PCF1178CT,118 Equivalent & Substitute Parts

Part Overview

The PCF1178CT,118 is a 7-segment LCD driver IC manufactured by NXP Semiconductors, designed to control 4-digit LCD displays. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The part operates on a low-power supply voltage range of 3V to 6V with a supply current of 950 µA, suitable for battery-powered and portable applications requiring LCD display control.

Substiute Parts

PCF1178CT,118

NXP SemiconductorsIn Stock: 952PCF1178CT,118 Datasheet

Current PartRFQ

TC7126ACKW

Microchip TechnologyIn Stock: 1093TC7126ACKW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCF1178CT,118 is determined by the following critical parameters:

• Display Driver Function: Both the main part and substitute must support 7-segment LCD display driving capability
• Supply Voltage Compatibility: The substitute must operate within or encompass the 3V to 6V supply range
• Operating Temperature Range: The substitute must support the required thermal operating window
• Package Type: Surface mount packaging is required for PCB integration compatibility
• RoHS and Compliance Status: Both parts must maintain ROHS3 compliance and REACH unaffected status

The TC7126ACKW from Microchip Technology is identified as a substitute part. However, critical parameter differences exist that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The TC7126ACKW is an active product from Microchip Technology and maintains ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the PCF1178CT,118. However, the following parameter deviations must be evaluated:

• Supply Voltage: The TC7126ACKW operates at 9V, which differs from the PCF1178CT,118 range of 3V to 6V. Circuit redesign may be required to accommodate this higher voltage requirement.
• Digit Count: The TC7126ACKW supports 3 1/2 digits versus 4 digits on the main part. Application requirements must accommodate this reduced display capacity.
• Operating Temperature Range: The TC7126ACKW operates from 0°C to 70°C, which is narrower than the -40°C to 85°C range of the main part. Applications requiring extended temperature operation must verify compatibility.
• Package Footprint: The TC7126ACKW uses a 44-QFP package versus the 28-SOIC package of the main part. PCB layout redesign is required.
• Moisture Sensitivity: The TC7126ACKW has MSL 3 (168 Hours) versus MSL 1 (Unlimited) for the main part, requiring stricter moisture control during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can the TC7126ACKW directly replace the PCF1178CT,118 without circuit modifications?

A: No. The TC7126ACKW requires circuit redesign due to different supply voltage (9V vs. 3V-6V), different digit capacity (3 1/2 vs. 4 digits), and different package footprint (44-QFP vs. 28-SOIC).

Q: What are the key compatibility criteria for 7-segment LCD driver substitution?

A: Supply voltage range, digit count, operating temperature range, package type, and display interface specifications must align with application requirements. Regulatory compliance (RoHS, REACH) must be maintained.

Q: Is the TC7126ACKW suitable for low-power battery applications?

A: The TC7126ACKW operates at 9V supply voltage, which may not be optimal for low-power battery applications designed for the 3V-6V range of the PCF1178CT,118. Supply current specifications for the TC7126ACKW are not provided for direct comparison.

Q: What is the impact of the different package types?

A: The PCF1178CT,118 uses 28-SOIC packaging while the TC7126ACKW uses 44-QFP packaging. This requires complete PCB layout redesign, including trace routing, component placement, and thermal management considerations.

Q: Are there temperature range limitations with the TC7126ACKW?

A: Yes. The TC7126ACKW operates from 0°C to 70°C, which is narrower than the PCF1178CT,118 range of -40°C to 85°C. Applications requiring extended temperature operation must verify that the TC7126ACKW meets thermal requirements.

Q: What does MSL 3 (168 Hours) mean for the TC7126ACKW?

A: MSL 3 indicates the component can be exposed to moisture for a maximum of 168 hours before soldering. This requires stricter moisture control during storage and handling compared to the PCF1178CT,118 MSL 1 (Unlimited).