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Taiwan Semiconductor Corporation 1.5KE47
- Part No.:
- 1.5KE47
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE47.pdf
- Description:
- 1500W, 47V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,203
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Product details
Overview
1.5KE47 from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a nominal breakdown voltage of 47 V, clamping voltage of 67.8 V at 23 A peak impulse current, working stand-off voltage of 38.1 V, and operates within -55°C to +175°C junction temperature range - deployed in automotive power supply inputs and industrial PLC I/O modules.
For engineers reviewing the 1.5KE47 datasheet, 1.5KE47 pinout, 1.5KE47 application, or 1.5KE47 equivalent, key selection criteria include its DO-201 package compatibility, 10/1000 μs surge rating, low dynamic impedance, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The 1.5KE47 employs an avalanche breakdown mechanism to clamp transient overvoltages above its 42.3–51.7 V breakdown range (tested at 1.0 mA), limiting downstream voltage to ≤67.8 V during 1500 W, 10/1000 μs surges. Its unidirectional structure provides forward conduction only, with VF = 3.5 V at 50 A for VBR ≤ 200 V devices.
Thermal performance is defined by a 175°C maximum junction temperature and derated peak power dissipation above 25°C ambient per Fig.2; steady-state power handling is 5 W when mounted on a 16 mm × 16 mm copper pad at TL = 75°C. Polarity is marked by a cathode band on the DO-201 case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 42.3–51.7 V - defines minimum and maximum voltage at which avalanche conduction begins; sets clamping threshold window |
| VWM | 38.1 V - maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VC @ IPP = 23 A | 67.8 V - peak clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure |
| PPK | 1500 W - non-repetitive peak pulse power capability at TA = 25°C; defines single-event surge energy handling |
| IPP | 23 A - peak impulse current corresponding to VC = 67.8 V; used to size upstream fusing and trace routing |
| TJ max | +175°C - maximum allowable junction temperature; enables operation in under-hood automotive environments |
| ID @ VWM | <1 μA - blocking leakage current at rated stand-off voltage; ensures minimal standby power loss |
Pinout & Package
Package: DO-201 - axial-leaded, molded plastic case with pure tin-plated leads solderable per J-STD-002; cathode identified by a single band; weight ≈ 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes conduction loop during transient clamping |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); polarity band must align with schematic symbol |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche clamping response time | <1.0 ps - enables sub-nanosecond suppression onset, critical for protecting fast logic and microcontrollers |
| ISO 7637-2 compliance | Pulse 1/2a/2b/3a/3b - validated for automotive load dump and inductive switching transients per OEM requirements |
| Dynamic impedance | Low - minimizes voltage overshoot during high-di/dt events; improves clamping precision vs. Zener-based alternatives |
| AEC-Q101 qualification option | Available as 1.5KE47H - supports automotive-grade reliability screening including temperature cycling and HTRB |
| RoHS & halogen-free | Compliant per IEC 61249-2-21 - meets environmental regulations for industrial and consumer end equipment |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12 V battery feed to body control module exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary TVS clamp on main power rail; absorbs >1500 W surges before downstream LDOs or MCUs see overvoltage. Use Value: Limits rail voltage to ≤67.8 V during 10/1000 μs transients, preventing latch-up or gate oxide damage in 3.3 V/5 V logic supplies. |
Use Scenario: 24 V digital input channel in programmable logic controller subjected to ESD and field-wiring inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between terminal block and optocoupler input; shunts transients before isolation barrier. Use Value: Clamps fast-rising spikes (<1 ns rise) to safe levels while maintaining <1 μA leakage at 24 V nominal, preserving input threshold accuracy. |
| LED Driver Supply Rail Protection | Telecom DC Power Interface |
Use Scenario: Constant-current LED driver powered from 48 V telecom supply experiencing hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Standoff protector on input capacitor node; prevents overvoltage stress on MOSFET gate drivers and current sense amplifiers. Use Value: Withstands 1500 W surges without degradation, ensuring long-term reliability in outdoor lighting systems operating up to 85°C ambient. |
Use Scenario: -48 V DC power interface in base station equipment exposed to lightning-induced surges on long feeder lines. IC Role / Device Role / Timing Role: First-stage unidirectional clamp on rectified supply; coordinates with secondary MOV/GDT stages for staged protection. Use Value: Provides precise 38.1 V stand-off and 67.8 V clamping, enabling tighter design margins than generic 40 V Zeners with higher dynamic impedance. |
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 SMAJ47A | Same DO-214AC (SMA) package; 47 V nominal, VC = 76.0 V @ 19.3 A; lower PPK (400 W) | Lower surge rating suits cost-sensitive consumer electronics; not suitable for ISO 7637-2 Pulse 5a automotive load dump | Select when board space is constrained and surge energy is ≤400 W; verify layout thermal relief for SMA footprint |
| ON Semiconductor 1.5SMC47A | DO-214AB (SMC) package; 47 V nominal, VC = 76.0 V @ 19.3 A; PPK = 1500 W; AEC-Q101 qualified | Same power rating but larger SMC footprint; better thermal mass for sustained surge duty cycles | Choose for automotive applications requiring AEC-Q101 and higher thermal robustness; requires PCB pad revision from DO-201 |
Compared with 1.5KE47, SMAJ47A offers smaller size but reduced surge capacity, while 1.5SMC47A matches 1500 W rating and adds AEC-Q101 qualification at the cost of larger DO-214AB packaging - making 1.5KE47 optimal for legacy DO-201 designs needing proven automotive-grade surge immunity without footprint change.
Availability
1.5KE47 is available at Aetrix Electronics and suitable for automotive power inputs, industrial PLC I/O protection, LED driver supply rails, and telecom DC interfaces requiring stable component supply across extended temperature ranges and high-energy transient immunity.
Supply support for 1.5KE47 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-Q101 qualification capabilities.
The 1.5KE series was engineered for high-energy transient suppression in automotive and industrial environments, emphasizing robust DO-201 packaging, low clamping ratio, and compliance with ISO 7637-2 and RoHS standards.
FAQ
What is the breakdown voltage range of the 1.5KE47?
The 1.5KE47 has a specified breakdown voltage (VBR) range of 42.3 V to 51.7 V at a test current (IT) of 1.0 mA. This range reflects manufacturing tolerance and ensures reliable avalanche initiation across all units. The 1.5KE47 must be biased below its 38.1 V working stand-off voltage (VWM) in normal operation to avoid leakage-related power loss or thermal stress.
Is the 1.5KE47 unidirectional or bidirectional?
The 1.5KE47 is a unidirectional TVS diode, meaning it conducts only in reverse bias during overvoltage events and blocks forward current like a standard rectifier. Its cathode is marked by a band on the DO-201 package. Bidirectional variants (e.g., 1.5KE47CA) exist but are distinct part numbers - the 1.5KE47 itself is strictly unidirectional.
What is the clamping voltage of the 1.5KE47 under surge conditions?
The 1.5KE47 clamps to a maximum of 67.8 V when subjected to a 10/1000 μs surge waveform with a peak current (IPP) of 23 A. This clamping voltage is measured at the device terminals and represents the highest voltage seen by downstream circuitry during worst-case transient events - a critical parameter for ensuring IC-level overvoltage immunity.
Does the 1.5KE47 meet automotive qualification standards?
The base 1.5KE47 is not AEC-Q101 qualified; however, the variant 1.5KE47H (with "H" suffix) is explicitly qualified to AEC-Q101. Both share identical electrical specs and DO-201 packaging, but only 1.5KE47H undergoes stress testing for temperature cycling, highly accelerated life testing (HALT), and other automotive reliability requirements.
What package type does the 1.5KE47 use, and how is polarity indicated?
The 1.5KE47 uses the DO-201 axial-leaded package with pure tin-plated leads. Polarity is indicated by a single cathode band near one end of the molded case - this band must align with the cathode symbol in the schematic and PCB silkscreen. Correct orientation ensures proper clamping behavior during reverse-biased transients.
1.5KE47 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):
- 38.1V
- Voltage - Breakdown (Min):
- 42.3V
- Voltage - Clamping (Max) @ Ipp:
- 67.8V
- Current - Peak Pulse (10/1000µs):
- 23A
- 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
1.5KE47 FAQ
1.How can I place an order for 1.5KE47 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE47 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 1.5KE47 reliable?
The price and inventory of 1.5KE47 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE47 is usually 5 days.
3.What payment methods are accepted for 1.5KE47?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE47 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE47?
1.5KE47 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE47 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 1.5KE47?
For technical support, including 1.5KE47 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE47 requirements.
6.How does Aetrix verify that 1.5KE47 is sourced from the original manufacturer or authorized distributors?
All 1.5KE47 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 1.5KE47 meets industry standards.
7.What is the process for return or replacement of 1.5KE47?
All 1.5KE47 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE47, 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 1.5KE47 part is unused and in its original packaging.
Return procedure for 1.5KE47:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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