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Vishay General Semiconductor - Diodes Division SMBJ12CAHM3_B/I
- Part No.:
- SMBJ12CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CAHM3_B/I.pdf
- Description:
- 600W,12V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,157
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Product details
Overview
SMBJ12CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage at 30.2 A peak pulse current (10/1000 µs), and 600 W peak pulse power dissipation - deployed to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ12CAHM3_B/I datasheet, SMBJ12CAHM3_B/I pinout, SMBJ12CAHM3_B/I application, or SMBJ12CAHM3_B/I equivalent, this device is evaluated for ESD and surge protection in bidirectional AC-coupled interfaces, automotive body electronics, and I/O port hardening where low clamping voltage and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 13.3 V to 14.7 V at 1.0 mA test current and reverse leakage ≤5.0 µA at 12 V. Its junction capacitance is not specified in the datasheet, but thermal resistance (RθJA) is 100 °C/W, supporting operation up to +150 °C junction temperature.
The device complies with AEC-Q101 qualification (indicated by HM3 suffix), uses glass-passivated silicon junctions, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It delivers 600 W transient suppression under 10/1000 µs waveform at 0.01% duty cycle, with low incremental surge resistance enhancing clamping consistency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 13.3 V / 14.7 V at 1.0 mA - Confirmed bidirectional breakdown threshold; ensures symmetrical overvoltage triggering in AC paths. |
| VC @ IPPM | 19.9 V at 30.2 A - Clamped voltage during 10/1000 µs surge; limits stress on downstream components like microcontrollers or transceivers. |
| PPPM | 600 W - Peak pulse power handling capability; enables robust protection against lightning-induced surges and inductive switching spikes. |
| ID @ VWM | ≤5.0 µA - Low reverse leakage at rated stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance nodes. |
| TJ max | +150 °C - Maximum junction temperature rating; supports deployment in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow assembly. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no polarity marking; terminals are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; reverse-biased path during negative transients | One side of symmetrical junction - participates identically in both polarity clamping events. |
| Cathode | Current exit terminal in forward bias; reverse-biased path during positive transients | Other side of symmetrical junction - functionally identical to Anode due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without cascaded staging. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body control modules and infotainment I/O ports requiring reliability certification. |
| Low clamping voltage (19.9 V @ 30.2 A) | Reduces voltage overshoot margin below 24 V system rails, preserving logic-level compatibility of protected ICs. |
| MSL Level 1, 260 °C reflow peak | Eliminates pre-baking requirements and supports standard lead-free SMT processes without moisture-related delamination risk. |
| Glass passivated chip junction | Improves long-term stability of breakdown characteristics and reduces parameter drift under thermal cycling and humidity stress. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) from ESD and load dump coupling in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching precision DAC or op-amp circuitry. Use Value: Maintains signal integrity under ±8 kV contact ESD (IEC 61000-4-2) while adding <0.5 pF parasitic capacitance - negligible impact on loop bandwidth. |
Use Scenario: Hardening LIN bus transceiver I/O pins against battery reverse connection and alternator load dump in door module ECUs. IC Role / Device Role / Timing Role: Primary transient suppressor on LIN data line and VBAT-supply rail, operating in parallel with ceramic capacitors for multi-stage filtering. Use Value: Withstands 100 A surge (IFSM) and clamps to ≤19.9 V, preventing latch-up in TJA1020-class transceivers during ISO 7637-2 Pulse 5a events. |
| Telecom Power Supply Input | Consumer USB-C Port Protection |
Use Scenario: Safeguarding 12 V DC input stage of PoE-powered network switches against induced surges from nearby AC mains wiring. IC Role / Device Role / Timing Role: First-line TVS on primary DC input, coordinated with upstream fuse and downstream π-filter to meet UL 60950-1 surge immunity. Use Value: 600 W rating handles 10/1000 µs transients up to 30.2 A without degradation, enabling compliance with EN 61000-4-5 Level 4 (4 kV line-earth). |
Use Scenario: Bidirectional overvoltage protection on USB-C CC and VCONN lines exposed to hot-plug and adapter mismatch events. IC Role / Device Role / Timing Role: Standalone TVS placed adjacent to connector to clamp ±20 V faults before reaching USB PD controller or level shifters. Use Value: Symmetrical 12 V VWM and 19.9 V VC ensure equal protection for both CC1/CC2 polarity states, meeting USB IF ESD test plan requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CAHE3_B/I | Same electrical specs, RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial-grade industrial and telecom gear where automotive qualification is unnecessary. | Select when cost sensitivity outweighs halogen-free or automotive compliance requirements. |
| SMAJ12CAHM3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC but higher RθJA (140 °C/W). | Better suited for space-constrained consumer PCBs with lower surge exposure; not recommended for automotive or heavy industrial use. | Choose only if board area is critical and surge threat level is limited to IEC 61000-4-2 Level 2. |
Compared with SMBJ12CAHM3_B/I, the HE3 variant trades halogen-free construction and AEC-Q101 for lower cost, while the SMAJ12CAHM3_A/I sacrifices 33% pulse power and thermal performance for 30% smaller footprint - making SMBJ12CAHM3_B/I optimal for high-reliability bidirectional surge paths demanding full 600 W headroom and automotive qualification.
Availability
SMBJ12CAHM3_B/I is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, and telecom power supply input applications requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMBJ12CAHM3_B/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 supplier of discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMBJ series was developed specifically for robust, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising signal fidelity or layout density.
FAQ
What does the "HM3" suffix indicate in SMBJ12CAHM3_B/I?
The HM3 suffix in SMBJ12CAHM3_B/I denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. This means the device meets automotive reliability standards, contains no brominated flame retardants or chlorine-based compounds, and is validated for temperature cycling, humidity testing, and mechanical shock per AEC-Q101 - confirming its suitability for under-hood and chassis-mounted applications where material compliance and long-term stability are mandatory. SMBJ12CAHM3_B/I is fully traceable to Vishay's certified production lots.
Is SMBJ12CAHM3_B/I unidirectional or bidirectional, and how does that affect circuit placement?
SMBJ12CAHM3_B/I is a bidirectional TVS diode, indicated by the "CA" in its part number. Unlike unidirectional variants (e.g., SMBJ12A), it has no cathode band marking and provides symmetrical clamping for both positive and negative transients - making it ideal for AC-coupled lines, differential buses (e.g., RS-485, LIN), or any node where polarity reversal or floating reference is possible. Circuit placement requires no orientation check, simplifying layout and reducing assembly errors compared to unidirectional counterparts.
What is the maximum clamping voltage of SMBJ12CAHM3_B/I, and under what test condition is it specified?
The maximum clamping voltage of SMBJ12CAHM3_B/I is 19.9 V, measured at a peak pulse current (IPPM) of 30.2 A using the standardized 10/1000 µs double-exponential surge waveform. This value represents the worst-case voltage seen by downstream circuitry during a full-rated transient event and is guaranteed across the operating temperature range (−55 °C to +150 °C). It directly determines the safe overvoltage margin for protected ICs - for example, ensuring a 24 V system rail remains within safe operating limits during surge conditions.
Can SMBJ12CAHM3_B/I replace SMBJ12A in an existing design?
No - SMBJ12CAHM3_B/I cannot directly replace SMBJ12A without circuit review. While both share the same VWM (12 V) and package (SMB), SMBJ12A is unidirectional (cathode-marked) and intended for DC-biased lines, whereas SMBJ12CAHM3_B/I is bidirectional and unmarked. Substituting it into a unidirectional path may cause unintended conduction during normal forward bias. If bidirectional protection is required, verify that the application's signal topology (e.g., AC-coupled, floating ground) supports symmetrical clamping before migration.
Does SMBJ12CAHM3_B/I require derating at elevated ambient temperatures?
Yes - SMBJ12CAHM3_B/I requires thermal derating above TA = 25 °C, as shown in Figure 2 of the Vishay datasheet (Document Number: 88392). Its peak pulse power (PPPM) decreases linearly with rising ambient temperature: at 85 °C, PPPM drops to approximately 420 W (70% of rated 600 W); at 125 °C, it falls to ~240 W (40%). Designers must apply this derating when sizing for sustained high-temperature environments such as engine compartments or enclosed industrial enclosures, and confirm layout copper pad area (minimum 0.2" × 0.2") to maintain thermal performance.
SMBJ12CAHM3_B/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:
- 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):
- 30.2A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ12CAHM3_B/I FAQ
1.How can I place an order for SMBJ12CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CAHM3_B/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 SMBJ12CAHM3_B/I reliable?
The price and inventory of SMBJ12CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ12CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CAHM3_B/I?
SMBJ12CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CAHM3_B/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 SMBJ12CAHM3_B/I?
For technical support, including SMBJ12CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ12CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ12CAHM3_B/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 SMBJ12CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ12CAHM3_B/I?
All SMBJ12CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CAHM3_B/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 SMBJ12CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ12CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CAHM3_B/I Tags
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