PCA8551ATT/AJ Equivalent & Substitute Parts

Part Overview

The PCA8551ATT/AJ is an LCD driver IC manufactured by NXP USA Inc., designed for 144-segment display applications in automotive-grade environments. This device operates as a Power Management IC (PMIC) with I2C interface support, enabling control of up to 144 display elements across 9 or 18 character configurations.

The PCA8551ATT/AJ carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this LCD driver architecture.

Substiute Parts

PCA8551ATT/AJ

NXP USA Inc.In Stock: 1113PCA8551ATT/AJ Datasheet

Current PartRFQ

PCA8551ATT/AY

NXP USA Inc.In Stock: 1102PCA8551ATT/AY Datasheet

DirectRFQ

BU9797FUV-E2

ROHM SemiconductorIn Stock: 859BU9797FUV-E2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA8551ATT/AJ are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Display Type: LCD
• Package / Case: 48-TFSOP form factor (0.240", 6.10mm Width)
• Mounting Type: Surface Mount
• Voltage Supply Range: Overlap within 1.8V ~ 5.5V
• Operating Temperature Range: Support for automotive temperature extremes (-40°C minimum)
• Grade: Automotive qualification
• Qualification: AEC-Q100 certification

Substitution Categories:

1. Direct Manufacturer Equivalent (PCA8551ATT/AY): Same base product number (PCA8551) from NXP USA Inc., identical package and mounting specifications, matching voltage and temperature ranges, Active product status. Configuration difference (36 Segment vs. 144 Segment) represents a design variant within the same product family.

2. Cross-Manufacturer Alternative (BU9797FUV-E2): ROHM Semiconductor LCD driver with 144-segment configuration matching the original part's display capacity. Maintains 48-TSSOP package compatibility and automotive-grade qualification. Interface differs (3-Wire Serial vs. I2C) and operating temperature maximum is reduced to 85°C.

Parameter Comparison

Engineering Selection Recommendations

PCA8551ATT/AY (Direct Equivalent): This part is the preferred substitute for the PCA8551ATT/AJ. Both parts share identical electrical specifications, package dimensions, and automotive qualifications (AEC-Q100). The PCA8551ATT/AY maintains Active product status, ensuring long-term availability and supply chain stability. The configuration difference (36 Segment vs. 144 Segment) must be evaluated against specific application requirements; however, both variants operate within the same electrical and thermal envelope. This part is suitable for direct replacement in designs where the 36-segment configuration meets functional requirements.

BU9797FUV-E2 (Cross-Manufacturer Alternative): This ROHM Semiconductor part provides a 144-segment configuration matching the original PCA8551ATT/AJ display capacity. The 48-TSSOP-CV package maintains physical compatibility with the original 48-TFSOP footprint. However, three critical differences require design evaluation:

1. Interface Protocol: 3-Wire Serial communication differs from the I2C interface of the original part, requiring firmware or controller modifications.
2. Operating Temperature Maximum: 85°C upper limit is lower than the original 105°C specification, restricting use in high-temperature automotive environments.
3. Current Supply: 7.5 µA exceeds the original 1.8 µA specification, affecting power budget calculations.

The BU9797FUV-E2 is suitable only when application requirements accommodate these parameter differences and when design modifications to support 3-Wire Serial communication are feasible.

Frequently Asked Questions (FAQ)

Q: Can PCA8551ATT/AY be used as a direct drop-in replacement for PCA8551ATT/AJ?

A: PCA8551ATT/AY shares identical electrical specifications, package footprint, and automotive qualifications with PCA8551ATT/AJ. Physical and electrical compatibility is confirmed. The 36-segment configuration of the PCA8551ATT/AY must be evaluated against application display requirements; if the design requires 144-segment capability, this part is not suitable.

Q: What are the key differences between PCA8551ATT/AJ and BU9797FUV-E2?

A: Both parts support 144-segment LCD display configurations and maintain 48-pin surface-mount packages. Critical differences include: (1) Communication interface—PCA8551ATT/AJ uses I2C while BU9797FUV-E2 uses 3-Wire Serial, requiring controller firmware changes; (2) Operating temperature maximum—PCA8551ATT/AJ supports 105°C while BU9797FUV-E2 is limited to 85°C; (3) Supply current—PCA8551ATT/AJ draws 1.8 µA versus 7.5 µA for BU9797FUV-E2.

Q: Are all substitute parts automotive-qualified?

A: PCA8551ATT/AJ and PCA8551ATT/AY both carry AEC-Q100 qualification and Automotive grade designation. BU9797FUV-E2 does not specify automotive grade or AEC-Q100 qualification in the provided data. Verification of automotive compliance for BU9797FUV-E2 is required before use in automotive applications.

Q: What is the impact of the voltage supply range difference between PCA8551ATT/AJ and BU9797FUV-E2?

A: PCA8551ATT/AJ operates from 1.8V to 5.5V, while BU9797FUV-E2 operates from 2.5V to 5.5V. The BU9797FUV-E2 cannot operate below 2.5V. If the application requires operation at voltages below 2.5V, BU9797FUV-E2 is not suitable.

Q: Does package compatibility guarantee functional interchangeability?

A: No. While PCA8551ATT/AJ and BU9797FUV-E2 both use 48-pin surface-mount packages with identical physical dimensions, functional interchangeability depends on matching electrical specifications, communication protocols, and operating ranges. The 3-Wire Serial interface of BU9797FUV-E2 differs from the I2C interface of PCA8551ATT/AJ, requiring design modifications beyond physical substitution.

Q: What is the significance of the Obsolete product status for PCA8551ATT/AJ?

A: Obsolete status indicates that NXP USA Inc. has discontinued manufacturing and support for this part. Current inventory availability may be limited to existing stock. PCA8551ATT/AY (Active status) is recommended for new designs and ongoing production to ensure long-term supply chain continuity.