thermal cycling, humidity, and vibration stresses - mandatory for Tier 1 ECU designs. |
| Halogen-free & RoHS-compliant (HM3) | Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance; supports green manufacturing and export compliance. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during surge events, reducing risk of gate oxide damage in protected MOSFETs or transceivers. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT line logistics and reduces handling cost. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Network |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between signal line and chassis ground, clamping spikes before they reach ADC input or op-amp buffer. Use Value: Maintains signal integrity under ISO 16750-2 Load Dump (87 V/1 s) and ISO 7637-2 Pulse 5a (75 V/300 ms), preventing sensor calibration drift or microcontroller reset. |
Use Scenario: Guarding differential data lines in factory automation PLCs connected to motor drives generating high dv/dt noise. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across RS-485 bus (A–B) and to ground, absorbing common-mode surges induced by nearby VFD switching. Use Value: Enables >25 kV ESD contact immunity (IEC 61000-4-2) and withstands 4 kV EFT (IEC 61000-4-4) without communication dropout or transceiver latch-up. |
| Automotive Body Control Module | Consumer Appliance Motor Driver |
Use Scenario: Safeguarding LIN bus lines in door module ECUs subjected to cable harness coupling and electrostatic discharge during assembly. IC Role / Device Role / Timing Role: Low-capacitance (CJ ≈ 200 pF at 0 V) TVS placed at connector entry point, minimizing signal distortion on 19.2 kbps LIN frames. Use Value: Prevents false wake-up or bus lockup during 8 kV air discharge events while maintaining timing margins for LIN header detection. |
Use Scenario: Suppressing commutation spikes on half-bridge gate drive signals in smart washing machine motor controllers. IC Role / Device Role / Timing Role: Clamping transient voltages generated by MOSFET turn-off across bootstrap capacitor and high-side driver supply rail. Use Value: Eliminates gate oxide stress and prevents unintended high-side FET turn-on, extending driver IC lifetime and avoiding motor stall faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J22CAHE3/H | Same electrical specs and SMB package, but RoHS-compliant without halogen-free certification (E3 vs HM3). | Approved for commercial/industrial use; not qualified for automotive programs requiring halogen-free materials. | Select SMB8J22CAHE3/H only if halogen-free compliance is not mandated by OEM material declaration requirements. |
| SMAJ22CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W), same VWM/VBR/VC ratings. | Suitable for space-constrained consumer electronics but derates faster above 75 °C; not AEC-Q101 qualified. | Choose SMAJ22CA only for non-automotive, low-power applications where board area is critical and thermal margin exceeds 50 °C. |
Compared with SMB8J22CAHM3/H, SMB8J22CAHE3/H offers identical surge performance but lacks halogen-free validation, while SMAJ22CA trades 50 % peak power and automotive qualification for 30 % smaller footprint - making SMB8J22CAHM3/H the sole choice for AEC-Q101-compliant, high-energy, halogen-free designs.
Availability
SMB8J22CAHM3/H is available at Aetrix Electronics and suitable for automotive body control modules, industrial RS-485 networks, and consumer appliance motor drivers requiring stable component supply, long-lifecycle support, and certified halogen-free materials.
Supply support for SMB8J22CAHM3/H 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 reliability, efficiency, and application-specific optimization.
The SMB8JxxCA series delivers high-power-density TVS solutions engineered for automotive and industrial environments where AEC-Q101 validation, bidirectional clamping, and robust surge immunity are mandatory.
FAQ
What is the clamping voltage of SMB8J22CAHM3/H at its rated peak pulse current?
The SMB8J22CAHM3/H has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current (IPPM) of 22.5 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry remains below critical overvoltage thresholds during standardized surge events such as ISO 7637-2 Pulse 5a. The SMB8J22CAHM3/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMB8J22CAHM3/H suitable for automotive applications?
Yes, SMB8J22CAHM3/H is AEC-Q101 qualified and specifically designed for automotive use. Its qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling, and ESD immunity - all required for integration into engine control units, body control modules, and ADAS sensor interfaces. The HM3 suffix confirms halogen-free, RoHS-compliant construction aligned with automotive material declarations. SMB8J22CAHM3/H meets ISO 16750 and ISO 7637 immunity requirements when applied per Vishay's recommended PCB layout.
How does the SMB8J22CAHM3/H differ from unidirectional variants like SMB10J22A?
SMB8J22CAHM3/H is bidirectional with symmetrical clamping for both polarities, whereas SMB10J22A is unidirectional and requires correct cathode orientation relative to system ground. SMB8J22CAHM3/H has lower peak pulse power (800 W vs 1000 W) and lower IPPM (22.5 A vs 28.2 A) due to bidirectional architecture trade-offs. Both share identical VWM (22 V) and VC (35.5 V), but SMB8J22CAHM3/H eliminates polarity marking and supports AC-coupled lines - making SMB8J22CAHM3/H preferred for CAN, LIN, and RS-485, while SMB10J22A suits DC power rail protection.
What is the thermal resistance of SMB8J22CAHM3/H, and how does it affect layout design?
SMB8J22CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This means that at 800 W peak power, junction temperature rise above ambient is ~57.6 °C - well within its 150 °C max rating if ambient stays below 92 °C. To achieve this, PCB layout must replicate the specified pad dimensions and avoid thermal bottlenecks; reducing pad size increases RθJA and risks thermal runaway during repeated surges. SMB8J22CAHM3/H does not require heatsinking in typical automotive or industrial duty cycles.
Does SMB8J22CAHM3/H have a defined polarity marking, and how is it identified on the device?
No, SMB8J22CAHM3/H has no polarity marking because it is a bidirectional TVS diode - both terminals are functionally identical and interchangeable in circuit layout. Unlike unidirectional variants (e.g., SMB10J22A) that feature a cathode band, SMB8J22CAHM3/H is unmarked per Vishay's mechanical drawing and ordering documentation. This absence of marking simplifies automated placement and eliminates orientation errors during assembly. Designers must rely on schematic symbol polarity (bidirectional arrow) rather than physical markings when verifying SMB8J22CAHM3/H placement.
SMB8J22CAHM3/H 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/H FAQ
1.How can I place an order for SMB8J22CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J22CAHM3/H 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/H reliable?
The price and inventory of SMB8J22CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J22CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J22CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J22CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J22CAHM3/H?
SMB8J22CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J22CAHM3/H 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/H?
For technical support, including SMB8J22CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J22CAHM3/H requirements.
6.How does Aetrix verify that SMB8J22CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J22CAHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMB8J22CAHM3/H?
All SMB8J22CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J22CAHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMB8J22CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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