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Vishay General Semiconductor - Diodes Division SMAJ20-E3/61
- Part No.:
- SMAJ20-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20-E3/61.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,388
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Product details
Overview
SMAJ20-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping transient overvoltages on power and signal lines. It features a 20 V stand-off voltage (VWM), 35.8 V maximum clamping voltage (VC) at 11.2 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ20-E3/61 datasheet, SMAJ20-E3/61 pinout, SMAJ20-E3/61 application, or SMAJ20-E3/61 equivalent, this device delivers verified clamping performance, RoHS-compliant matte tin terminations, MSL Level 1 moisture sensitivity, and J-STD-002 solderability - critical for automated SMT assembly and automotive-grade reliability validation.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping protection element across DC rails or low-speed signal paths. Its glass-passivated junction ensures stable breakdown behavior, while the 120 °C/W junction-to-ambient thermal resistance requires minimum 5.0 × 5.0 mm copper pads for full 400 W pulse handling.
The device responds to transients within picoseconds and maintains ≤1.0 µA reverse leakage at 20 V (VWM). Clamping occurs at 35.8 V under 11.2 A surge (10/1000 µs), with incremental surge resistance low enough to limit energy dissipation during repetitive ESD or load-switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin below clamping threshold. |
| VC @ IPPM | 35.8 V - Clamped voltage seen by protected circuit during 11.2 A transient; determines maximum stress on downstream components. |
| IPPM | 11.2 A - Peak surge current capability with 10/1000 µs waveform; defines transient energy absorption capacity (400 W). |
| IR @ VWM | ≤1.0 µA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ Range | –55 °C to +150 °C - Operating and storage junction temperature range; supports deployment in under-hood automotive and industrial environments. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with JEDEC MS-013 and IPC-7351B footprint. |
| Moisture Sensitivity | MSL Level 1 - No floor life limitation; may be stored indefinitely at ≤30 °C/60% RH without baking prior to reflow. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with two coplanar leads; cathode indicated by a single band on one end. Leads are matte tin-plated, solderable per J-STD-002 and JESD22-B102. Mounting requires 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal for full power rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point for unidirectional clamping | Connected to ground or lower-potential rail; conducts surge current toward reference when cathode voltage exceeds VBR. |
| Cathode (banded end) | High-side connection point for unidirectional clamping | Connected to protected line (e.g., 24 V supply or CAN_H); initiates avalanche breakdown when transient exceeds VBR (22.2–27.1 V). |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 24 V systems without derating. |
| Glass-passivated junction | Ensures stable VBR tolerance (±10 %) and long-term reliability under thermal cycling and humidity exposure. |
| Low clamping ratio (VC/VWM = 1.79) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in MOSFETs and ICs. |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets EU Directive 2002/95/EC; qualified for consumer, industrial, and telecom applications with JESD201 Class 1A whisker resistance. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free reflow profiles without preconditioning; eliminates production delays from moisture-sensitive handling. |
Applications
| Industrial Power Input Protection | Automotive Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 24 V DC input stage of PLC I/O module exposed to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +24 V rail and chassis ground to clamp switching transients before they reach DC-DC converter input. Use Value: Limits transient voltage to ≤35.8 V, preventing overvoltage failure of 40 V-rated input capacitors and enabling compliance with IEC 61000-4-4 electrical fast transient immunity. |
Use Scenario: LIN bus line in engine control unit subject to battery dump and load-dump transients. IC Role / Device Role / Timing Role: TVS connected between LIN signal line and ground to suppress ±100 V/50 ms load-dump pulses per ISO 7637-2 Pulse 5a. Use Value: Absorbs up to 400 W for 1 ms, maintaining signal integrity below LIN physical layer's 40 V absolute maximum rating. |
| Consumer Equipment AC/DC Adapter Output | Telecom Ethernet Port Surge Protection |
|
Use Scenario: Secondary-side 12 V output of wall adapter powering USB hub controller. IC Role / Device Role / Timing Role: Unidirectional clamping device installed between regulated 12 V and GND to protect USB PHY and voltage supervisor ICs. Use Value: Withstands 11.2 A surge current while holding clamped voltage at 35.8 V - well below 42 V absolute max rating of common USB power switches. |
Use Scenario: Low-speed management interface (e.g., MDIO/MDC) on network switch PCB. IC Role / Device Role / Timing Role: Discrete TVS on each signal line referenced to local ground plane to suppress ESD and lightning-induced surges. Use Value: 1.0 µA leakage at 20 V preserves signal rise time and prevents false triggering in 10/100 Mbps PHY receivers. |
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-E3/61 | Bidirectional variant; symmetric clamping in both polarities; VBR min/max = 22.2 V / 24.5 V; same VC = 32.4 V @ 12.3 A. | Required where AC-coupled or bidirectional signal lines (e.g., RS-485, CAN) need protection without polarity assumptions. | Select SMAJ20A-E3/61 only if circuit lacks defined DC bias or experiences reversible transients - not a drop-in replacement for unidirectional use. |
| SMCJ20A-E3/61 | Higher-power SMC (DO-214AB) package; 1500 W rating; VC = 32.4 V @ 46.7 A; same VWM = 20 V. | Suitable for higher-energy threats (e.g., IEC 61000-4-5 Level 4) where PCB space allows larger footprint and thermal mass. | Choose SMCJ20A-E3/61 when surge threat level exceeds 400 W or when system-level testing reveals insufficient margin with SMAJ20-E3/61. |
Compared with SMAJ20A-E3/61, the SMAJ20-E3/61 offers polarity-specific clamping with identical VWM but asymmetric response - advantageous for DC rails. Versus SMCJ20A-E3/61, it trades peak power for compactness and lower thermal mass, making it optimal for space-constrained 24 V industrial modules where 400 W suffices.
Availability
SMAJ20-E3/61 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, consumer adapter outputs, and telecom management port protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ20-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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, precision, and application-specific performance.
The SMAJ series targets board-level transient protection in cost-sensitive, high-volume applications - optimized for automated SMT assembly, wide temperature operation, and compliance with global environmental directives.
FAQ
What is the breakdown voltage range for SMAJ20-E3/61?
The SMAJ20-E3/61 has a guaranteed breakdown voltage (VBR) range of 22.2 V to 27.1 V at 1.0 mA test current, per Vishay Document 88390. This 10 % tolerance ensures predictable clamping onset while allowing design margin above the 20 V stand-off voltage. The SMAJ20-E3/61 achieves this specification using a glass-passivated silicon junction for stability across temperature and lifetime.
Is SMAJ20-E3/61 suitable for automotive applications?
The SMAJ20-E3/61 is rated for –55 °C to +150 °C operating junction temperature and meets RoHS and MSL Level 1 requirements, making it suitable for under-dash and engine bay applications. However, for AEC-Q101 qualification, the HE3-suffix variant (e.g., SMAJ20HE3/61) must be selected - the SMAJ20-E3/61 is commercial-grade and not AEC-Q101 certified.
How does the clamping voltage of SMAJ20-E3/61 compare to its stand-off voltage?
The SMAJ20-E3/61 clamps at 35.8 V when subjected to its rated 11.2 A peak pulse current (10/1000 µs), yielding a clamping ratio (VC/VWM) of 1.79. This ratio reflects low incremental surge resistance and ensures protected ICs see less than twice the nominal rail voltage during worst-case transients - critical for safeguarding 36 V-tolerant components.
What is the maximum reverse leakage current for SMAJ20-E3/61 at rated VWM?
At 20 V reverse bias and 25 °C, the SMAJ20-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage preserves signal integrity on high-impedance nodes and minimizes standby power loss in battery-backed systems - confirmed in Vishay's Electrical Characteristics table for all SMAJ20 variants.
Can SMAJ20-E3/61 be used in bidirectional signal protection?
No - the SMAJ20-E3/61 is unidirectional and conducts only when cathode voltage exceeds anode by ≥VBR. For bidirectional protection (e.g., RS-485, CAN, or AC-coupled lines), the SMAJ20A-E3/61 variant must be used. Using SMAJ20-E3/61 on bidirectional signals risks forward conduction during negative transients, potentially damaging upstream drivers or violating signal thresholds.
SMAJ20-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- 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)
SMAJ20-E3/61 FAQ
1.How can I place an order for SMAJ20-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20-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 SMAJ20-E3/61 reliable?
The price and inventory of SMAJ20-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 SMAJ20-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ20-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20-E3/61?
SMAJ20-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20-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 SMAJ20-E3/61?
For technical support, including SMAJ20-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20-E3/61 requirements.
6.How does Aetrix verify that SMAJ20-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ20-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 SMAJ20-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ20-E3/61?
All SMAJ20-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20-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 SMAJ20-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ20-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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