HV9971LG-G LED Driver IC Equivalent & Substitute Parts

Part Overview

The HV9971LG-G is an AC DC offline switcher LED driver IC manufactured by Microchip Technology, designed for flyback topology applications with PWM dimming capability. This component operates across a wide AC input voltage range (80VAC to 264VAC) and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for design continuity, production planning, and long-term product support.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Part Number	HV9971LG-G
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Flyback
Number of Outputs	1
Voltage Supply (Min)	80VAC
Voltage Supply (Max)	264VAC
Frequency	100kHz
Dimming	PWM
Internal Switch(s)	No
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the HV9971LG-G are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

AC DC offline switcher topology with flyback configuration
Single output channel
PWM dimming capability
Operating temperature range compatibility (-40°C minimum)
Surface mount packaging preference for direct PCB replacement
ROHS3 compliance and RoHS certification status

Substitution Logic: Parts are classified into two categories based on input voltage handling and package compatibility:

Direct AC Input Substitutes (HVLED815PFTR, LNK407LG, LNK408LG, LNK409EG, LNK419EG): These parts accept high AC voltage inputs (36V–725V) or direct AC rectification, maintaining the offline switcher architecture. These are primary candidates for direct replacement in AC-powered LED driver applications.
DC Input Substitutes (LC5546LD, LM3447MTX/NOPB, MP4026GJ-P, MP4032-1GS, TPS92314D/NOPB): These parts operate on lower DC voltage supplies (7.5V–35V) and are suitable for applications where AC input is pre-rectified or where DC supply is available. These require circuit topology evaluation before substitution.

Parameter Comparison

Parameter	HV9971LG-G	HVLED815PFTR	LC5546LD	LM3447MTX/NOPB	LNK407LG	LNK408LG	LNK409EG	LNK419EG	MP4026GJ-P	MP4032-1GS	TPS92314D/NOPB
Manufacturer	Microchip	STMicroelectronics	Sanken Electric	Texas Instruments	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Monolithic Power	Monolithic Power	Texas Instruments
Type	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher
Topology	Flyback	Flyback	—	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback
Number of Outputs	1	1	1	1	1	1	1	1	1	1	1
Voltage Supply (Min)	80VAC	11.5V	—	7.5V	36V	36V	36V	36V	9.8V	10.3V	13V
Voltage Supply (Max)	264VAC	23V	20V	17.5V	725V	725V	725V	725V	27V	27V	35V
Frequency	100kHz	166kHz	—	—	66kHz	66kHz	66kHz	66kHz	—	—	60kHz–150kHz
Dimming	PWM	PWM	—	Triac	Triac	Triac	Triac	PWM	—	Triac	—
Internal Switch(s)	No	Yes	Yes	No	Yes	Yes	Yes	Yes	No	Yes	No
Operating Temperature	-40°C ~ 125°C	-40°C ~ 150°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 150°C	—	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-SOIC	16-SOIC	8-DIP	14-TSSOP	7-SSIP eSIP-7F	7-SSIP eSIP-7F	7-SSIP eSIP-7C	7-SSIP eSIP-7C	SOT-23-6	8-SOIC-7A	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)

Engineering Selection Recommendations

For Direct AC Input Applications (80VAC–264VAC):

LNK419EG is the primary recommended substitute. It maintains flyback topology, PWM dimming capability, and operates across the full AC voltage range (36V–725V after rectification). Product status is active with ROHS3 compliance and unlimited MSL rating. Operating temperature extends to 150°C, providing thermal margin beyond the original specification.

HVLED815PFTR offers an alternative with active product status and ROHS3 compliance. However, its maximum supply voltage (23V) limits direct AC input application without additional circuit modifications. This part is suitable only for pre-rectified DC supply scenarios.

For DC Supply Applications (Pre-Rectified Input):

MP4032-1GS provides a surface-mount 8-SOIC package option with active status and ROHS3 compliance. Supply voltage range (10.3V–27V) accommodates rectified AC input. Triac dimming differs from the original PWM specification; circuit topology evaluation is required.

TPS92314D/NOPB offers active status with ROHS3 compliance and 8-SOIC package compatibility. Supply voltage range (13V–35V) supports rectified AC applications. Frequency range (60kHz–150kHz) encompasses the original 100kHz specification.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance or equivalent RoHS certification. MSL ratings of 1 (unlimited) are preferred for manufacturing flexibility; parts with MSL 2 or 3 require controlled storage conditions.

Frequently Asked Questions (FAQ)

Q: Can HVLED815PFTR directly replace HV9971LG-G in an 80VAC–264VAC application?

A: No. HVLED815PFTR maximum supply voltage is 23V, insufficient for direct AC input. It requires a pre-rectified DC supply. Circuit redesign is necessary for substitution.

Q: What is the key difference between LNK409EG and LNK419EG?

A: Both operate across 36V–725V supply range with flyback topology and 3.26A output current. LNK409EG uses triac dimming; LNK419EG uses PWM dimming. For PWM dimming applications matching the original HV9971LG-G, LNK419EG is the appropriate choice.

Q: Are through-hole packages (LNK407LG, LNK408LG, LNK409EG, LNK419EG) suitable replacements for the surface-mount 8-SOIC HV9971LG-G?

A: Through-hole packages require PCB layout redesign and different mounting techniques. If surface-mount compatibility is required, select MP4032-1GS, TPS92314D/NOPB, or MP4026GJ-P. Through-hole substitutes are viable only if PCB redesign is acceptable.

Q: What does MSL rating mean for component selection?

A: MSL (Moisture Sensitivity Level) indicates storage and handling requirements. MSL 1 (unlimited) parts have no moisture-related restrictions. MSL 2 and 3 parts require controlled humidity storage and have limited shelf life. For manufacturing flexibility, MSL 1 parts are preferred.

Q: Can I substitute a triac-dimming part for the PWM-dimming HV9971LG-G?

A: Triac and PWM dimming are distinct control methods. Triac dimming requires phase-cut AC input; PWM dimming uses pulse-width modulation on DC. Substitution requires circuit topology evaluation and may necessitate control signal modifications.

Q: Which substitute offers the closest electrical match to HV9971LG-G?

A: LNK419EG provides the closest functional match: AC DC offline switcher, flyback topology, PWM dimming, single output, and wide supply voltage range (36V–725V). It maintains active product status, ROHS3 compliance, and unlimited MSL rating.

Q: Are there inventory considerations for substitute selection?

A: Yes. LNK419EG has 35,920 units in stock; LNK409EG has 17,200 units. Both offer substantial availability. MP4032-1GS (5,648 units) and HVLED815PFTR (39,335 units) also provide adequate stock levels for production planning.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message