ICS2305M-1H Equivalent & Substitute Parts

Part Overview

The ICS2305M-1H 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 parts necessary for ongoing system support and new design implementations. Substitute parts must maintain electrical compatibility across frequency, voltage supply, package type, and output logic levels.

Key Parameters

Parameter	ICS2305M-1H
Manufacturer	Renesas Electronics Corporation
Type	Fanout Buffer (Distribution), Zero Delay Buffer
Frequency - Max	133MHz
Ratio - Input:Output	1:5
Voltage - Supply	3V ~ 3.6V
Output Logic	CMOS, TTL
Number of Circuits	1
Package / Case	8-SOIC (0.154", 3.90mm Width)
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
PLL	Yes with Bypass
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the ICS2305M-1H is determined by the following critical parameters:

Package Type: All substitutes must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging for PCB compatibility
Frequency Rating: Maximum frequency must be 133MHz or higher to support the original operating specification
Input-to-Output Ratio: Must maintain 1:5 ratio for signal distribution functionality
Voltage Supply Range: Must support 3V ~ 3.6V operation
Output Logic Compatibility: Output must support either CMOS or TTL logic levels
Number of Circuits: Single circuit configuration required

All identified substitute parts meet these core electrical and mechanical parameters. Variations in operating temperature range, RoHS compliance status, and product lifecycle status are secondary considerations that do not affect functional substitution.

Parameter Comparison

Part Number	Manufacturer	Type	Frequency - Max	Ratio	Voltage Supply	Output Logic	Package	Operating Temp	Product Status	RoHS Status
ICS2305M-1H	Renesas Electronics	Fanout Buffer, Zero Delay Buffer	133MHz	1:5	3V ~ 3.6V	CMOS, TTL	8-SOIC	0°C ~ 70°C	Obsolete	RoHS non-compliant
NB2305AI1HDG	onsemi	Zero Delay Buffer	133MHz	1:5	3V ~ 3.6V	CMOS	8-SOIC	-40°C ~ 85°C	Obsolete	ROHS3 Compliant
PI6C2405A-1HWEX	Diodes Incorporated	Zero Delay Buffer	133MHz	1:5	3V ~ 3.6V	TTL	8-SOIC	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant
PI6C2405A-1WE	Diodes Incorporated	Zero Delay Buffer	133MHz	1:5	3V ~ 3.6V	TTL	8-SOIC	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant
PI6C2405A-1WEX	Diodes Incorporated	Zero Delay Buffer	133MHz	1:5	3V ~ 3.6V	TTL	8-SOIC	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant
PL123-05HSC	Microchip Technology	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	Clock	8-SOIC	0°C ~ 70°C	Active	ROHS3 Compliant
PL123-05HSC-R	Microchip Technology	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	Clock	8-SOIC	0°C ~ 70°C	Active	ROHS3 Compliant
PL123-05HSI	Microchip Technology	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	Clock	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
PL123-05SC	Microchip Technology	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	Clock	8-SOIC	0°C ~ 70°C	Active	ROHS3 Compliant
PL123-05SC-R	Microchip Technology	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	Clock	8-SOIC	0°C ~ 70°C	Active	ROHS3 Compliant
PL123-05SI	Microchip Technology	Clock Multiplexer	134MHz	1:5	3V ~ 3.6V	Clock	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs)

The Microchip Technology PL123 series (PL123-05HSC, PL123-05HSC-R, PL123-05HSI, PL123-05SC, PL123-05SC-R, PL123-05SI) are the preferred substitutes. These parts are in active product status, ROHS3 compliant, and operate at 134MHz, exceeding the original 133MHz specification. The extended temperature variants (PL123-05HSI, PL123-05SI) support -40°C ~ 85°C operation for applications requiring wider thermal ranges. Packaging options include Tube and Tape & Reel configurations to match procurement requirements.

Secondary Substitutes (For Existing Inventory)

The Diodes Incorporated PI6C2405A series (PI6C2405A-1HWEX, PI6C2405A-1WE, PI6C2405A-1WEX) are classified as Last Time Buy and provide direct electrical equivalence with TTL output logic. These parts maintain the 0°C ~ 70°C operating temperature range of the original ICS2305M-1H and are ROHS3 compliant. Packaging is available in Cut Tape and Tube formats.

Alternative Substitute (Extended Temperature)

The onsemi NB2305AI1HDG offers CMOS output logic with extended operating temperature range (-40°C ~ 85°C) and ROHS3 compliance. This part is classified as obsolete but remains functionally equivalent for applications requiring wider thermal operation.

Frequently Asked Questions (FAQ)

Q: Can I directly replace ICS2305M-1H with any of these substitute parts?

A: Yes, all listed substitute parts maintain the critical electrical parameters: 8-SOIC package, 133MHz or higher frequency rating, 1:5 input-to-output ratio, and 3V ~ 3.6V supply voltage. Physical PCB footprint compatibility is identical across all parts.

Q: What is the difference between the Microchip PL123 variants (HSC, HSI, SC, SI)?

A: The variants differ in packaging and operating temperature range. HSC and SC variants operate at 0°C ~ 70°C, while HSI and SI variants support -40°C ~ 85°C. Packaging options include Tube (HSC, HSI, SC, SI) and Tape & Reel (HSC-R, SC-R). All maintain identical electrical specifications.

Q: Are there output logic differences between substitutes?

A: Yes. The original ICS2305M-1H supports both CMOS and TTL outputs. The Diodes Incorporated PI6C2405A series provides TTL output. The onsemi NB2305AI1HDG provides CMOS output. The Microchip PL123 series provides Clock output. Verify output logic compatibility with your system requirements before selection.

Q: Why is the Microchip PL123 series recommended for new designs?

A: The PL123 series is in active product status with ROHS3 compliance and superior frequency rating (134MHz). This ensures long-term availability and regulatory compliance for new product development.

Q: What is the significance of "Last Time Buy" status for Diodes Incorporated parts?

A: Last Time Buy indicates the manufacturer has announced end-of-life for these parts. Existing inventory is available, but no future production is planned. These parts are suitable for legacy system support but not recommended for new designs requiring extended product lifecycle.

Q: Do all substitutes use the same 8-SOIC package?

A: Yes. All substitute parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring identical PCB footprint and reflow soldering compatibility.

Q: Which substitute offers the widest operating temperature range?

A: The Microchip PL123-05HSI and PL123-05SI, along with the onsemi NB2305AI1HDG, support -40°C ~ 85°C operation, compared to the original 0°C ~ 70°C range.

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