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onsemi 1.5KE18AG
- Part No.:
- 1.5KE18AG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE18AG.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:1,644
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Product details
Overview
1.5KE18AG from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics. 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 - ideal for safeguarding power supplies and industrial control interfaces against ESD and lightning-induced surges.
For engineers reviewing the 1.5KE18AG datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 1 ms 1500 W transients, UL 497B certification for isolated loop protection, Pb-free axial lead (Case 41A) compatibility with wave soldering at 260°C, and ESD robustness (>16 kV HBM).
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt device in parallel with protected circuitry, triggering when transient voltage exceeds its 18 V breakdown threshold. Its low dynamic impedance and fast avalanche response (<1 ns) enable rapid energy diversion away from downstream ICs like CMOS, MOS, and bipolar logic.
The device complies with UL 497B for isolated loop circuit protection and meets Class 3 ESD immunity (>16 kV per Human Body Model). Thermal resistance is 20 °C/W (junction-to-lead), with steady-state power dissipation derated above 75°C ambient and 5.0 W maximum at TL ≤ 75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - handles high-energy transients without failure |
| Working Peak Reverse Voltage | 15.3 V - sets minimum operating voltage threshold before conduction |
| Breakdown Voltage | 17.1–18.9 V @ 1 mA - defines precise avalanche onset range for reliable triggering |
| Clamping Voltage | 25.2 V @ 59.5 A IPP - limits protected circuit voltage during surge |
| Leakage Current | <5 µA @ 15.3 V VRWM - ensures minimal standby power loss and signal integrity |
| Response Time | <1 ns - enables suppression before transient propagates into IC inputs |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4 for system-level robustness |
Pinout & Package
1.5KE18AG uses an axial-leaded Surmetic plastic package (Case 41A), with cathode identified by a polarity band. Leads are corrosion-resistant, readily solderable, and rated for 260°C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during reverse-biased clamping | Connected to ground or low-impedance return path to sink surge current |
| Cathode | Current exit point during clamping; marked with band | Connected to protected line (e.g., VCC, signal) to clamp overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - supports safety-critical telecom and industrial interface designs |
| Pb-Free Axial Package | RoHS-compliant Case 41A construction - compatible with lead-free assembly and long-term supply chain requirements |
| Low Clamping Ratio | VC/VBR ≈ 1.40 - tight voltage margin between trigger and clamp improves system margin vs. overvoltage damage |
| High Surge Current Capacity | 59.5 A peak pulse current - sustains multiple 1500 W transients without degradation |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
Use Scenario: Protecting DC output rails of AC/DC converters against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Shunt clamping element placed directly across regulated output to limit voltage excursion during fault conditions. Use Value: Prevents latch-up or destruction of downstream regulators and microcontrollers by holding rail voltage ≤25.2 V during 1500 W surges. | Use Scenario: Safeguarding RS-485/RS-232 transceivers connected to external wiring exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on data lines and power pins of communication ICs. Use Value: Maintains signal integrity and prevents permanent damage to transceiver inputs by clamping transients within <1 ns and limiting voltage to 25.2 V. |
| Medical Equipment Input Stage | Automated Test Equipment (ATE) |
Use Scenario: Shielding analog front-end circuitry in patient-monitoring devices from ESD events during handling or cable coupling. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) TVS placed at connector entry points before precision amplifiers and ADCs. Use Value: Ensures baseline accuracy is preserved during normal operation while providing >16 kV HBM ESD immunity without loading sensitive nodes. | Use Scenario: Protecting digital I/O channels and relay drivers in programmable logic controllers from back-EMF and contact bounce. IC Role / Device Role / Timing Role: Unidirectional clamping device on 24 V control lines feeding solenoids and indicator LEDs. Use Value: Absorbs repetitive 1500 W transients without parameter drift, enabling reliable long-term operation in factory-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | 600 W rating, SMC package, 28.2 V VC @ 21.2 A IPP | Lower power handling; suited for space-constrained PCBs where 1500 W is not required | Select SMBJ18A for compact surface-mount layouts with moderate surge exposure |
| 1.5KE18A | Same electrical specs but SnPb lead finish (non-Pb-free) | Identical clamping and thermal performance; differs only in RoHS compliance | Choose 1.5KE18A only if legacy SnPb assembly process mandates non-Pb-free leads |
Compared with SMBJ18A and 1.5KE18A, the 1.5KE18AG delivers full 1500 W surge capability in a Pb-free axial package with UL 497B recognition - making it optimal for high-reliability industrial and medical systems requiring certified, through-hole surge protection.
Availability
1.5KE18AG is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure, medical instrumentation, and automated test equipment requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE18AG 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 is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, and IoT applications.
The 1.5KE18AG belongs to the 1.5KE series of Mosorb transient voltage suppressors - engineered specifically for high-power, unidirectional clamping in harsh electromagnetic environments where reliability and safety certification are mandatory.
FAQ
What is the clamping voltage of the 1.5KE18AG under maximum surge conditions?
The 1.5KE18AG has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current of 59.5 A, measured using the standard 1 ms exponential waveform per Figure 5 in the datasheet. This value ensures protected circuits remain below critical overvoltage thresholds during transient events, and is confirmed across production lots per ON Semiconductor's characterization protocol.
Is the 1.5KE18AG RoHS compliant and what does the 'G' suffix indicate?
Yes, the 1.5KE18AG is RoHS compliant. The 'G' suffix explicitly denotes a Pb-free axial lead package conforming to JEDEC standards and ON Semiconductor's Pb-free manufacturing specifications. This includes lead finishes and mold compound meeting EU RoHS Directive 2011/65/EU requirements, verified through material declarations and third-party testing.
Does the 1.5KE18AG meet any safety certifications for use in isolated circuits?
Yes, the 1.5KE18AG is UL Recognized under UL 497B (File #E210057) for isolated loop circuit protection. This certification covers dielectric withstand, endurance conditioning, and strike voltage breakdown tests - confirming suitability for telecom, medical, and industrial isolation barriers where regulatory compliance is required.
What is the maximum steady-state power dissipation for the 1.5KE18AG at elevated temperatures?
The 1.5KE18AG has a steady-state power dissipation (PD) of 5.0 W at lead temperature (TL) ≤ 75°C, with linear derating of 20 mW/°C above that point. At TL = 100°C, PD drops to 4.5 W; at TL = 125°C, it is 4.0 W. This thermal profile is defined in the Maximum Ratings table and validated via junction-to-lead resistance (RJL = 20 °C/W).
How does the 1.5KE18AG compare to bidirectional TVS diodes in surge protection applications?
The 1.5KE18AG is unidirectional and optimized for DC-biased lines like power rails or single-polarity signal paths, offering tighter clamping (25.2 V) and lower leakage (<5 µA) than equivalent bidirectional parts. Bidirectional variants (e.g., 1.5KE18CA) are used for AC lines or differential signals but exhibit higher capacitance and symmetric clamping - making the 1.5KE18AG preferable for most DC protection scenarios.
1.5KE18AG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V (Max)
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1.5KE18AG FAQ
1.How can I place an order for 1.5KE18AG through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18AG 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 1.5KE18AG reliable?
The price and inventory of 1.5KE18AG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18AG is usually 5 days.
3.What payment methods are accepted for 1.5KE18AG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18AG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18AG?
1.5KE18AG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18AG 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 1.5KE18AG?
For technical support, including 1.5KE18AG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18AG requirements.
6.How does Aetrix verify that 1.5KE18AG is sourced from the original manufacturer or authorized distributors?
All 1.5KE18AG 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 1.5KE18AG meets industry standards.
7.What is the process for return or replacement of 1.5KE18AG?
All 1.5KE18AG units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18AG, 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 1.5KE18AG part is unused and in its original packaging.
Return procedure for 1.5KE18AG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18AG Tags
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