PCF8551ATT/AJ LCD Driver IC Equivalent & Substitute Parts

Part Overview

The PCF8551ATT/AJ is a 48-TSSOP surface mount LCD driver IC manufactured by NXP Semiconductors, designed for multi-segment display applications. This component supports 7-segment, 14-segment, and dot matrix display configurations with I2C interface control. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

PCF8551ATT/AJ

NXP SemiconductorsIn Stock: 2251PCF8551ATT/AJ Datasheet

Current PartRFQ

PCF8551ATT/AY

NXP USA Inc.In Stock: 38399PCF8551ATT/AY Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCF8551ATT/AJ is determined by strict alignment of the following critical parameters:

• Base Product Number: Both parts must share the PCF8551 base designation, ensuring core functional compatibility
• Package / Case: Identical 48-TFSOP (0.240", 6.10mm Width) package required for PCB footprint compatibility
• Interface Protocol: I2C interface must be maintained for system-level communication compatibility
• Supply Voltage Range: 1.8V ~ 5.5V operating range must be supported
• Supply Current: 1.2 µA specification must be met
• Operating Temperature Range: -40°C ~ 85°C minimum requirement
• Display Type: LCD driver functionality must be preserved
• RoHS and Environmental Compliance: ROHS3 compliance and MSL 3 rating must be maintained

The PCF8551ATT/AY qualifies as a direct substitute based on full alignment with all critical parameters listed above.

Parameter Comparison

Engineering Selection Recommendations

The PCF8551ATT/AY is a qualified direct substitute for the obsolete PCF8551ATT/AJ. Both components share identical electrical specifications, package geometry, and interface protocols. The substitute part offers the advantage of active product status, ensuring continued availability and manufacturing support.

The PCF8551ATT/AY carries AEC-Q100 automotive qualification and automotive-grade designation, providing additional reliability assurance for applications requiring automotive-level component standards. This qualification does not restrict use in non-automotive applications and represents an enhancement over the original part specification.

All regulatory compliance parameters—RoHS3, REACH, ECCN, and HTSUS classifications—are identical between the main part and substitute, ensuring no supply chain or regulatory documentation changes are required during component transition.

Frequently Asked Questions (FAQ)

Q: Can PCF8551ATT/AY be used as a direct replacement for PCF8551ATT/AJ in existing designs?

A: Yes. Both parts share identical electrical specifications, package dimensions, and I2C interface protocols. No circuit modifications or PCB redesign is required for substitution.

Q: What is the significance of the AEC-Q100 qualification on the PCF8551ATT/AY?

A: AEC-Q100 qualification indicates the component meets automotive industry reliability and quality standards. This certification does not restrict the part to automotive applications and represents enhanced quality assurance applicable to any end-use.

Q: Are there differences in display configuration support between these parts?

A: The main part supports 7-segment + DP, 14-segment + DP + AP, and dot matrix configurations. The substitute part specifies 36-segment configuration. Both parts support 9 characters, 18 characters, and 144 elements through I2C control, maintaining functional compatibility.

Q: Why is the original PCF8551ATT/AJ classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The PCF8551ATT/AY, with active product status, represents the current manufacturing equivalent and recommended source for new procurement.

Q: Are packaging and moisture sensitivity specifications identical?

A: Yes. Both parts use 48-TFSOP package with 0.240" (6.10mm) width and carry MSL 3 (168 hours) rating. Storage and handling requirements are identical.

Q: What supply voltage range is supported by both parts?

A: Both the PCF8551ATT/AJ and PCF8551ATT/AY operate across 1.8V to 5.5V supply voltage range, supporting single-supply and multi-supply system architectures.