LA5757TP-TL-E Equivalent & Substitute Parts

Part Overview

The LA5757TP-TL-E is a buck switching regulator IC manufactured by onsemi, designed for positive adjustable output applications with 1.6A switch current capability. This device operates across a wide input voltage range of 4.5V to 32V and delivers adjustable output from 1.255V to 32V. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LA5757TP-TL-E
Manufacturer	onsemi
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Adjustable
Voltage - Input (Min)	4.5V
Voltage - Input (Max)	32V
Voltage - Output (Min/Fixed)	1.255V
Voltage - Output (Max)	32V
Current - Output	1.6A (Switch)
Frequency - Switching	300kHz
Operating Temperature	-30°C ~ 125°C (TJ)
Package / Case	TO-252-5, DPAK (4 Leads + Tab), TO-252AD
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LA5757TP-TL-E is determined by alignment of the following critical parameters:

Topology: Buck (step-down) switching regulator
Output Configuration: Positive adjustable
Input Voltage Range: Minimum 4.5V support; maximum voltage tolerance ≥32V
Output Voltage Range: Adjustable minimum ≤1.255V; maximum ≥32V
Output Current: Minimum 1.6A capability
Switching Frequency: 300kHz nominal operation
Operating Temperature: Support for -30°C to 125°C range
Compliance: ROHS3 compliant, REACH unaffected, EAR99 classification
Mounting: Surface mount technology

Two substitute parts meet these criteria with varying trade-offs in package form factor, current capability, and functional scope.

Parameter Comparison

Parameter	LA5757TP-TL-E	LM2595DSADJR4G	LM25005MHX/NOPB
Manufacturer	onsemi	onsemi	Texas Instruments
Function	Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Down
Output Configuration	Positive	Positive or Negative	Positive
Topology	Buck	Buck, Boost, Buck-Boost	Buck
Output Type	Adjustable	Adjustable	Adjustable
Voltage - Input (Min)	4.5V	4.5V	7V
Voltage - Input (Max)	32V	40V	42V
Voltage - Output (Min/Fixed)	1.255V	1.23V	1.225V
Voltage - Output (Max)	32V	37V	37V
Current - Output	1.6A	1A	2.5A
Frequency - Switching	300kHz	150kHz	50kHz ~ 500kHz
Operating Temperature	-30°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-252-5, DPAK	TO-263-6, D2PAK	20-PowerTSSOP
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LM2595DSADJR4G (onsemi)

This substitute maintains onsemi manufacturer continuity and supports the full input voltage range of 4.5V to 40V. Output voltage adjustment range (1.23V to 37V) is compatible with the original specification. However, the maximum output current is limited to 1A, which is below the LA5757TP-TL-E rating of 1.6A. The LM2595 offers expanded topology flexibility with buck, boost, and buck-boost modes, and supports both positive and negative output configurations. Switching frequency is reduced to 150kHz. The D2PAK package differs from the original TO-252-5 DPAK form factor. This part is active and fully supported by the manufacturer.

LM25005MHX/NOPB (Texas Instruments)

This substitute provides the highest output current capability at 2.5A, exceeding the original 1.6A specification. Input voltage range extends to 42V maximum, and output voltage adjustment (1.225V to 37V) aligns with original requirements. The switching frequency range of 50kHz to 500kHz encompasses the original 300kHz operation point. Operating temperature range extends to -40°C minimum, providing broader environmental coverage. The 20-PowerTSSOP package represents a significant form factor change from the original TO-252-5 DPAK. This part is active and supported by Texas Instruments. Manufacturer change from onsemi to Texas Instruments introduces supply chain diversification.

Both substitutes maintain ROHS3 compliance, REACH unaffected status, and EAR99 classification. Selection between these options depends on output current requirements, package compatibility with existing PCB layouts, and supply chain preferences.

Frequently Asked Questions (FAQ)

Q: Can the LM2595DSADJR4G directly replace the LA5757TP-TL-E in all applications?

A: The LM2595DSADJR4G is functionally compatible for applications requiring output currents up to 1A. Applications demanding the full 1.6A output current of the original part require the LM25005MHX/NOPB. Package form factor differences (D2PAK versus TO-252-5 DPAK) necessitate PCB layout modifications.

Q: What are the package compatibility implications?

A: The LA5757TP-TL-E uses TO-252-5 DPAK (4 Leads + Tab). The LM2595DSADJR4G uses TO-263-6 D2PAK (5 Leads + Tab), and the LM25005MHX/NOPB uses 20-PowerTSSOP. Each package has different pin configurations, thermal characteristics, and PCB footprints. Direct socket replacement is not possible without PCB redesign.

Q: How do switching frequencies affect circuit design?

A: The LA5757TP-TL-E operates at 300kHz. The LM2595DSADJR4G operates at 150kHz, requiring larger output filter components. The LM25005MHX/NOPB supports 50kHz to 500kHz operation, allowing 300kHz selection for design continuity. Switching frequency impacts inductor and capacitor sizing, EMI characteristics, and efficiency.

Q: Are there temperature range differences?

A: The LA5757TP-TL-E operates from -30°C to 125°C. Both substitutes extend the minimum temperature to -40°C, providing broader environmental coverage. Maximum temperature remains 125°C for all three parts.

Q: What compliance certifications apply to all three parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level is 1 (unlimited) for all parts.

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