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Taiwan Semiconductor Corporation 1.5KE24
- Part No.:
- 1.5KE24
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE24.pdf
- Description:
- 1500W, 24V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,232
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Product details
Overview
1.5KE24 from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a nominal breakdown voltage of 24V, minimum/maximum VBR of 21.6V/26.4V at 1mA test current, working stand-off voltage of 19.4V, clamping voltage of 34.7V at 45A peak pulse current, and operates across –55°C to +175°C junction temperature range - deployed in automotive power supply rail protection.
For engineers reviewing the 1.5KE24 datasheet, 1.5KE24 pinout, 1.5KE24 application, or 1.5KE24 equivalent, key selection criteria include clamping performance under 10/1000μs surge, unidirectional polarity marking, DO-201 package thermal derating behavior, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive ECU front-end protection.
Technical Context
The 1.5KE24 functions as a unidirectional avalanche diode that enters breakdown when transient voltage exceeds its VBR threshold, diverting surge current away from downstream circuitry. Its low dynamic impedance ensures rapid voltage clamping, while sub-1ps response time (0V to VBR) enables protection against fast-rising ESD and EFT events.
It is rated for 1500W non-repetitive peak pulse power at TA = 25°C, with thermal derating above ambient temperature per Fig.2. The device supports up to 200A IFSM forward surge current (8.3ms half-sine) and exhibits ≤1μA blocking leakage at 10V above VWM, confirming suitability for low-power standby circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1mA | 21.6V min / 26.4V max - defines precise avalanche initiation window for reliable overvoltage triggering |
| VWM | 19.4V - maximum continuous DC or RMS voltage the device blocks without conduction |
| VC @ IPP = 45A | 34.7V - clamped voltage seen by protected IC during full-rated 10/1000μs surge |
| PPK | 1500W - peak single-pulse energy handling capacity under standardized waveform |
| Junction Temp Range | –55°C to +175°C - enables deployment in under-hood automotive environments and industrial power supplies |
| Package | DO-201 - axial-leaded, through-hole package with UL 94V-0 molding and tin-plated leads per J-STD-002 |
| Leakage @ VWM | <1μA - ensures minimal standby power loss in always-on systems |
Pinout & Package
1.5KE24 uses the DO-201 axial package with two terminals: anode and cathode. Polarity is marked by a band on the cathode end. Leads are pure tin-plated and solderable per J-STD-002; weight is approximately 0.090g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to ground or lower-potential node in unidirectional TVS configuration |
| Cathode (banded end) | Current exit point in forward bias; avalanche conduction terminal in reverse bias | Connected to protected line (e.g., 24V rail); absorbs surge energy when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 1500W surge rating (10/1000μs) | Enables robust protection against load dump and inductive switching transients in 24V automotive systems |
| Clamping voltage 34.7V @ 45A | Keeps protected ICs within safe operating area during worst-case ISO 7637-2 Pulse 5a events |
| Response time <1.0ps (0V to VBR) | Provides effective suppression of nanosecond-scale ESD and fast EFT bursts before damage occurs |
| AEC-Q101 qualified option (1.5KE24H) | Validates reliability for automotive electronics requiring qualification per stress-test standard |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for industrial and automotive manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting microcontroller power inputs in engine control units exposed to ISO 7637-2 load dump pulses up to 60V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V supply and GND, clamping surges before they reach LDO regulators and MCU VCC. Use Value: Limits voltage to 34.7V during 45A transient, preventing latch-up or gate oxide damage in 3.3V/5V logic rails. | Use Scenario: Safeguarding 24V digital input channels in programmable logic controllers subject to field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end TVS on each optocoupler input line, absorbing inductive kickback from solenoid actuation. Use Value: Withstands repeated 10/1000μs surges up to 1500W without degradation, extending system MTBF in factory automation. |
| LED Driver Overvoltage Clamp | Telecom DC Power Interface |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to accidental 48V supply misconnection. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to driver ground, activated only when input exceeds 24V nominal. Use Value: Clamps fault condition at 34.7V, allowing upstream fuse to clear while preserving driver IC integrity. | Use Scenario: Protecting PoE-powered endpoint equipment from DC overvoltage on 48V input lines during hot-swap or adapter faults. IC Role / Device Role / Timing Role: Primary surge shunt on main DC input, coordinated with secondary TVS and OVP IC for layered defense. Use Value: Low leakage (<1μA) avoids loading 48V standby rails; DO-201 package allows manual rework in field-serviceable telecom modules. |
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 SMAJ24A | Same DO-214AC (SMA) package; 24V nominal, VC = 38.9V @ 38.8A; 400W rating | Lower power rating limits use to sub-400W surge environments; surface-mount only | Select when board space is constrained and surge energy is ≤400W; not drop-in for through-hole 1.5KE24 |
| ON Semiconductor 1N6280A | Identical electrical specs (24V, VBR 22.8–25.2V, VC 33.2V @ 47A), same DO-201 package, JEDEC 1N6280A designation | No functional difference; direct second-source part with identical pinout and footprint | Preferred for dual-sourcing in automotive Tier-1 BOMs where multi-vendor qualification is required |
Compared with 1.5KE24, SMAJ24A offers surface-mount compatibility but sacrifices 60% peak power handling; 1N6280A provides identical performance and form factor as a fully validated second source, enabling supply chain resilience without design change.
Availability
1.5KE24 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, LED lighting drivers, and telecom power interfaces requiring stable component supply across extended temperature ranges and high-reliability surge environments.
Supply support for 1.5KE24 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 MOSFETs for automotive, industrial, and consumer markets.
The 1.5KE series was developed specifically for high-energy transient suppression in 12V/24V/48V automotive and industrial power systems, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust DO-201 packaging.
FAQ
What is the maximum clamping voltage of the 1.5KE24 under full-rated surge conditions?
The 1.5KE24 has a maximum clamping voltage (VC) of 34.7V when subjected to its rated peak pulse current of 45A under the 10/1000μs waveform. This value is measured per JEDEC standards and guarantees the protected circuit sees no more than 34.7V during worst-case transient events, making it suitable for safeguarding 3.3V, 5V, and 12V logic interfaces fed from a 24V rail. The 1.5KE24 maintains this clamping performance across its specified junction temperature range.
Is the 1.5KE24 unidirectional or bidirectional, and how is polarity identified?
The 1.5KE24 is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Polarity is identified by a cathode band marked on the DO-201 package body - the banded end connects to the protected line (e.g., 24V supply), while the unbanded end connects to ground. Bidirectional variants (e.g., 1.5KE24CA) exist but are distinct part numbers; the 1.5KE24 itself conducts only in reverse breakdown and blocks forward voltage up to 3.5V.
Does the 1.5KE24 meet automotive qualification standards?
The base 1.5KE24 is not AEC-Q101 qualified; however, the variant 1.5KE24H (with "H" suffix) is explicitly qualified per AEC-Q101 for stress testing including HTSL, TC, AC, and mechanical shock. This makes 1.5KE24H suitable for automotive powertrain and chassis modules, while the standard 1.5KE24 remains appropriate for industrial and commercial applications meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b. Always verify the suffix when selecting for automotive use.
What is the thermal derating behavior of the 1.5KE24 above 25°C ambient?
The 1.5KE24's peak pulse power rating of 1500W applies only at TA = 25°C. Above this temperature, power capability decreases linearly per the Pulse Derating Curve (Fig.2): at 75°C ambient, it delivers ~750W; at 125°C, ~375W; and at 150°C, ~180W. Derating assumes no heatsink; mounting on a 16mm × 16mm copper pad improves thermal performance. The 1.5KE24's 175°C maximum junction temperature allows operation in high-ambient environments when properly derated.
How does the 1.5KE24 compare to the 1.5KE24A variant?
The 1.5KE24A differs from the 1.5KE24 in tighter VBR tolerance: 22.8V–25.2V (vs. 21.6V–26.4V) and higher VWM of 20.5V (vs. 19.4V), resulting in lower leakage and improved noise immunity. Its clamping voltage is 33.2V @ 47A - slightly lower and at higher current, indicating better surge handling margin. Both share DO-201 packaging and temperature ratings; the 1.5KE24A is preferred where tighter voltage control and enhanced clamping are critical, such as in precision sensor power domains.
1.5KE24 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):
- 19.4V
- Voltage - Breakdown (Min):
- 21.6V
- Voltage - Clamping (Max) @ Ipp:
- 34.7V
- Current - Peak Pulse (10/1000µs):
- 45A
- 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
1.5KE24 FAQ
1.How can I place an order for 1.5KE24 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE24 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 1.5KE24 reliable?
The price and inventory of 1.5KE24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE24 is usually 5 days.
3.What payment methods are accepted for 1.5KE24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE24?
1.5KE24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE24 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 1.5KE24?
For technical support, including 1.5KE24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE24 requirements.
6.How does Aetrix verify that 1.5KE24 is sourced from the original manufacturer or authorized distributors?
All 1.5KE24 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 1.5KE24 meets industry standards.
7.What is the process for return or replacement of 1.5KE24?
All 1.5KE24 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE24, 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 1.5KE24 part is unused and in its original packaging.
Return procedure for 1.5KE24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE24 Tags
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