PCF8579T/1,112 Equivalent & Substitute Parts

Part Overview

The PCF8579T/1,112 is an LCD dot matrix driver IC manufactured by NXP USA Inc., designed for driving dot matrix display configurations via I2C interface. This component operates within a 2.5V to 6V supply voltage range with minimal current consumption of 9 µA, making it suitable for low-power LCD applications. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and component procurement.

Substiute Parts

PCF8579T/1,112

NXP USA Inc.In Stock: 1017PCF8579T/1,112 Datasheet

Current PartRFQ

PCF8579HT/1

NXP USA Inc.In Stock: 10386PCF8579HT/1 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 PCF8579T/1,112 is determined by the following critical parameters:

Interface Compatibility: The primary substitution criterion is interface type. The main part operates via I2C protocol. Substitute parts must maintain I2C interface compatibility to ensure direct integration without firmware or hardware modifications.

Display Configuration: All qualified substitutes must support dot matrix LCD display configuration, matching the functional purpose of the original component.

Electrical Specifications: Supply voltage range, operating current, and temperature range must be compatible with the original design envelope. The main part operates at 2.5V to 6V with 9 µA supply current across -40°C to 85°C.

Compliance & Certification: RoHS3 compliance and REACH unaffected status are mandatory for modern procurement and regulatory adherence.

Packaging & Mounting: Surface mount technology is required. Package form factor differences are acceptable provided the substitute maintains electrical and functional equivalence.

Based on these criteria, the PCF8579HT/1 (NXP USA Inc., same base product family, I2C interface) qualifies as a direct substitute. The onsemi LC75812 series (LC75812PTH-8565-H and LC75812PTS-8565-H) represents functional alternatives with serial interface configuration, suitable for applications where interface protocol flexibility exists.

Parameter Comparison

Engineering Selection Recommendations

PCF8579HT/1 (Primary Substitute): This NXP component shares the same base product family (PCF8579) and maintains I2C interface compatibility with the original PCF8579T/1,112. Both components operate within identical voltage and temperature ranges with equivalent supply current specifications. The PCF8579HT/1 is packaged in 64-TQFP format versus the original 56-BSOP, requiring PCB layout modification. Both components are ROHS3 compliant and REACH unaffected. This substitute is recommended for designs where I2C protocol integration is established and PCB redesign is feasible.

LC75812PTH-8565-H and LC75812PTS-8565-H (Functional Alternatives): These onsemi components provide dot matrix LCD driver functionality with serial interface configuration. Both operate at 500 µA supply current (55× higher than the original) and require a narrower voltage range (2.7V to 3.6V versus 2.5V to 6V). These parts are suitable for applications where serial interface protocol can be accommodated and higher current consumption is acceptable. Both are ROHS3 compliant and REACH unaffected. Package format is 100-TQFP (14x14), requiring significant PCB layout changes.

All substitute options maintain obsolete product status and equivalent compliance certifications. Selection depends on interface protocol requirements and PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can PCF8579HT/1 directly replace PCF8579T/1,112 without firmware changes?

A: PCF8579HT/1 maintains I2C interface compatibility and identical electrical specifications (voltage range, supply current, temperature range). Direct replacement is feasible from a functional standpoint. However, package format differs (64-TQFP versus 56-BSOP), requiring PCB layout modification and pin-to-pin verification against schematic documentation.

Q: What are the key differences between NXP and onsemi substitutes?

A: NXP PCF8579HT/1 maintains I2C interface and low-power operation (9 µA). onsemi LC75812 series uses serial interface with significantly higher current consumption (500 µA) and narrower voltage range (2.7V to 3.6V). Interface protocol differences require firmware and hardware modifications for onsemi alternatives.

Q: Are all substitutes RoHS3 compliant?

A: Yes. PCF8579HT/1, LC75812PTH-8565-H, and LC75812PTS-8565-H are all ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

Q: What is the impact of MSL (Moisture Sensitivity Level) differences?

A: The original PCF8579T/1,112 has MSL 1 (unlimited shelf life). Substitutes have MSL 3 (168-hour limit after moisture exposure). This affects storage and handling procedures. Components with MSL 3 require controlled humidity storage and have a 168-hour window for assembly after moisture barrier removal.

Q: Can LC75812 series be used in existing PCF8579 designs?

A: LC75812 series provides functional dot matrix LCD driver capability but requires interface protocol conversion from I2C to serial. This necessitates firmware modifications, additional interface circuitry, and comprehensive system testing. Voltage range differences (2.7V to 3.6V) may also require power supply adjustments.

Q: Which substitute offers the closest electrical match?

A: PCF8579HT/1 provides the closest electrical and functional match, maintaining identical supply voltage range (2.5V to 6V), supply current (9 µA), and I2C interface protocol. Package format is the primary difference requiring PCB redesign.