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Vishay General Semiconductor - Diodes Division SMAJ64CAHM3/I
- Part No.:
- SMAJ64CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64CAHM3/I.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,472
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Product details
Overview
SMAJ64CAHM3/I 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), targeting automotive-grade signal line and power rail protection.
For engineers reviewing the SMAJ64CAHM3/I datasheet, SMAJ64CAHM3/I pinout, SMAJ64CAHM3/I application, or SMAJ64CAHM3/I equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional symmetry, low clamping ratio (VC/VWM ≈ 1.61), halogen-free RoHS compliance (HM3 suffix), and suitability for CAN/LIN bus, sensor I/O, and 12 V/24 V automotive subsystems.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 64 V), then rapidly avalanches to clamp transients within nanoseconds. Its bidirectional structure enables symmetrical clamping on both polarities without polarity marking - critical for AC-coupled or floating signal lines.
The device delivers 400 W peak pulse power up to 78 V (derated to 300 W above), with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W, requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for rated performance. It meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit for safe system operation. |
| VBR (min/max) | 71.1 V / 78.6 V at 1 mA - Breakdown onset range; ensures reliable triggering above VWM with margin against tolerance drift. |
| VC @ IPPM | 103 V at 3.9 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient stress level. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy handling capacity; defines survivability against ISO 7637-2 Pulse 1/2/5a/b events. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports fault-current limiting in DC power paths. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments with derating. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile package with matte tin-plated leads; compatible with automated reflow (260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), 2-terminal surface-mount case with no polarity marking for bidirectional operation. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H), cathode band omitted per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | Shunts negative-going surges to ground or reference rail; symmetric with Cathode under reverse bias. |
| Cathode | Transient current entry (positive polarity event) | Shunts positive-going surges to ground or reference rail; functionally identical to Anode due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards (e.g., ELV, REACH) and supports lead-free reflow assembly. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a (500 V/2 Ω, 100 ms) and IEC 61000-4-5 Combination Wave (1 kV/2 Ω) surges. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage in MOSFETs and microcontrollers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive CAN Bus Protection | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protecting CAN_H/CAN_L differential pair in vehicle ECUs against load dump, ESD, and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing ±25 kV ESD (IEC 61000-4-2) and ±100 V transients (ISO 16750-2) while maintaining signal integrity. Use Value: Prevents CAN transceiver latch-up or destruction without adding series impedance or propagation delay to the bus. |
Use Scenario: Safeguarding analog outputs (4–20 mA, 0–10 V) and digital I/O (I²C, SPI) of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Fast-response (<1 ns) voltage limiter placed directly at connector entry point to divert surge energy before reaching ASIC or ADC. Use Value: Enables >100,000 surge cycles without parameter shift, supporting long-term reliability in unattended industrial deployments. |
| 12 V Power Rail Protection | Automotive LIN Bus Nodes |
|
Use Scenario: Clamping load-dump transients (up to +60 V, 400 ms) on 12 V supply rails feeding infotainment modules and lighting controllers. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy exceeding regulator capability, coordinated with upstream fuses and downstream LDOs. Use Value: Maintains regulated output during SAE J1113-11 Category IV events, avoiding brownout resets or EEPROM corruption. |
Use Scenario: Protecting LIN transceivers and microcontroller GPIOs in door modules, seat controls, and mirror actuators from battery reversal and ESD. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) bidirectional clamp preserving LIN signal rise/fall times (<1 μs) while meeting ISO 11898-4 immunity requirements. Use Value: Ensures uninterrupted communication during 1000+ ESD contact discharges per node lifetime without bit errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64CAHE3/I | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; MSL Level 1, same package. | Lacks halogen-free designation; acceptable for non-automotive commercial use where ELV compliance is not required. | Select when cost sensitivity outweighs halogen-free mandate and AEC-Q101 is not mandatory. |
| SMBJ64CAHM3/I | Same VWM/VC, but SMB (DO-214AA) package: 5.28 mm × 4.50 mm footprint, 400 W rating, higher IPPM (6.2 A). | Offers 55% larger pad area and lower RθJA (90 °C/W), enabling higher surge repetition rates in thermally constrained layouts. | Choose when board space allows larger footprint and enhanced thermal performance is needed for frequent surge exposure. |
Compared with SMAJ64CAHM3/I, SMAJ64CAHE3/I trades halogen-free compliance for lower cost in non-automotive settings, while SMBJ64CAHM3/I provides superior thermal dissipation and surge current headroom at the expense of PCB area - both require layout review but offer validated alternatives for specific reliability or cost targets.
Availability
SMAJ64CAHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and 12 V power rail protection requiring stable component supply across multi-year production programs.
Supply support for SMAJ64CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered for rugged transient suppression in harsh environments - particularly targeting AEC-Q101-compliant automotive subsystems, industrial control inputs, and telecom infrastructure interfaces where fast response and repeatable clamping are critical.
FAQ
What does the "HM3" suffix indicate in SMAJ64CAHM3/I?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. SMAJ64CAHM3/I meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1, making it suitable for automotive under-hood applications where material compliance and thermal robustness are mandatory. This distinguishes SMAJ64CAHM3/I from E3 (RoHS only) or HE3 (AEC-Q101 + RoHS, not halogen-free) variants.
Is SMAJ64CAHM3/I suitable for protecting CAN FD physical layer circuits?
Yes, SMAJ64CAHM3/I is appropriate for CAN FD protection due to its bidirectional symmetry, 103 V clamping voltage at 3.9 A, and sub-nanosecond response time. Its capacitance (~100 pF at 0 V) introduces negligible signal distortion on CAN FD's 5 Mbps bus, and its AEC-Q101 qualification ensures reliability in automotive CAN FD nodes such as ADAS domain controllers and gateway modules.
How does the clamping voltage of SMAJ64CAHM3/I compare to its standoff voltage?
SMAJ64CAHM3/I has a 64 V standoff voltage (VWM) and a maximum clamping voltage (VC) of 103 V at 3.9 A, yielding a clamping ratio of 1.61. This tight ratio ensures protected downstream components - such as 75 V-rated CAN transceivers or 65 V-input DC-DC controllers - remain within safe operating limits during ISO 7637-2 Pulse 5a transients, minimizing risk of overvoltage failure.
Can SMAJ64CAHM3/I be used in parallel for higher surge current handling?
No - SMAJ64CAHM3/I is not recommended for parallel connection due to mismatched VBR tolerances (71.1–78.6 V) causing uneven current sharing and potential thermal runaway. For higher surge ratings, select a single higher-power device like SMBJ64CAHM3/I (6.2 A IPPM) or SMCJ64CAHM3/I (15.4 A IPPM), all sharing identical VWM and VC specifications.
What is the maximum allowable printed circuit board copper pad size for SMAJ64CAHM3/I to achieve full 400 W rating?
To achieve the full 400 W peak pulse power rating, SMAJ64CAHM3/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Smaller pads reduce thermal dissipation, derating power capability - e.g., 0.1" × 0.1" pads may limit sustained surge handling to ~200 W. Thermal simulation or empirical testing is advised for non-standard layouts.
SMAJ64CAHM3/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:
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ64CAHM3/I FAQ
1.How can I place an order for SMAJ64CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64CAHM3/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 SMAJ64CAHM3/I reliable?
The price and inventory of SMAJ64CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ64CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64CAHM3/I?
SMAJ64CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64CAHM3/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 SMAJ64CAHM3/I?
For technical support, including SMAJ64CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64CAHM3/I requirements.
6.How does Aetrix verify that SMAJ64CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ64CAHM3/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 SMAJ64CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ64CAHM3/I?
All SMAJ64CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64CAHM3/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 SMAJ64CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ64CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ64CAHM3/I Tags
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