LA5774MP-DL-E Equivalent & Substitute Parts

Part Overview

The LA5774MP-DL-E is a buck switching regulator IC manufactured by onsemi, designed for positive adjustable output applications with 3.1A switch current capability. This device operates across a wide input voltage range of 4.5V to 28V and provides adjustable output from 1.26V to 28V. The component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

LA5774MP-DL-E

onsemiIn Stock: 785LA5774MP-DL-E Datasheet

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LM2596DSADJR4G

onsemiIn Stock: 19062LM2596DSADJR4G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LA5774MP-DL-E is determined by the following critical parameters:

• Input voltage range compatibility (minimum 4.5V, maximum ≥28V)
• Output voltage adjustability range (minimum ≤1.26V, maximum ≥28V)
• Output current capability (≥3.1A)
• Switching frequency (150kHz–160kHz range acceptable)
• Operating temperature range (-30°C to 125°C or broader)
• Surface mount packaging with compatible pinout
• Positive output configuration for buck topology

The LM2596DSADJR4G qualifies as a substitute based on these parameters. While it offers extended functionality (buck-boost capability) and higher maximum input voltage (40V), its core buck mode operation, adjustable positive output, and current rating (3A) satisfy the primary application requirements of the LA5774MP-DL-E.

Parameter Comparison

Engineering Selection Recommendations

The LM2596DSADJR4G is an active product with ROHS3 compliance, providing superior long-term availability compared to the obsolete LA5774MP-DL-E. The substitute meets all critical electrical parameters within acceptable tolerances for buck regulator applications.

Key considerations for selection:

• Output current: LM2596DSADJR4G provides 3A versus 3.1A on the original part. Applications requiring the full 3.1A specification may require thermal or circuit design review.
• Package transition: The substitute uses D2PAK (TO-263-6) versus DPAK (TO-252-6). PCB layout modifications are necessary; D2PAK offers improved thermal performance.
• Operating temperature: LM2596DSADJR4G extends the lower temperature limit to -40°C, providing broader environmental coverage.
• Compliance: ROHS3 certification on the substitute ensures regulatory alignment for new designs and production batches.

Frequently Asked Questions (FAQ)

Q: Can the LM2596DSADJR4G directly replace the LA5774MP-DL-E without PCB modifications?

A: No. The packages differ (D2PAK versus DPAK). PCB layout changes are required, including pad pattern and thermal via placement adjustments. Pin configuration compatibility must be verified against specific application schematics.

Q: What is the impact of the 0.1A current reduction (3A vs. 3.1A)?

A: For applications operating near the 3.1A limit, thermal analysis is required. The D2PAK package of the LM2596DSADJR4G provides superior thermal dissipation, potentially offsetting the lower rated current in many designs.

Q: Are there compatibility concerns with the adjustable output voltage range?

A: The LM2596DSADJR4G minimum output voltage (1.23V) is lower than the LA5774MP-DL-E (1.26V), and maximum output (37V) exceeds the original (28V). Both ranges encompass typical buck regulator applications. Feedback network design must be verified for specific output voltage requirements.

Q: Why does the substitute support buck-boost topology when only buck is needed?

A: The LM2596DSADJR4G is a multi-topology device. When configured for buck operation with positive output, it functions identically to the LA5774MP-DL-E for this application. The additional topology capability does not affect buck mode performance.

Q: What is the significance of the switching frequency difference (150kHz vs. 160kHz)?

A: The 10kHz difference is within acceptable tolerance for most applications. Output filter design may require minor adjustments to account for the lower frequency, but functional compatibility is maintained.

Q: Is the extended operating temperature range (-40°C vs. -30°C) beneficial?

A: Yes. The broader temperature range on the LM2596DSADJR4G provides additional design margin for applications in harsh environments and eliminates potential temperature-related failures at the lower specification limit.