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Diodes Incorporated 1.5KE18A-T
- Part No.:
- 1.5KE18A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE18A-T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:3,194
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Product details
Overview
1.5KE18A-T from Diodes Incorporated is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for primary overvoltage protection of 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 1.5KE18A-T datasheet, 1.5KE18A-T pinout, 1.5KE18A-T application, or 1.5KE18A-T equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current handling under IEC 61000-4-5 surge waveforms, thermal derating above +25°C ambient, and axial-leaded mechanical compatibility with through-hole PCB layouts.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ps) and stable clamping performance under repetitive transients. Its DO-201 axial package supports lead-free soldering per MIL-STD-202 Method 208 and meets UL 94V-0 flammability rating.
The device operates with 5.0W steady-state power dissipation at 75°C lead temperature and withstands 200A non-repetitive forward surge current (8.3ms half-sine). Temperature coefficient of breakdown voltage is +0.088%/°C, enabling predictable voltage drift across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms pulse - sustains IEC 61000-4-5 Level 4 (4kV/2Ω) surges without failure |
| Reverse Standoff Voltage | 15.3V - maximum continuous DC voltage before significant leakage; sets upper limit for protected rail |
| Breakdown Voltage | 17.1V min @ 1mA - onset of avalanche conduction; defines clamping initiation threshold |
| Clamping Voltage | 25.2V max @ 59.5A - limits voltage seen by downstream circuit during surge event |
| 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 through-hole package with tin-finished leads, 1.12g mass, and UL 94V-0 epoxy molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or low-voltage reference; conducts during positive transients on cathode side |
| Cathode | High-side connection with cathode band marking | Connected to protected line; clamps positive surges to ground via avalanche conduction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| 1500W peak pulse power rating | Supports robust protection against high-energy transients including lightning-induced surges and inductive switching spikes |
| RoHS-compliant, halogen-free "Green" finish | Meets environmental compliance requirements for automotive and industrial end equipment without compromising electrical performance |
| Fast response time | Sub-nanosecond turn-on ensures clamping occurs before sensitive downstream components experience overvoltage damage |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12V battery-supplied ECUs exposed to load dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between battery feed and LDO/regulator input. Use Value: Limits transient voltage to ≤25.2V, preventing damage to 3.3V/5V logic supplies while surviving 1500W pulses. |
Use Scenario: 24V digital input modules receiving signals from field sensors in factory automation. IC Role / Device Role / Timing Role: Front-end surge suppression on dry-contact or PNP/NPN input channels. Use Value: Clamps induced surges from relay coil flyback or ESD events to safe levels before signal conditioning circuitry. |
| Telecom Line Interface Protection | DC Power Supply Output Protection |
Use Scenario: RS-485 transceivers connected to long cable runs in building management systems. IC Role / Device Role / Timing Role: Bidirectional protection (using 1.5KE18CA variant) on differential bus lines. Use Value: Maintains signal integrity by limiting common-mode transients to <±25.2V while preserving data rate up to 10 Mbps. |
Use Scenario: Secondary-side output of isolated DC-DC converters powering microcontrollers and sensors. IC Role / Device Role / Timing Role: Output rail clamp to prevent overvoltage propagation during regulator fault conditions. Use Value: Absorbs energy from transformer leakage inductance or feedback loop instability without affecting regulation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Lower 600W peak power; SMC (DO-214AB) surface-mount package; 20.0V clamping at 33.3A | Designed for space-constrained PCBs where reflow assembly is preferred over through-hole | Select when board area is limited and surge energy does not exceed 600W; verify thermal pad layout for SMBJ power derating |
| P6KE18A | Same DO-201 package but lower 600W rating; 20.0V clamping at 30A; higher leakage (10μA) | Legacy alternative with reduced surge capability; suitable only for less demanding IEC 61000-4-2 ESD scenarios | Choose only if cost sensitivity outweighs surge margin requirements; avoid for ISO 7637-2 or IEC 61000-4-5 applications |
Compared with 1.5KE18A-T, SMBJ18A offers smaller footprint but sacrifices >50% peak power handling, while P6KE18A retains identical packaging yet delivers significantly lower clamping performance and thermal robustness-making 1.5KE18A-T the optimal choice for high-energy industrial and automotive surge protection.
Availability
1.5KE18A-T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC inputs, telecom line interfaces, and DC power supply outputs requiring stable component supply and long-term production continuity.
Supply support for 1.5KE18A-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, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, automotive, and computing markets.
The 1.5KE series is part of Diodes' transient voltage suppressor portfolio, engineered specifically for high-energy surge immunity in harsh environments-emphasizing robust clamping, wide temperature operation, and AEC-Q200-aligned manufacturing processes.
FAQ
What is the difference between 1.5KE18A-T and 1.5KE18CA-T?
The 1.5KE18A-T is unidirectional and clamps only positive transients on its cathode terminal, while the 1.5KE18CA-T is bidirectional and protects against both polarities. The bidirectional version has symmetric breakdown behavior and no cathode band marking, making it suitable for AC-coupled or differential signal lines like RS-485 or CAN bus interfaces.
Can 1.5KE18A-T be used in place of a Zener diode for voltage regulation?
No-1.5KE18A-T is optimized for transient suppression, not steady-state regulation. Its leakage current (5μA at 15.3V) and dynamic impedance are not specified for regulation stability, and it lacks tight tolerance on breakdown voltage (17.1V to 18.9V range). Use dedicated Zener diodes such as BZX84-C18 for precision voltage reference applications.
What is the maximum allowable PCB trace length between 1.5KE18A-T and the protected IC?
To maintain effective clamping, the total inductance of the path-including PCB traces and leads-must be minimized. For 1.5KE18A-T's sub-nanosecond response, keep total series inductance below 10 nH, which typically corresponds to ≤10 mm of direct trace length from cathode to protected node and anode to ground plane, with no vias or routing detours.
Does 1.5KE18A-T meet AEC-Q200 qualification requirements?
While 1.5KE18A-T is manufactured in IATF 16949-certified facilities and supports PPAP documentation, it is not individually AEC-Q200 qualified. Diodes offers AEC-Q200-qualified variants under the "Automotive Grade" designation (e.g., 1.5KE18A-Q); consult Diodes' automotive product selector or contact their applications team for qualified alternatives.
1.5KE18A-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:
- 1
- Bidirectional Channels:
- -
- 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
1.5KE18A-T FAQ
1.How can I place an order for 1.5KE18A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18A-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 1.5KE18A-T reliable?
The price and inventory of 1.5KE18A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18A-T is usually 5 days.
3.What payment methods are accepted for 1.5KE18A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18A-T?
1.5KE18A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18A-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 1.5KE18A-T?
For technical support, including 1.5KE18A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18A-T requirements.
6.How does Aetrix verify that 1.5KE18A-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE18A-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 1.5KE18A-T meets industry standards.
7.What is the process for return or replacement of 1.5KE18A-T?
All 1.5KE18A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18A-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 1.5KE18A-T part is unused and in its original packaging.
Return procedure for 1.5KE18A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18A-T Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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