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Taiwan Semiconductor Corporation 3KSMC18AH
- Part No.:
- 3KSMC18AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KSMC18AH.pdf
- Description:
- 3000W, 17.6V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,636
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Product details
Overview
3KSMC18AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 17.6V typical breakdown voltage (VBR), 24.4V maximum clamping voltage (VC) at 123A peak pulse current, and 175°C maximum junction temperature - deployed for surge protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the 3KSMC18AH datasheet, 3KSMC18AH pinout, 3KSMC18AH application, or 3KSMC18AH equivalent, key selection criteria include unidirectional polarity, 15–18.5V VBR range, 3000W 10/1000µs peak power rating, thermal resistance (RθJL = 17°C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode operates as a unidirectional clamping device, triggered when reverse voltage exceeds its breakdown threshold (16.7–18.5V), limiting transient energy to ≤24.4V at 123A. Its low dynamic resistance (0.055Ω) ensures rapid voltage stabilization during ESD or load-dump events.
Designed for IEC 61000-4-2 Level 4 and ISO 10605 L4 compliance, it supports ISO 7637-2 Pulse 1/2a/2b/3a/3b waveforms and withstands 300A non-repetitive forward surge (8.3ms half-sine), making it suitable for harsh automotive electrical environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 16.7 / 17.6 / 18.5 V - defines precise reverse breakdown onset for accurate overvoltage triggering |
| VC @ IPPM | 24.4 V at 123 A - maximum clamped voltage under 3000W 10/1000µs surge, critical for downstream IC survival |
| PPPM | 3000 W - peak pulse power handling capability per IEC/ISO transient standards |
| RD | 0.055 Ω - low dynamic resistance enables fast, stable clamping with minimal overshoot |
| TJ max | 175 °C - high junction temperature rating supports operation in under-hood automotive locations |
| αT | 8.8 × 10−4/°C - temperature coefficient used to calculate VBR and VC drift across operating range |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Weight: 0.210 g. Molding compound rated UL 94V-0; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to system ground or lower-potential rail during clamping operation |
| Cathode | Current exit terminal in forward bias; marked by band | Connected to protected line (e.g., 12V rail); reverse-biased during surge event |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, HAST, and UHST |
| IEC 61000-4-2 / ISO 10605 Level 4 | Withstands ±15 kV air discharge and ±8 kV contact discharge without degradation |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Robust against coupled transients from inductive switching and alternator load dump |
| Low RD (0.055 Ω) | Minimizes clamping voltage rise under high-current surges, improving protection margin for sensitive loads |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow; simplifies SMT manufacturing |
Applications
| Automotive BLDC Motor Drive | Battery Management System (BMS) |
|---|---|
Use Scenario: Protection of gate drivers and MCU inputs against back-EMF spikes during commutation and regenerative braking. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor phase lines and DC bus to clamp inductive kickback. Use Value: Limits transient voltage to ≤24.4 V at 123 A, preventing latch-up or permanent damage to 3.3V/5V logic interfaces. | Use Scenario: Safeguarding cell monitoring ICs and communication lines (e.g., CAN, UART) from load-dump and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main battery input rail (12–16 V nominal). Use Value: Withstands ISO 7637-2 Pulse 5a (load dump up to 60 V, 400 ms), maintaining BMS uptime and data integrity. |
| LED Lighting Driver | Industrial SMPS Input Stage |
Use Scenario: Surge suppression on constant-current LED driver inputs exposed to outdoor lightning-induced surges. IC Role / Device Role / Timing Role: Front-end clamping device on AC/DC rectified output or DC bus before PFC stage. Use Value: 3000W peak power rating absorbs 10/1000 µs transients without failure, extending driver lifetime in streetlight applications. | Use Scenario: Input-stage protection in 24/48 V industrial switch-mode power supplies subject to grid switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor to limit line-to-ground transients. Use Value: Low 0.055 Ω dynamic resistance ensures <100 ns response, capturing fast-rising surges before upstream fuses open. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A (ON Semiconductor) | Same DO-214AA (SMB) package; 3000W rating; VBR = 20.0–22.2 V; VC = 29.2 V @ 103 A | Higher clamping voltage and wider VBR tolerance reduce protection margin for 18 V nominal rails | Select only if board layout accommodates SMB footprint and higher VC is acceptable |
| SMCJ18A (Littelfuse) | DO-214AB (SMC) package; identical footprint; VBR = 20.0–22.2 V; VC = 29.2 V @ 103 A; no AEC-Q101 listing | Lacks automotive qualification; lower surge current rating (103 A vs. 123 A) reduces margin for ISO 7637-2 Pulse 5a | Acceptable for industrial SMPS but not recommended for automotive BMS or motor control |
Compared with SMBJ18A and SMCJ18A, the 3KSMC18AH delivers tighter VBR (16.7–18.5 V), lower VC (24.4 V), higher IPPM (123 A), and AEC-Q101 certification - making it the preferred choice where precision clamping and automotive compliance are mandatory.
Availability
3KSMC18AH is available at Aetrix Electronics and suitable for automotive BLDC motor drives, battery management systems, and industrial SMPS requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 3KSMC18AH 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 TVS diodes, rectifiers, MOSFETs, and automotive-qualified components.
The 3KSMCxxAH series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting high-energy ISO 7637-2 and IEC 61000-4-2 threats in 12 V and 24 V vehicle architectures.
FAQ
What is the breakdown voltage range for 3KSMC18AH?
The 3KSMC18AH has a guaranteed breakdown voltage (VBR) range of 16.7 V (minimum) to 18.5 V (maximum) at test current IT = 1 A, with a typical value of 17.6 V. This tight tolerance ensures predictable turn-on behavior during overvoltage events and supports precise design margins in 12 V and 18 V nominal systems.
Is 3KSMC18AH suitable for automotive applications?
Yes, the 3KSMC18AH is AEC-Q101 qualified and meets ISO 7637-2 (Pulse 1/2a/2b/3a/3b) and ISO 10605 (Level L4) standards. Its 175°C maximum junction temperature, moisture sensitivity level 1, and robust surge ratings make it appropriate for under-hood and chassis-mounted automotive electronics including motor controllers and BMS modules.
What is the maximum clamping voltage of 3KSMC18AH under surge conditions?
The 3KSMC18AH exhibits a maximum clamping voltage (VC) of 24.4 V when subjected to its rated 3000W peak pulse (10/1000 µs waveform) at 123 A. This value is measured at TA = 25°C and is critical for ensuring protected circuitry remains below absolute maximum voltage ratings during transient events.
Does 3KSMC18AH have a unidirectional or bidirectional configuration?
The 3KSMC18AH is a unidirectional TVS diode, indicated by its single cathode band marking and specified reverse standoff voltage (VWM = 15 V). It conducts only during negative transients on the cathode side and must be oriented with cathode toward the protected line - unlike bidirectional variants that suppress both polarities.
What package type does 3KSMC18AH use, and is it RoHS compliant?
The 3KSMC18AH uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads and UL 94V-0 molding compound. It is RoHS compliant and halogen-free per IEC 61249-2-21, meeting environmental and safety requirements for global automotive and industrial deployments.
3KSMC18AH 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):
- 15V (Max)
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 123A
- 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)
3KSMC18AH FAQ
1.How can I place an order for 3KSMC18AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KSMC18AH 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 3KSMC18AH reliable?
The price and inventory of 3KSMC18AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KSMC18AH is usually 5 days.
3.What payment methods are accepted for 3KSMC18AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KSMC18AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KSMC18AH?
3KSMC18AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KSMC18AH 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 3KSMC18AH?
For technical support, including 3KSMC18AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KSMC18AH requirements.
6.How does Aetrix verify that 3KSMC18AH is sourced from the original manufacturer or authorized distributors?
All 3KSMC18AH 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 3KSMC18AH meets industry standards.
7.What is the process for return or replacement of 3KSMC18AH?
All 3KSMC18AH units undergo pre-shipment inspection (PSI). If there is an issue with 3KSMC18AH, 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 3KSMC18AH part is unused and in its original packaging.
Return procedure for 3KSMC18AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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