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Vishay General Semiconductor - Diodes Division SMAJ20A-M3/61
- Part No.:
- SMAJ20A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20A-M3/61.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,003
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Product details
Overview
SMAJ20A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal 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 interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ20A-M3/61 datasheet, SMAJ20A-M3/61 pinout, SMAJ20A-M3/61 application, or SMAJ20A-M3/61 equivalent, key selection criteria include unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification eligibility via HM3 variant - all critical for board-level ESD and surge protection design.
Technical Context
This TVS diode operates as a fast-acting shunt clamp, entering avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping performance under repetitive 10/1000 μs transients at 0.01% duty cycle.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W. It meets MSL Level 1 per J-STD-020 and supports automated SMT placement due to its low-profile SMA package and matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC signal line operating margin. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 32.4 V at 12.3 A - Clamping voltage under 10/1000 μs surge; limits downstream IC stress to safe levels during transient suppression. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω). |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; negligible power loss and signal integrity impact in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating enables use in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with JEDEC MS-013 footprints. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to circuit ground or lower-potential rail; forms return path during clamping. |
| Cathode | Reverse voltage sensing / clamping node | Connected to protected line (e.g., 20 V supply rail); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against severe lightning-induced surges per IEC 61000-4-5, eliminating need for cascaded protection stages. |
| 32.4 V clamping voltage at 12.3 A | Keeps protected 24 V system nodes below 33 V during surge, ensuring compatibility with 36 V-rated ICs and gate drivers. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU environmental mandates without compromising surge robustness. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking or special handling, reducing manufacturing overhead. |
| Low 120 °C/W RθJA (on 5 mm × 5 mm pads) | Allows thermal management with minimal PCB copper area, simplifying layout in space-constrained motor control and sensor modules. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC input rails in variable-frequency drives against inductive switching spikes from contactor coils and relay back-EMF. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between rail and ground, clamping transients within 1 ns to prevent latch-up in MCU power supervisors and gate drivers. Use Value: Limits rail overshoot to ≤32.4 V during 100 A/μs dI/dt events, preserving 36 V-rated power management ICs and avoiding system resets. |
Use Scenario: Surge suppression on LIN bus lines and power inputs of door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 12 V supply and bidirectional data lines, absorbing 400 W pulses while maintaining signal integrity. Use Value: Withstands ISO 7637-2 Pulse 5a (load dump up to 60 V, 400 ms) and Pulse 1 (inductive spike), extending ECU field life beyond 15 years. |
| Consumer Power Adapters | Industrial Sensor Signal Conditioning |
|
Use Scenario: Input-stage protection in universal-input AC/DC adapters against AC line surges and capacitor discharge transients. IC Role / Device Role / Timing Role: Primary-side unidirectional TVS across bulk capacitor terminals, diverting energy before it reaches PWM controllers and optocouplers. Use Value: Prevents catastrophic failure of 650 V MOSFETs and feedback optos by clamping 1.2 kV/500 A surges to <33 V, meeting UL 62368-1 transient immunity. |
Use Scenario: Protection of analog front-end inputs (e.g., 4–20 mA loops, thermocouple amplifiers) in PLC I/O modules from ESD and cable-coupled noise. IC Role / Device Role / Timing Role: Low-leakage (1 μA) TVS placed directly at connector pins, guarding precision op-amps and ADC references from ±8 kV HBM ESD. Use Value: Maintains <0.01% gain error in 24-bit sigma-delta ADCs by limiting transient-induced offset shift to <1 LSB during 15 kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/61 | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification; no AEC-Q101 path. | Approved for consumer and industrial non-automotive use; not qualified for automotive under hood or chassis locations. | Select when halogen-free requirement is absent and cost sensitivity outweighs automotive qualification needs. |
| SMAJ20AHM3_A/H | AEC-Q101 qualified, halogen-free, same SMA package; identical VWM/VBR/VC/PPPM, but with extended reliability testing and traceable lot control. | Required for automotive OEM BOMs where PPAP submission and zero-defect field performance are mandated. | Choose for Tier 1 automotive programs needing documented qualification evidence and long-term supply continuity. |
Compared with SMAJ20A-M3/61, the E3 variant offers baseline compliance at lower cost but lacks halogen-free assurance, while the HM3_A/H delivers full automotive qualification - making SMAJ20A-M3/61 the optimal balance of environmental compliance, surge robustness, and broad industrial applicability.
Availability
SMAJ20A-M3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, consumer power adapters, and industrial sensor signal conditioning requiring stable component supply, halogen-free compliance, and repeatable surge suppression performance.
Supply support for SMAJ20A-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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against lightning, ESD, and inductive switching is mission-critical.
FAQ
What is the maximum clamping voltage of the SMAJ20A-M3/61 under a 10/1000 μs surge?
The SMAJ20A-M3/61 has a maximum clamping voltage (VC) of 32.4 V at 12.3 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuits during standardized surge events. The SMAJ20A-M3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMAJ20A-M3/61 halogen-free and RoHS-compliant?
Yes, the SMAJ20A-M3/61 is both halogen-free and RoHS-compliant, as confirmed by its "M3" suffix per Vishay's ordering nomenclature. The M3 designation specifies halogen-free molding compound and matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. This compliance is documented in Vishay's mechanical data section and aligns with IPC-1752A material declarations. The SMAJ20A-M3/61 satisfies EU RoHS Directive 2011/65/EU and IEC 61249-2-21 requirements without exemptions.
Does the SMAJ20A-M3/61 have AEC-Q101 qualification?
The SMAJ20A-M3/61 itself is not AEC-Q101 qualified; however, Vishay offers the functionally identical SMAJ20AHM3_A/H variant with full AEC-Q101 qualification. The M3 suffix denotes halogen-free RoHS compliance only, whereas HM3 indicates both halogen-free compliance and AEC-Q101 qualification. For automotive applications requiring PPAP documentation and stress-test validation, the HM3 variant must be selected - the SMAJ20A-M3/61 remains suitable for industrial and commercial designs where AEC-Q101 is not mandated.
What is the thermal resistance of the SMAJ20A-M3/61, and how does it affect PCB layout?
The SMAJ20A-M3/61 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 JEDEC MS-013 footprint and no additional heatsinking. To maintain TJ ≤ 150 °C under 3.3 W steady-state dissipation, designers must ensure adequate copper area and airflow - undersizing pads increases thermal impedance and risks premature thermal runaway during repetitive surges. The SMAJ20A-M3/61's RθJL of 30 °C/W further supports localized heat transfer to PCB traces.
How does the SMAJ20A-M3/61 differ from bidirectional TVS diodes like SMAJ20CA?
The SMAJ20A-M3/61 is unidirectional and features a cathode band marking, allowing it to conduct forward current up to 40 A (IFSM) while clamping reverse transients above 22.2 V. In contrast, SMAJ20CA is bidirectional with symmetrical clamping in both directions and no polarity marking. The SMAJ20A-M3/61 is preferred for DC power rail protection (e.g., 20 V supplies), whereas SMAJ20CA suits AC-coupled or differential signal lines. Their VWM, VBR, and VC values differ: SMAJ20A-M3/61 has VWM = 20 V, while SMAJ20CA has VWM = 17.1 V - a key distinction affecting system voltage margin design.
SMAJ20A-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:
- 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-M3/61 FAQ
1.How can I place an order for SMAJ20A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20A-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 SMAJ20A-M3/61 reliable?
The price and inventory of SMAJ20A-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 SMAJ20A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ20A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20A-M3/61?
SMAJ20A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20A-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 SMAJ20A-M3/61?
For technical support, including SMAJ20A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20A-M3/61 requirements.
6.How does Aetrix verify that SMAJ20A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ20A-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 SMAJ20A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ20A-M3/61?
All SMAJ20A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20A-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 SMAJ20A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ20A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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