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Vishay General Semiconductor - Diodes Division SMBJ12-E3/52
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- Part No.:
- SMBJ12-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12-E3/52.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,871
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Product details
Overview
SMBJ12-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 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), used in automotive electronics, industrial sensor interfaces, and DC power rail protection.
For engineers reviewing the SMBJ12-E3/52 datasheet, SMBJ12-E3/52 pinout, SMBJ12-E3/52 application, or SMBJ12-E3/52 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant commercial-grade construction, and direct replacement guidance for circuit-level ESD and lightning transient protection design.
Technical Context
The SMBJ12-E3/52 operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast response (<1 ns) to transient overvoltages while maintaining low incremental surge resistance. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Rated for -55 °C to +150 °C operating junction temperature, it delivers 5.0 W steady-state power dissipation on infinite heatsink at 50 °C ambient and exhibits 100 °C/W typical junction-to-ambient thermal resistance when mounted on 0.2" × 0.2" copper pads - critical for thermal management in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 12 V DC systems. |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 19.9 V at 30.2 A - Clamping voltage limits downstream IC/MOSFET stress during 10/1000 µs surge; enables robust 12 V rail protection. |
| PPPM | 600 W - Peak pulse power handling capability per 10/1000 µs waveform supports IEC 61000-4-5 Level 4 surge immunity compliance. |
| ID @ VWM | 5.0 µA max - Low reverse leakage preserves system efficiency and battery life in always-on applications. |
| TJ max | +150 °C - Enables operation in under-hood automotive or high-temperature industrial environments without derating. |
| Package | SMB (DO-214AA) - Surface-mount footprint with 0.205" × 0.130" body size; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), 260 °C peak reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point | Connected to protected line (e.g., 12 V rail); clamps positive transients to ground when reverse-biased. |
| Anode (non-banded end) | Cathode-side connection point | Typically tied to system ground or low-impedance return path; completes clamping loop during surge event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports high-energy surge suppression without degradation across >1000 cycles at 0.01% duty cycle. |
| 19.9 V clamping voltage at 30.2 A | Keeps protected 12 V logic or power circuits below absolute maximum ratings during IEC 61000-4-5 surges. |
| Glass passivated junction | Ensures stable VBR over time and temperature, minimizing parameter drift in automotive and industrial deployments. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental regulations; suitable for consumer, industrial, and telecom equipment without halogen restrictions. |
| Low profile SMB package | Enables placement near connectors or ICs for shortest possible transient path - critical for ESD and fast-rising surge mitigation. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply lines feeding microcontrollers and CAN transceivers in door modules and lighting controllers against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused 12 V rail and local ground plane to clamp transients before reaching sensitive ICs. Use Value: Limits clamped voltage to 19.9 V, ensuring downstream components rated for 24 V absolute maximum survive repeated 12 V system surges. |
Use Scenario: Safeguarding 24 V digital input channels of programmable logic controllers against field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS connected in parallel with optocoupler input to absorb energy before isolation barrier. Use Value: 30.2 A peak surge current capacity handles 1 A inductive kickback events without failure, extending maintenance intervals. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Drive Board |
|
Use Scenario: Secondary-side transient suppression on 12 V bias rails powering Ethernet PHYs and PoE controllers in network switches. IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to connector entry point to shunt ESD and lightning-induced surges. Use Value: Sub-1 ns response time prevents voltage overshoot from propagating into communication ICs, reducing packet error rates. |
Use Scenario: DC bus protection on brushed motor driver boards in washing machines and HVAC blowers exposed to commutation spikes. IC Role / Device Role / Timing Role: Unidirectional suppressor installed across H-bridge supply inputs to clamp inductive switching spikes. Use Value: 600 W pulse rating absorbs repetitive 100 µs–1 ms spikes from motor brushes, preventing MOSFET avalanche failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A-E3/52 | Same electrical specs and package; differs only in marking code (SMBJ12A vs SMBJ12-E3/52 denotes identical device with alternate ordering suffix). | No functional difference; both meet same Vishay specification 88392 and RoHS requirements. | Select SMBJ12A-E3/52 if legacy BOM references "A" suffix; SMBJ12-E3/52 is preferred for new designs per current Vishay preferred P/N format. |
| SMCJ12A-E3/52 | Same VWM/VBR/VC but in larger SMC (DO-214AB) package; 1500 W PPPM rating (2.5× higher), 50.0 A IPPM, 20% larger footprint. | Better suited for higher-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger package. | Choose SMCJ12A-E3/52 only when 1500 W surge margin is required; SMBJ12-E3/52 remains optimal for space-constrained 600 W applications. |
Compared with SMBJ12A-E3/52 (identical function, alternate marking), and SMCJ12A-E3/52 (higher-power SMC variant), SMBJ12-E3/52 delivers the optimal balance of 600 W surge capability, SMB footprint compatibility, and commercial-grade reliability for cost-sensitive 12 V system protection.
Availability
SMBJ12-E3/52 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, telecom power supplies, and consumer appliance motor control requiring stable component supply and full traceability.
Supply support for SMBJ12-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, thermal performance, and AEC-Q qualification.
The SMBJ series is engineered for robust transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping behavior and long-life surge endurance in harsh environments.
FAQ
What is the maximum clamping voltage of SMBJ12-E3/52 under surge conditions?
The SMBJ12-E3/52 has a maximum clamping voltage (VC) of 19.9 V at 30.2 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay document 88392, ensuring predictable overvoltage limiting for 12 V systems protected by SMBJ12-E3/52.
Is SMBJ12-E3/52 suitable for automotive applications?
SMBJ12-E3/52 is RoHS-compliant commercial-grade and not AEC-Q101 qualified; for automotive use, select the HE3-suffixed variant (e.g., SMBJ12HE3). The SMBJ12-E3/52 remains appropriate for non-safety-critical automotive subsystems like infotainment power rails where full qualification is not mandated, provided system-level validation confirms robustness.
What does the "-E3/52" suffix indicate in SMBJ12-E3/52?
The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "/52" specifies packaging in 7" diameter plastic tape and reel with 750 units per reel. This ordering code aligns with Vishay's standardized nomenclature in document 88392 and ensures correct material and logistics handling for SMBJ12-E3/52.
How does SMBJ12-E3/52 compare to bidirectional TVS diodes like SMBJ12CA?
SMBJ12-E3/52 is unidirectional and intended for DC line protection with defined polarity; SMBJ12CA is bidirectional and used for AC or differential signal lines. They share identical VWM (12 V) and VC (19.9 V), but SMBJ12-E3/52 conducts forward current up to 100 A (IFSM), whereas SMBJ12CA does not specify IFSM due to symmetrical structure - a key distinction when selecting SMBJ12-E3/52 for polarized rails.
What is the thermal resistance of SMBJ12-E3/52, and how does it affect layout?
SMBJ12-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain TJ ≤ 150 °C under 5.0 W steady-state dissipation, designers must ensure adequate copper area and avoid excessive ambient temperature - confirming thermal performance is essential before finalizing PCB layout for SMBJ12-E3/52.
SMBJ12-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 27.3A
- 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)
SMBJ12-E3/52 FAQ
1.How can I place an order for SMBJ12-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12-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 SMBJ12-E3/52 reliable?
The price and inventory of SMBJ12-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 SMBJ12-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ12-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12-E3/52?
SMBJ12-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12-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 SMBJ12-E3/52?
For technical support, including SMBJ12-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12-E3/52 requirements.
6.How does Aetrix verify that SMBJ12-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ12-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 SMBJ12-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ12-E3/52?
All SMBJ12-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12-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 SMBJ12-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ12-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12-E3/52 Tags
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