S4010R Equivalent & Substitute Parts

Part Overview

The S4010R is a Silicon Controlled Rectifier (SCR) rated for 400V off-state voltage with 10A RMS on-state current capacity, housed in a TO-220-3 through-hole package. Manufactured by Littelfuse Inc., this component is classified as a Standard Recovery thyristor designed for AC switching and control applications. The S4010R is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility within the same voltage and current class.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	400	V
Current - On State (It (RMS)) (Max)	10	A
Voltage - Gate Trigger (Vgt) (Max)	1.5	V
Current - Gate Trigger (Igt) (Max)	15	mA
Voltage - On State (Vtm) (Max)	1.6	V
Current - Hold (Ih) (Max)	30	mA
Operating Temperature Range	-40 to 125	°C
Package / Case	TO-220-3	-
SCR Type	Standard Recovery	-

Substitute Part Grouping Explanation

Substitution of the S4010R is determined by strict equivalence across the following electrical and mechanical criteria:

Primary Substitution Criteria:

Off-state voltage rating: 400V minimum
On-state current capacity (RMS): 8A or greater
Gate trigger voltage (Vgt): 1.5V maximum
Gate trigger current (Igt): 15mA or greater tolerance
On-state voltage drop (Vtm): 1.8V maximum
Hold current (Ih): 30mA or greater
Package type: TO-220-3 through-hole configuration
SCR recovery type: Standard Recovery

The MCR218-6G meets all primary substitution criteria and is classified as the manufacturer-recommended equivalent. This part maintains identical off-state voltage (400V), compatible on-state current rating (8A RMS), and identical package configuration (TO-220-3). Both components operate across the same temperature range (-40°C to 125°C) and share identical hold current specifications (30mA maximum).

Parameter Comparison

Parameter	S4010R	MCR218-6G	Unit
Voltage - Off State	400	400	V
Current - On State (It (RMS)) (Max)	10	8	A
Voltage - Gate Trigger (Vgt) (Max)	1.5	1.5	V
Current - Gate Trigger (Igt) (Max)	15	25	mA
Voltage - On State (Vtm) (Max)	1.6	1.8	V
Current - Hold (Ih) (Max)	30	30	mA
Current - Off State (Max)	10	10	µA
Operating Temperature Range	-40 to 125	-40 to 125	°C
Package / Case	TO-220-3	TO-220-3	-
SCR Type	Standard Recovery	Standard Recovery	-
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	-

Engineering Selection Recommendations

The MCR218-6G is the direct manufacturer-recommended substitute for the discontinued S4010R. Both components are manufactured by Littelfuse Inc. and maintain ROHS3 compliance with identical moisture sensitivity levels (MSL 1 - Unlimited). The MCR218-6G is currently in active production status with 1480 units in stock, ensuring supply chain availability.

The primary design consideration is the on-state current rating differential: the S4010R is rated for 10A RMS while the MCR218-6G is rated for 8A RMS. This 2A reduction in maximum current capacity must be evaluated against application requirements. The MCR218-6G is suitable for applications where the sustained on-state current does not exceed 8A RMS. Applications requiring the full 10A RMS capacity of the original S4010R require alternative sourcing strategies.

Both parts share identical off-state voltage (400V), gate trigger voltage (1.5V maximum), hold current (30mA maximum), and operating temperature range (-40°C to 125°C). The MCR218-6G exhibits a slightly higher on-state voltage drop (1.8V versus 1.6V maximum), which may result in marginally increased power dissipation in high-current applications but remains within acceptable thyristor performance parameters.

Frequently Asked Questions (FAQ)

Q: Can the MCR218-6G directly replace the S4010R in all applications?

A: The MCR218-6G is electrically compatible with the S4010R for applications where the on-state current does not exceed 8A RMS. If your application requires sustained currents above 8A RMS, the MCR218-6G is not suitable. Verify your circuit's maximum on-state current requirement before substitution.

Q: What is the difference between TO-220-3 and TO-220AB packaging?

A: Both the S4010R and MCR218-6G use TO-220-3 package configuration with three leads. The MCR218-6G is supplied in TO-220AB variant, which is mechanically and electrically identical to the standard TO-220-3 configuration. The AB designation indicates the specific supplier packaging format and does not affect pin compatibility or thermal performance.

Q: Are there electrical performance differences between these parts?

A: The MCR218-6G exhibits a maximum on-state voltage drop of 1.8V compared to the S4010R's 1.6V maximum. This 0.2V difference results in slightly higher power dissipation. The MCR218-6G also has a higher gate trigger current specification (25mA maximum versus 15mA maximum), which may require slightly higher gate drive current in control circuits.

Q: What compliance certifications apply to both parts?

A: Both the S4010R and MCR218-6G are ROHS3 compliant and carry identical moisture sensitivity levels (MSL 1 - Unlimited). Both are classified under ECCN EAR99 and HTSUS 8541.30.0080. No additional compliance documentation is required for substitution.

Q: Why is the S4010R discontinued?

A: The S4010R is discontinued at DiGi Electronics. The MCR218-6G represents the active production equivalent within the Littelfuse Standard Recovery SCR product line and is the manufacturer-recommended replacement.

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