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Vishay General Semiconductor - Diodes Division SMCJ75CA-M3/9AT
- Part No.:
- SMCJ75CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ75CA-M3/9AT.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,299
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Product details
Overview
SMCJ75CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 121 V at 12.4 A peak pulse current (10/1000 μs), with 75 V standoff voltage and 1500 W peak pulse power dissipation. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ75CA-M3/9AT datasheet, SMCJ75CA-M3/9AT pinout, SMCJ75CA-M3/9AT application, or SMCJ75CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, 121 V max clamping voltage at rated surge, halogen-free RoHS-compliant construction, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA suffix configuration, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive transient stress.
The device meets MSL Level 1 per J-STD-020 with 260 °C peak reflow tolerance and supports operation from −55 °C to +150 °C junction temperature. Its thermal resistance (RθJA = 75 °C/W) and RθJL = 15 °C/W define thermal performance limits when mounted on 8.0 mm × 8.0 mm copper pads per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 75 V - Maximum continuous reverse voltage before clamping begins; defines operating margin below breakdown. |
| Breakdown Voltage (VBR) | 83.3–92.1 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction initiates reliably. |
| Clamping Voltage (VC) | 121 V at 12.4 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; critical for downstream component survival. |
| Peak Pulse Power (PPPM) | 1500 W - Maximum transient energy absorption capacity under standardized 10/1000 μs waveform. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm height; compatible with JEDEC MS-013. |
| Operating Temperature | −55 °C to +150 °C - Full industrial and automotive-grade junction range; enables use in engine control units and motor drives. |
| RoHS Compliance | Halogen-free, RoHS-compliant (M3 suffix) - Meets environmental requirements for commercial and industrial applications without brominated flame retardants. |
Pinout & Package
SMCJ75CA-M3/9AT uses the SMC (DO-214AB) package: a two-terminal surface-mount device with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point in negative half-cycle | One terminal of symmetrical avalanche junction; conducts during reverse-biased surges in either direction. |
| Cathode | Transient current entry point in positive half-cycle | Second terminal of symmetrical junction; identical electrical role to anode in bidirectional configuration; no band marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, and ungrounded circuits without polarity concerns. |
| 1500 W peak pulse power | Supports robust immunity against IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly laid out. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on protected components relative to operating voltage margin. |
| MSL Level 1 rating | Allows single-reflow assembly without moisture sensitivity handling; simplifies manufacturing logistics. |
| Halogen-free (M3 suffix) | Meets strict environmental compliance for export markets and green product initiatives. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V/24 V power rails feeding ECUs, lighting modules, and body controllers against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and LDOs to limit input voltage excursions. Use Value: Withstands 121 V clamping at 12.4 A surge, preventing damage to downstream regulators rated for ≤13.5 V input. | Use Scenario: Shielding analog and digital sensor outputs (e.g., pressure, temperature, position) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential or single-ended signal pairs connected to long cables or connectors. Use Value: Symmetric clamping ensures equal protection for both polarities of fast-rising transients (<1 ns rise time), preserving signal integrity. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Surge suppression on Ethernet PHY interfaces, DSL line drivers, or RS-485 transceivers exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level protection after gas discharge tube (GDT) primary stage; handles residual energy and fast-rising edges. Use Value: 1500 W rating and 121 V clamping enable coordination with upstream GDTs to meet ITU-T K.21 Basic Level requirements. | Use Scenario: Safeguarding microcontroller GPIOs and gate drivers controlling BLDC or stepper motors in washing machines and HVAC systems. IC Role / Device Role / Timing Role: Localized clamp adjacent to motor driver ICs to suppress back-EMF spikes generated during PWM commutation. Use Value: Fast response time and low incremental resistance minimize voltage overshoot during 10–100 ns switching events, reducing MOSFET stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75CA-M3/57T | Lower peak pulse power (600 W), same VWM/VC, SMB package (smaller footprint, higher RθJA) | Less robust for high-energy surges; suitable only for lower-risk consumer interfaces. | Select when board space is constrained and surge threat level is ≤IEC 61000-4-5 Level 2. |
| SMCJ75A-M3/9AT | Unidirectional variant; identical VWM, VBR, VC, and PPPM, but requires correct polarity orientation | Only usable on DC-biased lines with known polarity; unsuitable for AC or floating signals. | Choose only if circuit topology guarantees fixed polarity and layout allows cathode marking verification. |
Compared with SMBJ75CA-M3/57T and SMCJ75A-M3/9AT, the SMCJ75CA-M3/9AT uniquely delivers bidirectional 1500 W surge handling in the SMC footprint-enabling universal placement on mixed-signal or AC-coupled nodes without polarity dependency or derating for energy absorption.
Availability
SMCJ75CA-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom line protection, and consumer appliance motor control requiring stable component supply across production lifecycles.
Supply support for SMCJ75CA-M3/9AT 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and thermal stability are mission-critical.
FAQ
What is the maximum clamping voltage of the SMCJ75CA-M3/9AT under standard test conditions?
The SMCJ75CA-M3/9AT has a maximum clamping voltage (VC) of 121 V when subjected to a 10/1000 μs waveform at 12.4 A peak pulse current. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88394. The clamping voltage directly determines the peak overvoltage stress imposed on protected circuitry during surge events, making it a critical parameter for downstream component survivability in the SMCJ75CA-M3/9AT design.
Is the SMCJ75CA-M3/9AT suitable for automotive applications?
Yes, the SMCJ75CA-M3/9AT is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/9AT variant is commercial-grade and not AEC-Q101 certified. Its −55 °C to +150 °C operating temperature range, MSL Level 1 reflow rating, and robust 1500 W surge capability make it technically suitable for many automotive subsystems-but formal qualification requires the HM3_X ordering code. Always verify compliance status using the full Vishay part number for SMCJ75CA-M3/9AT before deployment in safety-critical automotive functions.
How does the bidirectional configuration of the SMCJ75CA-M3/9AT affect PCB layout?
The SMCJ75CA-M3/9AT has no polarity marking and operates identically in both directions, eliminating the need for orientation checks during automated placement or manual assembly. This simplifies layout by removing cathode band alignment constraints and enabling use on differential pairs, AC-coupled lines, or floating grounds where voltage polarity reverses. Unlike unidirectional variants such as SMCJ75A-M3/9AT, the SMCJ75CA-M3/9AT avoids risk of incorrect installation and supports symmetrical protection schemes without additional routing complexity.
What is the thermal resistance of the SMCJ75CA-M3/9AT, and how does it impact power derating?
The SMCJ75CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per Vishay specification. This value governs steady-state power dissipation limits: at 25 °C ambient, its 6.5 W rated power drops to ~3.3 W at 75 °C ambient. Derating curves in Figure 2 of Document 88394 show linear reduction above 25 °C. For reliable long-term operation, ensure adequate copper area and avoid stacking thermal vias beneath the SMCJ75CA-M3/9AT body to maintain this RθJA.
Can the SMCJ75CA-M3/9AT be used as a direct replacement for the SMCJ75A-M3/9AT?
No-the SMCJ75CA-M3/9AT is bidirectional while the SMCJ75A-M3/9AT is unidirectional, so they are not functionally interchangeable without circuit review. Replacing SMCJ75A-M3/9AT with SMCJ75CA-M3/9AT removes polarity dependency but introduces reverse conduction during normal forward bias, potentially disrupting DC-biased circuits. Conversely, substituting the unidirectional version into a bidirectional node leaves one polarity unprotected. Always validate signal topology and bias conditions before interchanging SMCJ75CA-M3/9AT and SMCJ75A-M3/9AT in existing designs.
SMCJ75CA-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 12.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ75CA-M3/9AT FAQ
1.How can I place an order for SMCJ75CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ75CA-M3/9AT 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 SMCJ75CA-M3/9AT reliable?
The price and inventory of SMCJ75CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ75CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ75CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ75CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ75CA-M3/9AT?
SMCJ75CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ75CA-M3/9AT 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 SMCJ75CA-M3/9AT?
For technical support, including SMCJ75CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ75CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ75CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ75CA-M3/9AT 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 SMCJ75CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ75CA-M3/9AT?
All SMCJ75CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ75CA-M3/9AT, 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 SMCJ75CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ75CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ75CA-M3/9AT Tags
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