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Vishay General Semiconductor - Diodes Division SMA5J12A-E3/61
- Part No.:
- SMA5J12A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J12A-E3/61.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,050
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Product details
Overview
SMA5J12A-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR), 19.9 V clamping voltage (VC) at 25.1 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J12A-E3/61 datasheet, SMA5J12A-E3/61 pinout, SMA5J12A-E3/61 application, or SMA5J12A-E3/61 equivalent, key selection criteria include clamping performance under 25.1 A surge, thermal resistance (RθJA = 80 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (13.3–14.7 V), it avalanches rapidly (<1 ns response) to limit transient energy. Its glass-passivated junction ensures stable leakage (<1.0 μA at 12 V) and robust surge handling up to 40 A IFSM (8.3 ms half-sine).
Designed for surface-mount reliability, it meets MSL Level 1 per J-STD-020 (260 °C peak reflow), supports bidirectional variants via CA suffix, and delivers consistent clamping (VC = 19.9 V) across its specified operating junction temperature range of –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 12 V rail protection. |
| VBR (min/max) | 13.3 V / 14.7 V - breakdown threshold at 1 mA test current; ensures reliable triggering above nominal supply. |
| VC @ IPPM | 19.9 V at 25.1 A - clamped voltage during 500 W 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 500 W - peak pulse power dissipation capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| IPPM | 25.1 A - peak pulse current supported at VC; correlates directly with surge energy absorption (W × s). |
| RθJA | 80 °C/W - junction-to-ambient thermal resistance; requires minimum 5.0 mm × 5.0 mm copper pad for rated power derating. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band on body; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / surge return path | Connected to ground or low-impedance return node; completes clamping loop during transients. |
| Cathode | Reverse-biased terminal / protected line connection | Connected to line being protected (e.g., 12 V supply); avalanche conduction occurs here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Low incremental surge resistance | Enables tighter VC–VBR margin (ΔV = 7.2 V), improving protection headroom for sensitive 12 V logic interfaces. |
| Glass passivated chip junction | Ensures stable leakage (<1.0 μA) and long-term reliability under thermal cycling and humidity stress. |
| MSL Level 1 rating | Supports single-reflow assembly without moisture sensitivity concerns - no bake required prior to SMT placement. |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive applications; this E3/61 variant is commercial-grade but shares identical die and package design. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and inductive switching transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp surges up to 500 W. Use Value: Limits transient voltage to ≤19.9 V, preventing damage to downstream CAN transceivers and microcontrollers rated for 16 V absolute max. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Standoff-rated TVS on 4–20 mA loop or 0–10 V output line, absorbing field-induced surges before reaching ADC input. Use Value: Maintains signal integrity by clamping transients within 1 ns while adding <1.0 μA leakage at 12 V, avoiding offset errors. |
| Consumer DC Power Adapter Input | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-side overvoltage protection on 12 V output of wall adapters powering routers and set-top boxes. IC Role / Device Role / Timing Role: Primary clamping device on regulated DC output, coordinated with upstream MOVs and fuses. Use Value: Withstands repetitive 500 W surges without degradation, enabling compliance with UL 62368-1 transient immunity requirements. | Use Scenario: Back-to-back protection on Ethernet PHY power rails (e.g., 3.3 V, 5 V, 12 V) in enterprise switches. IC Role / Device Role / Timing Role: Unidirectional TVS on each rail, selected for precise VWM/VC match to avoid false triggering during normal operation. Use Value: 19.9 V clamping ensures protected ASICs remain below their 20 V absolute maximum rating during lightning-induced surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/61 | Lower PPPM (400 W vs. 500 W); same VWM, VBR, VC, and package. | Not suitable for IEC 61000-4-5 Level 4; limited to Level 3 or lower-energy transients. | Select SMA5J12A-E3/61 when full 500 W surge margin is required for harsh environments. |
| 1.5SMC12A | Same electrical specs but in larger SMC (DO-214AB) package; RθJA = 50 °C/W vs. 80 °C/W. | Better thermal performance allows higher sustained surge duty cycles; requires larger PCB footprint. | Choose 1.5SMC12A only if board layout permits larger package and thermal management is critical. |
Compared with SMAJ12A-E3/61 and 1.5SMC12A, SMA5J12A-E3/61 delivers the highest surge power density in the SMA footprint - enabling compact 12 V rail protection where space and 500 W capability are both constraints.
Availability
SMA5J12A-E3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and consumer DC adapter protection requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SMA5J12A-E3/61 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, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained SMT applications - targeting automotive, industrial, and telecom systems where 500 W surge capability must coexist with minimal PCB area.
FAQ
What is the maximum clamping voltage of the SMA5J12A-E3/61 under standard test conditions?
The SMA5J12A-E3/61 has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current of 25.1 A using the 10/1000 μs waveform. This value is measured at TA = 25 °C with devices mounted on 5.0 mm × 5.0 mm copper pads per terminal, and defines the upper voltage limit imposed on protected circuits during surge events.
Is the SMA5J12A-E3/61 suitable for automotive applications?
The SMA5J12A-E3/61 is RoHS-compliant and qualified to MSL Level 1, but it is a commercial-grade part (E3 suffix). For AEC-Q101-qualified automotive use, Vishay offers the SMA5J12AHE3_A variant (HE3 suffix). The SMA5J12A-E3/61 shares identical electrical and mechanical characteristics but lacks formal automotive qualification documentation.
What does the "/61" suffix indicate in SMA5J12A-E3/61?
The "/61" suffix in SMA5J12A-E3/61 specifies the packaging configuration: 7-inch diameter plastic tape and reel, with a base quantity of 1800 units per reel. This format is optimized for high-speed pick-and-place SMT assembly and is distinct from "/5A" (13-inch reel, 7500 units) or "/H" (7-inch reel with AEC-Q101 qualification).
How does the thermal resistance of SMA5J12A-E3/61 affect PCB layout?
The SMA5J12A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W, which assumes mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size increases thermal impedance, causing higher junction temperatures during repeated surges - so maintaining the recommended pad layout is essential to sustain its 500 W rating.
Can SMA5J12A-E3/61 be used in bidirectional configurations?
No - SMA5J12A-E3/61 is a unidirectional TVS diode, identified by the "A" (not "CA") suffix and cathode band marking. For bidirectional operation, Vishay specifies the SMA5J12CA variant, which provides symmetrical clamping in both polarities and carries no polarity marking. Using SMA5J12A-E3/61 in reverse-biased AC applications risks permanent failure.
SMA5J12A-E3/61 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:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J12A-E3/61 FAQ
1.How can I place an order for SMA5J12A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J12A-E3/61 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 SMA5J12A-E3/61 reliable?
The price and inventory of SMA5J12A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J12A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMA5J12A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J12A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J12A-E3/61?
SMA5J12A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J12A-E3/61 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 SMA5J12A-E3/61?
For technical support, including SMA5J12A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J12A-E3/61 requirements.
6.How does Aetrix verify that SMA5J12A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMA5J12A-E3/61 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 SMA5J12A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMA5J12A-E3/61?
All SMA5J12A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J12A-E3/61, 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 SMA5J12A-E3/61 part is unused and in its original packaging.
Return procedure for SMA5J12A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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