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Vishay General Semiconductor - Diodes Division SMCJ43CA-M3/9AT
- Part No.:
- SMCJ43CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43CA-M3/9AT.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,377
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Product details
Overview
SMCJ43CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features 43 V standoff voltage (VWM), 69.4 V maximum clamping voltage (VC) at 21.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ43CA-M3/9AT datasheet, SMCJ43CA-M3/9AT pinout, SMCJ43CA-M3/9AT application, or SMCJ43CA-M3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification eligibility, and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads.
Technical Context
The SMCJ43CA-M3/9AT operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both polarities due to its bidirectional construction. Its breakdown voltage (VBR) is specified between 47.8 V and 52.8 V at 1 mA test current, with temperature coefficient of 0.102 %/°C - enabling stable transient suppression across -55 °C to +150 °C operating range.
It meets J-STD-020 MSL Level 1 moisture sensitivity, supports lead-free reflow up to 260 °C peak, and exhibits <1 μA reverse leakage at VWM. The device is halogen-free and RoHS-compliant (M3 suffix), with matte tin-plated leads qualified per JESD 201 Class 2 whisker test.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - ensures reliable avalanche conduction onset within defined tolerance |
| VC @ IPPM | 69.4 V at 21.6 A - limits downstream voltage stress during 10/1000 µs transients |
| PPPM | 1500 W - handles high-energy surges such as ISO 7637-2 Pulse 1/2a/5a in automotive systems |
| TJ max | +150 °C - supports operation in under-hood environments and enclosed industrial enclosures |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
| Leakage ID | ≤1.0 μA at 43 V - minimizes standby power loss in always-on circuits |
Pinout & Package
SMCJ43CA-M3/9AT uses the standard SMC (DO-214AB) package: two-terminal, non-polarized bidirectional configuration with no cathode marking. Terminals are matte tin-plated leads suitable for J-STD-002 solderability and JESD 22-B102 thermal shock testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity) | Conducts during positive overvoltage events; forms one side of symmetrical clamp path |
| Anode | Transient current exit (negative polarity) | Acts as return path during negative transients - identical terminal serves both directions |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 1500 W peak pulse power | Withstands high-energy ESD and lightning-induced surges per IEC 61000-4-5 (Level 4) |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during fast transients, protecting 3.3 V/5 V logic interfaces |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive-grade reliability validation in safety-critical modules |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for global industrial and consumer shipments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary shunt TVS placed upstream of LDO regulators and DC/DC converters. Use Value: Clamps transients to ≤69.4 V, preventing latch-up or permanent damage to 40 V-rated input stages. | Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital I/O (CAN, LIN) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional clamping element directly at connector interface, before signal conditioning circuitry. Use Value: Symmetric response ensures equal protection for positive/negative transients without polarity-dependent layout constraints. |
| Telecom Line Card Surge Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from induced surges on twisted-pair cabling per IEC 61000-4-5. IC Role / Device Role / Timing Role: Secondary-level TVS used in conjunction with gas discharge tubes (GDTs) for staged protection. Use Value: Fast response (<1 ns) and low dynamic impedance limit let-through energy to safe levels for PHY ICs. | Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to absorb inductive kickback. Use Value: 1500 W rating handles repetitive 100 ms pulses during motor commutation without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC43CA | Lower PPPM (600 W), same VWM and VC; smaller SMA package | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD only |
| SMCJ43CA-E3/9AT | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3) | No difference in protection performance; differs only in material compliance and whisker resistance | Choose E3 for cost-sensitive commercial designs where halogen-free requirement is not mandated |
Compared with SAC43CA and SMCJ43CA-E3/9AT, the SMCJ43CA-M3/9AT uniquely combines 1500 W surge capability, halogen-free construction, and MSL Level 1 reflow compatibility - making it optimal for automotive-tier 1 suppliers and industrial OEMs requiring full compliance traceability.
Availability
SMCJ43CA-M3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom line cards, and consumer appliance motor drives requiring stable component supply and long-term lifecycle assurance.
Supply support for SMCJ43CA-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 part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What does the "CA" suffix indicate in SMCJ43CA-M3/9AT?
The "CA" suffix denotes a bidirectional configuration: the SMCJ43CA-M3/9AT provides symmetrical clamping for both positive and negative voltage transients, unlike unidirectional "A" variants which clamp only in reverse bias. This eliminates polarity dependency during PCB layout and simplifies protection design for AC-coupled or floating nodes - a key feature confirmed in Vishay's datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
Is SMCJ43CA-M3/9AT AEC-Q101 qualified?
The SMCJ43CA-M3/9AT itself is not AEC-Q101 qualified; however, Vishay offers AEC-Q101-qualified versions under ordering codes SMCJ43CAHM3_X (halogen-free) and SMCJ43CAHE3_X (RoHS-only), where "_X" denotes revision letter. The M3 suffix confirms halogen-free and RoHS compliance, but automotive qualification requires explicit HM3 or HE3 suffix with underscored revision code - verified in the "MECHANICAL DATA" and "ORDERING INFORMATION" sections of document 88394.
What is the maximum clamping voltage of SMCJ43CA-M3/9AT and how is it measured?
The maximum clamping voltage (VC) of SMCJ43CA-M3/9AT is 69.4 V, measured at 21.6 A peak pulse current (IPPM) using a standardized 10/1000 µs double-exponential waveform per ANSI/IEEE C62.35. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge conditions - directly extracted from Table "ELECTRICAL CHARACTERISTICS" on page 2 of Vishay document 88394.
Can SMCJ43CA-M3/9AT be used in place of a unidirectional TVS like SMCJ43A-M3/9AT?
No - SMCJ43CA-M3/9AT is bidirectional and lacks polarity marking, while SMCJ43A-M3/9AT is unidirectional with cathode band identification. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC signals or floating grounds, whereas unidirectional types are required for DC rails with defined polarity. The datasheet explicitly states "for unidirectional types the band denotes cathode end, no marking on bidirectional types", confirming functional incompatibility without redesign.
What is the thermal resistance and derating behavior of SMCJ43CA-M3/9AT?
The SMCJ43CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout, and junction-to-lead resistance (RθJL) of 15 °C/W. Derating follows Figure 2 in the datasheet: at 100 °C ambient, rated PPPM drops to ~70 % of 1500 W (≈1050 W); full rating applies only at TA ≤ 25 °C - critical for sustained surge duty cycles in enclosed enclosures or high-temperature environments.
SMCJ43CA-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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 21.6A
- 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)
SMCJ43CA-M3/9AT FAQ
1.How can I place an order for SMCJ43CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43CA-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 SMCJ43CA-M3/9AT reliable?
The price and inventory of SMCJ43CA-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 SMCJ43CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ43CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43CA-M3/9AT?
SMCJ43CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43CA-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 SMCJ43CA-M3/9AT?
For technical support, including SMCJ43CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ43CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ43CA-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 SMCJ43CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ43CA-M3/9AT?
All SMCJ43CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43CA-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 SMCJ43CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ43CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ43CA-M3/9AT Tags
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