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Vishay General Semiconductor - Diodes Division SMAJ64CAHM3_A/I
- Part No.:
- SMAJ64CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64CAHM3_A/I.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,546
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Product details
Overview
SMAJ64CAHM3_A/I from Vishay General Semiconductor is a bidirectional 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, and 400 W peak pulse power (10/1000 μs waveform). It is widely deployed to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power systems.
For engineers reviewing the SMAJ64CAHM3_A/I datasheet, SMAJ64CAHM3_A/I pinout, SMAJ64CAHM3_A/I application, or SMAJ64CAHM3_A/I equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 64 V), but triggers into low-impedance conduction when transients exceed its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns).
The SMAJ64CAHM3_A/I is rated for repetitive 10/1000 μs surge pulses at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W - confirming suitability for surface-mount PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping onset |
| VBR (min/max) | 71.1 V / 78.6 V at 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across temperature and unit variation |
| VC @ IPPM | 103 V at 3.9 A - clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected downstream circuitry |
| PPPM | 400 W - peak pulse power handling capability; enables suppression of high-energy transients like ISO 7637-2 Pulse 1/2a/5a in automotive systems |
| IFSM | 40 A - non-repetitive forward surge rating (8.3 ms half-sine); supports unidirectional surge tolerance where applicable |
| TJ max | +150 °C - maximum junction temperature; allows operation in under-hood automotive environments and industrial enclosures |
| Package | SMA (DO-214AC) - standardized surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with J-STD-020 reflow profiles |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 per J-STD-020, peak reflow temperature 260 °C. Bidirectional configuration has no polarity marking; both terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals serve identical roles in bidirectional clamping; no cathode band marking; layout requires no orientation check during placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and infotainment modules |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-20E and IEC 61249-2-21 requirements; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 31.9 V) and lower let-through energy compared to higher-RSURGE TVS devices |
| 400 W peak pulse power (≤78 V) | Supports IEC 61000-4-5 Level 3 (2 kV line-to-line, 4 kV line-to-earth) and ISO 16750-2 Load Dump simulation without derating |
| Fast response time (<1 ns) | Clamps transients before they propagate through PCB traces or IC input structures - critical for protecting high-speed sensor interfaces and microcontroller GPIOs |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed at power entry point, clamping surges before they reach LDOs and MCU power rails. Use Value: Withstands 400 W pulses and maintains VC ≤ 103 V, ensuring downstream regulators remain within absolute maximum ratings during ISO 16750-2 Test 4a/b. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: Bidirectional clamp on differential signal pair (e.g., 4–20 mA loop or RS-485 bus), suppressing ESD and inductive kickback. Use Value: Symmetrical clamping prevents signal inversion or latch-up; <1 μA leakage at 64 V avoids DC offset errors in precision measurement circuits. |
| Consumer Power Adapter Interfaces | Telecom Line Card Surge Protection |
|
Use Scenario: Input-stage protection for USB-C PD adapters exposed to mains-borne surges and hot-plug transients. IC Role / Device Role / Timing Role: Primary-level TVS on AC-DC rectifier output or secondary-side DC bus, absorbing energy from MOV failure or transformer flyback spikes. Use Value: 120 °C/W RθJA allows thermal management via standard 5 mm² copper pads - no heatsink required for intermittent surge duty. |
Use Scenario: Front-end protection for Ethernet PHYs and DSL line drivers subjected to lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Bidirectional clamp on line transformer secondary windings or common-mode choke outputs. Use Value: 103 V clamping voltage limits stress on PHY ESD structures; AEC-Q101 qualification correlates with extended lifetime under repeated surge stress in field-deployed equipment. |
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/I | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free formulation | Acceptable for commercial/industrial use where halogen-free material is not mandated by OEM spec | Select SMAJ64CAHE3_A/I if halogen content is unrestricted and cost optimization is prioritized |
| SMBJ64CAHM3_A/I | Same VWM/VBR/VC, but SMB (DO-214AA) package - 20% larger footprint, 50% higher PPPM (600 W) | Better suited for high-reliability telecom or rail applications requiring >400 W surge margin | Choose SMBJ64CAHM3_A/I only when board space permits and 600 W rating is explicitly required by system-level surge test plan |
Compared with SMAJ64CAHM3_A/I, the HE3 variant trades halogen-free compliance for slightly lower cost while maintaining identical AEC-Q101 qualification; the SMBJ variant offers higher surge capacity in a larger package but increases PCB area and may require layout revision.
Availability
SMAJ64CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom line card prototyping requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ64CAHM3_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 performance.
The SMAJ series was engineered for high-volume surface-mount transient protection in automotive, industrial, and consumer power systems - balancing compact size, AEC-Q101 compliance, and repeatable clamping performance under real-world surge conditions.
FAQ
What does the "HM3" suffix indicate in SMAJ64CAHM3_A/I?
The "HM3" suffix in SMAJ64CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms the device meets automotive-grade reliability standards while using environmentally compliant materials - critical for Tier 1 automotive suppliers and medical-grade industrial designs requiring strict substance restrictions.
Is SMAJ64CAHM3_A/I unidirectional or bidirectional?
SMAJ64CAHM3_A/I is a bidirectional TVS diode, as indicated by the "CA" suffix. It provides symmetrical clamping in both polarities, making it ideal for AC-coupled signal lines, transformer-isolated interfaces, and applications where voltage polarity reversal is possible - unlike unidirectional variants (e.g., SMAJ64A) that require correct cathode orientation.
What is the maximum clamping voltage for SMAJ64CAHM3_A/I under surge conditions?
The maximum clamping voltage for SMAJ64CAHM3_A/I is 103 V at 3.9 A peak pulse current (10/1000 μs waveform). This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events and is verified per ANSI/IEEE C62.35 standards - essential for validating margin against downstream IC absolute maximum ratings.
Can SMAJ64CAHM3_A/I be used in place of SMAJ64A in an existing design?
No - SMAJ64CAHM3_A/I is bidirectional while SMAJ64A is unidirectional. Substituting them without circuit review risks improper clamping during negative transients or reverse-bias leakage issues. SMAJ64CAHM3_A/I requires symmetric placement with no polarity dependency, whereas SMAJ64A must be oriented with cathode toward the protected node's positive rail.
Does SMAJ64CAHM3_A/I meet automotive qualification standards?
Yes, SMAJ64CAHM3_A/I is AEC-Q101 qualified, as confirmed in Vishay's ordering information and datasheet notes. This certification covers stress tests including HTGB, H3TRB, TC, and ESD, validating its suitability for automotive powertrain, body electronics, and ADAS applications where component failure could impact vehicle safety or function.
SMAJ64CAHM3_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:
- -
- 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/I FAQ
1.How can I place an order for SMAJ64CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64CAHM3_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 SMAJ64CAHM3_A/I reliable?
The price and inventory of SMAJ64CAHM3_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 SMAJ64CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ64CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64CAHM3_A/I?
SMAJ64CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64CAHM3_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 SMAJ64CAHM3_A/I?
For technical support, including SMAJ64CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ64CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ64CAHM3_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 SMAJ64CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ64CAHM3_A/I?
All SMAJ64CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64CAHM3_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 SMAJ64CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ64CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ64CAHM3_A/I Tags
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