IL420-X008T Equivalent & Substitute Parts

Part Overview

The IL420-X008T is a 5.3kV isolation optoisolator with triac output manufactured by Vishay Semiconductor Opto Division. This component is designed for high-voltage isolation applications requiring single-channel triac switching. The part is currently obsolete, making equivalent substitutes necessary for ongoing system support and new designs. Substitute parts must maintain compatibility across isolation voltage, output type, channel configuration, and surface mount packaging.

Key Parameters

Parameter	IL420-X008T
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Output Type	Triac
Number of Channels	1
Voltage - Isolation	5300Vrms
Voltage - Off State	600 V
Static dV/dt (Min)	10kV/µs
Current - LED Trigger (Ift) (Max)	2mA
Current - On State (It (RMS)) (Max)	300 mA
Current - Hold (Ih)	500µA
Turn On Time	35µs
Voltage - Forward (Vf) (Typ)	1.16V
Current - DC Forward (If) (Max)	60 mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the IL420-X008T is determined by the following critical parameters:

Primary Compatibility Criteria:

Output Type: Triac (single channel)
Mounting Type: Surface Mount (6-SMD package)
Voltage - Isolation: Minimum 5000Vrms (IL420-X008T specifies 5300Vrms)
Voltage - Off State: 600 V
Static dV/dt: Minimum 10kV/µs
Operating Temperature Range: -55°C to 100°C or compatible subset

Substitute Categories:

Group 1: Direct Voltage Equivalents (5000Vrms Isolation) FOD420S, FOD420SD, FOD4216S, and FOD4216SD maintain the 5000Vrms isolation specification with 10kV/µs dV/dt rating, making them functionally equivalent for applications within the IL420-X008T's isolation voltage envelope.

Group 2: Lower Voltage Alternatives (4170Vrms Isolation) MOC3051SM, MOC3051SR2M, MOC3052SM, and MOC3052SR2M operate at 4170Vrms isolation with reduced dV/dt (1kV/µs). These parts are suitable only for applications where the lower isolation voltage and dV/dt specifications are acceptable.

Parameter Comparison

Parameter	IL420-X008T	FOD420S	FOD420SD	FOD4216S	FOD4216SD	MOC3051SM	MOC3051SR2M	MOC3052SM	MOC3052SR2M
Manufacturer	Vishay	Fairchild	onsemi	onsemi	onsemi	Fairchild	onsemi	onsemi	Fairchild
Output Type	Triac	Triac	Triac	Triac	Triac	Triac	Triac	Triac	Triac
Number of Channels	1	1	1	1	1	1	1	1	1
Voltage - Isolation	5300Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	4170Vrms	4170Vrms	4170Vrms	4170Vrms
Voltage - Off State	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V
Static dV/dt (Min)	10kV/µs	10kV/µs	10kV/µs	10kV/µs	10kV/µs	1kV/µs	1kV/µs	1kV/µs	1kV/µs
Current - LED Trigger (Ift) (Max)	2mA	2mA	2mA	1.3mA	1.3mA	15mA	15mA	10mA	10mA
Current - Hold (Ih)	500µA	500µA	500µA	500µA	500µA	220µA (Typ)	220µA (Typ)	220µA (Typ)	220µA (Typ)
Turn On Time	35µs	60µs	60µs	60µs	60µs	-	-	-	-
Voltage - Forward (Vf) (Typ)	1.16V	1.28V	1.28V	1.28V	1.28V	1.18V	1.18V	1.18V	1.18V
Current - DC Forward (If) (Max)	60 mA	30 mA	30 mA	30 mA	30 mA	60 mA	60 mA	60 mA	60 mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-SMD	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-	ROHS3 Compliant	ROHS3 Compliant	-

Engineering Selection Recommendations

For Direct Replacement (Preferred): FOD420SD and FOD4216SD are recommended as primary substitutes. Both are manufactured by onsemi with active product status, ROHS3 compliance, and 5000Vrms isolation voltage. FOD420SD offers higher current DC forward rating (30mA vs 60mA on IL420-X008T), while FOD4216S and FOD4216SD provide lower LED trigger current (1.3mA vs 2mA). All maintain the critical 10kV/µs dV/dt specification and 6-SMD surface mount package compatibility.

For Cost-Optimized Selection: FOD4216S in bulk packaging provides the lowest cost option while maintaining 5000Vrms isolation and 10kV/µs dV/dt performance. This part is suitable for high-volume applications where packaging format flexibility exists.

For Extended Temperature Range: The IL420-X008T operates to 100°C. FOD420S, FOD420SD, FOD4216S, and FOD4216SD maintain this full temperature range (-55°C to 100°C), making them suitable for thermal-demanding applications. MOC305x series parts are limited to -40°C to 85°C and are not recommended for applications requiring the full IL420-X008T temperature envelope.

For Lower Isolation Voltage Applications: MOC3052SM and MOC3052SR2M are suitable only when application isolation requirements are 4170Vrms or lower. These parts feature reduced dV/dt (1kV/µs) and lower operating temperature range (-40°C to 85°C). Selection of MOC305x series requires explicit confirmation that reduced isolation voltage and dV/dt specifications are acceptable.

Frequently Asked Questions (FAQ)

Q: Can FOD420SD directly replace IL420-X008T in all applications? A: FOD420SD is compatible for applications where 5000Vrms isolation is sufficient. The IL420-X008T specifies 5300Vrms isolation; FOD420SD provides 5000Vrms. Verify application isolation voltage requirements before substitution. Both parts maintain 10kV/µs dV/dt and 6-SMD surface mount compatibility.

Q: What is the difference between FOD4216S and FOD4216SD? A: FOD4216S is supplied in bulk packaging, while FOD4216SD is supplied in tape and reel format. Electrical specifications are identical. Selection depends on assembly process requirements and packaging format compatibility.

Q: Why do MOC3051 and MOC3052 parts have lower dV/dt ratings? A: MOC305x series parts specify 1kV/µs static dV/dt compared to 10kV/µs for FOD420x and IL420-X008T. This represents a fundamental design difference in the output stage. MOC305x parts are suitable only for applications where lower dV/dt performance is acceptable.

Q: Are all substitute parts RoHS3 compliant? A: FOD420SD, FOD4216S, FOD4216SD, MOC3051SR2M, and MOC3052SM are explicitly ROHS3 compliant. FOD420S and MOC3051SM do not specify RoHS status in available documentation. Verify RoHS compliance requirements for your application before final selection.

Q: What is the impact of different LED trigger current specifications? A: IL420-X008T specifies 2mA maximum LED trigger current. FOD4216S and FOD4216SD specify 1.3mA, while MOC305x series specify 10-15mA. Lower trigger current reduces input drive requirements; higher trigger current requires stronger input drive capability. Verify input circuit design compatibility with selected substitute part specifications.

Q: Can I use MOC3052SM in place of IL420-X008T? A: MOC3052SM is electrically compatible for triac output optoisolator applications but operates at 4170Vrms isolation versus IL420-X008T's 5300Vrms, and features 1kV/µs dV/dt versus 10kV/µs. Selection requires confirmation that reduced isolation voltage and dV/dt specifications meet application requirements. Operating temperature range is also limited to -40°C to 85°C.

Q: What packaging considerations apply to these substitutes? A: All substitute parts use 6-SMD surface mount packages compatible with IL420-X008T PCB layouts. FOD420S, FOD420SD, FOD4216S, and FOD4216SD specify gull wing lead configuration. Verify PCB footprint compatibility with selected substitute part lead geometry before assembly.

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