RT7311BGS LED Driver IC - Equivalent & Substitute Parts

Part Overview

The RT7311BGS is an LED Driver IC manufactured by Richtek USA Inc., designed for AC DC offline switching applications with Triac dimming capability. This 8-SOP surface mount device operates across a 12V to 25V supply range and supports Flyback, Step-Down (Buck), and Step-Up (Boost) topologies. The product is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

RT7311BGS

Richtek USA Inc.In Stock: 1014RT7311BGS Datasheet

Current PartRFQ

MP4060GK

Monolithic Power Systems Inc.In Stock: 1186MP4060GK Datasheet

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TPS92310DGS/NOPB

Texas InstrumentsIn Stock: 1277TPS92310DGS/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the RT7311BGS is determined by the following critical parameters:

• Device Type: AC DC Offline Switcher with LED driver functionality
• Topology Compatibility: Flyback, Buck, or Boost configurations
• Number of Outputs: Single output requirement
• Dimming Capability: Triac dimming support
• Operating Temperature Range: -40°C to 125°C (TJ)
• Surface Mount Packaging: Compatible with PCB assembly processes
• Compliance: ROHS3 compliance and EAR99 classification

Two substitute parts meet these criteria with varying topology and supply voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

MP4060GK is suitable for applications requiring direct AC mains input (200VAC to 265VAC) with Buck and Boost topologies and Triac dimming support. This part maintains active product status and offers improved moisture sensitivity (MSL 1). Package transition from 8-SOIC to 10-MSOP requires PCB layout modification.

TPS92310DGS/NOPB is suitable for applications with DC supply inputs (13V to 36V) using Flyback topology. This Texas Instruments device provides active product status and superior moisture handling (MSL 1). The 10-VSSOP package differs from the original 8-SOIC, requiring PCB redesign. Note that Triac dimming is not specified for this part.

Both substitutes maintain ROHS3 compliance, EAR99 classification, and the required -40°C to 125°C operating temperature range. Selection depends on specific supply voltage requirements, topology needs, and dimming functionality.

Frequently Asked Questions (FAQ)

Q: Can MP4060GK directly replace RT7311BGS without PCB modifications?

A: No. MP4060GK uses a 10-MSOP package versus the original 8-SOIC, requiring PCB layout changes. Additionally, MP4060GK operates on 200VAC to 265VAC input, whereas RT7311BGS operates on 12V to 25V DC supply.

Q: Does TPS92310DGS/NOPB support Triac dimming like the original RT7311BGS?

A: No. TPS92310DGS/NOPB does not specify Triac dimming capability. If Triac dimming is required, MP4060GK is the appropriate substitute.

Q: What are the key differences in topology between the substitute parts?

A: RT7311BGS supports Flyback, Buck, and Boost topologies. MP4060GK supports Buck and Boost only. TPS92310DGS/NOPB supports Flyback only. Design topology requirements determine which substitute is compatible.

Q: Are both substitute parts currently in production?

A: Yes. Both MP4060GK and TPS92310DGS/NOPB have Active product status, ensuring long-term availability and supply chain stability compared to the Obsolete RT7311BGS.

Q: What is the impact of MSL rating differences?

A: RT7311BGS has MSL 3 (168 hours), while both substitutes have MSL 1 (Unlimited). Lower MSL ratings indicate better moisture resistance and reduced risk during storage and assembly processes.