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Vishay General Semiconductor - Diodes Division SMB8J22CAHM3_A/H
- Part No.:
- SMB8J22CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J22CAHM3_A/H.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
SMB8J22CAHM3_A/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, and 800 W peak pulse power (10/1000 µs waveform), qualified to AEC-Q101 for automotive electronics.
For engineers reviewing the SMB8J22CAHM3_A/H datasheet, SMB8J22CAHM3_A/H pinout, SMB8J22CAHM3_A/H application, or SMB8J22CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 22 V), but triggers into low-impedance conduction when transients exceed VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
The SMB8J22CAHM3_A/H is engineered for unclamped inductive switching events (e.g., relay coil flyback) and lightning-induced surges per IEC 61000-4-5. Thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead) supports reliable operation up to +150 °C junction temperature with appropriate PCB copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected line. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - guaranteed breakdown onset window; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 35.5 V at 22.5 A - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream circuitry. |
| PPPM | 800 W - peak pulse power handling (10/1000 µs); enables protection against high-energy transients without failure. |
| IPPM | 22.5 A - peak pulse current capacity; sets minimum surge current threshold that will be safely clamped. |
| TJ max | +150 °C - maximum junction temperature; allows operation in under-hood automotive environments with proper thermal design. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking; matte tin-plated leads, RoHS-compliant and halogen-free (HM3 suffix), MSL Level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (either end) | Transient return path (bidirectional) | Either terminal serves as current sink during positive or negative transients; symmetric conduction eliminates orientation constraints. |
| Cathode (either end) | Transient return path (bidirectional) | Functionally identical to anode in bidirectional TVS; no cathode band marking required per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or differential signal lines (e.g., CAN, LIN, sensor bridges) without polarity concerns or external rectification. |
| AEC-Q101 qualification | Validated for automotive powertrain, body control, and ADAS modules requiring zero-defect reliability over 15+ year service life. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs-critical for 3.3 V or 5 V logic interfaces with tight absolute maximum ratings. |
| MSL Level 1 rating | Enables standard reflow soldering without baking; eliminates moisture-related popcorning risk during assembly. |
| Glass-passivated junction | Ensures stable VBR over time and temperature, low leakage (<1 µA at VWM), and robust surge endurance across 1000+ pulses. |
Applications
| Automotive Sensor Interface Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting analog output sensors (e.g., pressure, temperature) connected to MCU ADC inputs in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS placed between sensor signal line and ground, clamping transients before they reach precision amplifier or ADC input stage. Use Value: Prevents ADC saturation, latch-up, or permanent damage from ±100 V/50 ms load dump events while maintaining <1 µA leakage at 22 V operating point. |
Use Scenario: Safeguarding CANH/CANL differential pair in vehicle infotainment gateways subjected to ISO 7637-2 Pulse 1, 2a, and 5a. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across CANH–CANL to clamp common-mode surges and prevent transceiver latch-up or bus dominant state corruption. Use Value: Maintains CAN bit timing integrity by limiting differential voltage excursion to ≤35.5 V during 22.5 A surge, preserving data link layer compliance. |
| Industrial PLC Digital Input Protection | Telecom Line Card Surge Defense |
|
Use Scenario: Shielding 24 V DC digital input channels on programmable logic controllers from inductive kickback caused by solenoid valve switching. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between field input and optocoupler input, absorbing 800 W surges without degradation. Use Value: Extends optocoupler lifetime by limiting reverse voltage across LED to ≤35.5 V during 100 ns–1 ms transients, avoiding forward conduction failure. |
Use Scenario: Protecting Ethernet PHY interface pins (e.g., MDI-X) on telecom access equipment from lightning-induced surges per IEC 61000-4-5 Level 4 (4 kV). IC Role / Device Role / Timing Role: Bidirectional TVS installed on each twisted-pair line (TX+/TX−, RX+/RX−) referenced to chassis ground. Use Value: Clamps induced common-mode voltages to <35.5 V within 1 ns response time, preventing PHY ESD diode avalanche and packet loss. |
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_A/H | Same electrical specs, RoHS-compliant but not halogen-free; uses standard SnPb-equivalent matte tin plating (E3 vs HM3). | Lacks halogen-free certification; acceptable for commercial/industrial use but not automotive Tier-1 supply chain requirements. | Select when AEC-Q101 is unnecessary and cost optimization is prioritized over halogen-free compliance. |
| SMAJ22CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W), same VWM/VC ratings. | Insufficient for 800 W surge events; limited to lower-energy interfaces like USB or I²C where board space is constrained. | Choose only for space-constrained non-automotive designs with verified <400 W threat profiles and no AEC-Q101 mandate. |
Compared with SMB8J22CAHE3_A/H, the SMB8J22CAHM3_A/H adds halogen-free compliance for automotive supply chains; compared with SMAJ22CA, it delivers double the surge power handling and superior thermal performance in a slightly larger but still SMT-compatible SMB footprint.
Availability
SMB8J22CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, CAN bus nodes, industrial PLC inputs, and telecom line card protection requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMB8J22CAHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power density, and automotive qualification.
The SMB8J22CAHM3_A/H belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power, high-reliability transient suppression in harsh automotive and industrial environments where surge immunity and long-term stability are critical.
FAQ
What is the clamping voltage of SMB8J22CAHM3_A/H at its rated peak pulse current?
The SMB8J22CAHM3_A/H has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current (IPPM) of 22.5 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry downstream will not experience more than 35.5 V during such a surge event. The SMB8J22CAHM3_A/H maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMB8J22CAHM3_A/H suitable for protecting CAN FD physical layer interfaces?
Yes, SMB8J22CAHM3_A/H is suitable for CAN FD protection due to its bidirectional operation, 22 V stand-off voltage aligned with typical CAN common-mode range, and fast sub-nanosecond response time. Its 35.5 V clamping voltage ensures the transceiver remains within safe operating area during ISO 7637-2 Pulse 5a events. The SMB8J22CAHM3_A/H's AEC-Q101 qualification further validates its robustness for automotive serial bus applications including CAN FD.
Does SMB8J22CAHM3_A/H require a heatsink for 800 W surge dissipation?
No, SMB8J22CAHM3_A/H does not require an external heatsink for single-event 800 W surge dissipation because the 10/1000 µs pulse duration results in extremely short thermal time constants-energy is absorbed transiently by the silicon junction. However, PCB layout must follow Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal to ensure adequate heat spreading and sustained thermal resistance (RθJA = 72 °C/W). The SMB8J22CAHM3_A/H relies on copper mass, not heatsinks, for effective transient thermal management.
How does the HM3 suffix in SMB8J22CAHM3_A/H differ from E3 or HE3?
"HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, whereas "E3" is RoHS-compliant commercial grade without halogen-free assurance, and "HE3" is RoHS-compliant and AEC-Q101-qualified but not halogen-free. The SMB8J22CAHM3_A/H meets automotive Tier-1 material restrictions (e.g., JESD201 Class 2 whisker resistance, UL 94 V-0 molding compound) and is traceable to Vishay's certified automotive production line-making it mandatory for modern vehicle ECUs where HM3 is specified.
Can SMB8J22CAHM3_A/H replace SMBJ22CA in an existing design?
SMB8J22CAHM3_A/H is not a direct replacement for SMBJ22CA: although both are bidirectional 22 V TVS diodes in SMB packages, SMBJ22CA has 600 W PPPM and 17.5 A IPPM, while SMB8J22CAHM3_A/H delivers 800 W and 22.5 A. Substituting requires verification that downstream components can withstand the higher clamping energy and that PCB copper area meets the 5.0 mm × 5.0 mm pad requirement. The SMB8J22CAHM3_A/H also carries stricter automotive qualifications not present in standard SMBJ series.
SMB8J22CAHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMB8J22CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J22CAHM3_A/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_A/H reliable?
The price and inventory of SMB8J22CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J22CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J22CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J22CAHM3_A/H?
SMB8J22CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J22CAHM3_A/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_A/H?
For technical support, including SMB8J22CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J22CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J22CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J22CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J22CAHM3_A/H?
All SMB8J22CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J22CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMB8J22CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J22CAHM3_A/H Tags
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