SJ4020LATP Equivalent & Substitute Parts

Part Overview

The SJ4020LATP is a standard recovery silicon-controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 600 V off-state voltage and 20 A RMS on-state current in a TO-220-3 through-hole package with isolated tab. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified based on matching electrical characteristics, package compatibility, and thermal operating range to ensure functional equivalence in circuit applications.

Substiute Parts

SJ4020LATP

Littelfuse Inc.In Stock: 883SJ4020LATP Datasheet

Current PartRFQ

SJ6020LTP

Littelfuse Inc.In Stock: 1655SJ6020LTP Datasheet

Parametric EquivalentRFQ

SJ6025LTP

Littelfuse Inc.In Stock: 1663SJ6025LTP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SJ4020LATP are identified based on the following criteria:

Electrical Parameter Matching:

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

Package and Mechanical Compatibility:

• Package type: TO-220-3 Full Pack, Isolated Tab (identical across all parts)
• Mounting type: Through Hole (identical across all parts)
• Supplier device package: ITO-220AB (identical across all parts)

On-State Current Capability: The SJ4020LATP is rated for 20 A RMS on-state current. Substitute SJ6020LTP maintains this 20 A RMS rating. Substitute SJ6025LTP provides 25 A RMS capability, representing a higher current rating within the same package and voltage class.

Compliance and Status: All parts maintain Active product status, ROHS3 compliance, MSL 1 (Unlimited), REACH Unaffected status, and identical ECCN and HTSUS classifications.

Parameter Comparison

Engineering Selection Recommendations

SJ6020LTP as Direct Equivalent: The SJ6020LTP provides complete electrical and mechanical equivalence to the SJ4020LATP. All gate trigger parameters, on-state voltage, hold current, and leakage current specifications are identical. The 20 A RMS on-state current rating matches the original part exactly. Both components share identical compliance certifications (ROHS3, REACH Unaffected, MSL 1) and Active product status. This part is suitable for direct substitution in applications where the original SJ4020LATP is specified.

SJ6025LTP as Higher Current Alternative: The SJ6025LTP maintains all gate trigger and voltage specifications identical to the SJ4020LATP but provides increased on-state current capability at 25 A RMS versus 20 A RMS. The average on-state current increases from 12.8 A to 16 A, and non-repetitive surge current ratings increase from 225 A / 300 A to 300 A / 350 A at 50 Hz and 60 Hz respectively. This part is suitable for applications requiring higher current handling within the same voltage and package class. All compliance and thermal specifications remain identical.

Both substitute parts maintain Active product status and full ROHS3 compliance, ensuring regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can SJ6020LTP replace SJ4020LATP in all applications?

A: Yes. The SJ6020LTP is electrically and mechanically equivalent to the SJ4020LATP. All gate trigger parameters, on-state voltage, hold current, leakage current, operating temperature range, and package specifications are identical. Both parts are rated for 20 A RMS on-state current and 600 V off-state voltage.

Q: What is the difference between SJ6025LTP and SJ4020LATP?

A: The SJ6025LTP differs in on-state current ratings. It provides 25 A RMS on-state current and 16 A average on-state current, compared to 20 A RMS and 12.8 A average for the SJ4020LATP. Non-repetitive surge current ratings are also higher: 300 A / 350 A versus 225 A / 300 A at 50 Hz / 60 Hz. All other electrical parameters, including gate trigger voltage, on-state voltage, hold current, and operating temperature range, remain identical.

Q: Are all three parts in the same package?

A: Yes. The SJ4020LATP, SJ6020LTP, and SJ6025LTP all use the TO-220-3 Full Pack with isolated tab package (ITO-220AB). All are through-hole mounted components with identical mechanical footprints and pin configurations.

Q: Do these parts have the same compliance certifications?

A: Yes. All three parts are ROHS3 compliant, REACH Unaffected, MSL 1 (Unlimited), and share identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications. All maintain Active product status.

Q: When should I use SJ6025LTP instead of SJ4020LATP?

A: Use SJ6025LTP when your application requires higher on-state current capacity. The 25 A RMS rating and increased surge current handling (300 A / 350 A) provide additional margin in high-current switching applications. The identical gate trigger and voltage specifications ensure compatible gate drive circuitry.

Q: What is the operating temperature range for these parts?

A: All three parts operate from -40°C to 150°C junction temperature (TJ), providing identical thermal performance across the full product range.