MP8042DF-LF-Z Equivalent & Substitute Parts

Part Overview

The MP8042DF-LF-Z is a half bridge driver IC manufactured by Monolithic Power Systems, 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 functions. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

MP8042DF-LF-Z

Monolithic Power SystemsIn Stock: 37914MP8042DF-LF-Z 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-Z is determined by the following critical parameters:

Primary Substitution Criteria:

• Output Configuration: Half Bridge (2)
• Interface: PWM
• Load Type: Inductive
• Technology: Power MOSFET
• Package / Case: 20-TSSOP with Exposed Pad
• Peak Output Current: 5A
• Operating Temperature Range: -40°C ~ 125°C (TJ)
• Compliance: ROHS3, MSL 2A

Acceptable Parameter Variations:

• Supply Voltage Range: May extend beyond 7.5V ~ 24V (upward compatible)
• Load Voltage Range: May extend beyond 7.5V ~ 24V (upward compatible)
• Rds On (Typ): Minor variations acceptable within power dissipation constraints

The MP8046DF-LF-P qualifies as a direct substitute based on matching output configuration, interface, load type, technology, package, current rating, and temperature range. The supply and load voltage ranges are extended (7.5V ~ 28V), providing broader application compatibility.

The MP8046DF-LF-Z does not qualify as a functional substitute. Although it shares the same package and base product number, it is categorized as a Class D Amplifier IC with 2-Channel (Stereo) output type, representing a fundamentally different functional application incompatible with half bridge driver requirements.

Parameter Comparison

Engineering Selection Recommendations

MP8046DF-LF-P is the qualified substitute for MP8042DF-LF-Z applications. This part maintains functional equivalence across all critical parameters: half bridge driver topology, PWM interface, inductive load support, 5A peak output current, and identical thermal operating range. The extended supply and load voltage specifications (7.5V ~ 28V versus 7.5V ~ 24V) provide enhanced design flexibility without compromising compatibility. Both parts carry ROHS3 compliance and identical MSL ratings, ensuring equivalent environmental and handling requirements. The MP8046DF-LF-P is currently in active production status, providing long-term availability and supply chain stability compared to the obsolete MP8042DF-LF-Z.

MP8046DF-LF-Z is not suitable as a substitute. Despite sharing identical packaging and base product number, this device is functionally distinct—classified as a Class D Amplifier IC for stereo audio applications rather than a power management half bridge driver. Functional incompatibility precludes its use in half bridge driver circuits.

Frequently Asked Questions (FAQ)

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

A: Yes. Both devices share identical output configuration (half bridge), interface (PWM), load type (inductive), technology (power MOSFET), package (20-TSSOP with exposed pad), peak output current (5A), and operating temperature range (-40°C ~ 125°C). The extended voltage specifications of MP8046DF-LF-P are backward compatible with MP8042DF-LF-Z applications.

Q: What is the difference between MP8046DF-LF-P and MP8046DF-LF-Z?

A: These are distinct products despite sharing the same base part number. MP8046DF-LF-P is a half bridge driver (Power Management category), while MP8046DF-LF-Z is a Class D stereo amplifier (Linear, Amplifiers category). They are not interchangeable.

Q: Are there packaging differences between MP8042DF-LF-Z and MP8046DF-LF-P?

A: Both parts use identical packaging: 20-TSSOP (0.173", 4.40mm Width) with exposed pad. Mounting type is surface mount for both devices. No PCB layout modifications are required for substitution.

Q: What is the significance of the Rds On difference (150mOhm vs 165mOhm)?

A: The MP8046DF-LF-P exhibits slightly higher on-resistance (165mOhm) compared to MP8042DF-LF-Z (150mOhm). This results in marginally increased power dissipation under identical load conditions. Thermal design margins should be verified for applications operating at maximum current and temperature extremes.

Q: Are compliance certifications identical between the main part and substitute?

A: Yes. Both MP8042DF-LF-Z and MP8046DF-LF-P carry ROHS3 compliance, identical MSL rating (2A, 4 Weeks), and REACH unaffected status. No compliance-related design changes are required.

Q: Why is MP8042DF-LF-Z classified as obsolete?

A: Product status reflects manufacturer lifecycle decisions. MP8046DF-LF-P is the active replacement, offering equivalent functionality with extended voltage specifications and ongoing production support.