S8040NTP Equivalent & Substitute Parts

Part Overview

The S8040NTP is a silicon-controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 800V off-state voltage with 40A RMS on-state current capability. This thyristor is designed for surface mount applications in the TO-263 (D2PAK) package and maintains active product status with full RoHS3 compliance. Alternative part numbers become necessary when addressing specific application requirements such as reduced current ratings, alternative packaging formats, or manufacturer availability constraints while maintaining the core 800V voltage class and standard recovery characteristics.

Key Parameters

Parameter	S8040NTP
Voltage - Off State	800 V
Current - On State (It (RMS)) (Max)	40 A
Voltage - On State (Vtm) (Max)	1.8 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	40 mA
Current - Hold (Ih) (Max)	60 mA
SCR Type	Standard Recovery
Package / Case	TO-263-3, D2PAK
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the S8040NTP is determined by the following mandatory parameters:

Voltage Class: All substitutes must maintain 800V off-state voltage rating
SCR Type: Standard Recovery topology required
Package: TO-263 family (D2PAK) surface mount configuration
Operating Temperature Range: -40°C to 125°C minimum
Compliance: RoHS3 and REACH status alignment

The three qualified substitutes differ primarily in on-state current ratings and gate trigger characteristics. Current rating reduction is acceptable when application load requirements permit. Gate trigger voltage and current parameters may vary within the 800V class without affecting core switching functionality.

Parameter Comparison

Parameter	S8040NTP (Littelfuse)	CS19-08HO1S-TRL (IXYS)	TN1215-800G-TR (STMicroelectronics)	TN2540-800G-TR (STMicroelectronics)
Voltage - Off State	800 V	800 V	800 V	800 V
Current - On State (It (RMS)) (Max)	40 A	29 A	12 A	25 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	1.5 V	1.3 V	1.3 V
Current - Gate Trigger (Igt) (Max)	40 mA	28 mA	15 mA	40 mA
Current - Hold (Ih) (Max)	60 mA	50 mA	30 mA	50 mA
SCR Type	Standard Recovery	Standard Recovery	Standard Recovery	Standard Recovery
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All four thyristors maintain active product status with full RoHS3 compliance and REACH unaffected designation, ensuring regulatory alignment across applications.

CS19-08HO1S-TRL (IXYS) provides the closest current rating match at 29A RMS, suitable for applications requiring 40A capability where moderate derating is acceptable. Gate trigger parameters align with the primary part.

TN2540-800G-TR (STMicroelectronics) offers 25A RMS rating with matching gate trigger current specification (40 mA), appropriate for medium-current 800V switching applications. This part provides the highest non-repetitive surge current rating at 314A.

TN1215-800G-TR (STMicroelectronics) is rated for 12A RMS and represents the lowest current option. This part is suitable only for low-current applications and should not be selected for designs requiring the full 40A capability of the primary part.

Frequently Asked Questions (FAQ)

Q: Can TN1215-800G-TR replace S8040NTP in all applications? A: No. The TN1215-800G-TR is rated for 12A RMS maximum on-state current, compared to 40A for the S8040NTP. Selection depends on actual circuit current requirements. Exceeding the 12A rating will result in device failure.

Q: What is the primary difference between CS19-08HO1S-TRL and TN2540-800G-TR? A: Both are 800V standard recovery SCRs in TO-263 packaging. CS19-08HO1S-TRL is rated for 29A RMS with 28 mA gate trigger current. TN2540-800G-TR is rated for 25A RMS with 40 mA gate trigger current. Selection depends on gate drive circuit capability and current margin requirements.

Q: Are all substitutes available in the same packaging format? A: All four parts use TO-263 (D2PAK) surface mount packages with identical pinout and thermal characteristics. Mechanical compatibility is maintained across all options.

Q: Do packaging format differences affect substitution? A: S8040NTP is supplied without specified packaging format. CS19-08HO1S-TRL is supplied in Tape & Reel (TR). TN1215-800G-TR and TN2540-800G-TR are supplied in Cut Tape (CT) & Digi-Reel format. Component-level functionality remains identical; packaging affects only procurement and handling logistics.

Q: What is the significance of the 800V voltage rating in substitution? A: The 800V off-state voltage rating is the primary classification parameter. All qualified substitutes maintain this voltage class. Substitution outside this voltage class is not permitted and will result in circuit failure or safety hazard.

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