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Vishay General Semiconductor - Diodes Division SMCJ43CAHM3/H
- Part No.:
- SMCJ43CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43CAHM3/H.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,716
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Product details
Overview
SMCJ43CAHM3/H 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 (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMCJ43CAHM3/H datasheet, SMCJ43CAHM3/H pinout, SMCJ43CAHM3/H application, or SMCJ43CAHM3/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance (HM3 suffix), and real-world protection use cases - all validated against Vishay Document #88394 (Rev. 09-Jan-2024).
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with breakdown voltage (VBR) ranging from 47.8 V to 52.8 V at 1 mA test current, and exhibits low incremental surge resistance for effective clamping during fast transients. Its glass-passivated junction ensures stable performance under repetitive surge stress and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
The device is rated for -55 °C to +150 °C operating junction temperature, supports 1.0 µA max reverse leakage at VWM, and delivers sub-nanosecond response time - critical for protecting MOSFET gates, CAN bus receivers, and microcontroller I/O pins against ESD and load-switching spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 36–48 V nominal systems. |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - guaranteed breakdown window ensures predictable turn-on across production lots and temperature range. |
| VC @ IPPM | 69.4 V at 21.6 A (10/1000 µs) - clamping voltage limits downstream component stress during worst-case surge events. |
| PPPM | 1500 W - peak pulse power handling capacity determines survivability against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| RθJA | 75 °C/W - thermal resistance from junction to ambient enables derating calculations for PCB pad layout and power dissipation limits. |
| TJ max | +150 °C - maximum junction temperature supports operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMC (DO-214AB) - surface-mount outline with 8.0 mm × 8.0 mm copper pads per terminal for optimal thermal and surge current path. |
Pinout & Package
SMCJ43CAHM3/H uses the standard SMC (DO-214AB) package: molded plastic body with two coplanar matte tin-plated leads, no polarity marking (bidirectional configuration). Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay's recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (positive half-cycle) | Conducts transient energy into the device during positive voltage excursions relative to cathode reference. |
| Cathode | Surge current entry (negative half-cycle) | Conducts transient energy during negative excursions - functionally identical to anode due to bidirectional symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, Ethernet PHY) without polarity concerns. |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules, ADAS sensors, and infotainment power supplies per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for Tier-1 automotive suppliers and industrial OEMs requiring material declaration (Vishay Doc. #99912). |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes let-through voltage during surge events - critical for safeguarding 3.3 V/5 V logic interfaces downstream of protection stage. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without moisture-induced failure, eliminating bake requirements pre-assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply inputs in body control modules against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and LDOs to limit input voltage excursion. Use Value: Withstands 1500 W surges while clamping below 70 V - preventing damage to 75 V-rated input capacitors and regulator ICs. |
Use Scenario: Shielding analog output lines (4–20 mA, 0–10 V) of pressure/temperature transmitters from field wiring induced transients. IC Role / Device Role / Timing Role: Bidirectional shunt protector located at connector interface to divert surge energy before reaching precision ADC front-end. Use Value: Symmetric clamping ensures equal protection for positive/negative transients common in long cable runs exposed to lightning coupling. |
| Automotive CAN Bus Transceiver Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TCAN1042, TJA1057) against ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4). IC Role / Device Role / Timing Role: Secondary-level TVS placed directly at transceiver pins to absorb fast-rising transients not filtered by bulk ferrites. Use Value: Sub-nanosecond response and 69.4 V clamping prevent latch-up or permanent damage to transceiver silicon during ±8 kV contact discharge. |
Use Scenario: Input-stage surge suppression in universal AC/DC adapters for smart home hubs and IoT gateways subjected to mains-borne surges. IC Role / Device Role / Timing Role: First-line defense after bridge rectifier, clamping line-to-line and line-to-ground transients per IEC 61000-4-5 Level 3. Use Value: 1500 W PPPM rating allows single-device compliance with EN 61000-4-5 without cascaded protection stages, reducing BOM count. |
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 | Same VWM (43 V) and VC (69.4 V), but lower PPPM (600 W); smaller SMA package (DO-214AC). | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 or IEC 61000-4-5. | Select when board space is constrained and surge threat level is limited to human-body-model ESD. |
| SMCJ43CAHE3/H | Identical electrical specs and SMC package, but RoHS-compliant commercial grade (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Approved for industrial/commercial use only; excluded from automotive production programs requiring AEC-Q101 documentation. | Choose for cost-sensitive non-automotive designs where halogen-free requirement does not apply. |
Compared with SAC43CA and SMCJ43CAHE3/H, the SMCJ43CAHM3/H uniquely combines 1500 W surge capability, AEC-Q101 qualification, and halogen-free compliance - making it the sole option for automotive-grade, high-energy protection in space-constrained SMC layouts.
Availability
SMCJ43CAHM3/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and consumer power adapter certification requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCJ43CAHM3/H 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, automotive qualification, and application-specific performance.
The SMCJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising signal integrity or thermal stability.
FAQ
What is the clamping voltage of SMCJ43CAHM3/H at its rated peak pulse current?
The SMCJ43CAHM3/H has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 21.6 A using the standardized 10/1000 µs waveform. This value is measured under conditions specified in Vishay Document #88394 and reflects the upper limit of voltage seen by downstream circuitry during a worst-case surge event. The SMCJ43CAHM3/H maintains this clamping performance across its operational temperature range and is validated for AEC-Q101 compliance.
Is SMCJ43CAHM3/H suitable for automotive applications?
Yes, the SMCJ43CAHM3/H is explicitly qualified to AEC-Q101 standards, as confirmed by Vishay's ordering code suffix "HM3_X" and documentation in Revision 09-Jan-2024 of Document #88394. It is approved for use in automotive powertrain, chassis, and body electronics where transient immunity to ISO 7637-2 and IEC 61000-4-5 is required. The SMCJ43CAHM3/H also meets MSL Level 1 and operates reliably from -55 °C to +150 °C junction temperature.
How does the HM3 suffix differ from E3 or HE3 in SMCJ43CAHM3/H?
The HM3 suffix in SMCJ43CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from E3 (RoHS-compliant commercial grade, no AEC-Q101) and HE3 (RoHS-compliant + AEC-Q101, but not halogen-free). All three share identical electrical characteristics and SMC package, but only SMCJ43CAHM3/H satisfies strict automotive material declarations requiring halogen-free content per Vishay Doc. #99912.
What is the thermal resistance of SMCJ43CAHM3/H, and how does it affect PCB layout?
The SMCJ43CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on Vishay's recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value directly impacts sustained power dissipation capability: at 6.5 W rated power, junction temperature rise above ambient is ~488 °C without derating - hence proper copper area and airflow are essential. The SMCJ43CAHM3/H thermal performance assumes minimum pad layout per Figure 5 in Document #88394.
Does SMCJ43CAHM3/H have polarity markings, and how is it connected in circuit?
No, the SMCJ43CAHM3/H has no polarity markings because it is a bidirectional TVS diode - functionally symmetric with identical clamping behavior in both directions. It is installed across protected nodes (e.g., between signal line and ground, or between differential pair lines) without regard to orientation. Unlike unidirectional variants (e.g., SMCJ43A), the SMCJ43CAHM3/H does not feature a cathode band and relies on its intrinsic bidirectional structure for AC or floating rail protection.
SMCJ43CAHM3/H 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/H FAQ
1.How can I place an order for SMCJ43CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43CAHM3/H 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/H reliable?
The price and inventory of SMCJ43CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ43CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43CAHM3/H?
SMCJ43CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43CAHM3/H 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/H?
For technical support, including SMCJ43CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43CAHM3/H requirements.
6.How does Aetrix verify that SMCJ43CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ43CAHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMCJ43CAHM3/H?
All SMCJ43CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43CAHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMCJ43CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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