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Taiwan Semiconductor Corporation 3KSMC39AH
- Part No.:
- 3KSMC39AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KSMC39AH.pdf
- Description:
- 3000W, 38.6V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,546
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Product details
Overview
3KSMC39AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 36.7V minimum breakdown voltage (VBR), 53.3V maximum clamping voltage (VC) at 176A peak pulse current, and 175°C maximum junction temperature. It is AEC-Q101 qualified and designed for automotive power line surge protection in BLDC motor drives and battery management systems.
For engineers reviewing the 3KSMC39AH datasheet, 3KSMC39AH pinout, 3KSMC39AH application, or 3KSMC39AH equivalent, key selection criteria include unidirectional polarity, 39V working voltage rating (VWM = 33V), IEC 61000-4-2 Level 4/ISO 10605 L4 ESD immunity, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and thermal resistance RθJA = 50°C/W on 16mm × 16mm Cu pad.
Technical Context
This TVS diode operates as a unidirectional clamping device that activates above its breakdown voltage to divert transient energy away from sensitive downstream circuitry. Its 3000W peak pulse power rating (10/1000µs waveform) and low dynamic resistance (RD = 0.261Ω) ensure effective suppression of high-energy transients such as load dump and inductive switching spikes.
Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and supports operation across –55°C to +175°C junction temperature range. The DO-214AB package provides robust thermal performance with RθJL = 17°C/W and RθJC = 10°C/W, enabling stable clamping under sustained surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before leakage exceeds 3 µA |
| VBR (min) | 36.7 V - Minimum breakdown voltage at 1 mA test current, defining turn-on threshold |
| VC (max) | 53.3 V - Maximum clamping voltage at 176 A peak pulse current, limiting protected circuit stress |
| PPPM | 3000 W - Peak pulse power handling capability with 10/1000 µs waveform |
| RD | 0.261 Ω - Dynamic resistance determining voltage rise per unit surge current |
| TJ max | +175 °C - Maximum allowable junction temperature, supporting under-hood automotive placement |
| αT | 10.0 × 10−4/°C - Temperature coefficient used to calculate VBR and VC drift over temperature |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional polarity indicated by cathode band. Weight ≈ 0.210 g. Matte tin-plated leads, solderable per J-STD-002; UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to lower-potential side of protected line; not active during normal TVS clamping |
| Cathode | Current exit during reverse-biased clamping | Connected to higher-potential side (e.g., battery rail); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing |
| IEC 61000-4-2 / ISO 10605 compliance | Withstands ±15 kV contact / ±30 kV air discharge ESD events without degradation |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity | Protects against coupled transients from alternator load dump, inductive switch-off, and supply line noise |
| RoHS & halogen-free | Meets IEC 61249-2-21; suitable for environmentally regulated automotive production |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback and commutation spikes on 12–48V BLDC motor phase lines and power rails. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between motor phase and ground or supply rail to clamp transients below MOSFET VDS rating. Use Value: Limits VC to 53.3 V at 176 A, preventing gate oxide damage and ensuring reliable MOSFET operation under repeated switching stress. | Use Scenario: Guards BMS front-end monitoring ICs and cell balancing circuits against load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main battery input rail upstream of DC-DC converters and analog front ends. Use Value: Withstands 3000 W pulses while maintaining <0.261 Ω dynamic resistance, minimizing voltage overshoot during fast-rising transients. |
| Automotive Lighting Control | Switching Mode Power Supply (SMPS) |
Use Scenario: Protects LED driver ICs and CAN/LIN communication interfaces in headlamp and tail lamp modules exposed to vehicle-level transients. IC Role / Device Role / Timing Role: Secondary-level TVS on 12V supply input and signal lines to absorb ISO 7637-2 Pulse 3b noise and ESD events. Use Value: AEC-Q101 qualification and 175°C TJ max enable direct placement near heat-generating LED drivers without derating. | Use Scenario: Shields AC-DC and DC-DC converter inputs from line surges, lightning-induced transients, and cross-coupled noise in industrial and automotive SMPS. IC Role / Device Role / Timing Role: Input-stage transient suppressor placed after EMI filter but before bridge rectifier or primary-side controller. Use Value: 3000 W peak power rating and 50°C/W RθJA allow sustained clamping without thermal runaway on standard PCB copper pads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39A | Lower PPPM (600 W), same VBR range (36.7–40.5 V), SMB package (smaller thermal mass) | Not rated for ISO 7637-2 Pulse 1/2a/2b; limited to lower-energy transients | Select only for non-automotive or secondary-clamp roles where 3000 W rating is unnecessary |
| SMCJ39A | Same DO-214AB package and 3000 W rating, but not AEC-Q101 qualified; VC = 53.3 V identical | Lacks automotive qualification; unsuitable for OEM or Tier-1 BOMs requiring AEC-Q101 evidence | Acceptable for industrial SMPS where qualification is not mandated, but requires revalidation for automotive reuse |
Compared with SMBJ39A and SMCJ39A, the 3KSMC39AH uniquely combines AEC-Q101 qualification, full ISO 7637-2 Pulse set compliance, and 3000 W clamping in a single automotive-grade part-enabling drop-in use in safety-critical vehicle subsystems without additional system-level validation.
Availability
3KSMC39AH is available at Aetrix Electronics and suitable for BLDC motor drives, battery management systems, and automotive lighting applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for 3KSMC39AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global distribution and automotive qualification capabilities.
The 3KSMCxxAH series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for harsh-environment automotive power line protection where high-energy transient immunity and thermal robustness are mandatory.
FAQ
What is the maximum clamping voltage of the 3KSMC39AH at its rated peak pulse current?
The 3KSMC39AH has a maximum clamping voltage (VC) of 53.3 V at 176 A peak pulse current (10/1000 µs waveform). This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The 3KSMC39AH maintains this clamping performance across its specified operating temperature range, supported by its 10.0 × 10−4/°C temperature coefficient.
Is the 3KSMC39AH suitable for bidirectional transient suppression?
No, the 3KSMC39AH is a unidirectional TVS diode, intended for suppression of transients on DC power lines with defined polarity. Its cathode band marking indicates the terminal that must be connected to the higher-potential side of the protected circuit. For bidirectional AC or floating-line applications, a dedicated bidirectional variant or back-to-back configuration would be required-not provided by the 3KSMC39AH.
Does the 3KSMC39AH meet automotive electromagnetic compatibility standards?
Yes, the 3KSMC39AH meets IEC 61000-4-2 (Level 4), ISO 10605 (Level L4), and ISO 7637-2 (Pulse 1, 2a, 2b, 3a, 3b) requirements. These certifications confirm its suitability for suppressing ESD, conducted emissions, and coupled transients in automotive ECUs, motor controllers, and lighting modules-validated as part of its AEC-Q101 qualification process.
What is the thermal resistance from junction to ambient for the 3KSMC39AH?
The junction-to-ambient thermal resistance (RθJA) of the 3KSMC39AH is 50°C/W when mounted on a 16 mm × 16 mm copper pad per JEDEC test board standard. This value enables accurate thermal modeling of power dissipation during repetitive surge events and informs PCB layout decisions for heatsinking and copper area allocation around the 3KSMC39AH.
Can the 3KSMC39AH replace the SMCJ39A in an existing design?
The 3KSMC39AH shares identical electrical specifications-including VBR, VC, and PPPM-with the SMCJ39A, and uses the same DO-214AB package. However, the 3KSMC39AH adds AEC-Q101 qualification and full ISO 7637-2 compliance. Replacement is electrically feasible, but automotive designs must verify qualification documentation alignment and may require updated PPAP submission due to the enhanced reliability profile of the 3KSMC39AH.
3KSMC39AH 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):
- 33V (Max)
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 56.3A
- 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)
3KSMC39AH FAQ
1.How can I place an order for 3KSMC39AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KSMC39AH 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 3KSMC39AH reliable?
The price and inventory of 3KSMC39AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KSMC39AH is usually 5 days.
3.What payment methods are accepted for 3KSMC39AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KSMC39AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KSMC39AH?
3KSMC39AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KSMC39AH 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 3KSMC39AH?
For technical support, including 3KSMC39AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KSMC39AH requirements.
6.How does Aetrix verify that 3KSMC39AH is sourced from the original manufacturer or authorized distributors?
All 3KSMC39AH 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 3KSMC39AH meets industry standards.
7.What is the process for return or replacement of 3KSMC39AH?
All 3KSMC39AH units undergo pre-shipment inspection (PSI). If there is an issue with 3KSMC39AH, 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 3KSMC39AH part is unused and in its original packaging.
Return procedure for 3KSMC39AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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