SK055NTP Equivalent & Substitute Parts

Part Overview

The SK055NTP is a 1 kV, 55 A standard recovery SCR manufactured by Littelfuse Inc. in a surface mount TO-263 (D2PAK) package. This thyristor is designed for high-current switching applications requiring reliable gate triggering and thermal management in compact form factors. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts may be required due to inventory constraints, supply chain disruptions, or application-specific performance requirements within compatible electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	1 kV	V
Current - On State (It (RMS)) (Max)	55 A	A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	V
Current - Gate Trigger (Igt) (Max)	40 mA	mA
Voltage - On State (Vtm) (Max)	1.8 V	V
Current - Hold (Ih) (Max)	60 mA	mA
Operating Temperature Range	-40°C to 125°C	°C
Package / Case	TO-263-3, D2PAK	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the SK055NTP is determined by strict adherence to the following electrical and mechanical criteria:

Mandatory Matching Parameters:

Voltage rating: 1 kV off-state voltage
Package type: TO-263-3 / D2PAK surface mount configuration
SCR type: Standard Recovery
Operating temperature range: -40°C to 125°C minimum
RoHS3 compliance and REACH unaffected status

Current Rating Considerations: Substitute parts must maintain compatibility with the application's current requirements. The SK055NTP specifies 55 A RMS on-state current. Substitute devices with lower current ratings (such as 16 A RMS) are suitable only for applications where the actual circuit current demand does not exceed the substitute part's maximum rating.

Gate Trigger Parameters: Gate trigger voltage (Vgt) and gate trigger current (Igt) must be compatible with the circuit's gate drive capability. The SK055NTP specifies Vgt (Max) of 1.5 V and Igt (Max) of 40 mA.

Parameter Comparison

Parameter	SK055NTP (Littelfuse)	TN1625-1000G-TR (STMicroelectronics)
Manufacturer	Littelfuse Inc.	STMicroelectronics
Voltage - Off State	1 kV	1 kV
Current - On State (It (RMS)) (Max)	55 A	16 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.3 V
Current - Gate Trigger (Igt) (Max)	40 mA	25 mA
Voltage - On State (Vtm) (Max)	1.8 V	1.6 V
Current - Hold (Ih) (Max)	60 mA	40 mA
Current - Off State (Max)	30 µA	5 µA
SCR Type	Standard Recovery	Standard Recovery
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SK055NTP (Littelfuse Inc.): Primary selection for applications requiring 55 A RMS on-state current capacity. Active product status with full production support. RoHS3 compliant and REACH unaffected. Suitable for high-current switching circuits within the specified voltage and temperature parameters.

TN1625-1000G-TR (STMicroelectronics): Suitable as a substitute only for applications where the actual circuit current demand does not exceed 16 A RMS. Shares identical voltage rating (1 kV), package configuration (TO-263-3 D2PAK), and operating temperature range (-40°C to 125°C). Active product status with full RoHS3 compliance and REACH unaffected status. Gate trigger parameters (Vgt 1.3 V, Igt 25 mA) are compatible with standard gate drive circuits. Lower on-state voltage drop (Vtm 1.6 V vs. 1.8 V) and reduced off-state leakage current (5 µA vs. 30 µA) may provide thermal and power efficiency benefits in lower-current applications.

Frequently Asked Questions (FAQ)

Q: Can TN1625-1000G-TR replace SK055NTP in all applications?

A: No. The TN1625-1000G-TR is rated for 16 A RMS on-state current, while the SK055NTP is rated for 55 A RMS. Substitution is valid only when the actual circuit current does not exceed 16 A RMS. Exceeding this rating will cause device failure.

Q: Are the packages physically identical?

A: Yes. Both devices use the TO-263-3 (D2PAK) surface mount package with identical pin configuration and thermal tab. PCB layout and footprints are compatible.

Q: What are the gate drive differences between these parts?

A: The SK055NTP requires Vgt (Max) 1.5 V and Igt (Max) 40 mA. The TN1625-1000G-TR requires Vgt (Max) 1.3 V and Igt (Max) 25 mA. Both are compatible with standard gate drive circuits. The TN1625 requires slightly lower gate current, which may reduce gate drive circuit power consumption.

Q: Do both parts meet the same compliance standards?

A: Yes. Both SK055NTP and TN1625-1000G-TR are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating. Both operate across -40°C to 125°C temperature range.

Q: What is the primary difference in electrical performance?

A: The primary difference is current rating: SK055NTP handles 55 A RMS versus TN1625-1000G-TR at 16 A RMS. Secondary differences include lower on-state voltage drop (1.6 V vs. 1.8 V) and reduced off-state leakage current (5 µA vs. 30 µA) in the TN1625, which may provide efficiency benefits in lower-current applications.

Q: Can I use SK055NTP in place of TN1625-1000G-TR?

A: Yes. The SK055NTP is a higher-rated device and is electrically compatible with circuits designed for the TN1625-1000G-TR. No circuit modifications are required.

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