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Vishay General Semiconductor - Diodes Division SMB8J12CA-M3/5B
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- Part No.:
- SMB8J12CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CA-M3/5B.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,263
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Product details
Overview
SMB8J12CA-M3/5B 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 SMB8J12CA-M3/5B datasheet, SMB8J12CA-M3/5B pinout, SMB8J12CA-M3/5B application, or SMB8J12CA-M3/5B equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
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 behavior and low incremental surge resistance, while the bidirectional configuration enables symmetric clamping across both polarities without polarity-sensitive layout constraints.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and delivers 40.2 A IPPM under standardized 10/1000 μs surge conditions - validated with derating above TA = 25 °C per Fig. 2 of Vishay Doc. #88422.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - maximum continuous reverse voltage before clamping activation; defines safe operating margin below circuit supply rails. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - guaranteed conduction onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 19.9 V at 40.2 A IPPM - peak voltage seen by protected circuit during worst-case 10/1000 μs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 800 W - maximum transient energy absorption capability; supports robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| ID (Reverse Leakage) | 5.0 μA at VWM - negligible standby current; avoids signal distortion or power loss in high-impedance sensor lines. |
| TJ max. | +150 °C - enables operation in under-hood automotive environments and thermally constrained industrial enclosures. |
| AEC-Q101 Qualified | Yes - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated terminals solderable per J-STD-002/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 function identically; bidirectional clamping allows connection across any two points needing voltage limiting - no directional routing required. |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94 V-0 flammability rating; thermal resistance RθJA = 72 °C/W enables dissipation on standard PCB copper pads (0.2" × 0.2"). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485, sensor bridges) without polarity awareness. |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control modules, ADAS sensors, and body electronics with extended lifetime requirements. |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes voltage overshoot during surge events - critical for protecting 12 V rail-connected microcontrollers and analog front-ends. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced damage - eliminates baking requirement for high-volume SMT assembly. |
| Halogen-free (M3 suffix) | Meets environmental compliance mandates for automotive OEMs and industrial equipment exporters requiring IEC 61249-2-21 adherence. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and temperature/pressure sensor outputs in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between signal line and ground, clamping spikes before they reach ASIC input pins. Use Value: Limits voltage to ≤19.9 V during 40.2 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V sensor signal conditioning ICs. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V industrial field wiring subject to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across input terminal and common rail, absorbing repetitive 800 W transients without degradation. Use Value: Maintains system uptime by eliminating false triggering and component failure caused by >1 kV fast-rising transients on factory floor wiring. |
| USB Port ESD Protection | DC Power Rail Surge Suppression |
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) in automotive infotainment head units per IEC 61000-4-2 Level 4 (±15 kV air). IC Role / Device Role / Timing Role: Low-capacitance shunt element placed adjacent to connector, diverting ESD current away from USB PHY transceiver. Use Value: Achieves sub-20 V clamping with <5 μA leakage - preserves signal integrity while meeting automotive EMC validation requirements. |
Use Scenario: Back-to-back protection of 12 V DC power inputs in telematics control units subjected to load dump per ISO 16750-2 (up to 35 V, 400 ms). IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor, clamping sustained overvoltage to safe levels for downstream DC/DC converters. Use Value: Absorbs 800 W peak power without thermal runaway, enabling compact design versus multi-stage protection schemes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-M3/5B | Unidirectional variant with identical VWM, VC, and PPPM but asymmetric clamping (cathode-anode polarity); requires correct orientation during placement. | Restricted to DC-biased lines where polarity is fixed (e.g., 12 V supply rail to ground); unsuitable for AC or floating signals. | Select only when unidirectional behavior is required and board layout accommodates polarity marking. |
| SMAJ12CA-M3/5B | Same electrical specs but in smaller SMA (DO-214AC) package; lower thermal mass and 600 W PPPM rating (vs. 800 W). | Limited to lower-energy transients; not recommended for automotive load dump or industrial 24 V I/O where full 800 W capability is needed. | Choose for space-constrained consumer designs where 600 W surge margin suffices and thermal budget permits higher RθJA. |
Compared with SMBJ12CA-M3/5B and SMAJ12CA-M3/5B, SMB8J12CA-M3/5B uniquely combines bidirectional symmetry, 800 W surge capacity, and AEC-Q101 qualification - making it the preferred choice for automotive and industrial applications demanding polarity-agnostic, high-energy clamping in SMB footprint.
Availability
SMB8J12CA-M3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, USB port ESD hardening, and DC power rail surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J12CA-M3/5B 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 portfolio, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J12CA-M3/5B at its rated peak pulse current?
The SMB8J12CA-M3/5B has a maximum clamping voltage (VC) of 19.9 V at 40.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured and guaranteed per Vishay Document #88422, ensuring predictable voltage limiting during surge events without exceeding safe thresholds for downstream 12 V logic or analog circuits.
Is SMB8J12CA-M3/5B suitable for automotive applications?
Yes, SMB8J12CA-M3/5B is AEC-Q101 qualified and explicitly listed in Vishay's automotive-grade ordering codes (HM3 suffix). Its construction - including glass-passivated junction, MSL Level 1 reflow rating, and -55 °C to +150 °C operating range - validates its use in engine control units, ADAS sensors, and body electronics per automotive reliability standards.
How does the bidirectional nature of SMB8J12CA-M3/5B affect PCB layout?
The SMB8J12CA-M3/5B has no polarity marking and functions identically in either direction, eliminating cathode/anode orientation constraints during placement. This simplifies layout for AC-coupled or floating signal lines (e.g., CAN, RS-485), reduces risk of assembly error, and avoids need for silkscreen polarity indicators - directly supporting automated optical inspection and high-yield SMT processes.
What is the thermal resistance of SMB8J12CA-M3/5B, and how does it impact power dissipation?
SMB8J12CA-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" copper pads. This value determines steady-state temperature rise under continuous leakage or repeated surges; for example, 100 mW average dissipation causes ~7.2 °C rise - well within the +150 °C TJ limit even in sealed enclosures.
Does SMB8J12CA-M3/5B meet halogen-free and RoHS requirements?
Yes, the "M3" suffix in SMB8J12CA-M3/5B denotes halogen-free, RoHS-compliant construction per IEC 61249-2-21 and EU Directive 2011/65/EU. Vishay confirms this material categorization in Document #88422, and the device carries no brominated flame retardants or chlorine-based compounds - satisfying strict environmental mandates for automotive and industrial OEMs.
SMB8J12CA-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMB8J12CA-M3/5B FAQ
1.How can I place an order for SMB8J12CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CA-M3/5B 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 SMB8J12CA-M3/5B reliable?
The price and inventory of SMB8J12CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J12CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J12CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CA-M3/5B?
SMB8J12CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CA-M3/5B 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 SMB8J12CA-M3/5B?
For technical support, including SMB8J12CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CA-M3/5B requirements.
6.How does Aetrix verify that SMB8J12CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J12CA-M3/5B 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 SMB8J12CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J12CA-M3/5B?
All SMB8J12CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CA-M3/5B, 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 SMB8J12CA-M3/5B part is unused and in its original packaging.
Return procedure for SMB8J12CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CA-M3/5B Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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