SJ4020NARP Equivalent & Substitute Parts

Part Overview

The SJ4020NARP is a silicon-controlled rectifier (SCR) manufactured by Littelfuse Inc., classified as a Standard Recovery thyristor in the SJ series. This component is rated for 600 V off-state voltage and 20 A RMS on-state current in a surface mount TO-263 (D2PAK) package. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or application-specific current rating adjustments.

Substiute Parts

SJ4020NARP

Littelfuse Inc.In Stock: 1130SJ4020NARP Datasheet

Current PartRFQ

SJ6020NRP

LittelfuseIn Stock: 1276SJ6020NRP Datasheet

Parametric EquivalentRFQ

SJ6025NRP

Littelfuse Inc.In Stock: 1116SJ6025NRP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SJ4020NARP are qualified based on the following criteria:

Electrical Equivalence Parameters:

• Off-state voltage rating: 600 V (identical)
• Gate trigger voltage (Vgt Max): 1.5 V (identical)
• Gate trigger current (Igt Max): 35 mA (identical)
• On-state voltage (Vtm Max): 1.6 V (identical)
• Hold current (Ih Max): 75 mA (identical)
• Off-state leakage current (Max): 10 µA (identical)
• Operating temperature range: -40°C to 150°C (identical)
• SCR type: Standard Recovery (identical)

Mechanical Compatibility Parameters:

• Package / Case: TO-263-3, D2PAK (identical)
• Mounting type: Surface Mount (identical)
• Supplier device package: TO-263 (D2PAK) (identical)

Compliance Parameters:

• RoHS Status: ROHS3 Compliant (identical)
• MSL Rating: 1 (Unlimited) (identical)
• ECCN: EAR99 (identical)

Substitutes are differentiated by on-state current ratings (It RMS Max and It AV Max), which determine application suitability for higher current demands while maintaining all other electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

SJ6020NRP Selection Criteria: The SJ6020NRP is a direct parametric equivalent to the SJ4020NARP. All electrical characteristics, gate trigger parameters, on-state voltage, hold current, and leakage current specifications are identical. The on-state current rating (It RMS Max: 20 A) matches the main part exactly. This substitute is suitable for applications requiring identical performance specifications with no design modifications. Both parts maintain Active product status, ROHS3 compliance, and unlimited MSL rating. Selection of SJ6020NRP is appropriate when inventory availability of the SJ4020NARP is constrained.

SJ6025NRP Selection Criteria: The SJ6025NRP is a higher current-rated variant within the same SJ series family. All gate trigger, on-state voltage, hold current, and leakage current parameters remain identical to the SJ4020NARP. The primary difference is the increased on-state current rating (It RMS Max: 25 A versus 20 A) and corresponding surge current capability (300 A and 350 A at 50 Hz and 60 Hz respectively, versus 225 A and 300 A). This part is suitable for applications requiring higher current handling capacity while maintaining identical voltage ratings, trigger characteristics, and thermal operating range. The SJ6025NRP is electrically and mechanically compatible with SJ4020NARP designs and maintains full ROHS3 compliance and unlimited MSL rating.

All three parts are manufactured by Littelfuse Inc., classified as Active products, and supplied in identical TO-263 (D2PAK) surface mount packages with Tape & Reel packaging.

Frequently Asked Questions (FAQ)

Q: Can SJ6020NRP be used as a direct replacement for SJ4020NARP?

A: Yes. The SJ6020NRP is a direct parametric equivalent. All electrical specifications including off-state voltage (600 V), gate trigger voltage (1.5 V max), gate trigger current (35 mA max), on-state voltage (1.6 V max), on-state current (20 A RMS max), hold current (75 mA max), and operating temperature range (-40°C to 150°C) are identical. The package, mounting type, and compliance certifications are also identical. No design modifications are required.

Q: What is the primary difference between SJ4020NARP and SJ6025NRP?

A: The primary difference is the on-state current rating. The SJ6025NRP is rated for 25 A RMS maximum on-state current compared to 20 A RMS for the SJ4020NARP. The SJ6025NRP also has higher non-repetitive surge current capability (300 A and 350 A at 50 Hz and 60 Hz respectively, versus 225 A and 300 A). All other electrical parameters, including voltage ratings, gate trigger characteristics, and thermal range, are identical. Both parts use the same TO-263 (D2PAK) package.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts (SJ4020NARP, SJ6020NRP, and SJ6025NRP) use identical TO-263-3 (D2PAK) packages with 2 leads plus tab configuration. They are mechanically and electrically compatible for surface mount assembly on the same PCB layout without modifications.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. All three parts are ROHS3 compliant, carry MSL rating 1 (Unlimited), and share identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications. Compliance certifications are equivalent across all parts.

Q: When should SJ6025NRP be selected over SJ4020NARP?

A: The SJ6025NRP should be selected when the application requires higher on-state current handling (25 A RMS versus 20 A RMS) or higher surge current capability. If the application current requirements do not exceed 20 A RMS, the SJ4020NARP or SJ6020NRP are appropriate selections. The choice between these parts is determined by actual circuit current demands, not by design preference.

Q: Are gate trigger parameters identical across all three parts?

A: Yes. All three parts share identical gate trigger specifications: Vgt (Max) 1.5 V and Igt (Max) 35 mA. Gate drive circuit design is compatible across all three parts without modification.

Q: What is the operating temperature range for all substitute parts?

A: All three parts operate across the identical temperature range of -40°C to 150°C (junction temperature TJ). Thermal management requirements are equivalent.