MP4651ES-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

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

The MP4651ES-LF-Z carries a "Not For New Designs" product status, indicating it has been superseded or discontinued for new applications. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support legacy system maintenance or redesign initiatives.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP4651ES-LF-Z
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 Method	PWM
Package / Case	16-SOIC (0.154", 3.90mm Width)
Operating Temperature	-20°C to 85°C (TA)
Product Status	Not For New Designs
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MP4651ES-LF-Z is determined by the following critical parameters:

Primary Substitution Criteria:

AC DC offline switcher topology with single output
Supply voltage range compatibility (9V to 30V minimum overlap)
PWM dimming capability
Surface mount packaging suitable for the application
Active product status for long-term availability

Secondary Compatibility Factors:

Operating temperature range (-20°C to 85°C minimum requirement)
RoHS3 compliance and regulatory alignment
Internal switch configuration (No internal switches required)
Frequency operation range

The substitute parts listed below meet these criteria with varying topology implementations (half-bridge, step-down buck, or flyback) and dimming methods (PWM, analog, or triac), each suitable for specific application requirements within the LED driver IC category.

Parameter Comparison

Parameter	MP4651ES-LF-Z	MP4653GY-Z	HV9801ALG-G	LM3444MMX/NOPB	LM3445MM/NOPB	LM3445MMX/NOPB	LM3447MTE/NOPB	LM3450AMT/NOPB
Manufacturer	Monolithic Power Systems Inc.	Monolithic Power Systems Inc.	Microchip Technology	National Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	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
Topology	Half-Bridge	Half-Bridge	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Flyback	Flyback, Step-Up (Boost)
Number of Outputs	1	1	1	1	1	1	1	1
Voltage Supply (Min)	9V	9V	15V	8V	8V	8V	7.5V	8.5V
Voltage Supply (Max)	30V	30V	450V	13V	12V	12V	17.5V	20V
Dimming Method	PWM	Analog, PWM	PWM	Analog	Triac	Triac	Triac	Analog
Package / Case	16-SOIC	20-SOIC	8-SOIC	10-VSSOP	10-VSSOP	10-VSSOP	14-TSSOP	16-TSSOP
Operating Temperature (Min)	-20°C	-40°C	-40°C	-40°C	-40°C	-40°C	-40°C	-40°C
Operating Temperature (Max)	85°C	125°C	125°C	125°C	125°C	125°C	125°C	125°C
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Internal Switch(s)	No	No	No	No	No	No	No	Yes

Engineering Selection Recommendations

MP4653GY-Z (Monolithic Power Systems Inc.) Recommended as the primary direct substitute. Maintains half-bridge topology and identical supply voltage range (9V to 30V). Offers enhanced dimming flexibility with both analog and PWM capability. Active product status ensures long-term availability. Wider operating temperature range (-40°C to 125°C) provides superior thermal performance. Package upgrade to 20-SOIC requires PCB layout modification. ROHS3 compliant with higher inventory availability (63,800 units).

HV9801ALG-G (Microchip Technology) Suitable for applications requiring extended input voltage tolerance (15V to 450V). Step-down buck topology differs from the original half-bridge design, requiring circuit redesign. PWM dimming maintained. Compact 8-SOIC package reduces board space. Active product status. ROHS3 compliant. Frequency operation at 1.2kHz differs significantly from the 50kHz original specification.

LM3444MMX/NOPB (National Semiconductor) Step-down buck topology with analog dimming only. Restricted supply voltage range (8V to 13V) limits application scope compared to the original 9V to 30V range. Active product status. Compact 10-VSSOP package. Suitable for lower voltage lighting applications. RoHS status not specified in available data.

LM3445MM/NOPB and LM3445MMX/NOPB (Texas Instruments) Functionally equivalent pair with step-down buck topology and triac dimming capability. Supply voltage range (8V to 12V) is narrower than the original specification. Active product status with strong inventory availability (21,100 and 3,600 units respectively). ROHS3 compliant. Frequency range 30kHz to 1MHz accommodates diverse lighting control requirements. 10-VSSOP package requires layout redesign.

LM3447MTE/NOPB (Texas Instruments) Flyback topology with triac dimming for specialized lighting applications. Supply voltage range (7.5V to 17.5V) provides moderate compatibility. Active product status. ROHS3 compliant. 14-TSSOP package. Specified output voltage of 19V indicates application-specific design.

LM3450AMT/NOPB (Texas Instruments) Flyback with step-up boost topology and analog dimming. Features internal switch capability, differentiating it from the original design. Supply voltage range (8.5V to 20V) overlaps partially with the original specification. Active product status. ROHS3 compliant. 16-TSSOP package maintains similar pin count to the original 16-SOIC.

Frequently Asked Questions (FAQ)

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

A: MP4653GY-Z maintains functional compatibility in topology (half-bridge), supply voltage range (9V to 30V), and dimming method (PWM). However, the package change from 16-SOIC to 20-SOIC requires PCB footprint modification. Pin-to-pin compatibility must be verified against detailed datasheets before implementation.

Q: Why do substitute parts have different topologies (buck, flyback) compared to the original half-bridge design?

A: AC DC offline switcher LED drivers employ multiple topologies to achieve similar functional outcomes across different application requirements. Half-bridge, step-down buck, and flyback topologies each offer distinct advantages in efficiency, component count, and thermal performance. Topology selection depends on specific circuit requirements, output voltage, and power delivery specifications.

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

A: The original MP4651ES-LF-Z operates across 9V to 30V, providing broad input compatibility. Substitute parts with narrower ranges (such as LM3444MMX/NOPB at 8V to 13V) are suitable only for applications within their specified limits. Verify your circuit's input voltage requirements against each substitute's minimum and maximum ratings before selection.

Q: How does the dimming method affect part selection?

A: The original MP4651ES-LF-Z uses PWM dimming. Substitutes offer PWM, analog, or triac dimming methods. PWM dimming provides digital control suitable for microcontroller integration. Analog dimming requires voltage-based control signals. Triac dimming enables compatibility with AC line-level dimmer switches. Select based on your system's control architecture.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts listed are ROHS3 compliant. LM3444MMX/NOPB does not specify RoHS status in available documentation. Verify compliance requirements for your application and request detailed datasheets from manufacturers when RoHS status is not explicitly stated.

Q: What packaging considerations apply when switching from 16-SOIC to alternative packages?

A: Package changes require PCB footprint redesign and potential layout modifications. 16-SOIC (0.154" width) differs from 20-SOIC (0.295" width), 8-SOIC (0.154" width), 10-VSSOP (0.118" width), 14-TSSOP (0.173" width), and 16-TSSOP (0.173" width). Pin count and spacing vary accordingly. Consult package datasheets and design guidelines before implementing layout changes.

Q: Why is MP4651ES-LF-Z marked "Not For New Designs"?

A: This status indicates the part has been superseded or is in end-of-life phase. Manufacturers assign this designation to encourage migration to newer, actively supported alternatives. For new designs, select from active-status substitutes such as MP4653GY-Z, HV9801ALG-G, or Texas Instruments LM series parts.

Q: Can I use LM3450AMT/NOPB as a substitute if my application requires an internal switch?

A: Yes. LM3450AMT/NOPB is the only substitute listed with an internal switch capability, differentiating it from the original MP4651ES-LF-Z (no internal switch). If your circuit design requires integrated switching functionality, this part offers that feature. Verify topology compatibility (flyback with step-up boost) against your application requirements.

Q: How do operating temperature ranges affect long-term reliability?

A: The original MP4651ES-LF-Z operates from -20°C to 85°C. Most substitutes extend this range to -40°C to 125°C, providing enhanced thermal margin and reliability in extreme environments. If your application operates within the original temperature range, both the original and substitute specifications are acceptable. For applications approaching temperature extremes, wider-range substitutes offer additional safety margin.

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