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Vishay General Semiconductor - Diodes Division SMBJ12CAHM3_B/H
- Part No.:
- SMBJ12CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CAHM3_B/H.pdf
- Description:
- 600W,12V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,006
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Product details
Overview
SMBJ12CAHM3_B/H 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 a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤19.9 V at 30.2 A peak surge current - used for protecting MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ12CAHM3_B/H datasheet, SMBJ12CAHM3_B/H pinout, SMBJ12CAHM3_B/H application, or SMBJ12CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, 19.9 V max clamping voltage at rated IPPM, JEDEC-compliant SMB package footprint, and halogen-free RoHS compliance per Vishay HM3 suffix.
Technical Context
This TVS diode operates symmetrically in both polarities due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<5 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature under defined PCB pad layout.
The device meets MSL Level 1 per J-STD-020 with 260 °C reflow peak, and its 600 W surge rating applies to non-repetitive 10/1000 µs waveform pulses at 0.01% duty cycle. Clamping performance is characterized at 30.2 A IPPM, delivering predictable overvoltage limiting for transient events induced by inductive switching or ESD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - maximum continuous reverse working voltage before significant conduction begins |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - guaranteed conduction onset range defining clamping threshold start point |
| VC (Clamping Voltage) | ≤19.9 V at 30.2 A IPPM - maximum voltage seen across terminals during 10/1000 µs surge, critical for downstream IC survival |
| PPPM (Peak Pulse Power) | 600 W - surge energy handling capacity under standardized 10/1000 µs waveform, derated above 25 °C |
| ID (Reverse Leakage) | ≤5 µA at 12 V - minimal standby current ensuring negligible power loss and signal integrity impact |
| Package | SMB (DO-214AA) - industry-standard 2-pin surface-mount outline with 5.21 mm × 4.06 mm body and 2.20 mm height |
| Operating Temperature | −55 °C to +150 °C - qualified for harsh environments including industrial motor drives and outdoor telecom nodes |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (Pin 1 & Pin 2) | Bidirectional transient path | Identical terminals; either pin serves as cathode or anode depending on instantaneous voltage polarity - enables AC line or differential pair protection without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 24 V DC rails without derating |
| Low clamping ratio (VC/VBR ≈ 1.41) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic inputs below destructive thresholds during transients |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets IPC-1752A material declaration requirements and automotive OEM environmental mandates without compromising surge performance |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without pre-baking or special handling - reduces manufacturing cost and risk |
| 150 °C max junction temperature | Allows deployment in enclosed enclosures or near heat-generating components (e.g., power supplies, motor drivers) without thermal shutdown |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
|
Use Scenario: Protection of gate driver signal lines against inductive kickback from 24 V solenoid valves and relay coils. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at MOSFET gate input to limit voltage excursions during turn-off. Use Value: Prevents gate oxide rupture in logic-level MOSFETs by clamping spikes to ≤19.9 V, extending system reliability in factory automation PLCs. |
Use Scenario: Surge suppression on LIN bus lines in door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary TVS on bidirectional LIN physical layer, absorbing fast transients before they reach transceiver IC input pins. Use Value: Maintains LIN communication integrity during ISO 7637-2 Pulse 1/2a events by limiting line voltage to safe levels without signal distortion. |
| Telecom Power Feeds | Consumer Sensor Interfaces |
|
Use Scenario: Overvoltage protection on −48 V DC telecom power distribution boards subject to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-stage TVS parallel to bulk capacitance, clamping residual transients after primary MOV/GDT stages. Use Value: Adds precise low-clamp margin (19.9 V) to protect downstream DC-DC converters and PMICs rated for ≤36 V absolute max input. |
Use Scenario: ESD and cable discharge protection on I²C lines connecting ambient light and proximity sensors to MCU in smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance (typ. 250 pF at 0 V) bidirectional clamp on differential data pair, preserving signal rise/fall times. Use Value: Passes IEC 61000-4-2 ±8 kV contact discharge testing while maintaining <10 ns response time and minimal signal attenuation. |
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_B/H | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification required by some automotive Tier 1s and EU industrial programs | Select SMBJ12CAHE3_B/H only if halogen-free status is not mandated in BOM compliance documentation |
| SMAJ12CAHM3 | Lower PPPM (400 W), larger VBR tolerance (13.3–15.8 V), same SMB footprint | Insufficient for 600 W surge requirements in industrial 24 V control systems per IEC 61000-4-5 | Use SMAJ12CAHM3 only in space-constrained designs where 400 W rating suffices and thermal margin allows higher VC |
Compared with SMBJ12CAHE3_B/H and SMAJ12CAHM3, SMBJ12CAHM3_B/H uniquely delivers 600 W surge capability in a halogen-free, AEC-Q101-qualified package - making it the only choice for high-reliability 24 V industrial and automotive body electronics requiring full environmental and surge compliance.
Availability
SMBJ12CAHM3_B/H is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and telecom power feed applications requiring stable component supply, halogen-free compliance, and repeatable 600 W transient suppression performance.
Supply support for SMBJ12CAHM3_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, rectifiers, and protection devices with emphasis on reliability, power efficiency, and automotive qualification.
SMBJ12CAHM3_B/H belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh-environment applications where consistent clamping voltage and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ12CAHM3_B/H at its rated peak pulse current?
The SMBJ12CAHM3_B/H has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current (IPPM) of 30.2 A under the standard 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 - a key parameter for ensuring downstream ICs remain within their absolute maximum ratings. The SMBJ12CAHM3_B/H achieves this with a clamping ratio of approximately 1.41 relative to its minimum VBR.
Is SMBJ12CAHM3_B/H suitable for automotive applications?
Yes, SMBJ12CAHM3_B/H is AEC-Q101 qualified (denoted by the HM3 suffix), making it suitable for automotive body electronics such as door modules, lighting controllers, and LIN bus interfaces. It meets stringent requirements for temperature cycling, humidity resistance, and surge robustness. The SMBJ12CAHM3_B/H also complies with halogen-free and RoHS directives required by major Tier 1 suppliers - confirmed in Vishay's official ordering information and qualification reports.
How does the bidirectional design of SMBJ12CAHM3_B/H affect its PCB layout?
The bidirectional design of SMBJ12CAHM3_B/H eliminates polarity constraints during placement - there is no cathode band or marking, and either terminal functions identically under positive or negative transients. This simplifies PCB layout for AC-coupled lines, differential buses (e.g., RS-485, LIN), or ungrounded signal paths. Unlike unidirectional TVS diodes, the SMBJ12CAHM3_B/H requires no orientation verification during automated assembly, reducing placement errors and inspection overhead.
What is the thermal resistance of SMBJ12CAHM3_B/H, and how does it impact power dissipation?
SMBJ12CAHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" copper pads per terminal. This means a 5.0 W steady-state power dissipation (PD) would raise junction temperature by 500 °C above ambient - but PD is specified for continuous operation, whereas SMBJ12CAHM3_B/H is intended for transient suppression. Its 600 W PPPM rating applies only to short-duration pulses (≤50 ms), so thermal design focuses on PCB copper area, not heatsinking. The SMBJ12CAHM3_B/H remains within its −55 °C to +150 °C TJ range under proper layout.
Does SMBJ12CAHM3_B/H meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMBJ12CAHM3_B/H 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 baking or dry-packaging is required prior to assembly, reducing manufacturing complexity and cost. This MSL rating is verified through Vishay's qualification testing and documented in the device's mechanical and packaging specifications - confirming the SMBJ12CAHM3_B/H's suitability for high-volume SMT production without moisture-related defects.
SMBJ12CAHM3_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):
- 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/H FAQ
1.How can I place an order for SMBJ12CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CAHM3_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 SMBJ12CAHM3_B/H reliable?
The price and inventory of SMBJ12CAHM3_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 SMBJ12CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ12CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CAHM3_B/H?
SMBJ12CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CAHM3_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 SMBJ12CAHM3_B/H?
For technical support, including SMBJ12CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ12CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ12CAHM3_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 SMBJ12CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ12CAHM3_B/H?
All SMBJ12CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CAHM3_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 SMBJ12CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ12CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CAHM3_B/H Tags
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