LM5109BSD Equivalent & Substitute Parts

Part Overview

The LM5109BSD is a half-bridge gate driver IC manufactured by Texas Instruments, designed for driving N-Channel MOSFETs in half-bridge configurations. This device operates with a supply voltage range of 8V to 14V and delivers peak output currents of 1A for both source and sink operations. The LM5109BSD is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

LM5109BSD

Texas InstrumentsIn Stock: 1909LM5109BSD Datasheet

Current PartRFQ

LM5109BSD/NOPB

Texas InstrumentsIn Stock: 35309LM5109BSD/NOPB Datasheet

DirectRFQ

NCP5109BDR2G

onsemiIn Stock: 47851NCP5109BDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM5109BSD are identified based on functional equivalence within the half-bridge gate driver category. The critical parameters determining substitution eligibility are:

• Driven configuration (half-bridge topology)
• Number of independent driver channels (2 channels)
• Gate type compatibility (N-Channel MOSFET or IGBT capable)
• Supply voltage range capability
• Peak output current specifications
• Bootstrap voltage rating
• Operating temperature range
• Package compatibility or functional equivalence

Two substitute parts are identified: LM5109BSD/NOPB (direct Texas Instruments variant) and NCP5109BDR2G (onsemi alternative). The LM5109BSD/NOPB maintains identical electrical specifications and package format, differing only in packaging configuration (Tape & Reel) and product status (Active). The NCP5109BDR2G represents a cross-manufacturer alternative with modified electrical characteristics suitable for similar applications.

Parameter Comparison

Engineering Selection Recommendations

LM5109BSD/NOPB is the primary substitute for the obsolete LM5109BSD. This part maintains identical electrical specifications, supply voltage range, output current ratings, and package format. The LM5109BSD/NOPB is classified as Active product status with ROHS3 compliance, providing long-term availability and regulatory alignment for new designs and production continuity.

NCP5109BDR2G is a cross-manufacturer alternative suitable for applications where the modified electrical characteristics are acceptable. This part operates with an extended supply voltage range (10V ~ 20V) and higher bootstrap voltage rating (200V), making it applicable to higher-voltage system designs. However, the reduced peak output current (250mA source, 500mA sink) and slower switching times (85ns rise, 35ns fall) require circuit-level evaluation. The 8-SOIC package differs from the 8-WDFN format, necessitating PCB layout modifications. NCP5109BDR2G is Active status with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can LM5109BSD/NOPB be used as a direct replacement for LM5109BSD?

A: Yes. LM5109BSD/NOPB is electrically and functionally identical to LM5109BSD. Both parts share the same supply voltage range (8V ~ 14V), output current specifications (1A source/sink), bootstrap voltage rating (108V), and switching characteristics (15ns rise/fall time). The primary difference is packaging configuration (Tape & Reel vs. bulk) and product status (Active vs. Obsolete). PCB layout compatibility is maintained.

Q: What are the limitations of NCP5109BDR2G as a substitute?

A: NCP5109BDR2G introduces three key differences: (1) Reduced peak output current—250mA source and 500mA sink versus 1A for both on the LM5109BSD, which may limit gate drive capability for high-frequency or large-capacitance gate loads; (2) Slower switching times—85ns rise and 35ns fall versus 15ns for both on the LM5109BSD, affecting switching speed and efficiency; (3) Different package format—8-SOIC versus 8-WDFN, requiring PCB redesign. The extended supply voltage range (10V ~ 20V) and higher bootstrap voltage (200V) are advantages for higher-voltage applications.

Q: Are there package compatibility concerns between these substitutes?

A: LM5109BSD and LM5109BSD/NOPB use identical 8-WDFN Exposed Pad packaging, ensuring direct PCB compatibility. NCP5109BDR2G uses 8-SOIC packaging, which has different pin spacing and footprint dimensions. Designs using NCP5109BDR2G require PCB layout modifications and new footprint implementation.

Q: What compliance certifications apply to these parts?

A: LM5109BSD carries RoHS non-compliant status. LM5109BSD/NOPB and NCP5109BDR2G are both ROHS3 compliant. All three parts are REACH Unaffected and classified under ECCN EAR99. For applications requiring RoHS compliance, LM5109BSD/NOPB or NCP5109BDR2G must be selected.

Q: Which substitute is recommended for new designs?

A: LM5109BSD/NOPB is the recommended substitute for new designs requiring direct functional equivalence. This part maintains all electrical specifications of the original LM5109BSD while offering Active product status and ROHS3 compliance. NCP5109BDR2G is suitable only when the extended supply voltage range and higher bootstrap voltage are required, and when the reduced output current and slower switching times are acceptable for the application.