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onsemi ICTE-18RL4G
- Part No.:
- ICTE-18RL4G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
ICTE-18RL4G.pdf
- Description:
- TVS DIODE 18VWM 30VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,608
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Product details
Overview
ICTE-18RL4G from onsemi is a unidirectional 1500 W peak power TVS diode in axial lead Surmetic package, designed for transient overvoltage protection of sensitive electronics. It features a 18 V working peak reverse voltage (VRWM), 24.2 V clamping voltage at 50 A peak pulse current (VC), <2 µA leakage at VRWM, <1 ns response time, and ESD rating >16 kV per HBM - deployed in industrial power supplies and medical equipment input stages.
For engineers reviewing the ICTE-18RL4G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 8.3 ms surge pulses, thermal derating above 75°C lead temperature, axial lead solderability at 260°C/10 s, and compatibility with Pb-free assembly processes.
Technical Context
This device operates as a Zener-based transient voltage suppressor, leveraging avalanche breakdown to clamp transients above its 21.2 V minimum breakdown voltage (VBR @ IT = 1 A). Its low dynamic impedance ensures stable clamping across 1–50 A surge currents, while the unidirectional configuration protects only against reverse-polarity surges.
The axial lead Case 41A package enables through-hole mounting with 20 °C/W junction-to-lead thermal resistance, supporting steady-state dissipation up to 5.0 W at TL ≤ 75°C. Derating follows Figure 2: power drops linearly to zero at TL = 175°C, and peak pulse capability reduces per Figure 1 above TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 18 V - maximum continuous reverse operating voltage before clamping begins |
| VC @ IPP = 50 A | 24.2 V - clamped voltage during 8.3 ms surge, limiting stress on downstream ICs |
| VBR @ IT = 1 A | 21.2 V min - precise avalanche onset threshold for predictable turn-on |
| PPK | 1500 W @ 1 ms - single-pulse energy handling capacity per IEC 61000-4-5 |
| IR @ VRWM | <2 µA - negligible standby leakage, critical for high-impedance sensor interfaces |
| Response Time | <1 ns - fast enough to suppress ESD and lightning-induced transients before damage occurs |
| ESD Rating | >16 kV HBM - exceeds Class 3 immunity requirements for end-equipment certification |
Pinout & Package
ICTE-18RL4G uses an axial lead Surmetic plastic package (Case 41A) with cathode indicated by a polarity band. Leads are corrosion-resistant, readily solderable, and rated for 260°C at 1/16″ from case for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or lower-potential rail in unidirectional protection configuration |
| Cathode | Current exit terminal during reverse clamping | Connected to protected line (e.g., DC input rail); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) without failure |
| Low clamping ratio (VC/VBR ≈ 1.14) | Minimizes overvoltage margin between clamping and IC absolute maximum ratings |
| Pb-Free Surmetic package | Complies with RoHS and JEDEC J-STD-020 reflow profiles for lead-free manufacturing |
| 20 °C/W junction-to-lead RθJL | Enables reliable thermal management in high-power density PCB layouts |
| Unidirectional polarity | Provides targeted protection against negative-going transients while allowing normal forward bias operation |
Applications
| Industrial Power Supply Input Protection | Medical Equipment ESD Shielding |
|---|---|
Use Scenario: Protecting AC/DC front-end rectifiers and bulk capacitors from line surges and load dump events. IC Role / Device Role / Timing Role: Standby shunt protector that remains non-conductive until transient exceeds 18 V, then clamps within 1 ns. Use Value: Limits input rail overshoot to 24.2 V during 50 A surges, preventing MOSFET gate oxide rupture and capacitor overvoltage failure. | Use Scenario: Safeguarding patient-connected analog front-ends (ECG, EEG) from electrostatic discharge during handling. IC Role / Device Role / Timing Role: High-speed voltage clamp placed at signal entry connectors to divert HBM ESD pulses (>16 kV). Use Value: Sub-1 ns response prevents ESD energy from coupling into precision amplifiers, preserving signal integrity and FDA-compliant immunity. |
| Process Control I/O Module Protection | Business Machine Power Sequencing |
Use Scenario: Shielding 24 V DC fieldbus inputs (e.g., Profibus, Modbus RTU) from induced lightning surges in factory environments. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly at connector to absorb common-mode transients before entering isolation barriers. Use Value: 1500 W surge rating sustains repeated 1 kV/500 A transients per IEC 61000-4-5, extending module service life in harsh EM environments. | Use Scenario: Securing 12 V auxiliary rails in multifunction printers and POS terminals during hot-plug events and internal switching noise. IC Role / Device Role / Timing Role: Low-leakage (2 µA) transient suppressor enabling stable brown-out detection and reset circuit operation. Use Value: Near-zero standby current avoids false resets while clamping 8.3 ms surges to 24.2 V, ensuring deterministic power-up sequencing. |
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; 600 W PPK; 28.2 V VC @ 21.2 A; bidirectional variant available | Requires PCB redesign for SMT placement; lower surge rating limits use in high-energy industrial surges | Select when space-constrained designs prioritize footprint over peak surge robustness |
| 1N6377RL4G | Same Case 41A package; higher VRWM (15 V); 20.1 V VC @ 60 A; 1500 W rating retained | Clamps at lower voltage but handles larger current; suitable where system operating voltage is 13.5–15 V DC | Choose for 15 V nominal systems needing tighter clamping margin than ICTE-18RL4G provides |
Compared with SMBJ18A and 1N6377RL4G, ICTE-18RL4G delivers superior 1500 W surge handling in a proven axial-leaded form factor, making it optimal for through-hole power supply inputs where mechanical robustness and thermal mass matter - unlike SMBJ18A's SMT limitation or 1N6377RL4G's lower VRWM mismatch for 18 V rails.
Availability
ICTE-18RL4G is available at Aetrix Electronics and suitable for industrial power supplies, medical diagnostic equipment, process control I/O modules, and business machine power sequencing requiring stable component supply and long-term obsolescence management.
Supply support for ICTE-18RL4G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The ICTE series belongs to onsemi's Mosorb transient voltage suppressor product line, engineered specifically for high-reliability, high-energy surge protection in mission-critical industrial and medical power systems.
FAQ
What is the clamping voltage of ICTE-18RL4G at its rated peak pulse current?
The ICTE-18RL4G has a maximum clamping voltage (VC) of 24.2 V when subjected to a 50 A peak pulse current (IPP) with an 8.3 ms waveform. This value is measured per Figure 5 in the official datasheet and defines the upper voltage limit imposed on protected circuits during surge events. The ICTE-18RL4G maintains this clamping performance consistently due to its low dynamic impedance and optimized Zener avalanche structure.
Is ICTE-18RL4G compatible with lead-free soldering processes?
Yes, ICTE-18RL4G is Pb-Free and qualified for lead-free assembly. Its axial leads are rated for 260°C at 1/16″ from the case for 10 seconds, fully compliant with J-STD-020 moisture sensitivity and reflow profiles. The Surmetic plastic body and corrosion-resistant finish ensure reliability during Pb-free wave or hand-soldering - a key requirement confirmed in the "Mechanical Characteristics" section of the ICTE-18RL4G datasheet.
How does ICTE-18RL4G differ from bidirectional TVS diodes like SMBJ18CA?
ICTE-18RL4G is unidirectional and protects only against reverse-polarity transients, whereas SMBJ18CA clamps both positive and negative excursions. This makes ICTE-18RL4G ideal for DC power rail protection where forward conduction must be avoided, while SMBJ18CA suits AC-coupled or floating signal lines. The ICTE-18RL4G also offers higher 1500 W peak power versus SMBJ18CA's 600 W, reflecting its axial package's superior thermal mass.
What is the maximum steady-state power dissipation for ICTE-18RL4G?
The ICTE-18RL4G supports 5.0 W steady-state power dissipation at a lead temperature (TL) of ≤75°C, with linear derating to zero at TL = 175°C. This rating assumes 3/8″ lead length and is defined in the "Maximum Ratings" table. Unlike its 1500 W peak pulse rating, this 5.0 W limit applies only to continuous DC or low-frequency conditions - not transient suppression duty cycles.
Can ICTE-18RL4G be used in place of 1N6377RL4G?
No - ICTE-18RL4G and 1N6377RL4G are not interchangeable without circuit review. ICTE-18RL4G has VRWM = 18 V and VC = 24.2 V @ 50 A, while 1N6377RL4G has VRWM = 15 V and VC = 20.1 V @ 60 A. Substituting ICTE-18RL4G in a 15 V system risks insufficient clamping margin; using 1N6377RL4G on an 18 V rail may cause premature conduction. Always verify operating voltage alignment before replacement.
ICTE-18RL4G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 21.2V
- Voltage - Clamping (Max) @ Ipp:
- 30V
- Current - Peak Pulse (10/1000µs):
- 50A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
ICTE-18RL4G FAQ
1.How can I place an order for ICTE-18RL4G through Aetrix?
Please submit a Request for Quotation (RFQ) for ICTE-18RL4G 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 ICTE-18RL4G reliable?
The price and inventory of ICTE-18RL4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICTE-18RL4G is usually 5 days.
3.What payment methods are accepted for ICTE-18RL4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICTE-18RL4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICTE-18RL4G?
ICTE-18RL4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICTE-18RL4G 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 ICTE-18RL4G?
For technical support, including ICTE-18RL4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICTE-18RL4G requirements.
6.How does Aetrix verify that ICTE-18RL4G is sourced from the original manufacturer or authorized distributors?
All ICTE-18RL4G 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 ICTE-18RL4G meets industry standards.
7.What is the process for return or replacement of ICTE-18RL4G?
All ICTE-18RL4G units undergo pre-shipment inspection (PSI). If there is an issue with ICTE-18RL4G, 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 ICTE-18RL4G part is unused and in its original packaging.
Return procedure for ICTE-18RL4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ICTE-18RL4G Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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