TC835CKW Equivalent & Substitute Parts

Part Overview

The TC835CKW is a 7-segment, 4.5-digit LED driver IC manufactured by Microchip Technology in a 44-MQFP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The TC835CKW operates within a 4V to 6V supply voltage range and is designed for applications requiring multi-digit display driving capabilities.

Substiute Parts

TC835CKW

Microchip TechnologyIn Stock: 981TC835CKW Datasheet

Current PartRFQ

CD74HC4543E

Texas InstrumentsIn Stock: 1766CD74HC4543E Datasheet

MFR RecommendedRFQ

CD74HCT4543E

Harris CorporationIn Stock: 28866CD74HCT4543E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TC835CKW is based on functional equivalence in 7-segment LED driver capability and electrical parameter compatibility. The primary substitutes identified are the CD74HC4543E and CD74HCT4543E, both of which provide 7-segment decoder/driver functionality with BCD interface support.

Key parameters determining substitution validity:

• 7-segment display driver functionality
• BCD input interface compatibility
• Supply voltage overlap (minimum 4V operation)
• Operating temperature range coverage
• RoHS and REACH compliance status
• Package compatibility considerations

Parameter Comparison

Engineering Selection Recommendations

The CD74HC4543E is the primary substitute for the TC835CKW based on the following criteria:

• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliance aligns with the original part's regulatory standing
• Supply voltage range of 2V to 6V encompasses the TC835CKW operating window of 4V to 6V
• Extended operating temperature range (-55°C to 125°C) exceeds the original specification
• REACH Unaffected status maintains regulatory compatibility

The CD74HCT4543E is a secondary option with the following considerations:

• Obsolete product status limits future availability
• RoHS non-compliance creates regulatory constraints for new designs
• Supply voltage range of 4.5V to 5.5V is narrower than the TC835CKW specification
• Extended operating temperature range provides broader environmental coverage

Both substitutes operate as single-digit 7-segment drivers, requiring circuit redesign if multi-digit functionality is essential to the application.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC4543E directly replace the TC835CKW in existing PCB layouts?

A: No. The TC835CKW uses a 44-QFP surface mount package, while the CD74HC4543E uses a 16-DIP through-hole package. PCB redesign is required for physical integration.

Q: What is the functional difference between the TC835CKW and CD74HC4543E?

A: The TC835CKW is a 4.5-digit 7-segment driver, while the CD74HC4543E is a single-digit 7-segment decoder/driver. Both use BCD input interface, but the TC835CKW integrates multi-digit display capability in a single package.

Q: Is the CD74HCT4543E suitable for new designs?

A: The CD74HCT4543E is obsolete and RoHS non-compliant. For new designs, the CD74HC4543E is the recommended choice due to active status and ROHS3 compliance.

Q: What supply voltage range is safe for both substitutes?

A: The overlapping safe operating range is 4.5V to 5.5V, which accommodates both the CD74HC4543E (2V to 6V) and CD74HCT4543E (4.5V to 5.5V) while remaining within the TC835CKW specification of 4V to 6V.

Q: Are there any compliance concerns when switching from TC835CKW to CD74HC4543E?

A: No compliance concerns exist. Both parts are ROHS3 compliant and REACH Unaffected, maintaining regulatory alignment for industrial and commercial applications.