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Vishay General Semiconductor - Diodes Division SMAJ64AHE3_A/I
- Part No.:
- SMAJ64AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64AHE3_A/I.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,364
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Product details
Overview
SMAJ64AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising voltage transients on power 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_A/I datasheet, SMAJ64AHE3_A/I pinout, SMAJ64AHE3_A/I application, or SMAJ64AHE3_A/I equivalent, this AEC-Q101 qualified TVS offers verified surge immunity for 12 V/24 V DC systems, low-leakage reverse operation up to 64 V, and RoHS-compliant matte tin-plated leads suitable for automated SMT assembly and reflow up to 260 °C.
Technical Context
This unidirectional TVS operates by avalanche breakdown when reverse voltage exceeds its VBR threshold, limiting transient energy via low-clamping VC and fast response time (<1 ps). Its glass-passivated junction ensures stable leakage performance and robust surge handling under repetitive 0.01% duty cycle conditions.
The device is rated for 40 A non-repetitive forward surge current (IFSM) and maintains thermal stability with RθJA = 120 °C/W and RθJL = 30 °C/W. It meets MSL Level 1 per J-STD-020 and supports bidirectional protection variants only when marked with "CA" suffix - not applicable to SMAJ64AHE3_A/I.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 64 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (Breakdown Voltage) | 71.1–78.6 V at 1 mA - precise avalanche initiation range ensuring reliable overvoltage detection |
| VC (Clamping Voltage) | 103 V at IPPM = 3.9 A - limits downstream circuit stress during 10/1000 μs transients |
| PPPM (Peak Pulse Power) | 400 W - sustains 10/1000 μs surges without degradation under defined PCB pad layout |
| IFSM (Surge Current) | 40 A - withstands 8.3 ms half-sine wave surges common in automotive load-dump events |
| TJ Range | −55 °C to +150 °C - enables deployment in under-hood automotive and industrial ambient environments |
| Leakage (ID) | 1.0 μA max at VWM - minimizes standby power loss in battery-powered sensor nodes |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; anode and cathode terminals are axially oriented.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias | Connected to lower-potential side of protected line; enables standard diode conduction path during fault |
| Cathode (banded end) | Current exit point in forward bias; clamping node in reverse bias | Connected to higher-potential rail (e.g., VCC or signal line); defines polarity-sensitive clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and surge endurance |
| Glass passivated junction | Ensures stable VBR tolerance and low parameter drift across lifetime and temperature |
| MSL Level 1 rating | Allows unlimited floor life and single reflow up to 260 °C peak without moisture-induced damage |
| 400 W peak pulse power | Provides robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surge events |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for sensitive 3.3 V/5 V logic |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V supply rails in engine control units (ECUs) and body electronics against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between power input and local regulator/LDO input. Use Value: Limits transient voltage to ≤103 V, preventing latch-up or permanent damage to downstream 36 V-rated regulators and microcontrollers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Reverse-biased TVS connected between signal line and ground to shunt ESD and cable discharge events. Use Value: Clamps ±8 kV contact ESD (IEC 61000-4-2) within nanoseconds while maintaining <1 μA leakage at 64 V system bias. |
| DC-DC Converter Input Stage | Motor Drive Gate Driver Protection |
Use Scenario: Input-side surge suppression for buck/boost converters in telecom power supplies exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary transient limiter upstream of input filter capacitor and controller IC. Use Value: Absorbs 400 W pulses without derating above 78 V, enabling compact design with minimal heatsinking requirements. |
Use Scenario: Protecting high-side/low-side gate driver ICs from Miller-induced voltage spikes during MOSFET/IGBT switching in BLDC inverters. IC Role / Device Role / Timing Role: Local clamping element across gate-source terminals or supply rails of driver ICs. Use Value: Fast response (<1 ps) and low VC prevent false turn-on and gate oxide overstress during dV/dt transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64AE3/61 | Same electrical specs; commercial-grade (non-AEC-Q101), E3 suffix, 7" tape/reel packaging | Lacks automotive qualification; suitable for consumer/industrial designs without AEC compliance requirement | Select when cost sensitivity outweighs automotive qualification needs and volume packaging matches production line setup |
| SMAJ64AHM3_A/I | Halogen-free variant with identical VWM, VBR, VC, and PPPM; HM3 suffix denotes halogen-free RoHS compliance | Required for strict environmental compliance programs (e.g., EU automotive Tier 1 mandates) | Choose when halogen-free material declaration is mandatory, with no trade-off in electrical or thermal performance |
Compared with SMAJ64AHE3_A/I, SMAJ64AE3/61 omits AEC-Q101 validation but reduces cost for non-automotive use, while SMAJ64AHM3_A/I adds halogen-free compliance without altering clamping behavior or thermal derating - enabling direct substitution where material content drives selection.
Availability
SMAJ64AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, and telecom power supplies requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMAJ64AHE3_A/I 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, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series was developed for high-energy transient suppression in space-constrained, high-reliability applications - particularly automotive power distribution, industrial control inputs, and communication interface protection where consistent clamping and AEC-Q101 validation are critical.
FAQ
What is the clamping voltage of the SMAJ64AHE3_A/I under a 10/1000 μs surge?
The SMAJ64AHE3_A/I has a maximum clamping voltage (VC) of 103 V at a peak pulse current (IPPM) of 3.9 A with a 10/1000 μs waveform. This value is measured under standardized test conditions using 0.2" × 0.2" copper pads per terminal and represents the upper limit of voltage seen by protected circuitry during such transients. The SMAJ64AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SMAJ64AHE3_A/I qualified for automotive applications?
Yes, SMAJ64AHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101 qualified construction. This qualification covers stress tests including temperature cycling, highly accelerated life testing (HALT), and surge endurance - making SMAJ64AHE3_A/I suitable for under-hood and chassis-mounted automotive electronics where reliability under harsh thermal and electrical conditions is required.
What does the "_A/I" suffix mean in SMAJ64AHE3_A/I?
The "_A/I" suffix in SMAJ64AHE3_A/I indicates the packaging configuration: "A" denotes the revision level (Revision A), and "I" specifies 13-inch diameter plastic tape-and-reel delivery containing 7500 units. This format aligns with automated SMT placement systems and supports high-volume manufacturing. The base part SMAJ64AHE3 remains unchanged electrically and mechanically across revision and packaging variants.
Can SMAJ64AHE3_A/I be used in bidirectional protection circuits?
No, SMAJ64AHE3_A/I is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix in its part number. It conducts only in forward bias and clamps transients in reverse bias - it cannot suppress positive and negative surges symmetrically. For bidirectional protection, Vishay specifies parts with "CA" suffix (e.g., SMAJ64CA), which have identical VWM and VC ratings in both directions and no polarity marking.
What is the maximum junction temperature rating for SMAJ64AHE3_A/I?
The SMAJ64AHE3_A/I has a maximum junction temperature (TJ) rating of +150 °C and a minimum of −55 °C, supporting operation in demanding environments such as automotive engine compartments and industrial motor controls. Its thermal resistance values - RθJA = 120 °C/W and RθJL = 30 °C/W - allow accurate thermal modeling when mounted on standard PCB copper pads, ensuring safe operation within this full range under specified power dissipation limits.
SMAJ64AHE3_A/I 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:
- -
- 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_A/I FAQ
1.How can I place an order for SMAJ64AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64AHE3_A/I 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_A/I reliable?
The price and inventory of SMAJ64AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ64AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64AHE3_A/I?
SMAJ64AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64AHE3_A/I 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_A/I?
For technical support, including SMAJ64AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ64AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ64AHE3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ64AHE3_A/I?
All SMAJ64AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64AHE3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SMAJ64AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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