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onsemi 1.5KE18A
- Part No.:
- 1.5KE18A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1.5KE18A.pdf
- Description:
- TVS 1500W 18V UNIDIRECT AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,520
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Product details
Overview
1.5KE18A from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning surges, and inductive switching transients. It features a 15.3 V working peak reverse voltage (VRWM), 18 V nominal breakdown voltage (VBR), 25.2 V maximum clamping voltage (VC) at 59.5 A peak pulse current (IPP), and sub-1 ns response time - deployed in power supplies, industrial controls, and medical equipment.
For engineers reviewing the 1.5KE18A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current handling under IEC 61000-4-5 waveforms, UL 497B recognition for isolated loop protection, and axial leaded Surmetic package compatibility with through-hole PCB assembly.
Technical Context
The 1.5KE18A operates as a silicon avalanche diode in reverse-biased configuration, entering conduction when transient voltage exceeds its 17.1–18.9 V breakdown range (VBR @ IT = 1 mA). Its low dynamic impedance and fast <1 ns response enable effective suppression of high-dV/dt transients without significant overshoot when mounted with minimal lead length.
It is rated for 1500 W nonrepetitive peak pulse power (1 ms, 10/1000 μs waveform), derates linearly above 25°C ambient, and maintains ≤5 μA leakage at VRWM. The device meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection - critical for telecom and industrial interface ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15.3 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system DC bus tolerance margin. |
| VBR @ IT=1 mA | 17.1–18.9 V - Breakdown threshold range; defines turn-on consistency across production lots. |
| VC @ IPP=59.5 A | 25.2 V - Clamped voltage during 1 ms surge; determines maximum stress on downstream ICs. |
| IPP | 59.5 A - Peak pulse current capability at 1 ms; correlates to IEC 61000-4-5 Level 4 (4 kV) surge survivability. |
| Response Time | <1 ns - Enables suppression before transient energy couples into protected circuitry. |
| Leakage @ VRWM | <5 μA - Negligible standby power loss in always-on systems like battery-backed controllers. |
| UL Recognition | UL 497B QVGQ2 - Certified for use in isolated communication loops per safety standard. |
Pinout & Package
Package: Axial-leaded Surmetic plastic case (CASE 41A), Pb-free, cathode indicated by band. Dimensions: 8.5–9.5 mm length × 4.8–5.3 mm diameter; lead diameter uncontrolled, max soldering temperature 260°C at 1/16″ from case for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms return path during clamping. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., VCC, signal); polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports robust protection against 4 kV IEC 61000-4-5 surges without degradation. |
| Clamping ratio VC/VBR = 1.40 | Ensures tight voltage control - lower ratio reduces risk of overvoltage damage to downstream logic. |
| ESD rating >16 kV (HBM) | Meets IEC 61000-4-2 Level 4 for handling and board-level ESD immunity. |
| UL 497B recognition | Validated for safety-critical isolated loop applications including RS-485 and PoE interfaces. |
| Low zener impedance | Maintains stable clamping under high di/dt transients, minimizing voltage overshoot. |
Applications
| Industrial Power Supply Input Protection | Medical Equipment ESD Shielding |
|---|---|
Use Scenario: AC/DC power supply front-end subjected to lightning-induced surges on mains lines. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping common-mode transients between L/N and PE. Use Value: Limits input rail voltage to ≤25.2 V during 59.5 A surge, preventing damage to bridge rectifier and primary-side controller. | Use Scenario: Patient-connected sensor interface exposed to electrostatic discharge during handling. IC Role / Device Role / Timing Role: Low-leakage (<5 μA) transient clamp on analog front-end inputs. Use Value: Maintains signal integrity while diverting >16 kV HBM events away from precision amplifiers and ADCs. |
| RS-485 Communication Port Protection | PLC Digital I/O Module Protection |
Use Scenario: Industrial fieldbus node connected to long cable runs susceptible to induced surges. IC Role / Device Role / Timing Role: UL 497B-recognized TVS on differential A/B lines referenced to signal ground. Use Value: Ensures compliance with isolated loop safety requirements while clamping transients to 25.2 V before receiver IC thresholds are exceeded. | Use Scenario: Programmable logic controller module with 24 V DC digital inputs exposed to inductive load switching noise. IC Role / Device Role / Timing Role: Reverse-biased clamp across input terminals to absorb flyback energy from solenoids and relays. Use Value: Prevents latch-up or destruction of input optocouplers by limiting transient voltage to safe levels within 1 ns. |
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 | Surface-mount SMB package; 600 W rating; 28.2 V clamping at 21.3 A IPP. | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 without parallel staging. | Select when board space is constrained and surge threat level is ≤2 kV. |
| 1.5KE18CA | Bi-directional variant; same VRWM/VBR/VC ratings but conducts in both polarities. | Required for AC-coupled or bidirectional signal lines (e.g., Ethernet PHY, audio). | Choose only if protecting symmetrical signals or AC-powered circuits where reverse polarity transients occur. |
Compared with SMBJ18A and 1.5KE18CA, the 1.5KE18A offers higher surge capacity in a through-hole package ideal for high-reliability industrial power rails, while avoiding unnecessary bidirectional conduction or footprint constraints.
Availability
1.5KE18A is available at Aetrix Electronics and suitable for industrial power supplies, medical instrumentation, RS-485 networks, and PLC I/O modules requiring stable component supply with full traceability and lifecycle support.
Supply support for 1.5KE18A 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
ON Semiconductor (now part of onsemi) is a global semiconductor supplier specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The 1.5KE18A belongs to the Mosorb 1.5KE series - engineered specifically for high-energy transient suppression in harsh environments, with emphasis on reliability, UL certification, and axial-leaded mechanical robustness for through-hole manufacturing.
FAQ
What is the clamping voltage of the 1.5KE18A under maximum surge conditions?
The 1.5KE18A has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current of 59.5 A (1 ms exponential decay waveform). This value is measured per Figure 5 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. Designers must ensure downstream components tolerate this clamped voltage with margin.
Is the 1.5KE18A RoHS compliant and lead-free?
Yes, the "G" suffix in 1.5KE18A, G confirms the device uses a Pb-free Surmetic axial package per ON Semiconductor's RoHS compliance program. The datasheet specifies maximum lead temperature of 260°C for 10 seconds during soldering, consistent with lead-free reflow profiles. Full compliance documentation is available under onsemi's environmental reports.
Does the 1.5KE18A meet UL 497B for isolated loop protection?
Yes, the 1.5KE18A is explicitly listed in the UL 497B recognition (File #E210057, category QVGQ2) for isolated loop circuit protection. This certification covers dielectric withstand, endurance conditioning, and strike voltage breakdown testing - confirming suitability for telecom, industrial fieldbus, and medical isolation barrier applications.
How does the 1.5KE18A differ from the bi-directional 1.5KE18CA?
The 1.5KE18A is unidirectional and conducts only during positive transients on the cathode, whereas the 1.5KE18CA conducts in both directions. Their VRWM, VBR, and VC values are identical, but the 1.5KE18CA is required for AC-coupled or bipolar signal lines. Using 1.5KE18A in place of 1.5KE18CA on bidirectional paths risks failure during negative excursions.
What is the maximum steady-state power dissipation for the 1.5KE18A at 75°C lead temperature?
At a lead temperature (TL) of 75°C, the 1.5KE18A supports 5.0 W steady-state power dissipation. Above 75°C, it derates at 20 mW/°C - reaching zero dissipation at 325°C (though operational junction limit remains −65°C to +175°C). This rating applies only to continuous DC or low-frequency reverse bias, not transient suppression duty cycles.
1.5KE18A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- -
1.5KE18A FAQ
1.How can I place an order for 1.5KE18A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18A 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 reliable?
The price and inventory of 1.5KE18A 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 is usually 5 days.
3.What payment methods are accepted for 1.5KE18A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18A?
1.5KE18A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18A 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?
For technical support, including 1.5KE18A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18A requirements.
6.How does Aetrix verify that 1.5KE18A is sourced from the original manufacturer or authorized distributors?
All 1.5KE18A 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 meets industry standards.
7.What is the process for return or replacement of 1.5KE18A?
All 1.5KE18A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18A, 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 part is unused and in its original packaging.
Return procedure for 1.5KE18A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18A Tags
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onsemi
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