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Vishay General Semiconductor - Diodes Division SMAJ20A-E3/61
- Part No.:
- SMAJ20A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20A-E3/61.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ20A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 20 V standoff voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 12.3 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), commonly deployed on power rails and I/O lines in industrial motor drives and automotive ECUs.
For engineers reviewing the SMAJ20A-E3/61 datasheet, SMAJ20A-E3/61 pinout, SMAJ20A-E3/61 application, or SMAJ20A-E3/61 equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) package compatibility with automated SMT assembly, AEC-Q101 qualification eligibility (via HE3 suffix), and verified clamping performance under repetitive surge conditions per IEC 61000-4-5.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 μA at 20 V) and fast response time (<1.0 ps), critical for suppressing ESD and inductive switching spikes.
The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and exhibits a low 0.094 %/°C temperature coefficient of VBR, enabling predictable clamping behavior across thermal extremes in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering above normal operating rail |
| VC (Clamping Voltage) | 32.4 V at 12.3 A - Measured peak voltage during 10/1000 μs surge; directly limits stress on protected ICs or MOSFETs |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Sustained transient energy handling capability on standard 5.0 mm × 5.0 mm copper pads |
| IPPM (Peak Pulse Current) | 12.3 A - Maximum surge current the device safely clamps without degradation; derived from VC and PPPM |
| TJmax | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive and high-ambient industrial locations |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient; informs derating requirements for sustained power dissipation |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to ground or low-impedance return plane; completes clamping loop during transient events |
| Cathode | Reverse voltage sensing / Clamping node | Connected to protected line (e.g., 24 V rail or CAN_H); avalanches when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against severe IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V systems without derating |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification option (HE3 suffix) | Validates reliability for automotive powertrain and body electronics applications requiring zero-defect operation |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply inputs and switch sense lines from load dump and inductive kickback in vehicle BCMs. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between input rail and chassis ground to clamp transients up to ±100 V. Use Value: Limits voltage seen by MCU GPIOs and level translators to ≤32.4 V, preventing latch-up and permanent damage during ISO 7637-2 pulse 5a events. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff-connected TVS on each channel's signal line, referenced to common ground, activated only during overvoltage faults. Use Value: Maintains <1.0 μA leakage at 24 V nominal, ensuring clean logic thresholds while clamping 1 kV/42 Ω surges to safe levels per IEC 61000-4-4. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Driver Board |
|
Use Scenario: Secondary-side overvoltage suppression on 48 V telecom rectifier outputs feeding DC-DC converters. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS parallel to bulk capacitor, absorbing residual switching spikes and lightning-induced surges. Use Value: Achieves sub-nanosecond response and 32.4 V clamping, preventing overvoltage stress on downstream SiC MOSFET gate drivers and feedback optocouplers. |
Use Scenario: Protecting microcontroller I/O pins and H-bridge gate drivers from back-EMF generated by brushed DC motors in smart appliances. IC Role / Device Role / Timing Role: Localized TVS on motor control signals and power rails, mounted adjacent to connectors and driver ICs. Use Value: Withstands 40 A 8.3 ms surge current, surviving repeated motor stall events without parametric shift or failure in high-volume white goods production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU WEEE, specific OEM specs) | Choose M3/61 if halogen-free bill-of-materials is required; otherwise E3/61 offers standard commercial-grade compliance |
| SMAJ20CA-E3/61 | Bidirectional version with same VWM (20 V), VBR (22.2–24.5 V), and VC (32.4 V), but symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal or differential surges occur | Select SMAJ20CA-E3/61 only when bidirectional protection is needed; SMAJ20A-E3/61 is optimal for DC rails with defined ground reference |
Compared with SMAJ20A-M3/61, the E3/61 variant provides identical surge protection performance with standard RoHS compliance, while SMAJ20CA-E3/61 adds bidirectional clamping capability at the cost of slightly higher capacitance-making it suitable only for AC or differential signal protection, not unidirectional DC rails.
Availability
SMAJ20A-E3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and telecom power supply front-end designs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ20A-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, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments-designed to meet automotive, industrial, and telecom surge immunity standards while supporting automated SMT manufacturing.
FAQ
What is the maximum clamping voltage of the SMAJ20A-E3/61 under a 10/1000 μs surge?
The SMAJ20A-E3/61 has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 12.3 A using the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees the upper voltage limit imposed on protected circuitry during transient events, making SMAJ20A-E3/61 suitable for safeguarding 24 V systems where downstream components tolerate up to 36 V.
Is the SMAJ20A-E3/61 RoHS-compliant and lead-free compatible?
Yes, the SMAJ20A-E3/61 is RoHS-compliant and qualified for lead-free reflow soldering per J-STD-020 MSL Level 1, with a maximum peak temperature of 260 °C. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability requirements, and the device carries the "E3" suffix denoting commercial-grade RoHS compliance-ensuring full compatibility with modern SMT assembly processes without requiring special handling or baking.
Does the SMAJ20A-E3/61 have AEC-Q101 qualification?
The SMAJ20A-E3/61 itself is not AEC-Q101 qualified; however, the functionally identical SMAJ20AHE3 variant (with HE3 suffix) is fully AEC-Q101 qualified for automotive applications. The E3/61 part shares the same die, package, and electrical characteristics but is certified for commercial/industrial use. For automotive powertrain or body electronics requiring AEC-Q101, specify SMAJ20AHE3_X (where X = revision code) instead of SMAJ20A-E3/61.
What is the standoff voltage and why does it matter for SMAJ20A-E3/61 placement?
The SMAJ20A-E3/61 has a standoff voltage (VWM) of 20 V, meaning it remains in high-impedance state below this reverse voltage-allowing normal circuit operation without loading or leakage. This parameter dictates placement: it must be selected so that VWM exceeds the maximum steady-state voltage of the protected line (e.g., 24 V nominal rail requires ≥20 V VWM), ensuring the SMAJ20A-E3/61 activates only during fault conditions and avoids false triggering.
Can SMAJ20A-E3/61 replace SMAJ18A-E3/61 or SMAJ22A-E3/61 in an existing design?
SMAJ20A-E3/61 is not a direct replacement for SMAJ18A-E3/61 or SMAJ22A-E3/61 due to differences in standoff and breakdown voltages: SMAJ18A has VWM = 18 V and SMAJ22A has VWM = 22 V. Substituting SMAJ20A-E3/61 may reduce protection margin (if replacing SMAJ18A) or increase risk of nuisance conduction (if replacing SMAJ22A). Always verify VWM, VBR, and system operating margins before interchange-SMAJ20A-E3/61 is optimized specifically for 20 V rail protection.
SMAJ20A-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 12.3A
- 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)
SMAJ20A-E3/61 FAQ
1.How can I place an order for SMAJ20A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20A-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 SMAJ20A-E3/61 reliable?
The price and inventory of SMAJ20A-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 SMAJ20A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ20A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20A-E3/61?
SMAJ20A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20A-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 SMAJ20A-E3/61?
For technical support, including SMAJ20A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20A-E3/61 requirements.
6.How does Aetrix verify that SMAJ20A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ20A-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 SMAJ20A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ20A-E3/61?
All SMAJ20A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20A-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 SMAJ20A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ20A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20A-E3/61 Tags
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