FOD4118T Equivalent & Substitute Parts

Part Overview

The FOD4118T is an optoisolator with triac output rated for 5000Vrms isolation voltage, designed for single-channel applications requiring galvanic isolation in AC switching circuits. This component features a zero-crossing detection circuit and is packaged in a 6-DIP through-hole configuration. The FOD4118T is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Isolation Voltage	5000Vrms
Output Type	Triac
Zero Crossing Circuit	Yes
Number of Channels	1
Package / Case	6-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 100°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the FOD4118T is determined by the following critical parameters:

Isolation voltage rating (minimum 5000Vrms for direct replacement)
Triac output configuration with zero-crossing detection
Single-channel architecture
6-DIP through-hole package format
Operating temperature range compatibility (-55°C to 100°C)
Regulatory approvals (CSA, UL certification)

Two substitute parts meet these criteria with varying electrical characteristics:

FOD4118TV (onsemi): Direct functional equivalent with identical isolation voltage and electrical specifications. Differs only in packaging format (bulk vs. standard) and product status (active vs. obsolete).

IL4118-X006 (Vishay Semiconductor Opto Division): Functionally compatible substitute with enhanced isolation voltage (5300Vrms) and improved performance characteristics. Maintains identical package format and zero-crossing functionality.

Parameter Comparison

Parameter	FOD4118T	FOD4118TV	IL4118-X006
Manufacturer	onsemi	onsemi	Vishay Semiconductor Opto Division
Voltage - Isolation	5000Vrms	5000Vrms	5300Vrms
Voltage - Off State	800V	800V	800V
Output Type	Triac	Triac	Triac
Zero Crossing Circuit	Yes	Yes	Yes
Number of Channels	1	1	1
Static dV/dt (Min)	10kV/µs	10kV/µs	10kV/µs
Current - LED Trigger (Ift) (Max)	1.3mA	1.3mA	1.3mA
Current - Hold (Ih)	500µA	500µA	200µA
Turn On Time	60µs	60µs	35µs
Voltage - Forward (Vf) (Typ)	1.25V	1.25V	1.3V
Current - DC Forward (If) (Max)	30mA	30mA	60mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
Approval Agency	CSA, UL	CSA, UL, VDE	BSI, CSA, cUR, FIMKO, UR

Engineering Selection Recommendations

FOD4118TV is the primary substitute for the obsolete FOD4118T. Both components are manufactured by onsemi and share identical electrical specifications, isolation voltage ratings, and package configurations. FOD4118TV maintains active product status with expanded regulatory approvals (VDE certification added) and ROHS3 compliance. This part provides direct functional replacement with no design modifications required.

IL4118-X006 serves as an alternative substitute when enhanced performance characteristics are acceptable. The Vishay component offers superior isolation voltage (5300Vrms vs. 5000Vrms), faster turn-on time (35µs vs. 60µs), and lower hold current (200µA vs. 500µA). IL4118-X006 maintains identical package format and zero-crossing functionality. This part is suitable for applications where improved performance margins are beneficial. Regulatory approvals include BSI, CSA, cUR, FIMKO, and UR certifications.

Both substitutes are actively manufactured and available in production quantities, addressing the obsolescence of the original FOD4118T.

Frequently Asked Questions (FAQ)

Q: Can FOD4118TV be used as a direct replacement for FOD4118T?

A: Yes. FOD4118TV is manufactured by the same supplier (onsemi) and provides identical electrical specifications, isolation voltage, and package configuration. No circuit modifications are required for substitution.

Q: What are the key differences between FOD4118TV and IL4118-X006?

A: Both parts maintain the same package format (6-DIP) and zero-crossing functionality. IL4118-X006 offers higher isolation voltage (5300Vrms vs. 5000Vrms), faster switching (35µs vs. 60µs turn-on time), and lower hold current (200µA vs. 500µA). The parts are from different manufacturers (onsemi vs. Vishay) with different regulatory approval bodies.

Q: Are both substitute parts available in the same packaging options?

A: FOD4118TV is supplied in bulk packaging, while IL4118-X006 is supplied in tube packaging. Both use the same 6-DIP through-hole package format suitable for PCB assembly.

Q: Do the substitute parts meet the same regulatory requirements as the original FOD4118T?

A: FOD4118TV includes CSA and UL approvals matching the original, with additional VDE certification. IL4118-X006 includes CSA approval plus BSI, cUR, FIMKO, and UR certifications. Both meet or exceed the original regulatory requirements.

Q: What is the operating temperature range for the substitute parts?

A: Both FOD4118TV and IL4118-X006 operate across the same temperature range as the original: -55°C to 100°C.

Q: Can IL4118-X006 be used in applications designed for FOD4118T?

A: Yes, IL4118-X006 is functionally compatible. The higher isolation voltage and improved performance characteristics make it suitable for FOD4118T applications. The identical package format and zero-crossing circuit ensure pin-compatible operation.

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