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Vishay General Semiconductor - Diodes Division SMBJ12AHE3_A/I
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- Part No.:
- SMBJ12AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12AHE3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,124
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Product details
Overview
SMBJ12AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V maximum clamping voltage (VC) at 30.2 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMBJ12AHE3_A/I datasheet, SMBJ12AHE3_A/I pinout, SMBJ12AHE3_A/I application, or SMBJ12AHE3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and real-world use context for surge immunity design in 12 V rail systems.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp with glass-passivated junction, optimized for low incremental surge resistance and sub-nanosecond response time. Its 19.9 V clamping voltage at 30.2 A ensures robust overvoltage protection while limiting stress on downstream 12 V-rated components.
Designed for surface-mount assembly on 0.2" × 0.2" copper pads, it meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), supports 100 A IFSM (8.3 ms half-sine), and exhibits 0.083 %/°C VBR temperature coefficient - enabling stable performance across −55 to +150 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse voltage before leakage exceeds 5 µA; sets operating margin for 12 V DC rails. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal operating voltage. |
| VC (Clamping Voltage) | 19.9 V at IPPM = 30.2 A - Peak voltage seen by protected circuit during 600 W transient; limits stress on 20 V-tolerant ICs. |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs) - Sustains high-energy surges without failure; validated per ANSI/IEEE C62.35. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive and industrial environments with elevated ambient temperatures. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard PCB pad layout; informs derating above 25 °C. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, cathode indicated by band. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode | Avalanche clamping terminal | Banded end; connected to protected line (e.g., 12 V supply or signal trace) to shunt transients to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation when properly mounted. |
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics requiring zero-failure field reliability. |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes overvoltage overshoot during transients - critical for protecting 12 V logic and gate drivers. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume automated assembly. |
| Glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V CAN bus power lines and microcontroller I/O against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 12 V supply rail and ground, triggered within <1 ns to limit voltage to ≤20 V. Use Value: Prevents latch-up or permanent damage to 12 V-tolerant MCUs and CAN transceivers during 12 V system transients. |
Use Scenario: Shielding 24 V digital input channels from inductive kickback when switching solenoids or relays. IC Role / Device Role / Timing Role: Standoff-clamp device installed at connector entry point, conducting only during >12 V transients. Use Value: Eliminates need for external series resistors or RC snubbers while maintaining signal integrity for 1 kHz polling rates. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Input Stage |
Use Scenario: Safeguarding gate drivers and bootstrap circuits in BLDC motor inverters subjected to back-EMF spikes. IC Role / Device Role / Timing Role: Fast-response clamp on 12 V auxiliary supply feeding high-side gate drivers. Use Value: Maintains driver functionality during 100 ns–1 µs spikes up to 30 A, avoiding false shutdowns or shoot-through. |
Use Scenario: Front-end protection of AC/DC adapter inputs against lightning-induced surges on telecom site power feeds. IC Role / Device Role / Timing Role: Primary-level unidirectional suppressor on DC output rail prior to DC-DC converter stage. Use Value: Limits transient energy entering downstream converters, reducing need for oversized input capacitors and thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12AHM3_A/I | 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 public infrastructure projects). | Choose SMBJ12AHM3_A/I when halogen-free bill-of-materials is required; otherwise SMBJ12AHE3_A/I is preferred for general commercial/automotive use. |
| SMCJ12AHE3_A/I | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package with higher RθJA (50 °C/W) and 1500 W PPPM rating. | Used where higher surge energy handling (>600 W) or improved thermal dissipation is needed, e.g., in high-power industrial SMPS front ends. | Select SMCJ12AHE3_A/I only if system-level surge testing exceeds 600 W or board layout allows larger footprint; SMBJ12AHE3_A/I remains optimal for space-constrained 12 V rail protection. |
Compared with SMBJ12AHM3_A/I, SMBJ12AHE3_A/I offers identical protection performance with standard RoHS compliance; versus SMCJ12AHE3_A/I, it trades surge capacity for compact SMB footprint - making SMBJ12AHE3_A/I the preferred choice for cost-sensitive, space-limited 12 V protection where 600 W rating suffices.
Availability
SMBJ12AHE3_A/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input modules, and consumer appliance motor control systems requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMBJ12AHE3_A/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, precision, and application-specific validation.
The SMBJ series was engineered for high-reliability transient suppression in automotive and industrial environments, delivering consistent clamping performance across wide temperature ranges and stringent surge standards.
FAQ
What is the maximum clamping voltage of SMBJ12AHE3_A/I at its rated peak pulse current?
The SMBJ12AHE3_A/I has a maximum clamping voltage (VC) of 19.9 V at its specified peak pulse current (IPPM) of 30.2 A under the 10/1000 µs waveform condition. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for 12 V systems. The SMBJ12AHE3_A/I maintains this clamping performance across its full operating temperature range of −55 to +150 °C.
Is SMBJ12AHE3_A/I qualified for automotive applications?
Yes, SMBJ12AHE3_A/I is AEC-Q101 qualified, meaning it has passed accelerated stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22 standards. This qualification confirms its suitability for automotive body electronics, infotainment power supplies, and other non-safety-critical vehicle subsystems. The "HE3" suffix explicitly denotes AEC-Q101 compliance in Vishay's ordering nomenclature.
How does the SMBJ12AHE3_A/I differ from bidirectional variants like SMBJ12CA?
The SMBJ12AHE3_A/I is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where reverse conduction is not required. In contrast, SMBJ12CA is bidirectional, offering symmetrical clamping for AC or floating signal lines. Electrical differences include higher ID leakage tolerance for low-VWM bidirectional types and absence of forward voltage (VF) spec in bidirectional parts. SMBJ12AHE3_A/I provides VF ≤ 3.5 V at 50 A forward current - a parameter irrelevant to SMBJ12CA.
What is the thermal resistance and how does it affect SMBJ12AHE3_A/I layout?
The SMBJ12AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" copper pads per terminal. This value directly impacts power derating: at 75 °C ambient, its 5.0 W steady-state power dissipation must be reduced to ~2.5 W. Layout best practices include maximizing copper area and using internal ground planes to lower effective RθJA and sustain repetitive surge duty cycles.
Can SMBJ12AHE3_A/I be used in place of SMAJ12A in an existing design?
No - SMBJ12AHE3_A/I and SMAJ12A are not interchangeable without layout review. While both are 12 V unidirectional TVS diodes, SMAJ12A uses the smaller SMA (DO-214AC) package (2.92 mm × 1.91 mm), whereas SMBJ12AHE3_A/I uses SMB (DO-214AA) (4.57 mm × 3.94 mm). The larger SMB footprint provides higher surge capability (600 W vs. 400 W) but requires PCB pad revision. Substitution may compromise surge margin or cause solder joint stress if forced into SMA land patterns.
SMBJ12AHE3_A/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:
- 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/I FAQ
1.How can I place an order for SMBJ12AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12AHE3_A/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 SMBJ12AHE3_A/I reliable?
The price and inventory of SMBJ12AHE3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMBJ12AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12AHE3_A/I?
SMBJ12AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12AHE3_A/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 SMBJ12AHE3_A/I?
For technical support, including SMBJ12AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12AHE3_A/I requirements.
6.How does Aetrix verify that SMBJ12AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ12AHE3_A/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 SMBJ12AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ12AHE3_A/I?
All SMBJ12AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12AHE3_A/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 SMBJ12AHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ12AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12AHE3_A/I Tags
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