LM5105SD Half-Bridge Gate Driver IC Equivalent & Substitute Parts

Part Overview

The LM5105SD is a half-bridge gate driver IC manufactured by Texas Instruments, designed for driving N-channel MOSFETs in synchronous half-bridge configurations. This device operates with a supply voltage range of 8V to 14V and delivers peak output currents of 1.8A for both source and sink operations. The LM5105SD is classified as obsolete, which necessitates identification of active equivalent parts to ensure design continuity and procurement availability for new production runs and system maintenance.

Substiute Parts

LM5105SD

Texas InstrumentsIn Stock: 1943LM5105SD Datasheet

Current PartRFQ

LM5105SD/NOPB

Texas InstrumentsIn Stock: 17376LM5105SD/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM5105SD is determined by strict equivalence across the following critical parameters:

• Driven Configuration: Half-Bridge topology
• Channel Type: Synchronous operation
• Number of Drivers: 2-channel configuration
• Gate Type: N-Channel MOSFET driver capability
• Voltage - Supply: 8V ~ 14V operating range
• Logic Voltage Levels: VIL 0.8V, VIH 2.2V
• Current - Peak Output: 1.8A source and sink capability
• Input Type: Non-Inverting logic
• High Side Voltage - Max (Bootstrap): 118 V maximum
• Rise / Fall Time: 15ns typical for both edges
• Operating Temperature Range: -40°C ~ 125°C (TJ)
• Package / Case: 10-WDFN Exposed Pad
• Supplier Device Package: 10-WSON (4x4)
• Mounting Type: Surface Mount

Parts meeting all these parameters are classified as direct substitutes. The LM5105SD/NOPB variant maintains identical electrical and mechanical specifications while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LM5105SD/NOPB is the direct functional equivalent of the LM5105SD. Both parts share identical electrical performance characteristics and mechanical packaging specifications. The primary distinction lies in product status and regulatory compliance:

• LM5105SD: Obsolete status with RoHS non-compliant certification
• LM5105SD/NOPB: Active product status with ROHS3 compliance

For new designs and production applications, the LM5105SD/NOPB is the appropriate selection due to its active product status and ROHS3 compliance certification. This variant ensures long-term supply chain availability and alignment with current regulatory requirements. Both parts are functionally interchangeable at the circuit level, with identical pin configurations, electrical ratings, and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can the LM5105SD/NOPB be used as a direct replacement for the LM5105SD?

A: Yes. The LM5105SD/NOPB is a direct substitute. Both parts are identical in electrical specifications, output drive capability, logic voltage levels, and package configuration. The primary difference is product status and RoHS compliance.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix designates a part without plumbum (lead-free) processing and indicates the part meets ROHS3 compliance standards. This is a standard Texas Instruments designation for RoHS-compliant variants.

Q: Are there any differences in pin configuration between these parts?

A: No. Both the LM5105SD and LM5105SD/NOPB use the identical 10-WSON (4x4) package with 10-WDFN Exposed Pad configuration. Pin-to-pin compatibility is guaranteed.

Q: Why is the LM5105SD classified as obsolete?

A: The LM5105SD has been superseded by the LM5105SD/NOPB variant. Texas Instruments transitioned to the NOPB version to meet current RoHS3 compliance requirements and regulatory standards.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. The LM5105SD/NOPB maintains full electrical and mechanical compatibility with the LM5105SD. No circuit modifications or PCB layout changes are required for substitution.

Q: What is the bootstrap voltage rating, and does it apply to both parts?

A: Both parts support a maximum bootstrap voltage of 118 V. This rating applies to the high-side gate driver channel in half-bridge configurations.

Q: Are there any thermal or operating temperature differences?

A: No. Both parts operate across the identical temperature range of -40°C to 125°C (junction temperature). Thermal characteristics and derating curves are equivalent.