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Diodes Incorporated 1.5KE24CA-T
- Part No.:
- 1.5KE24CA-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE24CA-T.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:4,741
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Product details
Overview
1.5KE24CA-T from Diodes Incorporated is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for overvoltage protection of DC power lines and signal interfaces. It features a 20.5V reverse standoff voltage, 22.8V minimum breakdown voltage at 1mA test current, 33.2V maximum clamping voltage at 45A peak pulse current, and operates across –55°C to +175°C.
For engineers reviewing the 1.5KE24CA-T datasheet, 1.5KE24CA-T pinout, 1.5KE24CA-T application, or 1.5KE24CA-T equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current capability under IEC 61000-4-5 surge waveforms, thermal derating above +25°C ambient, and bidirectional polarity suitability for AC-coupled or floating bus protection.
Technical Context
This TVS diode uses glass-passivated silicon junction technology to achieve sub-nanosecond response time and stable clamping performance under repetitive 1.0ms 8/20μs surge transients. Its bidirectional configuration enables symmetrical clamping on both polarities without external polarity management.
The device is rated for 1500W peak pulse power (tP = 1.0ms), with steady-state power dissipation of 5.0W at 75°C lead temperature. Temperature coefficient of VBR is +0.094%/°C, supporting predictable clamping behavior across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms pulse - withstands IEC 61000-4-5 Level 4 surges (4kV/2Ω) |
| Reverse Standoff Voltage (VRWM) | 20.5V - maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage (VBR) | 22.8V min @ 1mA - guaranteed conduction onset under transient stress |
| Clamping Voltage (VC) | 33.2V max @ 45A IPP - limits protected circuit voltage during surge |
| Peak Pulse Current (IPP) | 45A @ 1.0ms - defines maximum surge energy absorption capacity |
| Operating Temperature | –55°C to +175°C - supports under-hood automotive and industrial power supply designs |
Pinout & Package
DO-201 axial-leaded package with tin-finished leads; moisture sensitivity level 1 per J-STD-020. Marking consists of type number only (no cathode band) for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (negative polarity) | Conducts during negative excursions beyond –VRWM; connects to line or signal being protected |
| Cathode | Transient current sink (positive polarity) | Conducts during positive excursions beyond +VRWM; connects to line or signal being protected |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enables stable leakage performance (<5μA @ VR) and long-term reliability under thermal cycling |
| Bidirectional clamping | Provides symmetrical overvoltage protection for AC signals, differential buses, or ungrounded systems |
| RoHS-compliant, halogen-free "Green" finish | Meets automotive and industrial environmental compliance requirements (Br+Cl <1500ppm, Sb <1000ppm) |
| Fast response time | Sub-nanosecond junction turn-on ensures clamping before downstream IC damage thresholds are exceeded |
Applications
| Automotive Power Line Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery rail in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of LDO regulators and microcontrollers. Use Value: Limits transients to ≤33.2V, preserving 3.3V/5V logic supply integrity during 100V/350ms load dump events. |
Use Scenario: 24V digital input modules receiving signals from field sensors in factory automation. IC Role / Device Role / Timing Role: Bidirectional surge shunt on isolated digital inputs subject to ESD and inductive switching noise. Use Value: Clamps ±33.2V surges while maintaining <5μA leakage at 20.5V nominal, ensuring clean logic-level detection. |
| DC Power Supply Input Stage | RS-485 Transceiver Bus Protection |
Use Scenario: Front-end protection of 24V switch-mode power supplies in telecom infrastructure equipment. IC Role / Device Role / Timing Role: First-line transient suppressor across input bulk capacitor terminals. Use Value: Absorbs 1500W surges without degradation, enabling compliance with EN 61000-4-5 Class B immunity testing. |
Use Scenario: Common-mode surge protection on RS-485 differential pairs in building management systems. IC Role / Device Role / Timing Role: Bidirectional clamp between A/B lines and ground to suppress common-mode transients. Use Value: Symmetrical clamping preserves differential signal integrity while limiting common-mode excursion to ≤33.2V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | 600W rating, SMB surface-mount package, 33.2V clamping same | Lower power handling; suited for PCB space-constrained, lower-energy surge environments | Select when board area is limited and peak surge energy is ≤600W (e.g., consumer electronics). |
| 1.5SMC24CA | Same 1500W rating, SMC package, identical electrical specs, higher thermal resistance | Surface-mount alternative with reduced axial-lead assembly compatibility | Choose for automated SMT assembly where DO-201 through-hole insertion is unavailable. |
Compared with SMBJ24CA and 1.5SMC24CA, the 1.5KE24CA-T offers identical clamping performance and surge rating but provides axial-leaded mechanical robustness and superior thermal dissipation via 9.5mm lead length, making it preferred for high-reliability industrial power entry points.
Availability
1.5KE24CA-T is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC I/O protection, and DC power supply input stage applications requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE24CA-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
This part belongs to the 1.5KE series of high-power axial-leaded TVS diodes, engineered specifically for robust overvoltage protection in harsh-environment automotive, industrial, and telecom power systems.
FAQ
What does the "CA" suffix indicate in 1.5KE24CA-T?
The "CA" suffix denotes a bidirectional TVS diode configuration, meaning it provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional "A" variants that require correct polarity orientation, the "CA" version functions identically regardless of installation direction across a protected line or differential pair.
Is 1.5KE24CA-T suitable for IEC 61000-4-5 surge testing?
Yes - its 1500W peak pulse power rating at 1.0ms corresponds directly to the 4kV/2Ω combination wave (1.2/50μs voltage, 8/20μs current) defined in IEC 61000-4-5 Level 4. The 33.2V clamping voltage ensures protected circuits remain within safe operating limits during full-surge events.
How does thermal derating affect power handling above 25°C ambient?
Steady-state power dissipation drops linearly from 5.0W at 75°C lead temperature; no derating curve is specified above 75°C. For pulsed operation, peak power remains 1500W up to TJ = +175°C, but repeated surges require sufficient inter-pulse cooling to avoid cumulative junction heating beyond rated limits.
Can 1.5KE24CA-T replace 1.5KE24A-T in existing designs?
No - the unidirectional 1.5KE24A-T conducts only during positive transients and requires correct anode/cathode orientation. Substituting the bidirectional 1.5KE24CA-T eliminates polarity dependency but may alter leakage behavior in DC-biased circuits; layout review and clamping validation under actual surge conditions are required before replacement.
1.5KE24CA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE24CA-T FAQ
1.How can I place an order for 1.5KE24CA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE24CA-T 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 1.5KE24CA-T reliable?
The price and inventory of 1.5KE24CA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE24CA-T is usually 5 days.
3.What payment methods are accepted for 1.5KE24CA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE24CA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE24CA-T?
1.5KE24CA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE24CA-T 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 1.5KE24CA-T?
For technical support, including 1.5KE24CA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE24CA-T requirements.
6.How does Aetrix verify that 1.5KE24CA-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE24CA-T 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 1.5KE24CA-T meets industry standards.
7.What is the process for return or replacement of 1.5KE24CA-T?
All 1.5KE24CA-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE24CA-T, 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 1.5KE24CA-T part is unused and in its original packaging.
Return procedure for 1.5KE24CA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE24CA-T Tags
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