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Vishay General Semiconductor - Diodes Division SMAJ64AHE3/5A
- Part No.:
- SMAJ64AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64AHE3/5A.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,445
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Product details
Overview
SMAJ64AHE3/5A 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 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ64AHE3/5A datasheet, SMAJ64AHE3/5A pinout, SMAJ64AHE3/5A application, or SMAJ64AHE3/5A equivalent, key selection criteria include verified unidirectional polarity, AEC-Q101 qualification status, clamping performance under 10/1000 μs surge, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a fast-acting 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 long-term reliability across -55 °C to +150 °C operating range.
The device delivers 400 W peak pulse power handling up to 78 V, derating to 300 W above that level; clamping occurs within <1 ns response time, with low incremental surge resistance enabling effective energy diversion away from sensitive downstream circuitry during ESD or inductive switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 64 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 71.1–78.6 V at 1 mA - Confirmed minimum/maximum threshold where device transitions from high- to low-impedance state. |
| VC (Clamping Voltage) | 103 V at IPPM = 3.9 A - Measured voltage across terminals during 10/1000 μs surge; determines maximum stress imposed on protected IC. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Energy-handling capability per single transient event; defines survivability against lightning or load-dump surges. |
| ID (Reverse Leakage) | 1.0 μA max at 64 V - Ensures minimal standby power loss and no false triggering in nominal operation. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and high-ambient industrial environments. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected line's lower-potential side (e.g., GND or return path). | Provides reference point for clamping action; must be routed with low-inductance trace to minimize overshoot during fast transients. |
| Cathode | Current exit terminal in forward bias; marked with band; connected to protected line's higher-potential side (e.g., VCC or signal line). | Defines polarity-sensitive clamping direction; incorrect orientation disables protection and may cause short-circuit failure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock-enables use in engine control, ADAS, and infotainment modules. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients such as ISO 7637-2 Load Dump (up to 120 V, 100 ms) and IEC 61000-4-5 surge without degradation. |
| Fast response time <1 ns | Clamps before most ICs experience latch-up or gate oxide damage, preserving system uptime and reducing need for secondary protection stages. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without moisture-related popcorning or delamination risk. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift-critical for outdoor and high-humidity industrial deployments. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between VBAT and GND, triggered only during overvoltage events. Use Value: Limits peak voltage to ≤103 V, preventing damage to microcontrollers and CAN transceivers rated for 40 V absolute maximum. |
Use Scenario: Safeguarding analog output pins of pressure/temperature sensors exposed to cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface to suppress ESD and induced noise. Use Value: Sub-1 ns response prevents signal corruption during 8 kV contact ESD (IEC 61000-4-2), maintaining measurement integrity. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feed Protection |
|
Use Scenario: Clamping surges on AC/DC adapter primary-side rectified rails caused by mains switching transients. IC Role / Device Role / Timing Role: High-power TVS mounted upstream of bulk capacitor to absorb energy before reaching switching controller. Use Value: 400 W rating sustains repeated 10/1000 μs surges per UL 62368-1 Annex D, extending adapter field life. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to return path, absorbing common-mode transients coupled onto pair conductors. Use Value: 64 V VWM aligns with IEEE 802.3af/bt DC feed margins while 103 V VC stays below 100 V isolation barrier limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A-E3/5A | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and package. | Limited to non-automotive industrial or consumer use where automotive reliability certification is not mandated. | Select when cost sensitivity outweighs automotive qualification requirement and environmental stress testing is not required. |
| SMCJ64AHE3/5A | Higher 1500 W peak pulse power; larger SMC (DO-214AB) package; same VWM/VBR/VC ratings. | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets) where board space allows larger footprint. | Choose when system-level surge test levels exceed IEC 61000-4-5 Level 4 and 400 W is insufficient. |
Compared with SMAJ64A-E3/5A, the SMAJ64AHE3/5A adds AEC-Q101 qualification without altering electrical behavior-making it the preferred choice for automotive designs-while the SMCJ64AHE3/5A trades compactness for higher surge capacity, requiring PCB layout revision but delivering greater robustness in harsher surge environments.
Availability
SMAJ64AHE3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant transient protection.
Supply support for SMAJ64AHE3/5A 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, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series targets cost-effective, high-volume transient suppression in space-constrained applications-designed specifically for robust ESD and surge protection in automotive, industrial, and consumer electronics without compromising SMT manufacturability.
FAQ
What is the clamping voltage of SMAJ64AHE3/5A at its rated peak pulse current?
The SMAJ64AHE3/5A has a maximum clamping voltage (VC) of 103 V when subjected to its specified peak pulse current (IPPM) of 3.9 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ64AHE3/5A maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), ensuring consistent protection in demanding environments.
Is SMAJ64AHE3/5A suitable for automotive applications?
Yes, SMAJ64AHE3/5A is AEC-Q101 qualified, meaning it has passed rigorous stress tests-including temperature cycling, high-temperature operating life, and mechanical shock-required for automotive electronic components. Its 64 V stand-off voltage and 103 V clamping voltage align with 12 V system architectures, and the HE3 suffix explicitly denotes this qualification. The SMAJ64AHE3/5A is commonly deployed in engine control units, body electronics, and ADAS sensor modules where reliability under vibration and thermal extremes is critical.
How does the SMAJ64AHE3/5A differ from SMAJ64A-E3/5A?
The SMAJ64AHE3/5A and SMAJ64A-E3/5A share identical electrical specifications-including VWM (64 V), VBR (71.1–78.6 V), VC (103 V), and PPPM (400 W)-and the same SMA (DO-214AC) package. The sole difference is qualification: SMAJ64AHE3/5A carries AEC-Q101 certification, while SMAJ64A-E3/5A is commercial-grade only. Both use RoHS-compliant matte tin plating and meet MSL Level 1, but only the HE3 version is approved for automotive under-hood and chassis applications.
What is the thermal resistance of SMAJ64AHE3/5A, and how does it affect layout?
The SMAJ64AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard JEDEC test conditions and guides PCB layout: increasing copper area or adding thermal vias reduces effective RθJA, improving surge repetition capability. For designs expecting frequent transients, designers should verify junction temperature rise using PD = 3.3 W (steady-state power dissipation) and ensure TJ remains ≤150 °C under worst-case ambient conditions.
Can SMAJ64AHE3/5A be used in bidirectional configurations?
No, SMAJ64AHE3/5A is a unidirectional TVS diode, as indicated by the "A" suffix and presence of cathode band marking. Bidirectional variants carry the "CA" suffix (e.g., SMAJ64CA). Using SMAJ64AHE3/5A in reverse-biased configurations risks permanent breakdown due to lack of symmetrical avalanche structure. For AC-coupled or floating signal lines requiring protection in both polarities, the SMAJ64CAHE3/5A-or equivalent bidirectional part-must be selected instead of SMAJ64AHE3/5A.
SMAJ64AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMAJ64AHE3/5A FAQ
1.How can I place an order for SMAJ64AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64AHE3/5A 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 SMAJ64AHE3/5A reliable?
The price and inventory of SMAJ64AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ64AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64AHE3/5A?
SMAJ64AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64AHE3/5A 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 SMAJ64AHE3/5A?
For technical support, including SMAJ64AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64AHE3/5A requirements.
6.How does Aetrix verify that SMAJ64AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ64AHE3/5A 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 SMAJ64AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ64AHE3/5A?
All SMAJ64AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64AHE3/5A, 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 SMAJ64AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ64AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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