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Taiwan Semiconductor Corporation 3KSMC35AH
- Part No.:
- 3KSMC35AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KSMC35AH.pdf
- Description:
- 3000W, 35.1V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,945
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Product details
Overview
3KSMC35AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 35V breakdown voltage (VBR = 33.3–36.9V), 48.4V clamping voltage at 62A peak pulse current, and DO-214AB (SMC) package. It delivers automotive-grade surge protection for 12V–48V systems including BLDC motor drives and battery management circuits.
For engineers reviewing the 3KSMC35AH datasheet, 3KSMC35AH pinout, 3KSMC35AH application, or 3KSMC35AH 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, and 175°C maximum junction temperature.
Technical Context
The 3KSMC35AH operates as a unidirectional avalanche diode, triggered by reverse-biased overvoltage events. Its 33.3–36.9V VBR range ensures precise turn-on under transient conditions, while the 48.4V VC at 62A IPPM defines its clamping performance during 10/1000µs surges.
Thermal design relies on RθJL = 17°C/W and RθJA = 50°C/W (on 16mm × 16mm Cu pad), supporting sustained operation up to 175°C junction temperature. Its 0.215Ω dynamic resistance (RD) enables low-voltage overshoot control during fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 33.3 / 35.1 / 36.9 V - Ensures reliable conduction onset across temperature and unit variation |
| VC @ IPPM | 48.4 V @ 62 A - Limits downstream voltage to safe levels during 3000W 10/1000µs surge |
| PPPM | 3000 W - Withstands high-energy automotive load dump and inductive switching events |
| RD | 0.215 Ω - Minimizes clamping voltage rise under increasing surge current |
| TJ max | +175 °C - Enables use in under-hood automotive environments without derating |
| IR @ VWM | 3 µA @ 30 V - Guarantees low leakage in 24–32V nominal rail applications |
| αT | 9.9 × 10−4/°C - Allows accurate VBR/VC temperature compensation in thermal modeling |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Weight: 0.210 g. Molding compound meets UL 94V-0; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lower-potential rail; forms return path during clamping |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24V supply rail); conducts avalanche current when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements (HTOL, TC, HTRB, etc.) |
| IEC 61000-4-2 Level 4 & ISO 10605 L4 compliant | Withstands ±15 kV air / ±8 kV contact discharge and ±30 kV component-level ESD |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity | Protects against load dump, alternator transients, and inductive switch-off spikes in 12V/24V networks |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally restricted substances |
| Junction-to-lead thermal resistance | RθJL = 17°C/W - Enables efficient heat transfer to PCB copper pour for sustained power handling |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses voltage spikes generated during PWM commutation and regenerative braking in 24–48V BLDC inverters. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or gate driver supply rails to clamp transients before they damage MOSFETs or controllers. Use Value: Prevents false triggering and latch-up in motor control ICs by limiting bus overvoltage to ≤48.4V during 62A surges. | Use Scenario: Guards cell monitoring ICs and communication interfaces (e.g., CAN, UART) against coupling from high-current charge/discharge paths. IC Role / Device Role / Timing Role: Standoff-rated TVS on analog front-end inputs and isolated data lines to absorb coupled transients without leakage-induced measurement drift. Use Value: Maintains <3 µA leakage at 30V, ensuring minimal impact on precision voltage sensing and coulomb counting accuracy. |
| Automotive Lighting Control | Switching Mode Power Supply (SMPS) |
Use Scenario: Protects LED driver ICs and microcontrollers in headlamp modules subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device on 12V input rail upstream of DC-DC converters and LED current regulators. Use Value: Clamps 3000W pulses within 10/1000µs envelope, preventing latch-up or permanent damage to sensitive lighting ASICs. | Use Scenario: Safeguards primary-side controller ICs and secondary-side rectifiers in industrial AC-DC adapters and telecom PSUs. IC Role / Device Role / Timing Role: Input-stage TVS on bulk capacitor rail to absorb line surges and ringing from transformer leakage inductance. Use Value: Delivers 48.4V clamping at 62A with 0.215Ω RD, minimizing overshoot during fast-switching events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | Lower PPPM (600W), higher VC (53.3V @ 11.3A), SMB package (smaller thermal mass) | Not suitable for ISO 7637-2 Pulse 5a (load dump); limited to lower-energy surges | Select only for cost-sensitive non-automotive applications where 3000W rating is unnecessary |
| SMCJ33A | Same DO-214AB package, but 1500W PPPM and 53.3V VC @ 28.2A; no AEC-Q101 qualification | Lacks automotive qualification and full ISO 7637-2 coverage; requires external qualification testing | Acceptable for industrial SMPS if AEC-Q101 and Pulse 5a compliance are not required |
Compared with SMBJ33A and SMCJ33A, the 3KSMC35AH provides 2× higher surge power rating, 4.9V lower clamping voltage at rated current, and factory-certified AEC-Q101/ISO 7637-2 compliance-making it the only drop-in solution for automotive-grade 24–36V rail protection without layout or thermal redesign.
Availability
3KSMC35AH is available at Aetrix Electronics and suitable for automotive lighting control, BLDC motor drive protection, and battery management systems requiring stable component supply across extended temperature and lifecycle demands.
Supply support for 3KSMC35AH 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, serving global automotive, industrial, and consumer markets since 1979.
The 3KSMCxxAH series was developed specifically for AEC-Q101-compliant transient suppression in 12V–48V automotive subsystems, emphasizing robustness against ISO 7637-2 pulses and long-term reliability under thermal cycling.
FAQ
What is the maximum clamping voltage of the 3KSMC35AH under standard test conditions?
The 3KSMC35AH has a maximum clamping voltage (VC) of 48.4 V at 62 A peak pulse current using the 10/1000 µs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The 3KSMC35AH maintains this clamping performance across its specified operating temperature range due to its temperature coefficient αT = 9.9 × 10−4/°C.
Is the 3KSMC35AH suitable for bidirectional signal line protection?
No, the 3KSMC35AH is a unidirectional TVS diode, designed exclusively for DC rail protection where polarity is fixed (e.g., +24V supply to ground). It does not provide symmetrical clamping for AC or bidirectional data lines. For such applications, a dedicated bidirectional part like the 3KSMC33CA must be selected. The 3KSMC35AH's cathode-band marking and electrical asymmetry confirm its unidirectional function.
Does the 3KSMC35AH meet automotive qualification standards?
Yes, the 3KSMC35AH is AEC-Q101 qualified and fully compliant with ISO 10605 (L4), IEC 61000-4-2 (Level 4), and ISO 7637-2 (Pulse 1, 2a, 2b, 3a, 3b). These certifications are documented in Taiwan Semiconductor's official qualification reports and apply directly to the 3KSMC35AH device, not just the family. Its DO-214AB package and 175°C TJ rating further support under-hood deployment.
What is the leakage current specification for the 3KSMC35AH at its working voltage?
The 3KSMC35AH specifies a maximum reverse leakage current (IR) of 3 µA at VWM = 30 V and TA = 25°C. This low leakage ensures minimal power loss and avoids interference with precision analog circuits such as battery voltage monitors or current-sense amplifiers in BMS designs. Leakage remains within specification up to the full operating temperature range of −55°C to +175°C.
Can the 3KSMC35AH be used in place of the 3KSMC33AH or 3KSMC36AH?
The 3KSMC35AH is not a direct replacement for 3KSMC33AH or 3KSMC36AH due to differences in VBR (33.3–36.9V vs. 31.1–34.3V or 36.7–40.5V) and corresponding VC (48.4V vs. 45.4V or 53.3V). Substituting requires verification that the new clamping voltage aligns with downstream IC absolute maximum ratings. The 3KSMC35AH should only replace other variants after confirming system-level surge margin and tolerance stack-up.
3KSMC35AH 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):
- 30V (Max)
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 62A
- 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)
3KSMC35AH FAQ
1.How can I place an order for 3KSMC35AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KSMC35AH 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 3KSMC35AH reliable?
The price and inventory of 3KSMC35AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KSMC35AH is usually 5 days.
3.What payment methods are accepted for 3KSMC35AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KSMC35AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KSMC35AH?
3KSMC35AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KSMC35AH 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 3KSMC35AH?
For technical support, including 3KSMC35AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KSMC35AH requirements.
6.How does Aetrix verify that 3KSMC35AH is sourced from the original manufacturer or authorized distributors?
All 3KSMC35AH 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 3KSMC35AH meets industry standards.
7.What is the process for return or replacement of 3KSMC35AH?
All 3KSMC35AH units undergo pre-shipment inspection (PSI). If there is an issue with 3KSMC35AH, 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 3KSMC35AH part is unused and in its original packaging.
Return procedure for 3KSMC35AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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