LM5109BMAX Half-Bridge Gate Driver IC Equivalent & Substitute Parts

Part Overview

The LM5109BMAX is a half-bridge gate driver IC manufactured by Texas Instruments, designed for driving N-Channel MOSFETs in half-bridge configurations. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The LM5109BMAX operates with a supply voltage range of 8V to 14V and delivers 1A peak output current on both source and sink channels, making it suitable for moderate-power switching applications.

Substiute Parts

LM5109BMAX

Texas InstrumentsIn Stock: 30148LM5109BMAX Datasheet

Current PartRFQ

LM5109BMAX/NOPB

Texas InstrumentsIn Stock: 65388LM5109BMAX/NOPB Datasheet

DirectRFQ

NCP5109BDR2G

onsemiIn Stock: 47851NCP5109BDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM5109BMAX is determined by strict equivalence across the following critical parameters: half-bridge driven configuration, independent dual-channel topology, N-Channel MOSFET gate type, non-inverting input logic, 8-SOIC package form factor, and operating temperature range of -40°C to 125°C.

The substitute parts are grouped into two categories:

Direct Equivalent (Same Manufacturer): LM5109BMAX/NOPB maintains identical electrical specifications and differs only in packaging format (Cut Tape & Digi-Reel versus standard packaging) and product status (Active versus Obsolete). This part is a direct pin-for-pin and functionally equivalent replacement.

Cross-Manufacturer Substitute (Manufacturer Recommended): NCP5109BDR2G from onsemi provides half-bridge gate driver functionality in the same 8-SOIC package with compatible operating temperature range. However, this part exhibits parameter variations in supply voltage range, peak output current, bootstrap voltage rating, and switching speed characteristics, requiring design verification for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: LM5109BMAX/NOPB is the preferred substitute when sourcing active inventory. This part maintains 100% electrical and functional equivalence to the obsolete LM5109BMAX while offering ROHS3 compliance and active product status. The packaging format difference (Cut Tape & Digi-Reel versus standard) does not affect electrical performance or PCB integration.

For Cross-Manufacturer Substitution: NCP5109BDR2G from onsemi is suitable only when application requirements accommodate the following parameter deviations: higher supply voltage range (10V ~ 20V versus 8V ~ 14V), reduced peak output current (250mA source, 500mA sink versus 1A symmetric), extended bootstrap voltage capability (200V versus 108V), and slower switching characteristics (85ns rise time, 35ns fall time versus 15ns symmetric). This part also supports IGBT gate driving in addition to N-Channel MOSFETs. Both substitute parts maintain ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can LM5109BMAX/NOPB be used as a direct replacement for LM5109BMAX?

A: Yes. LM5109BMAX/NOPB is electrically and functionally identical to LM5109BMAX. The only differences are packaging format (Cut Tape & Digi-Reel) and product status (Active). No circuit modifications are required.

Q: What are the key differences between LM5109BMAX and NCP5109BDR2G?

A: The NCP5109BDR2G differs in four critical areas: supply voltage range (10V ~ 20V versus 8V ~ 14V), peak output current (250mA/500mA versus 1A/1A), bootstrap voltage rating (200V versus 108V), and switching speed (85ns/35ns versus 15ns/15ns). These differences may impact circuit performance and require design verification.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All three parts use the 8-SOIC package with identical pin spacing (0.154", 3.90mm width), allowing direct PCB footprint compatibility. However, electrical parameter differences may require circuit design adjustments.

Q: What is the significance of the packaging format differences?

A: Packaging format (standard, Cut Tape & Digi-Reel, or Tape & Reel) affects supply chain logistics and handling but does not impact electrical performance or PCB integration. Selection depends on procurement and assembly requirements.

Q: Why is NCP5109BDR2G rated for higher bootstrap voltage?

A: The NCP5109BDR2G supports both IGBT and N-Channel MOSFET gate driving, which requires higher voltage capability. Applications using only N-Channel MOSFETs do not require this extended rating.

Q: Are there RoHS compliance considerations for substitution?

A: LM5109BMAX is RoHS non-compliant, while both LM5109BMAX/NOPB and NCP5109BDR2G are ROHS3 compliant. For new designs or applications with RoHS requirements, either substitute part is suitable.