S2040NRP Equivalent & Substitute Parts

Part Overview

The S2040NRP is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage with 40A RMS current capacity in a Surface Mount TO-263 (D2PAK) package. Manufactured by Littelfuse Inc., this component is classified as Obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The S2040NRP serves in applications requiring standard recovery thyristor functionality within its specified voltage and current parameters.

Key Parameters

Parameter	Value
Voltage - Off State	200 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	40 mA
Voltage - On State (Vtm) (Max)	1.8 V
Current - On State (It (RMS)) (Max)	40 A
Current - Hold (Ih) (Max)	60 mA
Current - Off State (Max)	10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	430A, 520A
SCR Type	Standard Recovery
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the S2040NRP are selected based on compatibility across the following critical parameters:

Mandatory Compatibility Criteria:

SCR Type: Standard Recovery
Mounting Type: Surface Mount
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Gate Trigger Voltage (Vgt) (Max): 1.5 V
Gate Trigger Current (Igt) (Max): 40 mA
On-State Voltage (Vtm) (Max): 1.8 V
On-State Current (It (RMS)) (Max): 40 A
Hold Current (Ih) (Max): 60 mA
Off-State Current (Max): 10 µA
Operating Temperature Range: -40°C ~ 125°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Variable Parameter (Allows Substitution):

Voltage - Off State: The S2040NRP operates at 200V. Substitute parts with higher voltage ratings (400V, 600V) are electrically compatible in applications where the circuit voltage does not exceed the substitute part's rating. Higher voltage-rated SCRs maintain all other electrical characteristics while providing enhanced voltage margin.

Parameter Comparison

Parameter	S2040NRP (Main)	S4040NRP (Substitute)	S6040NRP (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Voltage - Off State	200 V	400 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	1.5 V
Current - Gate Trigger (Igt) (Max)	40 mA	40 mA	40 mA
Voltage - On State (Vtm) (Max)	1.8 V	1.8 V	1.8 V
Current - On State (It (AV)) (Max)	25 A	25 A	25 A
Current - On State (It (RMS)) (Max)	40 A	40 A	40 A
Current - Hold (Ih) (Max)	60 mA	60 mA	60 mA
Current - Off State (Max)	10 µA	10 µA	10 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	430A, 520A	430A, 520A	430A, 520A
SCR Type	Standard Recovery	Standard Recovery	Standard Recovery
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
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

S4040NRP (400V Rating): This substitute part is classified as Active and maintains full electrical and mechanical compatibility with the S2040NRP. The 400V off-state voltage rating provides a 2:1 voltage margin over the original 200V specification. Selection is appropriate for applications operating at or below 200V where component availability and long-term supply continuity are priorities.

S6040NRP (600V Rating): This substitute part is classified as Active and maintains full electrical and mechanical compatibility with the S2040NRP. The 600V off-state voltage rating provides a 3:1 voltage margin over the original 200V specification. Selection is appropriate for applications operating at or below 200V where maximum voltage headroom and extended product lifecycle support are required.

Both substitute parts carry ROHS3 compliance and MSL Level 1 ratings identical to the original part, ensuring regulatory and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can S4040NRP or S6040NRP be used as direct replacements for S2040NRP in existing designs?

A: Yes, both substitute parts are electrically and mechanically compatible. All gate trigger parameters, on-state characteristics, hold current, and thermal specifications are identical. The higher voltage ratings do not affect circuit operation in applications designed for 200V operation.

Q: What is the advantage of selecting a higher voltage-rated SCR?

A: Higher voltage ratings provide increased voltage margin and protection against transient overvoltages. The S4040NRP and S6040NRP offer 2:1 and 3:1 voltage margins respectively over the original 200V design specification.

Q: Are there packaging differences between the main part and substitutes?

A: No. All three parts use identical Surface Mount TO-263-3 (D2PAK) packaging with 2 leads plus tab configuration. PCB layout and thermal management considerations remain unchanged.

Q: Why is the S2040NRP classified as Obsolete?

A: The S2040NRP is no longer in active production. The S4040NRP and S6040NRP are active alternatives that provide equivalent functionality with enhanced voltage ratings and assured long-term availability.

Q: Are there compliance or certification differences?

A: No. All three parts are ROHS3 compliant with MSL Level 1 moisture sensitivity ratings. Regulatory and environmental compliance is identical across the product group.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel packaging is supplied on continuous reels for automated assembly equipment. Both formats contain identical components; packaging format selection depends on production volume and assembly methodology.

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