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Vishay General Semiconductor - Diodes Division SMCJ43CAHM3/I
- Part No.:
- SMCJ43CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43CAHM3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,138
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Product details
Overview
SMCJ43CAHM3/I 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 a 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 (10/1000 µs waveform), commonly deployed on automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ43CAHM3/I datasheet, SMCJ43CAHM3/I pinout, SMCJ43CAHM3/I application, or SMCJ43CAHM3/I equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamped crowbar during transients, with symmetrical breakdown characteristics in both directions due to its bidirectional construction. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), while the SMC package supports automated placement and meets MSL level 1 per J-STD-020.
The SMCJ43CAHM3/I is rated for -55 °C to +150 °C operating junction temperature and delivers 1500 W surge capability when mounted on 8.0 mm × 8.0 mm copper pads per terminal. Its temperature coefficient of VBR is +0.102 %/°C, enabling predictable voltage drift across automotive thermal profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 47.8 V / 52.8 V at 1.0 mA - Confirmed breakdown range defining turn-on threshold |
| VC @ IPPM | 69.4 V at 21.6 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - Peak surge power handling capacity under standardized waveform |
| IPPM | 21.6 A - Corresponding peak current at VC, used for PCB trace sizing and fuse coordination |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, guiding heatsinking requirements on standard FR-4 |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current in either polarity; connects to protected line without polarity constraint |
| Cathode | Transient current exit (bidirectional) | Completes low-impedance path to ground or reference rail during clamping event |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern vehicle ECUs and industrial control systems |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = ~21.6 V) and reduced energy dissipation in protected ICs |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility up to 260 °C peak without baking |
| Glass passivated junction | Ensures stable leakage current (<1.0 µA) and long-term parameter stability under thermal stress |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD events in engine control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤69.4 V, preventing damage to 5 V or 3.3 V interface ICs while maintaining signal integrity during normal operation. | Use Scenario: Safeguarding PLC analog input channels and digital fieldbus lines against switching surges from solenoids and motor drives. IC Role / Device Role / Timing Role: Parallel-connected TVS on each I/O pin, referenced to system ground or isolated supply return. Use Value: Absorbs 1500 W surges without degradation, enabling >100,000 surge cycles per MIL-STD-883H Method 3015.7. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY magnetics and PoE controller inputs from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level clamping device placed before common-mode chokes and isolation transformers. Use Value: Withstands 10/1000 µs surges up to 21.6 A, reducing secondary-side protection burden and improving system-level surge immunity to IEC 61000-4-5 Level 4. | Use Scenario: Input-stage surge suppression in AC-DC adapters for smart home devices exposed to mains-borne transients. IC Role / Device Role / Timing Role: Secondary-side TVS across DC output rails to protect downstream USB-PD controllers and microcontrollers. Use Value: Halogen-free construction supports UL 62368-1 certification; 43 V VWM aligns with 48 V nominal output designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CAHE3_A/I | Lower PPPM (600 W), SMB package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained consumer boards where full 1500 W is not required | Select when board area is limited and surge threat level is lower (IEC 61000-4-5 Level 2) |
| 1.5KE43CA | Through-hole DO-201 package, same VWM/VC, but slower response and no AEC-Q101 qualification | Used in legacy industrial power supplies where automated SMT is not available | Choose only for prototyping or repair of through-hole assemblies; not for new automotive designs |
Compared with SMBJ43CAHE3_A/I and 1.5KE43CA, the SMCJ43CAHM3/I provides superior surge robustness (1500 W vs. 600 W or 1500 W with inferior thermal performance), AEC-Q101 validation, and halogen-free compliance-making it the preferred choice for production automotive and high-reliability industrial applications.
Availability
SMCJ43CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line surge suppression requiring stable component supply across multi-year production programs.
Supply support for SMCJ43CAHM3/I 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 and application-specific performance.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where AEC-Q101 qualification and consistent clamping behavior are mandatory.
FAQ
What does the 'HM3' suffix indicate in SMCJ43CAHM3/I?
The 'HM3' suffix in SMCJ43CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The 'I' indicates packaging in 13-inch tape-and-reel (3500 units per reel). This distinguishes it from commercial-grade 'M3' variants and non-automotive 'E3' versions, confirming suitability for automotive electronics per ISO/TS 16949 requirements.
Is SMCJ43CAHM3/I unidirectional or bidirectional?
SMCJ43CAHM3/I is a bidirectional TVS diode, as confirmed by the 'CA' suffix and electrical specifications showing symmetrical breakdown (VBR min/max = 47.8 V / 52.8 V) and clamping in both polarities. It has no polarity marking on the SMC package and is intended for AC-coupled or floating signal lines where voltage transients may occur in either direction.
What is the maximum clamping voltage of SMCJ43CAHM3/I and under what test condition?
The maximum clamping voltage of SMCJ43CAHM3/I is 69.4 V, measured at 21.6 A peak pulse current (IPPM) using a 10/1000 µs double-exponential waveform. This value is specified in the Vishay datasheet (Document Number: 88394, Revision: 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Does SMCJ43CAHM3/I require a heatsink for standard operation?
SMCJ43CAHM3/I does not require an external heatsink for transient suppression duty cycles, as its 1500 W rating assumes mounting on 8.0 mm × 8.0 mm copper pads per terminal. Its RθJA of 75 °C/W is sufficient for short-duration surges; however, sustained power dissipation above 6.5 W (PD) requires additional thermal management beyond standard PCB layout.
How does the AEC-Q101 qualification impact the use of SMCJ43CAHM3/I in automotive designs?
The AEC-Q101 qualification of SMCJ43CAHM3/I validates its reliability under automotive stress conditions-including temperature cycling (-55 °C to +150 °C), mechanical shock, and humidity bias-ensuring long-term performance in engine control units, ADAS sensors, and body electronics. This eliminates need for additional qualification testing by Tier 1 suppliers and supports PPAP documentation for production release.
SMCJ43CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ43CAHM3/I FAQ
1.How can I place an order for SMCJ43CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43CAHM3/I 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 SMCJ43CAHM3/I reliable?
The price and inventory of SMCJ43CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ43CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43CAHM3/I?
SMCJ43CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43CAHM3/I 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 SMCJ43CAHM3/I?
For technical support, including SMCJ43CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43CAHM3/I requirements.
6.How does Aetrix verify that SMCJ43CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ43CAHM3/I 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 SMCJ43CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ43CAHM3/I?
All SMCJ43CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43CAHM3/I, 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 SMCJ43CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ43CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ43CAHM3/I Tags
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