SJ4012R2TP Equivalent & Substitute Parts

Part Overview

The SJ4012R2TP is a 600V, 12A Standard Recovery SCR manufactured by Littelfuse Inc. in TO-220AB package configuration. This thyristor is designed for high-temperature applications with a junction temperature range of -40°C to 150°C. The part is Active status and ROHS3 compliant, making it suitable for industrial and commercial switching applications requiring reliable gate-triggered silicon-controlled rectifier performance.

Equivalent and substitute parts are identified when design requirements change, inventory constraints occur, or application parameters allow for higher current ratings within the same voltage class and package family. The SJ4012R2TP maintains compatibility with substitute parts that share identical electrical characteristics for gate trigger voltage, on-state voltage, hold current, and off-state leakage, while differing in on-state current capacity and surge ratings.

Key Parameters

Parameter	Value	Unit
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 - On State (It (RMS)) (Max)	12	A
Current - Hold (Ih) (Max)	35	mA
Current - Off State (Max)	10	µA
Operating Temperature Range (TJ)	-40 to 150	°C
Package / Case	TO-220-3
SCR Type	Standard Recovery
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SJ4012R2TP is determined by strict equivalence in the following critical parameters:

Mandatory Matching Parameters:

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

Variable Parameters (Substitution Allowed):

Current - On State (It (RMS)) (Max): 12A to 25A
Current - Non Rep. Surge 50, 60Hz (Itsm): 100A/120A to 300A/350A
SCR Type: Standard Recovery or Sensitive Gate

All substitute parts listed maintain identical gate trigger characteristics, on-state voltage drop, and thermal operating range. Substitution is valid when the application current requirement does not exceed the substitute part's rated on-state current capacity.

Parameter Comparison

Parameter	SJ4012R2TP	SJ6016R2TP	SJ6020R2TP	SJ6025R2TP	SV6016R2TP
Voltage - Off State (V)	600	600	600	600	600
Voltage - Gate Trigger (Vgt) (Max) (V)	1.5	1.5	1.5	1.5	1.5
Current - Gate Trigger (Igt) (Max) (mA)	10	10	10	10	10
Voltage - On State (Vtm) (Max) (V)	1.6	1.6	1.6	1.6	1.6
Current - On State (It (RMS)) (Max) (A)	12	16	20	25	16
Current - Hold (Ih) (Max) (mA)	35	35	35	35	35
Current - Off State (Max) (µA)	10	10	10	10	10
Operating Temperature (TJ) (°C)	-40 to 150	-40 to 150	-40 to 150	-40 to 150	-40 to 150
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
SCR Type	Standard Recovery	Standard Recovery	Standard Recovery	Standard Recovery	Sensitive Gate
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SJ6016R2TP is a direct parametric equivalent with increased current capacity (16A RMS vs. 12A RMS). Selection is appropriate when circuit design permits higher current handling without exceeding thermal or mechanical constraints. Surge current rating increases to 188A/225A. Standard Recovery type maintains identical switching characteristics.

SJ6020R2TP provides 20A RMS on-state current with proportionally increased surge ratings (225A/300A). This part accommodates applications requiring higher current margins while maintaining all gate trigger and thermal specifications. Standard Recovery type ensures compatibility with existing gate drive circuits.

SJ6025R2TP offers maximum current capacity at 25A RMS with surge ratings of 300A/350A. Selection is valid for high-current applications where the 12A rating of the SJ4012R2TP is insufficient. All electrical characteristics for gate triggering and thermal operation remain identical.

SV6016R2TP is a Sensitive Gate variant with 16A RMS capacity. This part differs in SCR type classification but maintains identical voltage ratings, gate trigger thresholds, and thermal range. Selection requires confirmation that sensitive gate characteristics are compatible with existing gate drive circuit design.

All substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can SJ6016R2TP, SJ6020R2TP, or SJ6025R2TP be used as direct replacements for SJ4012R2TP?

A: Yes, within application constraints. All three parts share identical gate trigger voltage (1.5V max), gate trigger current (10mA max), on-state voltage (1.6V max), hold current (35mA max), and operating temperature range (-40°C to 150°C). Substitution is valid when the application current requirement does not exceed the substitute part's rated RMS current. Higher-rated parts introduce no incompatibility with gate drive circuits or thermal management, provided circuit design accommodates the increased current capacity.

Q: What is the difference between Standard Recovery and Sensitive Gate SCR types?

A: Both types share identical voltage and thermal specifications. The distinction lies in gate sensitivity characteristics. Standard Recovery (SJ series) and Sensitive Gate (SV series) differ in gate drive requirements and switching behavior. SV6016R2TP is classified as Sensitive Gate, while SJ4012R2TP, SJ6016R2TP, SJ6020R2TP, and SJ6025R2TP are Standard Recovery. Selection between types depends on gate drive circuit design compatibility.

Q: Are all substitute parts available in the same TO-220AB package?

A: Yes. All listed substitute parts use TO-220-3 package configuration with TO-220AB supplier device package designation. Mechanical fit, pin assignment, and thermal interface characteristics are identical across all parts, enabling direct PCB-level substitution without layout modification.

Q: What inventory status applies to substitute parts?

A: SJ6016R2TP: 1484 Pcs New Original In Stock; SJ6020R2TP: 1329 Pcs New Original In Stock; SJ6025R2TP: 2262 Pcs New Original In Stock; SV6016R2TP: 1900 Pcs New Original In Stock. All parts are manufactured by Littelfuse Inc. and carry Active product status.

Q: Do all parts meet the same regulatory and compliance requirements?

A: Yes. All substitute parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.30.0080. Moisture Sensitivity Level is 1 (Unlimited) for all parts. Compliance status is identical across the SJ4012R2TP and all listed substitutes.

Q: What is the maximum surge current rating for each part?

A: SJ4012R2TP: 100A (50Hz) / 120A (60Hz); SJ6016R2TP: 188A / 225A; SJ6020R2TP: 225A / 300A; SJ6025R2TP: 300A / 350A. Higher-rated parts accommodate increased transient current events while maintaining identical steady-state gate trigger and on-state voltage characteristics.

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