AP1512-K5L-U Buck Switching Regulator Equivalent & Substitute Parts

Part Overview

The AP1512-K5L-U is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable output applications with 2A output current capability. This part operates across a wide input voltage range of 4.5V to 60V and delivers adjustable output from 1.23V to 37V. The device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across input/output voltage ranges, output current capacity, and package specifications while meeting current product availability and compliance standards.

Key Parameters

Parameter	AP1512-K5L-U
Manufacturer	Diodes Incorporated
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Adjustable
Number of Outputs	1
Voltage - Input (Min)	4.5V
Voltage - Input (Max)	60V
Voltage - Output (Min/Fixed)	1.23V
Voltage - Output (Max)	37V
Current - Output	2A
Frequency - Switching	50kHz
Operating Temperature	-20°C ~ 85°C (TA)
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP1512-K5L-U are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Function: Step-Down (Buck) topology
Output Configuration: Positive adjustable output
Output Voltage Range: Minimum 1.23V to maximum 37V or higher
Package: TO-263-6, D2PAK (5 Leads + Tab) form factor
Input Voltage Range: Minimum 4.5V to maximum 40V or higher
Output Current: Equal to or greater than 2A

Substitution Groups:

Group 1 - Direct Current Upgrade (3A Output): LM2576WU, LM2576WU-TR, LM2596DSADJG, LM2596DSADJR4G. These parts provide higher output current (3A) while maintaining identical voltage ranges and package specifications. Suitable for designs requiring increased current capacity without circuit modification.

Group 2 - Enhanced Performance (2A Output, Higher Frequency): LM2592HVS-ADJ/NOPB. Maintains 2A output current with higher switching frequency (150kHz) and extended input voltage range to 60V, matching the original part's maximum input specification.

Group 3 - Lower Current Alternative (1A Output): TL2575-ADJIKTTR, TL2575-ADJIKTTRG3, TL2575HV-ADJIKTTR. These parts provide reduced output current (1A) and are suitable only for applications with lower current requirements. TL2575HV-ADJIKTTR extends input voltage range to 60V.

All substitute parts maintain ROHS3 compliance and identical package specifications. Substitution within groups preserves circuit functionality; cross-group substitution requires design verification based on application current requirements.

Parameter Comparison

Parameter	AP1512-K5L-U	LM2576WU	LM2576WU-TR	LM2592HVS-ADJ/NOPB	LM2596DSADJG	LM2596DSADJR4G	TL2575-ADJIKTTR	TL2575-ADJIKTTRG3	TL2575HV-ADJIKTTR
Manufacturer	Diodes Inc.	Microchip	Microchip	Texas Instruments	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Function	Step-Down	Step-Down	Step-Down	Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Down	Step-Down	Step-Down
Output Configuration	Positive	Positive	Positive	Positive	Positive or Negative	Positive or Negative	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Min)	4.5V	4V	4V	4.5V	4.5V	4.5V	4.75V	4.75V	4.75V
Voltage - Input (Max)	60V	40V	40V	60V	40V	40V	40V	40V	60V
Voltage - Output (Min/Fixed)	1.23V	1.23V	1.23V	1.2V	1.23V	1.23V	1.23V	1.23V	1.23V
Voltage - Output (Max)	37V	37V	37V	57V	37V	37V	37V	37V	57V
Current - Output	2A	3A	3A	2A	3A	3A	1A	1A	1A
Frequency - Switching	50kHz	52kHz	52kHz	150kHz	150kHz	150kHz	52kHz	52kHz	52kHz
Operating Temperature	-20°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Preferred): LM2592HVS-ADJ/NOPB is the optimal substitute when the original 2A output current specification must be maintained. This part matches the input voltage range (4.5V to 60V) and output voltage range (1.2V to 57V) of the AP1512-K5L-U while offering active product status and extended operating temperature range (-40°C to 125°C). All parts are ROHS3 compliant and use identical TO-263-6 D2PAK packaging.

For Increased Current Capacity: LM2576WU, LM2576WU-TR, LM2596DSADJG, and LM2596DSADJR4G provide 3A output current, suitable for applications requiring higher current delivery. LM2596 variants offer additional flexibility with multi-topology support (buck, boost, buck-boost). These parts are active products with established supply chains.

For Lower Current Applications: TL2575-ADJIKTTR, TL2575-ADJIKTTRG3, and TL2575HV-ADJIKTTR are suitable only when application current requirements do not exceed 1A. TL2575HV-ADJIKTTR extends input voltage range to 60V, matching the original part's maximum specification.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and EAR99 export classification. Moisture sensitivity levels vary (MSL 1 to MSL 3); verify packaging and storage requirements for your supply chain. All parts are REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can I use LM2596DSADJG as a direct replacement for AP1512-K5L-U? A: LM2596DSADJG is functionally compatible with identical voltage ranges and higher output current (3A vs 2A). The package is identical TO-263-6 D2PAK. However, LM2596 supports multiple topologies (buck, boost, buck-boost) and positive or negative output configurations, which may introduce unused functionality. For buck-only positive output applications, this substitution is valid.

Q: What is the difference between LM2576WU and LM2576WU-TR? A: Both parts are identical in electrical specifications and package. The difference is packaging format: LM2576WU is supplied in Tube packaging, while LM2576WU-TR is supplied in Tape & Reel (TR) format. Select based on your assembly process requirements and volume.

Q: Why does LM2592HVS-ADJ/NOPB have a higher switching frequency (150kHz) than the original part (50kHz)? A: Higher switching frequency reduces output filter component size and improves transient response. This is a performance enhancement that does not affect functional compatibility. The higher frequency may reduce EMI in some applications but requires verification of filter component values in your specific circuit design.

Q: Can I substitute a 1A part (TL2575 series) for the 2A AP1512-K5L-U? A: Only if your application current requirement does not exceed 1A. The 1A output current limit is a hard specification; exceeding it will cause thermal shutdown or device damage. Verify your actual circuit current draw before selecting a lower-current substitute.

Q: Are all substitute parts available in the same packaging options? A: All substitute parts use TO-263-6 D2PAK (5 Leads + Tab) package. However, packaging formats (Tube, Tape & Reel, Cut Tape) vary by part number. Verify packaging availability with your supplier based on your assembly requirements.

Q: What is the impact of different input voltage maximum ratings? A: AP1512-K5L-U supports 60V maximum input; LM2576WU and LM2596 series support 40V maximum. If your application uses input voltages between 40V and 60V, you must select LM2592HVS-ADJ/NOPB or TL2575HV-ADJIKTTR to maintain full voltage range compatibility.

Q: Do I need to change external components when substituting parts? A: All substitute parts maintain identical adjustable output voltage range (1.23V minimum) and similar switching frequencies (50-150kHz). External resistor dividers for output voltage setting and filter components may require recalculation based on the specific part's switching frequency and current rating. Consult the datasheet for each substitute part.

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