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Vishay General Semiconductor - Diodes Division SMC3K43CAHM3_A/H
- Part No.:
- SMC3K43CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K43CAHM3_A/H.pdf
- Description:
- 3KW, 43V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,036
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Product details
Overview
SMC3K43CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for automotive-grade circuit protection. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), 69.4 V clamping voltage at 43.2 A (10/1000 μs), 3000 W peak pulse power, and AEC-Q101 qualification - deployed to safeguard MOSFETs and sensor signal lines against ISO 7637-2 Pulse 1/2a/3a/3b transients in 12 V battery systems.
For engineers reviewing the SMC3K43CAHM3_A datasheet, SMC3K43CAHM3_A pinout, SMC3K43CAHM3_A application, or SMC3K43CAHM3_A equivalent, key selection criteria include clamping performance under 10/1000 μs and 8/20 μs waveforms, junction temperature derating above 25 °C, compliance with IEC 61000-4-2 (±30 kV ESD), and compatibility with automated SMT assembly per J-STD-002.
Technical Context
This TVS diode operates bidirectionally with no polarity marking and delivers low incremental surge resistance for rapid voltage clamping during fast-rising transients such as load dump (ISO 16750-2 Pulse b) and inductive switching spikes. Its thermal design supports continuous operation up to TJ = 175 °C, with RthJA = 90 °C/W and RthJM = 4.0 °C/W on standard FR4 PCB footprints.
The device meets stringent automotive reliability requirements: AEC-Q101 qualified, UL 497B recognized (E136766), MSL Level 1 (260 °C reflow), halogen-free, RoHS-compliant, and JESD201 Class 2 whisker resistant. Its 150 pF typical junction capacitance at zero bias ensures minimal signal distortion on data lines up to ~10 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 36–48 V nominal systems. |
| VBR (min/max) | 47.8 V / 52.8 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold across production lot. |
| VC @ IPPM (10/1000 μs) | 69.4 V at 43.2 A - Clamping voltage limits downstream IC stress during common automotive transient events like ISO 7637-2 Pulse 1. |
| PPPM | 3000 W - Peak pulse power handling capability with 10/1000 μs waveform; enables robust protection against repetitive surges without thermal runaway. |
| TJ max. | 175 °C - Maximum junction temperature rating; allows deployment in under-hood automotive environments with high ambient thermal loads. |
| ESD Rating | ±30 kV (IEC 61000-4-2 contact/air) - Provides immunity to human-body-model electrostatic discharge, eliminating need for external ESD diodes on exposed ports. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with standard pick-and-place and reflow processes. |
Pinout & Package
SMC3K43CAHM3_A uses the SMC (DO-214AB) package - a two-terminal, bidirectional surface-mount device with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD22-B102, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals function identically due to bidirectional construction; connects across protected line and ground (or between differential lines) without orientation dependency. |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed copper slug provides primary thermal path to PCB; requires adequate copper pour for RthJM = 4.0 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, LIN, sensor bridges) without polarity concerns. |
| 30 kW surge rating (8/20 μs) | Withstands high-energy lightning-induced surges per IEC 61000-4-5, supporting telecom and industrial power supply input stages. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics requiring long-term reliability under thermal cycling. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected ICs - e.g., clamps 43 V line to ≤69.4 V during 43.2 A transient, preserving MOSFET gate oxide integrity. |
| Halogen-free & RoHS-compliant | Meets global environmental regulations and supports lead-free reflow profiles up to 260 °C peak, aligning with modern manufacturing standards. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V power rails feeding ECUs and lighting modules from load dump pulses (ISO 16750-2 Pulse b) and alternator transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and LDOs to prevent catastrophic failure during battery disconnection events. Use Value: Limits rail voltage to ≤69.4 V during 43.2 A transients, enabling use of 75 V-rated input capacitors and reducing system-level BOM cost vs. higher-voltage alternatives. |
Use Scenario: Shielding analog output lines of pressure, temperature, and position sensors in factory automation equipment from EFT and surge coupling. IC Role / Device Role / Timing Role: Fast-response shunt protector on 4–20 mA or 0–10 V signal paths, placed adjacent to connector entry points. Use Value: Sub-1 ns response time and 150 pF capacitance preserve signal fidelity up to 10 MHz while suppressing ±4 kV EFT bursts per IEC 61000-4-4. |
| Automotive CAN Bus Protection | Consumer Power Adapter Input Stage |
Use Scenario: Bidirectional protection of CAN_H/CAN_L differential pair in vehicle infotainment and gateway modules subjected to ISO 7637-2 Pulse 3a/3b. IC Role / Device Role / Timing Role: Common-mode TVS across CAN bus lines to ground, leveraging symmetrical clamping to maintain differential integrity during fast transients. Use Value: Clamps both lines simultaneously to ≤69.4 V, preventing receiver saturation and bit errors while maintaining <100 ps skew between channels. |
Use Scenario: Secondary surge suppression on AC-DC adapter primary-side inputs after MOVs, targeting residual 8/20 μs surges per IEC 61000-4-5 Level 3. IC Role / Device Role / Timing Role: Precision clamping element in series with fuse and NTC thermistor, activated only when MOV clamping voltage exceeds 69.4 V. Use Value: Adds 30 kW surge headroom beyond MOV capability, extending adapter lifetime in regions with unstable grid conditions and frequent lightning strikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA | Lower PPPM (600 W), same VWM/VBR range, SMB package (smaller footprint, higher RthJA = 110 °C/W) | Not AEC-Q101 qualified; suitable for consumer/commercial grade only | Select when space-constrained layouts prioritize size over automotive reliability and thermal performance. |
| 1.5KE43CA | Higher PPPM (1500 W), axial-leaded DO-201 package, no MSL or AEC-Q101 rating | Limited to through-hole prototyping or legacy designs; incompatible with automated SMT assembly | Choose only for manual assembly or cost-sensitive non-automotive applications where reflow compatibility is not required. |
Compared with SMBJ43CA and 1.5KE43CA, SMC3K43CAHM3_A delivers triple the peak pulse power in an automotive-qualified SMT package with superior thermal dissipation - making it the preferred choice for production-grade 12 V automotive electronics where reliability, surge margin, and manufacturability are jointly critical.
Availability
SMC3K43CAHM3_A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, CAN bus transient suppression, and consumer power adapter surge resilience requiring stable component supply across multi-year production cycles.
Supply support for SMC3K43CAHM3_A 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 high-reliability diodes, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SMC3KxxCAHM3_A series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing low clamping voltage, high surge robustness, and seamless integration into automated SMT production lines.
FAQ
What is the maximum clamping voltage of SMC3K43CAHM3_A under a 10/1000 μs transient?
The SMC3K43CAHM3_A clamps to a maximum of 69.4 V when subjected to its rated peak pulse current of 43.2 A with a 10/1000 μs waveform. This value is specified in the Electrical Characteristics table at TA = 25 °C and represents the upper limit of voltage seen by downstream components during standardized automotive transients such as ISO 7637-2 Pulse 1.
Is SMC3K43CAHM3_A suitable for protecting CAN FD interfaces?
Yes, SMC3K43CAHM3_A is suitable for CAN FD interface protection due to its bidirectional structure, low 150 pF junction capacitance at zero bias, and sub-nanosecond response time. Its 69.4 V clamping voltage preserves signal integrity on 12 V biased CAN buses, and AEC-Q101 qualification ensures reliability in automotive CAN FD gateways and ECU nodes.
Does SMC3K43CAHM3_A require a heatsink for operation at 175 °C junction temperature?
No external heatsink is required for SMC3K43CAHM3_A. Its RthJM of 4.0 °C/W enables direct thermal transfer from the die to the PCB copper pad. Maintaining ≥1 cm² of 2 oz. copper pour beneath the SMC package achieves the specified 175 °C maximum junction temperature under full 3000 W pulse loading, per JEDEC 51-14 testing methodology.
How does the SMC3K43CAHM3_A compare to standard 1N5388B Zener diodes in surge protection?
Unlike the 1N5388B - a unidirectional Zener rated for 43 V and 5 W continuous dissipation - the SMC3K43CAHM3_A is a bidirectional TVS optimized for transient suppression: it handles 3000 W peak pulses, responds in <1 ns, and clamps at 69.4 V versus 1N5388B's undefined surge behavior. The SMC3K43CAHM3_A replaces multiple discrete components in surge-prone applications where Zeners would fail catastrophically.
Can SMC3K43CAHM3_A be used in parallel to increase surge current handling?
Parallel operation of SMC3K43CAHM3_A devices is not recommended due to parameter variation (VBR tolerance ±5 %) causing current imbalance. For higher surge ratings, Vishay specifies the SMC3K43CAHM3_A itself delivers 30 kW at 8/20 μs - sufficient for most automotive and industrial surge standards. If higher capacity is needed, consult Vishay's application note AN934 for matched-array solutions.
SMC3K43CAHM3_A/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:
- 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):
- 43.2A
- Power - Peak Pulse:
- 3000W (3kW)
- 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)
SMC3K43CAHM3_A/H FAQ
1.How can I place an order for SMC3K43CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K43CAHM3_A/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 SMC3K43CAHM3_A/H reliable?
The price and inventory of SMC3K43CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K43CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K43CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K43CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K43CAHM3_A/H?
SMC3K43CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K43CAHM3_A/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 SMC3K43CAHM3_A/H?
For technical support, including SMC3K43CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K43CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K43CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K43CAHM3_A/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 SMC3K43CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K43CAHM3_A/H?
All SMC3K43CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K43CAHM3_A/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 SMC3K43CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K43CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K43CAHM3_A/H Tags
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