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Vishay General Semiconductor - Diodes Division SMC3K43CAHM3/9A
- Part No.:
- SMC3K43CAHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K43CAHM3/9A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,238
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Product details
Overview
SMC3K43CAHM3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for high-energy surge protection. It features a 43 V standoff voltage (VWM), 47.8–52.8 V breakdown range (VBR), 3000 W peak pulse power (10/1000 μs), 43.2 A peak pulse current (IPPM), and clamps to ≤69.4 V at rated surge. It is AEC-Q101 qualified and used to protect automotive sensor signal lines against inductive switching transients.
For engineers reviewing the SMC3K43CAHM3/9A datasheet, SMC3K43CAHM3/9A pinout, SMC3K43CAHM3/9A application, or SMC3K43CAHM3/9A equivalent, key selection criteria include bidirectional clamping capability, 3000 W surge rating, AEC-Q101 qualification, SMC package thermal performance, and compatibility with automated reflow per J-STD-020 MSL Level 1.
Technical Context
The SMC3K43CAHM3/9A operates as a silicon avalanche diode-based TVS, leveraging controlled reverse-biased breakdown to clamp transient overvoltages. Its bidirectional structure enables symmetrical protection on AC or floating signal paths without polarity constraints.
It delivers 3000 W peak pulse power under standardized 10/1000 μs waveform conditions, with low incremental surge resistance ensuring stable clamping voltage up to IPPM. The device sustains operation from −55 °C to +150 °C junction temperature and meets UL 497B safety recognition (E136766).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin. |
| VBR (min/max) | 47.8 V / 52.8 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | ≤69.4 V - Clamped voltage during 43.2 A surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 3000 W - Peak pulse power handling (10/1000 μs); supports robust protection against automotive load-dump or ISO 7637-2 pulses. |
| IPPM | 43.2 A - Peak surge current capability; directly correlates with energy absorption (E ≈ 0.5 × VC × IPPM × tp). |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with minimal derating. |
| Polarity | Bidirectional - Provides symmetrical clamping on both polarities; eliminates need for orientation-aware placement. |
| Qualification | AEC-Q101 - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Molding compound meets UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Anode/Cathode terminal pair | Bidirectional device - no functional anode/cathode distinction; terminals are electrically symmetric for AC protection. |
| Anode (unmarked end) | Anode/Cathode terminal pair | Same as cathode terminal; polarity marking is absent on bidirectional variants per datasheet note. |
Key Features
| Feature | Design Value |
|---|---|
| 3000 W peak pulse power | Enables protection against severe transients like ISO 7637-2 Pulse 5a (load dump) without cascaded staging. |
| AEC-Q101 qualification | Validates long-term reliability in automotive ECUs, body control modules, and ADAS sensor interfaces. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without moisture sensitivity concerns or baking requirements. |
| UL 497B recognition (E136766) | Meets safety standards for telecom and industrial equipment requiring certified surge protection components. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving clamping fidelity. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor signal lines (e.g., temperature, pressure) in engine control units from inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional voltage clamping element placed across differential or single-ended signal traces. Use Value: Limits transient-induced voltage to ≤69.4 V, preventing latch-up or gate oxide damage in downstream MCU or amplifier inputs. |
Use Scenario: Safeguarding digital input/output channels of programmable logic controllers exposed to relay coil back-EMF and motor drive noise. IC Role / Device Role / Timing Role: Primary surge suppression component mounted at connector interface or terminal block entry point. Use Value: Absorbs 3000 W surges without degradation, maintaining signal integrity and reducing false triggering in 24 V DC control systems. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY or RS-485 transceivers from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage transient suppressor in multi-stage protection architecture, upstream of GDT or MOV. Use Value: Fast response (<1 ns) and low clamping voltage ensure transceiver ICs remain within absolute maximum ratings during Category 3/4 surge events. |
Use Scenario: Protecting AC-DC adapter primary-side rectifier and controller ICs from mains-borne surges and switching transients. IC Role / Device Role / Timing Role: Secondary-level TVS placed across bulk capacitor or bridge rectifier output. Use Value: Withstands repeated 3000 W pulses while maintaining VWM = 43 V margin above nominal 36–40 V DC bus, avoiding leakage-induced inefficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K43CAHM3_A/9A | Identical electrical specs and AEC-Q101 qualification; differs only in suffix notation (underscore vs. no underscore in "HM3_A" vs "HM3"). | No functional difference; same SMC package, marking, and production lot traceability. | Select SMC3K43CAHM3_A/9A when sourcing from distributors listing the underscored variant; fully interchangeable. |
| SMC3K45CAHM3/9A | Higher VWM (45 V) and VBR (50.0–55.3 V); lower IPPM (41.3 A) and clamping voltage (72.7 V). | Better suited for 48 V nominal systems where 43 V margin is insufficient; trades surge current for higher standoff. | Choose SMC3K45CAHM3/9A if system operating voltage exceeds 43 V but requires same package and qualification level. |
Compared with SMC3K43CAHM3/9A, the underscored SMC3K43CAHM3_A/9A offers identical protection performance and qualification, while SMC3K45CAHM3/9A provides higher standoff at the cost of reduced surge current capacity-enabling precise voltage-margin tuning in 48 V automotive or industrial designs.
Availability
SMC3K43CAHM3/9A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line interface circuits requiring stable component supply, AEC-Q101 compliance, and high-energy transient suppression.
Supply support for SMC3K43CAHM3/9A 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific validation.
The SMC3KxxCAHM3 series was developed for automotive and industrial applications demanding high-power, AEC-Q101-qualified transient suppression in compact SMC packages-targeting ECU, ADAS, and harsh-environment control systems.
FAQ
What does the "HM3" suffix indicate in SMC3K43CAHM3/9A?
The "HM3" suffix in SMC3K43CAHM3/9A denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this grade from commercial "M3" variants and confirms compliance with automotive reliability standards including temperature cycling, HTRB, and ESD testing per JESD22.
Is SMC3K43CAHM3/9A suitable for 48 V automotive systems?
SMC3K43CAHM3/9A has a 43 V standoff voltage (VWM), making it appropriate for 36 V nominal systems but marginal for sustained 48 V operation. For 48 V applications, SMC3K45CAHM3/9A (VWM = 45 V) or SMC3K48CAHM3/9A (VWM = 48 V) are recommended alternatives with validated margin and identical AEC-Q101 qualification.
Does SMC3K43CAHM3/9A require special PCB layout considerations?
Yes - SMC3K43CAHM3/9A benefits from short, low-inductance traces to the protected node and ground. Per Vishay's recommendations, use minimum 0.185″ (4.69 mm) copper pad area per terminal and avoid bottom-side wave soldering. Thermal relief should be minimized to maintain surge current path integrity during transient events.
What is the meaning of "Not for New Designs" in the SMC3K43CAHM3/9A datasheet?
"Not for New Designs" applies to the legacy SMC3K22CA–SMC3K78CA family, indicating Vishay recommends newer HM3_A-suffixed variants (e.g., SMC3K43CAHM3_A/9A) for new projects. However, SMC3K43CAHM3/9A remains fully manufactured, stocked, and supported with identical specs and qualification-no obsolescence risk for existing designs.
How does SMC3K43CAHM3/9A compare to SMAJ43A in surge handling?
SMC3K43CAHM3/9A delivers 3000 W peak pulse power (10/1000 μs), whereas SMAJ43A is rated at 400 W. The SMC package's larger thermal mass and optimized die design enable ~7.5× higher energy absorption. Both are bidirectional, but SMC3K43CAHM3/9A is AEC-Q101 qualified while SMAJ43A is commercial-grade.
SMC3K43CAHM3/9A 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K43CAHM3/9A FAQ
1.How can I place an order for SMC3K43CAHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K43CAHM3/9A 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 SMC3K43CAHM3/9A reliable?
The price and inventory of SMC3K43CAHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K43CAHM3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K43CAHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K43CAHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K43CAHM3/9A?
SMC3K43CAHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K43CAHM3/9A 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 SMC3K43CAHM3/9A?
For technical support, including SMC3K43CAHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K43CAHM3/9A requirements.
6.How does Aetrix verify that SMC3K43CAHM3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K43CAHM3/9A 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 SMC3K43CAHM3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K43CAHM3/9A?
All SMC3K43CAHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K43CAHM3/9A, 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 SMC3K43CAHM3/9A part is unused and in its original packaging.
Return procedure for SMC3K43CAHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K43CAHM3/9A Tags
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