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Vishay General Semiconductor - Diodes Division SMAJ64AHM3_A/H
- Part No.:
- SMAJ64AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64AHM3_A/H.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ64AHM3_A/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 a 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_A/H datasheet, SMAJ64AHM3_A/H pinout, SMAJ64AHM3_A/H application, or SMAJ64AHM3_A/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 compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device: under normal bias it presents high impedance above 64 V reverse stand-off, then rapidly transitions to low-impedance conduction when transient voltage exceeds its 71.1–78.6 V breakdown range. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), critical for protecting sensitive inputs against ESD and inductive switching spikes.
The SMAJ64AHM3_A/H delivers 400 W peak pulse power (derated to 300 W above 78 V) with a 10/1000 μs waveform, supported by thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). Its polarity marking (cathode band) enables unambiguous orientation during assembly, and it meets MSL level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working margin. |
| VBR (min/max) | 71.1 V / 78.6 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 103 V at 3.9 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy handling capability; defines survivability against repetitive transients. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at rated stand-off; ensures minimal standby power loss and signal integrity. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with JEDEC-compliant reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to system ground or low-side reference; completes clamping loop during overvoltage events. |
| Cathode | Reverse-biased terminal / protected line connection | Connected to the line being protected (e.g., 64 V rail or signal input); conducts only during reverse overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - enables use in engine control, ADAS, and infotainment modules. |
| Halogen-free & RoHS-compliant (HM3) | Meets IEC 61249-2-21 and JEDEC J-STD-20 requirements - supports green manufacturing and end-of-life compliance without compromising surge robustness. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from load dump or relay coil de-energization without degradation - suitable for 12 V/24 V vehicle electrical systems. |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage stress on downstream components - preserves margin for 75 V-rated MOSFETs and 100 V-input regulators. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without moisture-induced damage - eliminates baking requirement and reduces production cost. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 120 V) on 64 V auxiliary power rails in commercial vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between rail and chassis ground, activated within picoseconds of overvoltage onset. Use Value: Limits rail voltage to ≤103 V during ISO 7637-2 Pulse 5a events, preventing latch-up or gate oxide rupture in downstream PMICs and microcontrollers. |
Use Scenario: Protecting analog front-end inputs of pressure/temperature sensors in factory automation PLC modules exposed to motor drive noise. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across differential sensor lines (e.g., 4–20 mA loop or RS-485 bus), shunting induced surges to ground. Use Value: Maintains signal integrity below 103 V clamping level while adding <1 pF junction capacitance - avoids bandwidth reduction in kHz-range sensor signals. |
| Telecom DC Power Input Protection | Consumer Device USB Power Line Protection |
|
Use Scenario: Safeguarding 64 V PoE++ midspan injectors against lightning-induced surges on Ethernet cable pairs. IC Role / Device Role / Timing Role: Primary-level TVS mounted at DC input connector, coordinated with secondary GDT or MOV stages for staged energy absorption. Use Value: Absorbs 400 W transient energy without failure, enabling compliance with IEC 61000-4-5 Level 4 (4 kV) surge immunity testing. |
Use Scenario: Preventing ESD damage to USB-C port power delivery controllers in portable medical monitors operating from 64 V battery packs. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor placed between VBUS and ground, triggered by ±8 kV contact discharge (IEC 61000-4-2). Use Value: Clamps sub-100 ns ESD events to <103 V, ensuring controller ICs with 12 V absolute maximum ratings remain undamaged. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64AHE3_A/H | Same VWM (64 V), VBR (71.1–78.6 V), VC (103 V), but RoHS-compliant without halogen-free certification (E3 vs HM3). | Lacks halogen-free material declaration; acceptable for commercial but not automotive OEM supply chains requiring full material traceability. | Select SMAJ64AHE3_A/H only if halogen-free compliance is not mandated by customer specification or regional regulation. |
| SMAJ64A-M3/61 | Identical electrical specs and halogen-free RoHS compliance, but packaged in 7″ tape-and-reel with different carrier code (61 vs A/H) and no AEC-Q101 qualification. | Not AEC-Q101 qualified; unsuitable for automotive functional safety-critical subsystems despite matching surge ratings. | Choose SMAJ64A-M3/61 for cost-sensitive industrial applications where automotive qualification is unnecessary. |
Compared with SMAJ64AHM3_A/H, SMAJ64AHE3_A/H omits halogen-free assurance while retaining RoHS compliance, whereas SMAJ64A-M3/61 sacrifices AEC-Q101 validation - making SMAJ64AHM3_A/H the sole option meeting full automotive Tier-1 material and reliability requirements.
Availability
SMAJ64AHM3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom DC input surge suppression, and consumer USB-C PD controller safeguarding requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ64AHM3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where high-energy surge immunity and long-term stability are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ64AHM3_A/H under a 10/1000 μs surge?
The SMAJ64AHM3_A/H has a maximum clamping voltage (VC) of 103 V at 3.9 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring downstream components like 100 V-rated MOSFETs remain within safe operating area. The SMAJ64AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is the SMAJ64AHM3_A/H suitable for automotive applications?
Yes, the SMAJ64AHM3_A/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's official datasheet (Document Number: 88390). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification - making it suitable for under-hood and cabin applications such as engine control units, body electronics, and ADAS power supplies. The SMAJ64AHM3_A/H also meets MSL Level 1 for lead-free reflow compatibility.
What does the "HM3" suffix indicate in SMAJ64AHM3_A/H?
The "HM3" suffix in SMAJ64AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" indicates AEC-Q101 qualification, "M3" confirms halogen-free and RoHS compliance per JEDEC J-STD-20 and IEC 61249-2-21. This distinguishes it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, non-halogen-free) variants. The SMAJ64AHM3_A/H thus satisfies stringent environmental and reliability mandates for automotive Tier-1 suppliers.
How does the SMAJ64AHM3_A/H compare to bidirectional TVS diodes like SMAJ64CA?
The SMAJ64AHM3_A/H is unidirectional and intended for DC line protection where polarity is fixed (e.g., positive rail to ground), offering lower leakage (<1.0 μA) and tighter VBR tolerance than bidirectional counterparts. In contrast, SMAJ64CA provides symmetrical clamping for AC or floating lines but exhibits higher leakage and reduced precision in breakdown threshold. For 64 V DC systems, SMAJ64AHM3_A/H delivers superior standoff stability and lower power loss - a key advantage in always-on automotive modules.
What is the thermal resistance profile of the SMAJ64AHM3_A/H?
The SMAJ64AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal. These values define its ability to dissipate surge energy without exceeding the 150 °C maximum junction temperature. Proper PCB layout - including adequate copper pour and thermal vias - is essential to maintain these ratings in high-duty-cycle applications. The SMAJ64AHM3_A/H's RθJL enables efficient heat transfer to the board during short-duration pulses.
SMAJ64AHM3_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:
- 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/H FAQ
1.How can I place an order for SMAJ64AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64AHM3_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 SMAJ64AHM3_A/H reliable?
The price and inventory of SMAJ64AHM3_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 SMAJ64AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ64AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64AHM3_A/H?
SMAJ64AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64AHM3_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 SMAJ64AHM3_A/H?
For technical support, including SMAJ64AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ64AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ64AHM3_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 SMAJ64AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ64AHM3_A/H?
All SMAJ64AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64AHM3_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 SMAJ64AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ64AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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