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Vishay General Semiconductor - Diodes Division SMBJ12A-E3/52
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- Part No.:
- SMBJ12A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12A-E3/52.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:18,095
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Product details
Overview
SMBJ12A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 12 V standoff voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1.0 mA, and clamps transients to ≤19.9 V at 30.2 A peak pulse current (IPPM) under 10/1000 µs waveform - deployed in power supply rails, I/O lines, and MOSFET gate drivers in industrial motor controls.
For engineers reviewing the SMBJ12A-E3/52 datasheet, SMBJ12A-E3/52 pinout, SMBJ12A-E3/52 application, or SMBJ12A-E3/52 equivalent, key selection criteria include its 600 W peak pulse power rating, low 0.083 %/°C VBR temperature coefficient, RoHS-compliant matte tin-plated SMB (DO-214AA) package, and AEC-Q101 qualification readiness via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device in unidirectional configuration, with cathode-band polarity marking and glass-passivated junction for stable surge response. Its 100 °C/W junction-to-ambient thermal resistance and 20 °C/W junction-to-lead resistance support reliable operation up to 150 °C junction temperature under pulsed stress.
The SMBJ12A-E3/52 delivers fast sub-nanosecond response to ESD and lightning-induced transients, with low incremental surge resistance ensuring minimal voltage overshoot during 10/1000 µs surges. It meets UL 497B recognition (QVGQ2) and J-STD-020 MSL Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V at 1.0 mA - precise breakdown threshold ensures predictable turn-on margin above VWM |
| VC @ IPPM | ≤19.9 V at 30.2 A - clamping voltage defines worst-case protected-circuit stress during 10/1000 µs surge |
| PPPM | 600 W - peak pulse power handling capability per single 10/1000 µs transient event |
| IPPM | 30.2 A - maximum non-repetitive surge current supported without degradation |
| TJ max | +150 °C - enables use in high-temperature industrial and automotive under-hood environments |
| Package | SMB (DO-214AA) - standardized 2-pin surface-mount outline with 0.205" × 0.130" footprint and 0.086" height |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference | Provides return path during clamping; must be routed with low-inductance trace to minimize voltage overshoot |
| Cathode | Current exit terminal in forward bias; marked with band; connected to protected line | Defines clamping polarity - reverse-biased during normal operation, conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V DC rails without derating |
| Low 0.083 %/°C VBR tempco | Ensures stable clamping threshold across -55 °C to +150 °C ambient, critical for automotive and outdoor equipment |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without pre-baking or special handling |
| UL 497B recognized (QVGQ2) | Validates suitability for telecom and industrial signal-line protection per safety standards |
| RoHS-compliant, halogen-free option available | Meets environmental compliance for global OEM programs including automotive Tier 1 supply chains |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 12 V power inputs and CAN/LIN bus lines against load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground to clamp load-dump spikes up to 35 V. Use Value: Limits voltage seen by downstream PMICs and microcontrollers to ≤19.9 V, preventing latch-up or permanent damage. |
Use Scenario: Input protection for door module MCUs and sensor interfaces exposed to battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail, conducting only during >13.3 V transients. Use Value: Survives 100 A surge (8.3 ms half-sine) per AEC-Q101 test plan when used with appropriate PCB copper area. |
| Industrial PLC I/O Modules | Consumer Power Adapters |
|
Use Scenario: Protection of digital input channels (24 V nominal) against field-wiring induced transients and ESD. IC Role / Device Role / Timing Role: Clamping device on optocoupler input side, shunting surge energy to common ground. Use Value: Maintains <1 µA leakage at 12 V, preserving signal integrity while enabling <1 ns response to 8 kV ESD events. |
Use Scenario: Secondary-side output protection in 12 V wall adapters against output short-circuit recovery spikes. IC Role / Device Role / Timing Role: Fast-reacting TVS across DC output terminals to suppress flyback voltage from transformer leakage inductance. Use Value: Clamps 30.2 A surge within 19.9 V, preventing overvoltage damage to USB-PD controllers and load switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-E3/52 | Bidirectional variant with same VWM (12 V), symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal is possible | Select SMBJ12CA-E3/52 only if bidirectional protection is needed; SMBJ12A-E3/52 is optimal for DC rails with defined polarity |
| SMAJ12A-E3/52 | Lower 400 W PPPM, smaller SMA (DO-214AC) package, higher RθJA (140 °C/W) | Suitable for space-constrained consumer designs with lower surge immunity requirements | Choose SMAJ12A-E3/52 only when board area is critical and 400 W surge rating suffices; SMBJ12A-E3/52 provides 50 % higher power margin |
Compared with SMBJ12CA-E3/52 and SMAJ12A-E3/52, the SMBJ12A-E3/52 offers superior unidirectional surge handling (600 W vs. 400 W) and lower thermal resistance (100 °C/W vs. 140 °C/W), making it preferred for industrial 12 V DC power rail protection where reliability under repeated transients is essential.
Availability
SMBJ12A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and PLC I/O modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ12A-E3/52 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 and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness against load dump, ESD, and lightning surges is mandatory.
FAQ
What is the maximum clamping voltage of SMBJ12A-E3/52 at its rated peak pulse current?
The SMBJ12A-E3/52 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 guaranteed per Vishay's datasheet (Document Number: 88392, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. Designers use this parameter to verify that downstream components remain within their absolute maximum ratings.
Is SMBJ12A-E3/52 suitable for automotive applications requiring AEC-Q101 qualification?
The SMBJ12A-E3/52 itself is RoHS-compliant commercial-grade; however, Vishay offers AEC-Q101 qualified versions under the HE3 and HM3 suffixes (e.g., SMBJ12AHE3_B). The SMBJ12A-E3/52 shares identical electrical and mechanical specifications with those qualified variants - only the test documentation and traceability differ. For production automotive use, specify the HE3 version; SMBJ12A-E3/52 is appropriate for prototyping and non-automotive industrial designs.
How does the SMBJ12A-E3/52 differ from the SMBJ12CA-E3/52?
The SMBJ12A-E3/52 is unidirectional, with a cathode band indicating polarity and clamping only during reverse overvoltage; the SMBJ12CA-E3/52 is bidirectional, offering symmetrical clamping for AC signals or polarity-agnostic protection. Both share identical VWM (12 V), VBR, and PPPM (600 W), but the CA variant lacks polarity marking and supports dual-direction surge suppression. Use SMBJ12A-E3/52 for DC power rails; choose SMBJ12CA-E3/52 for data lines like RS-485 or Ethernet PHY interfaces.
What is the thermal resistance of SMBJ12A-E3/52, and how does it affect layout design?
The SMBJ12A-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet. To maintain safe junction temperatures under repetitive surges, designers must provide adequate copper area and avoid thermal bottlenecks - reducing pad size increases RθJA, risking thermal runaway during sustained transient activity. The SMBJ12A-E3/52's RθJL of 20 °C/W further emphasizes the importance of short, wide traces to internal ground planes.
Does SMBJ12A-E3/52 meet any safety certifications for end-equipment compliance?
Yes - the SMBJ12A-E3/52 carries Underwriters Laboratories (UL) recognition under file number E136766 for both unidirectional and bidirectional devices, compliant with UL 497B for telecommunications protectors. This certification validates its use in safety-critical signal and power line protection across industrial and telecom equipment. The device also meets IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) immunity test levels when applied per recommended layout guidelines in Vishay's application notes.
SMBJ12A-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ12A-E3/52 FAQ
1.How can I place an order for SMBJ12A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12A-E3/52 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 SMBJ12A-E3/52 reliable?
The price and inventory of SMBJ12A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ12A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12A-E3/52?
SMBJ12A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12A-E3/52 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 SMBJ12A-E3/52?
For technical support, including SMBJ12A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12A-E3/52 requirements.
6.How does Aetrix verify that SMBJ12A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ12A-E3/52 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 SMBJ12A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ12A-E3/52?
All SMBJ12A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12A-E3/52, 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 SMBJ12A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ12A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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