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Taiwan Semiconductor Corporation 3KSMC42AH
- Part No.:
- 3KSMC42AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KSMC42AH.pdf
- Description:
- 3000W, 42.1V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,837
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Product details
Overview
3KSMC42AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 42V breakdown voltage (VBR = 40.0–44.2V), 58.1V maximum clamping voltage at 48.4A peak pulse current, and DO-214AB (SMC) package. It delivers automotive-grade surge protection for 12V/24V systems in BLDC motor drives and battery management circuits.
For engineers reviewing the 3KSMC42AH datasheet, 3KSMC42AH pinout, 3KSMC42AH application, or 3KSMC42AH equivalent, key selection criteria include its AEC-Q101 qualification, IEC 61000-4-2 Level 4/ISO 10605 L4 ESD immunity, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 175°C junction rating, and unidirectional polarity with cathode band marking.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector in parallel with sensitive electronics. Its 42V VBR range ensures reliable triggering above normal 36V automotive rail transients while maintaining low leakage (<3µA at 36V). The 58.1V VC at 48.4A defines the maximum voltage imposed on protected circuitry during a 10/1000µs surge.
Thermal design relies on its 17°C/W junction-to-lead resistance and 50°C/W junction-to-ambient rating on a 16mm × 16mm Cu pad. With 10°C/W junction-to-case resistance, it supports high-power pulse handling without thermal runaway under repetitive surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 40.0 / 42.1 / 44.2 V - Ensures consistent turn-on above 36V system rails while tolerancing manufacturing spread |
| VC @ IPPM | 58.1 V - Maximum clamped voltage seen by downstream ICs during 48.4A 10/1000µs surge |
| IPPM | 48.4 A - Peak surge current capability matching ISO 7637-2 Pulse 1 (inductive load dump) requirements |
| RD | 0.331 Ω - Dynamic impedance determining VC rise slope under increasing surge current |
| TJ max | +175°C - Enables operation in under-hood automotive environments with minimal derating |
| Polarity | Unidirectional - Protects against positive-going transients only; requires correct cathode orientation |
| αT | 10.0 × 10−4/°C - Temperature coefficient used to adjust VBR and VC across operating temperature range |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional device with cathode band marking. Weight: 0.210g. Molding compound meets UL 94V-0; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance return plane; carries full surge current during clamping |
| Cathode | Protected circuit connection | Connected to line being protected (e.g., battery rail); voltage referenced to anode during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and chassis applications per stress test requirements |
| IEC 61000-4-2 Level 4 & ISO 10605 L4 | Withstands ±15kV air/±8kV contact ESD events without degradation |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliant | Protects against load dump, supply interruption, and coupled transients in 12V/24V vehicle networks |
| RoHS & halogen-free | Meets EU environmental directives and IEC 61249-2-21 for green PCB assembly |
| Junction temp range | Operates continuously from −55°C to +175°C - suitable for engine bay and power module locations |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback from gate drivers and phase-leg switching in automotive HVAC or EPS motors. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or between gate driver output and ground. Use Value: Limits voltage overshoot to ≤58.1V during 48.4A transients, preventing MOSFET avalanche failure and gate oxide damage. | Use Scenario: Shields cell monitoring ICs and communication interfaces from load-dump surges on 12V auxiliary rails. IC Role / Device Role / Timing Role: Parallel-connected clamping device on BMS power input, triggered within nanoseconds of overvoltage onset. Use Value: Maintains <3µA leakage at 36V nominal rail, minimizing standby current drain while clamping to safe levels during ISO 7637-2 Pulse 1 events. |
| Automotive Lighting Control | Switching Mode Power Supply (SMPS) |
Use Scenario: Guards LED driver ICs and CAN transceivers against transients induced by relay coil de-energization in headlamp modules. IC Role / Device Role / Timing Role: Line-side TVS on 12V input rail upstream of DC-DC converter and microcontroller. Use Value: Provides <1ns response time and 3000W peak power absorption, preserving signal integrity on LIN/CAN lines during lamp switching. | Use Scenario: Protects primary-side controller ICs and secondary-side rectifiers in 12V-input industrial SMPS units. IC Role / Device Role / Timing Role: Input-stage transient suppressor across bulk capacitor terminals. Use Value: Withstands repeated 10/1000µs surges up to 48.4A without parameter shift, ensuring long-term reliability in factory automation power supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | Lower PPPM (600W), higher VC (69.4V), same DO-214AA package | Limited to lower-energy transients; not rated for ISO 7637-2 Pulse 1 | Select when cost sensitivity outweighs automotive surge margin and 3000W capability is unnecessary |
| SMCJ43A | Same 3000W rating and DO-214AB package, but VBR = 45.6–47.8V and VC = 69.4V | Higher clamping voltage reduces protection margin for 42V-rated downstream components | Choose only if system tolerance allows ≥69V clamping; otherwise 3KSMC42AH provides tighter voltage control |
Compared with SMBJ43A and SMCJ43A, the 3KSMC42AH offers optimal balance of 42V VBR, 58.1V VC, and AEC-Q101 qualification - making it the preferred choice for automotive 12V/24V subsystems requiring robust, standards-compliant transient suppression without overdesign.
Availability
3KSMC42AH is available at Aetrix Electronics and suitable for BLDC motor drives, battery management systems, and automotive lighting applications requiring stable component supply and automotive-grade reliability.
Supply support for 3KSMC42AH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power devices, TVS diodes, and automotive-qualified components.
The 3KSMCxxAH series was developed specifically for automotive and industrial power-line surge protection, emphasizing AEC-Q101 compliance, high PPPM density in SMC packaging, and precise VBR/VC control for modern 12V/24V architectures.
FAQ
What is the maximum clamping voltage of the 3KSMC42AH under standard test conditions?
The 3KSMC42AH has a maximum clamping voltage (VC) of 58.1 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPPM) of 48.4 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during surge events. The 3KSMC42AH maintains this clamping performance across its specified junction temperature range due to its 10.0 × 10−4/°C temperature coefficient.
Is the 3KSMC42AH suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the 3KSMC42AH is explicitly AEC-Q101 qualified per the manufacturer's documentation. It meets stringent stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - confirming suitability for automotive powertrain, body electronics, and chassis systems. The 3KSMC42AH also complies with ISO 7637-2 Pulse 1/2a/2b/3a/3b and IEC 61000-4-2 Level 4, reinforcing its automotive readiness.
How does the 3KSMC42AH differ from the 3KSMC47AH in terms of electrical performance?
The 3KSMC42AH features a VBR range of 40.0–44.2 V and VC = 58.1 V at 48.4 A, whereas the 3KSMC47AH has VBR = 44.4–49.0 V and VC = 64.5 V at 43.5 A. The 3KSMC42AH offers lower clamping voltage and higher surge current capability, making it better suited for protecting 36–42V-rated components. Both share identical package, thermal specs, and qualification status, but the 3KSMC42AH provides tighter voltage control for mid-range automotive rails.
What is the polarity configuration and marking convention for the 3KSMC42AH?
The 3KSMC42AH is a unidirectional TVS diode with cathode indicated by a visible band on the DO-214AB (SMC) package body. Its marking code is "3K42A", laser-etched on the device surface. Correct orientation is critical: cathode connects to the line being protected (e.g., battery rail), and anode connects to ground. Reversing polarity prevents clamping action and may cause catastrophic failure under overvoltage.
Does the 3KSMC42AH meet RoHS and halogen-free requirements?
Yes, the 3KSMC42AH is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm. These attributes support environmentally conscious manufacturing and align with global regulatory frameworks for automotive and industrial electronics, including ELV and WEEE directives.
3KSMC42AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36V (Max)
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 48.4A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
3KSMC42AH FAQ
1.How can I place an order for 3KSMC42AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KSMC42AH 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 3KSMC42AH reliable?
The price and inventory of 3KSMC42AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KSMC42AH is usually 5 days.
3.What payment methods are accepted for 3KSMC42AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KSMC42AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KSMC42AH?
3KSMC42AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KSMC42AH 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 3KSMC42AH?
For technical support, including 3KSMC42AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KSMC42AH requirements.
6.How does Aetrix verify that 3KSMC42AH is sourced from the original manufacturer or authorized distributors?
All 3KSMC42AH 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 3KSMC42AH meets industry standards.
7.What is the process for return or replacement of 3KSMC42AH?
All 3KSMC42AH units undergo pre-shipment inspection (PSI). If there is an issue with 3KSMC42AH, 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 3KSMC42AH part is unused and in its original packaging.
Return procedure for 3KSMC42AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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