LM5109ASDX Half-Bridge Gate Driver IC Equivalent & Substitute Parts

Part Overview

The LM5109ASDX 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 parts for new designs and ongoing production requirements. The LM5109ASDX operates with a supply voltage range of 8V to 14V and provides independent dual-channel gate driving with 1A peak output current capability on both source and sink paths.

Substiute Parts

LM5109ASDX

Texas InstrumentsIn Stock: 874LM5109ASDX Datasheet

Current PartRFQ

LM5109ASDX/NOPB

Texas InstrumentsIn Stock: 9336LM5109ASDX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM5109ASDX is determined by strict equivalence across the following critical parameters:

• Driven Configuration: Half-Bridge topology requirement
• Number of Drivers: Dual independent channels
• Gate Type: N-Channel MOSFET driving capability
• Voltage - Supply: 8V ~ 14V operating range
• Current - Peak Output: 1A source and 1A sink capability
• Input Type: Non-Inverting logic
• High Side Voltage - Max (Bootstrap): 108V maximum
• Package / Case: 8-WDFN Exposed Pad form factor
• Supplier Device Package: 8-WSON (4x4) pinout compatibility

The LM5109ASDX/NOPB variant qualifies as a direct substitute, maintaining identical electrical specifications and mechanical compatibility while offering active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LM5109ASDX/NOPB is the direct functional equivalent for applications currently using the LM5109ASDX. Both parts maintain identical electrical performance and mechanical compatibility. The primary distinction is product lifecycle status: the LM5109ASDX is obsolete, while the LM5109ASDX/NOPB is active and available in production quantities.

For new designs and ongoing production, the LM5109ASDX/NOPB is the appropriate selection. This variant provides ROHS3 compliance, addressing regulatory requirements for new product development. Both parts share identical supply voltage ranges, output current ratings, timing characteristics, and thermal operating limits, ensuring direct substitution without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the LM5109ASDX/NOPB replace the LM5109ASDX in existing designs?

A: Yes. The LM5109ASDX/NOPB is electrically and mechanically identical to the LM5109ASDX. Both devices operate with 8V to 14V supply voltage, deliver 1A peak output current on independent channels, and are packaged in 8-WSON (4x4) form factor. No circuit modifications are required.

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

A: The /NOPB designation indicates lead-free (Pb-free) packaging and RoHS3 compliance. This variant meets current environmental and regulatory standards for component manufacturing and distribution.

Q: Are the pin configurations identical between these parts?

A: Yes. Both the LM5109ASDX and LM5109ASDX/NOPB use the 8-WSON (4x4) pinout with exposed pad. PCB layouts and footprints are directly compatible.

Q: What is the bootstrap voltage rating, and why is it important?

A: The maximum bootstrap voltage is 108V. This rating defines the maximum high-side floating voltage that the gate driver can support. This parameter is critical for half-bridge applications where the high-side MOSFET gate voltage must be referenced to the switching node.

Q: Are there any compliance differences between the two parts?

A: The LM5109ASDX/NOPB is ROHS3 compliant, while the LM5109ASDX is RoHS non-compliant. Both maintain REACH Unaffected status. For new product development and regulated markets, the LM5109ASDX/NOPB is the appropriate choice.

Q: What is the Moisture Sensitivity Level (MSL), and what does it mean?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These devices can be stored and handled without special moisture control measures, simplifying supply chain management.