SJ4020L2TP Equivalent & Substitute Parts

Part Overview

The SJ4020L2TP is a Silicon Controlled Rectifier (SCR) manufactured by Littelfuse Inc., rated for 600 V off-state voltage and 20 A RMS on-state current. This thyristor operates as a standard recovery device in the TO-220-3 package with isolated tab configuration. The part is Active status and ROHS3 compliant, suitable for industrial switching and power control applications requiring through-hole mounting.

Substitute parts become necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility permits selection from equivalent devices within the same electrical and mechanical parameter range. All substitute parts listed maintain identical or superior electrical characteristics and package compatibility with the SJ4020L2TP.

Substiute Parts

SJ4020L2TP

Littelfuse Inc.In Stock: 852SJ4020L2TP 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 is determined by the following criteria:

Mandatory Matching Parameters:

• Voltage - Off State: 600 V (all substitutes must equal or exceed this rating)
• Package / Case: TO-220-3 Full Pack, Isolated Tab (mechanical and thermal compatibility)
• Supplier Device Package: ITO-220AB (pin configuration and mounting compatibility)
• SCR Type: Standard Recovery (switching characteristics and recovery behavior)
• Operating Temperature Range: -40°C to 150°C (thermal envelope)
• RoHS Status: ROHS3 Compliant (regulatory compliance)

Allowable Parameter Variations:

• Current - On State (It RMS) Max: Substitutes rated at 20 A or higher are acceptable
• Current - On State (It AV) Max: Proportional to RMS rating; higher values indicate greater current capacity
• Current - Non Rep. Surge (Itsm): Higher surge ratings provide additional design margin
• Gate trigger parameters (Vgt, Igt): Identical specifications across all substitutes ensure gate drive compatibility

Substitutes are grouped into two categories: direct equivalents (identical current rating) and upgraded alternatives (higher current capacity).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Same Current Rating): SJ6020L2TP is a direct parametric equivalent to SJ4020L2TP. Both devices share identical electrical specifications including 20 A RMS current rating, 600 V off-state voltage, and gate trigger parameters. Selection between these parts depends on inventory availability and lead time requirements. SJ6020L2TP currently maintains higher inventory (1321 Pcs vs. 784 Pcs).

Upgraded Alternatives (Higher Current Capacity): SJ6025L2TP, SV6025L2TP, and SV6025L2QTP are rated for 25 A RMS on-state current, providing 25% greater current capacity than the SJ4020L2TP. These devices are suitable for applications where the SJ4020L2TP operates near its maximum current rating or where design margin enhancement is required. All three maintain identical gate trigger specifications and operating temperature range.

Lower Current Alternatives: SV6016L2TP and SV6016L2QTP are rated for 16 A RMS on-state current. These devices are suitable only for applications where the load current does not exceed 16 A. Selection of these parts represents a downgrade in current capacity and should be limited to designs with confirmed lower current requirements.

Compliance and Status: All substitute parts are Active status, ROHS3 compliant, and REACH unaffected. Moisture Sensitivity Level is 1 (Unlimited) across all parts, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can SJ6020L2TP directly replace SJ4020L2TP in my circuit?

A: Yes. SJ6020L2TP is a direct parametric equivalent with identical electrical specifications. Both devices are rated for 600 V off-state voltage, 20 A RMS on-state current, 1.5 V maximum gate trigger voltage, and 10 mA maximum gate trigger current. The TO-220-3 ITO-220AB package ensures mechanical and thermal compatibility. No circuit modifications are required.

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

A: The SJ and SV series are both Littelfuse standard recovery SCRs with identical electrical parameters when comparing equivalent current ratings. The series designation reflects internal design variations. Both series maintain the same voltage, current, and gate trigger specifications. Selection between series depends on availability and application-specific requirements.

Q: Can I use SJ6025L2TP (25 A) instead of SJ4020L2TP (20 A)?

A: Yes. SJ6025L2TP is rated for 25 A RMS on-state current, which exceeds the 20 A requirement of SJ4020L2TP. The higher current rating provides additional design margin and thermal headroom. All other electrical parameters remain compatible. This substitution is suitable for applications where enhanced current capacity is beneficial or where the load current approaches the 20 A limit.

Q: Can I use SV6016L2TP (16 A) instead of SJ4020L2TP (20 A)?

A: No. SV6016L2TP is rated for 16 A RMS on-state current, which is below the 20 A specification of SJ4020L2TP. This device is suitable only for applications confirmed to operate at 16 A or lower. Using this part in a circuit designed for 20 A operation will result in thermal stress and potential device failure.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts listed use the TO-220-3 Full Pack with isolated tab configuration and ITO-220AB supplier device package. This ensures identical mechanical fit, pin configuration, and thermal interface characteristics. No PCB layout modifications are required when substituting between these parts.

Q: What is the significance of the "L2" designation in the part number?

A: The "L2" designation indicates the specific package variant within the TO-220 family. All parts listed include "L2" in their part numbers, confirming they share the same package configuration. This designation is part of Littelfuse's internal naming convention and does not affect electrical performance or substitution eligibility.

Q: Do all substitute parts have the same gate trigger specifications?

A: Yes. All substitute parts maintain identical gate trigger parameters: 1.5 V maximum gate trigger voltage (Vgt) and 10 mA maximum gate trigger current (Igt). This ensures compatibility with existing gate drive circuits. No modifications to gate drive circuitry are required when substituting between these parts.

Q: What inventory levels should I consider for procurement?

A: Current inventory levels are: SJ4020L2TP (784 Pcs), SJ6020L2TP (1321 Pcs), SJ6025L2TP (1393 Pcs), SV6016L2TP (1822 Pcs), SV6016L2QTP (1952 Pcs), SV6025L2TP (1883 Pcs), and SV6025L2QTP (1656 Pcs). Higher inventory levels indicate better availability for immediate procurement. SV6016L2QTP and SV6016L2TP maintain the highest stock levels.