Equivalent & Substitute Parts for Littelfuse C106DG (SCR 400V 4A TO225AA)

Part Overview

The Littelfuse C106DG is a sensitive-gate silicon-controlled rectifier (SCR) rated for 400 V, 4 A, housed in a TO-225AA through-hole package. This device is active and compliant with ROHS3 and REACH regulations. When component shortages, discontinuations, or supply chain constraints occur, it is necessary to identify equivalent SCR thyristors that precisely match the specified electrical and mechanical parameters to maintain system reliability and compliance.

Key Parameters

Parameter	Value
Category	Thyristors
SCR Type	Sensitive Gate
Voltage - Off State	400 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA
Voltage - On State (Vtm) (Max)	2.2 V
Current - On State (It (AV)) (Max)	2.55 A
Current - On State (It (RMS)) (Max)	4 A
Current - Hold (Ih) (Max)	3 mA
Current - Off State (Max)	10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	20A @ 60Hz
Operating Temperature	-40°C ~ 110°C
Mounting Type	Through Hole
Package / Case	TO-225AA, TO-126-3
Supplier Device Package	TO-225AA
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8541.30.0080

Substitute Part Grouping Explanation

Substitute identification for the Littelfuse C106DG SCR is based strictly on matching the following key parameters: device category (thyristors), SCR type (sensitive gate), voltage and current ratings, gate trigger specifications, surge capability, operating temperature range, compliance certifications, mounting type, and package compatibility. Only parts conforming to the combination of these electrical and mechanical attributes qualify as direct substitutes.

Parameter Comparison

Parameter	C106DG (Main)	S4004VS2TP (MFR Recommended)	C106D1G (Parametric Equivalent)
Category	Thyristors	Thyristors	Thyristors
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate
Voltage - Off State	400 V	400 V	400 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA	200 µA	200 µA
Voltage - On State (Vtm) (Max)	2.2 V	1.6 V	2.2 V
Current - On State (It (AV)) (Max)	2.55 A	2.5 A	2.55 A
Current - On State (It (RMS)) (Max)	4 A	4 A	4 A
Current - Hold (Ih) (Max)	3 mA	6 mA	3 mA
Current - Off State (Max)	10 µA	2 µA	10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	20A @ 60Hz	25A, 30A	20A @ 60Hz
Operating Temperature	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All listed SCR thyristor substitutes for C106DG are active, ROHS3 compliant, REACH unaffected, and have a Moisture Sensitivity Level of 1 (Unlimited). Each part aligns with the specified regulatory, compliance, and operational status parameters required for direct engineering selection.

Frequently Asked Questions (FAQ)

Q1: What are the critical substitution criteria for replacing C106DG SCR thyristors?
A1: Substitute parts must match the SCR type (sensitive gate), voltage and current specifications, mounting type, package/case compatibility, and possess equivalent regulatory compliance status.

Q2: Are the package and mounting styles identical across all substitutes?
A2: C106DG and C106D1G share the TO-225AA package and through-hole mounting, ensuring mechanical interchangeability. S4004VS2TP uses the TO-251AA through-hole package, which requires mechanical compatibility verification based on the specified input.

Q3: Do all substitutes maintain compliance with ROHS3 and REACH standards?
A3: All compared parts are ROHS3 compliant and REACH unaffected, satisfying environmental and safety requirements.

Q4: Are substitute parts active and available for immediate use?
A4: Each listed substitute is designated as active and available in inventory according to the provided input.

Q5: What electrical characteristics must match for successful substitution?
A5: Key electrical characteristics for substitution include voltage and current ratings, gate trigger levels, surge current capability, and operating temperature range. Each substitute aligns with these requirements per the supplied data.

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