S2SRP Equivalent & Substitute Parts

Part Overview

The S2SRP is a sensitive gate SCR (silicon controlled rectifier) rated for 200V off-state voltage with 800mA RMS current capability in a surface mount DO-214AA (Compak) package. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The S2SRP maintains compatibility with active alternatives that preserve the core electrical characteristics while offering higher voltage ratings and improved availability.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the S2SRP is determined by maintaining electrical and mechanical compatibility across the following critical parameters:

SCR Type classification (Sensitive Gate)
Gate trigger voltage and current specifications (Vgt Max 800 mV, Igt Max 200 µA)
On-state voltage and current ratings (Vtm Max 1.7 V, It (RMS) Max 800 mA)
Hold current specification (Ih Max 5 mA)
Operating temperature range (-40°C to 110°C)
Surface mount package format (DO-214AA Compak)

The substitute parts S4SRP and S6SRP are qualified alternatives because they maintain identical gate trigger specifications, on-state characteristics, hold current, temperature range, and package configuration. The primary difference is elevated off-state voltage rating, which represents an upgrade path rather than a functional deviation. Both substitutes are active products with ROHS3 compliance and superior inventory availability.

Parameter Comparison

Parameter	S2SRP	S4SRP	S6SRP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Category	Thyristors	Thyristors	Thyristors
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)	200 µA	200 µA	200 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
Current - Non Rep. Surge 50, 60Hz (Itsm)	16A, 20A	16A, 20A	16A, 20A
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate
Operating Temperature	-40°C to 110°C	-40°C to 110°C	-40°C to 110°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB (3 Leads), Compak	DO-214AA, SMB (3 Leads), Compak	DO-214AA, SMB (3 Leads), Compak
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

The S2SRP is obsolete and should be replaced with either S4SRP or S6SRP for new designs and ongoing procurement. Both substitutes are active products with ROHS3 compliance and established supply chains.

Selection between S4SRP and S6SRP depends on circuit voltage requirements. The S4SRP provides 400V off-state rating and is suitable for applications requiring voltage headroom up to 400V. The S6SRP provides 600V off-state rating and is appropriate for higher voltage applications. Both parts maintain identical gate trigger characteristics, on-state performance, and thermal specifications as the original S2SRP.

The S6SRP carries REACH Affected status, while the S4SRP carries REACH Unaffected status. This distinction may influence material compliance documentation requirements depending on end-use jurisdiction and customer specifications.

Frequently Asked Questions (FAQ)

Q: Can S4SRP or S6SRP be used as direct replacements for S2SRP in existing designs?

A: Yes, both S4SRP and S6SRP are direct functional replacements. They maintain identical gate trigger voltage and current specifications, on-state voltage and current ratings, hold current, operating temperature range, and surface mount package configuration. The higher off-state voltage ratings represent an upgrade that does not compromise compatibility.

Q: What is the difference between S4SRP and S6SRP?

A: The primary difference is off-state voltage rating. S4SRP is rated for 400V off-state voltage, while S6SRP is rated for 600V off-state voltage. All other electrical characteristics and package specifications are identical. Selection should be based on the maximum voltage the circuit will experience.

Q: Are the packages identical between S2SRP, S4SRP, and S6SRP?

A: Yes. All three parts use the DO-214AA surface mount package in Compak configuration with 3 leads. Pin-to-pin compatibility is maintained across all three part numbers.

Q: What is the inventory status of these parts?

A: S2SRP is obsolete with 954 pieces in stock. S4SRP is active with 7,600 pieces in stock. S6SRP is active with 14,905 pieces in stock. For new procurement, S4SRP and S6SRP offer superior availability.

Q: Are there compliance differences between these parts?

A: All three parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. S4SRP carries REACH Unaffected status, while S6SRP carries REACH Affected status. Verify REACH compliance requirements for your specific application and jurisdiction.

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