AP1506-50T5RL-U Equivalent & Substitute Parts

Part Overview

The AP1506-50T5RL-U is a buck switching regulator IC manufactured by Diodes Incorporated, designed for step-down voltage conversion with a fixed 5V output at 3A capacity. This device operates across an input voltage range of 4.5V to 22V with a switching frequency of 150kHz and is housed in a TO-220-5 package with formed leads. The product is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Fixed 5V
Number of Outputs	1
Voltage - Input (Min)	4.5V
Voltage - Input (Max)	22V
Current - Output	3A
Frequency - Switching	150kHz
Synchronous Rectifier	No
Operating Temperature	-20°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-220-5 Formed Leads
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AP1506-50T5RL-U is determined by the following critical parameters: buck topology with positive fixed 5V output, single output configuration, TO-220-5 package compatibility, through-hole mounting, and ROHS3 compliance. The substitute parts are grouped based on their ability to maintain these core electrical and mechanical specifications.

The LM2596T-5.0/NOPB qualifies as a direct substitute, matching the 3A output current, 150kHz switching frequency, and identical package configuration. The LM2575HVT-5.0/LF03 and LM2591HVT-5.0/NOPB are functional alternatives that maintain the 5V fixed output and TO-220-5 package but operate at reduced output current (1A) and different switching frequencies, suitable for applications with lower current requirements.

Parameter Comparison

Parameter	AP1506-50T5RL-U	LM2596T-5.0/NOPB	LM2575HVT-5.0/LF03	LM2591HVT-5.0/NOPB
Manufacturer	Diodes Incorporated	National Semiconductor	Texas Instruments	Texas Instruments
Product Status	Discontinued	Active	Active	Active
Function	Step-Down	Step-Down	Step-Down	Step-Down
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Fixed 5V	Fixed 5V	Fixed 5V	Fixed 5V
Number of Outputs	1	1	1	1
Voltage - Input (Min)	4.5V	4.5V	4V	4.5V
Voltage - Input (Max)	22V	40V	60V	60V
Current - Output	3A	3A	1A	1A
Frequency - Switching	150kHz	150kHz	52kHz	150kHz
Synchronous Rectifier	No	No	No	No
Operating Temperature	-20°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads	TO-220-5 Formed Leads
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	Not specified	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The LM2596T-5.0/NOPB is the primary substitute for the AP1506-50T5RL-U, offering identical electrical performance with 3A output current and 150kHz switching frequency while maintaining TO-220-5 package compatibility. This part is currently in active production status and provides direct functional replacement without design modification.

The LM2575HVT-5.0/LF03 and LM2591HVT-5.0/NOPB are alternative substitutes suitable for applications where output current requirements do not exceed 1A. Both parts are manufactured by Texas Instruments under the SIMPLE SWITCHER® series, maintain ROHS3 compliance, and offer extended operating temperature ranges (-40°C to 125°C). The LM2591HVT-5.0/NOPB matches the 150kHz switching frequency of the original part, while the LM2575HVT-5.0/LF03 operates at 52kHz with a wider input voltage range (4V to 60V).

All substitute parts are ROHS3 compliant and maintain the same package configuration, ensuring mechanical and electrical compatibility with existing board designs.

Frequently Asked Questions (FAQ)

Q: Can the LM2596T-5.0/NOPB directly replace the AP1506-50T5RL-U without circuit modifications?

A: Yes. The LM2596T-5.0/NOPB provides direct substitution with matching output current (3A), switching frequency (150kHz), fixed 5V output, and TO-220-5 package configuration. No circuit modifications are required.

Q: What are the limitations of using LM2575HVT-5.0/LF03 or LM2591HVT-5.0/NOPB as substitutes?

A: Both parts reduce output current capability to 1A, making them suitable only for applications requiring 1A or less. The LM2575HVT-5.0/LF03 operates at 52kHz instead of 150kHz, which may affect filter component selection and EMI characteristics.

Q: Are all substitute parts ROHS3 compliant?

A: The LM2575HVT-5.0/LF03 and LM2591HVT-5.0/NOPB are ROHS3 compliant. The LM2596T-5.0/NOPB compliance status is not specified in the provided data.

Q: What is the difference in operating temperature ranges?

A: The AP1506-50T5RL-U operates from -20°C to 85°C (TA). All substitute parts operate from -40°C to 125°C (TJ), providing extended temperature performance suitable for wider environmental applications.

Q: Are the package dimensions identical across all parts?

A: All parts use TO-220-5 Formed Leads packaging, ensuring mechanical compatibility. Physical board layout and thermal management considerations remain consistent across substitutions.

Q: What is the moisture sensitivity difference between the original and substitute parts?

A: The AP1506-50T5RL-U has MSL 3 (168 hours). The LM2575HVT-5.0/LF03 and LM2591HVT-5.0/NOPB have MSL 1 (Unlimited), indicating superior moisture resistance and reduced handling restrictions.

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