CDC339DBG4 Clock Fanout Buffer - Equivalent & Substitute Parts

Part Overview

The CDC339DBG4 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, operating within a 4.75V to 5.25V supply voltage range, and is housed in a 20-SSOP surface mount package.

The CDC339DBG4 has been discontinued at DiGi Electronics. Identifying functionally equivalent substitute parts is necessary to maintain design continuity and ensure project timelines are not disrupted due to component unavailability.

Substiute Parts

CDC339DBG4

Texas InstrumentsIn Stock: 877CDC339DBG4 Datasheet

Current PartRFQ

CDC339DB

Texas InstrumentsIn Stock: 1502CDC339DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDC339DBG4 is determined by strict equivalence across the following critical parameters:

• Fanout Configuration: 1:8 input-to-output ratio
• Logic Levels: TTL input and TTL output (no differential signaling)
• Maximum Frequency: 80 MHz minimum capability
• Supply Voltage Range: 4.75V ~ 5.25V
• Package Type: 20-SSOP surface mount form factor
• Temperature Range: -40°C ~ 85°C operating window
• Compliance: ROHS3 and REACH requirements

The CDC339DB qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The CDC339DB is a direct functional equivalent to the CDC339DBG4. Both parts share identical electrical characteristics, thermal specifications, and compliance certifications (ROHS3, REACH Unaffected). The CDC339DB maintains active product status, ensuring ongoing availability and supply chain reliability.

The CDC339DB is supplied in Tube packaging, whereas the CDC339DBG4 was supplied in Tape and Reel format. This packaging difference does not affect electrical performance or PCB assembly compatibility for surface mount applications.

Selection of the CDC339DB is appropriate for new designs, redesigns, or production continuity where the CDC339DBG4 is no longer available.

Frequently Asked Questions (FAQ)

Q: Can the CDC339DB be used as a direct replacement for the CDC339DBG4 in existing designs?

A: Yes. Both parts are electrically identical across all specified parameters: 1:8 fanout ratio, 80 MHz maximum frequency, TTL logic levels, 4.75V to 5.25V supply voltage, and 20-SSOP package configuration. No circuit modifications are required.

Q: What is the difference between the CDC339DBG4 and CDC339DB?

A: The primary differences are product status and packaging format. The CDC339DBG4 is discontinued and was supplied in Tape and Reel format. The CDC339DB is an active product supplied in Tube packaging. Electrical and thermal specifications are identical.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts carry identical ROHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited) ratings.

Q: Does the Tube packaging of the CDC339DB affect PCB assembly?

A: No. Tube packaging is compatible with standard surface mount assembly processes. The 20-SSOP package dimensions and pin configuration remain unchanged.

Q: What is the base product number for these parts?

A: The base product number is CDC339. Both the CDC339DBG4 and CDC339DB are variants of this base product line.