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Vishay General Semiconductor - Diodes Division SMAJ75CAHM3/H
- Part No.:
- SMAJ75CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CAHM3/H.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,442
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Product details
Overview
SMAJ75CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 75 V standoff 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 - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMAJ75CAHM3/H datasheet, SMAJ75CAHM3/H pinout, SMAJ75CAHM3/H application, or SMAJ75CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), MSL Level 1 reflow compatibility, and DO-214AC package thermal performance under repetitive surge conditions.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds VBR, it avalanches into low-impedance conduction to shunt surge energy away from protected circuitry. Its bidirectional structure enables symmetrical clamping in AC-coupled or floating signal paths without polarity constraints.
Thermally, it uses a glass-passivated junction in an SMA (DO-214AC) package with RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (min/max) | 83.3 V / 92.1 V at IT = 1 mA - Ensures consistent avalanche initiation across production lots and temperature range |
| VC @ IPPM | 121 V at 3.3 A - Clamping voltage during 10/1000 μs surge; limits stress on downstream ICs like microcontrollers or transceivers |
| PPPM | 400 W - Peak pulse power handling capability; supports EN 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out |
| IFSM | 40 A - Non-repetitive forward surge current rating; validates robustness against accidental DC overvoltage or lightning-induced ground shifts |
| TJ max. | +150 °C - Junction temperature limit enabling use in under-hood automotive environments and high-ambient industrial enclosures |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard SMT pick-and-place and reflow profiles (peak 260 °C) |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Bidirectional configuration has no polarity marking - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve identical clamping function; no cathode band marking - enables placement without orientation check in automated assembly |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements |
| Halogen-free & RoHS-compliant (HM3) | Meets JESD201 Class 2 whisker resistance and global environmental compliance mandates for Tier 1 automotive supply chains |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 surge immunity up to 4 kV in 2 Ω/12 Ω source impedance configurations with minimal PCB area |
| Low incremental surge resistance | Enables tighter clamping window (VC − VBR ≈ 38 V) to reduce voltage overshoot on sensitive 3.3 V or 5 V logic rails |
| MSL Level 1 (260 °C peak) | Allows single-pass reflow without moisture sensitivity concerns - eliminates baking step in high-volume manufacturing |
Applications
| Automotive Sensor Protection | Industrial PLC Analog Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and MEMS pressure sensors from load dump and inductive switching spikes in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector interface to divert >100 A transients before reaching ASIC-level protection. Use Value: Prevents latch-up or gate oxide damage in automotive-grade microcontrollers by limiting transient voltage to ≤121 V during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding 4–20 mA current loop inputs in programmable logic controllers from field wiring surges and ESD coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on differential analog input stage, working in concert with series current-limiting resistors and filtering capacitors. Use Value: Maintains signal integrity under IEC 61000-4-4 EFT bursts (4 kV) by clamping common-mode transients within 1 ns response time and holding VC < 125 V. |
| Telecom Line Interface | Consumer Power Adapter Output |
|
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE controller ICs against lightning-induced surges on outdoor data lines. IC Role / Device Role / Timing Role: Secondary-level TVS placed after gas discharge tube (GDT) front-end to handle residual fast-rising transients (<100 ns rise time). Use Value: Provides sub-100 ns response and low clamping ratio (VC/VBR ≈ 1.45) to protect 100BASE-TX transformers rated for only 150 V isolation. |
Use Scenario: Suppressing switching noise and output overvoltage faults in USB-C PD and Qi wireless charging adapters. IC Role / Device Role / Timing Role: Output-side transient suppressor across secondary-side DC bus to prevent overvoltage shutdown of synchronous rectifier controllers. Use Value: Withstands repetitive 300 W surges above 78 V (per datasheet derating), ensuring long-term reliability in compact, thermally constrained adapter designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CAHE3/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free requirement (E3 vs HM3) | Acceptable for non-automotive industrial use where halogen-free mandate does not apply | Select SMAJ75CAHE3/H if halogen-free certification is not required and cost optimization is prioritized |
| SMBJ75CAHM3 | Higher 600 W PPPM, larger SMB (DO-214AA) package (5.28 mm × 4.57 mm), same VWM/VC ratings | Better thermal dissipation for high-duty-cycle surge environments; requires larger PCB pad area | Choose SMBJ75CAHM3 when system-level surge testing exceeds 400 W single-pulse limits or sustained surge repetition is expected |
Compared with SMAJ75CAHM3/H, SMAJ75CAHE3/H offers identical protection performance without halogen-free assurance, while SMBJ75CAHM3 delivers higher surge capacity at the cost of increased board space - making SMAJ75CAHM3/H optimal for space-constrained AEC-Q101-compliant designs requiring verified halogen-free materials.
Availability
SMAJ75CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, and telecom line protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ75CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series targets surface-mount transient suppression in automotive, industrial, and communications equipment - engineered for rapid response, repeatable clamping, and seamless integration into automated manufacturing flows.
FAQ
What is the clamping voltage of the SMAJ75CAHM3/H under a 10/1000 μs surge?
The SMAJ75CAHM3/H exhibits a maximum clamping voltage (VC) of 121 V at a peak pulse current (IPPM) of 3.3 A with a 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88390 and reflects worst-case clamping performance across temperature and process variation - critical for validating voltage margins in protected circuits such as 3.3 V or 5 V microcontroller I/O rails.
Is the SMAJ75CAHM3/H suitable for automotive applications?
Yes, the SMAJ75CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets stress test requirements for temperature cycling, humidity bias, and mechanical shock - making SMAJ75CAHM3/H appropriate for engine control, body electronics, and ADAS sensor protection where reliability under harsh conditions is mandatory.
Does the SMAJ75CAHM3/H have polarity markings?
No, the SMAJ75CAHM3/H is a bidirectional TVS diode and carries no cathode band or polarity marking on its SMA (DO-214AC) package. Both terminals are functionally identical, allowing unrestricted orientation during automated placement - a key advantage for high-speed SMT lines and differential signal protection where polarity awareness would complicate layout or assembly.
What is the thermal resistance of the SMAJ75CAHM3/H?
The SMAJ75CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W when mounted on the recommended 0.2" × 0.2" copper pads. These values define its steady-state and transient thermal behavior - essential for calculating junction temperature rise under continuous power dissipation (PD = 3.3 W) or repetitive surge conditions.
How does the HM3 suffix differ from the HE3 suffix in SMAJ75CA variants?
The HM3 suffix on SMAJ75CAHM3/H denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, whereas HE3 indicates RoHS-compliance and AEC-Q101 qualification without halogen-free assurance. Both share identical electrical characteristics and packaging, but SMAJ75CAHM3/H satisfies stricter environmental mandates required by major automotive OEMs and green electronics standards such as IEC 61249-2-21.
SMAJ75CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ75CAHM3/H FAQ
1.How can I place an order for SMAJ75CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CAHM3/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 SMAJ75CAHM3/H reliable?
The price and inventory of SMAJ75CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ75CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CAHM3/H?
SMAJ75CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CAHM3/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 SMAJ75CAHM3/H?
For technical support, including SMAJ75CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CAHM3/H requirements.
6.How does Aetrix verify that SMAJ75CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ75CAHM3/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 SMAJ75CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ75CAHM3/H?
All SMAJ75CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CAHM3/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 SMAJ75CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ75CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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