LM2576T-012G Buck Switching Regulator Equivalent & Substitute Parts

Part Overview

The LM2576T-012G is a buck switching regulator IC manufactured by onsemi, designed for step-down voltage conversion with a fixed 12V output at 3A capacity. The device operates across a 7V to 40V input range and is housed in a TO-220-5 through-hole package. This part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2576T-012G
Manufacturer	onsemi
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Voltage	12V Fixed
Output Current	3A
Input Voltage Range	7V to 40V
Switching Frequency	52kHz
Package Type	TO-220-5
Operating Temperature	-40°C to 125°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LM2576T-012G is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage: 12V fixed
Output current capacity: 3A minimum
Package type: TO-220-5 through-hole
Input voltage range: Minimum 7V, maximum 40V
Operating temperature range: -40°C to 125°C
Topology: Buck switching regulator

Manufacturer Recommended Equivalent: The LM2576T-ADJG from onsemi shares the same base product number (LM2576), identical package, current rating, input voltage range, and switching frequency. Although this part features adjustable output voltage rather than fixed 12V, it can be configured to 12V output through external resistor networks, making it a direct functional equivalent.

Similar Substitutes: Parts meeting the fixed 12V output, 3A current, and TO-220-5 package requirements are classified as direct substitutes. The LM2576-12WT (Microchip Technology) and LM2596T-12/NOPB (Texas Instruments) both satisfy these core parameters. Parts with reduced current capacity (1A) such as LM2575-12WT and LM2595T-12/NOPB are suitable only for applications requiring lower output current.

Parameter Comparison

Parameter	LM2576T-012G (Main)	LM2576T-ADJG	LM2576-12WT	LM2596T-12/NOPB	LM2575-12WT	LM2595T-12/NOPB
Manufacturer	onsemi	onsemi	Microchip Technology	Texas Instruments	Microchip Technology	Texas Instruments
Output Voltage	12V Fixed	1.23V to 37V Adjustable	12V Fixed	12V Fixed	12V Fixed	12V Fixed
Output Current	3A	3A	3A	3A	1A	1A
Input Voltage Range	7V to 40V	7V to 40V	4V to 40V	4.5V to 40V	4V to 40V	4.5V to 40V
Switching Frequency	52kHz	52kHz	52kHz	150kHz	52kHz	150kHz
Package Type	TO-220-5	TO-220-5	TO-220-5	TO-220-5	TO-220-5	TO-220-5
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct 3A Output Current Replacement: The LM2576-12WT (Microchip Technology) and LM2596T-12/NOPB (Texas Instruments) are the primary substitutes. Both maintain the 12V fixed output, 3A current capacity, and TO-220-5 package. The LM2596T-12/NOPB operates at 150kHz switching frequency compared to the original 52kHz, which may affect filter component selection and EMI characteristics. Both parts are active products with ROHS3 compliance.

For Adjustable Output Configuration: The LM2576T-ADJG from onsemi provides the same manufacturer lineage and electrical specifications as the original part. External resistor dividers can configure this device to 12V output, offering design flexibility for future modifications. This part maintains the 52kHz switching frequency and is currently in active production status.

For Current-Limited Applications: The LM2575-12WT and LM2595T-12/NOPB are suitable only for applications requiring 1A or less output current. These parts share the same 12V fixed output and TO-220-5 package but cannot support the full 3A specification of the original device.

Compliance Considerations: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original LM2576T-012G.

Frequently Asked Questions (FAQ)

Q: Can the LM2576T-ADJG replace the LM2576T-012G directly without circuit modifications? A: The LM2576T-ADJG requires external resistor networks to set the output voltage to 12V. Direct pin-for-pin replacement is not possible without adding these components. However, the same PCB footprint and package accommodate this configuration.

Q: What is the impact of the higher switching frequency in the LM2596T-12/NOPB? A: The LM2596T-12/NOPB operates at 150kHz versus the original 52kHz. This affects the size and selection of input and output filter inductors and capacitors. Higher frequency allows smaller passive components but may require re-evaluation of the power supply filter design.

Q: Are the Microchip Technology and Texas Instruments substitutes pin-compatible? A: All listed substitutes use the TO-220-5 package with identical pinout. Pin compatibility is maintained across all alternatives.

Q: Can I use the 1A-rated parts (LM2575-12WT or LM2595T-12/NOPB) in place of the 3A original? A: These parts are suitable only for applications requiring 1A maximum output current. Using them in 3A applications will cause thermal stress and potential device failure.

Q: What is the minimum input voltage difference between substitutes? A: The original LM2576T-012G operates from 7V minimum input. The Microchip and Texas Instruments alternatives operate from 4V or 4.5V minimum, providing greater flexibility for lower input voltage sources.

Q: Are all substitutes currently available for procurement? A: The LM2576T-ADJG, LM2576-12WT, LM2596T-12/NOPB, LM2575-12WT, and LM2595T-12/NOPB are all listed as active products with current inventory availability.

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