PCF8579HT/1 Equivalent & Substitute Parts

Part Overview

The PCF8579HT/1 is a 64-pin TQFP LCD driver manufactured by NXP USA Inc., designed for dot matrix display applications. This component operates across a 2.5V to 6V supply range with minimal current draw of 9 µA, making it suitable for low-power LCD control systems. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and component procurement.

Substiute Parts

PCF8579HT/1

NXP USA Inc.In Stock: 10386PCF8579HT/1 Datasheet

Current PartRFQ

PCF8531U/2DA/1,026

NXP USA Inc.In Stock: 1067PCF8531U/2DA/1,026 Datasheet

MFR RecommendedRFQ

LC75812PTH-8565-H

onsemiIn Stock: 1193LC75812PTH-8565-H Datasheet

MFR RecommendedRFQ

LC75812PTS-8565-H

onsemiIn Stock: 1734LC75812PTS-8565-H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCF8579HT/1 is determined by the following critical parameters:

Display Configuration: Dot matrix LCD driver capability is the primary functional requirement. All substitute parts must support dot matrix display control.

Interface Protocol: The PCF8579HT/1 uses I2C communication. Substitute parts must maintain I2C interface compatibility to ensure seamless integration with existing control circuitry.

Electrical Specifications: Operating voltage range (2.5V ~ 6V) and supply current (9 µA) define the power delivery requirements. Substitute parts must operate within compatible voltage ranges and maintain similar or lower current consumption profiles.

Package and Mounting: The 64-TQFP (10x10) surface mount package defines PCB layout constraints. Substitute parts with different package geometries require board redesign.

Environmental Compliance: RoHS3 compliance and MSL rating ensure regulatory conformance and manufacturing process compatibility.

The identified substitute parts are grouped based on functional equivalence in dot matrix LCD driver capability, with variations in package form factor, interface protocol, and electrical characteristics noted below.

Parameter Comparison

Engineering Selection Recommendations

PCF8531U/2DA/1,026 (NXP USA Inc.)

This part is the preferred substitute from an active product status perspective. It maintains I2C interface compatibility and supports dot matrix configuration alongside 7-segment and 14-segment display modes. The voltage range (1.8V ~ 5.5V) overlaps with the PCF8579HT/1 operating window. However, the die package form factor requires custom integration and differs fundamentally from the 64-TQFP pinout, necessitating circuit redesign. Supply current of 90 µA represents a tenfold increase over the original part. This option is suitable for applications where active product status and NXP ecosystem continuity are prioritized over package compatibility.

LC75812PTH-8565-H and LC75812PTS-8565-H (onsemi)

Both onsemi parts provide dot matrix LCD driver functionality in 100-TQFP (14x14) packages. These parts operate on serial interface protocol rather than I2C, requiring firmware and control circuit modifications. The voltage range (2.7V ~ 3.6V) is narrower than the PCF8579HT/1 and does not extend to the full 2.5V minimum. Supply current of 500 µA significantly exceeds the original specification. Both parts are classified as obsolete. The larger 100-TQFP package requires PCB layout changes. These options are applicable only when serial interface compatibility can be accommodated and higher current consumption is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the PCF8531U/2DA/1,026 be used as a direct replacement for the PCF8579HT/1?

A: The PCF8531U/2DA/1,026 maintains I2C interface compatibility and dot matrix display support, but the die package form factor is incompatible with the 64-TQFP pinout. Direct PCB substitution is not possible without circuit redesign.

Q: What is the primary difference between the onsemi LC75812 variants and the NXP PCF8579HT/1?

A: The LC75812 series uses serial interface protocol instead of I2C, operates at higher supply current (500 µA vs. 9 µA), and requires a larger 100-TQFP package. These differences necessitate control circuit and firmware modifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The PCF8579HT/1 and all identified substitute parts are ROHS3 compliant, ensuring regulatory conformance for new designs.

Q: Does the PCF8531U/2DA/1,026 support the same voltage range as the PCF8579HT/1?

A: The PCF8531U/2DA/1,026 operates across 1.8V ~ 5.5V, which overlaps with the PCF8579HT/1 range of 2.5V ~ 6V. The PCF8531 extends lower to 1.8V but does not reach the 6V upper limit of the original part.

Q: Why do the onsemi LC75812 parts consume significantly more current?

A: The LC75812 series is specified at 500 µA supply current, compared to 9 µA for the PCF8579HT/1. This difference reflects different internal architecture and feature sets between the NXP and onsemi product lines.

Q: Can I use an LC75812 part if my application requires I2C interface?

A: No. The LC75812 series implements serial interface protocol. Substitution requires firmware modification and control circuit redesign to accommodate serial communication instead of I2C.