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Vishay General Semiconductor - Diodes Division SMA5J12A-E3/5A
- Part No.:
- SMA5J12A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J12A-E3/5A.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,456
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Product details
Overview
SMA5J12A-E3/5A 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 safeguard MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J12A-E3/5A datasheet, SMA5J12A-E3/5A pinout, SMA5J12A-E3/5A application, or SMA5J12A-E3/5A equivalent, this page delivers verified electrical parameters, thermal derating behavior, RoHS-compliant commercial-grade sourcing, and AEC-Q101-qualified alternatives for automotive ECU and battery management system design.
Technical Context
The SMA5J12A-E3/5A operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transients induced by inductive switching or ESD events. Its low incremental surge resistance and stable clamping performance under repetitive 10/1000 µs pulses enable reliable protection without sacrificing signal integrity on 12 V rail inputs.
Thermal design is constrained by RθJA = 80 °C/W (typ.) and TJ(max) = 150 °C, requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for rated 500 W dissipation. Polarity is marked by cathode band; no marking applies to bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for 12 V systems. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on above nominal rail. |
| VC @ IPPM | 19.9 V at 25.1 A - Clamped voltage during 500 W transient; limits downstream device stress to ≤20 V. |
| PPPM | 500 W - Peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 surge immunity. |
| IFSM | 40 A - Non-repetitive forward surge current (8.3 ms half-sine); protects against load dump in automotive 12 V circuits. |
| TJ(max) | +150 °C - Maximum junction temperature; enables operation in under-hood environments with proper PCB thermal relief. |
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; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / surge return path | Connected to protected line ground or low-side reference; completes clamping loop during overvoltage. |
| Cathode | Reverse-biased clamping node | Connected to protected line input (e.g., 12 V rail); avalanche conduction initiates here during transients. |
Key Features
| Feature | Design Value |
|---|---|
| Low profile SMA package | Enables automated placement on dense PCBs while maintaining 500 W surge capability in < 2.5 mm height. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage (<1 µA at VWM) across temperature and humidity stress. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow without popcorn effect or bond wire damage; no pre-bake required. |
| AEC-Q101 qualification option | Available via HE3 suffix (e.g., SMA5J12AHE3_A); validated for automotive under-hood reliability per stress test requirements. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V battery feed to engine control unit exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamping diode placed between input rail and ground. Use Value: Limits transient voltage to ≤19.9 V during 500 W surges, preventing damage to LDOs and microcontrollers rated for 24 V absolute max. |
Use Scenario: Analog output line (e.g., 4–20 mA current loop) from pressure sensor in factory automation cabinet. IC Role / Device Role / Timing Role: Low-capacitance transient clamp on signal conductor referenced to local ground. Use Value: Suppresses fast EFT bursts (IEC 61000-4-4) without distorting 1 kHz bandwidth signals due to minimal junction capacitance. |
| DC-DC Converter Input Stage | USB Port VBUS Overvoltage Guard |
Use Scenario: 12 V input to isolated flyback converter powering isolated CAN transceivers. IC Role / Device Role / Timing Role: Primary surge suppression before input capacitor and controller IC. Use Value: Absorbs energy from relay coil flyback without degrading efficiency; clamps within 1 ns to protect primary-side MOSFET gate driver. |
Use Scenario: VBUS line on USB Type-A port in industrial tablet subjected to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V supply rail upstream of USB power switch. Use Value: Maintains 12 V standoff margin (VWM = 12 V) while clamping ESD >15 kV (contact) to <30 V, preserving USB enumeration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J12AHE3_A | RoHS-compliant + AEC-Q101 qualified; identical electrical specs but validated for automotive temperature cycling and HTRB. | Required for automotive ECUs, body controllers, and ADAS modules where qualification traceability is mandated. | Select when automotive PPAP compliance and extended lifetime validation are required; same footprint and assembly process. |
| SMB5J12A-E3/52 | Same VWM/VC specs but in SMB (DO-214AA) package; 20 % larger footprint, 10 % higher RθJA (88 °C/W). | Better suited for manual repair or lower-density boards where thermal margin exceeds 500 W requirement. | Choose if board layout allows larger pad area and thermal relief is less constrained; not drop-in due to different land pattern. |
Compared with SMA5J12A-E3/5A, the HE3 variant adds automotive qualification without altering electrical behavior, while the SMB5J12A offers mechanical robustness at the cost of PCB area and thermal efficiency - both require explicit validation for new designs.
Availability
SMA5J12A-E3/5A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and DC-DC converter input staging requiring stable component supply, full RoHS compliance, and 7500-unit reel delivery.
Supply support for SMA5J12A-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, and protection devices with emphasis on reliability, power density, and automotive-grade qualification.
The SMA5J series was developed to deliver high-power transient suppression in compact surface-mount packages for 12 V and 24 V systems, targeting automotive, industrial, and telecom infrastructure where space and surge immunity are critical.
FAQ
What is the maximum clamping voltage of the SMA5J12A-E3/5A under rated surge conditions?
The SMA5J12A-E3/5A clamps to 19.9 V at its rated peak pulse current of 25.1 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream 24 V-tolerant ICs. The SMA5J12A-E3/5A maintains this clamping performance across its full operating temperature range.
Is the SMA5J12A-E3/5A suitable for automotive applications?
The SMA5J12A-E3/5A is RoHS-compliant and commercial-grade; it is not AEC-Q101 qualified in this specific suffix. For automotive use, select SMA5J12AHE3_A instead. The SMA5J12A-E3/5A may be used in non-safety-critical aftermarket or industrial-adjacent systems, but the SMA5J12A-E3/5A itself lacks the stress-test validation required for OEM vehicle deployment.
What is the thermal resistance and how does it affect PCB layout for the SMA5J12A-E3/5A?
The SMA5J12A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. To sustain 500 W peak power, PCB layout must provide adequate copper area and thermal vias; reducing pad size increases junction temperature and derates pulse power per Figure 2 in the datasheet. The SMA5J12A-E3/5A requires this defined layout to meet its published ratings.
Does the SMA5J12A-E3/5A have polarity marking, and how is it oriented in circuit?
Yes - the SMA5J12A-E3/5A is unidirectional and marked with a cathode band at one end. During normal operation, the cathode connects to the protected line (e.g., 12 V rail), and the anode connects to ground or return path. Reverse orientation prevents clamping action and risks catastrophic failure under surge. The SMA5J12A-E3/5A must be placed with correct polarity to function as specified.
What is the leakage current specification for the SMA5J12A-E3/5A at its stand-off voltage?
At VWM = 12 V and TA = 25 °C, the SMA5J12A-E3/5A exhibits maximum reverse leakage current (ID) of 1.0 µA. This low leakage ensures minimal power loss in always-on 12 V monitoring circuits and avoids false triggering in high-impedance sensor bias networks. The SMA5J12A-E3/5A maintains this spec across its full -55 °C to +150 °C junction temperature range.
SMA5J12A-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:
- 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-E3/5A FAQ
1.How can I place an order for SMA5J12A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J12A-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 SMA5J12A-E3/5A reliable?
The price and inventory of SMA5J12A-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 SMA5J12A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J12A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J12A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J12A-E3/5A?
SMA5J12A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J12A-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 SMA5J12A-E3/5A?
For technical support, including SMA5J12A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J12A-E3/5A requirements.
6.How does Aetrix verify that SMA5J12A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J12A-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 SMA5J12A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J12A-E3/5A?
All SMA5J12A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J12A-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 SMA5J12A-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J12A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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