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Taiwan Semiconductor Corporation 1.5KE51A
- Part No.:
- 1.5KE51A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51A.pdf
- Description:
- TVS 1500W 51.1V 5% UNIDIR DO-201
- Quantity:
- Payment:
- Shipping:
Inventory:7,505
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Product details
Overview
1.5KE51A from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 51V, working stand-off voltage of 43.6V, clamping voltage of 70.1V at 22A peak pulse current, and DO-201 axial package - designed for automotive-grade inductive load switching protection in engine control units and powertrain modules.
For engineers reviewing the 1.5KE51A datasheet, 1.5KE51A pinout, 1.5KE51A application, or 1.5KE51A equivalent, this part delivers AEC-Q101-qualified surge immunity per ISO 7637-2 Pulse 1/2a/2b/3a/3b, sub-1ps response to transients, and low dynamic impedance for robust ESD and load-dump suppression in 12V/24V automotive systems.
Technical Context
The 1.5KE51A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 48.5–53.6V breakdown range at 1mA test current. It clamps transient energy within 70.1V at 22A (10/1000μs waveform), limiting stress on downstream ICs during load dump or inductive kick events.
Its DO-201 package supports 5W steady-state dissipation at 75°C lead temperature, junction temperature rating of −55°C to +175°C, and meets JESD201 Class 2 whisker resistance - enabling reliable operation in under-hood automotive environments with high thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 48.5–53.6V - precise avalanche threshold ensures consistent turn-on before system overvoltage damage occurs |
| VWM | 43.6V - maximum continuous reverse operating voltage; allows safe margin below VBR in 48V rail applications |
| VC @ IPP=22A | 70.1V - clamping voltage limits downstream voltage stress during 1500W transient events |
| PPK | 1500W - peak pulse power rating at 10/1000μs waveform defines surge handling capability for ISO 7637-2 compliance |
| IPP | 22A - peak impulse current capacity determines survivability against high-energy transients like load dump |
| TJ max | +175°C - extended junction temperature enables placement near heat sources in automotive ECUs |
| Response time | <1.0ps - ultrafast avalanche response prevents voltage overshoot before clamping engages |
Pinout & Package
DO-201 axial package with cathode band marking; leads are pure tin plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating. Weight: 0.090g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / ground reference | Connected to system ground or low-side return; conducts forward current during fault conditions |
| Cathode | Transient clamping node | Connected to protected line (e.g., battery feed); avalanche conduction begins here when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing per JEDEC standards |
| 1500W surge rating (10/1000μs) | Withstands ISO 7637-2 Pulse 5a (load dump) up to 120V/100ms without degradation |
| Clamping voltage ≤70.1V at 22A | Ensures protected ICs (e.g., MCU I/O, CAN transceivers) remain below absolute maximum ratings during transients |
| Leakage current ≤1μA @ 43.6V | Minimizes standby power loss and avoids false triggering in always-on vehicle networks |
| DO-201 mechanical robustness | Supports automated insertion and reflow; withstands 9.5mm lead bending per JESD22-B108 |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Lighting Driver Output Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 120V, 100ms) generated by alternator field-circuit interruption in 12V/24V vehicle electrical systems. IC Role / Device Role: Unidirectional TVS placed between battery rail and ECU input filter capacitor to clamp overvoltage before DC-DC converter input stage. Use Value: Prevents permanent damage to buck controller ICs and microcontrollers by limiting voltage to ≤70.1V during ISO 7637-2 Pulse 5a events. |
Use Scenario: Protects LED driver IC outputs from inductive kickback when driving solenoid-based headlamp leveling actuators or adaptive front-lighting motors. IC Role / Device Role: Mounted across motor coil terminals or driver output pins to absorb flyback energy during PWM switching transitions. Use Value: Eliminates need for external freewheeling diodes while maintaining fast turn-off response and reducing board space vs. RC snubbers. |
| Body Control Module (BCM) LIN Bus Line Protection | Start-Stop System Battery Monitoring Circuit Protection |
Use Scenario: Shields LIN transceiver I/O pins from ESD (±8kV contact) and coupled transients from nearby high-current circuits (e.g., window lift motors). IC Role / Device Role: Placed in series with LIN bus line, referenced to local ground, leveraging low capacitance (<100pF) to preserve signal integrity at 19.2kbps. Use Value: Maintains LIN communication reliability without signal distortion or timing jitter, meeting ISO 17987-4 EMC requirements. |
Use Scenario: Guards analog voltage-sense inputs of battery monitoring ICs (e.g., TI BQ769x0) against jump-start surges (up to 28V sustained) and alternator ripple spikes. IC Role / Device Role: Connected between sense line and ground, with VWM = 43.6V ensuring no conduction during normal 12V/24V operation while clamping overvoltage. Use Value: Preserves measurement accuracy of cell voltage and state-of-charge algorithms by preventing input saturation or latch-up in precision ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | DO-214AA package, 600W rating, VC = 85V @ 7.2A - lower peak power and higher clamping voltage than 1.5KE51A | Preferred for space-constrained PCB layouts where surface-mount is required; less suitable for high-energy load dump | Select SMBJ51A only when board area is critical and surge energy is limited to ≤600W (e.g., infotainment USB ports) |
| SMCJ51A | DO-214AB package, 1500W rating, VC = 87.1V @ 17.2A - same power rating but 24% higher clamping voltage than 1.55KE51A | Better suited for industrial PLC I/O protection where layout allows larger SMC footprint and higher clamping is acceptable | Choose SMCJ51A if DO-201 axial mounting is unavailable and 87.1V clamping does not violate downstream IC absolute max ratings |
Compared with SMBJ51A and SMCJ51A, the 1.5KE51A offers the lowest clamping voltage (70.1V) among 1500W-class TVS diodes in axial form, making it optimal for protecting voltage-sensitive automotive MCUs and analog sensor interfaces where margin to 75V absolute maximum is minimal.
Availability
1.5KE51A is available at Aetrix Electronics and suitable for automotive powertrain control, lighting driver protection, and body electronics requiring stable component supply with AEC-Q101 qualification and long-term lifecycle support.
Supply support for 1.5KE51A 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, and rectifiers with global automotive and industrial certifications.
The 1.5KE series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing high surge robustness, tight VBR tolerance, and thermal stability across −55°C to +175°C.
FAQ
What is the exact breakdown voltage range of the 1.5KE51A?
The 1.5KE51A has a guaranteed breakdown voltage range of 48.5V to 53.6V at 1mA test current (VBR @ IT = 1mA), measured per ANSI/IEEE C62.35. This tight 10.6% tolerance ensures predictable clamping behavior in safety-critical automotive circuits where overvoltage margin must be precisely controlled.
Is the 1.5KE51A unidirectional or bidirectional?
The 1.5KE51A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its cathode band marking and specification of forward voltage (VF = 3.5V @ 50A). It protects against reverse-polarity transients only and must be oriented with cathode toward the protected line.
Does the 1.5KE51A meet automotive ESD and surge standards?
Yes, the 1.5KE51A is AEC-Q101 qualified and explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b for electrical fast transient immunity. Its 1500W peak pulse power and <1.0ps response time enable compliance with OEM-level surge requirements for engine control and chassis modules.
What is the maximum clamping voltage of the 1.5KE51A under surge conditions?
The maximum clamping voltage of the 1.5KE51A is 70.1V at 22A peak pulse current (IPP) with a 10/1000μs waveform. This value is measured per JEDEC test conditions and represents the upper limit of voltage seen by downstream components during worst-case transient events.
Can the 1.5KE51A be used in 48V mild-hybrid vehicle systems?
Yes - the 1.5KE51A's 43.6V working stand-off voltage (VWM) provides 10% margin above nominal 48V system voltage during normal operation, while its 70.1V clamping voltage remains compatible with 75V-rated automotive power ICs commonly used in 48V architectures such as DC-DC controllers and gate drivers.
1.5KE51A 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:
- 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):
- 22A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE51A FAQ
1.How can I place an order for 1.5KE51A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51A 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 1.5KE51A reliable?
The price and inventory of 1.5KE51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51A is usually 5 days.
3.What payment methods are accepted for 1.5KE51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51A?
1.5KE51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51A 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 1.5KE51A?
For technical support, including 1.5KE51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51A requirements.
6.How does Aetrix verify that 1.5KE51A is sourced from the original manufacturer or authorized distributors?
All 1.5KE51A 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 1.5KE51A meets industry standards.
7.What is the process for return or replacement of 1.5KE51A?
All 1.5KE51A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51A, 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 1.5KE51A part is unused and in its original packaging.
Return procedure for 1.5KE51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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