SJ4012LTP Equivalent & Substitute Parts

Part Overview

The SJ4012LTP is an active-status Silicon Controlled Rectifier (SCR) manufactured by Littelfuse Inc., designed for high-voltage switching applications. This thyristor operates at 600 V off-state voltage with a 12 A RMS on-state current rating and standard recovery characteristics. The device is packaged in TO-220-3 with an isolated tab (ITO-220AB) for through-hole mounting applications requiring thermal management.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same product category, enabling direct replacement in circuit designs without functional degradation.

Substiute Parts

SJ4012LTP

Littelfuse Inc.In Stock: 771SJ4012LTP Datasheet

Current PartRFQ

SJ6012LTP

Littelfuse Inc.In Stock: 1750SJ6012LTP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SJ4012LTP is determined by strict equivalence across the following critical parameters:

• Voltage Rating (Off-State): 600 V minimum
• Current Rating (RMS On-State): 12 A minimum
• Gate Trigger Characteristics: Vgt ≤ 1.5 V, Igt ≤ 20 mA
• On-State Voltage Drop: Vtm ≤ 1.6 V
• Hold Current: Ih ≤ 60 mA
• Recovery Type: Standard Recovery
• Package Configuration: TO-220-3 with isolated tab (ITO-220AB)
• Mounting Method: Through-hole
• Temperature Operating Range: -40°C to 150°C (TJ)
• Compliance Status: ROHS3 Compliant, REACH Unaffected

Substitute parts must match all electrical parameters within specified maximums and maintain identical mechanical packaging and mounting characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the SJ4012LTP and SJ6012LTP are active-status products from Littelfuse Inc. with full ROHS3 compliance and REACH unaffected status. All electrical parameters, mechanical packaging, and thermal operating ranges are identical between the two devices.

Selection between these parts is based on inventory availability and supply chain considerations. The SJ6012LTP currently maintains higher inventory levels (1653 Pcs) compared to the SJ4012LTP (748 Pcs), which may influence procurement decisions for high-volume applications.

Both devices are suitable for direct substitution in through-hole SCR applications requiring 600 V blocking voltage and 12 A RMS current handling with standard recovery characteristics.

Frequently Asked Questions (FAQ)

Q: Can SJ6012LTP replace SJ4012LTP in existing circuit designs?

A: Yes. All electrical parameters, gate trigger characteristics, on-state voltage drops, hold currents, and thermal operating ranges are identical. The TO-220-3 ITO-220AB package configuration is identical, enabling direct pin-for-pin replacement without circuit modification.

Q: Are there differences in RoHS or REACH compliance between these parts?

A: No. Both SJ4012LTP and SJ6012LTP are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements.

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

A: The base product numbers differ, but the electrical and mechanical specifications provided are identical. The difference reflects internal Littelfuse product line designation and does not affect functional equivalence for substitution purposes.

Q: Are both parts suitable for high-temperature applications?

A: Yes. Both devices operate across the identical temperature range of -40°C to 150°C (TJ), supporting high-temperature switching applications with equivalent thermal performance.

Q: What is the moisture sensitivity level for these SCR devices?

A: Both parts have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements during storage and handling.

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

A: Yes. Both devices have identical non-repetitive surge current ratings of 100 A (50 Hz) and 120 A (60 Hz), supporting equivalent surge handling capability.