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Vishay General Semiconductor - Diodes Division SMAJ64AHM3/H
- Part No.:
- SMAJ64AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64AHM3/H.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,918
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Product details
Overview
SMAJ64AHM3/H 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 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 SMAJ64AHM3/H datasheet, SMAJ64AHM3/H pinout, SMAJ64AHM3/H application, or SMAJ64AHM3/H 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 12 V/24 V DC bus and CAN/LIN line protection where fast response (<1 ns) and repeatable clamping are required.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp with cathode-banded polarity, leveraging glass-passivated silicon junction technology for stable breakdown behavior under repetitive transient stress. Its thermal resistance (RθJA = 120 °C/W) and RθJL = 30 °C/W support operation up to 150 °C junction temperature when mounted on 5.0 mm × 5.0 mm copper pads per terminal.
The device meets MSL level 1 per J-STD-020 (peak reflow 260 °C), uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and delivers 400 W peak pulse power below 78 V - derating to 300 W above that threshold per Fig. 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working range on protected line |
| VBR min/max | 71.1 V / 78.6 V at IT = 1 mA - tight breakdown window ensures predictable turn-on and minimal overvoltage during transients |
| VC @ IPPM | 103 V at 3.9 A - clamping voltage limits downstream component stress during 10/1000 μs surge events |
| PPPM | 400 W (10/1000 μs) - energy-handling capacity sufficient for ISO 7637-2 Pulse 1/2a/2b and IEC 61000-4-5 Level 3 surges |
| ID @ VWM | 1.0 μA - ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max | +150 °C - enables use in under-hood automotive environments and high-ambient industrial enclosures |
| Package | SMA (DO-214AC) - industry-standard SMD outline compatible with automated placement and reflow soldering |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-axis molded case with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); weight: 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line's lower-potential side | Enables unidirectional clamping from cathode to anode; must be tied to ground or return path for proper transient shunting |
| Cathode | Current exit point in forward bias; marked by black band on package body | Connected to the line being protected (e.g., 12 V rail or signal trace); conducts surge current to ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per AEC standard |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global automotive and industrial OEM supply chains without compromising thermal performance |
| 400 W peak pulse power (10/1000 μs) | Handles repeated load-dump and inductive-switching transients common in 12 V/24 V vehicle electrical systems |
| Very fast response time (< 1 ns) | Clamps before sensitive downstream components (e.g., MCU I/O, CAN transceivers) experience damaging overvoltage |
| Low incremental surge resistance | Minimizes voltage overshoot during high-di/dt events, improving clamping precision and system-level ESD robustness |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 load dump pulses and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients exceeding 64 V. Use Value: Limits peak voltage to ≤103 V during 400 W surges, preventing damage to voltage regulators and microcontrollers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected across signal and return paths to absorb ±8 kV contact ESD per IEC 61000-4-2. Use Value: Sub-μA leakage at 64 V avoids loading precision current sources; fast response prevents latch-up in op-amp front-ends. |
| Automotive CAN Bus Line Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Secondary protection on CAN_H/CAN_L lines downstream of common-mode choke and primary TVS. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to ground on each differential line to suppress asymmetrical surges. Use Value: 103 V clamping ensures CAN transceiver I/O remains within absolute maximum ratings during ISO 16750-2 pulse tests. |
Use Scenario: Input-stage surge suppression in wall-mounted AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: TVS installed after bridge rectifier to clamp line-to-ground transients from AC mains coupling. Use Value: 64 V VWM matches typical 70–90 V DC bus levels post-rectification; 400 W rating handles IEC 61000-4-5 combination wave surges. |
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/H | Same electrical specs but RoHS-compliant (E3), non-halogen-free; not AEC-Q101 qualified | Approved for commercial/industrial use only; unsuitable for automotive Tier-1 production | Select when AEC-Q101 is not required and halogen-free content is not mandated by OEM spec |
| SMAJ64A-M3/61 | Identical electrical parameters and halogen-free RoHS compliance; differs only in packaging (61 = 7" reel, 1800 pcs) | No functional difference; same AEC-Q101 qualification and thermal performance | Choose based on preferred tape-and-reel format and volume procurement logistics |
Compared with SMAJ64AHM3/H, SMAJ64AHE3/H lacks automotive qualification and halogen-free status, limiting deployment to non-automotive designs; SMAJ64A-M3/61 offers identical performance and compliance but in a different reel configuration-no design or layout changes needed when switching between HM3/H and M3/61 variants.
Availability
SMAJ64AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and consumer power adapter designs requiring stable component supply, long-term lifecycle support, and full traceability.
Supply support for SMAJ64AHM3/H 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 engineered for high-energy transient suppression in harsh environments - particularly automotive and industrial applications demanding AEC-Q101 validation, low leakage, and repeatable clamping performance under thermal stress.
FAQ
What is the maximum clamping voltage of the SMAJ64AHM3/H under a 10/1000 μs surge?
The SMAJ64AHM3/H has a maximum clamping voltage (VC) of 103 V at 3.9 A peak pulse current (IPPM), measured using the standardized 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88390. The SMAJ64AHM3/H maintains this clamping performance across its specified operating temperature range.
Is the SMAJ64AHM3/H suitable for automotive applications?
Yes, the SMAJ64AHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It meets rigorous stress tests including temperature cycling, high-temperature operating life, and mechanical shock - making it appropriate for engine control units, body electronics, and infotainment systems. The SMAJ64AHM3/H is explicitly listed in Vishay's automotive ordering code table with qualification noted.
What does the "H" in SMAJ64AHM3/H signify?
The "H" in SMAJ64AHM3/H is the package code indicating 7-inch diameter plastic tape-and-reel packaging containing 1800 units, per Vishay's Ordering Information table on page 3 of document 88390. It does not affect electrical or thermal specifications - all SMAJ64AHM3/H units share identical VWM, VBR, VC, and AEC-Q101 qualification regardless of reel size. The SMAJ64AHM3/H is functionally equivalent to SMAJ64A-M3/61, differing only in packaging format.
How does the SMAJ64AHM3/H compare to bidirectional TVS diodes like SMAJ64CA?
The SMAJ64AHM3/H is unidirectional and intended for DC line protection where polarity is fixed (e.g., +12 V rail to ground), while SMAJ64CA is bidirectional and suited for AC or differential signal lines (e.g., RS-485, CAN). SMAJ64AHM3/H exhibits 1.0 μA leakage at 64 V, whereas SMAJ64CA shows higher leakage due to dual-junction structure. Clamping voltage and peak power are comparable, but SMAJ64AHM3/H provides tighter VBR tolerance and lower capacitance in DC-coupled applications.
What PCB pad layout is recommended for optimal thermal performance of the SMAJ64AHM3/H?
Vishay specifies mounting the SMAJ64AHM3/H on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W peak pulse power and thermal resistance (RθJA = 120 °C/W). Reducing pad area lowers surge capability and increases junction temperature - for example, smaller pads may limit PPPM to 300 W or less. The SMAJ64AHM3/H datasheet Figure 2 confirms derating curves based on pad size and ambient temperature.
SMAJ64AHM3/H 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:
- 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/H FAQ
1.How can I place an order for SMAJ64AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64AHM3/H 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/H reliable?
The price and inventory of SMAJ64AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ64AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64AHM3/H?
SMAJ64AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64AHM3/H 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/H?
For technical support, including SMAJ64AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64AHM3/H requirements.
6.How does Aetrix verify that SMAJ64AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ64AHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ64AHM3/H?
All SMAJ64AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64AHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ64AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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