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onsemi 1.5KE18ARL4
- Part No.:
- 1.5KE18ARL4
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1.5KE18ARL4.pdf
- Description:
- TVS 1500W 18V UNIDIRECT AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,866
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Product details
Overview
1.5KE18ARL4 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel 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 clamping voltage (VC) at 59.5 A peak pulse current (IPP), and sub-1 ns response time. It is widely deployed in industrial power supplies and communication interface circuits.
For engineers reviewing the 1.5KE18ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, VC vs. IC absolute maximum ratings, UL 497B certification for loop protection, and axial lead (Case 41A) mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a silicon avalanche diode with sharp Zener-like breakdown characteristics, triggered when reverse voltage exceeds VBR. Its low dynamic impedance (<1 Ω typical above VBR) ensures stable clamping under fast-rising transients up to 1 ms duration.
Designed for non-repetitive surge suppression, it complies with IEC 61000-4-2 Class 3 (>16 kV HBM ESD) and UL 497B for isolated loop circuit protection. Thermal resistance (RJL = 20 °C/W) and steady-state power dissipation (5.0 W @ TL ≤ 75 °C) define its continuous thermal handling capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - withstands high-energy lightning-induced surges per IEC 61000-4-5 |
| Working Peak Reverse Voltage | 15.3 V - must be ≥ DC/peak operating voltage of protected line (e.g., 12 V rail) |
| Breakdown Voltage | 17.1–18.9 V @ 1 mA - defines precise conduction onset threshold |
| Clamping Voltage | 25.2 V @ 59.5 A - maximum voltage seen by downstream IC during worst-case surge |
| Leakage Current | <5 µA @ 15.3 V - negligible standby power loss and signal integrity impact |
| Response Time | <1 ns - limits overshoot before clamping engages in high-speed interfaces |
| ESD Rating | Class 3 (>16 kV HBM) - meets stringent electrostatic discharge immunity requirements |
Pinout & Package
1.5KE18ARL4 uses an axial-leaded Surmetic plastic package (Case 41A), with cathode indicated by a polarity band. Leads are tin-plated copper, solderable at 260 °C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for reverse-biased operation | Connected to lower-potential side (e.g., GND or return path) of protected line |
| Cathode | Transient energy sink terminal | Connected to higher-potential side (e.g., VIN, data line) - polarity band identifies this pin |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - enables compliance in telecom and industrial fieldbus designs |
| Low Clamping Ratio (VC/VBR) | 1.40 (25.2 V / 18 V) - tight voltage control minimizes stress on downstream MOSFETs or interface ICs |
| Pb-Free Axial Package | RoHS-compliant Case 41A construction - supports automated through-hole assembly without lead-free process conflicts |
| High Surge Current Capacity | 59.5 A peak pulse current - handles 10/1000 µs waveform surges common in AC/DC front-ends and motor drives |
Applications
| Industrial Power Supply Input Protection | RS-485/422 Data Line Protection |
|---|---|
Use Scenario: 24 V DC input stage of PLC power module exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input terminals to clamp transients before upstream rectifier and bulk capacitor. Use Value: 25.2 V clamping ensures downstream 30 V-rated MOSFETs and controllers remain within safe operating area during 1500 W surges. | Use Scenario: Termination point of long-haul RS-485 bus in factory automation, subject to ground potential differences and ESD events. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional 1.5KE18ARL4 guards receiver inputs referenced to local ground. Use Value: Sub-1 ns response prevents >15 V overshoot from damaging ±12 V-tolerant transceivers such as SN65HVD72. |
| Medical Equipment AC-DC Adapter Interface | Point-of-Sale Terminal Power Entry |
Use Scenario: Secondary-side 12 V output of medical-grade AC-DC adapter, feeding safety-critical monitoring circuitry. IC Role / Device Role / Timing Role: Final-stage TVS on low-voltage rail to suppress coupling from primary-side transients and internal switching noise. Use Value: UL 497B recognition validates use in patient-connected equipment where isolation barrier integrity is mandated. | Use Scenario: 12 V power entry of retail POS terminal with exposed USB and Ethernet ports. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC input, coordinated with fuse and PTC for fault containment. Use Value: 15.3 V VRWM provides 25% margin over nominal 12 V supply while avoiding false triggering during brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Surface-mount SMB package; same 18 V VBR but lower 600 W peak power rating | Requires PCB redesign for SMT layout; unsuitable for high-energy 1500 W surges | Select only if board space constraints prohibit axial components and surge energy is limited to ≤600 W |
| 1.5KE18A | Same electrical specs and Case 41A package; differs only in packaging format (bulk vs. tape & reel) | No functional or layout impact - identical performance and mounting | Choose 1.5KE18A for manual prototyping or low-volume builds; 1.5KE18ARL4 preferred for automated assembly |
Compared with SMBJ18A, 1.5KE18ARL4 delivers 2.5× higher surge energy handling in axial form; compared with 1.5KE18A, it offers optimized tape-and-reel delivery for pick-and-place manufacturing without electrical or thermal trade-offs.
Availability
1.5KE18ARL4 is available at Aetrix Electronics and suitable for industrial power supplies, communication interface protection, and medical equipment requiring stable component supply with full traceability and lifecycle management.
Supply support for 1.5KE18ARL4 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, sensor, and logic devices for automotive, industrial, cloud, and IoT applications.
The 1.5KE18ARL4 belongs to the 1.5KE series of Mosorb™ TVS diodes - engineered for robust, cost-effective overvoltage protection in high-reliability industrial and communications systems where axial-leaded reliability and UL-certified performance are mandatory.
FAQ
What is the clamping voltage of the 1.5KE18ARL4 under maximum surge conditions?
The 1.5KE18ARL4 has a maximum clamping voltage (VC) of 25.2 V at 59.5 A peak pulse current (IPP), measured using the standard 10/1000 µs double-exponential waveform. This value ensures protected circuits-such as 30 V-rated MOSFETs or 24 V logic interfaces-remain within safe operating limits during transient events. The clamping performance is guaranteed across the full operating temperature range of −65 °C to +175 °C.
Is the 1.5KE18ARL4 RoHS compliant and lead-free?
Yes, the 1.5KE18ARL4 is a Pb-free device packaged in ON Semiconductor's Surmetic axial leaded Case 41A. The "G" suffix in the full orderable part number (1.5KE18ARL4G) explicitly denotes RoHS compliance and lead-free construction. Lead finish is matte tin, fully compatible with standard SnPb and lead-free soldering processes up to 260 °C for 10 seconds.
Does the 1.5KE18ARL4 meet UL 497B certification?
Yes, the 1.5KE18ARL4 is UL Recognized under file E210057, category QVGQ2, per UL 497B for protectors used in isolated loop circuits. This certification covers dielectric withstand, endurance conditioning, and strike voltage breakdown testing - confirming suitability for telecom, industrial fieldbus, and medical isolation barrier applications where regulatory compliance is mandatory.
How does the 1.5KE18ARL4 compare to bidirectional TVS diodes like 1.5KE18CA?
The 1.5KE18ARL4 is unidirectional and optimized for DC or single-polarity signal lines (e.g., 12 V supply rails), offering tighter leakage (<5 µA @ VRWM) and lower capacitance than bidirectional variants. In contrast, 1.5KE18CA provides symmetrical clamping for AC signals or differential buses but exhibits higher leakage and reduced VRWM margin. Use 1.5KE18ARL4 where polarity is fixed and low standby current is critical.
What is the thermal resistance and steady-state power rating of the 1.5KE18ARL4?
The 1.5KE18ARL4 has a junction-to-lead thermal resistance (RJL) of 20 °C/W and a steady-state power dissipation (PD) of 5.0 W at lead temperature (TL) ≤ 75 °C. Derating is linear at 20 mW/°C above 75 °C. These values assume 3/8-inch lead length and free-air conditions - critical for thermal design when integrating into enclosed power supplies or high-ambient environments.
1.5KE18ARL4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
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- Supplier Device Package:
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1.5KE18ARL4 FAQ
1.How can I place an order for 1.5KE18ARL4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18ARL4 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 1.5KE18ARL4 reliable?
The price and inventory of 1.5KE18ARL4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18ARL4 is usually 5 days.
3.What payment methods are accepted for 1.5KE18ARL4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18ARL4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18ARL4?
1.5KE18ARL4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18ARL4 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 1.5KE18ARL4?
For technical support, including 1.5KE18ARL4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18ARL4 requirements.
6.How does Aetrix verify that 1.5KE18ARL4 is sourced from the original manufacturer or authorized distributors?
All 1.5KE18ARL4 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 1.5KE18ARL4 meets industry standards.
7.What is the process for return or replacement of 1.5KE18ARL4?
All 1.5KE18ARL4 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18ARL4, 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 1.5KE18ARL4 part is unused and in its original packaging.
Return procedure for 1.5KE18ARL4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18ARL4 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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