LM2575-5.0BU TR Equivalent & Substitute Parts

Part Overview

The LM2575-5.0BU TR is a buck switching regulator IC manufactured by Microchip Technology, delivering a fixed 5V output at 1A with input voltage range of 4V to 40V. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and production continuity. The TO-263-6 D2PAK package with 5 leads and tab provides surface mount integration for compact power management applications.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Fixed 5V
Number of Outputs	1
Voltage - Input (Min)	4V
Voltage - Input (Max)	40V
Current - Output	1A
Frequency - Switching	52kHz
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LM2575-5.0BU TR is determined by the following critical parameters:

Topology & Function: Buck switching regulator with step-down configuration
Output Specification: Fixed 5V positive output
Package Compatibility: TO-263-6 D2PAK (5 Leads + Tab) surface mount
Input Voltage Range: Minimum 4V to maximum 40V
Output Current Capability: 1A or higher
Switching Frequency: 52kHz or higher
Operating Temperature Range: -40°C to 125°C or compatible subset
RoHS Compliance: Modern alternatives are ROHS3 compliant

Substitute parts are grouped into two categories: direct pin-compatible replacements with identical 1A output current, and higher-current alternatives (2A and 3A) that provide enhanced performance headroom while maintaining package and functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min/Max)	Switching Frequency	Operating Temperature	Package	Product Status	RoHS Status
LM2575-5.0BU TR	Microchip Technology	1A	4V / 40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Obsolete	RoHS non-compliant
LM2575-5.0WU-TR	Microchip Technology	1A	4V / 40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active	ROHS3 Compliant
TL2575-05IKTTR	Texas Instruments	1A	4.75V / 40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active	ROHS3 Compliant
TL2575-05IKTTRG3	Texas Instruments	1A	4.75V / 40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active	ROHS3 Compliant
NCV2575D2T-5R4G	onsemi	1A	4.75V / 40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Obsolete	ROHS3 Compliant
AP1506-50K5G-13	Diodes Incorporated	3A	4.5V / 22V	150kHz	-20°C ~ 85°C	TO-263-6 D2PAK	Last Time Buy	ROHS3 Compliant
LM2592HVS-5.0/NOPB	Texas Instruments	2A	4.5V / 60V	150kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active	ROHS3 Compliant
LM2592HVSX-5.0/NOPB	Texas Instruments	2A	4.5V / 60V	150kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active	ROHS3 Compliant
LM2596S-5.0/NOPB	Texas Instruments	3A	4.5V / 40V	150kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active	ROHS3 Compliant
LM2596SX-5.0/NOPB	Texas Instruments	3A	4.5V / 40V	150kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (1A Output Current)

LM2575-5.0WU-TR is the primary direct replacement for LM2575-5.0BU TR. Both parts are manufactured by Microchip Technology, share identical electrical specifications (1A output, 4V to 40V input, 52kHz switching frequency, -40°C to 125°C operating range), and use the same TO-263-6 D2PAK package. The LM2575-5.0WU-TR is active in production and ROHS3 compliant, addressing the obsolescence and compliance limitations of the original part.

TL2575-05IKTTR and TL2575-05IKTTRG3 from Texas Instruments provide equivalent 1A output performance with identical switching frequency and operating temperature range. Both are active products with ROHS3 compliance. The input voltage minimum is specified at 4.75V compared to 4V for the original part, which is acceptable for most applications with adequate input voltage margin.

Higher Current Alternatives (2A and 3A Output)

LM2592HVS-5.0/NOPB and LM2592HVSX-5.0/NOPB deliver 2A output current while maintaining the same 5V fixed output, TO-263-6 D2PAK package, and -40°C to 125°C operating temperature. These parts support extended input voltage range up to 60V and operate at 150kHz switching frequency. Both are active products with ROHS3 compliance.

LM2596S-5.0/NOPB and LM2596SX-5.0/NOPB provide 3A output current with the same package and operating temperature specifications. Input voltage range extends to 40V maximum, matching the original part specification. Both are active products with ROHS3 compliance and 150kHz switching frequency.

AP1506-50K5G-13 from Diodes Incorporated offers 3A output current in the same package with 150kHz switching frequency and ROHS3 compliance. This part is designated Last Time Buy status. Input voltage range is 4.5V to 22V, which is narrower than the original specification and requires verification for specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a higher current rated part (2A or 3A) as a direct replacement for the 1A LM2575-5.0BU TR?

A: Yes. Higher current rated parts maintain the same 5V fixed output, TO-263-6 D2PAK package, and pin configuration. The increased current capability provides design margin and does not create compatibility issues. Thermal management and PCB layout should be evaluated for the specific application.

Q: What is the minimum input voltage requirement for substitute parts?

A: The original LM2575-5.0BU TR specifies 4V minimum input voltage. Direct replacements TL2575-05IKTTR and TL2575-05IKTTRG3 specify 4.75V minimum. Higher current alternatives (LM2592 and LM2596 series) specify 4.5V minimum. Verify that your application input voltage exceeds the selected part's minimum specification.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except the original LM2575-5.0BU TR, which is RoHS non-compliant. This compliance improvement is a key advantage of transitioning to active production alternatives.

Q: What is the difference between TL2575-05IKTTR and TL2575-05IKTTRG3?

A: Both parts are functionally identical with 1A output, 52kHz switching frequency, and -40°C to 125°C operating temperature. The primary difference is packaging: TL2575-05IKTTR is supplied in Cut Tape (CT) & Digi-Reel format, while TL2575-05IKTTRG3 is supplied in Tape & Reel (TR) format. Select based on your procurement and assembly requirements.

Q: Why do some substitute parts have higher switching frequency (150kHz vs 52kHz)?

A: Higher switching frequency reduces the size of external filter components and improves transient response. The 150kHz switching frequency in LM2592 and LM2596 series parts is a design improvement that does not affect pin compatibility or basic functional operation. Existing PCB designs may require component value adjustments for optimal performance.

Q: Is the NCV2575D2T-5R4G a viable substitute despite being obsolete?

A: NCV2575D2T-5R4G from onsemi is functionally equivalent with 1A output, 52kHz switching frequency, and identical operating temperature range. However, it is classified as obsolete, which presents the same long-term supply risk as the original LM2575-5.0BU TR. Active production alternatives are recommended for new designs.

Q: What is the maximum input voltage for each substitute part?

A: LM2575-5.0WU-TR and TL2575 series: 40V maximum. AP1506-50K5G-13: 22V maximum. LM2592 series: 60V maximum. LM2596 series: 40V maximum. Verify that your application input voltage does not exceed the selected part's maximum specification.

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