S2S2RP Equivalent & Substitute Parts

Part Overview

The S2S2RP is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 200V off-state voltage with 800mA RMS current capacity in a surface mount DO-214AA (Compak) package, manufactured by Littelfuse Inc. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The S2S2RP maintains consistent gate trigger characteristics and thermal operating range across its electrical specifications, establishing a foundation for identifying compatible alternatives with higher voltage ratings.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	200	V
Voltage - Gate Trigger (Vgt) (Max)	800	mV
Current - Gate Trigger (Igt) (Max)	50	µA
Voltage - On State (Vtm) (Max)	1.7	V
Current - On State (It (RMS)) (Max)	800	mA
Current - Hold (Ih) (Max)	5	mA
Current - Off State (Max)	1	µA
Operating Temperature Range	-40 to 110	°C
Package / Case	DO-214AA, SMB (3 Leads), Compak	-
SCR Type	Sensitive Gate	-
Mounting Type	Surface Mount	-

Substitute Part Grouping Explanation

Substitution of the S2S2RP is determined by maintaining identical electrical and mechanical parameters across the following criteria:

Fixed Parameters (Must Match Exactly):

SCR Type: Sensitive Gate
Voltage - Gate Trigger (Vgt) (Max): 800 mV
Current - Gate Trigger (Igt) (Max): 50 µA
Voltage - On State (Vtm) (Max): 1.7 V
Current - On State (It (RMS)) (Max): 800 mA
Current - Hold (Ih) (Max): 5 mA
Current - Off State (Max): 1 µA
Operating Temperature Range: -40°C to 110°C
Package / Case: DO-214AA, SMB (3 Leads), Compak
Mounting Type: Surface Mount

Variable Parameter (Allows Substitution):

Voltage - Off State: 200V, 400V, or 600V

The S4S2RP and S6S2RP are qualified substitutes because they maintain all fixed electrical and mechanical parameters while offering higher off-state voltage ratings. This voltage elevation provides enhanced overvoltage margin in applications where the original 200V rating may be insufficient, while preserving gate trigger behavior, on-state characteristics, and thermal performance.

Parameter Comparison

Parameter	S2S2RP	S4S2RP	S6S2RP	Unit
Voltage - Off State	200	400	600	V
Voltage - Gate Trigger (Vgt) (Max)	800	800	800	mV
Current - Gate Trigger (Igt) (Max)	50	50	50	µA
Voltage - On State (Vtm) (Max)	1.7	1.7	1.7	V
Current - On State (It (RMS)) (Max)	800	800	800	mA
Current - Hold (Ih) (Max)	5	5	5	mA
Current - Off State (Max)	1	1	1	µA
Operating Temperature Range	-40 to 110	-40 to 110	-40 to 110	°C
Package / Case	DO-214AA, SMB (3 Leads), Compak	DO-214AA, SMB (3 Leads), Compak	DO-214AA, SMB (3 Leads), Compak	-
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	-
Mounting Type	Surface Mount	Surface Mount	Surface Mount	-
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

S4S2RP (400V Rating): This substitute provides a 2x voltage margin over the original S2S2RP while maintaining all electrical and thermal characteristics. The S4S2RP is in active product status with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term availability and regulatory alignment. Selection is appropriate for applications requiring moderate overvoltage protection without redesign.

S6S2RP (600V Rating): This substitute provides a 3x voltage margin over the original S2S2RP and is similarly maintained in active product status with ROHS3 compliance and unlimited moisture sensitivity rating. The S6S2RP is suitable for applications with higher transient voltage exposure or where maximum voltage headroom is required within the Compak package form factor.

Both substitutes are manufactured by Littelfuse Inc. and share identical gate trigger, on-state, and thermal specifications with the obsolete S2S2RP, enabling direct functional replacement in surface mount applications without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the S4S2RP or S6S2RP be used as direct replacements for the S2S2RP in existing designs?

A: Yes. Both substitutes maintain identical gate trigger voltage (800 mV max), gate trigger current (50 µA max), on-state voltage (1.7 V max), RMS current rating (800 mA), hold current (5 mA max), and operating temperature range (-40°C to 110°C). The physical package (DO-214AA Compak) and pin configuration are identical, enabling direct PCB substitution.

Q: What is the primary difference between the S2S2RP, S4S2RP, and S6S2RP?

A: The off-state voltage rating is the only electrical difference. The S2S2RP is rated for 200V, the S4S2RP for 400V, and the S6S2RP for 600V. All other electrical and mechanical parameters are identical.

Q: Why would I select the S4S2RP or S6S2RP over the S2S2RP?

A: The S2S2RP is obsolete, making the S4S2RP and S6S2RP necessary for new production and ongoing supply. Additionally, the higher voltage ratings provide increased overvoltage margin in applications subject to transient voltage spikes or where circuit design requires additional voltage headroom.

Q: Are there any compliance or regulatory differences between these parts?

A: All three parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. The S4S2RP and S6S2RP carry REACH Affected status, which is not specified for the obsolete S2S2RP.

Q: Can I use the S6S2RP in a circuit designed for the S2S2RP without any modifications?

A: Yes. The S6S2RP is electrically and mechanically compatible with the S2S2RP. The higher voltage rating does not affect gate trigger behavior, on-state performance, or thermal characteristics. No circuit modifications are required.

Q: What is the packaging difference between these parts?

A: The S2S2RP is listed as obsolete with unspecified packaging. The S4S2RP and S6S2RP are supplied in Tape & Reel (TR) format. All three use the identical DO-214AA (Compak) physical package for surface mount assembly.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message