Renesas 2308B-2DCG Equivalent & Substitute Parts

Part Overview

The Renesas 2308B-2DCG is a Multiplier, Zero Delay Buffer IC operating at 133.3MHz in a 16-SOIC package. This component integrates PLL functionality with bypass capability, accepting LVTTL input and providing LVTTL output with a 1:8 input-to-output ratio. The device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	2308B-2DCG
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Multiplier, Zero Delay Buffer
Frequency - Max	133.3MHz
Input/Output Ratio	1:8
Input Signal Type	LVTTL
Output Signal Type	LVTTL
PLL with Bypass	Yes
Voltage Supply Range	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the 2308B-2DCG is determined by the following critical parameters:

Primary Substitution Criteria:

Package type (16-SOIC form factor)
Maximum frequency capability (minimum 133.3MHz)
Input/output signal compatibility (LVTTL)
Supply voltage range (3V ~ 3.6V)
PLL with bypass functionality
Surface mount technology

Substitution Categories:

Parametric Equivalent: Parts maintaining identical electrical specifications and package form factor. The 2308-2DCG meets all primary criteria with matching frequency, signal types, voltage range, and 16-SOIC packaging.

Functional Equivalent with Package Variation: The 2305A-1HDCGI provides zero delay buffer functionality with PLL and bypass capability in an 8-SOIC package. This represents a functional alternative where output count differs (1:5 ratio versus 1:8 ratio) and package size is reduced.

Cross-Manufacturer Equivalent: The Texas Instruments CDCVF25081D and CDCVF25081DR are PLL Clock Driver ICs in 16-SOIC packaging with enhanced frequency capability (200MHz) and matching supply voltage and signal type specifications.

Parameter Comparison

Parameter	2308B-2DCG (Main)	2308-2DCG	2305A-1HDCGI	CDCVF25081D	CDCVF25081DR
Manufacturer	Renesas	Renesas	Renesas	Texas Instruments	Texas Instruments
Type	Multiplier, Zero Delay Buffer	Multiplier, Zero Delay Buffer	Zero Delay Buffer	PLL Clock Driver	PLL Clock Driver
Frequency - Max	133.3MHz	133.3MHz	133MHz	200MHz	200MHz
Input/Output Ratio	1:8	1:8	1:5	2:8	2:8
Input Signal Type	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL
Output Signal Type	LVTTL	LVTTL	CMOS, LVCMOS, TTL	LVTTL	LVTTL
PLL with Bypass	Yes	Yes	Yes	Yes	Yes
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-SOIC	16-SOIC	8-SOIC	16-SOIC	16-SOIC
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

2308-2DCG (Parametric Equivalent): This Renesas part provides identical electrical and mechanical specifications to the 2308B-2DCG, including matching frequency, signal types, package form factor, and supply voltage. Both parts are classified as obsolete. The 2308-2DCG offers improved moisture sensitivity rating (MSL 1 versus MSL 3), providing better long-term reliability in storage and handling. This is the preferred direct replacement when package and electrical specifications must remain unchanged.

2305A-1HDCGI (Functional Equivalent - Renesas): This active-status zero delay buffer from Renesas maintains LVTTL input compatibility and PLL with bypass functionality. The 8-SOIC package reduces board space requirements compared to the 16-SOIC form factor. The 1:5 output ratio differs from the original 1:8 ratio, and output signal options expand to include CMOS and LVCMOS in addition to LVTTL. Operating temperature range extends to -40°C ~ 85°C. Selection of this part requires circuit redesign to accommodate the reduced output count and smaller package footprint.

CDCVF25081D and CDCVF25081DR (Cross-Manufacturer Equivalents - Texas Instruments): These PLL Clock Driver ICs from Texas Instruments provide enhanced frequency capability at 200MHz, exceeding the 133.3MHz specification of the original part. Both maintain 16-SOIC packaging, LVTTL input/output compatibility, and 3V ~ 3.6V supply voltage. The 2:8 input-to-output ratio differs from the 1:8 ratio of the 2308B-2DCG. Both parts carry active product status and MSL 1 rating. The CDCVF25081DR is supplied in tape and reel packaging, while the CDCVF25081D is supplied in tube packaging. These parts are suitable for applications where higher frequency headroom is beneficial and circuit topology can accommodate the different input-to-output ratio.

Frequently Asked Questions (FAQ)

Q: Can the 2305A-1HDCGI directly replace the 2308B-2DCG in existing designs?

A: Direct replacement is not recommended without circuit evaluation. While both parts share LVTTL input compatibility, PLL with bypass functionality, and identical supply voltage range, the 2305A-1HDCGI operates with a 1:5 output ratio compared to the original 1:8 ratio. Additionally, the 8-SOIC package differs from the 16-SOIC form factor, requiring PCB layout modifications. Output signal type options differ, with the 2305A-1HDCGI supporting CMOS and LVCMOS in addition to LVTTL.

Q: What are the key differences between the Renesas and Texas Instruments substitutes?

A: The Renesas 2308-2DCG maintains identical specifications to the original part with improved moisture sensitivity rating. The Texas Instruments CDCVF25081D and CDCVF25081DR provide higher frequency capability (200MHz versus 133.3MHz) and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), but operate with a 2:8 input-to-output ratio rather than 1:8. All three substitutes maintain 16-SOIC packaging and LVTTL signal compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 2308-2DCG, 2305A-1HDCGI, CDCVF25081D, and CDCVF25081DR are all ROHS3 compliant, meeting environmental and regulatory requirements equivalent to the original 2308B-2DCG.

Q: What is the significance of MSL rating differences?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions before soldering. The original 2308B-2DCG carries MSL 3 (168 hours), while all substitute parts carry MSL 1 (unlimited). Lower MSL ratings provide greater flexibility in storage, handling, and manufacturing processes without requiring specialized dry-pack storage or baking procedures.

Q: Which substitute is recommended for new designs?

A: For new designs requiring clock multiplication and zero delay buffering at 133.3MHz or higher with LVTTL compatibility, the Texas Instruments CDCVF25081D or CDCVF25081DR are recommended due to active product status, extended operating temperature range, and higher frequency capability. For designs requiring exact electrical and package compatibility with the original specification, the Renesas 2308-2DCG is the appropriate choice, though both original and this substitute are classified as obsolete.

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