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Vishay General Semiconductor - Diodes Division SMAJ64AHM3/I
- Part No.:
- SMAJ64AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64AHM3/I.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,693
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Product details
Overview
SMAJ64AHM3/I 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, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ64AHM3/I datasheet, SMAJ64AHM3/I pinout, SMAJ64AHM3/I application, or SMAJ64AHM3/I equivalent, this part delivers verified AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and surge protection in automotive ECUs and industrial controllers.
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation, it remains high-impedance until transient voltage exceeds VWM (64 V), then avalanches to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at VWM).
Designed for 10/1000 μs surge waveforms, SMAJ64AHM3/I sustains 400 W peak pulse power up to 78 V and derates to 300 W above that threshold. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation at TJ = −55 to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 64 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (Breakdown Voltage) | 71.1–78.6 V at 1 mA - Confirmed avalanche initiation range under standardized test current |
| VC (Clamping Voltage) | 103 V at IPPM = 3.9 A - Peak voltage seen by protected circuit during 10/1000 μs surge |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capability per JEDEC standard waveform |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - Forward surge rating for unidirectional configuration only |
| TJ Range | −55 to +150 °C - Full operational junction temperature range without derating |
| Package | SMA (DO-214AC) - Surface-mount outline with cathode band marking, MSL Level 1, 260 °C reflow compatible |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Reverse-biased terminal / protected line interface | Connected to the line being protected (e.g., 64 V supply rail); band denotes this end |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control, body modules, and ADAS sensors |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for global automotive and industrial manufacturing |
| 400 W peak pulse power (10/1000 μs) | Provides robust protection against ISO 7637-2 pulse 1, 2a, 3a/b and IEC 61000-4-5 surges |
| Low incremental surge resistance | Enables tighter clamping and reduced let-through energy during fast transients |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without pre-baking or special handling |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 64 V battery-fed control modules from load dump and inductive switching spikes in 24 V commercial vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients exceeding 64 V. Use Value: Limits voltage to ≤103 V during 3.9 A surge, preventing damage to downstream DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog output lines of pressure/temperature sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: Clamping device on 0–10 V or 4–20 mA signal path against ESD and field-wiring induced surges. Use Value: Sub-100 ns response time and <1.0 μA leakage preserve signal integrity while blocking >1 kV transients. |
| Telecom DC Power Input Protection | OEM Motor Drive Gate Driver Protection |
|
Use Scenario: Secondary-side overvoltage suppression on −48 V telecom rectifier outputs feeding base station backplanes. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing coupled lightning surges and hot-swap transients on distributed power bus. Use Value: 64 V VWM aligns with −48 V system derating margin; 103 V clamping prevents latch-up in PMICs and FPGAs. |
Use Scenario: Protecting high-side gate driver ICs from Miller-induced voltage spikes during IGBT/MOSFET switching in HVAC inverters. IC Role / Device Role / Timing Role: Local clamping element across gate-source terminals or bootstrap supply rails. Use Value: Fast response and low clamping voltage reduce risk of false turn-on and gate oxide stress during dV/dt events. |
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/I | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification | Limited to commercial-grade industrial and consumer applications, not automotive | Select when halogen-free content and automotive qualification are not required |
| SMAJ64A-M3/5A | Identical electrical and thermal specs; same HM3 halogen-free material; differs only in packaging (13" reel, 7500 pcs) | No functional difference; identical use cases and reliability profile | Choose based on volume procurement needs and assembly line tape/reel compatibility |
Compared with SMAJ64AHM3/I, SMAJ64AHE3/I lacks AEC-Q101 validation and halogen-free certification, limiting its deployment in automotive systems; SMAJ64A-M3/5A offers identical performance but different packaging format - both serve as functionally aligned alternatives where supply chain or qualification requirements differ.
Availability
SMAJ64AHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor signal conditioning, and telecom DC power input protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ64AHM3/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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 compliance, and precise clamping performance are mandatory.
FAQ
What is the clamping voltage of SMAJ64AHM3/I at its rated peak pulse current?
The SMAJ64AHM3/I has a maximum clamping voltage (VC) of 103 V at a peak pulse current (IPPM) of 3.9 A using the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream ICs remain within safe operating voltage margins. The SMAJ64AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMAJ64AHM3/I qualified for automotive applications?
Yes, SMAJ64AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_X" designation and documentation in datasheet revision 09-Jan-2024. This qualification validates its reliability for use in automotive electronic control units, body electronics, and ADAS subsystems under extended temperature cycling, humidity, and mechanical stress conditions. The SMAJ64AHM3/I meets all stress test requirements defined in AEC-Q101 Rev D.
What does the "HM3" suffix indicate in SMAJ64AHM3/I?
The "HM3" suffix in SMAJ64AHM3/I specifies halogen-free, RoHS-compliant construction with matte tin-plated leads, meeting JESD 201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow profile (peak 260 °C). It distinguishes this variant from "E3" (RoHS only) and "HE3" (AEC-Q101 + RoHS) versions - confirming both environmental compliance and automotive-grade reliability in a single package. The "I" denotes 13-inch tape-and-reel packaging (7500 pcs).
How does SMAJ64AHM3/I compare to bidirectional variants like SMAJ64CA?
SMAJ64AHM3/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction must be blocked. In contrast, SMAJ64CA is bidirectional, symmetric in both directions, and used in AC-coupled or floating signal paths. Their VWM, VBR, and VC values differ: SMAJ64CA has VWM = 64 V but dual-directional clamping, whereas SMAJ64AHM3/I provides forward conduction capability and higher IFSM (40 A vs. N/A for bidirectional). Selection depends strictly on circuit topology and polarity requirements.
What is the thermal resistance of SMAJ64AHM3/I, and how does it affect PCB layout?
SMAJ64AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. These values assume mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - the minimum recommended layout per Vishay. Deviating from this pad size increases RθJA, raising junction temperature under sustained power dissipation (PD = 3.3 W), potentially triggering thermal runaway during repetitive surges. Layout adherence is essential for maintaining rated 150 °C TJ max.
SMAJ64AHM3/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:
- 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/I FAQ
1.How can I place an order for SMAJ64AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64AHM3/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/I reliable?
The price and inventory of SMAJ64AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ64AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64AHM3/I?
SMAJ64AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64AHM3/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/I?
For technical support, including SMAJ64AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64AHM3/I requirements.
6.How does Aetrix verify that SMAJ64AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ64AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ64AHM3/I?
All SMAJ64AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64AHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ64AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ64AHM3/I Tags
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