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Vishay General Semiconductor - Diodes Division SMBJ12A-M3/52
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- Part No.:
- SMBJ12A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12A-M3/52.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,468
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Product details
Overview
SMBJ12A-M3/52 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 rating with 10/1000 µs waveform - deployed in industrial sensor protection and DC power rail surge suppression.
For engineers reviewing the SMBJ12A-M3/52 datasheet, SMBJ12A-M3/52 pinout, SMBJ12A-M3/52 application, or SMBJ12A-M3/52 equivalent, key selection criteria include unidirectional polarity, 19.9 V clamping performance under 30.2 A surge, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification eligibility (via HM3 suffix), and halogen-free RoHS compliance per M3 suffix.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<5 µA at VWM), while the low incremental surge resistance enables rapid energy dissipation during transient events.
The SMBJ12A-M3/52 is rated for -55 °C to +150 °C operating junction temperature, supports 100 A non-repetitive forward surge (IFSM), and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. Its 100 °C/W junction-to-ambient thermal resistance requires appropriate PCB copper pad area (0.2" × 0.2") for full 600 W pulse rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold. |
| 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 IC/MOSFET during 10/1000 µs transient; critical for downstream component survivability. |
| PPPM (Peak Pulse Power) | 600 W - Sustained for single 10/1000 µs surge; validates robustness against lightning-induced or inductive-switching transients. |
| ID (Reverse Leakage) | ≤5.0 µA at 12 V - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| TJ max. | +150 °C - Enables use in under-hood automotive or enclosed industrial environments without derating. |
| RθJA | 100 °C/W - Requires minimum 5.0 mm × 5.0 mm copper pad per terminal to maintain full power rating at TA = 25 °C. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-side reference; completes clamping loop during reverse surge. |
| Cathode | Avalanche conduction terminal | Connected to protected line (e.g., 12 V rail); conducts when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated clamping capability for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 12 V systems. |
| 19.9 V clamping at 30.2 A | Ensures protected 12 V logic or MOSFET gate drivers remain below absolute maximum ratings during surge. |
| Glass-passivated junction | Provides stable VBR over temperature and lifetime, minimizing parameter drift in harsh environments. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow assembly without pre-baking or special handling. |
| Halogen-free & RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements for green electronics manufacturing. |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: 12 V supply line feeding analog sensor front-ends in factory automation PLCs exposed to relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V input and ground to clamp inductive kickback transients. Use Value: Limits voltage excursion to ≤19.9 V, preventing damage to precision op-amps and ADC references rated for 20 V absolute max. |
Use Scenario: 12 V battery-fed power rail in BCM controlling door locks, lighting, and HVAC actuators. IC Role / Device Role / Timing Role: Primary surge suppressor on main power input, upstream of LDOs and microcontrollers. Use Value: Withstands load-dump pulses up to ISO 7637-2 Pulse 5a (35 V, 100 ms) via clamping action and thermal mass of PCB pads. |
| DC-DC Converter Input Stage | Telecom Power Supply EMI Filter Output |
Use Scenario: Input stage of 12 V → 3.3 V buck converter powering FPGA I/O banks in edge computing hardware. IC Role / Device Role / Timing Role: Fast-response TVS absorbing switching noise and external surge coupled onto input bus. Use Value: Sub-1 ns response time prevents transient propagation into converter control IC, avoiding false shutdown or latch-up. |
Use Scenario: Output of common-mode choke + X-cap filter in 48 V telecom rectifier supplying base station radios. IC Role / Device Role / Timing Role: Secondary protection device after primary MOV, suppressing residual differential-mode spikes. Use Value: Low clamping ratio (VC/VWM = 1.66) ensures filtered output stays within 12 V rail tolerance of sensitive RF ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for commercial-grade assemblies where halogen content is unrestricted. | Select E3/52 for cost-sensitive non-automotive designs; M3/52 required for halogen-free compliance programs. |
| SMBJ12CA-M3/52 | Bidirectional variant; symmetric VBR (13.3–14.7 V) in both polarities; no polarity marking. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) where reverse voltage may occur. | Choose SMBJ12CA-M3/52 only when bidirectional clamping is mandated; unidirectional SMBJ12A-M3/52 offers lower leakage and tighter VBR tolerance. |
Compared with SMBJ12A-E3/52, the M3/52 version adds halogen-free compliance without sacrificing clamping performance or thermal rating; versus SMBJ12CA-M3/52, the unidirectional SMBJ12A-M3/52 delivers superior reverse leakage control and is optimized for DC power rail protection where polarity is fixed.
Availability
SMBJ12A-M3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and DC-DC converter input stages requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance.
Supply support for SMBJ12A-M3/52 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, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The SMBJ series was developed for high-energy transient suppression in space-constrained surface-mount applications, targeting industrial, automotive, and telecom systems demanding consistent clamping performance across temperature and lifetime.
FAQ
What is the maximum clamping voltage of SMBJ12A-M3/52 under standard test conditions?
The SMBJ12A-M3/52 has a maximum clamping voltage (VC) of 19.9 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPPM) of 30.2 A. This value is measured at TA = 25 °C on specified PCB pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ12A-M3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ12A-M3/52 suitable for automotive applications?
SMBJ12A-M3/52 itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMBJ12A-HM3_X variant (e.g., SMBJ12A-HM3_B/H) which carries AEC-Q101 qualification. The SMBJ12A-M3/52 shares identical electrical characteristics and package dimensions, making it suitable for non-safety-critical automotive subsystems where qualification is not mandated. Always verify compliance requirements before deployment.
How does the M3 suffix affect the environmental compliance of SMBJ12A-M3/52?
The M3 suffix indicates that SMBJ12A-M3/52 is halogen-free and RoHS-compliant, meeting IPC-1752A material declaration standards. Unlike the E3 suffix (RoHS-compliant but containing brominated flame retardants), M3 uses alternative flame-retardant molding compounds with zero bromine/chlorine content. This makes SMBJ12A-M3/52 suitable for green electronics initiatives and markets enforcing strict halogen restrictions.
What is the thermal resistance and recommended PCB layout for SMBJ12A-M3/52?
The SMBJ12A-M3/52 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. To achieve full 600 W peak pulse power rating, each pad must be solid copper with minimum 1 oz. thickness and direct thermal connection to internal ground planes. Reduced pad area increases RθJA and requires derating per Figure 2 in the datasheet.
Can SMBJ12A-M3/52 be used in bidirectional signal protection?
No - SMBJ12A-M3/52 is a unidirectional TVS diode, with polarity marked by a cathode band; it conducts only when the cathode is positive relative to the anode. For bidirectional signal lines such as RS-485 or CAN, the SMBJ12CA-M3/52 variant must be used. Attempting to use SMBJ12A-M3/52 on AC or reversibly biased signals risks permanent failure due to forward conduction during negative half-cycles.
SMBJ12A-M3/52 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-M3/52 FAQ
1.How can I place an order for SMBJ12A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12A-M3/52 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-M3/52 reliable?
The price and inventory of SMBJ12A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ12A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12A-M3/52?
SMBJ12A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12A-M3/52 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-M3/52?
For technical support, including SMBJ12A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12A-M3/52 requirements.
6.How does Aetrix verify that SMBJ12A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ12A-M3/52 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-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ12A-M3/52?
All SMBJ12A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12A-M3/52, 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-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ12A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12A-M3/52 Tags
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