MP8042DF-LF Equivalent & Substitute Parts

Part Overview

The MP8042DF-LF is a half bridge driver IC manufactured by Monolithic Power Systems Inc., designed for general purpose power MOSFET applications. This device features PWM interface control, inductive load capability, and integrated fault protection including current limiting, over-temperature, and UVLO (Under-Voltage Lock-Out) functions. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Substitute parts must maintain functional equivalence in half bridge driver topology while meeting the electrical and mechanical constraints of the original application.

Substiute Parts

MP8042DF-LF

Monolithic Power Systems Inc.In Stock: 753MP8042DF-LF Datasheet

Current PartRFQ

MP8046DF-LF-P

Monolithic Power Systems Inc.In Stock: 1129MP8046DF-LF-P Datasheet

DirectRFQ

MP8046DF-LF-Z

Monolithic Power Systems Inc.In Stock: 25112MP8046DF-LF-Z Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP8042DF-LF is determined by the following critical parameters:

Functional Requirements:

• Output Configuration: Half Bridge (2) topology
• Interface: PWM control
• Load Type: Inductive load support
• Technology: Power MOSFET driver

Electrical Compatibility:

• Peak Output Current: 5A minimum
• Supply Voltage Range: Must encompass or exceed 7.5V ~ 24V
• Load Voltage Range: Must encompass or exceed 7.5V ~ 24V
• Operating Temperature: -40°C ~ 125°C (TJ)

Physical & Environmental:

• Package: 20-TSSOP with Exposed Pad (20-TSSOPF-EP)
• Mounting: Surface Mount
• Compliance: ROHS3, MSL 2A (4 Weeks)

Protection Features:

• Fault Protection: Current Limiting, Over Temperature, UVLO
• Status Flag capability

The MP8046DF-LF-P qualifies as a direct functional substitute, maintaining identical output configuration, interface, load type, and protection features while supporting an extended supply voltage range (7.5V ~ 28V). The MP8046DF-LF-Z does not qualify as a substitute due to functional category mismatch (Class D Amplifier vs. Half Bridge Driver).

Parameter Comparison

Engineering Selection Recommendations

MP8046DF-LF-P is the qualified substitute for MP8042DF-LF applications. Selection rationale:

• Functional Equivalence: Identical half bridge driver topology, PWM interface, and inductive load support
• Electrical Compatibility: Peak output current (5A) and operating temperature range (-40°C ~ 125°C) match original specifications; extended supply voltage range (7.5V ~ 28V) provides broader application flexibility
• Package Compatibility: Identical 20-TSSOP with exposed pad footprint ensures direct PCB layout compatibility
• Compliance Alignment: Both parts maintain ROHS3 compliance and identical MSL rating (2A, 4 Weeks)
• Product Status: MP8046DF-LF-P is active production, ensuring long-term availability and supply chain continuity
• Packaging Format: Tape & Reel (TR) packaging supports automated assembly processes

The minor increase in Rds On (165mOhm vs. 150mOhm) represents a 10% rise in on-state resistance and must be evaluated against thermal and efficiency requirements of the specific application circuit.

Frequently Asked Questions (FAQ)

Q: Can MP8046DF-LF-P directly replace MP8042DF-LF in existing designs?

A: Yes. Both devices share identical output configuration (half bridge), interface (PWM), load type (inductive), package (20-TSSOP-EP), and fault protection features. PCB layout and pinout compatibility is maintained. The extended supply voltage range of MP8046DF-LF-P (7.5V ~ 28V vs. 7.5V ~ 24V) does not create incompatibility for applications within the original 7.5V ~ 24V specification.

Q: What is the significance of the Rds On difference between MP8042DF-LF and MP8046DF-LF-P?

A: Rds On (on-state resistance) affects power dissipation and thermal performance. MP8046DF-LF-P exhibits 165mOhm vs. MP8042DF-LF at 150mOhm. For a 5A peak output current, this represents approximately 4.125W vs. 3.75W dissipation differential. Thermal analysis of the specific application circuit is required to confirm acceptability.

Q: Why is MP8046DF-LF-Z not listed as a substitute?

A: MP8046DF-LF-Z is a Class D stereo amplifier IC, not a half bridge driver. Despite sharing the same package (20-TSSOP-EP) and base product number (MP8046), it serves a fundamentally different functional category and does not meet the power management driver requirements of the original application.

Q: Are there packaging format considerations when substituting MP8042DF-LF with MP8046DF-LF-P?

A: MP8046DF-LF-P is supplied in Tape & Reel (TR) format, suitable for automated pick-and-place assembly. The original MP8042DF-LF packaging format is not specified in available data. Confirm that TR packaging is compatible with your assembly process requirements.

Q: What compliance certifications apply to both parts?

A: Both MP8042DF-LF and MP8046DF-LF-P are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity level (MSL 2A, 4 Weeks). No compliance barriers exist for substitution.