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Vishay General Semiconductor - Diodes Division SMAJ11A-E3/61
- Part No.:
- SMAJ11A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11A-E3/61.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ11A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection on power rails and signal lines. It features a 11 V standoff voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, clamps transients to ≤18.2 V at 22 A peak pulse current (IPPM), and delivers 400 W peak pulse power (10/1000 μs waveform) - deployed in automotive ECUs, industrial sensor interfaces, and USB power input stages.
For engineers reviewing the SMAJ11A-E3/61 datasheet, SMAJ11A-E3/61 pinout, SMAJ11A-E3/61 application, or SMAJ11A-E3/61 equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) package compatibility with automated SMT assembly, AEC-Q101 qualification status (via HE3 suffix variants), and verified clamping performance under IEC 61000-4-5 surge conditions.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device: when reverse voltage exceeds VBR, it avalanches into low-impedance conduction, limiting downstream voltage to VC ≤ 18.2 V at IPPM = 22 A. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at VWM = 11 V).
Thermally, it exhibits RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and supports continuous operation up to TJ = 150 °C. The 3.3 W steady-state power dissipation (PD) and 40 A non-repetitive surge rating (IFSM) enable robust handling of repetitive switching transients and lightning-induced surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC rail margin. |
| VBR (min/max) | 12.2 V / 13.5 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | ≤18.2 V at 22 A (10/1000 μs) - Clamping voltage directly protects downstream ICs rated for ≤20 V absolute maximum. |
| PPPM | 400 W - Peak surge energy absorption capacity; meets IEC 61000-4-5 Level 4 (4 kV) requirements when properly laid out. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); supports motor driver or relay coil flyback suppression. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMT footprint; compatible with IPC-7351B land patterns and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., +12 V rail); conducts surge current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop with minimal trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge immunity testing up to 4 kV in standard PCB layouts. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during fast transients, reducing stress on downstream MOSFETs and LDOs. |
| MSL Level 1 (JEDEC J-STD-020) | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics. |
| AEC-Q101 qualified variant available | HE3 suffix versions meet automotive-grade reliability requirements for engine control, body electronics, and ADAS subsystems. |
| 0.064 g unit weight | Supports high-speed pick-and-place placement with minimal nozzle wear and positional drift. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V battery-fed ECU power rail exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter input. Use Value: Limits transient excursions to ≤18.2 V, preventing damage to 24 V-rated buck controllers and enabling single-stage protection architecture. |
Use Scenario: 4–20 mA current loop interface in factory automation PLC modules subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional transient shunt on analog input terminals (with SMAJ11CA variant) or unidirectional rail clamp on supply side. Use Value: Sub-10 ns response time arrests ESD pulses before they reach precision op-amps, preserving measurement accuracy and avoiding latch-up. |
| USB Type-C VBUS Surge Suppression | Motor Drive Gate Driver Supply Clamp |
Use Scenario: VBUS line in portable docking stations encountering hot-plug surges and contact bounce during connector mating. IC Role / Device Role / Timing Role: Standoff-clamp TVS between VBUS and GND, sized to handle 10/1000 μs surges up to 400 W. Use Value: Maintains VBUS within ±5% of 5 V nominal during transients, ensuring USB PD negotiation integrity and preventing port controller reset. |
Use Scenario: 15 V gate drive supply rail for N-channel MOSFET half-bridges in BLDC inverters experiencing shoot-through-induced voltage spikes. IC Role / Device Role / Timing Role: Fast-response clamp protecting gate driver ICs (e.g., IR2104) from >30 V transients. Use Value: Clamps spikes to ≤18.2 V within nanoseconds, eliminating need for external Zener+capacitor snubbers and reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and thermal performance. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU medical devices). | Choose SMAJ11A-M3/61 when halogen-free bill-of-materials reporting is required; same layout and qualification. |
| SMAJ11AHE3_A/61 | AEC-Q101 qualified; same VWM, VBR, VC, and PPPM, but validated for automotive temperature cycling and HTRB. | Required for automotive OEM designs; not necessary for commercial/industrial applications. | Select SMAJ11AHE3_A/61 only for automotive programs requiring AEC-Q101 documentation; otherwise, standard E3 suffices. |
Compared with SMAJ11A-M3/61 and SMAJ11AHE3_A/61, the SMAJ11A-E3/61 provides baseline commercial-grade surge protection with full RoHS compliance but no halogen-free or automotive qualification - making it optimal for cost-sensitive industrial and consumer designs where those certifications are not mandated.
Availability
SMAJ11A-E3/61 is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial PLC analog inputs, and USB-C peripheral protection requiring stable component supply and consistent tape-and-reel delivery.
Supply support for SMAJ11A-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, efficiency, and manufacturability.
The SMAJ series targets board-level transient suppression in space-constrained applications, delivering standardized 400 W surge capability in the ultra-low-profile SMA package for automotive, industrial, and computing markets.
FAQ
What is the maximum clamping voltage of the SMAJ11A-E3/61 under standard test conditions?
The SMAJ11A-E3/61 clamps to a maximum of 18.2 V when subjected to a 10/1000 μs surge waveform at 22 A peak pulse current (IPPM). This value is measured per IEC 61000-4-5 and is guaranteed across the full operating temperature range (−55 °C to +150 °C). The clamping voltage directly determines the protection margin for downstream components like microcontrollers or power management ICs.
Is the SMAJ11A-E3/61 suitable for bidirectional transient suppression?
No - the SMAJ11A-E3/61 is a unidirectional TVS diode, with cathode marked by a band. For bidirectional protection, the SMAJ11CA variant must be used. The "A" suffix denotes unidirectional configuration; "CA" indicates symmetrical breakdown in both polarities. Using SMAJ11A-E3/61 on AC-coupled or floating signal lines risks forward conduction and failure.
Does the SMAJ11A-E3/61 meet automotive qualification standards?
The SMAJ11A-E3/61 itself is commercial-grade and not AEC-Q101 qualified. However, Vishay offers the pin-compatible SMAJ11AHE3_A/61 variant, which carries full AEC-Q101 qualification for temperature cycling, HTRB, and mechanical shock. Engineers designing for automotive applications should specify the HE3 suffix version to ensure compliance with OEM reliability requirements.
What is the thermal resistance from junction to ambient for the SMAJ11A-E3/61?
The SMAJ11A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and natural convection cooling. For higher-power or elevated-ambient applications, thermal relief traces or additional copper area should be added to reduce effective RθJA.
How does the SMAJ11A-E3/61 compare to SMAJ10A-E3/61 in terms of voltage ratings?
The SMAJ11A-E3/61 has a 11 V standoff voltage (VWM) and 12.2–13.5 V breakdown range, while SMAJ10A-E3/61 specifies 10 V VWM and 11.1–12.3 V VBR. This 1 V increase allows SMAJ11A-E3/61 to protect 12 V systems with tighter margin against normal ripple, whereas SMAJ10A-E3/61 suits 9–10 V logic rails or lower-voltage sensor supplies where lower clamping is critical.
SMAJ11A-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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 22A
- 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)
SMAJ11A-E3/61 FAQ
1.How can I place an order for SMAJ11A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11A-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 SMAJ11A-E3/61 reliable?
The price and inventory of SMAJ11A-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 SMAJ11A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ11A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11A-E3/61?
SMAJ11A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11A-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 SMAJ11A-E3/61?
For technical support, including SMAJ11A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11A-E3/61 requirements.
6.How does Aetrix verify that SMAJ11A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ11A-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 SMAJ11A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ11A-E3/61?
All SMAJ11A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11A-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 SMAJ11A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ11A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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