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Taiwan Semiconductor Corporation 1.5KE43
- Part No.:
- 1.5KE43
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43.pdf
- Description:
- 1500W, 43V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,456
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Product details
Overview
1.5KE43 from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a nominal breakdown voltage of 43V, clamping voltage of 61.9V at 25A peak pulse current, working stand-off voltage of 34.8V, and DO-201 axial package with <1μA leakage above 10V.
For engineers reviewing the 1.5KE43 datasheet, 1.5KE43 pinout, 1.5KE43 application, or 1.5KE43 equivalent, key selection criteria include its 10/1000μs waveform surge rating, low dynamic impedance, fast response time (<1.0ps), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and suitability for automotive ESD and inductive switching load protection.
Technical Context
The 1.5KE43 operates as a unidirectional avalanche diode with precise VBR = 38.7–47.3V at 1.0mA test current, enabling reliable overvoltage clamping before downstream IC damage occurs. Its 61.9V maximum clamping voltage at 25A IPP ensures robust protection margin for 36V nominal systems.
Thermal design is constrained by a 175°C maximum junction temperature and 5W steady-state power dissipation at 75°C lead temperature on 16mm×16mm copper pad. The device exhibits a +0.101%/°C VBR temperature coefficient and meets JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 38.7–47.3V - Ensures consistent avalanche initiation across temperature and unit variation |
| VWM | 34.8V - Maximum continuous reverse operating voltage without significant leakage |
| VC @ IPP=25A | 61.9V - Clamped voltage during 10/1000μs surge, defining protected circuit voltage ceiling |
| PPK | 1500W - Peak pulse power handling capability per JEDEC standard waveform |
| IPP max | 25A - Maximum non-repetitive peak surge current the device can safely divert |
| Junction temp. range | −55°C to +175°C - Enables operation in under-hood automotive and industrial environments |
| Leakage @ VWM | <1μA - Minimizes standby power loss and avoids false triggering in low-power circuits |
Pinout & Package
Package: DO-201 axial leaded package with cathode band marking; 0.090g mass; UL 94V-0 molding compound; pure tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; defines unidirectional conduction path |
| Cathode | High-side surge input terminal | Connected to protected line; avalanche breakdown occurs when cathode-to-anode voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option | 1.5KE43H variant available for automotive-grade reliability and qualification traceability |
| Fast response time | <1.0ps rise time from 0V to VBR, enabling protection of nanosecond-scale transients |
| ISO 7637-2 compliance | Fully rated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance stabilization network) |
| Low dynamic impedance | Ensures minimal voltage overshoot during surge events, preserving clamping accuracy |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 24V/36V battery-fed ECUs from load dump and alternator transients per ISO 7637-2 Pulse 5a/5b. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach PMICs or microcontrollers. Use Value: Withstands 1500W 10/1000μs pulses and clamps to 61.9V, maintaining safe operating voltage for 36V-rated downstream components. |
Use Scenario: Shielding digital input channels of programmable logic controllers from field-induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff protection element on 24V sensor interface lines, absorbing fast EFT bursts per IEC 61000-4-4. Use Value: Sub-1.0ps response and 34.8V VWM prevent false triggering while ensuring sub-62V clamping during 4kV EFT events. |
| LED Driver Overvoltage Protection | Telecom DC Power Feeds |
Use Scenario: Safeguarding constant-current LED drivers against inductive kickback from magnetic ballasts or long cable runs. IC Role / Device Role / Timing Role: Parallel-connected TVS on driver output to shunt transient energy away from sensitive current-sense amplifiers and MOSFET gates. Use Value: 25A IPP rating and 61.9V VC limit ensure LED string remains within safe forward-voltage window during 100ns–1ms spikes. |
Use Scenario: Protecting -48V telecom power distribution boards from lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Primary-level clamping device on DC input stage, coordinated with upstream gas discharge tubes and series impedance. Use Value: 1500W surge capacity and 175°C TJMAX support sustained operation in hot, unventilated central office cabinets. |
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 SMAJ43A | Same 43V nominal, DO-214AC (SMA) package, 400W PPK, lower IPP (12.3A), higher VC (69.4V) | Lower surge rating limits use to lighter-duty industrial or consumer applications | Select when board space constraints favor surface-mount and surge energy is ≤400W |
| ON Semiconductor 1.5SMC43A | Same 43V nominal, DO-214AB (SMC) package, 1500W PPK, identical VC (61.9V), but 175°C TJMAX and AEC-Q101 option not documented | Lacks formal automotive qualification evidence despite matching electrical specs | Select for cost-sensitive industrial designs where AEC-Q101 traceability is not required |
Compared with 1.5KE43, SMAJ43A offers smaller footprint but sacrifices 60% surge energy handling and clamping performance; 1.5SMC43A matches power rating and clamping but lacks verified AEC-Q101 status, making 1.5KE43 the preferred choice for automotive-critical 36V rail protection where qualification and thermal margin are mandatory.
Availability
1.5KE43 is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial PLC input conditioning, and LED driver overvoltage safeguarding requiring stable component supply across multi-year production cycles.
Supply support for 1.5KE43 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 capability.
The 1.5KE series was engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing robust surge handling, thermal stability, and standardized mechanical compatibility with legacy DO-201 footprints.
FAQ
What is the polarity configuration of the 1.5KE43?
The 1.5KE43 is a unidirectional TVS diode with cathode band marking indicating the high-side terminal. It conducts only during reverse-biased overvoltage events - forward conduction is not intended for surge suppression. This configuration makes it suitable for DC power rail protection where polarity is fixed and ground-referenced clamping is required.
Does the 1.5KE43 meet automotive qualification standards?
Yes - the 1.5KE43H variant is explicitly AEC-Q101 qualified per the manufacturer's ordering information. Standard 1.5KE43 units share identical electrical and thermal specifications but lack formal qualification documentation; for automotive production, specify 1.5KE43H to ensure compliance with stress-test requirements including temperature cycling, humidity bias, and mechanical shock.
What is the maximum clamping voltage of the 1.5KE43 under surge conditions?
The 1.5KE43 has a maximum clamping voltage (VC) of 61.9V at 25A peak pulse current (IPP) using the standard 10/1000μs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
How does the 1.5KE43 compare to the 1.5KE43A variant?
The 1.5KE43A offers tighter VBR tolerance (40.9–45.2V vs. 38.7–47.3V for 1.5KE43) and slightly higher VWM (36.8V vs. 34.8V), resulting in improved noise immunity and reduced leakage at operating voltage. Both share identical PPK, VC, and package; select 1.5KE43A when tighter voltage control is critical for precision rail monitoring.
Can the 1.5KE43 be used in bidirectional configurations?
No - the 1.5KE43 is strictly unidirectional. For bidirectional protection, Taiwan Semiconductor specifies CA-suffixed parts (e.g., 1.5KE43CA) which internally integrate two opposing diodes. Using a unidirectional device like 1.5KE43 in AC or floating applications risks failure during negative excursions, as it lacks reverse avalanche capability.
1.5KE43 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):
- 34.8V
- Voltage - Breakdown (Min):
- 38.7V
- Voltage - Clamping (Max) @ Ipp:
- 61.9V
- Current - Peak Pulse (10/1000µs):
- 25A
- 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
1.5KE43 FAQ
1.How can I place an order for 1.5KE43 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43 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 1.5KE43 reliable?
The price and inventory of 1.5KE43 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE43 is usually 5 days.
3.What payment methods are accepted for 1.5KE43?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43?
1.5KE43 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43 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 1.5KE43?
For technical support, including 1.5KE43 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43 requirements.
6.How does Aetrix verify that 1.5KE43 is sourced from the original manufacturer or authorized distributors?
All 1.5KE43 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 1.5KE43 meets industry standards.
7.What is the process for return or replacement of 1.5KE43?
All 1.5KE43 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43, 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 1.5KE43 part is unused and in its original packaging.
Return procedure for 1.5KE43:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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