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Diodes Incorporated 1.5KE18CA-T
- Part No.:
- 1.5KE18CA-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE18CA-T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:760
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Product details
Overview
1.5KE18CA-T from Diodes Incorporated is a bidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for high-energy surge protection in DC power rails and signal lines. It features a 15.3V reverse standoff voltage, 17.1V minimum breakdown voltage at 1mA test current, 25.2V maximum clamping voltage at 59.5A peak pulse current, and operates across -55°C to +175°C.
For engineers reviewing the 1.5KE18CA-T datasheet, 1.5KE18CA-T pinout, 1.5KE18CA-T application, or 1.5KE18CA-T equivalent, this TVS diode is selected for robust overvoltage protection in automotive power supplies, industrial I/O interfaces, and telecom line cards where fast response (<1ns), low clamping ratio (1.48), and AEC-Q200-compatible construction are critical.
Technical Context
This bidirectional TVS diode uses glass-passivated silicon junctions to achieve sub-nanosecond response time and stable clamping under repetitive 1.0ms 8/20μs surge waveforms. Its symmetrical avalanche structure enables identical clamping in both polarities, eliminating polarity dependency in AC-coupled or floating circuits.
The device sustains 5.0W steady-state power at 75°C lead temperature and handles 200A non-repetitive forward surge current, making it suitable for protecting downstream rectifiers, regulators, and controllers against lightning-induced transients and inductive switching spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms pulse - withstands high-energy surges per IEC 61000-4-5 Level 4 (4kV) |
| Reverse Standoff Voltage | 15.3V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 17.1V min @ 1mA - guaranteed avalanche conduction onset under transient stress |
| Clamping Voltage | 25.2V max @ 59.5A - limits protected circuit voltage during worst-case surge event |
| Peak Pulse Current | 59.5A @ 1.0ms - quantifies surge-handling capacity for coordination with upstream fuses |
| Operating Temperature | -55°C to +175°C - supports under-hood automotive and industrial environments without derating |
| Leakage Current | 5.0μA max @ 15.3V - ensures minimal standby power loss in battery-powered systems |
Pinout & Package
Package: DO-201 axial-leaded package with transfer-molded epoxy body (UL 94V-0 rated), 1.12g mass, and tin-finished leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connects to lower-potential side of protected node; forms symmetrical clamp path with cathode |
| Cathode | Current exit point in forward bias | Connects to higher-potential side; bidirectional operation means either terminal may serve as reference |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enables stable, repeatable avalanche characteristics and long-term reliability under thermal cycling |
| Bidirectional configuration | Provides symmetrical clamping for AC signals, differential buses, or ungrounded systems without polarity constraints |
| 1500W peak pulse rating | Supports coordination with 5mm x 20mm fuses and meets IEC 61000-4-5 surge immunity requirements |
| RoHS-compliant & halogen-free | Fulfills environmental compliance for automotive and industrial end equipment (Br+Cl <1500ppm, Sb <1000ppm) |
Applications
| Automotive Power Distribution | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protection of 12V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between battery rail and input filter capacitor. Use Value: Clamps transients to ≤25.2V within <1ns, preventing damage to 36V-rated DC-DC converters and microcontrollers. |
Use Scenario: Surge suppression on 24V digital input channels exposed to field wiring. IC Role / Device Role / Timing Role: Front-end transient absorber before optocoupler or Schmitt trigger input stage. Use Value: Limits induced surges to safe levels for 30V-tolerant logic inputs while maintaining <5μA leakage at 24V nominal. |
| Telecom Line Interface | Medical Equipment Power Entry |
Use Scenario: Protection of RS-485 transceivers connected to outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair (A/B) referenced to ground. Use Value: Symmetrical clamping ensures equal protection for both polarities of ESD and lightning-induced common-mode surges. |
Use Scenario: Input-stage surge protection for Class I medical power supplies (IEC 60601-1). IC Role / Device Role / Timing Role: Secondary-level clamp after primary MOV, reducing let-through voltage to isolation barrier. Use Value: 175°C max operating temperature supports sealed enclosure thermal profiles without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | 600W rating, SMB surface-mount package, 28.2V clamping at 21.2A | Limited to lower-energy surges; requires PCB space optimization instead of axial through-hole mounting | Select when board space is constrained and surge threat level is ≤IEC 61000-4-5 Level 3 |
| 1.5SMC18CA | 1500W rating, SMC package, 28.2V clamping at 53.0A, 2.5x smaller footprint than DO-201 | Higher thermal resistance (RθJA ≈ 60°C/W vs. DO-201's ~40°C/W); requires heatsinking for repeated surges | Choose for automated assembly and moderate repetition rate surges where axial leads are unacceptable |
Compared with 1.5KE18CA-T, SMBJ18CA offers compactness but reduced energy handling, while 1.5SMC18CA matches power rating in a smaller package at the cost of thermal performance-making the DO-201 version optimal for high-reliability, high-surge, through-hole designs.
Availability
1.5KE18CA-T is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O modules, and telecom line interface designs requiring stable component supply and full traceability.
Supply support for 1.5KE18CA-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with manufacturing certified to IATF 16949 and product qualification to AEC-Q200.
This TVS diode belongs to Diodes' 1.5KE series-engineered for high-power transient suppression in harsh environments, emphasizing robustness, consistency, and compliance with automotive and industrial safety standards.
FAQ
Is 1.5KE18CA-T suitable for automotive applications?
Yes. Though not explicitly AEC-Q200 qualified in its standard form, it is constructed in IATF 16949-certified facilities, uses glass-passivated die for reliability, and operates from -55°C to +175°C-meeting core environmental requirements for under-hood and chassis-mounted automotive electronics. Customers requiring formal PPAP or AEC-Q200 certification should contact Diodes directly for qualified variants.
What is the difference between 1.5KE18A and 1.5KE18CA?
The "C" suffix denotes bidirectional configuration: 1.5KE18CA clamps symmetrically for both positive and negative transients, while 1.5KE18A is unidirectional and requires correct polarity installation. Both share identical standoff (15.3V), breakdown (17.1V min), and clamping (25.2V) specifications, but only the CA version is appropriate for AC-coupled or floating nodes.
Can 1.5KE18CA-T replace a MOV in surge protection circuits?
No-it complements rather than replaces MOVs. MOVs handle higher total energy over longer durations (e.g., AC mains surges), while 1.5KE18CA-T responds faster (<1ns) and clamps more precisely but with lower total joule capacity. Best practice uses MOVs upstream for bulk energy absorption and TVS diodes like 1.5KE18CA-T downstream for fine clamping near sensitive ICs.
Does the DO-201 package support automated through-hole insertion?
Yes. The DO-201 axial package has standardized lead spacing (typically 5.0–5.2mm) and straight, tinned leads compatible with standard wave soldering and axial-component insertion equipment. Its 1.12g mass and epoxy body ensure mechanical stability during conveyor handling and thermal cycling.
1.5KE18CA-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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 59.5A
- 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
1.5KE18CA-T FAQ
1.How can I place an order for 1.5KE18CA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18CA-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 1.5KE18CA-T reliable?
The price and inventory of 1.5KE18CA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18CA-T is usually 5 days.
3.What payment methods are accepted for 1.5KE18CA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18CA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18CA-T?
1.5KE18CA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18CA-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 1.5KE18CA-T?
For technical support, including 1.5KE18CA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18CA-T requirements.
6.How does Aetrix verify that 1.5KE18CA-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE18CA-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 1.5KE18CA-T meets industry standards.
7.What is the process for return or replacement of 1.5KE18CA-T?
All 1.5KE18CA-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18CA-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 1.5KE18CA-T part is unused and in its original packaging.
Return procedure for 1.5KE18CA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18CA-T Tags
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