S6040NTP SCR 600V 40A TO-263 Equivalent & Substitute Parts

Part Overview

The S6040NTP is a Silicon Controlled Rectifier (SCR) manufactured by Littelfuse Inc., rated for 600V off-state voltage and 40A RMS on-state current in a Surface Mount TO-263 (D2PAK) package. This thyristor is classified as Standard Recovery type and is currently in Active product status. The S6040NTP is designed for high-current switching applications requiring robust voltage blocking capability and thermal management in compact surface mount form factors. Equivalent and substitute parts are identified based on matching electrical ratings, package compatibility, and operational parameters within the 600V class thyristor category.

Key Parameters

Parameter	S6040NTP (Littelfuse)
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	40 A
Voltage - On State (Vtm) (Max)	1.8 V
Current - Gate Trigger (Igt) (Max)	40 mA
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Hold (Ih) (Max)	60 mA
SCR Type	Standard Recovery
Package / Case	TO-263-3, D2PAK
Operating Temperature Range	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the S6040NTP is determined by the following critical parameters:

Voltage Rating (Off State): All substitutes must maintain 600V blocking capability
Current Rating (RMS): Substitute parts are grouped by on-state RMS current capacity: 12A, 25A, or higher ratings
Package Type: All substitutes use TO-263-3 D2PAK surface mount package with identical pinout
SCR Type: All substitutes are Standard Recovery thyristors
Gate Trigger Parameters: Vgt and Igt values determine gate drive circuit compatibility
Compliance: All substitutes maintain ROHS3 compliance and EAR99 classification

The S6040NTP (40A RMS) can be substituted with the TN2540-600G-TR (25A RMS) for applications with reduced current requirements. The TN1215-600G-TR and TN1205H-6G-TR (both 12A RMS) are suitable only for lower-current applications. Reverse substitution (using S6040NTP in place of lower-rated parts) is not recommended due to thermal and current handling differences.

Parameter Comparison

Parameter	S6040NTP (Littelfuse)	TN1205H-6G-TR (STMicroelectronics)	TN1215-600G-TR (STMicroelectronics)	TN2540-600G-TR (STMicroelectronics)
Voltage - Off State	600 V	600 V	600 V	600 V
Current - On State (It (RMS)) (Max)	40 A	12 A	12 A	25 A
Current - On State (It (AV)) (Max)	25 A	7.6 A	8 A	16 A
Voltage - On State (Vtm) (Max)	1.8 V	1.6 V	1.6 V	1.6 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.3 V	1.3 V	1.3 V
Current - Gate Trigger (Igt) (Max)	40 mA	5 mA	15 mA	40 mA
Current - Hold (Ih) (Max)	60 mA	20 mA	30 mA	50 mA
Current - Off State (Max)	10 µA	5 µA	5 µA	5 µA
Current - Non Rep. Surge (50Hz)	430 A	120 A	140 A	300 A
Current - Non Rep. Surge (60Hz)	520 A	126 A	145 A	314 A
SCR Type	Standard Recovery	Standard Recovery	Standard Recovery	Standard Recovery
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitution (Equivalent Current Rating): The TN2540-600G-TR from STMicroelectronics provides the closest electrical equivalence to the S6040NTP, with 25A RMS on-state current. This part maintains 600V blocking voltage, Standard Recovery SCR type, and TO-263 D2PAK package compatibility. Both parts are ROHS3 compliant and carry EAR99 classification. The TN2540-600G-TR is suitable for applications where the full 40A capacity of the S6040NTP is not required but higher current handling than 12A is necessary.

Downrated Substitution (Lower Current Rating): The TN1215-600G-TR and TN1205H-6G-TR are 12A RMS rated alternatives suitable only for applications with significantly reduced current requirements. These parts share identical 600V voltage rating, Standard Recovery type, and D2PAK package. The TN1215-600G-TR offers gate trigger current matching (40 mA) to the S6040NTP, while the TN1205H-6G-TR provides lower gate trigger current (5 mA). Both maintain ROHS3 compliance and active product status.

Compliance and Certification: All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), REACH Unaffected status, and EAR99 export classification. All parts are currently in Active product status with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the S6040NTP be directly replaced with the TN2540-600G-TR? A: The TN2540-600G-TR is electrically compatible for applications requiring up to 25A RMS on-state current. Both parts share identical 600V voltage rating, Standard Recovery type, and TO-263 D2PAK package. However, the TN2540-600G-TR has lower surge current capability (300A/314A vs. 430A/520A), which may affect performance in high-transient applications.

Q: What is the difference between the TN1215-600G-TR and TN1205H-6G-TR? A: Both parts are rated for 12A RMS on-state current and 600V blocking voltage in D2PAK package. The primary differences are gate trigger current (TN1215: 15 mA max vs. TN1205H: 5 mA max) and packaging format (TN1215: Cut Tape & Digi-Reel vs. TN1205H: Tape & Reel). The TN1205H-6G-TR has a wider operating temperature range (-40°C to 150°C vs. -40°C to 125°C).

Q: Are all substitute parts pin-compatible with the S6040NTP? A: Yes. All substitute parts use the TO-263-3 D2PAK package with identical pinout: Gate, Cathode, and Anode connections. Direct PCB footprint compatibility is confirmed.

Q: Can the S6040NTP be used as a substitute for the lower-rated parts? A: The S6040NTP can be used in applications designed for TN2540-600G-TR, TN1215-600G-TR, or TN1205H-6G-TR from an electrical standpoint, as it exceeds their current ratings. However, thermal design and PCB layout may require adjustment due to higher power dissipation characteristics.

Q: What are the key parameters to verify before substitution? A: Verify (1) on-state RMS current requirement, (2) gate drive circuit compatibility (Vgt and Igt values), (3) surge current withstand capability, and (4) operating temperature range requirements. All substitute parts maintain 600V blocking voltage and Standard Recovery type.

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