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Vishay General Semiconductor - Diodes Division SMAJ64CAHE3/61
- Part No.:
- SMAJ64CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64CAHE3/61.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,313
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Product details
Overview
SMAJ64CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 64 V standoff voltage (VWM), 71.1–78.6 V breakdown range (VBR at 1 mA), 103 V maximum clamping voltage (VC) at 3.9 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), commonly deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ64CAHE3/61 datasheet, SMAJ64CAHE3/61 pinout, SMAJ64CAHE3/61 application, or SMAJ64CAHE3/61 equivalent, key selection considerations include bidirectional clamping symmetry, AEC-Q101 qualification for automotive use, low thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding VWM, it avalanches symmetrically in both directions to clamp voltage at ≤103 V while diverting surge current up to 3.9 A. Its glass-passivated junction ensures stable leakage (<1.0 μA at 64 V) and fast response time (<1.0 ns), critical for protecting MOSFET gates and microcontroller I/O pins.
The SMAJ64CAHE3/61 is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020, and uses matte tin-plated leads compliant with J-STD-002 solderability standards. Its DO-214AC package enables high-density layout with minimal board area while maintaining 3.3 W steady-state power dissipation capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 64 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR (Breakdown Voltage) | 71.1–78.6 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| VC (Clamping Voltage) | 103 V at IPPM = 3.9 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity under standardized waveform; defines protection level against ISO 7637-2 pulses. |
| IPPM (Peak Pulse Current) | 3.9 A - Maximum transient current diverted during clamping; used to size PCB trace width and grounding paths. |
| TJmax | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); terminals are matte tin-plated for lead-free reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Accepts surge current from either direction; connects to protected line (e.g., CAN_H or 12 V rail). |
| Cathode | Transient current exit point (bidirectional) | Completes shunt path to ground or return rail; requires low-inductance connection to minimize clamping overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock-enables direct use in ECU, ADAS, and body control modules. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as load dump (ISO 16750-2) and inductive switching spikes without degradation. |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes overvoltage stress on downstream ICs-critical for 3.3 V or 5 V logic interfacing with 48 V systems. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT processes without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable leakage current (<1.0 μA at VWM) and long-term parameter stability across temperature and life cycle. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed control units from load dump and alternator ripple transients per ISO 16750-2. IC Role / Device Role / Timing Role: Shunt TVS diode placed between power rail and chassis ground to clamp surges within 1 ns. Use Value: Limits rail voltage to ≤103 V during 400 W transients, preventing damage to MCU power supplies and gate drivers. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loops) and digital I/O (CAN, LIN) in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional clamping element on differential signal pairs to suppress ESD and EFT events. Use Value: Maintains signal integrity by clamping ±15 kV ESD (IEC 61000-4-2) to <±105 V without latch-up or parameter shift. |
| Consumer Power Adapter Input Stage | Telecom DC Power Interface |
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters and AC/DC converters exposed to mains transients. IC Role / Device Role / Timing Role: Standoff-rated TVS across output capacitor to absorb flyback spikes and cross-regulation overshoot. Use Value: Prevents overvoltage shutdown of USB-PD controllers by clamping 64 V nominal outputs to ≤103 V during 3.9 A surges. |
Use Scenario: Primary protection for -48 V telecom power feeds against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Bidirectional shunt device on PSE/PD interface to meet GR-1089-CORE Level 3 surge immunity. Use Value: Absorbs 400 W line-to-ground surges while maintaining <1 μA leakage at -48 V, ensuring standby power budget compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM or regional regulation. | Choose SMAJ64CA-M3/61 if halogen-free content is required; otherwise SMAJ64CAHE3/61 offers same performance with standard RoHS compliance. |
| SMBJ64CAHE3/52 | Same VWM/VC ratings but in larger SMB (DO-214AA) package; higher RθJA (90 °C/W) and 600 W PPPM. | Better thermal performance and surge margin; requires more PCB area and may not fit space-constrained layouts. | Select SMBJ64CAHE3/52 only when higher pulse power (600 W) or improved thermal derating is needed; SMAJ64CAHE3/61 remains optimal for compact automotive modules. |
Compared with SMAJ64CA-M3/61, the SMAJ64CAHE3/61 offers identical protection performance with standard RoHS compliance, while SMBJ64CAHE3/52 provides higher surge capacity at the cost of footprint and thermal resistance-making SMAJ64CAHE3/61 the balanced choice for space-constrained, AEC-Q101–required designs.
Availability
SMAJ64CAHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power supply designs requiring stable component supply, AEC-Q101 validation, and consistent surge immunity performance across production batches.
Supply support for SMAJ64CAHE3/61 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, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where consistent clamping behavior and long-term parametric stability are mandatory.
FAQ
What is the clamping voltage of the SMAJ64CAHE3/61 under a 10/1000 μs surge?
The SMAJ64CAHE3/61 has a maximum clamping voltage (VC) of 103 V at a peak pulse current (IPPM) of 3.9 A under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and reflects the actual voltage imposed on the protected circuit during worst-case transient events, ensuring downstream components remain within safe operating limits.
Is the SMAJ64CAHE3/61 suitable for automotive applications?
Yes, the SMAJ64CAHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use with suffix "HE3". It meets stringent requirements for temperature cycling, mechanical shock, and long-term reliability in engine control units, body electronics, and ADAS subsystems-confirmed by Vishay's qualification report referenced in Document Number 88390.
How does the bidirectional design of SMAJ64CAHE3/61 affect its usage compared to unidirectional variants?
The SMAJ64CAHE3/61 has symmetrical breakdown and clamping characteristics in both directions, making it ideal for AC-coupled lines, differential buses (e.g., CAN), or any application where polarity reversal or bipolar transients occur. Unlike unidirectional types, it requires no cathode marking and eliminates risk of incorrect orientation during assembly-reducing manufacturing errors in high-volume SMT lines.
What is the maximum steady-state power dissipation for SMAJ64CAHE3/61?
The SMAJ64CAHE3/61 has a maximum steady-state power dissipation (PD) of 3.3 W at TA = 50 °C on an infinite heatsink. In practical PCB layouts with 0.2" × 0.2" copper pads per terminal, derating applies per Figure 2 in the datasheet-ensuring safe operation under continuous leakage conditions without thermal runaway.
Does SMAJ64CAHE3/61 require special PCB layout considerations?
Yes-optimal performance of SMAJ64CAHE3/61 depends on low-inductance grounding: Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Short, wide traces to ground minimize clamping overshoot, and avoiding vias in the TVS path preserves sub-nanosecond response. The DO-214AC footprint must follow IPC-7351B standard land patterns for reliable reflow yield.
SMAJ64CAHE3/61 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ64CAHE3/61 FAQ
1.How can I place an order for SMAJ64CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64CAHE3/61 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 SMAJ64CAHE3/61 reliable?
The price and inventory of SMAJ64CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ64CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64CAHE3/61?
SMAJ64CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64CAHE3/61 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 SMAJ64CAHE3/61?
For technical support, including SMAJ64CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ64CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ64CAHE3/61 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 SMAJ64CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ64CAHE3/61?
All SMAJ64CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64CAHE3/61, 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 SMAJ64CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ64CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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