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Vishay General Semiconductor - Diodes Division SMAJ75CA-M3/5A
- Part No.:
- SMAJ75CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CA-M3/5A.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,271
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Product details
Overview
SMAJ75CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 75 V standoff voltage (VWM), 83.3–92.1 V breakdown range (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 rails.
For engineers reviewing the SMAJ75CA-M3/5A datasheet, SMAJ75CA-M3/5A pinout, SMAJ75CA-M3/5A application, or SMAJ75CA-M3/5A equivalent, this device is selected for robust ESD and surge immunity in bidirectional DC lines where low-leakage (<1.0 μA at VWM), fast response (<1 ps), and AEC-Q101-compliant reliability are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, enabling consistent clamping performance under repetitive 10/1000 μs transients up to 0.01% duty cycle.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its M3 suffix denotes halogen-free, RoHS-compliant construction with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 75 V - Maximum continuous reverse voltage before significant leakage; defines safe operating DC bias level. |
| VBR (Breakdown Voltage) | 83.3–92.1 V at 1 mA - Voltage at which device transitions into avalanche conduction; ensures reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 121 V at IPPM = 3.3 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capability with 10/1000 μs waveform; supports IEC 61000-4-5 Level 3/4 compliance testing. |
| IDRM (Max Reverse Leakage) | <1.0 μA at 75 V - Minimal standby power loss and signal integrity impact in high-impedance sensing or communication lines. |
| TJmax | 150 °C - Enables operation in under-hood automotive or industrial environments without derating below full power. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly; meets UL 94 V-0 flammability rating. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; no band marking required. |
| Case (body) | Non-electrical mechanical interface | Thermally conductive plastic body with 120 °C/W RθJA; requires minimum 0.2" × 0.2" copper pad per lead for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 combination wave surges up to 1 kV/500 A without degradation. |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes overvoltage stress on protected ICs - critical for 75 V-rated power rails feeding 80 V-tolerant controllers. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance requirements without compromising surge robustness. |
| AEC-Q101 qualified option available | Supports automotive-grade qualification path via HM3 suffix variants; base M3 version is commercial-grade but built on same die/process. |
| MSL Level 1 (260 °C reflow) | Allows single-pass lead-free reflow without moisture sensitivity concerns - eliminates baking step in SMT line. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V/24 V battery-supplied ECUs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across input rail prior to DC-DC converter or LDO. Use Value: Limits transient excursions to ≤121 V, preventing damage to 36 V-input regulators and microcontrollers. |
Use Scenario: 4–20 mA current loop or RS-485 bus lines interfacing with field sensors in factory automation. IC Role / Device Role / Timing Role: Line-side TVS connected between signal pair and ground to shunt induced lightning-induced surges. Use Value: Sub-1 ns response ensures clamping occurs before transceiver ICs experience destructive overvoltage. |
| Consumer Power Adapter Input Stage | Telecom DC Feeder Protection |
|
Use Scenario: Secondary-side 75 V DC output of offline SMPS powering USB-PD or PoE controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across output capacitor to absorb switching noise and external surges. Use Value: 1.0 μA max leakage avoids loading regulation feedback network while maintaining tight output tolerance. |
Use Scenario: -48 V DC telecom feeder lines entering remote radio units or base station cabinets. IC Role / Device Role / Timing Role: Bidirectional suppressor bridging feed line to chassis ground to divert common-mode surges. Use Value: Symmetric VBR ensures equal clamping for positive and negative transients - essential for bipolar DC systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CA-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for commercial-grade designs where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirement; identical PCB layout and thermal performance. |
| SMBJ75CA-M3 | Higher 600 W PPPM, larger SMB (DO-214AA) package, 135 V VC at 4.4 A. | Better suited for higher-energy threats (e.g., IEC 61000-4-5 Level 4), but requires larger board area. | Choose when surge margin must exceed 400 W and board space allows SMB footprint. |
Compared with SMAJ75CA-E3/5A, the M3 variant adds halogen-free compliance without sacrificing performance; versus SMBJ75CA-M3, SMAJ75CA-M3/5A trades 50% lower surge rating for 30% smaller footprint - ideal for space-constrained 75 V rail protection.
Availability
SMAJ75CA-M3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom DC feeders, and consumer power adapters requiring stable component supply and long-term manufacturability.
Supply support for SMAJ75CA-M3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for high-reliability transient suppression in compact surface-mount formats, targeting automotive, industrial, and communications systems where bidirectional surge immunity and AEC-Q101 readiness are essential.
FAQ
What is the clamping voltage of SMAJ75CA-M3/5A at its rated peak pulse current?
The SMAJ75CA-M3/5A has 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 under standardized test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The SMAJ75CA-M3/5A maintains this clamping performance consistently due to its glass-passivated junction and low dynamic impedance.
Is SMAJ75CA-M3/5A suitable for automotive applications?
SMAJ75CA-M3/5A is halogen-free and RoHS-compliant, and shares the same die and process as AEC-Q101-qualified variants (e.g., SMAJ75CA-HM3). While the M3 suffix itself denotes commercial-grade qualification, its construction, thermal rating (150 °C TJmax), and surge robustness make it widely deployed in non-safety-critical automotive modules. For formal AEC-Q101 compliance, specify the HM3 suffix version of SMAJ75CA-M3/5A.
How does the bidirectional design of SMAJ75CA-M3/5A affect its use in DC circuits?
The bidirectional design of SMAJ75CA-M3/5A allows it to protect both polarities of a DC line without regard to orientation - it conducts symmetrically during positive or negative transients. In a 75 V DC system, this means the SMAJ75CA-M3/5A clamps overvoltages above +121 V and undervoltages below –121 V relative to reference, making it ideal for floating or AC-coupled signal paths and ungrounded power rails where polarity reversal risk exists.
What is the thermal resistance of SMAJ75CA-M3/5A, and how does it impact layout?
SMAJ75CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per lead. This value assumes standard FR-4 PCB with no internal planes. To sustain full 400 W pulse power without exceeding 150 °C junction temperature, designers must ensure adequate copper area and avoid excessive trace length or narrow connections. The SMAJ75CA-M3/5A's RθJL of 30 °C/W further supports heat transfer through leads to large copper pours.
Does SMAJ75CA-M3/5A have polarity markings, and how is it oriented on the PCB?
No - SMAJ75CA-M3/5A is a bidirectional TVS and carries no cathode band or polarity marking. Its SMA (DO-214AC) package has symmetrical terminals, meaning either end may connect to line or ground. This eliminates orientation errors during automated placement and simplifies layout for differential or floating protection schemes. The SMAJ75CA-M3/5A functions identically regardless of mounting direction.
SMAJ75CA-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ75CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CA-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ75CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ75CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CA-M3/5A?
SMAJ75CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CA-M3/5A 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-M3/5A?
For technical support, including SMAJ75CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ75CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ75CA-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ75CA-M3/5A?
All SMAJ75CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CA-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ75CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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