AT9933LG-G LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The AT9933LG-G is an active LED driver controller IC manufactured by Microchip Technology, designed for DC-DC conversion applications requiring step-down (buck) and step-up (boost) topologies with PWM dimming capability. This 8-SOIC surface mount device operates across a supply voltage range up to 75V and is qualified to AEC-Q100 automotive standards with ROHS3 compliance. The part is currently in active production status with 3,310 units in stock. Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters while maintaining automotive-grade reliability and compliance requirements.

Substiute Parts

AT9933LG-G

Microchip TechnologyIn Stock: 3335AT9933LG-G Datasheet

Current PartRFQ

HV9930LG-G

Microchip TechnologyIn Stock: 7089HV9930LG-G Datasheet

Parametric EquivalentRFQ

LT3791MPFE#PBF

Analog Devices Inc.In Stock: 883LT3791MPFE#PBF Datasheet

MFR RecommendedRFQ

LT8391IUFD#PBF

Analog Devices Inc.In Stock: 2085LT8391IUFD#PBF Datasheet

MFR RecommendedRFQ

STCS05ADR

STMicroelectronicsIn Stock: 9724STCS05ADR Datasheet

MFR RecommendedRFQ

TLD5190QVXUMA1

Infineon TechnologiesIn Stock: 2643TLD5190QVXUMA1 Datasheet

MFR RecommendedRFQ

TPS92692QPWPRQ1

Texas InstrumentsIn Stock: 10490TPS92692QPWPRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT9933LG-G are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Device Type: DC DC Controller with step-down (buck) and step-up (boost) topology capability
• Number of Outputs: Single output configuration
• Dimming Method: PWM dimming support
• Package Compatibility: Surface mount packages suitable for LED driver applications
• Supply Voltage Range: Maximum supply voltage of 40V or greater to accommodate the AT9933LG-G's 75V maximum rating
• Automotive Compliance: AEC-Q100 qualification and automotive-grade designation where applicable
• RoHS Compliance: ROHS3 compliant status

Substitution Logic: Parts are grouped as equivalent when they maintain the core DC-DC controller functionality with PWM dimming in single-output configurations. Voltage supply ranges, package types, and operating temperature ranges may vary within acceptable engineering tolerances. Parts with lower maximum supply voltages (40V-65V) are suitable for applications where the full 75V capability of the AT9933LG-G is not required. Package variations (8-SOIC, 20-HTSSOP, 28-QFN, 48-VQFN) are acceptable provided the electrical interface and thermal characteristics support the intended application.

Parameter Comparison

Engineering Selection Recommendations

Parametric Equivalent - HV9930LG-G (Microchip Technology)

The HV9930LG-G maintains identical package form factor (8-SOIC) and core DC-DC controller architecture with buck-boost topology and PWM dimming. This part is suitable for applications where the AT9933LG-G supply voltage range (up to 75V) exceeds system requirements. The HV9930LG-G supports supply voltages up to 200V, providing extended headroom for high-voltage applications. Both parts share automotive-grade operating temperature range (-40°C to 125°C) and ROHS3 compliance. Inventory availability is higher for HV9930LG-G (6,992 units).

MFR Recommended - LT3791MPFE#PBF (Analog Devices Inc.)

The LT3791MPFE#PBF is a DC-DC controller with buck-boost topology and dual dimming capability (analog and PWM). This part operates within a 4.7V to 60V supply range and includes extended operating temperature range (-55°C to 150°C junction temperature). The 38-TSSOP package with exposed pad provides enhanced thermal performance compared to the 8-SOIC form factor. Frequency range of 200-700kHz supports flexible design implementations. This part is suitable for lighting applications requiring both analog and PWM dimming control.

MFR Recommended - LT8391IUFD#PBF (Analog Devices Inc.)

The LT8391IUFD#PBF is a DC-DC controller in 28-QFN package with buck-boost topology, dual dimming modes (analog and PWM), and automotive-grade qualification. Supply voltage range of 4V to 60V and operating temperature range of -40°C to 125°C align with automotive requirements. Frequency range of 150-700kHz provides design flexibility. This part is suitable for automotive LED driver applications requiring compact QFN packaging.

MFR Recommended - TLD5190QVXUMA1 (Infineon Technologies)

The TLD5190QVXUMA1 is an automotive-grade DC-DC controller with buck-boost topology in 48-VQFN package. Supply voltage range of 4.5V to 40V and operating temperature range of -40°C to 150°C support automotive applications. Frequency range of 200-700kHz and dual dimming capability (analog and PWM) provide design flexibility. This part is part of the LITIX™ series and is suitable for applications where the AT9933LG-G maximum supply voltage exceeds requirements.

MFR Recommended - TPS92692QPWPRQ1 (Texas Instruments)

The TPS92692QPWPRQ1 is an automotive-grade DC-DC controller with AEC-Q100 qualification, matching the AT9933LG-G compliance profile. Supply voltage range of 4.5V to 65V and operating temperature range of -40°C to 125°C align with automotive standards. The 20-HTSSOP package provides a mid-range form factor between 8-SOIC and larger packages. Frequency range of 80-800kHz and dual dimming capability (analog and PWM) support lighting and signage applications.

Frequently Asked Questions (FAQ)

Q: Can the HV9930LG-G directly replace the AT9933LG-G in existing PCB designs?

A: Yes, the HV9930LG-G is a parametric equivalent with identical 8-SOIC package dimensions and pinout compatibility. Both parts are Microchip Technology DC-DC controllers with buck-boost topology and PWM dimming. The HV9930LG-G supports higher maximum supply voltage (200V vs. 75V), making it suitable for applications where the AT9933LG-G supply range is not fully utilized.

Q: What are the key differences between the Analog Devices LT3791MPFE#PBF and LT8391IUFD#PBF options?

A: Both parts are Analog Devices DC-DC controllers with buck-boost topology and dual dimming modes (analog and PWM). The LT3791MPFE#PBF uses a 38-TSSOP package with extended operating temperature range (-55°C to 150°C junction temperature), while the LT8391IUFD#PBF uses a 28-QFN package with automotive-grade qualification and -40°C to 125°C operating range. Package selection depends on PCB layout constraints and thermal management requirements.

Q: Is the STCS05ADR a suitable substitute for the AT9933LG-G?

A: The STCS05ADR is not a suitable substitute. While it is an 8-SOIC LED driver with PWM dimming, it is a linear topology device with 500mA output current specification, not a DC-DC controller with buck-boost capability. The STCS05ADR lacks the step-down and step-up conversion functionality required for AT9933LG-G applications.

Q: What packaging options are available among the substitute parts?

A: Substitute parts are available in multiple surface mount packages: 8-SOIC (HV9930LG-G), 38-TSSOP with exposed pad (LT3791MPFE#PBF), 28-QFN (LT8391IUFD#PBF), 48-VQFN (TLD5190QVXUMA1), and 20-HTSSOP (TPS92692QPWPRQ1). Package selection depends on PCB layout constraints, thermal dissipation requirements, and design density considerations.

Q: Do all substitute parts maintain automotive-grade qualification?

A: Automotive-grade qualification varies among substitutes. The AT9933LG-G, LT8391IUFD#PBF, TLD5190QVXUMA1, and TPS92692QPWPRQ1 all carry automotive-grade designation. The HV9930LG-G and LT3791MPFE#PBF do not specify automotive-grade classification in the provided parameters. For applications requiring AEC-Q100 qualification, the TPS92692QPWPRQ1 explicitly matches the AT9933LG-G certification level.

Q: What is the significance of supply voltage range differences among substitute parts?

A: Supply voltage range determines the maximum input voltage the controller can safely process. The AT9933LG-G supports up to 75V, while most substitutes support 40V to 65V maximum. For applications requiring the full 75V capability, the HV9930LG-G (200V maximum) is the only substitute that exceeds the original specification. For applications operating below 65V, all substitutes are suitable.

Q: Are there differences in dimming capability between the AT9933LG-G and substitute parts?

A: The AT9933LG-G supports PWM dimming only. Most substitute parts (LT3791MPFE#PBF, LT8391IUFD#PBF, TLD5190QVXUMA1, TPS92692QPWPRQ1) support both analog and PWM dimming modes, providing additional design flexibility. The HV9930LG-G maintains PWM-only dimming matching the original part.