MM5451YN LED Driver Equivalent & Substitute Parts

Part Overview

The MM5451YN is an active LED driver IC manufactured by Microchip Technology, designed for display applications requiring serial interface control. This 40-pin DIP through-hole component operates across a 4.75V to 11V supply range with 10 mA supply current. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating, making it suitable for standard industrial and commercial applications. Substitute parts are identified based on functional equivalence in LED driver capability, interface compatibility, and compliance certifications.

Key Parameters

Parameter	MM5451YN
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Display Type	LED
Interface	Serial
Current - Supply	10 mA
Voltage - Supply	4.75V ~ 11V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)
Product Status	Active
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MM5451YN are identified from the MAX6956 family manufactured by Analog Devices Inc./Maxim Integrated. Substitution is based on the following criteria:

Functional category: LED driver IC for display applications
Product status: All substitutes are active components
Compliance: All substitutes maintain ROHS3 compliance and unlimited MSL rating
Interface capability: MAX6956 variants support I2C interface, providing digital control equivalent to serial interface operation
Supply voltage range: MAX6956 operates at 2.5V ~ 5.5V, which overlaps with the MM5451YN upper operating range
Operating temperature: MAX6956 extends to -40°C ~ 125°C, covering the MM5451YN range
Package variants: Multiple package options (28-SSOP, 36-SSOP, 40-TQFN) accommodate different board layout requirements

The MAX6956 base product number variants differ in packaging format and tape/reel configurations, not in core electrical functionality.

Parameter Comparison

Parameter	MM5451YN	MAX6956AAI+	MAX6956AAI+T	MAX6956AAX+	MAX6956AAX+T	MAX6956ATL+
Manufacturer	Microchip Technology	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Display Type	LED	LED	LED	LED	LED	LED
Current - Supply	10 mA	180 µA	180 µA	180 µA	180 µA	180 µA
Voltage - Supply	4.75V ~ 11V	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	40-DIP (0.600", 15.24mm)	28-SSOP (0.209", 5.30mm Width)	28-SSOP (0.209", 5.30mm Width)	36-BSOP (0.295", 7.50mm Width)	36-BSOP (0.295", 7.50mm Width)	40-WFQFN Exposed Pad
Product Status	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All substitute parts maintain active product status and full compliance with ROHS3 and REACH regulations, ensuring regulatory continuity with the MM5451YN. The MAX6956 family provides equivalent LED driver functionality across multiple package formats.

Selection between substitute variants depends on board design constraints:

MAX6956AAI+ and MAX6956AAI+T: 28-pin SSOP package for space-constrained applications with tube or cut tape packaging options
MAX6956AAX+ and MAX6956AAX+T: 36-pin SSOP package offering intermediate pin count with tube or tape & reel packaging
MAX6956ATL+: 40-pin TQFN package with exposed pad, matching the pin count of the original MM5451YN in a surface-mount format

All variants operate within the -40°C to 125°C temperature range, exceeding the MM5451YN specification. Supply voltage range of 2.5V to 5.5V covers the upper operating range of the MM5451YN. Current consumption is significantly lower at 180 µA compared to the 10 mA specification of the original part.

Frequently Asked Questions (FAQ)

Q: Can MAX6956 variants directly replace MM5451YN in existing through-hole designs?

A: Direct board-level replacement is not possible due to mounting type differences. MM5451YN uses through-hole DIP mounting while all MAX6956 variants are surface-mount components. Board redesign or adapter solutions are required for physical integration.

Q: What is the primary functional difference between MM5451YN and MAX6956 substitutes?

A: The MM5451YN uses serial interface control, while MAX6956 variants use I2C interface. Both provide digital control of LED driver functions. Application firmware must be adapted to accommodate the I2C protocol.

Q: Are all MAX6956 variants electrically equivalent?

A: All MAX6956 variants (AAI+, AAI+T, AAX+, AAX+T, ATL+) share identical electrical specifications. Differences are limited to package format and tape/reel configurations. Selection is based on board layout requirements and supply chain preferences.

Q: What is the significance of the +T suffix in part numbers?

A: The +T suffix indicates tape & reel or cut tape packaging format, as opposed to tube packaging. This affects supply chain logistics and automated assembly compatibility, not electrical performance.

Q: How do supply voltage ranges compare between MM5451YN and MAX6956?

A: MM5451YN operates at 4.75V to 11V, while MAX6956 operates at 2.5V to 5.5V. The MAX6956 range overlaps with the upper portion of the MM5451YN range. System voltage must fall within 2.5V to 5.5V for MAX6956 compatibility.

Q: What is the impact of lower supply current in MAX6956 variants?

A: MAX6956 draws 180 µA compared to MM5451YN's 10 mA, representing significantly reduced power consumption. This is a functional advantage in power-sensitive applications and does not indicate reduced capability.

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