LM2575SX-5.0 Equivalent & Substitute Parts

Part Overview

The LM2575SX-5.0 is a buck switching regulator IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This device functions as a step-down converter delivering a fixed positive 5V output at 1A maximum current. The part operates across an input voltage range of 4V to 40V with a switching frequency of 52kHz and is housed in a TO-263-6 (D2PAK) surface mount package.

The LM2575SX-5.0 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute parts must maintain electrical compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Fixed
Output Voltage	5V
Output Current	1A
Input Voltage Range	4V to 40V
Switching Frequency	52kHz
Operating Temperature	-40°C to 125°C (TJ)
Package Type	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Synchronous Rectifier	No

Substitute Part Grouping Explanation

Substitution logic for the LM2575SX-5.0 is based on the following critical parameters:

Primary Compatibility Criteria:

Output voltage: 5V fixed
Output configuration: Positive
Package type: TO-263-6 (D2PAK with 5 leads + tab)
Topology: Buck switching regulator
Mounting type: Surface mount

Secondary Compatibility Criteria:

Input voltage range: Minimum 4V, maximum 40V
Operating temperature range: -40°C to 125°C
Switching frequency: 52kHz (preferred for circuit design consistency)

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (1A Output Current): Parts maintaining identical 1A output current specification with matching electrical characteristics and package configuration.

Category 2 - Higher Current Alternatives (3A Output Current): Parts with increased output current capability (3A or 5A) in the same package, suitable for designs requiring additional current margin or upgraded performance.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min)	Input Voltage (Max)	Switching Frequency	Operating Temperature	Package	Product Status	RoHS Status
LM2575SX-5.0	Texas Instruments	1A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Obsolete	Non-compliant
LM2575-5.0WU	Microchip Technology	1A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Active	ROHS3 Compliant
LM2575D2T-5G	onsemi	1A	4.75V	40V	52kHz	-40°C to 125°C	D2PAK-5	Active	ROHS3 Compliant
LM2575D2T-5R4G	onsemi	1A	4.75V	40V	52kHz	-40°C to 125°C	D2PAK-5	Active	ROHS3 Compliant
LM2576-5.0WU	Microchip Technology	3A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Active	ROHS3 Compliant
LM2576-5.0WU-TR	Microchip Technology	3A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Active	ROHS3 Compliant
LM2576D2T-005G	onsemi	3A	7V	40V	52kHz	-40°C to 125°C	D2PAK-5	Active	ROHS3 Compliant
LM2576D2TR4-5G	onsemi	3A	7V	40V	52kHz	-40°C to 125°C	D2PAK-5	Active	ROHS3 Compliant
AP1501-50K5G-13	Diodes Incorporated	3A	4.5V	40V	150kHz	-20°C to 85°C	TO-263-6	Active	ROHS3 Compliant
AP1501A-50K5G-13	Diodes Incorporated	5A	4.5V	40V	150kHz	-20°C to 85°C	TO-263-6	Active	ROHS3 Compliant
AP1506-50K5G-13	Diodes Incorporated	3A	4.5V	22V	150kHz	-20°C to 85°C	TO-263-6	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (1A Output Current Requirement):

LM2575-5.0WU (Microchip Technology) is the primary recommended substitute. This part maintains identical electrical specifications to the LM2575SX-5.0, including 1A output current, 52kHz switching frequency, and -40°C to 125°C operating temperature range. The device is currently in active production status and is ROHS3 compliant, addressing obsolescence concerns while maintaining full design compatibility.

LM2575D2T-5G and LM2575D2T-5R4G (onsemi) are alternative direct equivalents. Both parts operate at 1A output current with 52kHz switching frequency and -40°C to 125°C temperature range. The minimum input voltage specification is 4.75V compared to 4V for the original part. Both devices are active production items with ROHS3 compliance and MSL-1 moisture sensitivity rating.

For Upgraded Performance (3A Output Current Requirement):

LM2576-5.0WU and LM2576-5.0WU-TR (Microchip Technology) provide 3A output current capability while maintaining all other electrical parameters identical to the LM2575SX-5.0. These parts are suitable for designs requiring increased current margin or future performance upgrades. Both are active production items with ROHS3 compliance.

LM2576D2T-005G and LM2576D2TR4-5G (onsemi) offer 3A output current in D2PAK-5 package configuration. Minimum input voltage is specified at 7V. Both devices are active production items with ROHS3 compliance and MSL-1 moisture sensitivity.

For Alternative Topology (Higher Switching Frequency):

AP1501-50K5G-13 (Diodes Incorporated) provides 3A output current at 150kHz switching frequency, enabling smaller external component sizing. Operating temperature range is -20°C to 85°C. This part is suitable for space-constrained applications where the reduced temperature range is acceptable.

AP1501A-50K5G-13 (Diodes Incorporated) extends output current to 5A at 150kHz switching frequency. Operating temperature range is -20°C to 85°C. This part is recommended for high-current applications where the reduced temperature range is acceptable.

AP1506-50K5G-13 (Diodes Incorporated) is designated as Last Time Buy status. This part provides 3A output current at 150kHz but limits maximum input voltage to 22V. This part is not recommended for new designs due to end-of-life status.

Frequently Asked Questions (FAQ)

Q: Can LM2576-5.0WU directly replace LM2575SX-5.0 in existing designs?

A: LM2576-5.0WU is electrically compatible with LM2575SX-5.0 for all critical parameters including output voltage (5V), input voltage range (4V to 40V), switching frequency (52kHz), and operating temperature (-40°C to 125°C). The increased output current rating (3A versus 1A) does not prevent direct substitution. No circuit modifications are required. The part is pin-compatible in TO-263-6 package configuration.

Q: What is the difference between LM2575D2T-5G and LM2575D2T-5R4G?

A: Both parts are electrically identical LM2575 variants from onsemi with 1A output current, 52kHz switching frequency, and -40°C to 125°C operating temperature. The primary difference is packaging: LM2575D2T-5G is supplied in Tube packaging, while LM2575D2T-5R4G is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on assembly process requirements and quantity needs.

Q: Why do AP1501 series parts operate at 150kHz instead of 52kHz?

A: AP1501 series devices from Diodes Incorporated use a higher switching frequency (150kHz) compared to the LM2575 series (52kHz). Higher switching frequency reduces the size of external filter components (inductors and capacitors) required for circuit operation. This design choice is a fundamental characteristic of the AP1501 topology and cannot be changed through component selection.

Q: Can AP1506-50K5G-13 be used in applications requiring 40V input?

A: No. AP1506-50K5G-13 specifies a maximum input voltage of 22V, which is lower than the LM2575SX-5.0 specification of 40V. This part is not suitable for applications requiring the full 4V to 40V input range. Use LM2576-5.0WU or AP1501-50K5G-13 instead for 40V maximum input voltage support.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: MSL ratings indicate moisture sensitivity during storage and handling. LM2575-5.0WU and LM2576-5.0WU specify MSL-3 (168 Hours), requiring controlled storage conditions. LM2575D2T-5G, LM2575D2T-5R4G, LM2576D2T-005G, and LM2576D2TR4-5G specify MSL-1 (Unlimited), indicating no moisture sensitivity restrictions. MSL-1 rated parts offer greater flexibility in storage and handling procedures.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts are ROHS3 compliant. The original LM2575SX-5.0 is listed as RoHS non-compliant. Substitution with ROHS3 compliant alternatives ensures compliance with current environmental regulations and procurement requirements.

Q: What is the minimum input voltage difference between LM2575-5.0WU and LM2575D2T-5G?

A: LM2575-5.0WU specifies minimum input voltage of 4V, while LM2575D2T-5G specifies 4.75V. For applications operating below 4.75V input, LM2575-5.0WU is required. For applications operating at 4.75V or above, both parts are functionally equivalent.

Q: Can higher current rated parts (3A or 5A) be used in 1A applications?

A: Yes. Higher current rated parts operate identically to lower current rated parts when circuit load current remains below the lower rating. The higher current rating provides design margin and does not affect circuit operation. LM2576-5.0WU (3A) can directly replace LM2575-5.0WU (1A) without circuit modifications.

Q: What packaging options are available for LM2575 equivalent parts?

A: All substitute parts use TO-263-6 (D2PAK) surface mount package with 5 leads plus tab. Packaging format options include Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR). Package format selection depends on assembly process and quantity requirements but does not affect electrical compatibility.

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