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Taiwan Semiconductor Corporation 3KSMC12AH
- Part No.:
- 3KSMC12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KSMC12AH.pdf
- Description:
- 3000W, 12V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,238
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Product details
Overview
3KSMC12AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 12V breakdown voltage (VBR = 11.4–12.6 V), 17.0 V maximum clamping voltage at 176 A peak pulse current, and 175°C maximum junction temperature. It is AEC-Q101 qualified and designed for automotive-grade surge protection in battery management systems and BLDC motor drives.
For engineers reviewing the 3KSMC12AH datasheet, 3KSMC12AH pinout, 3KSMC12AH application, or 3KSMC12AH equivalent, key selection criteria include unidirectional polarity, 10 V working voltage (VWM), 17.0 V clamping performance at 176 A, IEC 61000-4-2 Level 4/ISO 10605 L4 compliance, and DO-214AB thermal resistance (RθJL = 17°C/W).
Technical Context
The 3KSMC12AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 12 V nominal breakdown range (11.4–12.6 V at 1 mA). Its 17.0 V clamping voltage at 176 A (10/1000 µs) ensures low-voltage overshoot suppression during fast transients.
Thermally, it delivers RθJL = 17°C/W and RθJA = 50°C/W on a 16 mm × 16 mm Cu pad PCB, enabling reliable 8.5 W steady-state dissipation. It meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and switching-spike immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 11.4 / 12.0 / 12.6 V - Ensures consistent avalanche turn-on across production units at 1 mA test current |
| VC @ IPPM | 17.0 V at 176 A - Limits downstream voltage to safe levels during 3000 W transient events |
| VWM | 10 V - Maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| PPPM | 3000 W - Peak pulse power handling per 10/1000 µs waveform, defining surge robustness |
| TJ max | +175°C - Enables operation in under-hood automotive environments without derating |
| RθJL | 17°C/W - Supports efficient heat transfer to PCB copper, critical for sustained surge duty cycles |
| Polarity | Unidirectional - Protects only against reverse-polarity surges; cathode band indicates terminal orientation |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band, weight ≈ 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to system ground or lower-potential rail; carries forward surge return current |
| Cathode | Avalanche clamping node / high-side protection input | Connected to protected line (e.g., battery rail); sinks transient energy into ground via anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use including engine control, BMS, and lighting modules |
| IEC 61000-4-2 Level 4 & ISO 10605 L4 compliance | Guarantees ESD immunity up to ±30 kV contact / ±30 kV air discharge |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Withstands automotive electrical transients including load dump (Pulse 5a/b not supported) |
| UL 94V-0 molding compound | Prevents flame propagation in high-energy fault conditions within enclosed modules |
| JESD 201 Class 2 whisker resistance | Ensures long-term solder joint reliability under thermal cycling in automotive applications |
Applications
| Battery Management System (BMS) | BLDC Motor Drive |
|---|---|
Use Scenario: Protection of cell monitor ICs and communication lines against load dump and inductive kickback during motor commutation. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and monitoring circuitry. Use Value: Limits transient voltage to ≤17.0 V at 176 A, preventing latch-up or damage to 12 V-rated analog front-ends. | Use Scenario: Surge suppression on DC bus and gate-drive supply rails exposed to back-EMF from high-speed rotor switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp on low-impedance power paths feeding motor controllers. Use Value: Absorbs 3000 W pulses without degradation, maintaining <5 µA leakage at 10 V to avoid standby current penalties. |
| Automotive Lighting Module | Switching Mode Power Supply (SMPS) |
Use Scenario: Input-stage protection for LED driver ICs subjected to ISO 7637-2 Pulse 2b (inductive switch-off) and Pulse 3b (capacitive coupling). IC Role / Device Role / Timing Role: Fast-response clamping element on 12 V input rail upstream of buck converter. Use Value: Clamps within nanoseconds to 17.0 V, preserving PWM timing integrity and preventing LED current regulator reset. | Use Scenario: Secondary-side output rail protection in 12 V auxiliary SMPS for infotainment and ADAS subsystems. IC Role / Device Role / Timing Role: Output overvoltage limiter safeguarding downstream logic and sensors. Use Value: Maintains 10 V working voltage margin while delivering 3000 W peak pulse capability, compatible with standard SMC footprint layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | Lower PPPM (600 W), same VBR range (11.4–12.6 V), DO-214AA (SMB) package | Not rated for ISO 7637-2 Pulse 1/2a/2b/3a/3b; limited to consumer-grade surge environments | Select SMBJ12A only for cost-sensitive non-automotive designs where 3000 W surge headroom is unnecessary |
| 1.5KE12A | Higher VC (20.1 V), through-hole DO-201AD package, 1500 W PPPM | Lacks AEC-Q101 qualification and IEC/ISO compliance; unsuitable for automotive PCB space constraints | Choose 1.5KE12A only for legacy through-hole designs requiring field-replaceable components, not for new SMT automotive platforms |
Compared with SMBJ12A and 1.5KE12A, the 3KSMC12AH uniquely combines 3000 W surge rating, AEC-Q101 qualification, full ISO 7637-2 compliance, and DO-214AB SMT packaging-making it the only option validated for under-hood automotive power rail protection where both energy absorption and regulatory conformance are mandatory.
Availability
3KSMC12AH is available at Aetrix Electronics and suitable for battery management systems, BLDC motor drives, automotive lighting modules, and switching mode power supplies requiring stable component supply across automotive OEM and Tier-1 production programs.
Supply support for 3KSMC12AH 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, rectifiers, and MOSFETs, with global distribution and AEC-Q101 validation capabilities.
The 3KSMCxxAH series was developed specifically for automotive-grade transient suppression in 12 V battery architectures, emphasizing high-energy clamping, thermal stability, and regulatory compliance for safety-critical power domains.
FAQ
What is the maximum clamping voltage of the 3KSMC12AH under a 3000 W transient?
The 3KSMC12AH has a maximum clamping voltage (VC) of 17.0 V when subjected to its rated peak pulse current of 176 A, corresponding to the 3000 W (10/1000 µs) transient condition. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during surge events. The 3KSMC12AH maintains this clamping performance across its specified junction temperature range, with temperature coefficient αT = 7.8 × 10−4/°C applied per datasheet formula.
Is the 3KSMC12AH suitable for bidirectional surge protection?
No, the 3KSMC12AH is a unidirectional TVS diode, designed exclusively for suppression of negative-going transients on positive-rail systems. Its polarity is marked by a cathode band, and it does not conduct or clamp in the forward direction beyond typical diode drop. For bidirectional protection, a symmetric device such as the 3KSMC12A (dual-diode configuration) or separate back-to-back arrangement would be required-not the 3KSMC12AH.
Does the 3KSMC12AH meet automotive environmental stress standards?
Yes, the 3KSMC12AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b for automotive electrical disturbances, as well as IEC 61000-4-2 Level 4 and ISO 10605 Level L4 for ESD immunity. These qualifications are confirmed in the official Taiwan Semiconductor documentation for version B2012, making the 3KSMC12AH appropriate for under-hood and chassis-mounted applications.
What is the thermal resistance from junction to lead (RθJL) for the 3KSMC12AH?
The junction-to-lead thermal resistance (RθJL) of the 3KSMC12AH is 17°C/W, measured under standardized conditions using a 16 mm × 16 mm copper pad PCB. This parameter enables accurate thermal modeling of power dissipation during repetitive surge events and supports layout decisions for copper pour area and thermal vias. The 3KSMC12AH's RθJL is significantly lower than comparable SMB-package devices, contributing to its higher steady-state power rating of 8.5 W.
Can the 3KSMC12AH replace the 3KSMC12A in existing designs?
No-the 3KSMC12AH and 3KSMC12A differ in polarity and application scope: the "H" suffix denotes unidirectional construction, while the base "3KSMC12A" part number refers to a bidirectional variant. Substituting 3KSMC12AH for 3KSMC12A would eliminate positive-rail transient protection capability. Layout, schematic, and functional validation are required before interchange; the 3KSMC12AH is not a drop-in replacement for 3KSMC12A.
3KSMC12AH 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):
- 10V (Max)
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 17V
- Current - Peak Pulse (10/1000µs):
- 176A
- 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)
3KSMC12AH FAQ
1.How can I place an order for 3KSMC12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KSMC12AH 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 3KSMC12AH reliable?
The price and inventory of 3KSMC12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KSMC12AH is usually 5 days.
3.What payment methods are accepted for 3KSMC12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KSMC12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KSMC12AH?
3KSMC12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KSMC12AH 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 3KSMC12AH?
For technical support, including 3KSMC12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KSMC12AH requirements.
6.How does Aetrix verify that 3KSMC12AH is sourced from the original manufacturer or authorized distributors?
All 3KSMC12AH 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 3KSMC12AH meets industry standards.
7.What is the process for return or replacement of 3KSMC12AH?
All 3KSMC12AH units undergo pre-shipment inspection (PSI). If there is an issue with 3KSMC12AH, 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 3KSMC12AH part is unused and in its original packaging.
Return procedure for 3KSMC12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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