FT833B12-RT LED Driver IC Equivalent & Substitute Parts

Part Overview

The FT833B12-RT is an AC DC offline switcher LED driver IC manufactured by Fremont Micro Devices Ltd, designed for lighting applications with a 420mA output capability and flyback topology. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device operates across a 9V to 20V supply range in an 8-SOP surface mount package.

Substiute Parts

FT833B12-RT

Fremont Micro Devices LtdIn Stock: 3651FT833B12-RT Datasheet

Current PartRFQ

AL1692-30BS7-13

Diodes IncorporatedIn Stock: 3621AL1692-30BS7-13 Datasheet

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LYT2004K-TL

Power IntegrationsIn Stock: 4456LYT2004K-TL Datasheet

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RT7306GS

Richtek USA Inc.In Stock: 1643RT7306GS 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 FT833B12-RT is determined by the following critical parameters: AC DC offline switcher topology, flyback converter design, single output configuration, surface mount 8-SOP packaging, and lighting application suitability. The supply voltage range (9V to 20V) and output current capability (420mA) establish the baseline performance envelope. Substitute parts must maintain compatibility with these core electrical specifications and physical package constraints.

The identified substitute parts are grouped based on their adherence to these parameters:

Primary substitutes maintain flyback topology with AC DC offline switching capability and comparable supply voltage ranges. Secondary substitutes offer extended functionality through additional topologies (buck/boost) or enhanced dimming capabilities while preserving core flyback operation and package compatibility.

Parameter Comparison

Engineering Selection Recommendations

RT7306GS provides the closest electrical and physical compatibility with the FT833B12-RT. Both devices share identical 8-SOIC packaging, matching supply voltage minimums (11V vs. 9V), and comparable maximum supply voltages (34V vs. 20V). RT7306GS is active in production with ROHS3 compliance and MSL-3 rating matching the original part's moisture sensitivity profile.

AL1692-30BS7-13 offers extended current capability (3A vs. 420mA) with compatible 8-SOIC packaging and lower minimum supply voltage (8.5V). This part is active with superior moisture handling (MSL-1) and ROHS3 compliance, suitable for applications requiring higher output current within the same package footprint.

TPS92310DGS/NOPB operates at higher supply voltage ranges (13V to 36V) in a smaller 10-VSSOP package. This Texas Instruments device is active with ROHS3 compliance and MSL-1 rating, appropriate for designs with elevated input voltage requirements and space constraints, though package migration is required.

LYT2004K-TL from Power Integrations operates at the highest switching frequency (85kHz) and temperature range (-40°C to 150°C) in a larger 12-BESOP package. This device is active with RoHS compliance and MSL-1 rating, suitable for high-temperature applications and designs accommodating larger package dimensions.

All substitute parts maintain AC DC offline switcher topology with flyback operation and single output configuration. Product status transition from obsolete to active ensures long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can RT7306GS directly replace FT833B12-RT without PCB modifications?

A: RT7306GS shares the same 8-SOIC package footprint and pinout compatibility with FT833B12-RT, enabling direct PCB replacement. However, functional differences in dimming capability (analog vs. unspecified) and internal switch configuration require circuit validation.

Q: What is the primary difference between AL1692-30BS7-13 and FT833B12-RT?

A: AL1692-30BS7-13 provides significantly higher output current (3A vs. 420mA) and supports multiple topologies (flyback, buck, boost) compared to FT833B12-RT's single flyback topology. Both use 8-SOIC packaging with compatible supply voltage ranges.

Q: Why does TPS92310DGS/NOPB require a different package than FT833B12-RT?

A: TPS92310DGS/NOPB uses 10-VSSOP packaging versus FT833B12-RT's 8-SOIC. This package change reflects Texas Instruments' design approach for this device family and requires PCB layout modifications. The higher supply voltage range (13V to 36V) also necessitates circuit design review.

Q: Is LYT2004K-TL suitable for space-constrained applications?

A: No. LYT2004K-TL uses 12-BESOP packaging with an exposed pad, significantly larger than FT833B12-RT's 8-SOIC. This device is appropriate for applications prioritizing high-temperature operation and switching frequency performance over compact form factor.

Q: What moisture sensitivity considerations apply to substitute selection?

A: FT833B12-RT and RT7306GS both carry MSL-3 ratings (168-hour floor life), requiring identical handling procedures. AL1692-30BS7-13, TPS92310DGS/NOPB, and LYT2004K-TL all carry MSL-1 ratings (unlimited floor life), offering superior moisture tolerance and reduced storage constraints.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts carry RoHS or ROHS3 compliance certification, ensuring environmental regulatory alignment with FT833B12-RT replacement requirements.