IDT2308B-1DC Equivalent & Substitute Parts

Part Overview

The IDT2308B-1DC is a Multiplier, Zero Delay Buffer IC manufactured by Renesas Electronics Corporation, designed for clock/timing applications with a maximum frequency of 133.3MHz. This component operates with LVTTL input and output levels, supports a 1:8 input-to-output ratio, and is housed in a 16-SOIC surface mount package. The product is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing system support.

Substiute Parts

IDT2308B-1DC

Renesas Electronics CorporationIn Stock: 1193IDT2308B-1DC Datasheet

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CDCVF25081D

Texas InstrumentsIn Stock: 1190CDCVF25081D Datasheet

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CDCVF25081DR

Texas InstrumentsIn Stock: 6366CDCVF25081DR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IDT2308B-1DC are qualified based on the following critical parameters that determine functional compatibility:

Mechanical Compatibility: Package type (16-SOIC), physical dimensions (0.154", 3.90mm Width), and surface mount mounting type must match exactly to ensure PCB layout compatibility without redesign.

Electrical Compatibility: Supply voltage range (3V ~ 3.6V), input/output signal levels (LVTTL), and number of circuits (1) must be identical. The input-to-output ratio and PLL with bypass functionality are core functional requirements.

Frequency Performance: Substitute parts must support the maximum frequency requirement of 133.3MHz or higher to ensure operational capability in the target application.

The substitute parts identified—CDCVF25081D and CDCVF25081DR—meet all mechanical and electrical compatibility criteria. Both are PLL Clock Driver ICs from Texas Instruments with identical package specifications, supply voltage ranges, signal levels, and circuit count. Both support higher maximum frequencies (200MHz) and maintain the required functional characteristics.

Parameter Comparison

Engineering Selection Recommendations

CDCVF25081D is suitable for applications requiring tube packaging and standard cut tape availability. This variant maintains active product status with ROHS3 compliance, supporting extended operating temperature range (-40°C ~ 85°C) compared to the original IDT2308B-1DC specification. The higher maximum frequency rating (200MHz) provides operational margin above the 133.3MHz requirement.

CDCVF25081DR is the preferred selection for high-volume production and automated assembly processes. This variant is supplied in Tape & Reel (TR) packaging with significantly higher inventory availability (6351 Pcs). It maintains identical electrical and mechanical specifications to CDCVF25081D while offering the logistical advantages of reel packaging for pick-and-place equipment. ROHS3 compliance and active product status ensure long-term supply chain stability.

Both substitute parts exceed the original frequency specification and provide superior temperature operating range, enhancing system reliability in extended temperature environments. The transition from Renesas to Texas Instruments components requires no PCB layout modifications due to identical package geometry and pinout compatibility.

Frequently Asked Questions (FAQ)

Q: Can CDCVF25081D and CDCVF25081DR be used interchangeably in the same application?

A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format: CDCVF25081D is supplied in tube packaging, while CDCVF25081DR is supplied in Tape & Reel format. Selection depends on procurement and assembly requirements, not functional capability.

Q: What is the significance of the input-to-output ratio difference (1:8 vs. 2:8)?

A: The ratio difference reflects different internal multiplier configurations. The substitute parts (2:8 ratio) perform the same frequency multiplication function as the original (1:8 ratio) within the specified operating parameters. Both achieve the required output frequency range for the application.

Q: Are there PCB layout changes required when substituting from IDT2308B-1DC to CDCVF25081D or CDCVF25081DR?

A: No. Both substitute parts use identical 16-SOIC packaging with matching physical dimensions (0.154", 3.90mm Width). PCB footprints, trace routing, and component placement remain unchanged.

Q: Why do the substitute parts support a wider operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C)?

A: Texas Instruments CDCVF25081 series components are specified for industrial temperature ranges. This extended range provides additional design margin and system reliability, particularly in applications subject to temperature extremes.

Q: Is RoHS compliance a functional requirement for substitution?

A: RoHS compliance is a regulatory and supply chain consideration, not a functional requirement. The substitute parts (ROHS3 compliant) meet modern environmental standards, while the original IDT2308B-1DC is RoHS non-compliant. For new designs and regulated applications, ROHS3-compliant substitutes are required.

Q: What inventory considerations apply to these substitute parts?

A: CDCVF25081D is available in 1160 Pcs stock. CDCVF25081DR is available in 6351 Pcs stock. For production volumes requiring reel packaging and extended supply availability, CDCVF25081DR is the recommended selection.