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Vishay General Semiconductor - Diodes Division SMAJ20CA-M3/61
- Part No.:
- SMAJ20CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20CA-M3/61.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,225
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Product details
Overview
SMAJ20CA-M3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 20 V stand-off 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial electronics.
For engineers reviewing the SMAJ20CA-M3/61 datasheet, SMAJ20CA-M3/61 pinout, SMAJ20CA-M3/61 application, or SMAJ20CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, 32.4 V VC under 12.3 A surge, 1.0 μA max reverse leakage at 20 V, -55 °C to +150 °C operating junction temperature, and halogen-free RoHS-compliant M3 termination.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical VBR min/max (22.2–24.5 V), VC (32.4 V), and IPPM (12.3 A) specifications for positive and negative transients. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance.
It delivers 400 W peak pulse power per 10/1000 μs waveform up to 78 V; above that threshold, derated to 300 W. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on margin above VWM |
| VC @ IPPM | 32.4 V at 12.3 A - Clamped voltage during 10/1000 μs transient, limiting stress on downstream ICs |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity per standard waveform |
| ID @ VWM | 1.0 μA max - Low leakage preserves signal integrity and minimizes standby power loss |
| TJ Range | -55 °C to +150 °C - Enables use in under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0, J-STD-002 solderability, and JESD 22-B102 whisker resistance (Class 2). Bidirectional construction has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction when |V| > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 400 W peak pulse power (≤78 V) | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) on 20 V rails |
| 32.4 V clamping voltage at 12.3 A | Keeps protected ICs (e.g., 3.3 V or 5 V logic) safely below absolute maximum ratings during transients |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEM programs |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Sensor Signal Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., temperature, pressure) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or gate oxide damage in 5 V or 3.3 V sensor interface ICs while maintaining signal fidelity. |
Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against field-wiring surges and ESD events in factory automation. IC Role / Device Role / Timing Role: Parallel-connected TVS on each I/O line, referenced to common ground or supply rail. Use Value: Absorbs 400 W surge energy without degradation, enabling robust 24 V DC I/O protection compliant with IEC 61000-4-4/5. |
| Consumer Power Adapter Output | Telecom Line Interface Protection |
Use Scenario: Clamping overvoltage on secondary-side 12–24 V DC outputs of wall adapters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: TVS placed between output rail and ground, downstream of DC-DC converter. Use Value: Responds in <1 ps to clamp transients within 32.4 V, protecting downstream USB-PD controllers or PMICs rated for 28 V max. |
Use Scenario: Protecting Ethernet PHY or DSL line drivers from induced surges on twisted-pair telecom interfaces. IC Role / Device Role / Timing Role: Bidirectional TVS across differential pair or line-to-ground, meeting GR-1089-CORE requirements. Use Value: Symmetric clamping ensures equal protection for both conductors, preserving common-mode rejection while limiting differential surge to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-M3/61 | Unidirectional; cathode band marked; VF = 3.5 V at 25 A (forward conduction only) | Requires correct polarity placement; unsuitable for AC or floating lines | Select only when circuit topology guarantees unidirectional surge polarity and forward conduction is acceptable |
| SMBJ20CA-M3/61 | Same VWM/VBR/VC specs but in SMB (DO-214AA) package; 600 W PPPM rating | Larger footprint (4.6 mm × 3.6 mm vs. 4.5 mm × 2.8 mm); higher surge margin | Choose when board space allows and higher 600 W surge immunity is required without redesigning layout |
Compared with SMAJ20CA-M3/61, SMAJ20A-M3/61 requires strict polarity alignment and offers no reverse conduction path, while SMBJ20CA-M3/61 provides 50 % higher peak pulse power in a larger package-making SMAJ20CA-M3/61 optimal for compact, polarity-agnostic 400 W protection.
Availability
SMAJ20CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and consumer power adapter designs requiring stable component supply, halogen-free compliance, and MSL Level 1 reflow compatibility.
Supply support for SMAJ20CA-M3/61 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, thermal performance, and automotive qualification.
The SMAJ series targets cost-sensitive, high-volume transient suppression needs in automotive, industrial, and consumer systems where compact size, bidirectional capability, and AEC-Q101 readiness (in HE3/HM3 variants) are critical.
FAQ
What is the clamping voltage of SMAJ20CA-M3/61 under a 10/1000 μs surge?
The SMAJ20CA-M3/61 exhibits 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 ensures downstream components see limited overvoltage stress during transient events. The SMAJ20CA-M3/61 maintains this clamping performance bidirectionally across both polarities.
Is SMAJ20CA-M3/61 suitable for automotive applications?
Yes, SMAJ20CA-M3/61 is halogen-free and RoHS-compliant (M3 suffix), and the SMAJ family supports AEC-Q101 qualification in HE3/HM3 variants. While the M3/61 variant itself is commercial-grade, its -55 °C to +150 °C operating junction temperature range, 400 W surge rating, and robust glass-passivated junction make it widely deployed in non-safety-critical automotive subsystems such as body control modules and sensor interfaces. For AEC-Q101-certified use, specify SMAJ20CAHM3_X.
How does SMAJ20CA-M3/61 differ from SMAJ20A-M3/61?
SMAJ20CA-M3/61 is bidirectional with symmetrical clamping in both polarities and no polarity marking, whereas SMAJ20A-M3/61 is unidirectional with a cathode band and conducts only in reverse bias. SMAJ20A-M3/61 also specifies forward voltage (VF = 3.5 V at 25 A), which SMAJ20CA-M3/61 does not-since it lacks a defined anode/cathode. This makes SMAJ20CA-M3/61 ideal for AC or floating lines, while SMAJ20A-M3/61 suits DC rails with known polarity.
What is the thermal resistance of SMAJ20CA-M3/61?
The SMAJ20CA-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and a junction-to-lead resistance (RθJL) of 30 °C/W, measured on standard 0.2" × 0.2" copper pads per JEDEC 51-3. These values assume PCB-level heat spreading and define safe power dissipation limits: at 25 °C ambient, its 3.3 W steady-state power rating corresponds to a ~400 °C junction rise if fully thermally isolated-but real-world layouts with adequate copper reduce actual ΔT significantly. The SMAJ20CA-M3/61 relies primarily on short-duration surge handling rather than continuous power dissipation.
Does SMAJ20CA-M3/61 require special PCB layout considerations?
Yes-optimal transient suppression with SMAJ20CA-M3/61 demands low-inductance layout: place it as close as possible to the protected port, use short wide traces to minimize series inductance, and connect directly to solid ground/power planes. Avoid vias in the main current path. The device's 32.4 V clamping is only guaranteed when mounted per the recommended 0.2" × 0.2" copper pad layout; smaller pads increase clamping voltage due to thermal impedance. SMAJ20CA-M3/61 benefits from symmetric routing for bidirectional performance.
SMAJ20CA-M3/61 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-M3/61 FAQ
1.How can I place an order for SMAJ20CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20CA-M3/61 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-M3/61 reliable?
The price and inventory of SMAJ20CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ20CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20CA-M3/61?
SMAJ20CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20CA-M3/61 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-M3/61?
For technical support, including SMAJ20CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ20CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ20CA-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ20CA-M3/61?
All SMAJ20CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20CA-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ20CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20CA-M3/61 Tags
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