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Vishay General Semiconductor - Diodes Division SMB8J12CAHM3_A/I
- Part No.:
- SMB8J12CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CAHM3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,149
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Product details
Overview
SMB8J12CAHM3_A/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 a 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage (VC) at 40.2 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 SMB8J12CAHM3_A/I datasheet, SMB8J12CAHM3_A/I pinout, SMB8J12CAHM3_A/I application, or SMB8J12CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.66), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging an avalanche breakdown mechanism to shunt surge energy away from downstream ICs. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints, and its 1.0 µA max reverse leakage at VWM ensures minimal impact on low-power sensor bias networks.
The SMB8J12CAHM3_A/I exhibits 72 °C/W junction-to-ambient thermal resistance and 20 °C/W junction-to-lead resistance, supporting reliable operation up to +150 °C junction temperature. Its glass-passivated chip junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V at 1.0 mA - verified breakdown threshold range for production screening |
| VC @ IPPM | 19.9 V at 40.2 A - clamping voltage under full 800 W surge, limiting downstream stress |
| PPPM | 800 W (10/1000 µs) - standardized surge handling capacity for automotive ISO 7637-2 Pulse 1/2/5a |
| ID @ VWM | 5.0 µA max - negligible leakage current preserving signal integrity in high-impedance circuits |
| TJ max | +150 °C - supports under-hood automotive placement and industrial ambient conditions |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking required. Case dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for lead-free reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical electrical behavior in both directions; either terminal may connect to protected line or ground |
| Cathode band (absent) | Polarity indicator | Not present - confirms bidirectional configuration per SMB8JxxCA family designation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC JS709E and IPC-1752A material declarations for green electronics manufacturing |
| MSL Level 1 (260 °C peak) | Zero bake requirement prior to reflow; supports standard SMT processes without moisture sensitivity concerns |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes overvoltage exposure to protected ICs compared to alternatives with ratios >1.8 |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in engine control modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed between sensor signal line and chassis ground to clamp ±20 V transients within 1 ns response time. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V sensor front-ends while maintaining <5 µA leakage at 12 V system rail. | Use Scenario: Safeguarding PLC digital input channels against field-wiring surges and electrostatic discharge in factory automation systems. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines to absorb 800 W transients without affecting steady-state logic thresholds. Use Value: Enables robust operation across -40 °C to +85 °C ambient with no derating required up to 75 °C board temperature. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
Use Scenario: Shielding RS-485 transceiver data lines in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) referenced to common ground, suppressing common-mode transients up to ±1 kV. Use Value: Maintains signal integrity below 1 pF junction capacitance at zero bias, avoiding data rate degradation in 10 Mbps links. | Use Scenario: Secondary-level surge suppression on VBUS and D+/D- lines of USB 2.0 ports in smart home hubs subjected to user-handling ESD. IC Role / Device Role / Timing Role: Low-leakage bidirectional clamp absorbing IEC 61000-4-2 ±15 kV contact discharge energy before it reaches USB controller. Use Value: Complies with USB-IF ESD immunity requirements while adding <0.5 mm² PCB area versus discrete capacitor+TVS solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J12CAHE3_A/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Acceptable where halogen-free mandate is not enforced (e.g., non-EU commercial equipment) | Select when cost optimization is prioritized over green material compliance |
| SMAJ12CA | Lower PPPM (400 W), higher VC (23.2 V), SMA package (smaller footprint, lower thermal mass) | Suitable only for sub-400 W surge environments; limited to ≤85 °C ambient due to higher RθJA | Choose for space-constrained consumer designs with lower surge threat profiles |
Compared with SMB8J12CAHE3_A/I, the SMB8J12CAHM3_A/I adds halogen-free compliance without sacrificing performance; versus SMAJ12CA, it delivers double the surge power rating and superior thermal robustness - critical for automotive and industrial deployments requiring long-term reliability under repeated transient stress.
Availability
SMB8J12CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer USB port hardening requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J12CAHM3_A/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, 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-power, bidirectional surge suppression in harsh automotive and industrial environments where AEC-Q101 validation and stable clamping are mandatory.
FAQ
What is the clamping voltage of SMB8J12CAHM3_A/I at its rated peak pulse current?
The SMB8J12CAHM3_A/I has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current (IPPM) of 40.2 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for protected circuitry - a key parameter confirmed in Vishay document 88422, Table on page 3 (Bidirectional section).
Is SMB8J12CAHM3_A/I suitable for automotive applications?
Yes, SMB8J12CAHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets stress tests including temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 Rev G, making it appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under thermal and electrical stress is critical.
What does the "HM3" suffix mean in SMB8J12CAHM3_A/I?
The "HM3" suffix in SMB8J12CAHM3_A/I denotes halogen-free, RoHS-compliant construction meeting JEDEC JS709E and IPC-1752A material standards. It also indicates packaging in 13-inch tape-and-reel (I-code) with 3200 units per reel, and confirms AEC-Q101 qualification - distinguishing it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) variants.
How does SMB8J12CAHM3_A/I differ from unidirectional SMB10J12A?
SMB8J12CAHM3_A/I is bidirectional with symmetrical clamping for AC or differential signals, while SMB10J12A is unidirectional and requires correct polarity orientation. The SMB8J12CAHM3_A/I offers 800 W PPPM and 40.2 A IPPM, whereas SMB10J12A delivers 1000 W PPPM and 50.3 A IPPM - reflecting trade-offs between directionality and surge capacity within the same SMB package.
What is the thermal resistance of SMB8J12CAHM3_A/I, and how does it affect layout design?
SMB8J12CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W. To maintain TJ ≤ 150 °C under full 800 W surge, PCB copper pad area must follow Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal - undersized pads cause excessive temperature rise and premature failure during repetitive transients.
SMB8J12CAHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 40.2A
- 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)
SMB8J12CAHM3_A/I FAQ
1.How can I place an order for SMB8J12CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CAHM3_A/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 SMB8J12CAHM3_A/I reliable?
The price and inventory of SMB8J12CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J12CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J12CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CAHM3_A/I?
SMB8J12CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CAHM3_A/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 SMB8J12CAHM3_A/I?
For technical support, including SMB8J12CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CAHM3_A/I requirements.
6.How does Aetrix verify that SMB8J12CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J12CAHM3_A/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 SMB8J12CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J12CAHM3_A/I?
All SMB8J12CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CAHM3_A/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 SMB8J12CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMB8J12CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CAHM3_A/I Tags
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