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Vishay General Semiconductor - Diodes Division SMBJ12AHM3_A/H
- Part No.:
- SMBJ12AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12AHM3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,565
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Product details
Overview
SMBJ12AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients up to 19.9 V at 30.2 A peak pulse current (10/1000 µs), with 600 W peak pulse power rating and 12 V stand-off voltage. It protects MOSFETs, ICs, and sensor signal lines in industrial power supplies and automotive control modules against inductive switching surges.
For engineers reviewing the SMBJ12AHM3_A/H datasheet, SMBJ12AHM3_A/H pinout, SMBJ12AHM3_A/H application, or SMBJ12AHM3_A/H equivalent, key selection criteria include clamping voltage (VC = 19.9 V), breakdown voltage range (13.3–14.7 V), unidirectional polarity, AEC-Q101 qualification status, and halogen-free RoHS-compliant construction.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (>1 MΩ leakage at 12 V), but triggers avalanche conduction when reverse voltage exceeds its 13.3–14.7 V breakdown range, clamping transient energy within nanoseconds. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance.
Thermal design relies on its RθJA of 100 °C/W and RθJL of 20 °C/W, with maximum junction temperature rated at +150 °C. The device is rated for repetitive 10/1000 µs pulses at 0.01% duty cycle and single 8.3 ms half-sine surge current up to 100 A (IFSM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 12 V - Maximum continuous reverse operating voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 13.3–14.7 V at 1 mA - Confirmed avalanche initiation range defining reliable turn-on threshold. |
| Clamping Voltage (VC) | 19.9 V at 30.2 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge. |
| Peak Pulse Power (PPPM) | 600 W - Sustained transient energy absorption capability per IEC 61000-4-5 standard waveform. |
| Maximum Leakage (ID) | 5.0 µA at 12 V - Ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Junction Temperature Range | −55 °C to +150 °C - Enables deployment in under-hood automotive and industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path to complete clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges without derating in standard PCB layouts. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage. |
| AEC-Q101 qualified (HM3 suffix) | Validates reliability for automotive body control modules, ADAS sensors, and infotainment power rails. |
| MSL Level 1 (260 °C reflow) | Supports lead-free assembly without preconditioning; compatible with standard SMT reflow profiles. |
| Halogen-free & RoHS-compliant | Fulfills environmental compliance for EU, China RoHS, and automotive OEM material declarations. |
Applications
| Automotive Body Control Module | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Protecting 12 V CAN bus transceivers and microcontroller I/O pins from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤19.9 V during 100 V/50 ms load dump events, preserving ISO 11898-2 compliance. |
Use Scenario: Safeguarding 24 V digital input channels from relay coil flyback and ESD in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side signal conditioning front-end. Use Value: Absorbs 600 W surge energy while maintaining <5 µA leakage at 24 V nominal, ensuring clean logic thresholds. |
| Consumer Appliance Motor Drive | Telecom Power Supply Input |
|
Use Scenario: Suppressing inductive kickback from brushed DC motor drivers in smart home HVAC systems. IC Role / Device Role / Timing Role: Fast-response parallel clamp across H-bridge low-side FET source-to-ground path. Use Value: Clamps 30.2 A surge within <1 ns, preventing drain-source breakdown of 40 V MOSFETs. |
Use Scenario: Front-end protection of AC/DC adapter inputs against lightning-induced surges in VoIP gateways. IC Role / Device Role / Timing Role: Secondary-level TVS after MOV, providing precise clamping for downstream rectifier and controller ICs. Use Value: Delivers 19.9 V clamping at 30.2 A-lower than generic 22 V alternatives-reducing stress on 24 V-rated secondary-side components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12AHE3_A/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial-grade industrial controls where automotive reliability is not required. | Select when cost sensitivity outweighs halogen-free or automotive qualification needs. |
| SMBJ12CAHM3_A/H | Bidirectional variant with same VWM (12 V), symmetric clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, audio interfaces) where polarity reversal occurs. | Choose only if bidirectional protection is explicitly needed; unidirectional SMBJ12AHM3_A/H offers lower capacitance and tighter VC. |
Compared with SMBJ12AHE3_A/H, SMBJ12AHM3_A/H adds halogen-free construction and AEC-Q101 validation without changing electrical specs; versus SMBJ12CAHM3_A/H, it provides optimized unidirectional clamping with lower leakage and higher surge margin for DC-biased rails.
Availability
SMBJ12AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and telecom power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ12AHM3_A/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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and optoelectronics, with emphasis on high-reliability, automotive-qualified, and industry-standard components.
SMBJ12AHM3_A/H belongs to the TRANSZORB® TVS family, engineered specifically for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 validation and precise clamping performance.
FAQ
What is the clamping voltage of SMBJ12AHM3_A/H at its rated peak pulse current?
The SMBJ12AHM3_A/H has a maximum clamping voltage (VC) of 19.9 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 30.2 A. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ12AHM3_A/H maintains this clamping performance across its qualified operating temperature range.
Is SMBJ12AHM3_A/H qualified for automotive applications?
Yes, SMBJ12AHM3_A/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay's official documentation. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD robustness-making SMBJ12AHM3_A/H suitable for under-hood and cabin electronics such as body control modules and sensor interfaces.
What does the "HM3" suffix indicate in SMBJ12AHM3_A/H?
The "HM3" suffix in SMBJ12AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, but not halogen-free). The "_A/H" further specifies packaging: 7″ tape-and-reel, 750 units per reel, with revision code A and humidity level H.
How does SMBJ12AHM3_A/H differ from SMBJ12AHE3_A/H?
SMBJ12AHM3_A/H and SMBJ12AHE3_A/H share identical electrical specifications-including VWM (12 V), VBR (13.3–14.7 V), and VC (19.9 V)-but differ in material compliance: HM3 is halogen-free and AEC-Q101 qualified, whereas HE3 is RoHS-compliant and AEC-Q101 qualified but contains halogens. Both use the same SMB (DO-214AA) package and mounting footprint.
Can SMBJ12AHM3_A/H be used in bidirectional signal protection?
No-SMBJ12AHM3_A/H is a unidirectional TVS diode, intended for DC-biased lines where polarity is fixed (e.g., 12 V power rails, microcontroller I/O referenced to ground). For bidirectional protection (e.g., RS-485, USB D+/D−), the SMBJ12CAHM3_A/H variant must be used, as it features symmetrical breakdown in both directions and no cathode marking.
SMBJ12AHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 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)
SMBJ12AHM3_A/H FAQ
1.How can I place an order for SMBJ12AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12AHM3_A/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 SMBJ12AHM3_A/H reliable?
The price and inventory of SMBJ12AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ12AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12AHM3_A/H?
SMBJ12AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12AHM3_A/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 SMBJ12AHM3_A/H?
For technical support, including SMBJ12AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12AHM3_A/H requirements.
6.How does Aetrix verify that SMBJ12AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ12AHM3_A/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 SMBJ12AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ12AHM3_A/H?
All SMBJ12AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12AHM3_A/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 SMBJ12AHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ12AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12AHM3_A/H Tags
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