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Vishay General Semiconductor - Diodes Division SMAJ12A-E3/61
- Part No.:
- SMAJ12A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12A-E3/61.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:162,649
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Product details
Overview
SMAJ12A-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, clamps transients to ≤19.9 V at 20.1 A peak pulse current (IPPM), and delivers 400 W peak pulse power (10/1000 μs waveform) - ideal for safeguarding MOSFET gates, microcontroller I/O lines, and sensor signal paths in industrial power supplies.
For engineers reviewing the SMAJ12A-E3/61 datasheet, SMAJ12A-E3/61 pinout, SMAJ12A-E3/61 application, or SMAJ12A-E3/61 equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) surface-mount package, 1.0 μA max reverse leakage at VWM, 150 °C max junction temperature, and AEC-Q101 qualification availability via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling precise, repeatable clamping performance under repetitive 10/1000 μs surges at 0.01% duty cycle.
The SMAJ12A-E3/61 exhibits fast response time (<1.0 ps), low clamping ratio (VC/VBR ≈ 1.41), and thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads - supporting reliable operation in space-constrained, thermally demanding environments such as automotive body control modules and industrial PLC I/O cards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC bias margin for protected line. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 19.9 V at 20.1 A - clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - peak pulse power handling (10/1000 μs); supports protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω). |
| ID @ VWM | 1.0 μA max - ultra-low reverse leakage at rated stand-off; prevents excessive quiescent power loss in battery-powered systems. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive and high-temperature industrial enclosures. |
| Package | SMA (DO-214AC) - industry-standard SMD outline with 5.28 mm × 4.50 mm footprint and matte tin-plated leads compliant with J-STD-002. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, unidirectional polarity with cathode band marking. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential rail; forms return path during avalanche conduction. |
| Cathode | Protected line interface | Connected to signal/power line being protected; carries full surge current during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge immunity requirements up to 1 kV open-circuit voltage in 2 Ω source impedance configurations. |
| Low clamping voltage (19.9 V @ 20.1 A) | Restricts voltage overshoot below 20 V during worst-case transients - critical for protecting 12 V logic interfaces and 16 V-rated MOSFETs. |
| Glass passivated junction | Delivers stable VBR over lifetime and temperature (-55 °C to +150 °C), minimizing drift-induced misclamping in harsh environments. |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow soldering at peak 260 °C without moisture-related popcorning or delamination. |
| AEC-Q101 qualified option (HE3 suffix) | Validated for automotive applications including engine control units and ADAS sensor interfaces requiring zero defect reliability. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protects 12 V CAN bus termination resistors and microcontroller GPIOs from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H/CAN_L lines and chassis ground to clamp negative-going spikes. Use Value: Limits voltage excursions to ≤19.9 V, preventing latch-up or gate oxide damage in 3.3 V/5 V CAN transceivers and MCU I/O cells. |
Use Scenario: Shields 24 V digital input optocoupler front-end from inductive kickback generated by solenoid valve switching. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across input terminals to divert >1 kV/500 A transients away from isolation barrier. Use Value: Maintains functional safety integrity by ensuring input stage remains within 24 V ±10% operating window during repeated 10/1000 μs surges. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply EMI Filter Stage |
|
Use Scenario: Guards BLDC motor controller gate drivers against cross-conduction-induced shoot-through voltage spikes. IC Role / Device Role / Timing Role: Fast-response TVS placed at half-bridge output nodes to clamp Miller-induced dv/dt overshoot during switching transitions. Use Value: Reduces risk of false triggering or destruction of 600 V Si MOSFETs by limiting transient peaks to <20 V above rail. |
Use Scenario: Suppresses differential-mode surges coupled onto AC input lines before entering primary-side EMI filter capacitors. IC Role / Device Role / Timing Role: Primary-side unidirectional TVS installed between L/N lines and earth ground to absorb common-mode energy. Use Value: Extends capacitor lifetime by reducing RMS ripple stress and prevents filter choke saturation during 6 kV lightning surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and clamping performance. | No difference in circuit function or layout; selected where halogen-free material compliance is mandated (e.g., EU medical devices). | Choose SMAJ12A-M3/61 when halogen-free bill-of-materials (BOM) certification is required without compromising protection capability. |
| SMAJ12CA-E3/61 | Bidirectional version with symmetric VBR (13.3–14.7 V) in both polarities; same VWM (12 V), VC (19.9 V), and PPPM (400 W). | Required for AC-coupled or bidirectional signal lines (e.g., RS-485, USB D+/D−) where polarity reversal must be suppressed. | Select SMAJ12CA-E3/61 only when protecting circuits subject to reversible transients - not a drop-in replacement for unidirectional use cases. |
Compared with SMAJ12A-E3/61, the M3 variant offers identical protection performance with halogen-free construction, while the CA variant adds bidirectional clamping at the cost of unnecessary complexity in DC-biased applications - making the base E3/61 optimal for cost-sensitive, unidirectional 12 V rail protection.
Availability
SMAJ12A-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, telecom power supplies, and consumer appliance control boards requiring stable component supply and long-term obsolescence management.
Supply support for SMAJ12A-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, precision, and automotive-grade qualification.
The SMAJ series was engineered specifically for high-energy transient suppression in compact SMD formats, targeting design-in across automotive, industrial, and communications infrastructure where board space and surge immunity are critical.
FAQ
What is the maximum clamping voltage of the SMAJ12A-E3/61 under a 10/1000 μs surge?
The SMAJ12A-E3/61 clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 20.1 A using the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and represents the upper limit of voltage seen by protected circuitry during worst-case transient events - critical for verifying compatibility with downstream IC absolute maximum ratings.
Does the SMAJ12A-E3/61 meet automotive qualification standards?
The SMAJ12A-E3/61 itself is commercial-grade; however, the functionally identical SMAJ12AHE3 variant is AEC-Q101 qualified. For automotive applications requiring certified reliability, specify the HE3 suffix. The SMAJ12A-E3/61 shares identical electrical characteristics and thermal behavior but lacks formal automotive stress-test validation per AEC-Q101 test plan.
Can the SMAJ12A-E3/61 be used in bidirectional signal protection?
No - the SMAJ12A-E3/61 is strictly unidirectional and will conduct only when cathode is positive relative to anode. For bidirectional protection (e.g., RS-485, audio lines), use SMAJ12CA-E3/61, which has symmetrical breakdown in both directions. Using SMAJ12A-E3/61 on AC signals risks forward conduction and permanent damage during negative half-cycles.
What is the thermal resistance of the SMAJ12A-E3/61 in standard mounting conditions?
The SMAJ12A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value assumes no additional heatsinking and defines the steady-state temperature rise under continuous 3.3 W power dissipation - essential for derating calculations in enclosed or high-ambient-temperature environments.
How does the SMAJ12A-E3/61 compare to SMAJ12A-M3/61 in terms of performance?
The SMAJ12A-E3/61 and SMAJ12A-M3/61 share identical electrical specifications, package dimensions, and thermal performance. The sole difference is material composition: M3 uses halogen-free molding compound, while E3 meets standard RoHS compliance. Both are fully interchangeable electrically and mechanically - selection depends solely on environmental compliance requirements, not functional trade-offs.
SMAJ12A-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):
- 20.1A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ12A-E3/61 FAQ
1.How can I place an order for SMAJ12A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12A-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 SMAJ12A-E3/61 reliable?
The price and inventory of SMAJ12A-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 SMAJ12A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ12A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12A-E3/61?
SMAJ12A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12A-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 SMAJ12A-E3/61?
For technical support, including SMAJ12A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12A-E3/61 requirements.
6.How does Aetrix verify that SMAJ12A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ12A-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 SMAJ12A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ12A-E3/61?
All SMAJ12A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12A-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 SMAJ12A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ12A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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