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Taiwan Semiconductor Corporation 1.5KE51C
- Part No.:
- 1.5KE51C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51C.pdf
- Description:
- 1500W, 51V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,193
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Product details
Overview
1.5KE51C from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, with 51V nominal breakdown voltage (VBR = 45.9–56.1V @ 1mA), 41.3V working stand-off voltage (VWM), and 73.5V maximum clamping voltage (VC @ IPP = 21A). It delivers fast response (<1.0ps), low dynamic impedance, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and EFT protection.
For engineers reviewing the 1.5KE51C datasheet, 1.5KE51C pinout, 1.5KE51C application, or 1.5KE51C equivalent, this page provides verified electrical parameters, DO-201 terminal polarity, clamping performance under 10/1000μs surge, junction temperature limits (−55°C to +175°C), and AEC-Q101-qualified alternatives for automotive-grade transient suppression.
Technical Context
The 1.5KE51C operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds VBR while blocking up to 41.3V in normal operation. Its 1500W peak pulse power rating is defined at TA = 25°C per 10/1000μs waveform, with derating above ambient temperature per Fig.2.
It exhibits low leakage current (<1μA @ VWM), 0.102%/°C VBR temperature coefficient, and forward voltage of 3.5V @ 50A - consistent with devices having VBR ≤ 200V. Polarity is marked by cathode band; no internal series resistance or integrated thermal shutdown is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT | 45.9–56.1V @ 1mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 41.3V - maximum continuous reverse voltage before leakage rises significantly; sets system operating margin |
| VC @ IPP | 73.5V @ 21A - clamped voltage during 10/1000μs surge; determines protected circuit's max stress level |
| PPK | 1500W - peak surge power handling capability at TA = 25°C; critical for load-dump immunity |
| TJ max | +175°C - maximum junction temperature; enables high-ambient automotive under-hood use |
| IR @ VWM | <1μA - ultra-low reverse leakage ensures minimal standby power loss in battery-critical systems |
| Response time | <1.0ps - sub-picosecond turn-on enables protection against nanosecond-scale ESD/EFT transients |
Pinout & Package
Package: DO-201 axial lead package with pure tin-plated leads (J-STD-002 compliant), UL 94V-0 molding compound, and cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail; carries full surge current during clamping |
| Cathode | Reverse-biased input terminal | Connected to protected line (e.g., 12V rail); voltage referenced to anode during transient events |
Key Features
| Feature | Design Value |
|---|---|
| 1500W surge rating | Supports ISO 7637-2 Pulse 5a (load dump) without degradation in automotive 12V systems |
| Clamping ratio (VC/VBR) | ~1.42 - tight ratio ensures predictable overvoltage limiting with minimal design margin overhead |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Low dynamic impedance | Enables stable clamping under high di/dt surges, reducing voltage overshoot during fast transients |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally regulated production |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump transients on 12V vehicle battery lines during alternator disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ECUs to clamp spikes up to 120V for <100ms. Use Value: Limits voltage seen by downstream regulators and microcontrollers to ≤73.5V, preventing latch-up or gate oxide damage. | Use Scenario: Protecting analog sensor inputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Placed at connector entry point to shunt fast transients before reaching precision ADC front-end. Use Value: Sub-1ps response ensures clamping occurs before sensitive CMOS input structures experience breakdown. |
| LED Driver Overvoltage Clamp | Power Supply Input Stage Protection |
Use Scenario: Safeguarding constant-current LED drivers from inductive kickback during MOSFET switching. IC Role / Device Role / Timing Role: Connected across driver output to absorb energy from parasitic inductance in PCB traces and cables. Use Value: 1500W rating handles repetitive 10/1000μs surges common in automotive lighting modules without thermal runaway. | Use Scenario: Front-end protection for AC/DC or DC/DC converters exposed to lightning-induced surges on industrial mains lines. IC Role / Device Role / Timing Role: First-stage clamping device upstream of bridge rectifier and bulk capacitor. Use Value: 41.3V VWM allows safe operation across 36V nominal DC bus systems while clamping >73.5V threats. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ51A | Same DO-214AC (SMA) package; 51V VBR (48.5–53.6V), 70.1V VC, 1500W rating; surface-mount vs. axial DO-201 | Requires PCB re-layout; better suited for space-constrained SMT designs but lacks AEC-Q101 option in base grade | Select for automated assembly where board area is limited and thermal pad access supports higher power dissipation |
| Vishay 1.5KE51A | Identical DO-201 package, same 51V nominal rating, VBR 48.5–53.6V, VC 70.1V; AEC-Q101 qualified variant available (1.5KE51AH) | Direct form-fit replacement with identical mounting and lead spacing; validated for same automotive test pulses | Preferred for drop-in validation in existing DO-201 footprints requiring zero layout change and certified AEC-Q101 compliance |
Compared with 1.5KE51C, SMAJ51A offers SMT compatibility at the cost of mechanical robustness and thermal mass, while 1.5KE51A provides identical through-hole implementation with optional AEC-Q101 certification - making it ideal for legacy automotive redesigns requiring no hardware revision.
Availability
1.5KE51C is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED driver circuits, and power supply input stages requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1.5KE51C 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 thyristors, with global distribution and AEC-Q101 qualification capabilities.
The 1.5KE series was designed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing rugged DO-201 packaging, ISO 7637-2 compliance, and extended temperature operation up to +175°C.
FAQ
What is the clamping voltage of the 1.5KE51C under a 10/1000μs surge?
The 1.5KE51C has a maximum clamping voltage (VC) of 73.5V at a peak impulse current (IPP) of 21A under the standard 10/1000μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The 1.5KE51C maintains this clamping performance across its specified junction temperature range and is validated for repeated surge exposure within its derating curve.
Is the 1.5KE51C unidirectional or bidirectional?
1.5KE51C is a unidirectional transient voltage suppressor, indicated by the "C" suffix and confirmed by its single cathode band marking and electrical specifications - including forward voltage (VF = 3.5V @ 50A) and absence of symmetrical bidirectional VBR data. It blocks up to 41.3V in reverse bias and conducts only during negative transients relative to its cathode, making it suitable for DC rail protection where polarity is fixed.
Does the 1.5KE51C meet AEC-Q101 reliability standards?
The base 1.5KE51C is not AEC-Q101 qualified; however, Taiwan Semiconductor offers the AEC-Q101-compliant variant 1.5KE51CH (with "H" suffix) in the same DO-201 package. This version undergoes stress testing per AEC-Q101 including HTSL, TC, UHAST, and bond wire pull tests, and is approved for automotive powertrain and chassis applications. Always verify the suffix and ordering code when selecting for automotive use.
What is the maximum operating temperature for the 1.5KE51C?
The 1.5KE51C has a maximum junction temperature (TJ) of +175°C and a storage temperature range of −55°C to +175°C. Its DO-201 package supports thermal dissipation in high-ambient environments such as automotive engine compartments or industrial motor drives. Derating of peak pulse power must be applied above TA = 25°C per the manufacturer's pulse derating curve (Fig.2), with full 1500W capability only at 25°C ambient.
How does the 1.5KE51C compare to the 1.5KE51A variant?
The 1.5KE51C and 1.5KE51A share identical DO-201 packaging and 51V nominal rating, but differ in breakdown voltage tolerance: 1.5KE51C specifies VBR = 45.9–56.1V, while 1.5KE51A tightens this to 48.5–53.6V. This results in a lower VC of 70.1V for 1.5KE51A versus 73.5V for 1.5KE51C, offering improved clamping margin. Both exhibit the same 1500W rating and thermal specs, but only 1.5KE51A has an AEC-Q101-qualified version (1.5KE51AH).
1.5KE51C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 41.3V
- Voltage - Breakdown (Min):
- 45.9V
- Voltage - Clamping (Max) @ Ipp:
- 73.5V
- Current - Peak Pulse (10/1000µs):
- 21A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE51C FAQ
1.How can I place an order for 1.5KE51C through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51C 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 1.5KE51C reliable?
The price and inventory of 1.5KE51C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51C is usually 5 days.
3.What payment methods are accepted for 1.5KE51C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51C?
1.5KE51C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51C 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 1.5KE51C?
For technical support, including 1.5KE51C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51C requirements.
6.How does Aetrix verify that 1.5KE51C is sourced from the original manufacturer or authorized distributors?
All 1.5KE51C 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 1.5KE51C meets industry standards.
7.What is the process for return or replacement of 1.5KE51C?
All 1.5KE51C units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51C, 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 1.5KE51C part is unused and in its original packaging.
Return procedure for 1.5KE51C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51C Tags
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