NB2305AI1D Zero Delay Buffer IC Equivalent & Substitute Parts

Part Overview

The NB2305AI1D is a Zero Delay Buffer IC manufactured by onsemi, designed for clock distribution and timing applications requiring 133MHz maximum frequency operation. This device features a 1:5 input-to-output ratio with CMOS input and output compatibility, housed in an 8-SOIC surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Renesas Electronics Corporation offers functionally compatible alternatives with active product status and enhanced compliance certifications.

Key Parameters

Parameter	Value
Type	Zero Delay Buffer
Frequency - Max	133MHz
Ratio - Input:Output	1:5
PLL	Yes
Input Signal Type	CMOS
Output Signal Type	CMOS
Number of Circuits	1
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the NB2305AI1D is determined by strict alignment of the following critical parameters: maximum frequency (133MHz), input-to-output ratio (1:5), PLL functionality, supply voltage range (3V ~ 3.6V), operating temperature range (-40°C ~ 85°C), package type (8-SOIC), and mounting method (Surface Mount).

The NB2305AI1HDG from onsemi is a parametric equivalent offering identical electrical specifications with improved RoHS3 compliance and higher inventory availability. Renesas Electronics Corporation provides a series of functionally compatible alternatives (2305-1 and 2305A/2305B variants) that maintain all critical electrical parameters while offering active product status and enhanced compliance certifications. These Renesas parts accept LVTTL input signals and provide expanded output compatibility (CMOS, LVCMOS, TTL), enabling broader system integration while preserving core zero-delay buffer functionality.

Parameter Comparison

Parameter	NB2305AI1D (Main)	NB2305AI1HDG	2305-1DCGI	2305-1HDCGI	2305A-1DCGI	2305A-1HDCGI	2305B-1DCGI
Manufacturer	onsemi	onsemi	Renesas	Renesas	Renesas	Renesas	Renesas
Type	Zero Delay Buffer	Zero Delay Buffer	Zero Delay Buffer	Zero Delay Buffer	Zero Delay Buffer	Zero Delay Buffer	Zero Delay Buffer
Frequency - Max	133MHz	133MHz	133MHz	133MHz	133MHz	133MHz	133MHz
Ratio - Input:Output	1:5	1:5	1:5	1:5	1:5	1:5	1:5
PLL	Yes	Yes	Yes with Bypass	Yes with Bypass	Yes with Bypass	Yes with Bypass	Yes with Bypass
Input Signal Type	CMOS	CMOS	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL
Output Signal Type	CMOS	CMOS	CMOS, LVCMOS, TTL	CMOS, LVCMOS, TTL	CMOS, LVCMOS, TTL	CMOS, LVCMOS, TTL	CMOS, LVCMOS, TTL
Number of Circuits	1	1	1	1	1	1	1
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For new designs and production continuity, the Renesas Electronics Corporation 2305-1 and 2305A series parts are preferred substitutes due to active product status and ROHS3 compliance certification. These parts maintain all critical electrical parameters while offering expanded output signal compatibility (CMOS, LVCMOS, TTL) compared to the original NB2305AI1D specification.

The NB2305AI1HDG from onsemi provides a direct parametric equivalent with identical electrical specifications and improved RoHS3 compliance, suitable for applications requiring strict onsemi component sourcing. However, this part retains obsolete product status classification.

Packaging variants (Tube, Tape & Reel, standard) are available across the Renesas product line. Selection between 2305-1, 2305A, and 2305B base product numbers does not affect electrical performance; differentiation is based on packaging and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the NB2305AI1D be directly replaced with Renesas 2305-1 series parts?

A: Yes. The 2305-1DCGI, 2305-1HDCGI, and their tape-and-reel variants (2305-1DCGI8, 2305-1HDCGI8) maintain identical electrical specifications including 133MHz maximum frequency, 1:5 input-to-output ratio, PLL functionality, 3V ~ 3.6V supply voltage, and 8-SOIC package. The primary difference is LVTTL input compatibility and expanded output signal types (CMOS, LVCMOS, TTL) on Renesas parts, which provides broader system integration capability.

Q: What is the difference between 2305-1, 2305A, and 2305B variants?

A: All three base product numbers (2305-1, 2305A, 2305B) share identical electrical specifications and package types. Differentiation is based on manufacturing date codes and inventory availability. Selection between these variants does not affect circuit performance or compatibility.

Q: Does packaging type (Tube vs. Tape & Reel) affect electrical performance?

A: No. Packaging type (Tube, Tape & Reel, or standard) is a logistics and handling specification only. The 8-SOIC package dimensions and electrical characteristics remain constant across all packaging options. Selection should be based on assembly process requirements and inventory management.

Q: Why do Renesas parts specify LVTTL input instead of CMOS input?

A: LVTTL input compatibility is a superset of CMOS input compatibility. LVTTL (Low Voltage TTL) accepts CMOS-level signals while providing additional input threshold flexibility. This expanded input specification does not compromise performance with CMOS source signals and enables broader system integration.

Q: Are there compliance differences between onsemi and Renesas alternatives?

A: Yes. The original NB2305AI1D is RoHS non-compliant. The NB2305AI1HDG (onsemi) and all Renesas 2305-series parts are ROHS3 compliant. For applications subject to RoHS directives or customer compliance requirements, Renesas alternatives are required.

Q: Can the NB2305AI1D be used in new production designs?

A: The NB2305AI1D is classified as obsolete. For new designs, Renesas 2305-1, 2305A, or 2305B series parts are recommended to ensure long-term supply availability and compliance with current environmental regulations.

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