AP1684AMTR-G1 Equivalent & Substitute Parts

Part Overview

The AP1684AMTR-G1 is an LED Driver IC manufactured by Diodes Incorporated, designed for AC DC offline switching applications with step-down (buck) topology. This component operates as a 1-output LED driver with 150mA output current capability and supports input voltage ranges from 7V to 25V. The device is housed in an 8-SOIC surface mount package and is qualified to AEC-Q100 automotive standards.

The AP1684AMTR-G1 has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for LED lighting applications.

Substiute Parts

AP1684AMTR-G1

Diodes IncorporatedIn Stock: 40254AP1684AMTR-G1 Datasheet

Current PartRFQ

LNK415LG

Power IntegrationsIn Stock: 1760LNK415LG Datasheet

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LYT1603D-TL

Power IntegrationsIn Stock: 3462LYT1603D-TL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AP1684AMTR-G1 are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Product Category: Power Management (PMIC) - LED Driver IC
• Application Domain: LED Lighting
• Type: AC DC Offline Switcher
• Number of Outputs: 1 output configuration
• Mounting Type: Surface Mount capability
• Package Compatibility: 8-SOIC form factor preferred

Secondary Compatibility Factors:

• Topology: Step-Down (Buck) topology preferred for direct replacement
• Operating Temperature Range: Minimum -40°C support required
• RoHS Compliance: ROHS3 or equivalent compliance status
• Supply Voltage Handling: Capability to process input voltage ranges suitable for LED driver applications

The substitute parts identified (LYT1603D-TL and LNK415LG) share the core functional classification as AC DC offline switcher LED driver ICs with single output configuration. However, each substitute exhibits distinct topology, voltage rating, and current handling characteristics that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

LYT1603D-TL Selection Criteria:

The LYT1603D-TL represents the closest functional equivalent to the AP1684AMTR-G1. Both devices employ step-down (buck) topology and share identical 8-SOIC package geometry, enabling direct PCB layout compatibility. The LYT1603D-TL is manufactured by Power Integrations under the LYTSwitch™-1 series and maintains active product status, ensuring long-term supply availability and technical support.

Key advantages include RoHS compliance, unlimited moisture sensitivity level (MSL 1), and extended operating temperature range (-40°C to 125°C junction temperature). The device operates at 20kHz switching frequency and accepts AC input voltage from 90VAC to 308VAC, providing broader input voltage flexibility compared to the original part's 7V to 25V DC specification.

LNK415LG Selection Criteria:

The LNK415LG serves as an alternative substitute when higher output current capacity (1.24A) is required. This device employs flyback topology rather than buck topology, necessitating circuit redesign considerations. The LNK415LG is housed in a 7-SSIP through-hole package, requiring PCB layout modifications and different assembly processes compared to the surface-mount AP1684AMTR-G1.

The LNK415LG operates across a significantly wider input voltage range (36V to 725V) and features PWM dimming capability. Product status is active with RoHS compliance and MSL 1 rating. Operating temperature extends to 150°C junction temperature, supporting demanding thermal environments.

Compliance and Qualification:

The AP1684AMTR-G1 carries AEC-Q100 automotive qualification. Both substitute parts maintain RoHS compliance but do not explicitly reference AEC-Q100 qualification in the provided specifications. Applications requiring automotive-grade components must verify qualification status with manufacturers before implementation.

Frequently Asked Questions (FAQ)

Q: Can the LYT1603D-TL directly replace the AP1684AMTR-G1 without circuit modifications?

A: The LYT1603D-TL shares identical package geometry (8-SOIC) and topology (step-down buck), supporting direct PCB footprint compatibility. However, input voltage specifications differ significantly (90VAC to 308VAC versus 7V to 25V DC). Circuit redesign is required to accommodate the LYT1603D-TL's AC input voltage requirements and internal switching characteristics.

Q: What are the key differences between the LYT1603D-TL and LNK415LG substitutes?

A: The LYT1603D-TL employs step-down (buck) topology with 8-SOIC surface-mount packaging, matching the original part's topology and package form factor. The LNK415LG uses flyback topology with 7-SSIP through-hole packaging, requiring significant circuit and assembly modifications. The LNK415LG provides higher output current (1.24A) and wider input voltage range (36V to 725V) compared to the LYT1603D-TL's unspecified output current and 90VAC to 308VAC input range.

Q: Are the substitute parts suitable for automotive applications?

A: The AP1684AMTR-G1 carries AEC-Q100 automotive qualification. The provided specifications for LYT1603D-TL and LNK415LG do not explicitly reference AEC-Q100 qualification. Automotive applications must confirm qualification status directly with Power Integrations before component selection.

Q: What packaging considerations apply when selecting between these substitutes?

A: The AP1684AMTR-G1 and LYT1603D-TL both use 8-SOIC surface-mount packages with identical 0.154" (3.90mm) width, enabling direct PCB footprint reuse. The LNK415LG uses 7-SSIP through-hole packaging with formed leads, requiring new PCB layout design, different assembly processes, and modified board space allocation.

Q: How do the operating temperature ranges compare?

A: The AP1684AMTR-G1 operates from -40°C to 105°C (ambient temperature). The LYT1603D-TL extends to -40°C to 125°C (junction temperature), and the LNK415LG reaches -40°C to 150°C (junction temperature). Both substitutes support the original part's minimum temperature requirement and provide extended upper temperature capability.

Q: What is the significance of the topology differences between buck and flyback configurations?

A: Buck topology (AP1684AMTR-G1 and LYT1603D-TL) steps down voltage with a single switching element and inductor, suitable for lower voltage applications. Flyback topology (LNK415LG) provides galvanic isolation and operates across wider voltage ranges through transformer-based energy transfer. Topology selection determines circuit architecture, component requirements, and electromagnetic interference characteristics.

Q: Are all substitute parts RoHS compliant?

A: Yes. The AP1684AMTR-G1 is ROHS3 compliant. Both LYT1603D-TL and LNK415LG are RoHS compliant. All three parts meet current environmental and hazardous substance restrictions.