S8055M Equivalent & Substitute Parts

Part Overview

The S8055M is a Silicon Controlled Rectifier (SCR) rated for 800V off-state voltage with 55A RMS on-state current capability. Manufactured by Littelfuse Inc., this component is designed for high-voltage switching applications in industrial and power conversion circuits. The S8055M is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. The S8055MTP serves as the direct active substitute, maintaining identical electrical specifications while offering current availability.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	800	V
Current - On State (It (RMS))	55	A
Current - On State (It (AV))	35	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 - Hold (Ih) (Max)	60	mA
Current - Off State (Max)	20	µA
Current - Non Rep. Surge (50/60Hz)	550A / 650A	A
Operating Temperature Range	-40 to 125	°C
SCR Type	Standard Recovery	—
Mounting Type	Through Hole	—
Package / Case	TO-218-3, TO-218AC	—

Substitute Part Grouping Explanation

The S8055MTP qualifies as a direct substitute for the S8055M based on strict electrical and mechanical parameter equivalence. Substitution criteria are determined by the following parameters:

Off-state voltage rating (800V)
RMS on-state current capacity (55A)
Gate trigger voltage and current thresholds (Vgt ≤ 1.5V, Igt ≤ 40mA)
On-state voltage drop (Vtm ≤ 1.8V)
Hold current requirement (Ih ≤ 60mA)
SCR recovery type (Standard Recovery)
Thermal operating range (-40°C to 125°C)
Physical package form factor (TO-218-3, TO-218AC)

The S8055MTP maintains identical specifications across all electrical parameters and package configuration, with the primary distinction being product status (Active vs. Obsolete) and packaging format (Tube vs. unspecified for the original part).

Parameter Comparison

Parameter	S8055M	S8055MTP	Match
Voltage - Off State	800 V	800 V	✓
Current - On State (It (RMS))	55 A	55 A	✓
Current - On State (It (AV))	35 A	35 A	✓
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	✓
Current - Gate Trigger (Igt) (Max)	40 mA	40 mA	✓
Voltage - On State (Vtm) (Max)	1.8 V	1.8 V	✓
Current - Hold (Ih) (Max)	60 mA	60 mA	✓
Current - Off State (Max)	20 µA	20 µA	✓
Current - Non Rep. Surge (50/60Hz)	550A / 650A	550A / 650A	✓
Operating Temperature Range	-40 to 125°C	-40 to 125°C	✓
SCR Type	Standard Recovery	Standard Recovery	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-218-3, TO-218AC	TO-218-3, TO-218AC	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	✓
ECCN	EAR99	EAR99	✓
HTSUS	8541.30.0080	8541.30.0080	✓

Engineering Selection Recommendations

The S8055MTP is the appropriate selection for applications currently using or specifying the S8055M. Both components are manufactured by Littelfuse Inc. and carry identical electrical and mechanical specifications. The S8055MTP holds Active product status, ensuring long-term availability and manufacturing support, whereas the S8055M is classified as Obsolete. Both parts maintain ROHS3 compliance and carry identical regulatory classifications (EAR99, HTSUS 8541.30.0080), confirming suitability for equivalent circuit implementation. The S8055MTP is supplied in Tube packaging format, which is standard for production procurement of through-hole thyristors.

Frequently Asked Questions (FAQ)

Q: Can the S8055MTP directly replace the S8055M in existing designs?

A: Yes. The S8055MTP is electrically and mechanically identical to the S8055M across all specified parameters, including voltage ratings, current ratings, gate trigger characteristics, thermal range, and package form factor. Direct substitution is supported without circuit modification.

Q: What is the primary reason for substitution?

A: The S8055M is classified as Obsolete. The S8055MTP is the active equivalent part, ensuring continued availability and manufacturing support for new production and field replacement applications.

Q: Are there any compliance or certification differences?

A: No. Both the S8055M and S8055MTP carry identical RoHS3 compliance status, Moisture Sensitivity Level (MSL 1), and regulatory classifications (EAR99, HTSUS 8541.30.0080).

Q: What is the difference in packaging between these parts?

A: The S8055MTP is supplied in Tube packaging, which is the standard format for production quantities of through-hole thyristors. Both parts use the TO-218-3 and TO-218AC package form factors, ensuring identical PCB footprint and mounting compatibility.

Q: Are the electrical characteristics guaranteed to be identical?

A: Yes. All electrical parameters—including off-state voltage (800V), RMS on-state current (55A), gate trigger voltage (1.5V max), gate trigger current (40mA max), on-state voltage drop (1.8V max), hold current (60mA max), and surge current ratings (550A/650A)—are identical between the two parts.

Q: Can the S8055MTP be used in high-temperature applications?

A: Yes. The S8055MTP operates across the full temperature range of -40°C to 125°C, matching the S8055M specification and supporting industrial and automotive thermal environments.

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