AP1506-33K5G-13 Equivalent & Substitute Parts

Part Overview

The AP1506-33K5G-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 3.3V output at 3A from input voltages ranging from 4.5V to 22V. This component operates at a switching frequency of 150kHz and is housed in a TO-263-6 (D2PAK) surface mount package.

The AP1506-33K5G-13 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

AP1506-33K5G-13

Diodes IncorporatedIn Stock: 4474AP1506-33K5G-13 Datasheet

Current PartRFQ

LM2596SX-3.3/NOPB

Texas InstrumentsIn Stock: 25443LM2596SX-3.3/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP1506-33K5G-13 are identified based on the following critical parameters that determine functional and physical compatibility:

Electrical Compatibility Criteria:

• Fixed output voltage of 3.3V
• Output current rating of 3A or greater
• Input voltage range minimum of 4.5V (substitute must accommodate the full 4.5V to 22V range or exceed it)
• Switching frequency of 150kHz
• Buck topology with positive output configuration
• Single output configuration

Physical Compatibility Criteria:

• Package type: TO-263-6 (D2PAK, 5 Leads + Tab)
• Surface mount mounting type
• Pin-compatible footprint

Compliance Criteria:

• RoHS3 compliance
• Moisture Sensitivity Level (MSL) 3 or better

The LM2596SX-3.3/NOPB meets all electrical and physical compatibility requirements and is designated as the manufacturer-recommended substitute.

Parameter Comparison

Engineering Selection Recommendations

The LM2596SX-3.3/NOPB is the appropriate substitute for the obsolete AP1506-33K5G-13 based on the following engineering factors:

Functional Equivalence: Both devices deliver identical electrical performance for the specified application: 3.3V fixed output at 3A with 150kHz switching frequency and buck topology.

Package Compatibility: Both components use the TO-263-6 (D2PAK) package with identical pinout and footprint, enabling direct PCB-level substitution without layout modifications.

Compliance Alignment: Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring compatibility with manufacturing and storage requirements.

Enhanced Specifications: The LM2596SX-3.3/NOPB provides extended maximum input voltage (40V versus 22V) and wider operating temperature range (-40°C to 125°C versus -20°C to 85°C), offering improved performance margins in demanding applications.

Supply Availability: The LM2596SX-3.3/NOPB is actively manufactured by Texas Instruments with substantial inventory availability, ensuring reliable long-term supply compared to the obsolete AP1506-33K5G-13.

Frequently Asked Questions (FAQ)

Q: Can the LM2596SX-3.3/NOPB be used as a direct replacement for the AP1506-33K5G-13 without PCB modifications?

A: Yes. Both devices share identical TO-263-6 (D2PAK) packaging with matching pinout and footprint. No PCB layout changes are required for substitution.

Q: What are the key electrical differences between these two regulators?

A: The core electrical specifications are identical: 3.3V output, 3A current rating, 150kHz switching frequency, and 4.5V minimum input voltage. The LM2596SX-3.3/NOPB extends the maximum input voltage to 40V (versus 22V) and operating temperature range to -40°C to 125°C (versus -20°C to 85°C).

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant with identical MSL ratings of 3 (168 Hours). Compliance requirements are fully met by the substitute.

Q: Why is the AP1506-33K5G-13 listed as obsolete?

A: The AP1506-33K5G-13 has been discontinued by Diodes Incorporated. The LM2596SX-3.3/NOPB remains in active production and is the recommended alternative for new designs and ongoing supply requirements.

Q: Will the extended input voltage range of the LM2596SX-3.3/NOPB affect circuit operation?

A: No. The extended 40V maximum input rating does not affect operation within the original 4.5V to 22V range. The substitute operates identically to the original part across the specified input voltage window.

Q: Are there any thermal or performance considerations when substituting these parts?

A: The LM2596SX-3.3/NOPB supports a wider operating temperature range (-40°C to 125°C), which may provide improved performance margins in temperature-sensitive applications. Both devices maintain identical thermal characteristics within their respective operating ranges.