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Taiwan Semiconductor Corporation 3KSMC28AH
- Part No.:
- 3KSMC28AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KSMC28AH.pdf
- Description:
- 3000W, 28.1V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,018
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Product details
Overview
3KSMC28AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 28.1V typical breakdown voltage (VBR), 38.9V maximum clamping voltage (VC) at 77.1A 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 3KSMC28AH datasheet, 3KSMC28AH pinout, 3KSMC28AH application, or 3KSMC28AH equivalent, key selection criteria include unidirectional polarity, 26.7–29.5V VBR range, 3000W PPPM rating, thermal resistance RθJL = 17°C/W, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The 3KSMC28AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR window (26.7–29.5V), clamping transients to ≤38.9V at 77.1A (10/1000µs). Its thermal design relies on low RθJL (17°C/W) and RθJC (10°C/W), enabling effective heat transfer to PCB copper pads under repetitive surge stress.
It meets IEC 61000-4-2 Level 4 (±15kV air/±8kV contact), ISO 10605 (330pF/330Ω), and ISO 7637-2 Pulse 1/2a/2b/3a/3b standards - confirming suitability for harsh automotive electrical environments where load dump and inductive switching surges occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 26.7V / 28.1V / 29.5V - defines precise reverse breakdown threshold for reliable overvoltage triggering |
| VC @ IPPM | 38.9V at 77.1A - maximum clamped voltage during 3000W transient, limiting downstream IC stress |
| PPPM | 3000W - peak pulse power handling per 10/1000µs waveform, supporting high-energy surge immunity |
| RθJL | 17°C/W - enables efficient junction-to-lead heat conduction when mounted on 16mm×16mm Cu pad |
| IR @ VWM | 3µA max at 24V - ultra-low leakage ensures minimal standby power loss in battery-critical systems |
| TJ Range | −55°C to +175°C - supports operation in under-hood automotive locations with extreme thermal cycling |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional polarity indicated by cathode band. Weight: 0.210g. Molding compound UL 94V-0 rated; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry under forward bias; reference node for reverse surge path | Connected to system ground or low-side return path during clamping |
| Cathode | Current exit under forward bias; high-voltage terminal during reverse surge | Connected to protected line (e.g., 24V rail); cathode band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements (HTOL, TC, HAST, etc.) |
| IEC 61000-4-2 Level 4 compliance | Withstands ±15kV air discharge and ±8kV contact discharge without degradation |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity | Protects against load dump, alternator transients, and inductive switch-off spikes |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green 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 voltage excursion to ≤38.9V, preventing damage to 40V-rated MOSFETs and isolated gate drivers. | Use Scenario: Safeguarding cell monitoring ICs and communication interfaces (e.g., CAN, UART) from ESD and load dump events in 12V/24V battery packs. IC Role / Device Role / Timing Role: Primary surge suppression at main battery input and module interconnects. Use Value: Maintains signal integrity under ISO 10605 (330pF/330Ω) and ISO 7637-2 Pulse 5a (load dump), ensuring BMS uptime. |
| LED Lighting Driver | Industrial SMPS Input Stage |
Use Scenario: Guarding constant-current LED drivers against lightning-induced surges on AC mains or 24V DC distribution lines. IC Role / Device Role / Timing Role: Front-end clamping device parallel to bulk capacitor and upstream of PFC controller. Use Value: Absorbs 3000W transients without failure, preserving driver ICs rated for ≤40V operating voltage. | Use Scenario: Input-stage overvoltage protection in 24V/48V industrial switch-mode power supplies exposed to grid transients and relay bounce. IC Role / Device Role / Timing Role: Fast-response TVS across primary-side DC link before PWM controller and transformer. Use Value: Clamps 10/1000µs surges to 38.9V within nanoseconds, preventing controller latch-up or MOSFET avalanche failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A | Lower PPPM (600W), same VBR range (26.7–29.5V), SMB package (smaller footprint, higher RθJA) | Not suitable for 3000W load dump; limited to lower-energy ESD/surge events | Select only if system-level surge energy is confirmed ≤600W and space constraints favor SMB. |
| 1.5KE28A | Higher VC (48.4V), through-hole DO-201AD package, 1500W PPPM, no AEC-Q101 qualification | Lacks automotive qualification and fails ISO 7637-2 Pulse 5a; unsuitable for under-hood use | Acceptable only for non-automotive industrial applications with lower clamping voltage margin tolerance. |
Compared with SMBJ28A and 1.5KE28A, the 3KSMC28AH delivers 5× higher surge power handling, AEC-Q101 validation, and optimized thermal performance in SMC package - making it the sole choice for automotive-grade 24V system protection where 3000W transients must be reliably suppressed.
Availability
3KSMC28AH is available at Aetrix Electronics and suitable for automotive BLDC motor drives, battery management systems, LED lighting drivers, and industrial SMPS requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 3KSMC28AH 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 engineered specifically for AEC-Q101-compliant transient suppression in 12V–48V automotive subsystems - emphasizing robustness against ISO 7637-2 pulses, low clamping voltage, and high-reliability packaging for under-hood deployment.
FAQ
What is the maximum clamping voltage of the 3KSMC28AH under a 3000W transient?
The 3KSMC28AH has a maximum clamping voltage (VC) of 38.9V at 77.1A peak pulse current, measured with a 10/1000µs waveform. This value is guaranteed across the full operating temperature range and forms the basis for downstream circuit voltage margining. The 3KSMC28AH achieves this clamping performance while maintaining unidirectional polarity and AEC-Q101 qualification.
Is the 3KSMC28AH suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the 3KSMC28AH is explicitly tested and compliant with ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b - covering key automotive transient threats including load dump, supply interruption, and inductive switching. Its AEC-Q101 qualification and 175°C TJMAX further confirm suitability for under-hood automotive use. The 3KSMC28AH meets these standards without derating in standard mounting conditions.
What is the marking code for the 3KSMC28AH and how is polarity identified?
The 3KSMC28AH is marked "3K28A" on the device body. Polarity is unidirectional and indicated by a distinct cathode band on the package end - the banded end is the cathode terminal, which connects to the protected line (e.g., 24V rail), while the opposite end is the anode, tied to ground. This marking and banding follow JEDEC DO-214AB conventions and are verified in the official Taiwan Semiconductor package outline drawing.
Does the 3KSMC28AH have halogen-free and RoHS compliance documentation?
Yes, the 3KSMC28AH is both RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. These environmental qualifications are stated in the official Taiwan Semiconductor datasheet revision B2012 and confirmed in the "Features" section. The 3KSMC28AH uses molding compound meeting UL 94V-0 flammability rating and matte tin-plated leads compliant with J-STD-002.
What is the thermal resistance from junction to lead (RθJL) for the 3KSMC28AH?
The junction-to-lead thermal resistance (RθJL) of the 3KSMC28AH is 17°C/W, measured under standardized conditions using a 16mm × 16mm copper pad PCB test board. This low value enables efficient heat transfer from the silicon die to the PCB copper, supporting sustained surge duty cycles. The 3KSMC28AH's RθJL is critical for thermal design in high-power automotive protection circuits.
3KSMC28AH 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):
- 24V (Max)
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 77.1A
- 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)
3KSMC28AH FAQ
1.How can I place an order for 3KSMC28AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KSMC28AH 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 3KSMC28AH reliable?
The price and inventory of 3KSMC28AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KSMC28AH is usually 5 days.
3.What payment methods are accepted for 3KSMC28AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KSMC28AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KSMC28AH?
3KSMC28AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KSMC28AH 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 3KSMC28AH?
For technical support, including 3KSMC28AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KSMC28AH requirements.
6.How does Aetrix verify that 3KSMC28AH is sourced from the original manufacturer or authorized distributors?
All 3KSMC28AH 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 3KSMC28AH meets industry standards.
7.What is the process for return or replacement of 3KSMC28AH?
All 3KSMC28AH units undergo pre-shipment inspection (PSI). If there is an issue with 3KSMC28AH, 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 3KSMC28AH part is unused and in its original packaging.
Return procedure for 3KSMC28AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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