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Vishay General Semiconductor - Diodes Division SMAJ75CA-M3/61
- Part No.:
- SMAJ75CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CA-M3/61.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,325
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Product details
Overview
SMAJ75CA-M3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 75 V standoff voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, clamps transients to ≤121 V at 3.3 A peak pulse current, and delivers 400 W peak pulse power (10/1000 μs waveform) - ideal for safeguarding MOSFETs, ICs, and sensor interfaces against inductive switching surges and ESD in industrial and automotive electronics.
For engineers reviewing the SMAJ75CA-M3/61 datasheet, SMAJ75CA-M3/61 pinout, SMAJ75CA-M3/61 application, or SMAJ75CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, SMA (DO-214AC) package compatibility, 150 °C max junction temperature, low leakage (<1 μA at 75 V), and halogen-free RoHS compliance per M3 suffix.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical breakdown and clamping characteristics in forward and reverse directions. Its glass-passivated junction ensures stable VBR tolerance (±5%) and fast response time (<1.0 ns), enabling effective suppression of fast-rising transients such as EFT (IEC 61000-4-4) and lightning-induced surges (IEC 61000-4-5).
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above 78 V, consistent with its 75 V VWM. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, supporting reliable operation under repetitive surge conditions at ambient temperatures up to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 72 V nominal DC bus or 54 V automotive systems. |
| VBR (min/max) | 83.3 V / 92.1 V at 1 mA - tight breakdown window ensures predictable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 121 V at 3.3 A - clamping voltage limits downstream component stress during 400 W transient events; enables use with 100 V-rated MOSFETs. |
| IPPM | 3.3 A - peak pulse current capacity for 10/1000 μs waveform; sufficient to absorb typical load-dump energy in 12 V/24 V vehicle subsystems. |
| PPPM | 400 W - peak pulse power rating (derated to 300 W above 78 V); supports high-energy surge immunity per ISO 7637-2 Pulse 5a. |
| TJmax | 150 °C - maximum junction temperature; allows operation in under-hood automotive environments with proper PCB thermal relief. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak), halogen-free and RoHS-compliant per M3 suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 (cathode band side not marked) | Bidirectional symmetry means no polarity marking; either terminal serves as anode or cathode depending on transient polarity. |
| Cathode | Terminal 2 (opposite end) | No functional distinction from Anode in bidirectional configuration; terminals are electrically interchangeable for surge conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against severe ISO 7637-2 load-dump and IEC 61000-4-5 surges without external series impedance. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on protected ICs or MOSFETs while maintaining margin above system operating voltage. |
| Fast response time <1.0 ns | Clamps transients before they propagate through sensitive circuitry - critical for protecting high-speed sensor interfaces and microcontroller I/O. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising surge performance. |
| AEC-Q101 qualification option | Available in HM3 variant (SMAJ75CAHM3_X); this SMAJ75CA-M3/61 is commercial-grade but shares identical electrical specs and package. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V CAN node power rails and I/O lines from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to shunt surge energy to ground before reaching CAN transceiver or MCU. Use Value: Limits voltage excursion to ≤121 V during 400 W surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and 100 V-rated power FETs. |
Use Scenario: Shielding analog outputs (4–20 mA) and digital I/O (RS-485, SPI) of PLC analog modules from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Primary overvoltage clamp on signal line pairs, used alongside series current-limiting resistors and filtering capacitors. Use Value: Sub-1 ns response ensures clamping occurs before transient propagates into precision op-amps or ADC front-ends, preserving measurement integrity. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
|
Use Scenario: Secondary-side overvoltage protection on 12 V/19 V output rails of AC-DC adapters subjected to lightning-induced surges on connected devices. IC Role / Device Role / Timing Role: Final-stage TVS placed after bulk capacitor and before USB-PD or barrel-jack output connectors. Use Value: 75 V VWM provides 25% headroom above 19 V nominal, while 121 V clamping prevents damage to downstream USB controllers or charging ICs. |
Use Scenario: Surge protection on -48 V DC telecom power feeds entering base station equipment cabinets exposed to outdoor grounding potential differences. IC Role / Device Role / Timing Role: Bidirectional clamp on DC input pair, referenced to chassis ground, handling both positive and negative polarity surges. Use Value: Symmetrical clamping ensures equal protection regardless of surge polarity; 150 °C TJmax supports operation in sealed, high-temperature enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CA-E3/61 | Same electrical specs and SMA package; RoHS-compliant but contains brominated flame retardants (not halogen-free). | Acceptable for commercial/industrial use where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and assembly process. |
| SMAJ75CAHM3_A | Identical electrical and mechanical specs; adds AEC-Q101 qualification and extended temperature validation (-55 °C to +150 °C). | Required for automotive under-hood or safety-critical ECUs; not necessary for consumer or non-automotive industrial use. | Choose only if automotive qualification is contractually required; otherwise SMAJ75CA-M3/61 offers full performance at lower cost. |
Compared with SMAJ75CA-E3/61, the SMAJ75CA-M3/61 provides halogen-free compliance without sacrificing surge rating or thermal performance; versus SMAJ75CAHM3_A, it omits AEC-Q101 validation - making it optimal for cost-sensitive, non-automotive applications requiring environmental compliance and proven 400 W transient immunity.
Availability
SMAJ75CA-M3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, consumer power adapter input stages, and telecom DC power feeds requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance.
Supply support for SMAJ75CA-M3/61 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 optimization.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, fast response, and consistent clamping are critical.
FAQ
What is the clamping voltage of the SMAJ75CA-M3/61 under maximum rated surge current?
The SMAJ75CA-M3/61 clamps to a maximum of 121 V at its rated peak pulse current of 3.3 A (10/1000 μs waveform). This value is measured per JEDEC standards and reflects worst-case conduction under full 400 W surge conditions. The clamping voltage remains stable across temperature and lifetime, ensuring predictable protection margins for downstream components in the SMAJ75CA-M3/61 design.
Is the SMAJ75CA-M3/61 suitable for automotive applications?
The SMAJ75CA-M3/61 meets all electrical and package specifications required for automotive use - including 150 °C junction rating, MSL Level 1, and robust surge capability - but is certified as commercial grade (M3 suffix). For AEC-Q101-qualified designs, the SMAJ75CAHM3_A variant must be selected. The SMAJ75CA-M3/61 itself is widely deployed in non-safety-critical automotive subsystems like infotainment power rails where qualification is not mandated.
How does the bidirectional nature of the SMAJ75CA-M3/61 affect its circuit placement?
Because the SMAJ75CA-M3/61 is bidirectional, it has no polarity marking and can be placed across any two nodes requiring symmetrical overvoltage protection - such as differential signal lines (RS-485), DC power/return pairs, or AC-coupled paths. Unlike unidirectional TVS diodes, the SMAJ75CA-M3/61 eliminates orientation errors during assembly and ensures identical clamping behavior regardless of transient polarity, simplifying layout and reducing BOM complexity.
What is the thermal resistance of the SMAJ75CA-M3/61, and how does it impact PCB layout?
The SMAJ75CA-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperatures during repetitive surges, designers should provide adequate copper area and avoid excessive trace length between the SMAJ75CA-M3/61 and ground plane. No heatsink is required for single-event protection, but thermal relief improves reliability under sustained surge duty cycles.
Does the SMAJ75CA-M3/61 meet international surge immunity standards?
Yes - the SMAJ75CA-M3/61's 400 W peak pulse power (10/1000 μs), sub-1 ns response, and low clamping ratio enable compliance with key standards including IEC 61000-4-5 (lightning surge), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive transients). Its performance is validated in reference circuits documented by Vishay for these standards, and the SMAJ75CA-M3/61 is routinely specified in designs targeting EN 55032, CISPR 25, and UL 60950-1 system-level certification.
SMAJ75CA-M3/61 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ75CA-M3/61 FAQ
1.How can I place an order for SMAJ75CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CA-M3/61 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 SMAJ75CA-M3/61 reliable?
The price and inventory of SMAJ75CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ75CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CA-M3/61?
SMAJ75CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CA-M3/61 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 SMAJ75CA-M3/61?
For technical support, including SMAJ75CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ75CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ75CA-M3/61 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 SMAJ75CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ75CA-M3/61?
All SMAJ75CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CA-M3/61, 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 SMAJ75CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ75CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75CA-M3/61 Tags
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