ICS557GI-03T Equivalent & Substitute Parts

Part Overview

The ICS557GI-03T is an Ethernet and PCI Express (PCIe) Spread Spectrum Clock Generator manufactured by Renesas Electronics Corporation. This 16-TSSOP surface mount IC generates 200MHz clock signals with PLL-based frequency synthesis, supporting both HCSL and LVDS output formats. The part is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. Active alternatives from Renesas, Diodes Incorporated, and onsemi provide direct functional replacement with improved availability and compliance status.

Key Parameters

Parameter	Value
Manufacturer Part Number	ICS557GI-03T
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Product Status	Obsolete
Frequency - Max	200MHz
Output Types	HCSL, LVDS
Input Types	Clock, Crystal
Voltage - Supply	2.97V ~ 3.63V
Operating Temperature	-40°C ~ 85°C
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
PLL	Yes
Number of Circuits	1
Ratio - Input:Output	1:2
Differential - Input:Output	No/Yes
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment of the following critical parameters:

Maximum frequency: 200MHz
Output signal types: HCSL and LVDS support
Input signal types: Clock and/or Crystal input capability
Supply voltage range: Minimum 3.0V to 3.6V overlap with original 2.97V ~ 3.63V
Package type: 16-TSSOP or 16-QSOP (mechanically compatible)
Operating temperature range: -40°C ~ 85°C
PLL functionality: Required
Input:Output ratio: 1:2
Differential input/output support: No/Yes

Substitutes are grouped by manufacturer and packaging format. All listed alternatives maintain functional equivalence within these defined parameters. Package variants (TSSOP vs. QSOP) are noted where they differ from the original 16-TSSOP footprint.

Parameter Comparison

Parameter	ICS557GI-03T	557GI-03LFT	PI6C557-03BLE	PI6C557-03BLEX	NB3N51032DTG	NB3N51032DTR2G	PI6C557-03BQE	PI6C557-03BQEX	PI6C557-03LEX
Manufacturer	Renesas	Renesas	Diodes Inc.	Diodes Inc.	onsemi	onsemi	Diodes Inc.	Diodes Inc.	Diodes Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Frequency - Max	200MHz	200MHz	200MHz	200MHz	200MHz	200MHz	200MHz	200MHz	200MHz
Output Types	HCSL, LVDS	HCSL, LVDS	HCSL, LVDS	HCSL, LVDS	HCSL, LVDS	HCSL, LVDS	HCSL, LVDS	HCSL, LVDS	HSTL, LVDS
Input Types	Clock, Crystal	Clock, Crystal	HCSL, Crystal	HCSL, Crystal	Clock, Crystal	Clock, Crystal	HCSL, Crystal	HCSL, Crystal	CMOS, Crystal
Voltage - Supply	2.97V ~ 3.63V	2.97V ~ 3.63V	3.0V ~ 3.6V	3.0V ~ 3.6V	3.135V ~ 3.465V	3.135V ~ 3.465V	3.0V ~ 3.6V	3.0V ~ 3.6V	3.0V ~ 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	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-TSSOP (0.173", 4.40mm)	16-TSSOP (0.173", 4.40mm)	16-TSSOP (0.173", 4.40mm)	16-TSSOP (0.173", 4.40mm)	16-TSSOP (0.173", 4.40mm)	16-TSSOP (0.173", 4.40mm)	16-SSOP (0.154", 3.90mm)	16-SSOP (0.154", 3.90mm)	16-TSSOP (0.173", 4.40mm)
PLL	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Number of Circuits	1	1	1	1	1	1	1	1	1
Ratio - Input:Output	1:2	1:2	1:2	1:2	1:2	1:2	1:2	1:2	1:2
Differential - Input:Output	No/Yes	No/Yes	No/Yes	No/Yes	No/Yes	No/Yes	No/Yes	No/Yes	No/Yes
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: 557GI-03LFT (Renesas)

The 557GI-03LFT is the direct Renesas equivalent with identical electrical specifications and 16-TSSOP packaging. This part maintains the original supply voltage range (2.97V ~ 3.63V) and achieves ROHS3 compliance, addressing the non-compliance status of the obsolete ICS557GI-03T. Inventory availability is substantial (19,241 units), supporting production continuity.

Secondary Recommendations: PI6C557-03BLEX or PI6C557-03LEX (Diodes Incorporated)

Both Diodes parts provide active product status with high inventory levels. PI6C557-03BLEX (35,100 units) and PI6C557-03LEX (22,800 units) maintain 16-TSSOP packaging and full functional equivalence. PI6C557-03LEX supports CMOS input in addition to Crystal, offering expanded input flexibility. All Diodes variants are ROHS3 compliant.

Alternative: NB3N51032DTR2G (onsemi)

The onsemi NB3N51032DTR2G provides active status with 2,600 units in stock. Supply voltage range (3.135V ~ 3.465V) is narrower than the original but remains within acceptable tolerance for most applications. Tape & Reel packaging is standard for production environments.

Package Variant Note: PI6C557-03BQE / PI6C557-03BQEX

These Diodes parts use 16-QSOP packaging (0.154", 3.90mm width) instead of 16-TSSOP (0.173", 4.40mm width). PCB layout modification is required. Select only if footprint redesign is feasible.

Frequently Asked Questions (FAQ)

Q: Can I use PI6C557-03BQE as a direct drop-in replacement?

A: No. The PI6C557-03BQE uses 16-QSOP packaging (0.154" width) versus the original 16-TSSOP (0.173" width). PCB footprint redesign is required. Use PI6C557-03BLEX or PI6C557-03LEX for true drop-in compatibility.

Q: What is the difference between PI6C557-03LEX and PI6C557-03BLEX?

A: Both are functionally equivalent 16-TSSOP parts with identical electrical performance. PI6C557-03LEX supports CMOS input in addition to Crystal input, while PI6C557-03BLEX supports HCSL and Crystal input. Select based on your input signal source requirements.

Q: Is the NB3N51032DTR2G supply voltage range acceptable?

A: The onsemi part operates at 3.135V ~ 3.465V, which is narrower than the original 2.97V ~ 3.63V. This is acceptable for designs with stable 3.3V supplies but may not be suitable for systems requiring the full original voltage range.

Q: Why is RoHS compliance important for this substitution?

A: The original ICS557GI-03T is RoHS non-compliant. All active substitutes are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and production.

Q: Can I mix packaging formats in the same design?

A: No. Maintain consistent packaging within a design. If using 16-TSSOP parts (557GI-03LFT, PI6C557-03BLEX, PI6C557-03LEX, NB3N51032DTR2G), do not substitute with 16-QSOP variants (PI6C557-03BQE, PI6C557-03BQEX) without PCB redesign.

Q: What is the MSL rating and why is it uniform across all parts?

A: All parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling procedures apply without special dry-pack requirements.

Q: Are input signal type differences critical for substitution?

A: Input type differences (Clock vs. HCSL vs. CMOS) are significant only if your circuit uses specific input signal formats. Verify your input source compatibility before selection. PI6C557-03LEX offers the broadest input compatibility with CMOS and Crystal support.

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