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Vishay General Semiconductor - Diodes Division SMAJ20CA-E3/61
- Part No.:
- SMAJ20CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20CA-E3/61.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:31,673
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Product details
Overview
SMAJ20CA-E3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 20 V standoff voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, clamps transients to ≤32.4 V at 12.3 A peak pulse current (IPPM), and delivers 400 W peak pulse power (10/1000 μs waveform) - ideal for safeguarding MOSFET gates, sensor interfaces, and automotive control circuits against ESD and inductive switching surges.
For engineers reviewing the SMAJ20CA-E3/61 datasheet, SMAJ20CA-E3/61 pinout, SMAJ20CA-E3/61 application, or SMAJ20CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping voltage under surge, AEC-Q101 qualification eligibility, SMA (DO-214AC) package compatibility with automated placement, and thermal resistance (RθJA = 120 °C/W) for board-level thermal design validation.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA suffix designation, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and fast response (<1 ns), while the unmarked SMA package reflects its bidirectional construction - no cathode band is present.
The device complies with ANSI/IEEE C62.35 surge standards and supports repetitive surge duty cycles up to 0.01 % (300 W derated above 78 V). With a maximum junction temperature of +150 °C and MSL Level 1 rating (peak reflow 260 °C), it is qualified for high-reliability industrial and automotive environments when ordered with HE3/HM3 suffixes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - guaranteed conduction onset range; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | ≤32.4 V at IPPM = 12.3 A - peak voltage seen by protected circuit during 10/1000 μs surge; critical for IC survivability |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - energy-handling capacity for single-event transients; derates to 300 W above 78 V |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - negligible standby current; avoids loading sensitive analog or low-power circuits |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive or industrial enclosures |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs PCB copper area requirements |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; connects across protected line and ground (or between differential lines) without orientation constraint |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without polarity-sensitive layout constraints |
| 400 W peak pulse power (10/1000 μs) | Withstands common IEC 61000-4-5 surge events and automotive load-dump transients without degradation |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on downstream components - critical for 3.3 V or 5 V logic interface protection |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification option | Available with HE3/HM3 suffixes for automotive applications requiring validated reliability and lifetime performance |
Applications
| Automotive Body Control Module | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in vehicle door modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN line and chassis ground to clamp ±100 V transients within 1 ns. Use Value: Prevents latch-up or gate oxide damage in 5 V tolerant MCU I/O by limiting voltage to ≤32.4 V during 400 W surges. |
Use Scenario: Shields 4–20 mA current-loop sensor outputs from field-induced surges in factory automation PLC inputs. IC Role / Device Role / Timing Role: Connected across loop terminals (line-to-line) to absorb differential-mode transients without disrupting DC bias. Use Value: Maintains signal integrity by limiting transient overshoot to <33 V while adding <1 μA leakage at 20 V operating point. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
Use Scenario: Installed on USB 2.0 D+/D− lines to meet IEC 61000-4-2 ±15 kV contact discharge requirements. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed before USB transceiver to shunt ESD current away from PHY. Use Value: Clamps sub-ns ESD pulses to safe levels while introducing minimal signal distortion due to symmetrical VBR matching. |
Use Scenario: Deployed on ADSL/VDSL line cards to suppress lightning-induced surges per ITU-T K.20/K.21 standards. IC Role / Device Role / Timing Role: Mounted line-to-ground on twisted-pair input to divert common-mode surges exceeding 1 kV. Use Value: Handles 10/1000 μs surges up to 400 W without failure, preserving line-card uptime and reducing field return rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/61 | Unidirectional version; includes cathode band marking and forward voltage drop (~3.5 V at 25 A) | Requires correct polarity placement; unsuitable for AC or differential lines without external rectification | Select only when protecting DC rails with known polarity and where forward conduction must be blocked |
| SMBJ20CA-E3/61 | Same VWM/VBR/VC specs but in SMB (DO-214AA) package - 25 % larger footprint, lower RθJA (90 °C/W) | Better thermal performance for high-duty-cycle surges; requires PCB layout change due to larger pad dimensions | Choose when sustained surge repetition or higher ambient temperatures demand improved thermal dissipation |
Compared with SMAJ20CA-E3/61, the unidirectional SMAJ20A-E3/61 adds polarity dependency but enables DC-blocking capability, while the SMBJ20CA-E3/61 trades compactness for enhanced thermal margin - making SMAJ20CA-E3/61 optimal for space-constrained bidirectional protection where 120 °C/W RθJA suffices.
Availability
SMAJ20CA-E3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer USB ports, and telecom line cards requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SMAJ20CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series targets board-level transient protection in harsh environments - engineered for fast response, repeatable clamping, and compatibility with automated SMT processes across automotive, industrial, and communications systems.
FAQ
What is the clamping voltage of SMAJ20CA-E3/61 at its rated peak pulse current?
The SMAJ20CA-E3/61 clamps to a maximum of 32.4 V when subjected to its specified peak pulse current of 12.3 A (10/1000 μs waveform). This value is measured under standardized test conditions and represents the highest voltage the protected circuit will experience during such a transient event. The clamping voltage directly determines the stress imposed on downstream components, making it a critical parameter for ensuring system-level surge immunity.
Is SMAJ20CA-E3/61 suitable for automotive applications?
SMAJ20CA-E3/61 itself is commercial-grade (RoHS-compliant E3 suffix), but Vishay offers AEC-Q101 qualified versions under ordering codes SMAJ20CAHE3_X (HE3 suffix). These variants undergo extended reliability testing including temperature cycling, humidity bias, and surge endurance - validating suitability for automotive body electronics and infotainment systems. Always verify the specific suffix matches your qualification requirements before design-in.
How does the bidirectional nature of SMAJ20CA-E3/61 affect PCB layout?
The SMAJ20CA-E3/61 has no polarity marking and identical electrical behavior in both directions, so PCB layout requires no orientation alignment - either terminal may connect to line or ground. This simplifies routing for differential signals (e.g., RS-485, CAN), AC-coupled interfaces, or floating sensors. However, thermal pad design must still follow Vishay's recommended 0.2" × 0.2" copper areas per terminal to maintain rated PPPM and RθJA performance.
What is the maximum reverse leakage current for SMAJ20CA-E3/61 at its standoff voltage?
At its 20 V standoff voltage (VWM) and TA = 25 °C, the SMAJ20CA-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA. This ultra-low leakage ensures minimal power loss and avoids unintended biasing in high-impedance circuits such as precision sensor front-ends or battery-powered IoT nodes. Leakage remains well below 5 μA even at +85 °C ambient, supporting reliable operation across industrial temperature ranges.
Can SMAJ20CA-E3/61 replace SMAJ18CA-E3/61 or SMAJ22CA-E3/61 in an existing design?
SMAJ20CA-E3/61 is not a direct replacement for SMAJ18CA-E3/61 or SMAJ22CA-E3/61 due to differences in standoff and breakdown voltages: SMAJ18CA specifies VWM = 18 V (VBR = 20.0–22.1 V), while SMAJ22CA specifies VWM = 22 V (VBR = 24.4–26.9 V). Substituting alters the protection margin - using SMAJ20CA-E3/61 where SMAJ18CA was intended risks premature clamping; using it where SMAJ22CA was intended reduces surge margin. Always validate clamping behavior under actual system transients before interchange.
SMAJ20CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ20CA-E3/61 FAQ
1.How can I place an order for SMAJ20CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20CA-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 SMAJ20CA-E3/61 reliable?
The price and inventory of SMAJ20CA-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 SMAJ20CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ20CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20CA-E3/61?
SMAJ20CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20CA-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 SMAJ20CA-E3/61?
For technical support, including SMAJ20CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ20CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ20CA-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 SMAJ20CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ20CA-E3/61?
All SMAJ20CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20CA-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 SMAJ20CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ20CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20CA-E3/61 Tags
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