LM5109AMAX Half-Bridge Gate Driver IC Equivalent & Substitute Parts

Part Overview

The LM5109AMAX 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 1A peak output current for both source and sink operations. The LM5109AMAX is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain identical electrical characteristics, package specifications, and functional performance to ensure direct compatibility in existing circuit designs.

Substiute Parts

LM5109AMAX

Texas InstrumentsIn Stock: 25444LM5109AMAX Datasheet

Current PartRFQ

LM5109AMAX/NOPB

National SemiconductorIn Stock: 22966LM5109AMAX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM5109AMAX are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution criteria are:

• Driven Configuration: Half-Bridge topology
• Number of Drivers: 2 independent channels
• Gate Type: N-Channel MOSFET driving capability
• Supply Voltage Range: 8V ~ 14V
• Peak Output Current: 1A source and 1A sink
• Logic Input Levels: VIL 0.8V, VIH 2.2V
• Input Configuration: Non-Inverting
• Bootstrap Voltage Rating: 108V maximum
• Switching Speed: 15ns rise and fall times
• Temperature Range: -40°C to 125°C junction temperature
• Package Type: 8-SOIC surface mount with 3.90mm width

The LM5109AMAX/NOPB variant qualifies as a direct substitute, maintaining identical electrical specifications and package configuration while offering active product status.

Parameter Comparison

Engineering Selection Recommendations

The LM5109AMAX/NOPB is a direct functional equivalent suitable for replacing the obsolete LM5109AMAX. Both parts share identical electrical specifications, package configuration, and performance characteristics. The primary distinction is product status: the LM5109AMAX/NOPB maintains active availability, providing supply chain continuity for new designs and production requirements.

Both parts comply with EAR99 export classification and fall under HTSUS code 8542.39.0001. The LM5109AMAX is RoHS non-compliant, while compliance status for the LM5109AMAX/NOPB is not specified in the provided data. For applications requiring RoHS compliance, additional verification with the manufacturer is necessary.

Selection between these parts should be based on availability and supply chain requirements, as electrical and mechanical compatibility is complete.

Frequently Asked Questions (FAQ)

Q: Can the LM5109AMAX/NOPB directly replace the LM5109AMAX in existing designs?

A: Yes. Both parts are electrically and mechanically identical. The LM5109AMAX/NOPB maintains the same supply voltage range (8V ~ 14V), peak output current (1A source/sink), logic input levels (0.8V/2.2V), bootstrap voltage rating (108V), switching characteristics (15ns rise/fall time), and 8-SOIC package configuration. No circuit modifications are required.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB designation indicates a lead-free, RoHS-compliant packaging variant. This affects soldering processes and thermal characteristics but does not alter electrical functionality or pin compatibility.

Q: Are there any temperature or environmental differences between these parts?

A: Both parts operate across the identical temperature range of -40°C to 125°C junction temperature. No environmental performance differences exist between the two variants.

Q: What is the package footprint compatibility?

A: Both parts use the 8-SOIC package with 0.154" (3.90mm) width. PCB layouts and footprints are directly compatible without modification.

Q: Why is the LM5109AMAX classified as obsolete?

A: Obsolescence typically results from manufacturer discontinuation decisions. The LM5109AMAX/NOPB remains in active production, making it the recommended choice for ongoing applications.

Q: Are there compliance or certification differences?

A: Both parts share EAR99 export classification and HTSUS code 8542.39.0001. RoHS compliance status differs: the LM5109AMAX is explicitly non-compliant, while the LM5109AMAX/NOPB status requires manufacturer verification for specific applications.