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Vishay General Semiconductor - Diodes Division SMAJ64AHM3_A/I
- Part No.:
- SMAJ64AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64AHM3_A/I.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,906
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Product details
Overview
SMAJ64AHM3_A/I from Vishay General Semiconductor is a unidirectional 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 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 rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ64AHM3_A/I datasheet, SMAJ64AHM3_A/I pinout, SMAJ64AHM3_A/I application, or SMAJ64AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, low incremental surge resistance, and suitability for high-reliability 12 V/24 V automotive power systems requiring fast-response (<1 ns) transient suppression.
Technical Context
This unidirectional TVS operates as a clamping device that remains non-conductive below 64 V and rapidly transitions to low-impedance conduction above its 71.1–78.6 V breakdown threshold, limiting transient energy to safe levels. Its glass-passivated junction ensures stable leakage performance and long-term reliability under repetitive surge stress.
The device delivers 400 W peak pulse power handling up to 78 V (derated to 300 W above 78 V), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling effective heat dissipation on standard 0.2" × 0.2" copper pads without additional heatsinking in typical PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 64 V - Maximum continuous reverse operating voltage before significant leakage; defines system operating margin for 12 V/24 V rail protection. |
| VBR (Breakdown Voltage) | 71.1–78.6 V at 1 mA - Tight tolerance ensures predictable turn-on during transients; critical for coordination with downstream IC overvoltage thresholds. |
| VC (Clamping Voltage) | 103 V at IPPM = 3.9 A - Limits peak voltage seen by protected circuitry during 10/1000 μs surge; enables compatibility with 100 V-rated MOSFETs and controllers. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Sustains industry-standard ISO 7637-2 Pulse 1/2/5a surges without degradation when mounted per recommended pad layout. |
| ID (Reverse Leakage) | 1.0 μA max at VWM - Negligible standby current draw; preserves battery life in always-on automotive modules. |
| TJ max | 150 °C - Supports operation in under-hood environments and industrial enclosures with elevated ambient temperatures. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile package compatible with automated placement and reflow soldering per J-STD-020 MSL Level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V supply or CAN_H); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for ECU, ADAS, and body control module deployment. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and supports lead-free reflow profiles without compromising mechanical or electrical performance. |
| 400 W peak pulse power (10/1000 μs) | Withstands multiple ISO 7637-2 Pulse 5a surges (up to 100 V, 100 ms) without parameter shift or failure in properly laid-out PCBs. |
| Fast response time (<1 ns) | Activates before sensitive semiconductor junctions experience destructive overvoltage - essential for protecting microcontrollers and transceivers. |
| Low incremental surge resistance | Minimizes voltage overshoot during high di/dt events, improving clamping precision and reducing stress on downstream components. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply inputs in engine control units against load dump and inductive switching transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power input and ground, absorbing energy from 100 V/400 ms load dump pulses. Use Value: Enables compliance with OEM power-supply immunity requirements while maintaining <1 μA leakage to preserve quiescent current budgets. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in pressure/temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and return paths to clamp ±15 kV contact ESD (IEC 61000-4-2) without distorting DC accuracy. Use Value: Prevents latch-up or parametric shift in precision op-amps and ADC drivers while adding <0.5 pF parasitic capacitance at 0 V bias. |
| Telecom Interface Surge Suppression | Consumer Device USB Port Protection |
|
Use Scenario: Shielding RS-485 transceiver I/O pins in base station backhaul equipment from lightning-induced surges on long-distance cabling. IC Role / Device Role / Timing Role: Bidirectional-capable variant family member used in unidirectional configuration to clamp common-mode transients on differential pairs. Use Value: Delivers 300 W clamping capability at 78+ V standoff, allowing co-location with 3.3 V logic-level transceivers via series impedance matching. |
Use Scenario: Adding secondary overvoltage defense on VBUS lines of USB-C ports in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB power delivery controller to limit fault voltage during hot-plug or adapter mismatch events. Use Value: Survives repeated 8 kV air/15 kV contact ESD strikes while maintaining <100 nA leakage at 5 V - ensuring no impact on USB enumeration timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64AHE3_A/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified. | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial designs without automotive compliance mandates. | Select SMAJ64AHE3_A/I only if AEC-Q101 and halogen-free requirements are not enforced in the target application. |
| SMBJ64A-M3/5A | Higher 600 W peak pulse power (SMB package), larger footprint (DO-214AA), same VWM/VBR/VC ratings. | Better thermal performance (RθJA = 80 °C/W) and higher surge margin; requires PCB layout change due to larger pad area and pitch. | Choose SMBJ64A-M3/5A when system-level surge testing exceeds 400 W requirements or extended thermal cycling is expected. |
Compared with SMAJ64AHM3_A/I, SMAJ64AHE3_A/I omits automotive qualification and halogen-free status but matches all electrical parameters, while SMBJ64A-M3/5A trades compact size for higher power handling and improved thermal derating - making SMAJ64AHM3_A/I optimal for space-constrained AEC-Q101-compliant automotive modules.
Availability
SMAJ64AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom infrastructure equipment, and consumer USB power delivery systems requiring stable component supply and full regulatory compliance traceability.
Supply support for SMAJ64AHM3_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, efficiency, and application-specific optimization.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive, industrial, and communications systems - balancing compact packaging, AEC-Q101 qualification, and precise clamping performance across wide voltage ranges.
FAQ
What is the maximum clamping voltage of SMAJ64AHM3_A/I at its rated peak pulse current?
The SMAJ64AHM3_A/I has a maximum clamping voltage (VC) of 103 V at its specified peak pulse current (IPPM) of 3.9 A under a 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees the protected circuit will not experience voltages exceeding 103 V during standardized surge events - a critical parameter for ensuring compatibility with 100 V-rated downstream components like power MOSFETs and gate drivers in automotive applications.
Is SMAJ64AHM3_A/I suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMAJ64AHM3_A/I is explicitly AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's official datasheet (Document Number: 88390). The HM3 designation indicates halogen-free, RoHS-compliant, and AEC-Q101-qualified construction - making SMAJ64AHM3_A/I appropriate for use in engine control units, body electronics, and ADAS modules where automotive-grade reliability and process validation are mandatory.
What does the "HM3" suffix in SMAJ64AHM3_A/I signify?
The "HM3" suffix in SMAJ64AHM3_A/I denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. Per Vishay's ordering information, HM3 parts meet JESD 201 Class 2 whisker resistance, UL 94 V-0 flammability, and automotive stress-test requirements - distinguishing them from E3 (RoHS-only commercial) and HE3 (AEC-Q101 but not halogen-free) variants. This ensures full regulatory alignment for global automotive Tier 1 supply chains.
How does the thermal performance of SMAJ64AHM3_A/I affect PCB layout decisions?
SMAJ64AHM3_A/I has a junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads. To maintain TJ ≤ 150 °C under worst-case 400 W surge conditions, designers must ensure adequate copper area and avoid thermal bottlenecks - such as narrow traces or insufficient vias - near the SMA pads. Layout adherence to Vishay's suggested pad dimensions directly impacts sustained surge survivability and long-term parameter stability.
Can SMAJ64AHM3_A/I be used in bidirectional configurations?
No, SMAJ64AHM3_A/I is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and presence of a cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMAJ64CA), which lacks polarity marking and exhibits symmetrical breakdown in both directions. Using SMAJ64AHM3_A/I in reverse-biased configurations risks permanent damage due to forward conduction beyond its 40 A IFSM rating.
SMAJ64AHM3_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:
- 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)
SMAJ64AHM3_A/I FAQ
1.How can I place an order for SMAJ64AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64AHM3_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 SMAJ64AHM3_A/I reliable?
The price and inventory of SMAJ64AHM3_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 SMAJ64AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ64AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64AHM3_A/I?
SMAJ64AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64AHM3_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 SMAJ64AHM3_A/I?
For technical support, including SMAJ64AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ64AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ64AHM3_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 SMAJ64AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ64AHM3_A/I?
All SMAJ64AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64AHM3_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 SMAJ64AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ64AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ64AHM3_A/I Tags
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