MP4651ES-LF LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP4651ES-LF is an AC DC offline switcher LED driver IC manufactured by Monolithic Power Systems Inc., designed for backlight and lighting applications. This half-bridge topology device operates across a 9V to 30V supply range with PWM dimming capability at 50kHz frequency in a 16-SOIC package. The part is currently active in production with ROHS3 compliance and 1111 units in stock.

Substitute parts are necessary when the MP4651ES-LF becomes unavailable, when alternative package sizes are required for PCB layout optimization, or when extended operating temperature ranges are needed for specific application environments.

Key Parameters

Parameter	MP4651ES-LF
Manufacturer	Monolithic Power Systems Inc.
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Half-Bridge
Number of Outputs	1
Voltage Supply Range	9V to 30V
Frequency	50kHz
Dimming	PWM
Package / Case	16-SOIC (0.154", 3.90mm Width)
Operating Temperature	-20°C to 85°C (TA)
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	2 (1 Year)

Substitute Part Grouping Explanation

Substitution eligibility for the MP4651ES-LF is determined by the following critical parameters:

Primary Substitution Criteria:

AC DC offline switcher topology
Single output configuration
Supply voltage range compatibility (minimum 9V, maximum 30V overlap required)
Dimming capability (PWM or compatible dimming method)
Surface mount package type
Active or recently active product status
ROHS3 compliance

Secondary Considerations:

Operating temperature range (extended ranges acceptable)
Package case dimensions (alternative packages acceptable if PCB layout permits)
Frequency operation (variation acceptable within LED driver specifications)
Moisture sensitivity level (higher MSL acceptable for controlled environments)

The substitute parts listed below meet these criteria with varying topology implementations (half-bridge, buck, flyback, boost) and package configurations, all suitable for LED driver applications in backlight and lighting systems.

Parameter Comparison

Parameter	MP4651ES-LF	MP4653GY	FL7701MX	LT3799IMSE-1#PBF	RT7310GE	RT8465ZS
Manufacturer	MPS	MPS	Fairchild	Analog Devices	Richtek	Richtek
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
Topology	Half-Bridge	Half-Bridge	Step-Down (Buck)	Flyback	Flyback, Buck, Boost	Step-Up (Boost)
Number of Outputs	1	1	1	1	1	1
Voltage Supply (Min)	9V	9V	9V	—	12V	8V
Voltage Supply (Max)	30V	30V	20V	—	25V	32V
Dimming	PWM	Analog, PWM	Analog	Triac	Triac	—
Package / Case	16-SOIC	20-SOIC	8-SOIC	16-TFSOP (Exposed Pad)	SOT-23-6	8-SOIC
Operating Temperature	-20°C to 85°C (TA)	-40°C to 125°C (TJ)	-40°C to 125°C (TA)	-40°C to 125°C (TJ)	-40°C to 85°C (TA)	-40°C to 85°C (TA)
Product Status	Active	Active	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	2 (1 Year)	3 (168 Hours)	—	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

MP4653GY (Monolithic Power Systems Inc.): Direct manufacturer alternative with identical supply voltage range (9V–30V) and half-bridge topology. Supports both analog and PWM dimming modes, providing enhanced flexibility. Extended operating temperature range (-40°C to 125°C) suitable for industrial environments. Larger 20-SOIC package requires PCB layout verification. ROHS3 compliant with active production status.

FL7701MX (Fairchild Semiconductor): Buck topology substitute with reduced supply voltage maximum (20V vs. 30V). Compact 8-SOIC package enables space-constrained designs. Analog dimming only; PWM dimming not supported. Extended operating temperature range (-40°C to 125°C). Active production status. Suitable for applications within 9V–20V supply envelope.

LT3799IMSE-1#PBF (Analog Devices Inc.): Flyback topology with triac dimming capability. Operates across extended frequency range (25kHz–300kHz). Superior moisture sensitivity (MSL 1, unlimited shelf life). 16-TFSOP package with exposed pad for thermal management. ROHS3 compliant. Supply voltage specifications not provided; application-specific verification required. Active production status.

RT7310GE (Richtek USA Inc.): Multi-topology device supporting flyback, buck, and boost configurations. Triac dimming only; PWM dimming not supported. Supply voltage range 12V–25V (narrower than MP4651ES-LF). Compact SOT-23-6 package for minimal footprint. ROHS3 compliant with active production status. Suitable for fixed-input voltage applications.

RT8465ZS (Richtek USA Inc.): Boost topology with extended supply voltage range (8V–32V). Obsolete product status limits long-term availability. No dimming specification provided. 8-SOIC package. ROHS3 compliant. Not recommended for new designs due to obsolescence.

Frequently Asked Questions (FAQ)

Q: Can MP4653GY directly replace MP4651ES-LF without circuit modifications?

A: MP4653GY shares identical supply voltage range (9V–30V), half-bridge topology, and single-output configuration. The primary difference is package size (20-SOIC vs. 16-SOIC) and enhanced dimming modes (analog + PWM vs. PWM only). PCB layout must accommodate the larger package footprint. Firmware or control logic may require adjustment to utilize analog dimming if not previously implemented.

Q: Why does FL7701MX have a lower maximum supply voltage (20V vs. 30V)?

A: FL7701MX implements a step-down (buck) topology, which inherently limits maximum input voltage to approximately 20V for safe operation and efficiency. Applications requiring 25V–30V input must use alternative topologies (half-bridge, flyback, or boost) such as MP4653GY or LT3799IMSE-1#PBF.

Q: What is the significance of dimming method differences (PWM vs. Triac vs. Analog)?

A: Dimming method determines control interface compatibility. PWM dimming uses digital pulse-width modulation signals. Triac dimming interfaces with AC line-voltage phase-control dimmers. Analog dimming uses DC voltage control. MP4651ES-LF requires PWM control; substitutes with different dimming methods require corresponding control circuit redesign.

Q: Is RT8465ZS suitable for new product designs?

A: No. RT8465ZS carries obsolete product status, indicating discontinued manufacturing and limited future availability. New designs should select from active-status alternatives: MP4653GY, FL7701MX, LT3799IMSE-1#PBF, or RT7310GE.

Q: How do operating temperature ranges affect part selection?

A: MP4651ES-LF operates -20°C to 85°C. Substitutes with extended ranges (-40°C to 125°C) are suitable for all MP4651ES-LF applications and additionally support industrial or automotive environments. Temperature range does not restrict backward compatibility; extended-range parts function normally in standard temperature environments.

Q: What package considerations apply when substituting?

A: MP4651ES-LF uses 16-SOIC (3.90mm width). Substitutes employ 20-SOIC, 8-SOIC, 16-TFSOP, or SOT-23-6 packages. Smaller packages (8-SOIC, SOT-23-6) reduce PCB footprint but may require layout redesign. Larger packages (20-SOIC) require additional board space. Pin configuration and function mapping must be verified against schematic requirements.

Q: Are all substitutes ROHS3 compliant?

A: Five of six listed substitutes carry explicit ROHS3 compliance certification. FL7701MX compliance status is not specified in available data. For applications requiring verified ROHS3 compliance, select MP4653GY, LT3799IMSE-1#PBF, RT7310GE, or RT8465ZS.

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