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Vishay General Semiconductor - Diodes Division SMAJ64AHE3/61
- Part No.:
- SMAJ64AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64AHE3/61.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,766
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Product details
Overview
SMAJ64AHE3/61 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 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 with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ64AHE3/61 datasheet, SMAJ64AHE3/61 pinout, SMAJ64AHE3/61 application, or SMAJ64AHE3/61 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 64 V), then avalanches within <1 ns when transient voltage exceeds VBR, clamping the line to ≤103 V while diverting up to 3.9 A of surge current. Its glass-passivated junction ensures stable breakdown and long-term reliability under repetitive surges.
The device is rated for 400 W peak pulse power (derated to 300 W above 78 V), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling operation up to 150 °C junction temperature. Polarity is marked by cathode band; anode/cathode terminals are defined per DO-214AC mechanical outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before significant leakage begins; sets safe DC rail margin. |
| VBR min/max | 71.1 V / 78.6 V at 1 mA - Confirmed breakdown range defining turn-on threshold under standardized test current. |
| VC @ IPPM | 103 V at 3.9 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum overvoltage exposure. |
| PPPM | 400 W - Peak pulse power handling capability; defines energy absorption limit for standard lightning/surge waveforms. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); relevant for fault-current limiting in power stages. |
| TJ max | 150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" length, 0.157" width, matte tin-plated leads, MSL Level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with cathode band marking; terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, qualified to JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference node | Typically tied to system ground or lower-potential rail; completes shunt path during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power domains. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surge (4 kV/2 Ω) without degradation when mounted per recommended pad layout. |
| Fast response time < 1 ns | Clamps transients before sensitive downstream logic or analog circuitry sustains damage. |
| Glass passivated junction | Ensures stable VBR and low leakage drift across temperature and lifetime stress conditions. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without preconditioning or special handling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp spikes up to 103 V. Use Value: Prevents latch-up or gate oxide failure in microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in PLC modules exposed to relay switching noise. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) TVS connected across differential signal pair (e.g., 4–20 mA loop) to suppress EFT bursts. Use Value: Maintains signal integrity below 103 V clamping level while adding <0.5 ns propagation delay to measurement path. |
| DC-DC Converter Input Stage | MOSFET Gate Driver Protection |
Use Scenario: Input-side transient suppression for buck converters in telecom power supplies subjected to hot-swap surges. IC Role / Device Role / Timing Role: Placed upstream of input filter capacitor to absorb 400 W surge energy before reaching controller IC. Use Value: Enables reliable operation under 100 V transient peaks without derating input capacitor voltage rating. | Use Scenario: Gate protection for high-side N-channel MOSFETs in motor drive half-bridges subject to Miller-induced voltage spikes. IC Role / Device Role / Timing Role: Connected between gate and source to clamp dv/dt-induced overshoot below MOSFET VGS(max). Use Value: Limits gate voltage to ≤103 V, preventing dielectric breakdown of thin gate oxide during fast switching transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64AE3/61 | Commercial-grade (non-AEC-Q101), identical electrical specs and package. | Lacks automotive qualification; suitable for consumer/industrial but not automotive OEM designs. | Select SMAJ64AE3/61 only if AEC-Q101 compliance is not required and cost optimization is prioritized. |
| SMBJ64AHE3/52 | Same VWM/VC ratings but SMB (DO-214AA) package - 25 % larger footprint, 10 % higher PPPM (600 W). | Higher power handling supports heavier surge duty cycles; requires PCB layout change due to larger body size. | Choose SMBJ64AHE3/52 when system-level surge testing exceeds 400 W requirements or thermal margin is constrained. |
Compared with SMAJ64AE3/61, SMAJ64AHE3/61 adds AEC-Q101 qualification without altering clamping performance; versus SMBJ64AHE3/52, it trades 200 W pulse power headroom for smaller board area and tighter layout integration in space-constrained automotive modules.
Availability
SMAJ64AHE3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and sensor interface circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ64AHE3/61 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, automotive qualification, and high-volume manufacturability.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust transient immunity in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising signal fidelity or power efficiency.
FAQ
What is the clamping voltage of SMAJ64AHE3/61 at its rated peak pulse current?
The SMAJ64AHE3/61 has a maximum clamping voltage (VC) of 103 V at its specified peak pulse current (IPPM) of 3.9 A, measured using the standard 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on the protected circuit during transient events and is confirmed in the Vishay datasheet Document Number 88390, page 2.
Is SMAJ64AHE3/61 suitable for automotive applications?
Yes, SMAJ64AHE3/61 is AEC-Q101 qualified, as indicated by the "HE3" suffix in its part number and explicitly stated in the Vishay datasheet revision 09-Jan-2024. This certification validates its reliability for automotive powertrain, body electronics, and ADAS systems operating across -55 °C to +150 °C ambient conditions.
What does the "/61" suffix indicate in SMAJ64AHE3/61?
The "/61" suffix denotes the preferred packaging configuration: 7-inch diameter plastic tape and reel containing 1800 units. This format is optimized for high-speed SMT placement equipment and aligns with industry-standard EIA-481 specifications for automated manufacturing lines.
How does SMAJ64AHE3/61 differ from bidirectional variants like SMAJ64CA?
SMAJ64AHE3/61 is unidirectional and features a cathode band for polarity identification, while SMAJ64CA is bidirectional with no polarity marking and symmetrical clamping in both directions. The unidirectional version offers lower leakage at VWM and is preferred for DC rail protection; bidirectional types are used for AC or floating signal lines.
What is the thermal resistance of SMAJ64AHE3/61, and how does it affect PCB layout?
SMAJ64AHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To maintain safe junction temperature under repeated surges, Vishay recommends mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - reducing RθJA by up to 40 % compared to standard land patterns.
SMAJ64AHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ64AHE3/61 FAQ
1.How can I place an order for SMAJ64AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64AHE3/61 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 SMAJ64AHE3/61 reliable?
The price and inventory of SMAJ64AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ64AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64AHE3/61?
SMAJ64AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64AHE3/61 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 SMAJ64AHE3/61?
For technical support, including SMAJ64AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64AHE3/61 requirements.
6.How does Aetrix verify that SMAJ64AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ64AHE3/61 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 SMAJ64AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ64AHE3/61?
All SMAJ64AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64AHE3/61, 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 SMAJ64AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ64AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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