CDC340DWR Clock Fanout Buffer - Equivalent & Substitute Parts

Part Overview

The CDC340DWR is a Clock Fanout Buffer (Distribution) IC manufactured by Texas Instruments, designed for 1:8 clock distribution at frequencies up to 80 MHz. This component features TTL-level input and output, operates on a 4.75V to 5.25V supply, and is housed in a 20-SOIC surface mount package.

The CDC340DWR is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this clock distribution function.

Substiute Parts

CDC340DWR

Texas InstrumentsIn Stock: 874CDC340DWR Datasheet

Current PartRFQ

CDC341DWR

Texas InstrumentsIn Stock: 16160CDC341DWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDC340DWR is determined by strict equivalence across the following electrical and mechanical parameters:

• Fanout Configuration: 1:8 ratio (one input, eight outputs)
• Logic Levels: TTL input and TTL output
• Maximum Frequency: 80 MHz operation capability
• Supply Voltage Range: 4.75V to 5.25V
• Package Type: 20-SOIC surface mount form factor
• Pin Compatibility: Identical pinout and package dimensions

The CDC341DWR meets all these criteria and qualifies as a parametric equivalent. Both parts share identical electrical specifications, package geometry, and functional performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The CDC341DWR is the direct parametric equivalent for the CDC340DWR. Both components are manufactured by Texas Instruments and share identical electrical and mechanical specifications across all critical parameters: 1:8 fanout ratio, TTL logic levels, 80 MHz maximum frequency, 4.75V to 5.25V supply voltage, and 20-SOIC package.

The primary distinction is product status: the CDC340DWR is obsolete, while the CDC341DWR is active. The CDC341DWR is available in significantly higher inventory (16,063 pieces versus 785 pieces), ensuring supply chain continuity and long-term availability.

Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings, confirming full compatibility for manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can the CDC341DWR directly replace the CDC340DWR in existing designs?

A: Yes. The CDC341DWR is a parametric equivalent with identical electrical specifications, logic levels, frequency rating, supply voltage range, and 20-SOIC package dimensions. Direct substitution is supported without design modification.

Q: Are there any differences in pin configuration between these parts?

A: No. Both the CDC340DWR and CDC341DWR use the same 20-SOIC package with identical pinout. PCB layout and component placement require no changes.

Q: What is the significance of the product status difference?

A: The CDC340DWR is classified as obsolete, indicating Texas Instruments no longer manufactures this part. The CDC341DWR is active production, ensuring ongoing availability and support. For new designs or long-term production requirements, the CDC341DWR is the recommended selection.

Q: Do both parts meet the same compliance and environmental standards?

A: Yes. Both the CDC340DWR and CDC341DWR are ROHS3 compliant, carry MSL rating 1 (Unlimited), and are REACH unaffected. Environmental and regulatory requirements are identical.

Q: What is the maximum clock frequency supported by these fanout buffers?

A: Both parts support a maximum frequency of 80 MHz for clock distribution applications.

Q: Are these parts suitable for TTL-level systems?

A: Yes. Both the CDC340DWR and CDC341DWR feature TTL-level input and output, making them compatible with TTL logic systems operating at 4.75V to 5.25V supply voltage.