S2S1RP Equivalent & Substitute Parts

Part Overview

The S2S1RP is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 200 V off-state voltage with 800 mA RMS on-state current, manufactured by Littelfuse Inc. in a surface mount DO-214AA (Compak) package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The S2S1RP maintains full compatibility with higher voltage-rated alternatives from the same manufacturer that share identical electrical characteristics across gate trigger parameters, on-state voltage drop, and thermal operating range.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	200	V
Voltage - Gate Trigger (Vgt) (Max)	800	mV
Current - Gate Trigger (Igt) (Max)	12	µA
Voltage - On State (Vtm) (Max)	1.7	V
Current - On State (It (RMS)) (Max)	800	mA
Current - Hold (Ih) (Max)	5	mA
Operating Temperature Range	-40 to 110	°C
Package / Case	DO-214AA, SMB (3 Leads), Compak	-
Mounting Type	Surface Mount	-
SCR Type	Sensitive Gate	-

Substitute Part Grouping Explanation

Substitute parts for the S2S1RP are qualified based on the following criteria:

Electrical Parameter Compatibility:

Gate trigger voltage (Vgt): 800 mV maximum (identical across all parts)
Gate trigger current (Igt): 12 µA maximum (identical across all parts)
On-state voltage drop (Vtm): 1.7 V maximum (identical across all parts)
On-state RMS current (It (RMS)): 800 mA maximum (identical across all parts)
Hold current (Ih): 5 mA maximum (identical across all parts)
Operating temperature range: -40°C to 110°C (identical across all parts)

Mechanical Compatibility:

Package type: DO-214AA, SMB (3 Leads), Compak (identical across all parts)
Mounting type: Surface Mount (identical across all parts)
SCR type: Sensitive Gate (identical across all parts)

Voltage Rating Variation: The S4S1RP and S6S1RP provide higher off-state voltage ratings (400 V and 600 V respectively) while maintaining all other electrical and mechanical specifications. These parts are direct substitutes for applications where the 200 V rating of the S2S1RP is sufficient, as higher voltage-rated components operate identically at lower applied voltages.

Parameter Comparison

Parameter	S2S1RP	S4S1RP	S6S1RP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Voltage - Off State	200 V	400 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	12 µA	12 µA	12 µA
Voltage - On State (Vtm) (Max)	1.7 V	1.7 V	1.7 V
Current - On State (It (RMS)) (Max)	800 mA	800 mA	800 mA
Current - Hold (Ih) (Max)	5 mA	5 mA	5 mA
Current - Off State (Max)	1 µA	1 µA	1 µA
Operating Temperature	-40 to 110°C	-40 to 110°C	-40 to 110°C
Package / Case	DO-214AA, SMB (3 Leads), Compak	DO-214AA, SMB (3 Leads), Compak	DO-214AA, SMB (3 Leads), Compak
Mounting Type	Surface Mount	Surface Mount	Surface Mount
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

S4S1RP (400 V Rating): This part is actively manufactured and maintains full electrical and mechanical compatibility with the S2S1RP. The 400 V off-state voltage rating provides increased design margin for applications operating below 200 V. Product status is Active with ROHS3 compliance and MSL 1 rating.

S6S1RP (600 V Rating): This part is actively manufactured and provides the highest voltage rating among available substitutes. The 600 V off-state voltage rating offers maximum design margin for voltage transient protection. Product status is Active with ROHS3 compliance and MSL 1 rating.

Both substitute parts are suitable for direct replacement in applications where the S2S1RP was originally specified, provided the circuit design accommodates the higher voltage ratings.

Frequently Asked Questions (FAQ)

Q: Can S4S1RP or S6S1RP be used as direct replacements for S2S1RP?

A: Yes. Both substitute parts maintain identical gate trigger parameters (800 mV, 12 µA), on-state characteristics (1.7 V, 800 mA), hold current (5 mA), and operating temperature range (-40°C to 110°C). The package, mounting type, and SCR type are identical. The higher voltage ratings do not affect operation at lower applied voltages.

Q: What is the difference between the three parts?

A: The primary difference is the off-state voltage rating: S2S1RP is rated for 200 V, S4S1RP for 400 V, and S6S1RP for 600 V. All other electrical and mechanical specifications are identical.

Q: Why is the S2S1RP classified as obsolete?

A: The S2S1RP is listed as obsolete by the manufacturer. The S4S1RP and S6S1RP are active products that provide equivalent functionality with higher voltage ratings.

Q: Are there any compliance differences between these parts?

A: All three parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. Both substitute parts carry the same ECCN (EAR99) and HTSUS (8541.30.0080) classifications as the original part.

Q: Which substitute should be selected for new designs?

A: Selection depends on the circuit's maximum applied voltage. For applications operating below 200 V, either S4S1RP or S6S1RP can be used. The S4S1RP provides adequate margin for most applications, while S6S1RP offers maximum transient protection.

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