MM5451BV LED Driver IC - Equivalent & Substitute Parts

Part Overview

The MM5451BV is a Microchip Technology LED driver IC in 44-PLCC packaging, designed for serial interface LED display applications. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The MM5451BV operates with a 4.75V to 11V supply voltage and 10 mA supply current, serving as a dedicated display driver for LED-based systems requiring serial communication protocols.

Substiute Parts

MM5451BV

Microchip TechnologyIn Stock: 8425MM5451BV Datasheet

Current PartRFQ

MM5451YV

Microchip TechnologyIn Stock: 1546MM5451YV Datasheet

DirectRFQ

MAX6956AAI+

Analog Devices Inc./Maxim IntegratedIn Stock: 3253MAX6956AAI+ Datasheet

MFR RecommendedRFQ

MAX6956AAI+T

Analog Devices Inc./Maxim IntegratedIn Stock: 5737MAX6956AAI+T Datasheet

MFR RecommendedRFQ

MAX6956AAX+

Analog Devices Inc./Maxim IntegratedIn Stock: 3152MAX6956AAX+ Datasheet

MFR RecommendedRFQ

MAX6956AAX+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1989MAX6956AAX+T Datasheet

MFR RecommendedRFQ

MAX6956ATL+

Analog Devices Inc./Maxim IntegratedIn Stock: 2412MAX6956ATL+ Datasheet

MFR RecommendedRFQ

MAX6956ATL+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3869MAX6956ATL+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM5451BV is determined by the following critical parameters:

• Display Driver Function: All substitute parts are LED driver ICs with serial or I2C interface capability
• Supply Voltage Range: The MM5451BV operates at 4.75V ~ 11V; substitutes must support overlapping or compatible voltage ranges
• Interface Protocol: The original part uses serial interface; substitutes include both serial (MM5451YV) and I2C interface variants (MAX6956 series)
• Package Compatibility: Physical package differences (44-PLCC vs. 28-SSOP, 36-SSOP, 40-TQFN) require PCB redesign considerations
• Product Status & Compliance: Active product status and RoHS3 compliance are available in substitute options
• Operating Temperature Range: Substitutes maintain or exceed the -40°C ~ 85°C operating range

The MM5451YV represents a direct Microchip equivalent with identical electrical specifications but active product status. The MAX6956 series (Analog Devices/Maxim Integrated) offers enhanced functionality with I2C interface, lower supply current (180 µA vs. 10 mA), and extended temperature range (-40°C ~ 125°C), though package changes are required.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Same Manufacturer, Same Package): MM5451YV is the recommended direct substitute for MM5451BV. Both parts are manufactured by Microchip Technology, maintain identical electrical specifications (10 mA supply current, 4.75V ~ 11V supply voltage, -40°C ~ 85°C operating range), and use the same 44-LCC (J-Lead) package. The MM5451YV is currently in active production status with RoHS3 compliance, eliminating the obsolescence issue while preserving PCB compatibility.

Alternative Solutions (Different Manufacturer, Package Change Required): The MAX6956 series from Analog Devices/Maxim Integrated provides enhanced functionality with I2C interface capability, significantly lower supply current (180 µA), extended operating temperature range (-40°C ~ 125°C), and superior MSL rating (1 vs. 3). These advantages require PCB redesign due to package changes:

• MAX6956AAI+ / MAX6956AAI+T: 28-SSOP package, 20/28 port configuration
• MAX6956AAX+ / MAX6956AAX+T: 36-BSOP package, expanded port configuration
• MAX6956ATL+ / MAX6956ATL+T: 40-TQFN (6x6) package, optimal for space-constrained designs

All MAX6956 variants are RoHS3 compliant with unlimited MSL rating, suitable for modern manufacturing environments. Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) accommodate different procurement and assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can MM5451YV be used as a direct drop-in replacement for MM5451BV? A: Yes. The MM5451YV is electrically and mechanically identical to MM5451BV, using the same 44-LCC package and maintaining all electrical specifications. No PCB modifications are required. The primary advantage is active product status and RoHS3 compliance.

Q: What are the key differences between MM5451YV and MAX6956 series substitutes? A: The MM5451YV maintains serial interface communication, while MAX6956 variants use I2C interface. MAX6956 parts consume significantly less supply current (180 µA vs. 10 mA), operate across a lower voltage range (2.5V ~ 5.5V vs. 4.75V ~ 11V), and support extended temperature operation (-40°C ~ 125°C). All MAX6956 variants require PCB redesign due to different package footprints.

Q: Which MAX6956 package should be selected for new designs? A: Package selection depends on PCB space constraints and port requirements. The 28-SSOP (MAX6956AAI+/AAI+T) is the most compact for basic applications. The 36-BSOP (MAX6956AAX+/AAX+T) provides expanded port capacity. The 40-TQFN (MAX6956ATL+/ATL+T) offers optimal thermal performance and is suitable for high-density layouts.

Q: Are there packaging format differences among MAX6956 variants? A: Yes. MAX6956AAI+, MAX6956AAX+, and MAX6956ATL+ are supplied in Tube packaging. MAX6956AAI+T, MAX6956AAX+T, and MAX6956ATL+T are supplied in Tape & Reel (TR) or Cut Tape & Digi-Reel format. Selection depends on assembly line requirements and order quantities.

Q: What is the MSL (Moisture Sensitivity Level) impact on component handling? A: MM5451BV and MM5451YV have MSL 3 rating (168-hour floor life), requiring controlled storage and bake-out procedures before reflow soldering. All MAX6956 variants have MSL 1 rating (unlimited floor life), eliminating moisture sensitivity concerns and simplifying inventory management.

Q: Is the voltage supply range difference between MM5451 and MAX6956 critical? A: Yes. MM5451 series operates at 4.75V ~ 11V, while MAX6956 operates at 2.5V ~ 5.5V. System power supply design must be verified for compatibility. If the application requires voltages above 5.5V, MM5451YV is the appropriate choice. If the application operates within 2.5V ~ 5.5V range, MAX6956 variants offer superior efficiency.

Q: Can MAX6956 I2C interface replace MM5451 serial interface without firmware changes? A: No. I2C and serial interfaces require different communication protocols and firmware implementation. Switching from MM5451 (serial) to MAX6956 (I2C) requires firmware redesign and system-level integration changes.