AP1685MTR-G1 Equivalent & Substitute Parts

Part Overview

The AP1685MTR-G1 is an LED driver IC manufactured by Diodes Incorporated, designed for AC/DC offline switching applications. This single-output, step-down (buck) topology device delivers 2.5A output current and operates across an 8V to 25V supply range. The part is currently in active production status with substantial inventory availability (40,300 pcs).

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within alternative electrical specifications. The parts listed below maintain functional equivalence within the AC/DC offline switcher LED driver category while accommodating variations in supply voltage ranges, frequency characteristics, and dimming methodologies.

Substiute Parts

AP1685MTR-G1

Diodes IncorporatedIn Stock: 40399AP1685MTR-G1 Datasheet

Current PartRFQ

AP1685MTR-G1

Diodes IncorporatedIn Stock: 40399AP1685MTR-G1 Datasheet

Parametric EquivalentRFQ

MP4050AGS-Z

Monolithic Power Systems Inc.In Stock: 3895MP4050AGS-Z Datasheet

MFR RecommendedRFQ

TPS92001DR

Texas InstrumentsIn Stock: 878TPS92001DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AP1685MTR-G1 is determined by the following critical parameters:

• Product Category: Power Management (PMIC) - LED Driver IC
• Converter Type: AC/DC Offline Switcher
• Topology: Step-Down (Buck) or compatible multi-topology designs
• Output Configuration: Single output
• Package Compatibility: 8-SOIC form factor (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Supply Voltage Range: Minimum 8V to 25V maximum (or overlapping range)
• Output Current Capability: 2.5A or greater
• Operating Temperature: -40°C to 105°C or wider range
• Compliance: ROHS3 Compliant, REACH Unaffected

The substitute parts listed below satisfy these core criteria while maintaining functional equivalence in LED driver applications. Variations in frequency, dimming methodology, and internal switch configuration are permitted where the fundamental electrical performance envelope is preserved.

Parameter Comparison

Engineering Selection Recommendations

AP1685MTR-G1 (Primary Part - Diodes Incorporated)

Active production status with high inventory availability (40,300 pcs). Recommended as the first-choice component for new designs and ongoing production. ROHS3 compliant with MSL 3 rating suitable for standard manufacturing environments.

MP4050AGS-Z (Monolithic Power Systems Inc.)

Active production status with 3,800 pcs in stock. Supports automotive-grade applications with extended operating temperature range (-40°C to 125°C). Supply voltage range (4.1V to 5V) is narrower than the primary part; use only when design specifications permit operation within this reduced range. ROHS3 compliant with improved MSL 2 rating.

TPS92001DR (Texas Instruments)

Last Time Buy status indicates this part is approaching end-of-life. Existing inventory of 855 pcs remains available. This part should be considered only for legacy design support or when existing supply agreements are in place. ROHS3 compliant with MSL 1 (unlimited shelf life). The Triac dimming capability and Flyback topology option provide functional flexibility not present in the primary part, but the Last Time Buy status limits its suitability for new designs.

Frequently Asked Questions (FAQ)

Q: Can MP4050AGS-Z replace AP1685MTR-G1 in all applications?

A: No. The MP4050AGS-Z operates within a 4.1V to 5V supply range, whereas the AP1685MTR-G1 requires 8V to 25V. Substitution is valid only when your design operates within the narrower 4.1V to 5V window. Verify your power supply specifications before selecting this substitute.

Q: Why is TPS92001DR marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued this part and existing inventory represents the final available stock. This part should not be selected for new product designs. It remains available only for legacy system support or maintenance applications.

Q: Are all three parts pin-compatible?

A: All three parts use the 8-SOIC (0.154", 3.90mm Width) package. However, pin-level compatibility must be verified against the specific datasheet for each manufacturer, as internal switch configuration and functional pinout may differ. Consult the device datasheets before PCB layout finalization.

Q: What is the significance of the MSL (Moisture Sensitivity Level) difference?

A: AP1685MTR-G1 carries MSL 3 (168 hours), while MP4050AGS-Z carries MSL 2 (1 year). Lower MSL numbers indicate greater tolerance to moisture exposure during storage and handling. MP4050AGS-Z requires less stringent moisture control during manufacturing, which may reduce production costs in high-volume environments.

Q: Can I use TPS92001DR for new designs despite Last Time Buy status?

A: Not recommended. Last Time Buy status means no future production is planned. Using this part in new designs creates supply chain risk and potential obsolescence issues within the product lifecycle. Select AP1685MTR-G1 or MP4050AGS-Z for new designs.

Q: What is the difference between Step-Down (Buck) and Flyback topologies in these parts?

A: Step-Down (Buck) topology is a direct voltage conversion method used in AP1685MTR-G1 and MP4050AGS-Z. TPS92001DR supports both Flyback and Step-Down topologies, providing design flexibility. Topology selection depends on isolation requirements and application-specific power distribution architecture. Consult application notes for topology-specific design guidance.