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Vishay General Semiconductor - Diodes Division SMAJ64A-E3/5A
- Part No.:
- SMAJ64A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64A-E3/5A.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,454
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Product details
Overview
SMAJ64A-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 64 V standoff voltage (VWM), 71.1–78.6 V breakdown range at 1 mA, clamps transients to ≤103 V at 3.9 A peak pulse current, and delivers 400 W peak pulse power (10/1000 μs waveform) - ideal for safeguarding MOSFET gates, microcontroller I/O lines, and sensor signal paths in industrial motor drives.
For engineers reviewing the SMAJ64A-E3/5A datasheet, SMAJ64A-E3/5A pinout, SMAJ64A-E3/5A application, or SMAJ64A-E3/5A equivalent, key selection criteria include its 103 V clamping voltage under 3.9 A surge, low 1.0 μA reverse leakage at 64 V, SMA (DO-214AC) surface-mount package with cathode band polarity marking, and AEC-Q101 qualification readiness via HE3/HM3 variants.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and fast response time (<1 ns), while the low incremental surge resistance minimizes clamping voltage overshoot during high-di/dt events.
Designed for unidirectional DC line protection, SMAJ64A-E3/5A exhibits forward voltage drop of 3.5 V at 25 A (per datasheet note 6), supports 40 A non-repetitive surge (8.3 ms half-sine), and maintains operation across -55 °C to +150 °C junction temperature range - enabling use in automotive engine control units and industrial PLC backplanes without derating below 78 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 64 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin for protected line |
| VBR (Breakdown Voltage) | 71.1–78.6 V at 1 mA - precise avalanche onset range ensuring predictable clamping initiation |
| VC (Clamping Voltage) | ≤103 V at 3.9 A (10/1000 μs) - limits transient energy delivered to downstream ICs to safe levels |
| IPPM (Peak Pulse Current) | 3.9 A - maximum single-event surge current the device can safely clamp without degradation |
| PPPM (Peak Pulse Power) | 400 W - energy-handling capacity for standard lightning/surge immunity testing (IEC 61000-4-5) |
| ID (Reverse Leakage) | ≤1.0 μA at 64 V - negligible standby power loss and no measurable loading on high-impedance signal lines |
| TJmax | +150 °C - enables placement near heat-generating components like power MOSFETs without thermal derating |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads; cathode identified by a single band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or lower-potential rail in unidirectional protection | Provides low-impedance path to sink surge current away from protected IC when transient exceeds VWM |
| Cathode | Current exit terminal in forward bias; connected to protected line (e.g., VCC, signal trace) | Acts as reference node for clamping action; band marking ensures correct PCB orientation during automated assembly |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment interfaces |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes voltage overshoot during fast transients, reducing stress on downstream 75 V-rated MOSFETs |
| MSL Level 1 (JEDEC J-STD-020) | Enables standard reflow soldering without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification option (HE3 suffix) | Supports automotive-grade deployment in body control modules and ADAS sensor interfaces |
| Glass-passivated junction | Ensures long-term parameter stability and resistance to humidity-induced parameter drift in harsh environments |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver ICs against inductive kickback from 24 V solenoid coils and relay switching. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between gate driver output and MOSFET gate, referenced to source. Use Value: Limits gate-source voltage to ≤103 V during 40 A turn-off surges, preventing oxide breakdown in 60 V-rated logic-level MOSFETs. |
Use Scenario: Shielding LIN bus transceivers from load dump and jump-start transients in door module ECUs. IC Role / Device Role / Timing Role: Line-side TVS on LIN signal line, cathode tied to LIN_H, anode to ground. Use Value: Clamps 100 V/100 ms load dump spikes to <103 V within <1 ns, preserving transceiver integrity per ISO 16750-2. |
| Industrial PLC Analog Input Cards | Consumer Appliance Sensor Interfaces |
|
Use Scenario: Guarding 4–20 mA current loop receivers against ESD and field-wiring faults in factory automation systems. IC Role / Device Role / Timing Role: Series-connected TVS on loop supply line, with cathode toward receiver IC input. Use Value: Maintains ≤1.0 μA leakage at 24 V nominal, avoiding measurement error while clamping 4 kV ESD (IEC 61000-4-2) to safe levels. |
Use Scenario: Protecting thermistor and Hall-effect sensor outputs in washing machine control boards from EMI coupling and user ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS on sensor analog output trace, cathode to MCU ADC input. Use Value: Adds <0.5 pF parasitic capacitance (typical), preserving signal bandwidth up to 1 MHz without filtering distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64CA-E3/5A | Bidirectional variant; symmetric breakdown (71.1–78.6 V) in both polarities; same VC and PPPM | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs | Select SMAJ64CA-E3/5A only when protecting bidirectional signals; SMAJ64A-E3/5A is optimal for DC rails with defined ground reference |
| SMCJ64A-E3/57T | Higher 1500 W PPPM; larger SMC (DO-214AB) package; 5.0 A IPPM; identical VWM/VBR/VC | Used where higher surge margin is mandated (e.g., outdoor telecom power inputs, solar charge controllers) | Choose SMCJ64A-E3/57T for >400 W surge requirements; SMAJ64A-E3/5A fits space-constrained layouts needing 400 W capability |
Compared with SMAJ64CA-E3/5A, SMAJ64A-E3/5A provides superior DC rail protection with lower leakage and simpler layout; versus SMCJ64A-E3/57T, it offers 60% smaller footprint and compatible reflow profile but trades off absolute surge headroom for compactness.
Availability
SMAJ64A-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and PLC analog input cards requiring stable component supply, RoHS-compliant commercial-grade TVS diodes, and 13" tape-and-reel delivery for high-volume SMT production.
Supply support for SMAJ64A-E3/5A 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series targets cost-sensitive, high-volume transient suppression needs in industrial, computing, and automotive electronics - delivering standardized 400 W surge capability in the industry-standard SMA package with AEC-Q101-ready variants.
FAQ
What is the maximum clamping voltage of SMAJ64A-E3/5A under standard surge conditions?
The SMAJ64A-E3/5A clamps to a maximum of 103 V when subjected to a 10/1000 μs waveform with a peak pulse current of 3.9 A. This value is guaranteed per Vishay's datasheet (Document Number: 88390, Rev. 09-Jan-2024) and represents the upper limit of voltage seen by protected circuitry during standardized surge events - critical for verifying compatibility with 75 V-rated downstream components.
Is SMAJ64A-E3/5A suitable for automotive applications?
SMAJ64A-E3/5A itself is a commercial-grade part (E3 suffix), but Vishay offers AEC-Q101-qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ64AHE3_A/I). For automotive body control modules or infotainment power rails, specify the HE3 variant; SMAJ64A-E3/5A remains appropriate for non-safety-critical industrial or consumer designs where AEC-Q101 is not mandated.
How does the SMAJ64A-E3/5A differ from the SMAJ64CA-E3/5A?
SMAJ64A-E3/5A is unidirectional - it conducts only when cathode voltage exceeds anode by ≥71.1 V - making it ideal for DC power rails and signal lines with fixed polarity. SMAJ64CA-E3/5A is bidirectional, with symmetric breakdown in both directions, required for AC signals or floating buses like RS-485. Both share identical VWM, VBR, VC, and PPPM, but polarity handling differs fundamentally.
What is the thermal resistance and power dissipation capability of SMAJ64A-E3/5A?
SMAJ64A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and a steady-state power dissipation (PD) of 3.3 W at TA = 50 °C. These values assume mounting on 0.2" × 0.2" copper pads per datasheet condition; actual board layout directly impacts thermal performance, especially in high-temperature enclosures.
Does SMAJ64A-E3/5A require special handling or PCB layout considerations?
Yes - SMAJ64A-E3/5A must be placed as close as possible to the protected node (e.g., IC pin or connector) to minimize trace inductance, which otherwise increases clamping voltage during fast transients. The SMA (DO-214AC) package is MSL Level 1, so no baking is needed before reflow; however, ensure cathode band orientation matches silkscreen polarity to avoid functional failure.
SMAJ64A-E3/5A 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-E3/5A FAQ
1.How can I place an order for SMAJ64A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64A-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ64A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ64A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64A-E3/5A?
SMAJ64A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64A-E3/5A 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-E3/5A?
For technical support, including SMAJ64A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64A-E3/5A requirements.
6.How does Aetrix verify that SMAJ64A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ64A-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ64A-E3/5A?
All SMAJ64A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64A-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ64A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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