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Vishay General Semiconductor - Diodes Division SMB10J12AHM3/I
- Part No.:
- SMB10J12AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB10J12AHM3/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,091
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Product details
Overview
SMB10J12AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on DC power rails and signal lines. It features a 12 V stand-off voltage (VWM), 19.9 V clamping voltage (VC) at 50.3 A peak pulse current (IPPM), and 1000 W peak pulse power (PPPM) with 10/1000 µs waveform - optimized for automotive-grade ESD and load-dump protection in engine control units and body electronics.
For engineers reviewing the SMB10J12AHM3/I datasheet, SMB10J12AHM3/I pinout, SMB10J12AHM3/I application, or SMB10J12AHM3/I equivalent, this AEC-Q101 qualified TVS delivers verified clamping performance, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for under-hood automotive designs requiring long-term reliability under thermal cycling and repetitive transients.
Technical Context
This device operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and stable breakdown behavior across -55 °C to +150 °C junction temperature range. Its 13.3–14.7 V breakdown voltage (VBR) at 1 mA ensures precise triggering above nominal 12 V system rails while maintaining low leakage (<5 µA at VWM).
The SMB10J12AHM3/I is rated for 100 A non-repetitive forward surge current (IFSM) and exhibits 72 °C/W junction-to-ambient thermal resistance (RθJA) when mounted on 5.0 mm × 5.0 mm copper pads - enabling robust thermal management in compact PCB layouts without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before conduction; defines safe DC rail margin for 12 V automotive systems |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - tight breakdown window ensures consistent turn-on across production lots and temperature |
| VC @ IPPM | 19.9 V at 50.3 A - clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 1/2a/5a transients |
| PPPM | 1000 W (10/1000 µs) - supports high-energy surge suppression in alternator load-dump scenarios |
| IFSM | 100 A (8.3 ms half-sine) - withstands repeated cranking surges without degradation |
| TJ max | +150 °C - enables placement near heat sources (e.g., power MOSFETs, DC/DC converters) in engine compartments |
| AEC-Q101 | Qualified - validated for automotive electronic modules per stress test requirements including HTOL, TCT, and ESD HBM/MM |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; forms current sink during transient clamping |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery feed); conducts avalanche current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMB package | Enables automated SMT placement and fits within 2.2 mm height constraints typical in automotive ECUs |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in under-hood environments |
| AEC-Q101 qualification | Validates reliability for automotive applications including extended temperature cycling and mechanical shock exposure |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking - simplifies manufacturing logistics |
| Halogen-free construction (HM3 suffix) | Meets automotive OEM environmental mandates (e.g., GMW3172, Ford WSS-M99P1111-A) without compromising surge capability |
Applications
| Engine Control Unit (ECU) Power Input | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 12 V supply rail against ISO 7637-2 Pulse 5a (load dump up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and input capacitor to clamp transients before LDOs and microcontrollers. Use Value: Limits voltage to ≤19.9 V during 50.3 A surge, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. |
Use Scenario: Safeguarding LIN bus transceiver power pins from coupled noise during door actuator switching. IC Role / Device Role / Timing Role: Local rail protector adjacent to transceiver IC, absorbing inductive kickback from solenoid drivers. Use Value: Sub-ns response prevents >12 V excursions from propagating into LIN PHY, maintaining bus integrity per ISO 17987-2. |
| Infotainment System USB Port | ADAS Camera Power Line |
Use Scenario: Suppressing ESD events (IEC 61000-4-2 ±15 kV contact) on VBUS line of USB 2.0 ports. IC Role / Device Role / Timing Role: First-line defense before USB switch or PMIC, shunting ESD current away from data lines. Use Value: 19.9 V clamping ensures VBUS stays below USB 2.0 absolute maximum rating (6.8 V) only if used with series impedance - confirms need for coordinated protection design. |
Use Scenario: Mitigating transients induced by nearby radar module switching on 12 V camera power feed. IC Role / Device Role / Timing Role: Point-of-load TVS on FAKRA connector input, placed before DC/DC converter feeding image sensor. Use Value: 1000 W PPPM rating handles coupled energy from 77 GHz radar RF front-end without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12AHE3/A | Same VWM (12 V), VC = 19.9 V, but rated for 600 W PPPM (vs. 1000 W); RoHS-compliant but not halogen-free | Lacks AEC-Q101 qualification and HM3 halogen-free compliance; suitable for commercial-grade infotainment, not under-hood use | Select when cost-sensitive non-automotive designs require basic 12 V rail protection without automotive qualification. |
| 1.5SMC12AH | Same electrical specs (VWM = 12 V, VC = 19.9 V), but in larger SMC (DO-214AB) package; 1000 W rating, AEC-Q101 qualified | Requires 2.5× more PCB area; higher RθJA (50 °C/W vs. 72 °C/W) demands larger copper pour for thermal relief | Choose when board layout allows SMC footprint and higher thermal mass improves long-pulse survivability beyond 10/1000 µs. |
Compared with SMBJ12AHE3/A and 1.5SMC12AH, SMB10J12AHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, 1000 W surge rating, and SMB footprint - making it the optimal choice for space-constrained, thermally demanding automotive modules where regulatory compliance and long-term field reliability are mandatory.
Availability
SMB10J12AHM3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, infotainment power supplies, and ADAS camera systems requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMB10J12AHM3/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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMB10J series is engineered specifically for automotive-grade transient suppression - balancing high surge capacity, tight parametric tolerances, and stringent environmental compliance to meet OEM requirements for under-hood and safety-critical electronics.
FAQ
What is the clamping voltage of SMB10J12AHM3/I at its rated peak pulse current?
The SMB10J12AHM3/I has a maximum clamping voltage (VC) of 19.9 V at 50.3 A peak pulse current (IPPM), measured with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range (-55 °C to +150 °C) and ensures downstream components remain within safe voltage limits during standardized automotive transients such as ISO 7637-2 Pulse 5a. The SMB10J12AHM3/I achieves this with low incremental surge resistance inherent to its glass-passivated junction structure.
Is SMB10J12AHM3/I suitable for bidirectional signal line protection?
No, SMB10J12AHM3/I is a unidirectional TVS diode and must not be used on bidirectional lines like CAN or LIN without external circuitry. Its cathode-band marking indicates polarity-sensitive installation - reverse connection blocks conduction in normal operation but fails to clamp positive transients on the protected line. For bidirectional protection, Vishay's SMB8J12CA (bidirectional variant, 12 V VWM, 19.9 V VC) is the functionally matched alternative. The SMB10J12AHM3/I is intended exclusively for DC power rail or unidirectional I/O protection.
Does SMB10J12AHM3/I require derating at elevated ambient temperatures?
Yes, SMB10J12AHM3/I requires derating above TA = 25 °C per Figure 2 in Vishay document 88422. At 85 °C ambient, its 1000 W peak pulse power rating drops to approximately 650 W, and at 125 °C, it falls to ~400 W. This derating stems from its 72 °C/W junction-to-ambient thermal resistance (RθJA) and must be applied when calculating worst-case surge survival in high-temperature locations such as near power converters or under-hood ECUs. The SMB10J12AHM3/I datasheet provides exact derating curves for both power and current.
How does the HM3 suffix affect the compliance status of SMB10J12AHM3/I?
The HM3 suffix on SMB10J12AHM3/I denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - satisfying Tier 1 automotive OEM requirements including GMW3172 and Ford WSS-M99P1111-A. Unlike E3-suffix variants, HM3 uses bromine- and chlorine-free molding compounds and matte tin plating meeting JESD201 Class 2 whisker resistance. This makes SMB10J12AHM3/I acceptable for safety-critical and environmentally regulated vehicle platforms where standard RoHS parts are insufficient.
Can SMB10J12AHM3/I replace SMBJ12A in an existing design without layout changes?
Yes, SMB10J12AHM3/I is pin-compatible with SMBJ12A in the SMB (DO-214AA) package and shares identical mechanical dimensions, pad layout, and polarity marking. However, SMB10J12AHM3/I offers higher PPPM (1000 W vs. 600 W), AEC-Q101 qualification, and halogen-free materials - meaning it can be dropped into legacy SMBJ12A footprints for enhanced surge robustness and automotive compliance without PCB revision. Thermal performance remains comparable due to identical package form factor and mounting recommendations.
SMB10J12AHM3/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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 50.3A
- Power - Peak Pulse:
- 1000W (1kW)
- 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)
SMB10J12AHM3/I FAQ
1.How can I place an order for SMB10J12AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB10J12AHM3/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 SMB10J12AHM3/I reliable?
The price and inventory of SMB10J12AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB10J12AHM3/I is usually 5 days.
3.What payment methods are accepted for SMB10J12AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB10J12AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB10J12AHM3/I?
SMB10J12AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB10J12AHM3/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 SMB10J12AHM3/I?
For technical support, including SMB10J12AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB10J12AHM3/I requirements.
6.How does Aetrix verify that SMB10J12AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB10J12AHM3/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 SMB10J12AHM3/I meets industry standards.
7.What is the process for return or replacement of SMB10J12AHM3/I?
All SMB10J12AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB10J12AHM3/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 SMB10J12AHM3/I part is unused and in its original packaging.
Return procedure for SMB10J12AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB10J12AHM3/I Tags
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