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Vishay General Semiconductor - Diodes Division SMBJ12AHE3_A/H
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- Part No.:
- SMBJ12AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12AHE3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ12AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 12 V standoff voltage (VWM), 13.3–14.7 V breakdown range at 1 mA, 19.9 V clamping voltage at 30.2 A peak pulse current (10/1000 µs), and 600 W peak pulse power capability - deployed in automotive ECUs, industrial I/O modules, and sensor interface circuits.
For engineers reviewing the SMBJ12AHE3_A/H datasheet, SMBJ12AHE3_A/H pinout, SMBJ12AHE3_A/H application, or SMBJ12AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, SMB (DO-214AA) package compatibility with automated SMT assembly, low clamping ratio (VC/VBR ≈ 1.45), and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation, it remains high-impedance until transient voltage exceeds VBR, then avalanches to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Designed for 10/1000 µs waveform compliance per ANSI/IEEE C62.35, SMBJ12AHE3_A/H delivers 30.2 A peak pulse current with ≤19.9 V clamping, maintaining <5 µA leakage at 12 V and supporting operating junction temperatures from –55 °C to +150 °C - validated for automotive-grade deployment via AEC-Q101 qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - precise avalanche initiation range ensuring predictable turn-on during transients |
| VC (Clamping Voltage) | 19.9 V at 30.2 A (10/1000 µs) - limits downstream voltage stress to protect 20 V-rated ICs and MOSFETs |
| PPPM (Peak Pulse Power) | 600 W - sustains high-energy surges (e.g., ISO 7637-2 Pulse 1/2a/5a) without failure under defined test conditions |
| IPPM (Peak Pulse Current) | 30.2 A - quantifies surge-handling capacity for inductive switch-off or ESD-like events on 12 V systems |
| RθJA (Thermal Resistance) | 100 °C/W - requires minimum 0.2" × 0.2" copper pads per terminal to maintain TJ ≤ 150 °C at full power |
| AEC-Q101 Qualified | Yes - certified for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band (unidirectional only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail; completes clamping path during reverse transient |
| Cathode | Reverse-biased input terminal | Connected to protected line (e.g., 12 V supply or CAN_H); avalanche conduction initiates here during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against high-energy load dump and inductive switching transients in 12 V automotive systems |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive use with extended temperature cycling, humidity, and mechanical shock compliance |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping, reducing stress on downstream 16 V tolerant components |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow at 260 °C peak, compatible with standard lead-free SMT processes |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<5 µA at VWM) over lifetime and temperature |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between VIN and GND, responding within <1 ns to limit transient voltage. Use Value: Clamps to ≤19.9 V at 30.2 A, preventing damage to 20 V max-rated LDOs and MCU VDD pins while meeting AEC-Q101 requirements. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA transmitter outputs) in PLC I/O modules from field wiring surges and ESD. IC Role / Device Role / Timing Role: Reverse-biased TVS connected across signal and return, conducting only during overvoltage events on the loop. Use Value: Maintains <5 µA leakage at 12 V standby, preserving loop accuracy; clamps fast transients without affecting 4–20 mA line regulation. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
|
Use Scenario: Shielding 12 V DC input of PoE-powered network switches from induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC input rail, coordinated with upstream fuse and downstream filtering. Use Value: Absorbs 600 W pulses without degradation, enabling compliance with IEC 61000-4-5 Level 3 (1 kV/2 Ω) when combined with proper PCB layout. |
Use Scenario: Adding secondary surge protection on 5 V USB VBUS lines in smart home hubs exposed to AC adapter transients. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary protection, providing low-leakage backup clamping at 12 V system level. Use Value: Delivers 19.9 V clamping at 30.2 A while adding negligible capacitance (<100 pF), avoiding USB 2.0 signal integrity issues. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12AHM3_A/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU automotive Tier 1 specs) | Direct substitution if halogen-free requirement applies; same footprint, thermal, and electrical behavior |
| SMBJ12A-E3/52 | Commercial-grade (non-AEC-Q101), same SMB package and core electrical parameters but no automotive qualification | Approved for industrial/commercial use only; not validated for automotive temperature cycling or lifetime reliability testing | Cost-optimized alternative for non-automotive applications where AEC-Q101 is not required |
Compared with SMBJ12AHE3_A/H, the HM3 variant adds halogen-free compliance without performance trade-offs, while the E3/52 version omits AEC-Q101 validation - making HE3 the sole choice for automotive designs requiring full qualification traceability and extended reliability assurance.
Availability
SMBJ12AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power input stages requiring stable component supply with AEC-Q101 traceability and consistent surge performance.
Supply support for SMBJ12AHE3_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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure - engineered for fast response, stable clamping, and robust surge endurance in harsh environments.
FAQ
What is the clamping voltage of SMBJ12AHE3_A/H at its rated peak pulse current?
The SMBJ12AHE3_A/H has a maximum clamping voltage (VC) of 19.9 V at 30.2 A peak pulse current using the standardized 10/1000 µs waveform. This value is measured under specified test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ12AHE3_A/H maintains this clamping performance consistently due to its glass-passivated junction and AEC-Q101-validated construction.
Is SMBJ12AHE3_A/H suitable for automotive applications?
Yes, SMBJ12AHE3_A/H is explicitly AEC-Q101 qualified, as confirmed by its HE3 suffix and documentation in Vishay's 88392 datasheet. It meets automotive requirements for temperature cycling, humidity resistance, mechanical shock, and long-term reliability - making it appropriate for engine control modules, body control units, and ADAS sensor power rails. The SMBJ12AHE3_A/H is not a commercial-grade part; its qualification is integral to its design and manufacturing process.
What does the "HE3" suffix indicate in SMBJ12AHE3_A/H?
The "HE3" suffix in SMBJ12AHE3_A/H denotes a RoHS-compliant, AEC-Q101-qualified version with matte tin-plated leads. "H" identifies the AEC-Q101 qualification, "E3" confirms RoHS compliance and commercial-grade base material, and the trailing "_A/H" specifies packaging configuration (7" tape-and-reel, 750 units). This distinguishes SMBJ12AHE3_A/H from non-automotive variants like SMBJ12A-E3/52 and halogen-free alternatives such as SMBJ12AHM3_A/H.
How does SMBJ12AHE3_A/H compare to bidirectional TVS diodes like SMBJ12CA?
SMBJ12AHE3_A/H is unidirectional and intended for DC line protection where polarity is fixed (e.g., 12 V supply to GND), whereas SMBJ12CA is bidirectional and used in AC-coupled or polarity-agnostic paths (e.g., data lines). The SMBJ12AHE3_A/H exhibits forward voltage drop (~3.5 V at 50 A) and cathode marking, while SMBJ12CA has symmetrical breakdown in both directions and no polarity marking. Their clamping voltages and surge ratings differ slightly due to structural asymmetry - SMBJ12AHE3_A/H is not interchangeable with SMBJ12CA without circuit review.
What PCB layout guidance applies to SMBJ12AHE3_A/H for optimal thermal and electrical performance?
For optimal performance, SMBJ12AHE3_A/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the specified RθJA of 100 °C/W. Traces to the device should be short and wide to minimize inductance, especially on the cathode side, and avoid thermal relief on pads to maximize heat dissipation. The SMBJ12AHE3_A/H datasheet specifies this pad layout in Figure 1 and notes that derating is required above TA = 25 °C per Figure 2 - critical for under-hood automotive deployments.
SMBJ12AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ12AHE3_A/H FAQ
1.How can I place an order for SMBJ12AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12AHE3_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 SMBJ12AHE3_A/H reliable?
The price and inventory of SMBJ12AHE3_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 SMBJ12AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ12AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12AHE3_A/H?
SMBJ12AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12AHE3_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 SMBJ12AHE3_A/H?
For technical support, including SMBJ12AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12AHE3_A/H requirements.
6.How does Aetrix verify that SMBJ12AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ12AHE3_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 SMBJ12AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ12AHE3_A/H?
All SMBJ12AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12AHE3_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 SMBJ12AHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ12AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12AHE3_A/H Tags
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