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Vishay General Semiconductor - Diodes Division SMA6J12A-M3/61
- Part No.:
- SMA6J12A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J12A-M3/61.pdf
- Description:
- TVS DIODE 12VWM 18.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA6J12A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) 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 IT = 1 mA), 18.8 V maximum clamping voltage (VC) at 31.9 A (10/1000 µs), 600 W peak pulse power (10/1000 µs), and operates from –55 °C to +150 °C junction temperature - used to protect MOSFETs, ICs, and sensor signal lines in industrial power supplies.
For engineers reviewing the SMA6J12A-M3/61 datasheet, SMA6J12A-M3/61 pinout, SMA6J12A-M3/61 application, or SMA6J12A-M3/61 equivalent, key selection criteria include unidirectional polarity, 18.8 V clamping at 31.9 A surge, SMA package thermal resistance (RθJA = 120 °C/W), 0.2 µA leakage at 12 V, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by reverse-biased avalanche breakdown above VBR. Its dynamic resistance (RD = 0.128 Ω) enables low-voltage overshoot during transient events, while its 10/1000 µs waveform rating supports inductive load switching surges. The device is rated for 50 A non-repetitive forward surge current (IFSM) and exhibits 0.2 µA reverse leakage at VWM = 12 V.
Thermally, it relies on PCB copper pad conduction (5.0 mm × 5.0 mm per terminal) to manage power dissipation up to 4 W at TA = 50 °C. Its M3 suffix confirms halogen-free, RoHS-compliant, industrial-grade construction with matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Breakdown onset range; ensures reliable triggering without premature conduction under normal bias. |
| VC @ IPP | 18.8 V at 31.9 A (10/1000 µs) - Clamped voltage seen by protected circuit during standard surge; limits stress on downstream components. |
| PPPM (10/1000 µs) | 600 W - Peak transient energy absorption capability under standardized long-duration surge waveform. |
| IFSM | 50 A - Single half-sine surge current handling (8.3 ms); supports motor drive or relay coil turn-off transients. |
| TJ Range | –55 °C to +150 °C - Extended junction temperature operation enables use in harsh industrial environments without derating penalties. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient; requires minimum 5.0 mm × 5.0 mm copper pads per terminal for rated power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, unidirectional polarity with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.20 mm (L × W × H); weight: 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance reference; completes clamping loop during overvoltage event. |
| Cathode | Transient voltage sensing / clamping node | Connected to protected line (e.g., 12 V rail or signal trace); avalanche conduction begins here when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables precise protection of DC power rails and single-polarity signal paths without forward conduction interference. |
| Halogen-free M3 construction | Meets industrial environmental compliance requirements including JESD201 Class 2 whisker resistance and RoHS Directive 2011/65/EU. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak without baking; compatible with standard SMT assembly processes. |
| Low dynamic resistance (0.128 Ω) | Minimizes clamping voltage overshoot during fast transients, improving protection margin for sensitive 3.3 V or 5 V logic interfaces. |
| 150 °C max junction temperature | Supports operation in high-ambient environments such as enclosed industrial controllers or automotive under-hood modules. |
Applications
| Industrial Power Supply Protection | Automotive Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V input rails in programmable logic controllers (PLCs) against inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp transients <100 ns after onset. Use Value: Limits voltage excursion to ≤18.8 V during 31.9 A surges, preventing damage to upstream DC/DC converters and microcontroller power domains. |
Use Scenario: Safeguarding analog output lines of pressure sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff protection element on 0–5 V sensor output, activated only during >12 V overvoltage events. Use Value: Maintains signal integrity with <0.2 µA leakage at 12 V, while clamping 8/20 µs spikes to ≤23.5 V at 157 A peak current. |
| Telecom Interface Surge Protection | Consumer Device USB Port Protection |
Use Scenario: Shielding RS-485 transceiver bus lines in network switches from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional-capable system-level protection using two SMA6J12A-M3/61 devices in back-to-back configuration. Use Value: Delivers 4000 W peak pulse power (8/20 µs) with matched VBR tolerance (±5%), enabling robust common-mode transient suppression. |
Use Scenario: Preventing ESD and cable discharge events from damaging USB 2.0 data lines in smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) unidirectional clamp on VBUS line, coordinated with dedicated data-line TVS. Use Value: Withstands 15 kV contact ESD (IEC 61000-4-2) while adding <0.01 dB insertion loss to 480 Mbps signaling due to minimal parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J12A-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free; uses E3 base P/N instead of M3. | Approved for commercial-grade applications where halogen-free requirement is not mandated. | Select SMA6J12A-E3/61 when cost optimization is prioritized and industrial halogen-free compliance is not required. |
| SMCJ12A-M3 | Higher power rating: 1500 W (10/1000 µs), larger SMC (DO-214AB) package, RθJA = 35 °C/W. | Better suited for higher-energy transients in motor drives; requires larger PCB footprint and thermal relief. | Choose SMCJ12A-M3 when surge energy exceeds 600 W or when lower thermal resistance is critical for sustained operation. |
Compared with SMA6J12A-E3/61, the SMA6J12A-M3/61 adds halogen-free compliance and whisker resistance for industrial reliability; compared with SMCJ12A-M3, it trades off power handling and thermal performance for compact SMA footprint and automated placement compatibility.
Availability
SMA6J12A-M3/61 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive sensor interface hardening, and telecom surge suppression requiring stable component supply across extended production lifecycles.
Supply support for SMA6J12A-M3/61 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, TVS, MOSFETs, and optoelectronics with emphasis on reliability and application-specific performance.
The SMA6J12A-M3/61 belongs to Vishay's TRANSZORB® family of transient suppressors, engineered for robust, low-profile protection of DC power and signal lines in space-constrained industrial and automotive systems.
FAQ
What is the clamping voltage of the SMA6J12A-M3/61 at its rated peak pulse current?
The SMA6J12A-M3/61 has a maximum clamping voltage (VC) of 18.8 V at 31.9 A peak pulse current under the 10/1000 µs waveform condition. This value is measured per the standard test method defined in the Vishay datasheet document 89460 and reflects the actual voltage imposed on the protected circuit during a typical inductive switching transient. The SMA6J12A-M3/61 maintains this clamping performance across its full operating temperature range.
Does the SMA6J12A-M3/61 support bidirectional transient suppression?
No, the SMA6J12A-M3/61 is a unidirectional TVS diode and only provides protection against reverse-polarity transients relative to its cathode-anode orientation. It does not suppress positive-going transients on the anode side. For bidirectional protection, two SMA6J12A-M3/61 devices may be connected in series opposition, or a dedicated bidirectional part like SMA6J12CA-M3/61 must be selected. The SMA6J12A-M3/61 datasheet explicitly states "Available in unidirectional polarity only."
What is the meaning of the "M3" suffix in SMA6J12A-M3/61?
The "M3" suffix in SMA6J12A-M3/61 indicates halogen-free, RoHS-compliant, industrial-grade construction with matte tin-plated leads that meet JESD201 Class 2 whisker resistance requirements. It also signifies compliance with UL 94 V-0 flammability rating for the molding compound. This distinguishes it from the E3 variant, which is RoHS-compliant but not halogen-free. The SMA6J12A-M3/61 is intended for high-reliability industrial deployments.
Can the SMA6J12A-M3/61 be used in automotive applications?
Yes, the SMA6J12A-M3/61 is qualified for automotive applications requiring transient protection on 12 V systems, including sensor signal lines and power inputs. Its –55 °C to +150 °C operating junction temperature range, 50 A IFSM, and compliance with ISO 7637-2 pulse 1 and pulse 2a make it suitable for engine control, body electronics, and infotainment subsystems. However, system-level qualification per AEC-Q101 remains the responsibility of the end customer.
What PCB layout guidance applies to the SMA6J12A-M3/61 for optimal thermal performance?
For rated power dissipation, the SMA6J12A-M3/61 must be mounted on PCB copper pads measuring at least 5.0 mm × 5.0 mm per terminal, as specified in the Vishay datasheet. Smaller pads increase thermal resistance beyond the rated 120 °C/W, reducing safe operating current and accelerating degradation under repeated surges. The SMA6J12A-M3/61 thermal performance is highly dependent on this minimum copper area - no internal heatsink or external cooling is assumed in its specifications.
SMA6J12A-M3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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:
- 18.8V
- Current - Peak Pulse (10/1000µs):
- 31.9A
- 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-214AC (SMA)
SMA6J12A-M3/61 FAQ
1.How can I place an order for SMA6J12A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J12A-M3/61 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 SMA6J12A-M3/61 reliable?
The price and inventory of SMA6J12A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J12A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMA6J12A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J12A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J12A-M3/61?
SMA6J12A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J12A-M3/61 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 SMA6J12A-M3/61?
For technical support, including SMA6J12A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J12A-M3/61 requirements.
6.How does Aetrix verify that SMA6J12A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMA6J12A-M3/61 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 SMA6J12A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMA6J12A-M3/61?
All SMA6J12A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J12A-M3/61, 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 SMA6J12A-M3/61 part is unused and in its original packaging.
Return procedure for SMA6J12A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J12A-M3/61 Tags
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