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Vishay General Semiconductor - Diodes Division SMAJ64A-M3/5A
- Part No.:
- SMAJ64A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64A-M3/5A.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,989
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Product details
Overview
SMAJ64A-M3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 64 V stand-off voltage (VWM), 71.1–78.6 V breakdown voltage (VBR) at 1 mA, 103 V maximum clamping voltage (VC) at 3.9 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is widely deployed to protect MOSFET gate drivers and automotive sensor interfaces against ESD and load dump transients.
For engineers reviewing the SMAJ64A-M3/5A datasheet, SMAJ64A-M3/5A pinout, SMAJ64A-M3/5A application, or SMAJ64A-M3/5A equivalent, key selection considerations include its unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, halogen-free RoHS-compliant construction (M3 suffix), and AEC-Q101 qualification eligibility via HM3 variant.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 64 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, clamping the protected node to ≤103 V. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns).
Rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), it supports industrial and automotive environments with -55 °C to +150 °C operating junction temperature range and meets MSL Level 1 reflow profile (260 °C peak). The SMA package enables automated placement and provides UL 94 V-0 flammability compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse working voltage before leakage exceeds 1 μA; defines safe DC rail operating margin. |
| VBR (min/max) | 71.1 V / 78.6 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 103 V at 3.9 A - Clamped voltage during 10/1000 μs transient; determines maximum stress on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); sufficient for ISO 7637-2 Pulse 1/2a/5a automotive transients. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount package with cathode band marking; compatible with standard SMT reflow and pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 compliant. Cathode indicated by black band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes shunt path during overvoltage event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 64 V rail or signal trace); defines unidirectional conduction direction. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Withstands automotive load-dump and inductive switching surges without degradation. |
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime; eliminates parameter drift in harsh environments. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets global environmental compliance requirements including JEDEC J-STD-20 and JESD201 Class 2 whisker resistance. |
| Fast response time (<1 ns) | Clamps transients before sensitive downstream components (e.g., microcontrollers, CAN transceivers) experience overstress. |
| AEC-Q101 qualification path | HM3 variant available for automotive applications requiring validated reliability per stress test standards. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 64 V battery-fed control modules (e.g., body ECUs, lighting drivers) against ISO 7637-2 Pulse 5a load dump transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp voltage spikes to ≤103 V. Use Value: Prevents permanent damage to 65 V-rated DC-DC converters and microcontrollers by limiting transient overvoltage within safe operating area. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops, 0–10 V sensors) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and return paths to absorb ESD and field-induced surges. Use Value: Maintains signal integrity and prevents latch-up in precision op-amps and ADC front-ends during electrostatic discharge events. |
| Telecom DC Power Input Protection | MOSFET Gate Driver Protection |
|
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges and hot-swap transients in central office equipment. IC Role / Device Role / Timing Role: Unidirectional TVS installed between input rail and ground to clamp negative-going transients up to 400 W. Use Value: Enables compliance with ITU-T K.20/21 immunity requirements while preserving long-term reliability of upstream rectifiers. |
Use Scenario: Shielding high-side N-channel MOSFET gate drivers in motor control inverters from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: TVS placed between gate and source to clamp dv/dt-induced overshoot exceeding gate oxide rating. Use Value: Extends MOSFET lifetime by preventing gate oxide breakdown during high-frequency PWM commutation. |
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-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for commercial-grade industrial designs where halogen content is unrestricted. | Select E3 for cost-sensitive non-automotive applications; verify halogen restrictions in final BOM. |
| SMAJ64CA-M3/5A | Bidirectional version; symmetric VBR (71.1–78.6 V) in both polarities; same VC and PPPM. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) where reverse transients occur. | Choose CA only if bidirectional protection is mandated; unidirectional SMAJ64A-M3/5A offers lower leakage in DC systems. |
Compared with SMAJ64A-E3/5A, the M3 variant adds halogen-free compliance without performance trade-offs; versus SMAJ64CA-M3/5A, the unidirectional version delivers tighter leakage control for DC power rail use but cannot suppress negative transients.
Availability
SMAJ64A-M3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supply designs requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMAJ64A-M3/5A 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 is engineered for high-energy transient suppression in demanding environments-designed to meet automotive, industrial, and telecom surge immunity standards while supporting automated manufacturing and long-term supply stability.
FAQ
What is the maximum clamping voltage of the SMAJ64A-M3/5A under a 10/1000 μs transient?
The SMAJ64A-M3/5A has a maximum clamping voltage (VC) of 103 V at 3.9 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. Designers must ensure downstream components tolerate this clamped level.
Is the SMAJ64A-M3/5A suitable for automotive applications?
The SMAJ64A-M3/5A itself is commercial-grade, but Vishay offers the HM3 variant (e.g., SMAJ64A-HM3/5A) that is AEC-Q101 qualified. The M3 suffix confirms halogen-free, RoHS-compliant construction-meeting automotive material requirements-though full qualification requires the HM3 ordering code. Always verify qualification status using the full part number.
How does the SMAJ64A-M3/5A differ from the SMAJ64CA-M3/5A?
The SMAJ64A-M3/5A is unidirectional (cathode-banded), suppressing only positive transients relative to ground, while the SMAJ64CA-M3/5A is bidirectional with symmetrical clamping in both polarities. Both share identical VBR, VC, and PPPM, but the CA version exhibits higher reverse leakage at VWM and is used for AC or differential signal protection like CAN or RS-485.
What is the thermal resistance of the SMAJ64A-M3/5A, and how does it affect layout?
The SMAJ64A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes minimal PCB copper; increasing pad size or adding thermal vias reduces RθJA. For sustained surge duty cycles, derate power based on ambient temperature using Fig. 2 in the Vishay datasheet.
Does the SMAJ64A-M3/5A require a heatsink for standard surge protection?
No external heatsink is required for single-event transient suppression-the SMAJ64A-M3/5A is rated for 400 W peak pulse power (10/1000 μs) with no heatsink, provided the PCB uses minimum recommended copper pads (0.2" × 0.2"). However, for repetitive surges or elevated ambient temperatures, thermal design must follow Vishay's derating curves (Fig. 2) to avoid exceeding 150 °C junction temperature.
SMAJ64A-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ64A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64A-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ64A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ64A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64A-M3/5A?
SMAJ64A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64A-M3/5A 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-M3/5A?
For technical support, including SMAJ64A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64A-M3/5A requirements.
6.How does Aetrix verify that SMAJ64A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ64A-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ64A-M3/5A?
All SMAJ64A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64A-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ64A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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