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STMicroelectronics 1.5KE24CA
- Part No.:
- 1.5KE24CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-201AE, Axial
- Datasheet:
-
1.5KE24CA.pdf
- Description:
- TVS D5.4X7.5 20.5V 1500W BIDIR
- Quantity:
- Payment:
- Shipping:
Inventory:3,048
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Product details
Overview
1.5KE24CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in DO-201 package, designed for high-energy surge protection with 24 V standoff voltage (VRWM), 33.2 V clamping voltage (VCL) at 45 A peak pulse current, and 1500 W peak pulse power (10/1000 µs). It operates from –55 °C to +175 °C and is used in industrial power supplies and telecom interfaces to suppress ESD and lightning-induced transients.
For engineers reviewing the 1.5KE24CA datasheet, 1.5KE24CA pinout, 1.5KE24CA application, or 1.5KE24CA equivalent, key selection criteria include bidirectional clamping behavior, junction temperature derating above 25 °C, IEC 61000-4-2/4-4 compliance, and DO-201 mechanical compatibility with through-hole PCB layouts.
Technical Context
The 1.5KE24CA employs planar junction technology to achieve low leakage (<1 µA at 19.4 V), stable VBR drift coefficient (αT = 9.4 × 10–4/°C), and robust thermal performance up to Tj = 175 °C. Its bidirectional structure enables symmetric clamping for AC-coupled lines without polarity constraints.
It delivers 33.2 V clamping at 45 A (10/1000 µs) and 42.8 V at 234 A (8/20 µs), with dynamic resistance (RD) of 0.178 Ω - enabling precise overvoltage limiting in fast-rising surges while maintaining low forward voltage drop under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 24 V - maximum continuous reverse working voltage before breakdown; defines operating margin for 24 V DC systems. |
| Breakdown Voltage (VBR) | 20.5–25.2 V at 1 mA - tight tolerance ensures predictable turn-on across temperature and production lots. |
| Clamping Voltage (VCL) | 33.2 V at 45 A (10/1000 µs) - limits downstream IC voltage stress during surge events. |
| Peak Pulse Power | 1500 W (10/1000 µs) - sustains short-duration energy bursts common in industrial EFT and lightning coupling. |
| Junction Temperature Range | –55 °C to +175 °C - supports operation in harsh environments including motor drives and outdoor telecom cabinets. |
| ESD Withstand | ±30 kV contact/air discharge (IEC 61000-4-2) - exceeds Level 4, eliminating need for upstream ESD filters in many designs. |
Pinout & Package
1.5KE24CA is housed in a DO-201 axial leaded package (8.5–9.5 mm length, 4.8–5.3 mm diameter, 0.96–1.06 mm lead diameter), with cathode marked by band on one end. Bidirectional symmetry means both leads are functionally identical - no anode/cathode orientation required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Surge current path | Both terminals conduct equally during positive/negative transients; no polarity dependency in AC or floating applications. |
| Lead 1 / Lead 2 | Thermal and electrical interface | Leads serve as primary heat dissipation paths; soldering to ≥25 mm² copper improves power handling beyond 1500 W at elevated Tj. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signal lines, differential buses, or ungrounded power rails without polarity concerns. |
| 175 °C max junction temperature | Allows direct placement near hot components (e.g., MOSFET heatsinks) without thermal derating penalties in compact enclosures. |
| Low dynamic resistance (0.178 Ω) | Minimizes voltage overshoot during fast 8/20 µs surges, improving protection margin for 3.3 V or 5 V logic interfaces. |
| UL 497B certified (QVGQ2.E136224) | Validates suitability for telecom line interface protection per UL safety standards without additional system-level certification effort. |
Applications
| Industrial Power Input Protection | Telecom Line Interface |
|---|---|
Use Scenario: 24 V DC input stage of PLC I/O module exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly across input terminals ahead of DC-DC converter. Use Value: Limits transient voltage to ≤33.2 V, preventing damage to upstream rectifier and downstream regulator ICs rated for 36 V absolute max. | Use Scenario: RS-485 transceiver bus lines in outdoor base station equipment subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential pair (A/B), referenced to local ground. Use Value: Clamps ±42.8 V surges (8/20 µs) within 1 ns response time, preserving signal integrity and avoiding transceiver latch-up. |
| AC-DC Adapter Surge Suppression | Automotive Body Control Module |
Use Scenario: Secondary-side output of 24 V wall adapter subjected to EFT noise from nearby switching loads. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS across output terminals to suppress repetitive 5 kHz burst noise. Use Value: Maintains <1 µA standby current while clamping 1500 W pulses, avoiding efficiency loss or thermal drift in sealed adapters. | Use Scenario: LIN bus node in door module exposed to battery disconnect transients and ESD from user contact. IC Role / Device Role / Timing Role: Bidirectional protection on LIN signal line, mounted close to connector for shortest path to ground. Use Value: Withstands ±30 kV ESD (IEC 61000-4-2) and clamps 100 V load dump spikes to <45 V, ensuring microcontroller reset immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA (STMicroelectronics) | Same VRWM (24 V) and VCL (38.9 V @ 38.8 A), but 600 W rating and SMB package (surface-mount). | Requires PCB rework for SMT assembly; lower power handling limits use in high-energy industrial surges. | Select when board space is constrained and surge energy remains below 600 W (10/1000 µs). |
| P6KE24CA (ON Semiconductor) | Identical DO-201 package and 24 V VRWM, but higher VCL (36.0 V @ 42 A) and 1500 W rating; αT = 9.2 × 10–4/°C. | Marginally higher clamping increases risk of downstream IC overvoltage in 3.3 V logic interfaces. | Acceptable for 24 V analog sensor inputs where 36 V clamping is within safe operating area. |
Compared with SMBJ24CA and P6KE24CA, the 1.5KE24CA offers the lowest clamping voltage (33.2 V) among DO-201 24 V bidirectional TVS diodes, making it optimal for protecting voltage-sensitive 24 V systems where headroom below 36 V is critical.
Availability
1.5KE24CA is available at Aetrix Electronics and suitable for industrial power input protection, telecom line interface, AC-DC adapter surge suppression, and automotive body control module applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1.5KE24CA 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.
The 1.5KE series belongs to ST's high-power TVS portfolio, engineered specifically for robust front-end surge protection in industrial automation, telecom infrastructure, and transportation systems where reliability under extreme thermal and electrical stress is mandatory.
FAQ
What is the maximum clamping voltage for 1.5KE24CA under a 10/1000 µs surge?
The maximum clamping voltage is 33.2 V at 45 A peak pulse current for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature using αT = 9.4 × 10–4/°C, reaching ~35.1 V at Tj = 125 °C.
Can 1.5KE24CA be used in AC line applications?
Yes - its bidirectional construction allows direct use across AC mains inputs up to 24 V RMS, provided peak voltage (e.g., 34 V for 24 V RMS) remains below VBR min (20.5 V). For higher AC voltages, select a higher VRWM variant like 1.5KE33CA or 1.5KE36CA.
How does the DO-201 package affect thermal performance?
The DO-201 axial package relies on lead conduction for heat dissipation. With 25 mm² copper pads per lead, thermal resistance drops to ~40 °C/W, enabling sustained 1500 W pulse handling. Without adequate copper, derating to ≤800 W is required above 75 °C ambient.
Is 1.5KE24CA compliant with RoHS and REACH?
Yes - it carries STMicroelectronics' ECOPACK2 designation, confirming full compliance with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, including exemption 7a for lead in high-melting-temperature solder alloys used in DO-201 lead finishing.
1.5KE24CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-201AE, Axial
- Series:
- 1.5KE
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1750pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE24CA FAQ
1.How can I place an order for 1.5KE24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE24CA 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 reliable?
The price and inventory of 1.5KE24CA 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 is usually 5 days.
3.What payment methods are accepted for 1.5KE24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE24CA?
1.5KE24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE24CA 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?
For technical support, including 1.5KE24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE24CA requirements.
6.How does Aetrix verify that 1.5KE24CA is sourced from the original manufacturer or authorized distributors?
All 1.5KE24CA 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 meets industry standards.
7.What is the process for return or replacement of 1.5KE24CA?
All 1.5KE24CA units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE24CA, 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 part is unused and in its original packaging.
Return procedure for 1.5KE24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE24CA Tags
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