HV9986K6-G LED Driver Controller Equivalent & Substitute Parts

Part Overview

The HV9986K6-G is a 3-output LED driver controller IC manufactured by Microchip Technology, designed for backlight applications. It integrates SEPIC, step-down (buck), and step-up (boost) topologies with analog and PWM dimming capabilities in a 40-QFN (6x6) surface mount package. The device operates across a 10V to 40V supply range with switching frequencies of 125kHz and 500kHz.

The HV9986K6-G is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications requiring this controller topology and performance envelope.

Substiute Parts

HV9986K6-G

Microchip TechnologyIn Stock: 1006HV9986K6-G Datasheet

Current PartRFQ

HV9985K6-G

Microchip TechnologyIn Stock: 1520HV9985K6-G Datasheet

Parametric EquivalentRFQ

LT3797EUKG#TRPBF

Analog Devices Inc.In Stock: 1956LT3797EUKG#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HV9986K6-G are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Topology support: SEPIC, step-down (buck), and step-up (boost) configurations
• Number of outputs: 3-output architecture
• Supply voltage range: Minimum 10V to maximum 40V operation
• Dimming control: Analog and PWM dimming capability
• Package type: Surface mount QFN with exposed pad
• Operating temperature range: -40°C to 125°C
• Application class: LED driver controller for backlight systems

Substitution Categories:

1. Parametric Equivalent (Same Manufacturer): HV9985K6-G maintains identical electrical specifications, topology, output count, and voltage range while offering active product status and improved inventory availability.

2. Manufacturer Recommended Substitute (Cross-Manufacturer): LT3797EUKG#TRPBF provides equivalent topology support and dimming control with extended supply voltage range (2.5V to 40V) and broader frequency capability (100kHz to 1MHz), though in a larger 52-QFN package.

Parameter Comparison

Engineering Selection Recommendations

HV9985K6-G (Parametric Equivalent - Preferred for Direct Replacement): This part is the optimal choice for direct substitution. It maintains identical electrical specifications, topology configuration, and package footprint as the HV9986K6-G. The primary advantage is active product status with superior inventory availability (1435 units in stock versus 921 units for the obsolete HV9986K6-G). Both parts carry ROHS3 compliance and equivalent MSL ratings. Selection of HV9985K6-G eliminates design modifications and PCB layout changes.

LT3797EUKG#TRPBF (Manufacturer Recommended - Design Modification Required): This part is suitable when design flexibility permits package and layout changes. It offers active product status, extended supply voltage range (2.5V minimum), broader frequency capability (100kHz to 1MHz), and automotive-grade qualification. The 52-QFN package is larger than the 40-QFN footprint, requiring PCB redesign. The lower MSL rating (1 versus 3) provides superior moisture tolerance. This option is appropriate for new designs or redesigns targeting automotive or extended environmental applications.

Frequently Asked Questions (FAQ)

Q: Can HV9985K6-G be used as a direct drop-in replacement for HV9986K6-G? A: Yes. The HV9985K6-G is a parametric equivalent with identical electrical specifications, topology support, output configuration, voltage range, frequency operation, and package footprint. No design modifications are required.

Q: What are the key differences between HV9985K6-G and LT3797EUKG#TRPBF? A: The primary differences are package size (40-QFN versus 52-QFN), minimum supply voltage (10V versus 2.5V), frequency range (125kHz/500kHz fixed versus 100kHz to 1MHz programmable), and automotive qualification (not specified versus automotive grade). The LT3797EUKG#TRPBF requires PCB layout redesign due to package size change.

Q: Why is the HV9986K6-G classified as obsolete? A: Product obsolescence is determined by the manufacturer based on market demand, technology evolution, and production decisions. The HV9985K6-G serves as the active replacement within the Microchip product line.

Q: Are all substitute parts ROHS3 compliant? A: Yes. Both HV9985K6-G and LT3797EUKG#TRPBF are ROHS3 compliant, matching the compliance status of the HV9986K6-G.

Q: What is the impact of package size difference when using LT3797EUKG#TRPBF? A: The LT3797EUKG#TRPBF uses a 52-QFN (7x8) package compared to the 40-QFN (6x6) package of HV9986K6-G. This requires PCB footprint redesign, trace routing modifications, and thermal management evaluation. Pin-to-pin compatibility is not guaranteed.

Q: Which substitute part should be selected for new designs? A: For new designs without existing PCB constraints, LT3797EUKG#TRPBF is recommended due to active product status, extended voltage range, broader frequency capability, and automotive qualification. For designs requiring minimal modification, HV9985K6-G is the appropriate choice.

Q: Are there any temperature rating differences between the parts? A: All three parts operate across -40°C to 125°C. The HV9986K6-G and HV9985K6-G specify junction temperature (TJ), while LT3797EUKG#TRPBF specifies ambient temperature (TA). Both measurement methods are valid for the specified range.