SJ4012NRP Equivalent & Substitute Parts

Part Overview

The SJ4012NRP is a 600V, 12A standard recovery silicon-controlled rectifier (SCR) manufactured by Littelfuse Inc. in Surface Mount TO-263 (D2PAK) packaging. This thyristor is designed for high-voltage switching applications requiring reliable gate-triggered control within the -40°C to 150°C operating temperature range. The part is Active status and ROHS3 compliant, making it suitable for modern industrial and consumer electronics applications. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across all critical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	600	V
Current - On State (It (RMS)) (Max)	12	A
Voltage - On State (Vtm) (Max)	1.6	V
Voltage - Gate Trigger (Vgt) (Max)	1.5	V
Current - Gate Trigger (Igt) (Max)	20	mA
Current - Hold (Ih) (Max)	60	mA
Operating Temperature Range	-40 to 150	°C (TJ)
Package / Case	TO-263-3, D2PAK	Surface Mount
SCR Type	Standard Recovery	—

Substitute Part Grouping Explanation

Substitution of the SJ4012NRP is determined by strict equivalence across electrical and mechanical parameters. The following criteria establish valid substitution:

Electrical Equivalence Requirements:

Off-state voltage rating: 600V
On-state RMS current rating: 12A
On-state voltage drop (Vtm): 1.6V maximum
Gate trigger voltage (Vgt): 1.5V maximum
Gate trigger current (Igt): 20mA maximum
Hold current (Ih): 60mA maximum
SCR recovery type: Standard Recovery

Mechanical Compatibility Requirements:

Package type: TO-263-3 (D2PAK, 2 Leads + Tab)
Mounting type: Surface Mount
Supplier device package: TO-263 (D2PAK)

Compliance & Status Requirements:

Product status: Active
RoHS compliance: ROHS3 Compliant
Moisture sensitivity level: MSL 1 (Unlimited)

The SJ6012NRP meets all substitution criteria and is classified as a parametric equivalent.

Parameter Comparison

Parameter	SJ4012NRP	SJ6012NRP	Match
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	✓
Category	Thyristors	Thyristors	✓
Voltage - Off State	600 V	600 V	✓
Current - On State (It (RMS)) (Max)	12 A	12 A	✓
Voltage - On State (Vtm) (Max)	1.6 V	1.6 V	✓
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	✓
Current - Gate Trigger (Igt) (Max)	20 mA	20 mA	✓
Current - Hold (Ih) (Max)	60 mA	60 mA	✓
Current - Off State (Max)	10 µA	10 µA	✓
Operating Temperature	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	✓
SCR Type	Standard Recovery	Standard Recovery	✓
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	✓
Mounting Type	Surface Mount	Surface Mount	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
MSL	1 (Unlimited)	1 (Unlimited)	✓
Product Status	Active	Active	✓

Engineering Selection Recommendations

SJ6012NRP is a direct parametric equivalent to SJ4012NRP. Both parts are manufactured by Littelfuse Inc., maintain identical electrical specifications across all critical parameters, and share the same Surface Mount TO-263 (D2PAK) package configuration. Both parts are Active status products with ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and environmental standards.

Selection between SJ4012NRP and SJ6012NRP is determined by inventory availability and supply chain requirements. The SJ6012NRP currently maintains higher inventory levels (1399 Pcs vs. 757 Pcs), which may influence procurement decisions for high-volume applications. No electrical or mechanical differentiation exists between these parts.

Frequently Asked Questions (FAQ)

Q: Can SJ6012NRP replace SJ4012NRP in existing designs?

A: Yes. The SJ6012NRP is a parametric equivalent with identical electrical ratings (600V, 12A RMS), gate trigger characteristics, on-state voltage drop, and operating temperature range. Both parts use the same TO-263 (D2PAK) Surface Mount package with identical pinout and mechanical dimensions.

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

A: No. Both parts specify identical gate trigger voltage (Vgt) of 1.5V maximum and gate trigger current (Igt) of 20mA maximum. Gate control circuits require no modification.

Q: Do these parts have different thermal characteristics?

A: No. Both parts operate across the identical temperature range of -40°C to 150°C (TJ) and maintain the same on-state voltage drop (Vtm) of 1.6V maximum, resulting in equivalent thermal performance in switching applications.

Q: Is the TO-263 (D2PAK) package identical for both parts?

A: Yes. Both SJ4012NRP and SJ6012NRP use TO-263-3 (D2PAK, 2 Leads + Tab) Surface Mount packaging. PCB footprints, solder pad layouts, and thermal tab dimensions are identical.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both SJ4012NRP and SJ6012NRP are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for industrial and consumer applications.

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

A: The base product numbers (SJ4012 vs. SJ6012) represent different manufacturing series within the Littelfuse SJ thyristor family. Despite different series designations, the SJ6012NRP maintains complete parametric equivalence to SJ4012NRP across all specified electrical and mechanical parameters.

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