SJ4012RTP Equivalent & Substitute Parts

Part Overview

The SJ4012RTP is a standard recovery silicon-controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 600 V off-state voltage and 12 A RMS on-state current in a through-hole TO-220AB package. This thyristor is designed for AC power control applications requiring gate-triggered switching with standard recovery characteristics. The part is Active status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when electrical parameters, mechanical packaging, and compliance certifications remain equivalent across the specified operating range.

Substiute Parts

SJ4012RTP

Littelfuse Inc.In Stock: 661SJ4012RTP Datasheet

Current PartRFQ

SJ6012RTP

Littelfuse Inc.In Stock: 774SJ6012RTP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SJ4012RTP is determined by equivalence across the following critical parameters:

• Voltage Rating: Off-state voltage must equal 600 V
• Current Rating: On-state RMS current must equal 12 A
• Gate Characteristics: Gate trigger voltage (Vgt) and current (Igt) must not exceed specified maximums
• On-State Performance: Forward voltage drop (Vtm) and holding current (Ih) must remain within limits
• Recovery Type: Standard recovery classification must be maintained
• Package: TO-220-3 through-hole configuration required
• Compliance: RoHS3 compliance and REACH unaffected status must be preserved

The SJ6012RTP meets all these criteria and is classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both SJ4012RTP and SJ6012RTP are Active status products with identical electrical specifications, mechanical packaging, and regulatory compliance. Selection between these parts may be based on:

• Inventory Availability: SJ6012RTP has 665 pieces in stock; SJ4012RTP has 610 pieces in stock
• Supply Chain Continuity: Both parts maintain Active status with equivalent lead times and sourcing stability
• Compliance Requirements: Both parts satisfy RoHS3 and REACH requirements for regulated applications
• Thermal Management: Both parts operate across the identical temperature range (-40°C to 150°C TJ) and are suitable for equivalent thermal environments

No electrical or mechanical differentiation exists between these parts. Direct substitution is supported in all applications where the SJ4012RTP is specified.

Frequently Asked Questions (FAQ)

Q: Can SJ6012RTP replace SJ4012RTP in existing designs?

A: Yes. All electrical parameters, gate characteristics, on-state performance, recovery type, and package specifications are identical. Direct substitution is supported without circuit modification.

Q: Are there differences in gate trigger behavior between these parts?

A: No. Both parts specify identical maximum gate trigger voltage (1.5 V) and current (20 mA), ensuring equivalent gate drive requirements and control circuit compatibility.

Q: Do these parts have the same thermal characteristics?

A: Yes. Both parts operate across -40°C to 150°C junction temperature range with identical on-state voltage drop (1.6 V max) and holding current (60 mA max), resulting in equivalent thermal dissipation profiles.

Q: Is the TO-220AB package identical for both parts?

A: Yes. Both parts use the TO-220-3 package configuration with TO-220AB supplier device package designation, ensuring identical PCB footprint, lead spacing, and mounting requirements.

Q: Are there compliance or certification differences?

A: No. Both parts carry ROHS3 compliance, REACH unaffected status, EAR99 export classification, and identical HTSUS coding. Regulatory requirements are fully equivalent.

Q: What is the difference between SJ4012 and SJ6012 base product numbers?

A: The base product numbers differ, but all specified electrical and mechanical parameters are identical. The difference reflects internal Littelfuse product line organization and does not affect functional equivalence.

Q: Can these parts be used interchangeably in high-current applications?

A: Yes. Both parts are rated for 12 A RMS on-state current and 100A/120A non-repetitive surge current (50/60Hz), supporting identical high-current switching applications.