S2055RTP Equivalent & Substitute Parts

Part Overview

The S2055RTP is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage with 55A RMS current capacity, manufactured by Littelfuse Inc. in a TO-220-3 through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The S2055RTP operates across a temperature range of -40°C to 125°C and is ROHS3 compliant.

Key Parameters

Parameter	Value
Voltage - Off State	200 V
Current - On State (It (RMS))	55 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	40 mA
Voltage - On State (Vtm) (Max)	1.8 V
Current - On State (It (AV)) (Max)	35 A
Current - Hold (Ih) (Max)	60 mA
Current - Off State (Max)	10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	550A, 650A
SCR Type	Standard Recovery
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the S2055RTP are selected based on electrical and mechanical compatibility within the following criteria:

Maintained Parameters (Must Match):

SCR Type: Standard Recovery
Current - On State (It (RMS)): 55 A
Voltage - Gate Trigger (Vgt) (Max): 1.5 V
Current - Gate Trigger (Igt) (Max): 40 mA
Voltage - On State (Vtm) (Max): 1.8 V
Current - On State (It (AV)) (Max): 35 A
Current - Hold (Ih) (Max): 60 mA
Current - Off State (Max): 10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm): 550A, 650A
Operating Temperature: -40°C ~ 125°C
Mounting Type: Through Hole
Package / Case: TO-220-3

Variable Parameter (Allows Substitution):

Voltage - Off State: Can be equal or higher than 200V

The S4055RTP and S6055RTP are qualified substitutes because they maintain all electrical characteristics while offering higher voltage ratings (400V and 600V respectively), providing enhanced voltage margin for circuit protection. Both substitute parts are in active product status with current manufacturing availability.

Parameter Comparison

Parameter	S2055RTP	S4055RTP	S6055RTP
Voltage - Off State	200 V	400 V	600 V
Current - On State (It (RMS))	55 A	55 A	55 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	1.5 V
Current - Gate Trigger (Igt) (Max)	40 mA	40 mA	40 mA
Voltage - On State (Vtm) (Max)	1.8 V	1.8 V	1.8 V
Current - On State (It (AV)) (Max)	35 A	35 A	35 A
Current - Hold (Ih) (Max)	60 mA	60 mA	60 mA
Current - Off State (Max)	10 µA	10 µA	10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	550A, 650A	550A, 650A	550A, 650A
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

S4055RTP (400V Rating): This substitute provides a 2x voltage margin over the original S2055RTP while maintaining identical current and thermal characteristics. The S4055RTP is in active production status with ROHS3 compliance and REACH unaffected designation, ensuring long-term supply availability and regulatory compliance for new designs.

S6055RTP (600V Rating): This substitute provides a 3x voltage margin over the original S2055RTP. The S6055RTP is in active production status with ROHS3 compliance and REACH unaffected designation. This option is suitable for applications requiring maximum voltage headroom or where circuit voltage stress margins must be optimized.

Both substitutes are electrically and mechanically compatible with the S2055RTP in TO-220-3 through-hole applications. Selection between S4055RTP and S6055RTP depends on circuit voltage requirements and design margin specifications.

Frequently Asked Questions (FAQ)

Q: Can S4055RTP or S6055RTP be used as direct replacements for S2055RTP?

A: Yes. Both parts maintain identical gate trigger voltage, on-state voltage, holding current, and surge current specifications. The higher off-state voltage ratings (400V and 600V) are compatible with 200V circuit applications and provide additional voltage margin.

Q: What is the difference between S4055RTP and S6055RTP?

A: Both parts are functionally equivalent with identical current and thermal ratings. The primary difference is off-state voltage rating: S4055RTP is rated 400V and S6055RTP is rated 600V. Selection depends on circuit voltage requirements and desired voltage safety margin.

Q: Are the substitute parts available in the same package?

A: Yes. All three parts use the TO-220-3 through-hole package with identical mechanical dimensions and pin configuration, enabling direct PCB compatibility.

Q: Why is the S2055RTP obsolete?

A: The S2055RTP is classified as obsolete by the manufacturer. The S4055RTP and S6055RTP represent the active product line continuation with enhanced voltage ratings and current manufacturing support.

Q: Do the substitute parts have the same compliance certifications?

A: Yes. Both S4055RTP and S6055RTP are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original S2055RTP.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message