Renesas Electronics 2308-4DCGI Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 2308-4DCGI is a Multiplier, Zero Delay Buffer IC designed for clock and timing applications. This device operates at a maximum frequency of 133.3MHz with a 1:8 input-to-output ratio, featuring LVTTL signal compatibility and integrated PLL with bypass capability. The product is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring similar timing multiplication and zero delay buffering functionality.

Substiute Parts

2308-4DCGI

Renesas Electronics CorporationIn Stock: 9532308-4DCGI Datasheet

Current PartRFQ

8T49N240-998NLGI

Renesas Electronics CorporationIn Stock: 13158T49N240-998NLGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2308-4DCGI requires evaluation against the following critical parameters that define functional equivalence in clock and timing applications:

Primary Substitution Criteria:

• Frequency capability (maximum operating frequency must meet or exceed 133.3MHz)
• Multiplication/division ratio support (1:8 ratio or equivalent frequency scaling)
• PLL architecture with bypass functionality
• Input and output signal compatibility (LVTTL or compatible logic families)
• Supply voltage range overlap (3V ~ 3.6V operation)
• Operating temperature range (-40°C ~ 85°C)
• Surface mount packaging suitable for PCB integration
• RoHS3 compliance and MSL rating for manufacturing compatibility

The Renesas Electronics 8T49N240-998NLGI is identified as a manufacturer-recommended substitute. While this device operates in a different functional category (Jitter Attenuator versus Multiplier/Zero Delay Buffer) and features enhanced specifications including higher maximum frequency (867MHz), broader input/output signal compatibility, and advanced jitter attenuation capabilities, it satisfies the core requirement of providing clock multiplication and signal conditioning functionality within the specified voltage and temperature operating ranges.

Parameter Comparison

Engineering Selection Recommendations

Selection of the 8T49N240-998NLGI as a substitute for the obsolete 2308-4DCGI is supported by the following engineering factors:

Product Status and Availability: The 2308-4DCGI is classified as Obsolete, creating supply chain risk and limiting long-term availability. The 8T49N240-998NLGI maintains Active product status with documented inventory availability, ensuring sustained component supply for production and field support.

Regulatory and Compliance Alignment: Both devices maintain ROHS3 compliance and identical MSL ratings (3, 168 Hours), ensuring compatibility with current manufacturing processes and environmental standards. Both devices carry EAR99 ECCN classification and are REACH Unaffected, maintaining consistent regulatory posture.

Functional Capability: The 8T49N240-998NLGI provides enhanced frequency capability (867MHz maximum versus 133.3MHz) and expanded input/output signal compatibility, supporting LVCMOS, LVDS, LVHSTL, and LVPECL in addition to LVTTL. This broader signal support accommodates diverse clock distribution architectures while maintaining backward compatibility with LVTTL-based systems through output format selection.

Operating Parameters: Both devices operate within the -40°C to 85°C temperature range. The substitute device supply voltage range (1.71V ~ 3.465V) encompasses the original device specification (3V ~ 3.6V), ensuring voltage compatibility in existing designs.

Physical Integration Considerations: The substitute device employs a 40-VFQFN package (6x6mm) compared to the original 16-SOIC package. This represents a change in physical footprint and pin count, requiring PCB layout modification and schematic redesign. The exposed pad thermal design of the VFQFN package provides improved thermal performance suitable for higher frequency operation.

Frequently Asked Questions (FAQ)

Q: Can the 8T49N240-998NLGI directly replace the 2308-4DCGI without PCB modification?

A: No. The devices employ different package types (16-SOIC versus 40-VFQFN) and pin configurations. PCB layout redesign and schematic modification are required. Pin-to-pin compatibility does not exist between these devices.

Q: What is the primary reason for substitution?

A: The 2308-4DCGI is classified as Obsolete. The 8T49N240-998NLGI is an Active product from the same manufacturer, providing equivalent clock multiplication and signal conditioning functionality with enhanced specifications and sustained availability.

Q: Are the operating temperature ranges compatible?

A: Yes. Both devices operate across the -40°C to 85°C temperature range, ensuring thermal compatibility in equivalent applications.

Q: Does the substitute device support LVTTL signal levels?

A: The 8T49N240-998NLGI supports LVCMOS and LVPECL output formats, which are compatible with LVTTL input thresholds. LVTTL output format is not explicitly listed; however, LVCMOS output provides equivalent logic level compatibility for LVTTL-based receiver circuits.

Q: What is the impact of the higher maximum frequency specification?

A: The 867MHz maximum frequency of the 8T49N240-998NLGI exceeds the 133.3MHz requirement of the original application. This provides frequency headroom for future design evolution and supports higher-speed clock distribution architectures. The device operates at lower frequencies without performance degradation.

Q: Are moisture sensitivity levels equivalent?

A: Yes. Both devices carry MSL rating 3 (168 Hours), ensuring identical handling, storage, and manufacturing process requirements.

Q: What supply voltage considerations apply?

A: The substitute device operates across 1.71V ~ 3.465V, which encompasses the original specification of 3V ~ 3.6V. Designs operating at 3V ~ 3.6V remain within the substitute device operating range without modification.

Q: Are regulatory certifications maintained?

A: Yes. Both devices maintain ROHS3 compliance, EAR99 ECCN classification, and REACH Unaffected status, ensuring equivalent regulatory posture for manufacturing and export.