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Vishay General Semiconductor - Diodes Division SMBJ12CAHM3/I
- Part No.:
- SMBJ12CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CAHM3/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,939
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Product details
Overview
SMBJ12CAHM3/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 or power lines. It features 12 V standoff voltage (VWM), 13.3–14.7 V breakdown range at 1 mA, 19.9 V maximum clamping voltage at 30.2 A peak pulse current (10/1000 µs), and 600 W peak pulse power rating - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ12CAHM3/I datasheet, SMBJ12CAHM3/I pinout, SMBJ12CAHM3/I application, or SMBJ12CAHM3/I equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, AEC-Q101 qualification status, thermal resistance data, and real-world use context for surge protection design validation.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, IPPM, and VC specifications in forward and reverse directions. Its glass-passivated junction ensures stable avalanche performance under repetitive 10/1000 µs surges at 0.01% duty cycle, while low incremental surge resistance enables tight clamping during fast transients.
The device is halogen-free and RoHS-compliant (HM3 suffix), qualified to AEC-Q101 for automotive-grade reliability, and rated for operation from –55 °C to +150 °C junction temperature. Thermal resistance is 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), supporting PCB-level thermal management on standard 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse stand-off voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - Verified breakdown range ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 19.9 V at 30.2 A - Clamped voltage during 600 W 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling capability; supports robust protection against lightning-induced or inductive-switching surges. |
| IPPM | 30.2 A - Peak pulse current capacity at VC; sets minimum trace width and fuse coordination requirements. |
| TJ max | +150 °C - Maximum junction temperature; enables deployment in high-ambient environments like engine control units. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs derating above 25 °C ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no band marking required. |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; forms symmetrical clamping path for ± transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients common in industrial motor drives and telecom line surges. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body electronics and infotainment power rails. |
| Halogen-free, RoHS-compliant | Meets environmental compliance requirements for global OEM and industrial equipment shipments. |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly without moisture sensitivity handling restrictions. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to relay coil kickback in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS clamps ±1 kV EFT bursts and inductive spikes before they reach ADC input or op-amp buffer stages. Use Value: Prevents sensor signal corruption and microcontroller reset events caused by sub-100 ns transients exceeding 15 V. |
Use Scenario: Safeguarding LIN bus transceiver I/O pins against load dump and jump-start induced surges in door module ECUs. IC Role / Device Role / Timing Role: Fast-response clamping element placed directly at connector entry point to limit voltage seen by transceiver IC. Use Value: Maintains LIN communication integrity during 12 V system transients up to 30 V peak, per ISO 16750-2 Pulse 5a. |
| Telecom Line Interface | Power Supply Input Stage |
|
Use Scenario: Shielding RS-485 transceiver inputs on base station backhaul cards from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary front-end transient suppressor in series with gas discharge tube (GDT) for hybrid protection architecture. Use Value: Limits let-through voltage to <20 V during 6 kV/3 kA combination wave tests, preserving transceiver latch-up immunity. |
Use Scenario: Secondary surge suppression on 24 V DC input rail of programmable logic controller (PLC) power supply. IC Role / Device Role / Timing Role: Fast-acting clamp downstream of primary MOV to handle residual fast-rising transients missed by bulk suppressors. Use Value: Reduces voltage overshoot to <25 V during 10/1000 µs surges, preventing damage to upstream rectifier diodes and bulk capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CAHE3/I | Same electrical specs, but RoHS-compliant without halogen-free certification; not AEC-Q101 qualified. | Suitable for commercial/industrial use where automotive qualification is unnecessary. | Select when halogen-free requirement is waived and cost optimization is prioritized over automotive compliance. |
| SMAJ12CAHM3/I | Lower 400 W PPPM, higher VC (23.2 V), same VWM/VBR; SMA (DO-214AC) package with smaller footprint. | Better suited for space-constrained consumer electronics with lower surge threat levels. | Choose only if board area is critical and system-level surge testing confirms 400 W rating suffices. |
Compared with SMBJ12CAHM3/I, SMBJ12CAHE3/I trades AEC-Q101 and halogen-free compliance for lower cost, while SMAJ12CAHM3/I sacrifices 33% pulse power and clamping performance to reduce PCB area - making SMBJ12CAHM3/I optimal for automotive and high-reliability industrial designs demanding full 600 W capability.
Availability
SMBJ12CAHM3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom line protection requiring stable component supply across extended production lifecycles.
Supply support for SMBJ12CAHM3/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 SMBJ series targets high-energy transient suppression in harsh environments, engineered for automotive, industrial, and telecom systems where consistent clamping behavior and long-term stability under surge stress are mandatory.
FAQ
What is the clamping voltage of SMBJ12CAHM3/I at its rated peak pulse current?
The SMBJ12CAHM3/I has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current of 30.2 A under the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ12CAHM3/I maintains this clamping performance consistently across both polarities due to its bidirectional construction.
Is SMBJ12CAHM3/I suitable for automotive applications?
Yes, SMBJ12CAHM3/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive applications including body electronics, infotainment power supplies, and LIN/CAN node protection. Its –55 °C to +150 °C operating temperature range and validated surge endurance align with automotive environmental and reliability requirements defined in ISO 16750 and JESD22.
How does the bidirectional nature of SMBJ12CAHM3/I affect its placement in circuit design?
The SMBJ12CAHM3/I has no polarity marking and functions identically in either orientation, simplifying PCB layout for AC-coupled or floating signal paths such as RS-485 differential pairs or transformer-isolated power rails. Unlike unidirectional TVS diodes, it eliminates risk of incorrect orientation during assembly and provides symmetrical protection against both positive and negative transients without additional components.
What is the thermal resistance of SMBJ12CAHM3/I, and how does it impact layout?
SMBJ12CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard SMB footprint and influences derating: at 70 °C ambient, its 5.0 W steady-state power dissipation must be reduced to ~2.5 W. Layout should maintain recommended pad dimensions and avoid thermal isolation to ensure reliable long-term operation.
Does SMBJ12CAHM3/I meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMBJ12CAHM3/I meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C - fully compatible with standard lead-free soldering processes. No dry-packaging or baking is required prior to assembly, reducing manufacturing overhead and eliminating moisture-related defects such as popcorning during reflow.
SMBJ12CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMBJ12CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CAHM3/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/I reliable?
The price and inventory of SMBJ12CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ12CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CAHM3/I?
SMBJ12CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CAHM3/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/I?
For technical support, including SMBJ12CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CAHM3/I requirements.
6.How does Aetrix verify that SMBJ12CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ12CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ12CAHM3/I?
All SMBJ12CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ12CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CAHM3/I Tags
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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