TC835CPI Equivalent & Substitute Parts

Part Overview

The TC835CPI is a 7-segment, 4.5-digit display driver IC manufactured by Microchip Technology in a 28-pin DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The TC835CPI operates with a supply voltage range of 4V to 6V and is rated for operating temperatures from 0°C to 70°C. Substitute parts must maintain functional compatibility with the original display driver specifications while meeting current component availability and compliance requirements.

Substiute Parts

TC835CPI

Microchip TechnologyIn Stock: 6339TC835CPI Datasheet

Current PartRFQ

CD74HC4543E

Texas InstrumentsIn Stock: 1766CD74HC4543E Datasheet

MFR RecommendedRFQ

CD74HCT4543E

Harris CorporationIn Stock: 28866CD74HCT4543E Datasheet

MFR RecommendedRFQ

ICL7135CPI+

Analog Devices Inc./Maxim IntegratedIn Stock: 2047ICL7135CPI+ Datasheet

MFR RecommendedRFQ

ICL7135CPI+2

Analog Devices Inc./Maxim IntegratedIn Stock: 1233ICL7135CPI+2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TC835CPI are grouped into two functional categories based on allowed electrical and mechanical parameters:

Group 1: Direct Package and Voltage Compatibility (28-DIP Package, 4V–6V Supply)

• ICL7135CPI+
• ICL7135CPI+2

These substitutes maintain the identical 28-DIP package footprint and supply voltage range (4V–6V), ensuring direct pin-compatible replacement in existing PCB designs. Both parts are classified as Data Acquisition display drivers with 4.5-digit resolution, matching the original TC835CPI functional specification.

Group 2: Alternative Package Configuration (16-DIP Package, Modified Voltage Range)

• CD74HC4543E
• CD74HCT4543E

These substitutes operate as 7-segment LED drivers but utilize a 16-DIP package with different supply voltage specifications. CD74HC4543E supports 2V–6V operation, while CD74HCT4543E operates at 4.5V–5.5V. These parts require PCB redesign and are suitable only when package size reduction is acceptable and voltage requirements align.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No PCB Redesign Required): Select ICL7135CPI+ or ICL7135CPI+2 when pin-compatible substitution is required. Both parts maintain the 28-DIP package, 4V–6V supply voltage range, and 0°C–70°C operating temperature specification of the TC835CPI. Both are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability. ICL7135CPI+ and ICL7135CPI+2 are functionally equivalent with identical electrical specifications; selection between them depends on inventory availability and supplier preference.

For Alternative Configurations (PCB Redesign Acceptable): CD74HC4543E is suitable when package size reduction and extended temperature range (-55°C to 125°C) are acceptable trade-offs. This part offers the widest supply voltage tolerance (2V–6V) and maintains ROHS3 compliance with active product status.

CD74HCT4543E is not recommended for new designs due to obsolete product status and RoHS non-compliance, despite maintaining the 4.5V–5.5V voltage specification overlap with the TC835CPI.

Frequently Asked Questions (FAQ)

Q: Can ICL7135CPI+ and ICL7135CPI+2 be used interchangeably with TC835CPI? A: Yes. Both parts are pin-compatible replacements with identical package dimensions (28-DIP), supply voltage range (4V–6V), and operating temperature range (0°C–70°C). No PCB modifications are required.

Q: What is the primary difference between ICL7135CPI+ and ICL7135CPI+2? A: Both parts are functionally identical with matching electrical specifications. The suffix designation reflects manufacturing or packaging variations. Selection should be based on supplier availability and inventory status.

Q: Why do CD74HC4543E and CD74HCT4543E require PCB redesign? A: These substitutes use a 16-DIP package (0.300", 7.62mm) instead of the 28-DIP package (0.600", 15.24mm) of the TC835CPI. Pin count and pinout differ, requiring circuit board layout modifications.

Q: Is CD74HC4543E suitable for applications requiring the full 0°C–70°C temperature range? A: CD74HC4543E operates across -55°C to 125°C, which exceeds the TC835CPI specification. It is suitable for applications within the 0°C–70°C range and provides additional margin for extended temperature environments.

Q: What compliance certifications should be verified for new production? A: All recommended substitutes (ICL7135CPI+, ICL7135CPI+2, and CD74HC4543E) are ROHS3 compliant and REACH unaffected. CD74HCT4543E is RoHS non-compliant and should not be used in applications requiring RoHS certification.

Q: Are moisture sensitivity considerations important for these substitutes? A: ICL7135CPI+ and ICL7135CPI+2 carry MSL 1 (Unlimited), matching the TC835CPI specification. CD74HC4543E and CD74HCT4543E are not applicable for MSL classification. For applications with strict moisture control requirements, ICL7135 variants are preferred.