MPQ2451DT-LF-Z Equivalent & Substitute Parts

Part Overview

The MPQ2451DT-LF-Z is a buck switching regulator IC from Monolithic Power Systems Inc., designed for step-down voltage conversion with positive adjustable output. This device operates across a wide input voltage range of 3.3V to 36V and delivers up to 600mA output current with a fixed output voltage of 0.8V minimum and 32.4V maximum adjustable range. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support existing production requirements.

Substiute Parts

MPQ2451DT-LF-Z

Monolithic Power Systems Inc.In Stock: 1598MPQ2451DT-LF-Z Datasheet

Current PartRFQ

MPQ2451DJ-LF-Z

Monolithic Power Systems Inc.In Stock: 1077MPQ2451DJ-LF-Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPQ2451DT-LF-Z is determined by strict alignment of the following critical parameters:

• Manufacturer & Base Product Number: Both the main part and substitute must originate from Monolithic Power Systems Inc. and share the base product number MPQ2451 to ensure functional equivalence.
• Topology & Function: Buck switching regulator topology with step-down conversion capability.
• Output Characteristics: Positive adjustable output configuration with identical voltage range (0.8V to 32.4V) and current rating (600mA).
• Electrical Specifications: Input voltage range (3.3V to 36V), switching frequency (2MHz), and operating temperature range (-40°C to 125°C).
• Package Compatibility: Surface mount packaging in SOT-23-6 form factor, including thin variants (TSOT-23-6).
• Compliance & Certifications: ROHS3 compliance, MSL Level 1, and REACH unaffected status.

The MPQ2451DJ-LF-Z qualifies as a direct substitute based on these parameters while offering improved product status (Active vs. Not For New Designs).

Parameter Comparison

Engineering Selection Recommendations

The MPQ2451DJ-LF-Z is the qualified substitute for the MPQ2451DT-LF-Z based on the following engineering criteria:

Product Status Advantage: The substitute part carries Active product status, ensuring long-term availability and continued manufacturer support, whereas the main part is designated "Not For New Designs" and subject to discontinuation.

Compliance & Certification Alignment: Both parts maintain identical ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status, ensuring regulatory and environmental requirements are met without modification.

Electrical & Functional Equivalence: All critical electrical parameters—input voltage range, output voltage adjustability, current capacity, switching frequency, and operating temperature—are identical between the two parts, enabling direct functional substitution in existing circuit designs.

Package Form Factor: While the substitute uses a thin variant package (TSOT-23-6), it maintains the same SOT-23-6 pinout and surface mount compatibility, allowing PCB-level integration without redesign.

Frequently Asked Questions (FAQ)

Q: Can the MPQ2451DJ-LF-Z be used as a direct replacement for the MPQ2451DT-LF-Z?

A: Yes. Both parts share identical electrical specifications, output characteristics, and pinout configuration. The substitute is functionally equivalent and can be used in existing designs without circuit modification.

Q: What is the difference between SOT-23-6 and TSOT-23-6 packaging?

A: TSOT-23-6 is a thin variant of the SOT-23-6 package. Both maintain the same pinout and footprint compatibility for surface mount assembly. The thin variant may offer reduced height for space-constrained applications.

Q: Why is the main part marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status and is no longer recommended for new product development. The substitute part with Active status should be used for ongoing and future designs.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts maintain identical ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status. No additional qualification or testing is required for substitution.

Q: What is the inventory status of the substitute part?

A: The MPQ2451DJ-LF-Z has 1030 pieces in stock as new original inventory, providing adequate supply for production requirements.