SJ4012L2TP Equivalent & Substitute Parts

Part Overview

The SJ4012L2TP is a Silicon Controlled Rectifier (SCR) manufactured by Littelfuse Inc., rated for 600 V off-state voltage and 12 A RMS on-state current in a TO-220-3 through-hole package with isolated tab. This device operates across the temperature range of -40°C to 150°C (TJ) and is classified as Standard Recovery type SCR. The part is Active status and ROHS3 compliant.

Substitute parts are identified when equivalent electrical performance can be achieved within the same package form factor and thermal operating range, with compatible gate trigger characteristics and holding current specifications. Alternative models may be required due to inventory availability, application current requirements, or series preference within the Littelfuse SCR product line.

Substiute Parts

SJ4012L2TP

Littelfuse Inc.In Stock: 744SJ4012L2TP Datasheet

Current PartRFQ

SJ6020L2TP

Littelfuse Inc.In Stock: 1412SJ6020L2TP Datasheet

Parametric EquivalentRFQ

SJ6025L2TP

Littelfuse Inc.In Stock: 1470SJ6025L2TP Datasheet

Parametric EquivalentRFQ

SV6016L2QTP

Littelfuse Inc.In Stock: 1987SV6016L2QTP Datasheet

Parametric EquivalentRFQ

SV6016L2TP

Littelfuse Inc.In Stock: 1843SV6016L2TP Datasheet

Parametric EquivalentRFQ

SV6025L2QTP

Littelfuse Inc.In Stock: 1709SV6025L2QTP Datasheet

Parametric EquivalentRFQ

SV6025L2TP

Littelfuse Inc.In Stock: 1915SV6025L2TP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SJ4012L2TP is determined by the following criteria:

Mandatory Matching Parameters:

• Voltage - Off State: 600 V
• Voltage - Gate Trigger (Vgt) (Max): 1.5 V
• Current - Gate Trigger (Igt) (Max): 10 mA
• Voltage - On State (Vtm) (Max): 1.6 V
• Current - Hold (Ih) (Max): 35 mA
• Current - Off State (Max): 10 µA
• Operating Temperature Range: -40°C to 150°C (TJ)
• SCR Type: Standard Recovery
• Package / Case: TO-220-3 Full Pack, Isolated Tab
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant

Variable Parameters (Allow Substitution):

• Current - On State (It (RMS)) (Max): 12 A or higher
• Current - Non Rep. Surge 50, 60Hz (Itsm): 100A/120A or higher

The substitute parts listed below maintain all mandatory electrical and mechanical parameters while offering equal or superior current handling capabilities. All substitutes are manufactured by Littelfuse Inc. and maintain identical gate trigger thresholds, on-state voltage characteristics, and thermal operating specifications.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original SJ4012L2TP specification. Selection among substitute options is based on application current requirements:

SJ6020L2TP provides 20 A RMS on-state current capacity with 225 A / 300 A non-repetitive surge ratings, suitable for applications requiring current handling above the 12 A baseline.

SJ6025L2TP delivers 25 A RMS on-state current capacity with 300 A / 350 A non-repetitive surge ratings, appropriate for higher-current applications within the SJ series.

SV6016L2QTP and SV6016L2TP offer 16 A RMS on-state current capacity with 188 A / 225 A non-repetitive surge ratings, representing the SV series alternative with equivalent thermal performance.

SV6025L2QTP and SV6025L2TP provide 25 A RMS on-state current capacity with 300 A / 350 A non-repetitive surge ratings within the SV series product line.

All substitutes maintain identical gate trigger voltage (1.5 V max), gate trigger current (10 mA max), on-state voltage (1.6 V max), holding current (35 mA max), and off-state leakage current (10 µA max) specifications. The TO-220-3 package with isolated tab and through-hole mounting remains consistent across all options, ensuring mechanical and thermal interface compatibility.

Frequently Asked Questions (FAQ)

Q: Can SJ6020L2TP be used as a direct replacement for SJ4012L2TP?

A: SJ6020L2TP is electrically compatible with SJ4012L2TP. Both devices share identical gate trigger characteristics (1.5 V max Vgt, 10 mA max Igt), on-state voltage (1.6 V max), holding current (35 mA max), and operating temperature range (-40°C to 150°C TJ). The primary difference is increased on-state current capacity (20 A RMS vs. 12 A RMS) and higher non-repetitive surge ratings (225 A / 300 A vs. 100 A / 120 A). This substitution is valid for applications where the higher current rating does not create thermal or circuit design conflicts.

Q: What is the difference between SJ series and SV series SCRs in this list?

A: Both SJ and SV series devices listed maintain identical electrical parameters for gate trigger voltage, on-state voltage, holding current, and operating temperature range. The series designation reflects Littelfuse product line categorization. Selection between series is based on application requirements and inventory availability, as all electrical and mechanical specifications remain equivalent.

Q: Are SV6025L2QTP and SV6025L2TP interchangeable?

A: SV6025L2QTP and SV6025L2TP are electrically and mechanically identical. Both are rated for 25 A RMS on-state current, 600 V off-state voltage, and feature the same gate trigger characteristics and thermal operating range. The suffix difference (QTP vs. TP) reflects packaging or supplier designation but does not affect functional performance or compatibility.

Q: Can I use a higher-current rated SCR (25 A) in place of the 12 A SJ4012L2TP?

A: Higher-current rated SCRs such as SJ6025L2TP or SV6025L2TP maintain all critical electrical parameters (gate trigger voltage, on-state voltage, holding current, off-state leakage) identical to SJ4012L2TP. These devices are mechanically compatible in the TO-220-3 package. Substitution is valid from an electrical standpoint; however, circuit design must account for the device's increased current capacity to avoid unintended circuit behavior.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed (SJ6020L2TP, SJ6025L2TP, SV6016L2QTP, SV6016L2TP, SV6025L2QTP, SV6025L2TP) are ROHS3 compliant and REACH unaffected, matching the compliance status of the original SJ4012L2TP.

Q: What is the significance of the non-repetitive surge current rating?

A: The non-repetitive surge current rating (Itsm) specifies the maximum current the SCR can withstand during transient surge conditions at 50 Hz and 60 Hz. Higher ratings indicate greater transient immunity. Substitute parts with elevated Itsm values (e.g., 225 A / 300 A or 300 A / 350 A) provide enhanced protection against surge events compared to the original 100 A / 120 A rating.

Q: Is the isolated tab feature consistent across all substitute parts?

A: All substitute parts maintain the TO-220-3 Full Pack with isolated tab configuration, ensuring thermal interface compatibility and electrical isolation characteristics identical to SJ4012L2TP.