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Vishay General Semiconductor - Diodes Division SMCJ20CA-M3/9AT
- Part No.:
- SMCJ20CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CA-M3/9AT.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,137
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Product details
Overview
SMCJ20CA-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 1500 W peak pulse power with a 10/1000 µs waveform, 32.4 V maximum clamping voltage at 46.3 A peak pulse current, and 20 V stand-off voltage - deployed for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ20CA-M3/9AT datasheet, SMCJ20CA-M3/9AT pinout, SMCJ20CA-M3/9AT application, or SMCJ20CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, 20 V working voltage, low incremental surge resistance, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional design, enabling protection of AC-coupled or differential signal paths without polarity sensitivity. It features a glass-passivated junction for stable breakdown behavior and meets MSL Level 1 per J-STD-020 with 260 °C peak reflow tolerance.
Clamping occurs within picoseconds of transient onset, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), supporting reliable operation up to 150 °C junction temperature under repetitive surge conditions when mounted on 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains high-energy lightning or ESD-induced surges without failure |
| Stand-off Voltage (VWM) | 20 V - blocks normal operating voltages while remaining non-conductive |
| Max Clamping Voltage (VC) | 32.4 V at 46.3 A - limits downstream voltage stress during transient events |
| Breakdown Voltage (VBR) | 22.2–24.5 V at 1 mA - defines precise conduction threshold for bidirectional clamping |
| Operating Temperature Range | −55 °C to +150 °C - supports under-hood automotive and industrial ambient environments |
| Package | SMC (DO-214AB) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
| Compliance | Halogen-free, RoHS-compliant, JESD201 Class 2 whisker tested - meets environmental and reliability requirements for commercial-grade production |
Pinout & Package
SMCJ20CA-M3/9AT uses the SMC (DO-214AB) package: a surface-mount, molded plastic case with two terminals and no polarity marking (bidirectional configuration). Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H), with matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | One terminal of symmetrical PN junction - conducts during positive or negative overvoltage |
| Cathode | Transient current exit (reverse bias) | Second terminal of symmetrical PN junction - identical electrical role to Anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded circuits without polarity concerns |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surge (4 kV/2 Ω) and ISO 7637-2 pulse 1/2/5a in automotive systems |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during clamping - critical for safeguarding 24 V logic and gate drivers |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced popcorn failure |
| Halogen-free construction | Meets automotive OEM material restrictions (e.g., GMW3172, Ford WSS-M99P1111-A) and reduces toxic fume risk during board repair |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails feeding body control modules, lighting drivers, and LIN bus transceivers against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across input terminals upstream of DC-DC converters and LDOs. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or gate oxide damage in downstream 36 V-rated regulators and microcontrollers. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops, 0–10 V sensors) from ESD and cable discharge events in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional shunt protector placed between signal line and ground, with no polarity dependency. Use Value: Maintains signal integrity by clamping ±32.4 V transients while adding <1 pF junction capacitance at zero bias - negligible impact on loop bandwidth. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Inputs |
Use Scenario: Safeguarding Ethernet PHY interfaces, PoE injectors, and DSL line drivers exposed to induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Secondary-level TVS on secondary-side DC rails and data line pairs, coordinated with primary GDT/MOV stages. Use Value: Provides fast-response clamping (sub-nanosecond) to complement slower primary protectors, reducing let-through energy to <10 mJ. | Use Scenario: Suppressing commutation spikes generated by brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Across-motor terminals or across H-bridge supply rails to absorb inductive kickback. Use Value: Handles repetitive 46.3 A pulses at 20 °C ambient without derating - extends MOSFET lifetime and eliminates need for snubber RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-M3/57T | Lower peak pulse power (600 W), same VWM (20 V), SMB package (smaller footprint, higher RθJA) | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy surges in space-constrained consumer designs | Select only if board area is critical and surge threat level is ≤Level 2 |
| SMCJ20A-M3/9AT | Unidirectional version; same VWM, VC, and PPPM but requires correct polarity orientation during placement | Cannot protect AC or floating signals; requires cathode band alignment and adds layout verification step | Choose only when circuit topology guarantees consistent polarity and grounding scheme allows unidirectional use |
Compared with SMBJ20CA-M3/57T and SMCJ20A-M3/9AT, the SMCJ20CA-M3/9AT delivers full 1500 W bidirectional clamping in the industry-standard SMC footprint - making it the preferred choice for automotive and industrial applications requiring robust, polarity-agnostic surge immunity without PCB redesign.
Availability
SMCJ20CA-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line card surge protection, and consumer appliance motor drive inputs requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ20CA-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, power efficiency, and automotive qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where sustained surge immunity and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of SMCJ20CA-M3/9AT at its rated peak pulse current?
The SMCJ20CA-M3/9AT has a maximum clamping voltage (VC) of 32.4 V at 46.3 A peak pulse current (IPPM), measured using a 10/1000 µs waveform. This value ensures downstream components see voltage limited to ≤32.4 V during surge events, directly supporting 24 V system robustness. The SMCJ20CA-M3/9AT maintains this clamping performance across its full operating temperature range.
Is SMCJ20CA-M3/9AT suitable for automotive applications?
Yes, the SMCJ20CA-M3/9AT is halogen-free, RoHS-compliant, and qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes. While the -M3/9AT variant is commercial grade, its 1500 W surge rating, −55 °C to +150 °C operating range, and MSL Level 1 reflow compatibility make it widely adopted in automotive subsystems such as body electronics and infotainment power rails. For certified automotive use, specify SMCJ20CA-HM3_X.
How does the bidirectional design of SMCJ20CA-M3/9AT affect circuit layout?
The SMCJ20CA-M3/9AT has no polarity marking and functions identically in both directions, eliminating cathode/anode orientation constraints during PCB placement. This simplifies layout for AC-coupled interfaces, differential buses (e.g., RS-485), or floating grounds. Unlike unidirectional variants such as SMCJ20A-M3/9AT, the SMCJ20CA-M3/9AT avoids misplacement risk and enables reuse across signal path topologies without redesign.
What is the thermal resistance of SMCJ20CA-M3/9AT, and how does it impact power dissipation?
The SMCJ20CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. When mounted on 8.0 mm × 8.0 mm copper pads, it safely dissipates 6.5 W continuously at TA = 50 °C. These values inform heatsinking decisions: minimal pad copper suffices for transient-only duty, but sustained surge repetition requires attention to board-level thermal mass to avoid exceeding 150 °C junction limit.
Does SMCJ20CA-M3/9AT meet UL recognition standards?
Yes, the SMCJ20CA-M3/9AT carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766 covering both unidirectional and bidirectional configurations. This certification validates its suitability for use in safety-critical surge protection circuits in North American equipment, including industrial controls and telecom infrastructure where third-party safety compliance is mandated.
SMCJ20CA-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- 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)
SMCJ20CA-M3/9AT FAQ
1.How can I place an order for SMCJ20CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CA-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 SMCJ20CA-M3/9AT reliable?
The price and inventory of SMCJ20CA-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 SMCJ20CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ20CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CA-M3/9AT?
SMCJ20CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CA-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 SMCJ20CA-M3/9AT?
For technical support, including SMCJ20CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ20CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ20CA-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 SMCJ20CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ20CA-M3/9AT?
All SMCJ20CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CA-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 SMCJ20CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ20CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20CA-M3/9AT Tags
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