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Vishay General Semiconductor - Diodes Division SMAJ40CA-M3/61
- Part No.:
- SMAJ40CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CA-M3/61.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ40CA-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 power and signal lines. It features 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 6.2 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), protecting MOSFETs and ICs in automotive and industrial power supplies.
For engineers reviewing the SMAJ40CA-M3/61 datasheet, SMAJ40CA-M3/61 pinout, SMAJ40CA-M3/61 application, or SMAJ40CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, 64.5 V VC under 6.2 A surge, 1.0 μA max reverse leakage at 40 V, -55 °C to +150 °C operating junction temperature, and halogen-free RoHS-compliant M3 termination.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, critical for consistent clamping across repetitive transients.
The device delivers 400 W peak pulse power handling up to 78 V, derating to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. It meets J-STD-020 MSL Level 1 and is qualified to AEC-Q101 when ordered with HE3/HM3 suffixes - though SMAJ40CA-M3/61 itself is commercial-grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC RMS working limit. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 64.5 V at 6.2 A - Clamped voltage seen by protected circuit during full-rated 10/1000 μs transient; limits stress on downstream components. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy absorption capacity per single 10/1000 μs pulse; determines survivability against lightning or inductive spikes. |
| ID @ VWM | 1.0 μA max - Ultra-low reverse leakage at rated standoff, minimizing standby power loss and signal distortion. |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" length, compatible with automated placement and reflow soldering. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of symmetrical PN junction; forms bidirectional conduction path with Cathode terminal. |
| Cathode | Terminal K | Other side of symmetrical PN junction; functionally identical to Anode in CA devices - no cathode band marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating nodes without external polarity management or dual-device implementation. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as ISO 7637-2 Pulse 1/2a/5a in automotive electronics and IEC 61000-4-5 surges in industrial controls. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during clamping - critical for safeguarding 3.3 V or 5 V logic interfaces and gate drivers. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, reducing manufacturing complexity and cost. |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for global electronics markets including EU, China, and Japan without performance trade-offs. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs and body control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input rails to clamp ±100 V transients within 1 ns response time. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during ISO 16750-2 tests. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation. IC Role / Device Role / Timing Role: Low-leakage TVS connected between signal line and ground to suppress ESD and EFT bursts per IEC 61000-4-2/4. Use Value: Maintains signal integrity with <1.0 μA leakage at 40 V, avoiding offset errors in precision measurement circuits. |
| Consumer USB Port Protection | Telecom DSL Line Interface |
|
Use Scenario: Safeguarding USB 2.0 data lines (D+/D−) and VBUS against human-body-model ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS placed differentially across D+/D− and common-mode across VBUS/GND. Use Value: Achieves >15 kV air-gap ESD immunity while adding <0.5 pF parasitic capacitance - preserving signal rise time. |
Use Scenario: Front-end surge suppression on ADSL/VDSL line cards exposed to lightning-induced surges on twisted-pair copper. IC Role / Device Role / Timing Role: High-power TVS mounted at line entry point to divert >10 A surges before reaching transformer and codec ICs. Use Value: Sustains 400 W peak pulse power without degradation, meeting GR-1089-CORE Level 3 telecom surge requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3 termination). | Preferred for non-automotive commercial designs where halogen-free requirement is not mandated. | Select E3 for cost-sensitive consumer applications; M3 required for automotive Tier 1 or green procurement policies. |
| SMBJ40CA-M3 | Same VWM/VC/PPPM but in larger SMB (DO-214AA) package; 100 W higher surge rating margin due to improved thermal mass. | Better suited for high-reliability industrial systems requiring extended surge endurance or higher ambient temperatures. | Choose SMBJ40CA-M3 when board space allows and thermal derating headroom is needed beyond SMAJ40CA-M3/61's 120 °C/W RθJA. |
Compared with SMAJ40CA-E3/61, the M3 variant adds halogen-free compliance without altering clamping performance; versus SMBJ40CA-M3, SMAJ40CA-M3/61 trades ~15 % lower surge margin for 30 % smaller PCB footprint and compatibility with fine-pitch automated assembly.
Availability
SMAJ40CA-M3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, consumer USB protection, and telecom DSL line protection requiring stable component supply and halogen-free compliance.
Supply support for SMAJ40CA-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 targets cost-effective, high-volume transient suppression in automotive, industrial, and consumer electronics - delivering standardized TVS performance in compact surface-mount packages with rigorous qualification and traceability.
FAQ
What is the clamping voltage of SMAJ40CA-M3/61 at its rated peak pulse current?
The SMAJ40CA-M3/61 has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value ensures downstream components like 75 V-rated MOSFETs or 5 V microcontrollers remain within safe operating limits during surge events. The clamping behavior is symmetrical in both directions due to its bidirectional CA construction.
Is SMAJ40CA-M3/61 suitable for automotive applications?
SMAJ40CA-M3/61 is qualified for commercial-grade use and meets RoHS and halogen-free requirements, but it is not AEC-Q101 certified. For automotive applications requiring qualification, Vishay offers the SMAJ40CA-HM3_X variant (e.g., SMAJ40CA-HM3_A). Engineers must select HM3 or HE3 suffixes for AEC-Q101 compliance; SMAJ40CA-M3/61 remains appropriate for non-safety-critical aftermarket or infotainment subsystems.
How does the bidirectional design of SMAJ40CA-M3/61 affect its PCB layout?
The bidirectional SMAJ40CA-M3/61 has no polarity marking - unlike unidirectional variants - so orientation on the PCB is irrelevant. This simplifies layout, eliminates risk of reverse installation, and supports symmetric placement across differential lines or AC-coupled paths. The SMA (DO-214AC) package uses standard 0.2" × 0.2" copper pads per terminal, matching IPC-7351B recommendations for thermal and mechanical reliability.
What is the maximum reverse leakage current for SMAJ40CA-M3/61 at its standoff voltage?
At its 40 V standoff voltage (VWM), the SMAJ40CA-M3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C. This ultra-low leakage preserves signal fidelity in high-impedance sensor interfaces and minimizes quiescent power draw in battery-operated systems. Leakage increases with temperature but remains below 10 μA up to 85 °C per Vishay's characterization data.
Does SMAJ40CA-M3/61 require special handling during reflow soldering?
No - SMAJ40CA-M3/61 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and withstands standard lead-free reflow profiles (peak 260 °C) without preconditioning or baking. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, ensuring robust solderability and whisker resistance per JESD 201 Class 2.
SMAJ40CA-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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)
SMAJ40CA-M3/61 FAQ
1.How can I place an order for SMAJ40CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CA-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 SMAJ40CA-M3/61 reliable?
The price and inventory of SMAJ40CA-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 SMAJ40CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ40CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CA-M3/61?
SMAJ40CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CA-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 SMAJ40CA-M3/61?
For technical support, including SMAJ40CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ40CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ40CA-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 SMAJ40CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ40CA-M3/61?
All SMAJ40CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CA-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 SMAJ40CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ40CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40CA-M3/61 Tags
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