ICS2305M-1 Equivalent & Substitute Parts

Part Overview

The ICS2305M-1 is a Fanout Buffer (Distribution) Zero Delay Buffer IC manufactured by Renesas Electronics Corporation. This 8-SOIC surface mount device operates at 133MHz with a 1:5 input-to-output ratio, supporting CMOS and TTL output configurations. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	ICS2305M-1
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Fanout Buffer (Distribution), Zero Delay Buffer
Frequency - Max	133MHz
Ratio - Input:Output	1:5
Voltage - Supply	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Number of Circuits	1
PLL	Yes with Bypass
Input	Clock
Output	CMOS, TTL
Divider/Multiplier	No/No
Differential - Input:Output	No/No
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the ICS2305M-1 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Maximum frequency: 133MHz or higher
Input-to-output ratio: 1:5
Supply voltage range: 3V ~ 3.6V
Package type: 8-SOIC (0.154", 3.90mm Width)
Surface mount configuration
Single circuit configuration
PLL with bypass capability

Substitute Categories:

Category 1: Direct Electrical Equivalents (Obsolete Status)

NB2305AI1HDG (onsemi): Zero Delay Buffer with identical electrical specifications. Operating temperature extended to -40°C ~ 85°C. RoHS3 compliant.

Category 2: Manufacturer Recommended Alternatives (Last Time Buy Status)

PI6C2405A-1HWEX, PI6C2405A-1WE, PI6C2405A-1WEX (Diodes Incorporated): Zero Delay Buffer ICs with TTL input/output configuration. All rated 133MHz, 1:5 ratio, 3V ~ 3.6V supply. RoHS3 compliant. Available in Cut Tape and Tube packaging.

Category 3: Active Production Alternatives (Microchip Technology)

PL123-05HSC, PL123-05HSC-R, PL123-05HSI, PL123-05SC, PL123-05SC-R, PL123-05SI: Clock Multiplexer ICs with 134MHz maximum frequency, 1:5 ratio, 3V ~ 3.6V supply. All feature PLL with bypass. RoHS3 compliant. Available in multiple packaging and temperature options.

Parameter Comparison

Part Number	Manufacturer	Type	Frequency - Max	Ratio 1:Output	Supply Voltage	Operating Temp	Package	RoHS Status	Product Status
ICS2305M-1	Renesas	Fanout Buffer	133MHz	1:5	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	Non-compliant	Obsolete
NB2305AI1HDG	onsemi	Zero Delay Buffer	133MHz	1:5	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	RoHS3	Obsolete
PI6C2405A-1HWEX	Diodes Inc.	Zero Delay Buffer	133MHz	1:5	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	RoHS3	Last Time Buy
PI6C2405A-1WE	Diodes Inc.	Zero Delay Buffer	133MHz	1:5	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	RoHS3	Last Time Buy
PI6C2405A-1WEX	Diodes Inc.	Zero Delay Buffer	133MHz	1:5	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	RoHS3	Last Time Buy
PL123-05HSC	Microchip	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	RoHS3	Active
PL123-05HSC-R	Microchip	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	RoHS3	Active
PL123-05HSI	Microchip	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	RoHS3	Active
PL123-05SC	Microchip	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	RoHS3	Active
PL123-05SC-R	Microchip	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	RoHS3	Active
PL123-05SI	Microchip	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	RoHS3	Active

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: All substitute parts listed are RoHS3 compliant, addressing the non-compliant status of the original ICS2305M-1. Selection among substitutes depends on product lifecycle status and temperature operating range requirements.

For Immediate Obsolescence Mitigation: The NB2305AI1HDG (onsemi) provides the closest functional match with extended operating temperature range (-40°C ~ 85°C) while maintaining obsolete product status. This option is suitable for designs requiring minimal qualification effort.

For Long-Term Production Continuity: Microchip Technology PL123 series parts (PL123-05HSC, PL123-05HSC-R, PL123-05HSI, PL123-05SC, PL123-05SC-R, PL123-05SI) are in active production status, providing the most reliable long-term supply chain. The 134MHz maximum frequency exceeds the original 133MHz specification, ensuring forward compatibility.

For Temperature-Extended Applications: PL123-05HSI and PL123-05SI support -40°C ~ 85°C operating range, suitable for industrial and automotive environments. NB2305AI1HDG also provides this extended range.

For Standard Commercial Temperature Range: PL123-05HSC, PL123-05HSC-R, PL123-05SC, and PL123-05SC-R maintain 0°C ~ 70°C operating range matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can the ICS2305M-1 be directly replaced with any of these substitutes?

A: All listed substitutes meet the critical electrical parameters: 133MHz or higher frequency, 1:5 input-to-output ratio, 3V ~ 3.6V supply voltage, and 8-SOIC package. Direct pin-level compatibility is supported across all alternatives. However, input/output signal type differences (CMOS vs. TTL) must be evaluated for specific circuit requirements.

Q: What is the difference between the Diodes Incorporated PI6C2405A variants?

A: The PI6C2405A-1HWEX, PI6C2405A-1WE, and PI6C2405A-1WEX differ in packaging format: Cut Tape (CT) for -1HWEX and -1WEX, and Tube for -1WE. All three share identical electrical specifications and are rated for 0°C ~ 70°C operation. Selection depends on assembly process requirements.

Q: Why do the Microchip PL123 parts have a higher maximum frequency (134MHz) than the original?

A: The 134MHz specification represents the maximum rated frequency for the PL123 series. This higher rating ensures the part operates within specification at the original 133MHz requirement, providing design margin and long-term reliability.

Q: Are there temperature-related constraints when selecting a substitute?

A: Yes. The original ICS2305M-1 operates 0°C ~ 70°C. Substitutes with identical temperature range include PI6C2405A variants, PL123-05HSC, PL123-05HSC-R, PL123-05SC, and PL123-05SC-R. Extended range options (-40°C ~ 85°C) include NB2305AI1HDG, PL123-05HSI, and PL123-05SI, suitable for industrial applications.

Q: What is the significance of RoHS3 compliance for these substitutes?

A: All substitute parts are RoHS3 compliant, addressing environmental and regulatory requirements. The original ICS2305M-1 is RoHS non-compliant. Substitution enables compliance with current electronics manufacturing standards.

Q: Which substitute offers the best long-term availability?

A: Microchip Technology PL123 series parts maintain active production status, providing the most reliable long-term supply chain compared to obsolete (ICS2305M-1, NB2305AI1HDG) or Last Time Buy (PI6C2405A variants) alternatives.

Q: Do packaging options affect electrical performance?

A: No. Packaging format (Tube, Cut Tape, Tape & Reel) affects handling and assembly logistics only. Electrical performance and specifications remain identical across packaging variants of the same part number.

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