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Vishay General Semiconductor - Diodes Division SMAJ64CAHM3_A/H
- Part No.:
- SMAJ64CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64CAHM3_A/H.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,036
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Product details
Overview
SMAJ64CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features 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 (10/1000 μs waveform) - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ64CAHM3_A/H datasheet, SMAJ64CAHM3_A/H pinout, SMAJ64CAHM3_A/H application, or SMAJ64CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical reverse/forward conduction behavior due to its bidirectional construction. Its glass-passivated junction enables fast response (<1 ns) to ESD and lightning-induced transients, while low incremental surge resistance ensures stable clamping under repetitive 10/1000 μs surges at 0.01 % duty cycle.
The SMAJ64CAHM3_A/H 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 and JESD 22-B102 solderability standards. Its halogen-free, RoHS-compliant molding compound satisfies UL 94 V-0 flammability requirements.
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 threshold |
| VBR (Breakdown Voltage) | 71.1–78.6 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events |
| VC (Clamping Voltage) | 103 V at IPPM = 3.9 A - Peak voltage seen by protected circuit during 10/1000 μs transient; determines stress on downstream components |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity under standard 10/1000 μs waveform with 0.01 % duty cycle |
| ID (Max Reverse Leakage) | 1.0 μA at VWM - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits |
| TJ max. | +150 °C - Enables operation in under-hood automotive and industrial environments without derating |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with molded epoxy body and matte tin-plated leads. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; conducts surge current in either direction when voltage exceeds VBR |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; completes bidirectional conduction path with Anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces requiring reliability under thermal cycling and vibration |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for industrial and consumer electronics without compromising surge robustness |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) when properly mounted on 5.0 mm × 5.0 mm copper pads |
| Fast response time (<1 ns) | Clamps transients before sensitive CMOS inputs or gate oxides experience destructive voltage overshoot |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard reflow profiles up to 260 °C peak temperature |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair or supply rail to limit transient excursions. Use Value: Maintains signal fidelity during 100 V/50 ms load dump events while surviving >1000 surge cycles per AEC-Q101 stress testing. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing 400 W surge energy to prevent latch-up or destruction of optocoupler input stages. Use Value: Enables uninterrupted operation during repeated 1 A/10 ms switching transients without degradation in clamping voltage performance. |
| Consumer Power Adapter Output | Telecom Line Interface |
Use Scenario: Secondary-side overvoltage protection on 12 V/19 V SMPS outputs in laptop adapters and gaming PSU designs. IC Role / Device Role / Timing Role: Standoff-rated clamp suppressing flyback transformer leakage spikes and external ESD coupling into output rails. Use Value: Limits output voltage to ≤103 V during 10/1000 μs surges, preventing damage to downstream USB-PD controllers or battery management ICs. |
Use Scenario: Primary protection for Ethernet PHY interface lines (e.g., RJ45 magnetics secondary side) against lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: First-stage TVS on low-capacitance data lines, coordinated with GDT or polymer PTC for staged protection. Use Value: Provides sub-100 ns response to 1 kV/0.5 kA surges while adding <1 pF parasitic capacitance to preserve 100BASE-TX signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64CAHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification | Acceptable for commercial/industrial use where automotive qualification is not required | Select when halogen content or automotive qualification is not mandated and cost optimization is prioritized |
| SMBJ64CAHM3 | Higher 600 W PPPM rating; larger SMB (DO-214AA) package; same VWM/VBR/VC specs | Better suited for higher-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger footprint | Choose when system-level surge test requirements exceed 400 W and layout permits SMB package |
Compared with SMAJ64CAHM3_A/H, SMAJ64CAHE3_A/H lacks halogen-free and AEC-Q101 compliance but offers identical clamping performance in commercial-grade applications, while SMBJ64CAHM3 provides 50 % higher surge power handling in a physically larger package - enabling trade-offs between board area, reliability tier, and surge margin.
Availability
SMAJ64CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, and consumer power adapter protection requiring stable component supply and full traceability.
Supply support for SMAJ64CAHM3_A/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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and repeatable surge endurance are critical.
FAQ
What does the "HM3" suffix indicate in SMAJ64CAHM3_A/H?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. This distinguishes SMAJ64CAHM3_A/H from non-halogen-free variants like HE3 and confirms compliance with automotive reliability standards and environmental regulations - essential for Tier 1 automotive suppliers and industrial safety-critical designs.
Is SMAJ64CAHM3_A/H unidirectional or bidirectional?
SMAJ64CAHM3_A/H is a bidirectional TVS diode, as confirmed by the "CA" designation in its part number and specification table. It provides symmetrical clamping in both polarities, making it suitable for AC signal lines, differential buses (e.g., CAN, RS-485), and floating power rails where polarity reversal may occur during transients.
What is the maximum clamping voltage of SMAJ64CAHM3_A/H and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ64CAHM3_A/H is 103 V, measured at a peak pulse current (IPPM) of 3.9 A under the standardized 10/1000 μs waveform. This value is guaranteed across temperature and represents the worst-case voltage imposed on protected circuitry during surge events.
Does SMAJ64CAHM3_A/H require special PCB layout considerations?
Yes - SMAJ64CAHM3_A/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve its rated 400 W peak pulse power. Smaller pads cause thermal derating; inadequate copper area increases junction temperature and reduces surge survivability, especially under repetitive transients.
How does the thermal resistance RθJA = 120 °C/W impact system-level design for SMAJ64CAHM3_A/H?
The RθJA of 120 °C/W means that at 3.3 W steady-state power dissipation, the junction temperature rises 396 °C above ambient - confirming that SMAJ64CAHM3_A/H is intended only for transient (not continuous) power dissipation. System designers must ensure surge events are infrequent and brief to avoid exceeding the +150 °C TJ max. limit.
SMAJ64CAHM3_A/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:
- Active
- 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_A/H FAQ
1.How can I place an order for SMAJ64CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64CAHM3_A/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 SMAJ64CAHM3_A/H reliable?
The price and inventory of SMAJ64CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ64CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64CAHM3_A/H?
SMAJ64CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64CAHM3_A/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 SMAJ64CAHM3_A/H?
For technical support, including SMAJ64CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ64CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ64CAHM3_A/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 SMAJ64CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ64CAHM3_A/H?
All SMAJ64CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64CAHM3_A/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 SMAJ64CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ64CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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