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Taiwan Semiconductor Corporation 3KSMC21AH
- Part No.:
- 3KSMC21AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KSMC21AH.pdf
- Description:
- 3000W, 21.1V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,037
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Product details
Overview
3KSMC21AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 21.1V typical breakdown voltage (VBR), 29.2V maximum clamping voltage (VC) at 102.7A peak pulse current, and 175°C maximum junction temperature. It is AEC-Q101 qualified and designed for automotive-grade surge protection in BLDC motor drives and battery management systems.
For engineers reviewing the 3KSMC21AH datasheet, 3KSMC21AH pinout, 3KSMC21AH application, or 3KSMC21AH equivalent, key selection criteria include unidirectional polarity, 21V working voltage range, IEC 61000-4-2 Level 4/ISO 10605 L4 ESD immunity, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and thermal resistance of 17°C/W (junction-to-lead).
Technical Context
This TVS diode operates as a unidirectional clamping device, triggered when reverse voltage exceeds its 20–22.2V breakdown range (VBR min/typ/max). Its 29.2V clamping voltage at 102.7A (10/1000µs) ensures robust overvoltage suppression during fast transients.
Thermal performance is defined by RθJL = 17°C/W and RθJA = 50°C/W on a 16mm × 16mm Cu pad PCB, supporting sustained operation up to 175°C junction temperature. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before leakage exceeds 3 µA |
| VBR (min/typ/max) | 20 / 21.1 / 22.2 V - Breakdown voltage range at 1 mA test current; defines turn-on threshold |
| VC @ IPPM | 29.2 V - Clamping voltage at 102.7 A peak pulse (10/1000 µs); limits downstream voltage stress |
| PPPM | 3000 W - Peak pulse power handling capability under standardized surge waveform |
| RθJL | 17 °C/W - Junction-to-lead thermal resistance; critical for PCB-level thermal design and power derating |
| TJ max | 175 °C - Maximum allowable junction temperature; enables high-ambient automotive deployment |
| αT | 9.2 × 10−4/°C - Temperature coefficient of VBR; used to calculate voltage shift across operating temperature range |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., battery rail or signal input); clamps to VC when overvoltage occurs |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use, including temperature cycling, mechanical shock, and humidity testing |
| IEC 61000-4-2 Level 4 & ISO 10605 L4 compliance | Withstands ±15 kV air discharge and ±8 kV contact discharge without degradation |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity | Protects against load dump, inductive switching, and supply line transients in 12 V vehicle systems |
| UL 94V-0 molding compound | Self-extinguishing encapsulation material prevents flame propagation in high-energy fault conditions |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback and commutation spikes in 12 V automotive BLDC motor control circuits. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor phase inputs to clamp transients below MOSFET drain-source breakdown. Use Value: Limits VC to 29.2 V at 102.7 A, preventing gate oxide damage and ensuring reliable MOSFET operation under ISO 7637-2 Pulse 2b. | Use Scenario: Protects cell monitoring ICs and communication lines from load-dump surges on 12 V auxiliary battery rails. IC Role / Device Role / Timing Role: Primary overvoltage clamp on BMS main power input, upstream of DC-DC converters and analog front-ends. Use Value: Delivers 3000 W peak pulse power handling with 175°C TJ rating, enabling uninterrupted operation in under-hood environments. |
| Automotive Lighting Control | Switching Mode Power Supply (SMPS) |
Use Scenario: Shields LED driver ICs and CAN/LIN transceivers from transients induced by relay switching and alternator ripple. IC Role / Device Role / Timing Role: Input-side TVS on lighting module power entry, coordinated with ceramic X/Y capacitors for broadband filtering. Use Value: 9.2 × 10−4/°C αT enables stable clamping across −40°C to +125°C ambient, meeting OEM thermal drift requirements. | Use Scenario: Safeguards primary-side controller ICs and rectifier diodes in 12 V input SMPS used in infotainment and ADAS ECUs. IC Role / Device Role / Timing Role: Parallel-connected unidirectional suppressor across bulk capacitor input to absorb line surges per IEC 61000-4-5. Use Value: 17°C/W RθJL allows direct thermal coupling to copper pour, reducing thermal impedance and sustaining 8.5 W steady-state dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A (Bourns) | Lower PPPM (600 W), higher VC (32.4 V at 18.5 A), DO-214AA (SMB) package | Not rated for ISO 7637-2 Pulse 1/2a/2b/3a/3b; limited to consumer-grade surge levels | Choose only for cost-sensitive non-automotive designs where 3000 W clamping is unnecessary |
| TPSMA6L22A (Texas Instruments) | Same DO-214AB package, but lower PPPM (600 W), higher VC (33.2 V at 18.1 A), no AEC-Q101 qualification | Lacks automotive qualification and ISO 7637-2 compliance; intended for industrial/commercial use only | Select only if AEC-Q101 and full automotive transient immunity are not required |
Compared with SMBJ20A and TPSMA6L22A, the 3KSMC21AH delivers triple the peak pulse power (3000 W vs. 600 W), tighter clamping (29.2 V vs. ≥32.4 V), and full automotive qualification-making it the sole option for ISO 7637-2-compliant 12 V system protection.
Availability
3KSMC21AH is available at Aetrix Electronics and suitable for automotive BLDC motor drives, battery management systems, and lighting control modules requiring stable component supply and long-term lifecycle support.
Supply support for 3KSMC21AH 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 AEC-Q101 process validation.
The 3KSMCxxAH series was developed specifically for automotive-grade transient suppression in 12 V systems, targeting ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance and under-hood thermal reliability.
FAQ
What is the breakdown voltage tolerance of the 3KSMC21AH?
The 3KSMC21AH has a specified VBR range of 20.0 V (min) to 22.2 V (max) at 1 mA test current, with 21.1 V typical. This ±5.2% tolerance ensures consistent turn-on behavior across production lots while accommodating thermal drift via its 9.2 × 10−4/°C temperature coefficient. The 3KSMC21AH maintains this specification under AEC-Q101 stress conditions.
Is the 3KSMC21AH suitable for bidirectional transient protection?
No, the 3KSMC21AH is a unidirectional TVS diode, indicated by its single cathode band and specified electrical parameters (e.g., VWM = 18 V, VBR only defined in reverse direction). For bidirectional protection, a symmetric device such as the 3KSMC21A (dual-diode configuration) would be required. The 3KSMC21AH must be oriented with cathode toward the protected line.
What is the maximum steady-state power dissipation for the 3KSMC21AH?
The 3KSMC21AH has a steady-state power dissipation (PD) rating of 8.5 W at lead temperature (TL) = 25°C, measured on a 16 mm × 16 mm copper pad PCB. Derating is required above 25°C per Figure 2 in the datasheet, reaching zero dissipation at ~120°C lead temperature. This value applies only to continuous DC or low-frequency operation-not transient events.
Does the 3KSMC21AH meet RoHS and halogen-free requirements?
Yes, the 3KSMC21AH is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated per J-STD-002 solderability standards. Moisture sensitivity level is rated at Level 1 (per J-STD-020), eliminating bake requirements prior to reflow.
How does the 3KSMC21AH perform under ISO 7637-2 Pulse 3b conditions?
The 3KSMC21AH is explicitly validated for ISO 7637-2 Pulse 3b (capacitive coupled burst, 100 ns rise time, 300 ns duration), with clamping performance maintained at ≤29.2 V under full 102.7 A surge. Its low dynamic resistance (RD = 0.079 Ω) and fast response (<1 ps) ensure effective suppression of sub-microsecond transients common in automotive wiring harnesses.
3KSMC21AH 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):
- 18V (Max)
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 102.7A
- 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)
3KSMC21AH FAQ
1.How can I place an order for 3KSMC21AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KSMC21AH 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 3KSMC21AH reliable?
The price and inventory of 3KSMC21AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KSMC21AH is usually 5 days.
3.What payment methods are accepted for 3KSMC21AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KSMC21AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KSMC21AH?
3KSMC21AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KSMC21AH 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 3KSMC21AH?
For technical support, including 3KSMC21AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KSMC21AH requirements.
6.How does Aetrix verify that 3KSMC21AH is sourced from the original manufacturer or authorized distributors?
All 3KSMC21AH 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 3KSMC21AH meets industry standards.
7.What is the process for return or replacement of 3KSMC21AH?
All 3KSMC21AH units undergo pre-shipment inspection (PSI). If there is an issue with 3KSMC21AH, 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 3KSMC21AH part is unused and in its original packaging.
Return procedure for 3KSMC21AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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