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Vishay General Semiconductor - Diodes Division SMAJ75AHM3_A/I
- Part No.:
- SMAJ75AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75AHM3_A/I.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,168
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Product details
Overview
SMAJ75AHM3_A/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 DC power rails and signal lines. It features a 75 V stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, 121 V maximum clamping voltage (VC) at 3.3 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 SMAJ75AHM3_A/I datasheet, SMAJ75AHM3_A/I pinout, SMAJ75AHM3_A/I application, or SMAJ75AHM3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at 75 V), while the low incremental surge resistance enables rapid energy absorption during ESD or inductive switching events.
The SMAJ75AHM3_A/I is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports MSL Level 1 moisture sensitivity, and achieves thermal resistance of 120 °C/W (junction-to-ambient) under standard PCB mounting conditions - confirming suitability for compact, thermally constrained layouts without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 83.3 V / 92.1 V at 1 mA - tight breakdown window ensures predictable turn-on across temperature |
| VC @ IPPM | 121 V at 3.3 A - clamping voltage limits downstream stress during 10/1000 μs transients |
| PPPM | 400 W - peak pulse power handling capability per standard 10/1000 μs waveform |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage preserves system efficiency in standby modes |
| TJ max | +150 °C - enables operation in under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline compatible with J-STD-020 reflow profiles |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band on one end; terminals solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes conduction path during overvoltage event |
| Cathode | High-side connection point | Connected to protected line (e.g., +12 V rail); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global OEM supply chains |
| 400 W peak pulse power | Withstands repetitive 10/1000 μs surges up to 0.01% duty cycle without degradation |
| MSL Level 1 | Unlimited floor life; no baking required prior to reflow assembly |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage under thermal cycling |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V and 24 V battery-fed ECUs from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp transients above 75 V. Use Value: Limits voltage seen by downstream regulators and microcontrollers to ≤121 V during ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Parallel-connected clamping device on 4–20 mA or 0–10 V signal lines. Use Value: Prevents latch-up or damage to precision op-amps and ADC inputs during field-wiring ESD events. |
| DC-DC Converter Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Shielding buck converter inputs against back-EMF from relay coils or solenoids. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing inductive kickback before it reaches controller ICs. Use Value: Maintains 75 V operational margin while clamping spikes to 121 V within nanoseconds. | Use Scenario: Protecting high-side and low-side gate drivers in BLDC motor inverters. IC Role / Device Role / Timing Role: Localized TVS on gate drive traces to suppress Miller-induced voltage overshoot. Use Value: Prevents false turn-on and gate oxide breakdown by limiting transient excursions to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75AHE3_A/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial/industrial use where automotive qualification is not required | Select when halogen-free content or automotive qualification is not mandated |
| SMBJ75A-M3/5A | Higher 600 W PPPM rating; SMB package (DO-214AA), larger footprint and higher RθJA (100 °C/W) | Better surge handling but requires more board area; less suitable for space-constrained automotive modules | Choose when higher pulse power margin is critical and layout allows SMB footprint |
Compared with SMAJ75AHM3_A/I, SMAJ75AHE3_A/I offers identical clamping performance without halogen-free or AEC-Q101 assurance, while SMBJ75A-M3/5A delivers greater surge robustness at the cost of larger size and reduced thermal efficiency in dense layouts.
Availability
SMAJ75AHM3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input safeguarding requiring stable component supply across production lifecycles.
Supply support for SMAJ75AHM3_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 and automotive-grade validation.
The SMAJ series is engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMAJ75AHM3_A/I at its rated peak pulse current?
The SMAJ75AHM3_A/I has a maximum clamping voltage (VC) of 121 V at its specified peak pulse current of 3.3 A, measured using the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in Vishay's Document Number 88390, page 2.
Is SMAJ75AHM3_A/I qualified for automotive applications?
Yes, SMAJ75AHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix in its part number - denoting halogen-free, RoHS-compliant construction with full automotive reliability testing. This qualification covers temperature cycling, humidity testing, and mechanical shock per AEC standards.
What does the "_A/I" suffix mean in SMAJ75AHM3_A/I?
The "_A/I" suffix in SMAJ75AHM3_A/I specifies packaging: "A" denotes tape-and-reel format, and "I" indicates 13-inch diameter reels containing 7500 units. This matches Vishay's ordering convention in Document Number 88390, page 3, under "ORDERING INFORMATION".
Can SMAJ75AHM3_A/I be used in bidirectional configurations?
No, SMAJ75AHM3_A/I is unidirectional only, as confirmed by its "A" suffix (vs. "CA" for bidirectional variants). Its cathode band marks polarity, and it conducts only during reverse overvoltage - making it unsuitable for AC or symmetrical transient suppression without external circuitry.
What is the thermal resistance of SMAJ75AHM3_A/I under standard mounting conditions?
SMAJ75AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Thermal Characteristics table (Document Number 88390, page 3). This value assumes no additional heatsinking.
SMAJ75AHM3_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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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)
SMAJ75AHM3_A/I FAQ
1.How can I place an order for SMAJ75AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75AHM3_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 SMAJ75AHM3_A/I reliable?
The price and inventory of SMAJ75AHM3_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 SMAJ75AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ75AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75AHM3_A/I?
SMAJ75AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75AHM3_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 SMAJ75AHM3_A/I?
For technical support, including SMAJ75AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ75AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ75AHM3_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 SMAJ75AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ75AHM3_A/I?
All SMAJ75AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75AHM3_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 SMAJ75AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ75AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75AHM3_A/I Tags
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