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Vishay General Semiconductor - Diodes Division SMAJ64A-M3/61
- Part No.:
- SMAJ64A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64A-M3/61.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,551
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Product details
Overview
SMAJ64A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 64 V stand-off voltage (VWM), 71.1–78.6 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤103 V at 3.9 A peak pulse current (IPPM), with 400 W peak pulse power rating (10/1000 μs waveform). It is used to protect MOSFETs, ICs, and sensor signal lines in industrial power supplies and automotive ECUs.
For engineers reviewing the SMAJ64A-M3/61 datasheet, SMAJ64A-M3/61 pinout, SMAJ64A-M3/61 application, or SMAJ64A-M3/61 equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1 μA leakage at 64 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and fast response time (<1 ns).
The SMAJ64A-M3/61 is rated for repetitive surge duty cycle ≤0.01 %, derated above 25 °C ambient per Fig. 2, and requires minimum 0.2" × 0.2" copper pads per terminal for full 400 W rating. It meets MSL Level 1 (JEDEC J-STD-020) and supports reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of safe DC/AC bias range. |
| VBR min/max | 71.1 V / 78.6 V at 1 mA - Confirmed breakdown window ensuring reliable triggering without premature conduction. |
| VC @ IPPM | ≤103 V at 3.9 A - Clamping voltage during 10/1000 μs surge; must be below protected IC's absolute max input rating. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy absorption capability; derates to 300 W above 78 V per spec. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at rated stand-off; ensures minimal power loss and signal integrity in standby. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard PCB pad; determines max allowable power dissipation at given ambient. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward current until breakdown, conducts only in reverse surge direction. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge return path | Connected to system ground or low-impedance reference; carries full transient current during clamping event. |
| Anode | Protected line connection | Connected to I/O line or power rail requiring protection; voltage at this node is clamped to ≤103 V during surge. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against severe inductive switching surges (e.g., relay coil flyback, motor commutation) without failure. |
| Low clamping ratio (VC/VBR ≈ 1.30) | Minimizes overvoltage stress on downstream components-critical for 65 V-rated MOSFETs or 75 V-input regulators. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing logistics. |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for industrial and automotive end equipment without sacrificing performance. |
| 150 °C max junction temperature | Supports operation in under-hood automotive or enclosed industrial enclosures with elevated ambient temperatures. |
Applications
| Industrial Power Supply Protection | Automotive ECU Signal Line Protection |
|---|---|
Use Scenario: Protecting 60 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive kickback. IC Role / Device Role / Timing Role: Shunt TVS diode placed between input rail and chassis ground, triggered within nanoseconds upon overvoltage event. Use Value: Limits transient voltage to ≤103 V, preventing damage to upstream DC-DC controllers rated for 100 V absolute max input. |
Use Scenario: Safeguarding CAN transceiver data lines (CAN_H/CAN_L) in engine control units exposed to ISO 7637-2 Pulse 1/2a/5a. IC Role / Device Role / Timing Role: Unidirectional clamp on each line referenced to vehicle ground; suppresses negative-going spikes while preserving signal integrity. Use Value: With <1 μA leakage at 12 V nominal, avoids loading the differential bus; clamps to <103 V during 100 V/50 ms load dump events. |
| Consumer Sensor Interface Protection | Telecom DC Feeding Port Protection |
Use Scenario: Shielding analog output pins of MEMS pressure sensors in HVAC systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF at 0 V) placed directly at connector entry point before signal conditioning amplifier. Use Value: Sub-ns response preserves millivolt-level sensor accuracy; 64 V VWM avoids interference with 24 V supply-sensed outputs. |
Use Scenario: Protecting 48 V PoE (Power over Ethernet) feeding ports in network switches from lightning-induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: Primary shunt protector on DC feed line, coordinated with upstream GDT or MOV for staged clamping. Use Value: 400 W rating handles high-energy common-mode surges; unidirectional configuration prevents interference with DC bias on active Ethernet pairs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A-E3/61 | Same electrical specs and package, but RoHS-compliant commercial grade without halogen-free certification (E3 vs. M3). | Acceptable where halogen-free material compliance is not mandated by customer or regional regulation. | Select SMAJ64A-E3/61 for cost-sensitive industrial designs without halogen restrictions. |
| SMAJ64CA-M3/61 | Bidirectional variant: symmetric breakdown (±71.1–78.6 V), no polarity marking, same VWM (64 V) and VC (103 V). | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, audio), not suitable for DC-biased unidirectional rails. | Choose SMAJ64CA-M3/61 only when protecting balanced or alternating-voltage interfaces. |
Compared with SMAJ64A-E3/61, the M3 suffix adds halogen-free assurance without electrical trade-offs; versus SMAJ64CA-M3/61, the unidirectional SMAJ64A-M3/61 provides lower leakage and avoids unnecessary bidirectional conduction in DC systems.
Availability
SMAJ64A-M3/61 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, and telecom infrastructure requiring stable component supply with halogen-free compliance and MSL Level 1 handling.
Supply support for SMAJ64A-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, power efficiency, and automotive qualification.
The SMAJ series is engineered for high-energy transient suppression in harsh environments-designed to meet AEC-Q101 requirements and deliver consistent clamping performance across temperature and lifetime.
FAQ
What is the maximum clamping voltage of the SMAJ64A-M3/61 under surge conditions?
The SMAJ64A-M3/61 has a maximum clamping voltage (VC) of 103 V at its rated peak pulse current (IPPM) of 3.9 A, tested with a 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ64A-M3/61 maintains this clamping performance due to its low incremental surge resistance and stable silicon junction.
Does the SMAJ64A-M3/61 meet automotive qualification standards?
The SMAJ64A-M3/61 itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMAJ64A-HM3_X variant (e.g., SMAJ64A-HM3_A) which carries AEC-Q101 qualification. The SMAJ64A-M3/61 shares the same electrical characteristics, package, and thermal behavior-but lacks the extended reliability testing required for automotive under-hood use. Always verify qualification status via the full part number suffix.
How does the M3 suffix affect the SMAJ64A-M3/61 compared to other variants?
The M3 suffix on SMAJ64A-M3/61 indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. Unlike E3-suffixed versions, M3 ensures compliance with strict environmental regulations such as IEC 61249-2-21. The SMAJ64A-M3/61 delivers identical electrical performance and packaging dimensions-only material content differs.
Can the SMAJ64A-M3/61 be used in bidirectional signal protection?
No-the SMAJ64A-M3/61 is strictly unidirectional and features a cathode band marking; it conducts only in reverse bias and blocks forward current. For bidirectional protection (e.g., RS-485, AC lines), the SMAJ64CA-M3/61 variant must be used. Using SMAJ64A-M3/61 on bidirectional signals risks forward conduction, excessive leakage, or failure to clamp negative transients.
What PCB layout guidance applies to the SMAJ64A-M3/61 for full 400 W rating?
To achieve the full 400 W peak pulse power rating, the SMAJ64A-M3/61 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Smaller pads reduce thermal dissipation and cause premature thermal runaway during repeated surges. The SMAJ64A-M3/61 also requires short, low-inductance traces to ground to preserve nanosecond response time.
SMAJ64A-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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- 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)
SMAJ64A-M3/61 FAQ
1.How can I place an order for SMAJ64A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64A-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 SMAJ64A-M3/61 reliable?
The price and inventory of SMAJ64A-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 SMAJ64A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ64A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64A-M3/61?
SMAJ64A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64A-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 SMAJ64A-M3/61?
For technical support, including SMAJ64A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64A-M3/61 requirements.
6.How does Aetrix verify that SMAJ64A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ64A-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 SMAJ64A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ64A-M3/61?
All SMAJ64A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64A-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 SMAJ64A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ64A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ64A-M3/61 Tags
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