AP1506-50K5G-13 Equivalent & Substitute Parts

Part Overview

The AP1506-50K5G-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive fixed 5V output at 3A current capacity. This part operates across an input voltage range of 4.5V to 22V with a switching frequency of 150kHz and is housed in a TO-263-6 D2PAK package with 5 leads plus tab. The device is classified as Last Time Buy, indicating discontinued production status. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring 5V buck regulation at 3A output.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Fixed 5V
Number of Outputs	1
Current - Output	3A
Voltage - Input (Min)	4.5V
Voltage - Input (Max)	22V
Frequency - Switching	150kHz
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-20°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the AP1506-50K5G-13 is determined by the following critical parameters:

Primary Compatibility Criteria:

Output voltage: Fixed 5V
Output current capability: Minimum 3A
Package type: TO-263-6 D2PAK (5 Leads + Tab) or equivalent mechanical footprint
Topology: Buck switching regulator
Output configuration: Positive

Secondary Compatibility Criteria:

Input voltage range: Must encompass or exceed 4.5V to 22V
Operating temperature range: Must support -20°C to 85°C minimum
RoHS compliance: ROHS3 Compliant
Synchronous rectifier: Not required

Substitute parts are grouped into two categories based on output current capacity:

Category A - Full Current Equivalents (3A Output): Parts with 3A output current rating provide direct functional replacement without derating considerations.

Category B - Reduced Current Alternatives (1A Output): Parts with 1A output current rating are listed as substitutes but operate at reduced current capacity and require circuit-level evaluation for application suitability.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min)	Input Voltage (Max)	Switching Frequency	Operating Temperature	Package	Product Status
AP1506-50K5G-13	Diodes Incorporated	3A	4.5V	22V	150kHz	-20°C ~ 85°C	TO-263-6 D2PAK	Last Time Buy
LM2576-5.0WU	Microchip Technology	3A	4V	40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active
LM2576-5.0WU-TR	Microchip Technology	3A	4V	40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active
LM2575-5.0WU	Microchip Technology	1A	4V	40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active
LM2575-5.0WU-TR	Microchip Technology	1A	4V	40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active
LM2575D2T-5G	onsemi	1A	4.75V	40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active
LM2575D2T-5R4G	onsemi	1A	4.75V	40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active
LM2575HVS-5.0/NOPB	Texas Instruments	1A	4V	60V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active
LM2575HVSX-5.0/NOPB	Texas Instruments	1A	4V	60V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active
LM2575S-5.0/NOPB	Texas Instruments	1A	4V	40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active
LM2575SX-5.0/NOPB	Texas Instruments	1A	4V	40V	52kHz	-40°C ~ 125°C	TO-263-6 D2PAK	Active

Engineering Selection Recommendations

Direct Replacement (3A Output Current):

LM2576-5.0WU and LM2576-5.0WU-TR from Microchip Technology are the primary equivalents for the AP1506-50K5G-13. Both parts maintain 3A output current capacity, identical 5V fixed output voltage, and compatible TO-263-6 D2PAK packaging. These devices are in Active product status with extended input voltage range (4V to 40V) and wider operating temperature range (-40°C to 125°C), providing enhanced design margin. The difference between LM2576-5.0WU (Tube packaging) and LM2576-5.0WU-TR (Tape & Reel packaging) is packaging format only; electrical specifications are identical. Both are ROHS3 Compliant with MSL 3 rating.

Alternative Substitutes (1A Output Current):

LM2575 series devices from Microchip Technology, onsemi, and Texas Instruments are listed as substitutes but operate at reduced 1A output current. These include LM2575-5.0WU, LM2575-5.0WU-TR, LM2575D2T-5G, LM2575D2T-5R4G, LM2575HVS-5.0/NOPB, LM2575HVSX-5.0/NOPB, LM2575S-5.0/NOPB, and LM2575SX-5.0/NOPB. All maintain identical 5V output voltage and TO-263-6 D2PAK package compatibility. These parts are suitable only for applications where output current requirements do not exceed 1A. All LM2575 variants are in Active product status with ROHS3 compliance.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory requirements. Moisture sensitivity levels are consistent across all alternatives (MSL 3 for Microchip and Texas Instruments; MSL 1 for onsemi variants, indicating superior moisture resistance).

Frequently Asked Questions (FAQ)

Q: Can LM2575 series parts directly replace the AP1506-50K5G-13?

A: LM2575 parts are mechanically and electrically compatible in terms of package and output voltage but are rated for 1A output current versus the AP1506's 3A rating. Direct replacement is possible only if the application's maximum output current requirement does not exceed 1A. For applications requiring 3A output, use LM2576 series parts instead.

Q: What is the difference between LM2576-5.0WU and LM2576-5.0WU-TR?

A: Both parts are electrically identical with 3A output current, 5V fixed output, and TO-263-6 D2PAK packaging. The difference is packaging format: LM2576-5.0WU is supplied in Tube packaging, while LM2576-5.0WU-TR is supplied in Tape & Reel format. Selection depends on assembly process requirements and volume considerations.

Q: Are there input voltage range differences between the AP1506 and LM2576 substitutes?

A: Yes. The AP1506-50K5G-13 operates from 4.5V to 22V input, while LM2576 parts operate from 4V to 40V. The LM2576's wider input range provides additional design flexibility and is fully compatible with the AP1506's specified range.

Q: Which substitute offers the widest input voltage range?

A: Texas Instruments LM2575HVS-5.0/NOPB and LM2575HVSX-5.0/NOPB offer the widest input voltage range at 4V to 60V. However, these are 1A devices and suitable only for reduced-current applications.

Q: Do all substitutes maintain the same operating temperature range as the AP1506?

A: No. The AP1506 operates from -20°C to 85°C (TA), while all substitute parts operate from -40°C to 125°C (TJ). The substitutes provide a wider temperature range, which is advantageous for demanding thermal environments.

Q: Are there switching frequency differences between the AP1506 and substitutes?

A: Yes. The AP1506 operates at 150kHz switching frequency, while all LM2575 and LM2576 substitutes operate at 52kHz. The lower switching frequency in substitutes may affect output ripple characteristics and PCB layout considerations. Circuit-level evaluation is recommended for noise-sensitive applications.

Q: What is the MSL (Moisture Sensitivity Level) difference between onsemi and other manufacturers?

A: onsemi LM2575D2T variants are rated MSL 1 (Unlimited moisture exposure), while Microchip and Texas Instruments parts are rated MSL 3 (168 hours maximum). MSL 1 provides superior moisture resistance for storage and handling in humid environments.

Q: Can I use LM2575 parts in a design originally specified for AP1506?

A: LM2575 parts are pin-compatible and package-compatible but are limited to 1A output current. Use only if your application's maximum output current does not exceed 1A. For full 3A capability, use LM2576 series parts.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 Compliant and REACH Unaffected, matching the AP1506's regulatory compliance status.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message