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Taiwan Semiconductor Corporation 1.5KE51CA
- Part No.:
- 1.5KE51CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51CA.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:2,113
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Product details
Overview
1.5KE51CA from Taiwan Semiconductor is a bidirectional 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 70.1V maximum clamping voltage (VC @ IPP = 22A). It delivers fast response (<5.0ns), low dynamic impedance, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive ECU protection.
For engineers reviewing the 1.5KE51CA datasheet, 1.5KE51CA pinout, 1.5KE51CA application, or 1.5KE51CA equivalent, this device serves as a robust, AEC-Q101-qualified surge protector for bidirectional signal lines, power rails, and interface ports requiring sub-75V clamping and high-reliability transient immunity in harsh environments.
Technical Context
The 1.5KE51CA is a junction-based, silicon avalanche diode designed for unidirectional or bidirectional transient suppression. Its bidirectional operation enables symmetric clamping on AC-coupled or differential lines without polarity constraints, and its 10/1000μs waveform rating ensures validated 1500W surge handling per JEDEC standards.
It operates across –55°C to +175°C junction temperature range, features <1μA leakage at VWM, and exhibits a temperature coefficient of VBR of 0.102%/°C - enabling stable clamping performance under thermal stress in engine bay or industrial control applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 45.9V / 56.1V @ 1mA - defines reliable avalanche onset window for consistent clamping initiation |
| VWM | 41.3V - maximum continuous reverse voltage before significant leakage; sets safe operating margin below VBR |
| VC @ IPP | 70.1V @ 22A - peak clamped voltage during 10/1000μs surge; determines protected circuit's maximum overvoltage exposure |
| PPK | 1500W - peak pulse power rating; supports single-event surges up to 22A without failure |
| Junction Temp | –55°C to +175°C - enables deployment in under-hood automotive, industrial motor drives, and outdoor power systems |
| Response Time | <5.0ns (bidirectional) - ensures clamping activation before transient energy couples into sensitive ICs |
| Leakage Current | <1μA @ VWM - minimizes standby power loss and avoids false triggering in low-power sensor circuits |
Pinout & Package
Package: DO-201 axial leaded case with cathode band marking (bidirectional symmetry means no functional polarity; band denotes mechanical orientation only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry point (bidirectional) | Accepts surge current in either direction; no DC polarity dependency |
| Cathode (Lead 2) | Transient current exit point (bidirectional) | Completes low-impedance path to ground/rail during clamping; marked with band for mechanical alignment |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements (HTOL, TC, HAST, etc.) |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD/coupling noise) |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing |
| UL 94V-0 molding | Flame-retardant encapsulation prevents fire propagation in high-energy fault conditions |
| 100% JESD201 Class 2 whisker tested | Tin-plated leads resist tin whisker growth, ensuring long-term solder joint reliability |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs from load dump and jump-start surges in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential bus lines (CAN_H/CAN_L) or supply rail (VBAT/GND) to clamp transients before they reach PHY ICs. Use Value: Limits voltage excursion to ≤70.1V during 10/1000μs pulses, preventing latch-up or gate oxide damage in 5V/3.3V transceivers while maintaining signal integrity. | Use Scenario: Safeguarding RS-485/CAN nodes in factory automation PLCs exposed to motor drive switching noise and EFT bursts. IC Role / Device Role / Timing Role: Placed between data lines and ground to absorb common-mode transients without disrupting DC bias or signal swing. Use Value: Clamps ±70.1V peaks within 5ns, preserving bit error rate (BER) in 1 Mbps CAN FD networks and meeting IEC 61000-4-4 Level 4 immunity requirements. |
| LED Streetlight Driver Input Stage | Medical Diagnostic Sensor Interface |
Use Scenario: Suppressing lightning-induced surges on AC/DC input stage of outdoor LED drivers subjected to utility grid transients. IC Role / Device Role / Timing Role: Connected line-to-line and line-to-ground to protect bridge rectifier and PFC controller from >1kV ring waves. Use Value: Absorbs 1500W single-event surges without degradation, enabling 10-year field life in IP67-rated luminaires per IEC 61000-4-5. | Use Scenario: Shielding analog front-end (AFE) inputs of portable ultrasound or ECG units from electrostatic discharge during clinical handling. IC Role / Device Role / Timing Role: Mounted directly at connector pins to shunt ESD (IEC 61000-4-2 ±8kV contact) before reaching precision op-amps or ADCs. Use Value: Delivers sub-μA leakage at 41.3V stand-off, avoiding DC offset errors in µV-level biopotential measurements while clamping to 70.1V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ51CA | Same DO-214AC (SMA) package; 51V VBR (45.9–56.1V), 70.1V VC, but rated at 400W (not 1500W); lower surge capacity | Not suitable for 10/1000μs automotive load dump; limited to low-energy ESD/EFT scenarios | Select only when space-constrained layouts require surface-mount and surge demands are ≤400W |
| ON Semiconductor 1.5SMC51CA | DO-214AB (SMC) package; identical 1500W rating, 51V VBR, 70.1V VC, but higher thermal resistance (RθJA = 30°C/W vs. DO-201's ~25°C/W) | Slightly reduced power derating above 75°C ambient; requires larger copper area for same thermal performance | Prefer when existing PCB uses SMC footprint and thermal management allows for marginally lower efficiency |
Compared with SMAJ51CA and 1.5SMC51CA, the 1.5KE51CA offers superior surge endurance in axial-leaded form factor, tighter thermal resistance, and direct AEC-Q101 qualification - making it the optimal choice for high-reliability 1500W transient suppression where through-hole mounting and automotive-grade validation are required.
Availability
1.5KE51CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial communication interfaces, LED driver input protection, and medical sensor front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1.5KE51CA 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 distribution and AEC-Q certified production lines.
The 1.5KE series is engineered specifically for high-energy transient suppression in automotive and industrial environments, emphasizing ruggedness, repeatable clamping, and compliance with ISO 7637-2 and AEC-Q101 for mission-critical electronic control units.
FAQ
What is the clamping voltage of the 1.5KE51CA under a 22A 10/1000μs surge?
The 1.5KE51CA has a maximum clamping voltage (VC) of 70.1V when subjected to a 22A peak pulse current with a 10/1000μs waveform. This value is measured per JEDEC standard test conditions and guarantees that downstream circuitry will not experience voltages exceeding 70.1V during such transient events, protecting 5V or 3.3V logic interfaces and analog front-ends effectively.
Is the 1.5KE51CA suitable for automotive applications?
Yes, the 1.5KE51CA is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 Pulse 1 (load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT/ESD coupling), making it appropriate for engine control units, body control modules, infotainment power supplies, and ADAS sensor interfaces where high-reliability transient suppression is mandatory.
How does the 1.5KE51CA differ from unidirectional variants like 1.5KE51C?
The 1.5KE51CA is bidirectional, meaning it provides symmetrical clamping on both polarities - essential for AC lines, differential buses (e.g., CAN, RS-485), or floating grounds. In contrast, 1.5KE51C is unidirectional and includes a cathode band for polarity-sensitive placement; it cannot suppress positive transients on its anode side. The "CA" suffix confirms bidirectional functionality per TSC's ordering nomenclature.
What is the maximum operating temperature for the 1.5KE51CA?
The 1.5KE51CA has a maximum junction temperature (TJ) of +175°C and a storage temperature range of –55°C to +175°C. This wide thermal envelope supports deployment in under-hood automotive locations, industrial motor drives, and outdoor power conversion systems where ambient temperatures exceed 125°C, provided PCB thermal design maintains junction temperature within limit.
Does the 1.5KE51CA require a heatsink for 1500W surge handling?
No - the 1500W peak power rating of the 1.5KE51CA applies to non-repetitive 10/1000μs pulses at TA = 25°C and does not require external heatsinking. However, for repetitive surges or elevated ambient temperatures, derating per Figure 2 in the datasheet is mandatory; sustained power dissipation is limited to 5W at TL = 75°C with specified 0.6″ × 0.6″ copper pad area.
1.5KE51CA 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):
- 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
1.5KE51CA FAQ
1.How can I place an order for 1.5KE51CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51CA 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 1.5KE51CA reliable?
The price and inventory of 1.5KE51CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51CA is usually 5 days.
3.What payment methods are accepted for 1.5KE51CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51CA?
1.5KE51CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51CA 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 1.5KE51CA?
For technical support, including 1.5KE51CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51CA requirements.
6.How does Aetrix verify that 1.5KE51CA is sourced from the original manufacturer or authorized distributors?
All 1.5KE51CA 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 1.5KE51CA meets industry standards.
7.What is the process for return or replacement of 1.5KE51CA?
All 1.5KE51CA units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51CA, 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 1.5KE51CA part is unused and in its original packaging.
Return procedure for 1.5KE51CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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