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Vishay General Semiconductor - Diodes Division SMB8J14CAHM3_B/H
- Part No.:
- SMB8J14CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J14CAHM3_B/H.pdf
- Description:
- 800W,14V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,977
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Product details
Overview
SMB8J14CAHM3_B/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 14 V stand-off voltage (VWM), 23.2 V maximum clamping voltage (VC) at 34.5 A peak pulse current (IPPM), 800 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive electronics protection.
For engineers reviewing the SMB8J14CAHM3_B/H datasheet, SMB8J14CAHM3_B/H pinout, SMB8J14CAHM3_B/H application, or SMB8J14CAHM3_B/H equivalent, this device is selected for robust ESD and lightning surge suppression in automotive sensor interfaces, industrial I/O ports, and DC power rail protection where low-leakage (<1.0 µA at VWM) and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while MSL Level 1 rating supports lead-free reflow compatibility up to 260 °C peak.
The device delivers 800 W peak pulse power under 10/1000 µs waveform with clamping performance validated at TJ = 25 °C on 5.0 mm × 5.0 mm copper pads. Thermal resistance (RθJA = 72 °C/W) and junction temperature range (–55 °C to +150 °C) support operation in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins; defines safe signal swing margin in protected circuit. |
| VBR min/max | 15.6 V / 17.2 V - Breakdown voltage range at 1.0 mA test current; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM | 23.2 V - Clamping voltage at 34.5 A peak pulse current; limits transient overvoltage seen by downstream ICs. |
| IPPM | 34.5 A - Peak pulse current handling capability under 10/1000 µs waveform; determines survivability against ISO 7637-2 Pulse 1/2/5a surges. |
| PPPM | 800 W - Peak pulse power dissipation; enables protection against high-energy transients like load dump or inductive switching. |
| ID @ VWM | <1.0 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering in low-power systems. |
| TJ max | +150 °C - Maximum junction temperature; supports placement near heat sources in automotive ECUs and industrial controllers. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. No polarity marking - bidirectional symmetry eliminates cathode/anode orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals serve identical roles; bidirectional conduction allows single-device protection of AC or differential lines without routing constraints. |
| Cathode Band (absent) | Polarity indicator | Not applicable - bidirectional construction omits marking; PCB layout requires no orientation alignment. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for engine control, ADAS, and body electronics. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without pre-baking; reduces manufacturing complexity and cost in high-volume SMT lines. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage over lifetime; prevents parameter drift under thermal stress or humidity exposure. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >15 kV contact); improves clamping predictability versus silicon avalanche diodes. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets fire-safety requirements for enclosed automotive and industrial enclosures. |
Applications
| Automotive Sensor Interface | Industrial CAN Bus Line |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and outputs from battery line transients and ESD in vehicle door modules and seat control units. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching PHY IC. Use Value: Maintains signal integrity under ISO 16750-2 load dump (12 V system) and IEC 61000-4-2 ESD (±15 kV air) while adding zero propagation delay. |
Use Scenario: Safeguarding CAN FD physical layer against coupled surges from adjacent 24 V power wiring in factory automation PLCs. IC Role / Device Role / Timing Role: Common-mode TVS across CAN_H/CAN_L differential pair to suppress asymmetric transients without distorting data eye. Use Value: Clamps to 23.2 V within nanoseconds, preserving CAN bit timing and preventing bus lock-up during repetitive 10/1000 µs surges up to 34.5 A. |
| DC Power Rail Protection | USB Type-C Port ESD |
Use Scenario: Guarding 12 V/24 V input rails of embedded controllers against inductive kickback from solenoid drivers and relay coils. IC Role / Device Role / Timing Role: Primary overvoltage clamp parallel to bulk input capacitor, sized to absorb 800 W peak energy without thermal runaway. Use Value: Limits rail voltage excursion to ≤23.2 V during 100 ms load dump events, protecting downstream DC-DC converters and microcontrollers. |
Use Scenario: Integrated ESD protection for USB Type-C CC and VCONN pins in portable diagnostic tools and infotainment head units. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed immediately after connector to meet IEC 61000-4-2 Level 4 (±15 kV contact). Use Value: Delivers <1.0 µA leakage at 14 V stand-off, avoiding interference with CC logic detection while clamping ESD pulses below 23.2 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J14CAHE3_B/H | Same electrical specs and AEC-Q101 qualification; RoHS-compliant but not halogen-free (contains brominated flame retardant). | Acceptable for commercial/industrial use where halogen-free mandate does not apply; unsuitable for automotive OEMs requiring IEC 61249-2-21 compliance. | Select when cost sensitivity outweighs halogen-free requirement and supply chain allows non-HM3 variants. |
| SMAJ14CA | Lower 400 W PPPM, 27.2 V VC at 14.3 A IPPM, SMA (DO-214AC) package - smaller footprint but lower surge capacity. | Fit for lower-energy threats (e.g., IEC 61000-4-5 Level 3) in space-constrained consumer devices; insufficient for automotive load dump. | Choose only for non-automotive applications with verified surge profiles ≤400 W and board area too tight for SMB outline. |
Compared with SMB8J14CAHE3_B/H, the HM3 version adds halogen-free compliance without sacrificing surge rating or thermal performance; versus SMAJ14CA, SMB8J14CAHM3_B/H provides >2× peak power handling and tighter clamping in a slightly larger but industry-standard SMB footprint.
Availability
SMB8J14CAHM3_B/H is available at Aetrix Electronics and suitable for automotive electronics, industrial I/O protection, and DC power rail safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMB8J14CAHM3_B/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 and application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-reliability transient suppression in harsh-environment automotive and industrial systems where AEC-Q101 validation and precise clamping are mandatory.
FAQ
What is the clamping voltage of SMB8J14CAHM3_B/H at its rated peak pulse current?
The SMB8J14CAHM3_B/H has a maximum clamping voltage (VC) of 23.2 V at its specified peak pulse current (IPPM) of 34.5 A under the 10/1000 µs waveform. This value is measured at TA = 25 °C on recommended 5.0 mm × 5.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SMB8J14CAHM3_B/H maintains this clamping performance across its full operating temperature range.
Is SMB8J14CAHM3_B/H suitable for automotive applications?
Yes, SMB8J14CAHM3_B/H is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its –55 °C to +150 °C junction temperature range, MSL Level 1 reflow compatibility, and halogen-free construction meet Tier 1 supplier requirements for engine control units, body electronics, and ADAS sensors. The SMB8J14CAHM3_B/H is designated with the HM3 suffix to indicate full automotive-grade compliance.
How does the bidirectional configuration of SMB8J14CAHM3_B/H affect PCB layout?
The SMB8J14CAHM3_B/H has no polarity marking and operates identically in both directions, eliminating orientation constraints during automated placement. Unlike unidirectional TVS diodes, it requires no cathode band alignment on the PCB - simplifying layout, reducing assembly errors, and enabling symmetric placement across differential lines like CAN or RS-485. This symmetry also avoids signal distortion in AC-coupled paths.
What is the reverse leakage current of SMB8J14CAHM3_B/H at its stand-off voltage?
The SMB8J14CAHM3_B/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 14 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage preserves battery life in always-on automotive modules and prevents false triggering in high-impedance sensor interfaces. The SMB8J14CAHM3_B/H maintains leakage below 5.0 µA across its full operating temperature range.
Can SMB8J14CAHM3_B/H replace unidirectional TVS diodes in existing designs?
No - SMB8J14CAHM3_B/H is strictly bidirectional and cannot substitute for unidirectional TVS diodes in DC-biased circuits where forward conduction must be blocked. Attempting replacement may cause unintended current flow during normal operation. For unidirectional protection, use the SMB10J14A variant instead. The SMB8J14CAHM3_B/H is intended only for AC, differential, or floating-node applications requiring symmetrical clamping.
SMB8J14CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 14V
- Current - Peak Pulse (10/1000µs):
- 34.5A
- 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)
SMB8J14CAHM3_B/H FAQ
1.How can I place an order for SMB8J14CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J14CAHM3_B/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 SMB8J14CAHM3_B/H reliable?
The price and inventory of SMB8J14CAHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J14CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J14CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J14CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J14CAHM3_B/H?
SMB8J14CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J14CAHM3_B/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 SMB8J14CAHM3_B/H?
For technical support, including SMB8J14CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J14CAHM3_B/H requirements.
6.How does Aetrix verify that SMB8J14CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J14CAHM3_B/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 SMB8J14CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J14CAHM3_B/H?
All SMB8J14CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J14CAHM3_B/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 SMB8J14CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMB8J14CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J14CAHM3_B/H Tags
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