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Taiwan Semiconductor Corporation 1K5SMPC51APH
- Part No.:
- 1K5SMPC51APH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
1K5SMPC51APH.pdf
- Description:
- 1500W, 51V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
1K5SMPC51APH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode rated for 51 V breakdown voltage (VBR = 48.5–53.6 V), 1500 W peak pulse power (10/1000 µs), and 21.4 A peak pulse current (IPPM). It operates across –55 °C to +175 °C junction temperature and is qualified to AEC-Q101 for automotive-grade reliability in high-energy surge environments such as BLDC motor drives and battery management systems.
For engineers reviewing the 1K5SMPC51APH datasheet, 1K5SMPC51APH pinout, 1K5SMPC51APH application, or 1K5SMPC51APH equivalent, key selection criteria include its 43.6 V stand-off voltage (VWM), 70.1 V clamping voltage at IPPM, unidirectional polarity, TO-277A (SMPC4.6U) package, and compliance with ISO 7637-2 (Pulse 1/2a/2b/3a/3b) and IEC 61000-4-2 Level 4.
Technical Context
This TVS diode employs a silicon avalanche structure optimized for fast response (<1 ns) to transient overvoltages and robust energy handling under repetitive or single-pulse stress. Its unidirectional configuration provides reverse-biased clamping only, with low leakage (<1 µA at VWM) and stable breakdown voltage temperature coefficient (αT = 0.093 %/°C).
Thermal performance is defined by RθJL = 6.4 °C/W (junction-to-lead) and RθJA = 51.1 °C/W on a 16 mm × 16 mm Cu pad PCB - enabling reliable operation up to TJ = 175 °C in space-constrained automotive and industrial power electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 48.5 / 51.0 / 53.6 V - precise breakdown threshold ensures consistent clamping onset across production lots and temperature |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | 70.1 V - clamping voltage during 1500 W, 10/1000 µs surge limits downstream component stress |
| PPPM | 1500 W - peak pulse power rating defines maximum transient energy absorption capability |
| IPPM | 21.4 A - peak surge current capacity at specified waveform, critical for ISO 7637-2 Pulse 5a compliance |
| TJ max | +175 °C - extended junction temperature rating supports under-hood automotive placement without derating |
| αT | 0.093 %/°C - temperature coefficient enables accurate VBR prediction across operating range using VBR(TJ) = VBR(25°C) × [1 + αT(TJ − 25)] |
Pinout & Package
Package: TO-277A (SMPC4.6U), surface-mount, unidirectional, matte tin-plated leads, UL 94V-0 molding compound, 0.095 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 3) | Current entry terminal in forward bias; reference node for reverse-biased clamping | Connected to system ground or low-side return path; defines polarity orientation during PCB layout |
| Cathode 1 (Pin 1) | Primary clamping terminal for reverse voltage transients | Connected to protected line (e.g., battery rail); carries full IPPM during surge events |
| Cathode 2 (Pin 2) | Secondary cathode terminal tied internally to Cathode 1 | Provides redundant solder joint and lower inductance path; must be routed to same net as Pin 1 for optimal ESD/EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS subsystems |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees immunity to load dump, inductive switching, and supply line transients in 12 V/24 V vehicle networks |
| IEC 61000-4-2 Level 4 & ISO 10605 L4 | Withstands ±15 kV air discharge and ±8 kV contact discharge ESD events without degradation |
| TO-277A thermal performance (RθJL = 6.4 °C/W) | Enables efficient heat transfer to PCB copper, supporting high-reliability operation in thermally dense layouts |
| Halogen-free & RoHS compliant | Meets automotive environmental standards (IEC 61249-2-21) and end-of-life recycling requirements |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback and commutation spikes on gate driver supply rails and phase outputs of 3-phase BLDC inverters. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or gate drive lines to clamp transients below MOSFET VDSS and driver IC absolute maximum ratings. Use Value: Prevents false triggering and latch-up in half-bridge drivers by limiting voltage overshoot to ≤70.1 V during 21.4 A surges. | Use Scenario: Protects cell monitoring ICs, Coulomb counters, and communication interfaces from load dump and hot-swap transients in 48 V and 51 V battery packs. IC Role / Device Role / Timing Role: Standoff-rated TVS on main pack voltage input and module interconnect lines to absorb ISO 7637-2 Pulse 5a energy. Use Value: Maintains VWM = 43.6 V margin above nominal 48 V pack voltage while clamping to 70.1 V during 1500 W surges. |
| Automotive Lighting Control | Industrial SMPS Input Stage |
Use Scenario: Shields LED driver ICs and CAN/LIN transceivers from alternator-induced transients and relay bounce in headlamp and DRL modules. IC Role / Device Role / Timing Role: Primary surge protection device on 12 V/24 V input rails upstream of DC-DC converters and microcontrollers. Use Value: Delivers AEC-Q101 reliability and <1 µA leakage at 43.6 V to preserve low-power sleep mode integrity. | Use Scenario: Safeguards AC-DC and DC-DC converter front-ends against lightning-induced surges and mains switching transients in factory automation power supplies. IC Role / Device Role / Timing Role: High-energy TVS on bulk input capacitor terminals to limit voltage excursion during 10/1000 µs line surges. Use Value: Achieves 1500 W pulse rating with 70.1 V clamping to protect 600 V rectifiers and primary-side controllers without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A | DO-214AC package; lower PPPM = 400 W; VC = 83.5 V at IPPM = 4.8 A | Not AEC-Q101 qualified; limited to non-automotive industrial use | Select when cost sensitivity outweighs automotive qualification and surge energy requirements |
| TPSMD51A | TO-277A package; PPPM = 1500 W; VC = 77.0 V at IPPM = 19.5 A; αT = 0.085 %/°C | Same footprint but higher clamping voltage reduces margin for 51 V systems | Choose if alternate sourcing is required and 77.0 V clamping remains within downstream IC tolerances |
Compared with SMAJ51A and TPSMD51A, the 1K5SMPC51APH offers superior automotive qualification, tighter VBR tolerance (±5%), lower clamping voltage (70.1 V vs. ≥77 V), and higher thermal efficiency (RθJL = 6.4 °C/W), making it optimal for space- and reliability-critical 48–51 V automotive and industrial power nodes.
Availability
1K5SMPC51APH is available at Aetrix Electronics and suitable for BLDC motor drives, battery management systems, and automotive lighting applications requiring stable component supply, AEC-Q101 assurance, and high-energy transient immunity.
Supply support for 1K5SMPC51APH 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 1K5SMPCxAPH series was developed specifically for high-reliability automotive power rail protection, targeting ISO 7637-2 compliance and under-hood thermal resilience in 12 V to 51 V systems.
FAQ
What is the breakdown voltage tolerance of the 1K5SMPC51APH?
The 1K5SMPC51APH has a breakdown voltage (VBR) range of 48.5 V (min) to 53.6 V (max) at IT = 1.0 mA, yielding a ±5% tolerance around the nominal 51 V rating. This tight spread ensures predictable clamping behavior across temperature and production batches, critical for protecting 48 V battery systems where overvoltage margin is constrained.
Is the 1K5SMPC51APH suitable for bidirectional transient suppression?
No, the 1K5SMPC51APH is a unidirectional TVS diode and only clamps reverse-biased transients. It must be oriented with cathode toward the protected line and anode to ground. For bidirectional protection (e.g., data lines), a separate symmetric device like a dual-diode array or a dedicated bidirectional TVS would be required - the 1K5SMPC51APH does not provide forward conduction clamping.
What is the maximum clamping voltage of the 1K5SMPC51APH under surge conditions?
The 1K5SMPC51APH exhibits a maximum clamping voltage (VC) of 70.1 V when subjected to its rated 1500 W peak pulse power (10/1000 µs waveform). This value is measured at IPPM = 21.4 A and defines the upper voltage limit imposed on protected circuitry during worst-case transients, ensuring compatibility with 75 V-rated downstream components.
Does the 1K5SMPC51APH require derating at elevated ambient temperatures?
Yes, the 1K5SMPC51APH's peak pulse power must be derated above TA = 25 °C per Figure 1 in the datasheet. At 125 °C ambient, its usable PPPM drops to approximately 750 W. Designers must apply thermal modeling using RθJA = 51.1 °C/W and RθJL = 6.4 °C/W to ensure TJ remains ≤175 °C under combined DC leakage and surge conditions.
How is the 1K5SMPC51APH marked on the package?
The 1K5SMPC51APH is laser-marked with "SMPC51AP" as the device marking code, followed by date code (YW) and factory code (F) per the official marking diagram. This 6-character identifier enables traceability and distinguishes it from other variants in the 1K5SMPC12APH–1K5SMPC51APH family, confirming its 51 V VBR rating and B2109 revision level.
1K5SMPC51APH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- TO-277, 3-PowerDFN
- Series:
- 1K5SMPC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMPC4.6U
1K5SMPC51APH FAQ
1.How can I place an order for 1K5SMPC51APH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1K5SMPC51APH 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 1K5SMPC51APH reliable?
The price and inventory of 1K5SMPC51APH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1K5SMPC51APH is usually 5 days.
3.What payment methods are accepted for 1K5SMPC51APH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1K5SMPC51APH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1K5SMPC51APH?
1K5SMPC51APH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1K5SMPC51APH 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 1K5SMPC51APH?
For technical support, including 1K5SMPC51APH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1K5SMPC51APH requirements.
6.How does Aetrix verify that 1K5SMPC51APH is sourced from the original manufacturer or authorized distributors?
All 1K5SMPC51APH 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 1K5SMPC51APH meets industry standards.
7.What is the process for return or replacement of 1K5SMPC51APH?
All 1K5SMPC51APH units undergo pre-shipment inspection (PSI). If there is an issue with 1K5SMPC51APH, 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 1K5SMPC51APH part is unused and in its original packaging.
Return procedure for 1K5SMPC51APH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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