S2055M Equivalent & Substitute Parts

Part Overview

The S2055M is a Silicon Controlled Rectifier (SCR) manufactured by Littelfuse Inc., rated for 200V off-state voltage and 55A RMS on-state current in a TO-218 through-hole package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The S2055M operates across a temperature range of -40°C to 125°C and complies with ROHS3 standards.

Key Parameters

Parameter	S2055M Value
Voltage - Off State	200 V
Current - On State (It (RMS))	55 A
Voltage - On State (Vtm) (Max)	1.8 V
Current - Gate Trigger (Igt) (Max)	40 mA
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Hold (Ih) (Max)	60 mA
Operating Temperature Range	-40°C to 125°C
SCR Type	Standard Recovery
Mounting Type	Through Hole
Package / Case	TO-218-3, TO-218AC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of thyristor components is determined by electrical compatibility within defined parameter ranges and mechanical compatibility with mounting and packaging requirements. The BTW69-600RG qualifies as a substitute based on the following criteria:

Electrical Compatibility Parameters:

SCR Type: Both components are Standard Recovery thyristors
Operating Temperature Range: Both support -40°C to 125°C
Gate Trigger Voltage (Vgt): BTW69-600RG at 1.3V (Max) is within acceptable tolerance relative to S2055M at 1.5V (Max)
Gate Trigger Current (Igt): BTW69-600RG at 80 mA (Max) exceeds S2055M at 40 mA (Max), providing margin
On-State Voltage (Vtm): BTW69-600RG at 1.9V (Max) is comparable to S2055M at 1.8V (Max)
Hold Current (Ih): BTW69-600RG at 150 mA (Max) exceeds S2055M at 60 mA (Max)
Off-State Current: Both rated at 10 µA (Max)

Mechanical Compatibility:

Both components feature through-hole mounting
Package transition from TO-218 to TOP-3 requires PCB layout verification

Compliance:

Both components are ROHS3 compliant
Both carry EAR99 ECCN classification

Parameter Comparison

Parameter	S2055M	BTW69-600RG
Manufacturer	Littelfuse Inc.	STMicroelectronics
Voltage - Off State	200 V	600 V
Current - On State (It (RMS))	55 A	50 A
Voltage - On State (Vtm) (Max)	1.8 V	1.9 V
Current - Gate Trigger (Igt) (Max)	40 mA	80 mA
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.3 V
Current - Hold (Ih) (Max)	60 mA	150 mA
Current - Off State (Max)	10 µA	10 µA
SCR Type	Standard Recovery	Standard Recovery
Operating Temperature	-40°C to 125°C	-40°C to 125°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-218-3, TO-218AC	TOP-3
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The BTW69-600RG is an active product from STMicroelectronics and represents a viable substitute for the obsolete S2055M. Both components maintain ROHS3 compliance and identical operating temperature specifications. The BTW69-600RG provides higher off-state voltage rating (600V versus 200V), which offers additional design margin in applications where voltage transients may occur. The RMS current rating of the BTW69-600RG (50A) is slightly lower than the S2055M (55A), requiring verification that application current demands do not exceed 50A RMS. Package transition from TO-218 to TOP-3 necessitates PCB footprint modification and thermal management reassessment due to different lead configurations and heat dissipation characteristics.

Frequently Asked Questions (FAQ)

Q: Can the BTW69-600RG directly replace the S2055M without PCB modifications?

A: No. The BTW69-600RG uses a TOP-3 package while the S2055M uses TO-218. PCB footprint, lead spacing, and mounting hole positions differ. Physical layout redesign is required.

Q: What is the significance of the higher voltage rating on the BTW69-600RG?

A: The BTW69-600RG is rated for 600V off-state voltage compared to the S2055M at 200V. This higher rating provides additional margin against voltage transients and overvoltage conditions. Applications operating at or near 200V must verify that transient voltages do not exceed the S2055M rating.

Q: Is the lower RMS current rating of the BTW69-600RG a limitation?

A: The BTW69-600RG is rated for 50A RMS versus the S2055M at 55A RMS. Applications requiring sustained currents above 50A RMS cannot use the BTW69-600RG. Verify actual application current requirements before substitution.

Q: Are gate drive requirements compatible between these components?

A: Gate trigger voltage and current specifications differ slightly. The BTW69-600RG requires 1.3V (Max) gate trigger voltage and 80 mA (Max) gate trigger current, compared to the S2055M at 1.5V and 40 mA respectively. Existing gate drive circuits must be evaluated for compatibility with the BTW69-600RG specifications.

Q: Do both components meet the same compliance standards?

A: Yes. Both the S2055M and BTW69-600RG are ROHS3 compliant with EAR99 ECCN classification. Compliance requirements are equivalent.

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