SJ6040R2ATP Equivalent & Substitute Parts

Part Overview

The SJ6040R2ATP is a 40 ampere standard recovery silicon controlled rectifier (SCR) manufactured by Littelfuse Inc. in a TO-220AB through-hole package rated for 600 volts off-state operation. This component is designed for applications requiring high-current thyristor switching and rectification in automotive and industrial environments. The part maintains active product status with 677 units in current inventory stock.

Substitute parts are identified when electrical parameters, mechanical packaging, and operational ratings remain within the specified tolerances of the original component, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	600	V
Current - On State (It (RMS)) (Max)	40	A
Current - On State (It (AV)) (Max)	25	A
Voltage - Gate Trigger (Vgt) (Max)	1.5	V
Current - Gate Trigger (Igt) (Max)	15	mA
Voltage - On State (Vtm) (Max)	1.7	V
Current - Hold (Ih) (Max)	50	mA
Current - Off State (Max)	10	µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	430A, 520A	A
Operating Temperature Range	-40 to 150	°C (TJ)
SCR Type	Standard Recovery	—
Package / Case	TO-220-3	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SJ6040R2ATP is permissible with the SJ6040R2TP based on electrical and mechanical parameter equivalence. Both components share identical ratings across all critical switching and thermal parameters: 600 V off-state voltage, 40 A RMS on-state current, 25 A average on-state current, 1.5 V maximum gate trigger voltage, 15 mA maximum gate trigger current, 1.7 V maximum on-state voltage, 50 mA maximum hold current, and 10 µA maximum off-state leakage current. Both devices employ standard recovery SCR technology with identical surge current ratings of 430 A and 520 A at 50 Hz and 60 Hz respectively. Operating temperature range, package configuration (TO-220-3), mounting methodology (through-hole), and environmental compliance (ROHS3) are identical between the two parts. The base product number SJ6040 is common to both variants, confirming parametric equivalence within the Littelfuse SJxx40xx series.

Parameter Comparison

Parameter	SJ6040R2ATP	SJ6040R2TP	Match
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Yes
Category	Thyristors	Thyristors	Yes
Voltage - Off State	600 V	600 V	Yes
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	Yes
Current - Gate Trigger (Igt) (Max)	15 mA	15 mA	Yes
Voltage - On State (Vtm) (Max)	1.7 V	1.7 V	Yes
Current - On State (It (AV)) (Max)	25 A	25 A	Yes
Current - On State (It (RMS)) (Max)	40 A	40 A	Yes
Current - Hold (Ih) (Max)	50 mA	50 mA	Yes
Current - Off State (Max)	10 µA	10 µA	Yes
Current - Non Rep. Surge 50, 60Hz (Itsm)	430A, 520A	430A, 520A	Yes
SCR Type	Standard Recovery	Standard Recovery	Yes
Operating Temperature	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	Yes
Mounting Type	Through Hole	Through Hole	Yes
Package / Case	TO-220-3	TO-220-3	Yes
Supplier Device Package	TO-220AB	TO-220AB	Yes
Base Product Number	SJ6040	SJ6040	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
REACH Status	REACH Unaffected	REACH Unaffected	Yes
ECCN	EAR99	EAR99	Yes
HTSUS	8541.30.0080	8541.30.0080	Yes
Product Status	Active	Active	Yes

Engineering Selection Recommendations

Both the SJ6040R2ATP and SJ6040R2TP maintain active product status with current manufacturing support from Littelfuse Inc. Selection between these components is based on inventory availability and supply chain considerations rather than electrical or mechanical differentiation.

The SJ6040R2ATP carries automotive-grade qualification under AEC-Q101 standard, designating it for use in automotive applications with enhanced reliability requirements. The SJ6040R2TP does not specify automotive qualification in the provided parameters.

For applications requiring automotive-grade certification compliance, the SJ6040R2ATP is the specified selection. For general industrial applications where automotive qualification is not mandated, either component satisfies the electrical and mechanical requirements identically.

Both parts comply with ROHS3 and REACH regulatory frameworks, confirming environmental and hazardous substance restrictions compliance. The identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications confirm equivalent export control and tariff treatment.

Frequently Asked Questions (FAQ)

Q: Can the SJ6040R2TP directly replace the SJ6040R2ATP in all applications?

A: The SJ6040R2TP provides electrical and mechanical equivalence to the SJ6040R2ATP across all specified parameters. However, the SJ6040R2ATP carries AEC-Q101 automotive qualification while the SJ6040R2TP does not. Direct substitution is permissible only in applications where automotive-grade certification is not a design requirement.

Q: What are the critical parameters that define substitution eligibility for these SCR components?

A: Substitution eligibility is determined by matching: off-state voltage (600 V), on-state current ratings (40 A RMS, 25 A average), gate trigger parameters (1.5 V maximum, 15 mA maximum), on-state voltage drop (1.7 V maximum), hold current (50 mA maximum), off-state leakage (10 µA maximum), surge current ratings (430 A / 520 A), operating temperature range (-40°C to 150°C), SCR recovery type (standard recovery), and package configuration (TO-220-3 through-hole).

Q: Are there differences in packaging or physical dimensions between these parts?

A: Both the SJ6040R2ATP and SJ6040R2TP utilize identical TO-220-3 package configuration with TO-220AB supplier device packaging. Physical dimensions, pin configuration, and mounting footprint are identical, enabling direct board-level substitution without layout modification.

Q: What is the significance of the base product number SJ6040 in relation to these parts?

A: The base product number SJ6040 identifies the core device family within the Littelfuse SJxx40xx series. Both the SJ6040R2ATP and SJ6040R2TP share this base designation, confirming they are variants within the same product line with identical electrical specifications.

Q: How do inventory levels affect component selection between these substitutes?

A: The SJ6040R2TP currently maintains higher inventory availability (1264 units) compared to the SJ6040R2ATP (677 units). For non-automotive applications, the SJ6040R2TP may provide superior supply chain continuity. For automotive-qualified designs, the SJ6040R2ATP remains the required selection regardless of inventory status.

Q: Are there any environmental or regulatory compliance differences between these components?

A: Both components are ROHS3 compliant and REACH unaffected. Both carry identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications. Environmental and regulatory compliance is equivalent between the two parts.

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