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Vishay General Semiconductor - Diodes Division SMA6J12A-E3/5A
- Part No.:
- SMA6J12A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J12A-E3/5A.pdf
- Description:
- TVS DIODE 12VWM 23.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,039
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Product details
Overview
SMA6J12A-E3/5A 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 at 31.9 A (10/1000 μs), 600 W peak pulse power rating, and operates across –55 °C to +150 °C junction temperature range. It protects MOSFETs, ICs, and sensor signal lines in industrial power supplies.
For engineers reviewing the SMA6J12A-E3/5A datasheet, SMA6J12A-E3/5A pinout, SMA6J12A-E3/5A application, or SMA6J12A-E3/5A equivalent, key selection criteria include clamping voltage at rated IPP, unidirectional polarity requirement, SMA package thermal resistance (RθJA = 120 °C/W), and compliance with J-STD-020 MSL level 1 reflow profile.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias (≤12 V), it presents <1 μA leakage; during transient overvoltage exceeding VBR (13.3–14.7 V), it avalanches to clamp the line at ≤18.8 V for 10/1000 μs surges up to 31.9 A. Its dynamic resistance is 0.128 Ω, enabling fast response to ESD and inductive switching spikes.
The device uses silicon avalanche junction technology with matte tin-plated leads solderable per J-STD-002, housed in UL 94 V-0 compliant molding compound. Polarity is marked by cathode band; it is not bidirectional and does not support reverse-biased operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Avalanche onset range; determines minimum overvoltage triggering point. |
| VC @ IPP | 18.8 V at 31.9 A (10/1000 μs) - Clamped voltage seen by protected circuit during standardized surge event. |
| PPPM (10×1000 μs) | 600 W - Peak transient energy absorption capability under long-duration surge waveform. |
| ID @ VWM | ≤0.2 μA - Reverse leakage current at stand-off voltage; ensures minimal standby power loss and signal integrity. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on PCB with 5.0 mm × 5.0 mm copper pads; guides heatsinking requirements. |
| Polarity | Unidirectional - Cathode-anode configuration only; requires correct orientation in series with protected line. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.20 mm (L × W × H); weight 0.064 g; RoHS-compliant (E3 suffix), MSL level 1, LF peak 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamping | Connected to lower-potential side of protected line (e.g., GND or return path); must be routed with low-inductance trace. |
| Cathode | Current exit terminal during clamping; marked by color band | Connected to higher-potential side (e.g., VBUS or signal line); polarity reversal causes open-circuit failure mode. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 18.8 V max VC at 31.9 A (10/1000 μs) enables robust protection of 12 V logic and power rails without overstressing downstream components. |
| Low leakage | ≤0.2 μA at 12 V reduces standby current drain and avoids false triggering in high-impedance sensor interfaces. |
| Automated placement compatibility | SMA (DO-214AC) footprint supports standard SMT pick-and-place; no lead forming required. |
| Thermal reliability | Rated for TJ up to +150 °C and meets JESD22-B102 whisker test (E3 suffix), ensuring long-term stability in industrial environments. |
| Flammability safety | UL 94 V-0 compliant molding compound prevents flame propagation during fault conditions. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: Suppresses load-dump and inductive kickback transients on 12 V DC input rails of programmable logic controllers and motor drivers. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between input rail and ground, triggered within nanoseconds of overvoltage onset. Use Value: Limits voltage excursion to ≤18.8 V, preventing damage to upstream DC-DC converters and microcontrollers rated for 16 V absolute maximum. |
Use Scenario: Protects LIN bus and switch inputs in BCMs from battery voltage spikes during jump-start or alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional clamping diode installed at connector interface, absorbing 8/20 μs surges up to 4000 W peak power. Use Value: Maintains signal integrity below 12 V threshold while surviving 50 A IFSM surge, meeting ISO 7637-2 Pulse 1/2a immunity requirements. |
| Consumer Appliance Motor Drive Circuits | Industrial Sensor Signal Line Protection |
Use Scenario: Guards gate-drive traces of half-bridge MOSFETs in washing machine motor inverters against commutation-induced ringing. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to power stage, clamping fast-rising edge transients (<10 ns rise time). Use Value: Dynamic resistance of 0.128 Ω minimizes voltage overshoot during 31.9 A transient, preserving MOSFET VGS rating. |
Use Scenario: Shields analog outputs (e.g., 4–20 mA current loop) of pressure and temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤0.2 μA) unidirectional suppressor placed in series with signal line and grounded via 100 nF capacitor. Use Value: Stand-off voltage of 12 V allows full-scale sensor output swing while clamping ESD pulses to safe levels per IEC 61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J12CA-E3/5A | Bidirectional variant with symmetrical ±12 V VWM and dual avalanche junction; same package and clamping specs. | Required where AC-coupled or bipolar signal lines (e.g., RS-485, CAN) need protection on both polarities. | Select SMA6J12CA-E3/5A only if bidirectional clamping is mandated; SMA6J12A-E3/5A is lower-cost and sufficient for DC rails. |
| SMCJ12A-E3/57T | Higher-power SMC (DO-214AB) package: 1500 W PPPM (10×1000 μs), 100 A IPPM, RθJA = 40 °C/W, same VWM/VBR/VC. | Suitable for systems requiring >600 W surge handling or extended thermal margin in high-ambient environments (>85 °C). | Choose SMCJ12A-E3/57T when board space permits larger package and higher surge endurance is critical; SMA6J12A-E3/5A fits tighter layouts. |
Compared with SMA6J12CA-E3/5A, the SMA6J12A-E3/5A offers lower cost and simpler layout for unidirectional DC protection; versus SMCJ12A-E3/57T, it trades surge capacity for compactness and lower thermal mass-ideal for space-constrained consumer and industrial PCBs.
Availability
SMA6J12A-E3/5A is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control module inputs, and consumer appliance motor drive circuits requiring stable component supply, RoHS compliance, and MSL level 1 reflow capability.
Supply support for SMA6J12A-E3/5A 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 devices, and optoelectronics with emphasis on reliability, precision, and high-volume manufacturability.
The SMA6JxxA series is part of Vishay's Transient Voltage Suppressor portfolio, engineered specifically for surface-mount surge protection of DC power rails and low-speed signal lines in harsh industrial and automotive environments.
FAQ
What is the maximum clamping voltage of the SMA6J12A-E3/5A under a 10/1000 μs surge?
The SMA6J12A-E3/5A has a maximum clamping voltage (VC) of 18.8 V when subjected to a 10/1000 μs surge waveform at its rated peak pulse current of 31.9 A. This value is measured per JEDEC standards and confirmed in the Vishay datasheet revision 09-Jan-2024, Document Number 89460. The SMA6J12A-E3/5A maintains this clamping performance across its specified operating temperature range.
Is the SMA6J12A-E3/5A suitable for bidirectional signal line protection?
No, the SMA6J12A-E3/5A is unidirectional only, with cathode-band marking and asymmetric IV characteristics. It conducts only when the cathode is positive relative to the anode. For bidirectional protection (e.g., RS-485 or USB D+/D−), the SMA6J12CA-E3/5A variant must be used instead. The SMA6J12A-E3/5A will not clamp negative transients.
What is the thermal resistance and recommended pad layout for the SMA6J12A-E3/5A?
The SMA6J12A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on PCBs with 5.0 mm × 5.0 mm copper pads per terminal. This pad size is specified in the Vishay datasheet and is essential to achieve rated power dissipation and junction temperature limits. Smaller pads increase thermal impedance and risk premature thermal failure during repeated surges.
Does the SMA6J12A-E3/5A meet automotive qualification standards?
The SMA6J12A-E3/5A is industrial-grade and RoHS-compliant but is not AEC-Q200 qualified. It meets J-STD-020 MSL level 1 and JESD22-B102 whisker testing, supporting use in automotive body electronics where full qualification is not mandated. For AEC-Q200-compliant designs, engineers should verify system-level validation or consider Vishay's automotive-qualified TVS alternatives.
What is the leakage current specification for the SMA6J12A-E3/5A at its stand-off voltage?
The SMA6J12A-E3/5A exhibits a maximum reverse leakage current (ID) of 0.2 μA at its 12 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes quiescent power loss in battery-powered systems. The SMA6J12A-E3/5A maintains this spec across its full operating temperature range.
SMA6J12A-E3/5A 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:
- 23.5V
- Current - Peak Pulse (10/1000µs):
- 157A (8/20µs)
- Power - Peak Pulse:
- 4000W (4kW)
- 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-E3/5A FAQ
1.How can I place an order for SMA6J12A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J12A-E3/5A 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-E3/5A reliable?
The price and inventory of SMA6J12A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J12A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J12A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J12A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J12A-E3/5A?
SMA6J12A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J12A-E3/5A 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-E3/5A?
For technical support, including SMA6J12A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J12A-E3/5A requirements.
6.How does Aetrix verify that SMA6J12A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J12A-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J12A-E3/5A?
All SMA6J12A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J12A-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMA6J12A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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