BTS149NKSA1 Equivalent & Substitute Parts

Part Overview

The BTS149NKSA1 is an N-Channel power switch manufactured by Infineon Technologies, designed for general-purpose low-side switching applications. This device features a 1:1 input-to-output ratio with a maximum output current of 19A and operates across a temperature range of -40°C to 150°C. The component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional and electrical compatibility for new designs and production continuity.

Substiute Parts

BTS149NKSA1

Infineon TechnologiesIn Stock: 776BTS149NKSA1 Datasheet

Current PartRFQ

VNP20N07-E

STMicroelectronicsIn Stock: 1406VNP20N07-E Datasheet

MFR RecommendedRFQ

VNP35N07-E

STMicroelectronicsIn Stock: 364547VNP35N07-E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BTS149NKSA1 are selected based on the following core electrical and mechanical parameters:

• Output Configuration & Type: Low-side N-Channel switching topology
• Ratio - Input:Output: 1:1 configuration
• Package / Case: TO-220-3 form factor for direct pin compatibility
• Mounting Type: Through-hole technology
• Interface: On/Off control
• Fault Protection: Current limiting (fixed), over-temperature, and over-voltage protection
• Output Current Capability: Minimum 14A to accommodate the original 19A specification
• Load Voltage Rating: Minimum 55V to support the original 60V maximum

The identified substitutes—VNP20N07-E and VNP35N07-E from STMicroelectronics—satisfy these core requirements while offering active product status and modern compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

VNP20N07-E is suitable for applications where the original 19A output current specification can be reduced to 14A without functional impact. This substitute maintains active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. The lower on-resistance (50mOhm max) compared to the original 14mOhm typical value requires thermal analysis to confirm adequate heat dissipation in the target application.

VNP35N07-E provides higher current capability (25A) than the original specification, offering design margin for current-intensive applications. This part is recommended when increased output current headroom is beneficial or when thermal performance improvements are prioritized. The significantly higher on-resistance (280mOhm max) necessitates careful evaluation of power dissipation and thermal management requirements.

Both substitutes are manufactured by STMicroelectronics and carry active product status with ROHS3 compliance, supporting regulatory requirements for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can VNP20N07-E directly replace BTS149NKSA1 in all applications?

A: VNP20N07-E maintains identical package, pinout, and control interface compatibility. However, the reduced maximum output current (14A vs. 19A) and increased on-resistance require verification that the target application does not exceed these electrical limits.

Q: What is the primary difference between VNP20N07-E and VNP35N07-E?

A: The primary difference is output current capability: VNP20N07-E is rated for 14A maximum, while VNP35N07-E is rated for 25A maximum. The VNP35N07-E exhibits significantly higher on-resistance (280mOhm max vs. 50mOhm max), resulting in greater power dissipation at equivalent current levels.

Q: Are both substitutes pin-compatible with BTS149NKSA1?

A: Yes. Both VNP20N07-E and VNP35N07-E use the TO-220-3 package with identical pinout and through-hole mounting, enabling direct mechanical and electrical substitution without PCB redesign.

Q: Do the substitutes provide equivalent fault protection?

A: Yes. Both VNP20N07-E and VNP35N07-E include current limiting (fixed), over-temperature, and over-voltage protection, matching the protection features of BTS149NKSA1.

Q: What compliance certifications do the substitutes carry?

A: Both VNP20N07-E and VNP35N07-E are ROHS3 compliant and REACH unaffected, supporting modern regulatory requirements for electronic components.

Q: Which substitute should be selected for new designs?

A: Selection depends on application current requirements. For applications requiring 14A or less, VNP20N07-E is appropriate. For applications requiring higher current capability or design margin, VNP35N07-E is suitable. Thermal analysis is required for both options due to on-resistance differences from the original part.