AP1506-33K5L-13 Equivalent & Substitute Parts

Part Overview

The AP1506-33K5L-13 is a buck switching regulator IC manufactured by Diodes Incorporated, rated for 3.3V fixed output at 3A maximum current. 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 obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

AP1506-33K5L-13

Diodes IncorporatedIn Stock: 17875AP1506-33K5L-13 Datasheet

Current PartRFQ

LM2575D2T-3.3R4G

onsemiIn Stock: 4705LM2575D2T-3.3R4G Datasheet

MFR RecommendedRFQ

LM2575HVS-3.3/NOPB

Texas InstrumentsIn Stock: 2169LM2575HVS-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2576-3.3WU

Microchip TechnologyIn Stock: 1261LM2576-3.3WU Datasheet

MFR RecommendedRFQ

LM2576-3.3WU-TR

Microchip TechnologyIn Stock: 3580LM2576-3.3WU-TR Datasheet

MFR RecommendedRFQ

LM2576D2TR4-3.3G

onsemiIn Stock: 2742LM2576D2TR4-3.3G Datasheet

MFR RecommendedRFQ

LM2591HVS-3.3/NOPB

Texas InstrumentsIn Stock: 1121LM2591HVS-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2591HVSX-3.3/NOPB

Texas InstrumentsIn Stock: 2369LM2591HVSX-3.3/NOPB Datasheet

MFR RecommendedRFQ

MIC4575-3.3WU

Microchip TechnologyIn Stock: 4000MIC4575-3.3WU Datasheet

MFR RecommendedRFQ

MIC4575-3.3WU-TR

Microchip TechnologyIn Stock: 707MIC4575-3.3WU-TR Datasheet

MFR RecommendedRFQ

MIC4576-3.3WU

Microchip TechnologyIn Stock: 4001MIC4576-3.3WU Datasheet

MFR RecommendedRFQ

MIC4576-3.3WU-TR

Microchip TechnologyIn Stock: 3498MIC4576-3.3WU-TR Datasheet

MFR RecommendedRFQ

TL2575-33IKTTR

Texas InstrumentsIn Stock: 3717TL2575-33IKTTR Datasheet

MFR RecommendedRFQ

TL2575HV-33IKTTR

Texas InstrumentsIn Stock: 1809TL2575HV-33IKTTR Datasheet

MFR RecommendedRFQ

TL2575HV-33QKTTRQ1

Texas InstrumentsIn Stock: 4498TL2575HV-33QKTTRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AP1506-33K5L-13 is determined by the following critical parameters:

• Output Voltage: 3.3V fixed output (all substitutes maintain this specification)
• Output Current Capability: Minimum 3A required to match original performance
• Package Type: TO-263-6 D2PAK (5 Leads + Tab) for mechanical and electrical compatibility
• Input Voltage Range: Minimum 4.5V input support required
• Topology: Buck switching regulator topology
• Output Configuration: Positive fixed output

Substitute parts are grouped into two categories:

Category A - Direct Current Rating Match (3A Output) Parts with 3A output current rating provide equivalent performance without derating: LM2576-3.3WU, LM2576-3.3WU-TR, LM2576D2TR4-3.3G, MIC4576-3.3WU

Category B - Reduced Current Rating (1A to 1.7A Output) Parts with lower output current ratings (1A or 1.7A) function as substitutes only in applications where the full 3A capability is not required: LM2575D2T-3.3R4G, LM2575HVS-3.3/NOPB, LM2591HVS-3.3/NOPB, LM2591HVSX-3.3/NOPB, MIC4575-3.3WU, MIC4575-3.3WU-TR

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (3A Output Current Required)

LM2576-3.3WU-TR and LM2576D2TR4-3.3G are the primary recommendations. Both are active products with extended operating temperature ranges (-40°C to 125°C) and ROHS3 compliance. LM2576-3.3WU-TR is available in Tape & Reel packaging, matching the original part's packaging format. LM2576D2TR4-3.3G is manufactured by onsemi with MSL rating of 1 (Unlimited), providing superior moisture handling compared to the original part's MSL 3 rating.

MIC4576-3.3WU provides 3A output capability with active product status and ROHS3 compliance. This part operates at 200kHz switching frequency, higher than the original 150kHz, which may reduce output filter component sizes in new designs.

For Current-Limited Applications (1A to 1.7A Output Current)

LM2591HVSX-3.3/NOPB matches the original part's 150kHz switching frequency and maintains the 4.5V minimum input voltage specification. This part is available in Tape & Reel packaging and is active with ROHS3 compliance.

LM2575HVS-3.3/NOPB offers the widest input voltage range (4V to 60V) among 1A alternatives and is active with ROHS3 compliance. Texas Instruments SIMPLE SWITCHER series designation indicates mature design maturity.

MIC4575-3.3WU and MIC4575-3.3WU-TR provide 1.7A output capability with buck-boost topology option, though buck mode operation is compatible with the original application. These parts operate at 200kHz and are available in both Tube and Tape & Reel packaging.

Compliance Considerations

All substitute parts maintain ROHS3 compliance. LM2591HVS-3.3/NOPB carries REACH Affected status, while all other substitutes are REACH Unaffected. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001 (with LM2591HVSX-3.3/NOPB under 8542.39.0060).

Frequently Asked Questions (FAQ)

Q: Can I use a 1A-rated part as a direct replacement for the 3A AP1506-33K5L-13?

A: No. The AP1506-33K5L-13 is rated for 3A output current. Using a 1A-rated substitute (such as LM2575D2T-3.3R4G or LM2591HVS-3.3/NOPB) will limit maximum output current to 1A. This is acceptable only if your application requires less than 1A. Exceeding the rated current will cause thermal shutdown and circuit malfunction.

Q: What is the difference between LM2576-3.3WU and LM2576-3.3WU-TR?

A: Both parts are electrically identical with 3A output rating and identical electrical specifications. The difference is packaging format: LM2576-3.3WU is supplied in Tube packaging, while LM2576-3.3WU-TR is supplied in Tape & Reel (TR) format. Choose based on your assembly process requirements. Tape & Reel is standard for automated pick-and-place assembly.

Q: Why does the LM2576D2TR4-3.3G have a 7V minimum input voltage while the original part specifies 4.5V?

A: The LM2576D2TR4-3.3G has a higher minimum input voltage specification (7V vs. 4.5V). This part is not suitable for applications requiring operation below 7V input. Verify your minimum input voltage requirement before selecting this substitute.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original AP1506-33K5L-13 compliance status.

Q: What does MSL (Moisture Sensitivity Level) mean for component selection?

A: MSL indicates moisture sensitivity during storage and handling. The original AP1506-33K5L-13 has MSL 3 (168 hours). Lower MSL ratings (such as MSL 1 on LM2576D2TR4-3.3G) indicate less moisture sensitivity and longer shelf life without baking. Higher MSL ratings require more careful storage and may require baking before reflow soldering.

Q: Can I use MIC4575-3.3WU in place of the AP1506-33K5L-13?

A: MIC4575-3.3WU has only 1.7A output current rating versus the required 3A. Additionally, its maximum input voltage is limited to 24V compared to the original 22V specification. This part is suitable only for applications requiring less than 1.7A output current and input voltages below 24V.

Q: What is the switching frequency difference and does it matter?

A: The original AP1506-33K5L-13 operates at 150kHz. Most substitutes (LM2576 series, MIC4575/4576 series) operate at 52kHz or 200kHz. Lower switching frequency (52kHz) requires larger output filter inductors and capacitors. Higher switching frequency (200kHz) allows smaller filter components. Verify your PCB layout and component availability before selecting based on switching frequency.

Q: Is LM2591HVSX-3.3/NOPB a better choice than LM2591HVS-3.3/NOPB?

A: Both parts are electrically identical with 1A output rating and 150kHz switching frequency. The difference is packaging: LM2591HVSX-3.3/NOPB is supplied in Tape & Reel format, while LM2591HVS-3.3/NOPB is supplied in Tube format. LM2591HVSX-3.3/NOPB also carries a different HTSUS code (8542.39.0060 vs. 8542.39.0001). Choose based on your assembly process and tariff classification requirements.