SY100E111LEJC Equivalent & Substitute Parts

Part Overview

The SY100E111LEJC is a Clock Fanout Buffer (Distribution) IC manufactured by Microchip Technology, featuring a 1:9 input-to-output ratio with PECL differential signaling. This component is designed for precision clock distribution in high-speed digital systems. The part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing system requirements while meeting current availability and compliance standards.

Key Parameters

Parameter	SY100E111LEJC
Manufacturer	Microchip Technology
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:9
Differential Input/Output	Yes/Yes
Input Signal Type	PECL
Output Signal Type	PECL
Voltage Supply Range	3V ~ 5.5V
Operating Temperature	0°C ~ 85°C
Package Type	28-LCC (J-Lead)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the SY100E111LEJC is determined by the following critical parameters:

Functional Equivalence: 1:9 fanout buffer topology with differential input and output capability
Signal Compatibility: PECL or ECL/PECL input and output support
Package Compatibility: 28-LCC (J-Lead) surface mount package
Voltage Supply Range: Overlap with original 3V ~ 5.5V specification
Operating Temperature: Support for at least 0°C ~ 85°C range

Substitute parts are grouped into two categories:

Upgrade Substitutes (Enhanced Performance): MC100LVE111FNG and MC100LVE111FNR2G offer higher frequency capability (1.5 GHz) with extended temperature range (-40°C ~ 85°C) and improved RoHS3 compliance, though with narrower supply voltage range (3V ~ 3.8V).

Manufacturer Recommended Substitutes (Direct Alternatives): CDC111FN, MC100E111FNG, and MC100E111FNR2G maintain functional equivalence with varying frequency specifications and compliance certifications.

Parameter Comparison

Parameter	SY100E111LEJC	MC100LVE111FNG	MC100LVE111FNR2G	CDC111FN	MC100E111FNG	MC100E111FNR2G
Manufacturer	Microchip	onsemi	onsemi	Texas Instruments	onsemi	onsemi
Type	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer
Ratio	1:9	1:9	1:9	1:9	1:9	1:9
Differential I/O	Yes/Yes	Yes/Yes	Yes/Yes	Yes/Yes	Yes/Yes	Yes/Yes
Input Type	PECL	ECL, PECL	ECL, PECL	LVPECL	ECL, PECL	ECL, PECL
Output Type	PECL	ECL, PECL	ECL, PECL	LVPECL	ECL, PECL	ECL, PECL
Frequency Max	Not specified	1.5 GHz	1.5 GHz	500 MHz	800 MHz	800 MHz
Voltage Supply	3V ~ 5.5V	3V ~ 3.8V	3V ~ 3.8V	3V ~ 3.6V	4.2V ~ 5.7V	4.2V ~ 5.7V
Operating Temp	0°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	28-LCC (J-Lead)	28-LCC (J-Lead)	28-LCC (J-Lead)	28-LCC (J-Lead)	28-LCC (J-Lead)	28-LCC (J-Lead)
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Obsolete	Obsolete	Active	Obsolete	Obsolete

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: CDC111FN (Texas Instruments) is the only active product with full ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). This part is suitable for new designs requiring regulatory compliance, though it operates at a reduced maximum frequency of 500 MHz and narrower temperature range (0°C ~ 70°C).

For Extended Temperature Range: MC100LVE111FNG and MC100LVE111FNR2G both support -40°C ~ 85°C operation with ROHS3 compliance and 1.5 GHz frequency capability. These are optimal for industrial and military applications requiring wider temperature specifications. The FNR2G variant is supplied in Tape & Reel packaging for automated assembly.

For Supply Voltage Compatibility: Systems operating at 4.2V ~ 5.7V should use MC100E111FNG or MC100E111FNR2G, which maintain the original supply voltage range of the SY100E111LEJC. Both are ROHS3 compliant with 800 MHz frequency support.

For Cost and Availability: MC100E111FNG has the highest inventory (36,100 pcs) among all substitutes, providing supply security for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can MC100LVE111FNG directly replace SY100E111LEJC in existing designs?

A: Functional replacement is possible due to identical 1:9 fanout topology and 28-LCC package. However, the supply voltage range differs (3V ~ 3.8V vs. 3V ~ 5.5V). Verify that your system operates within the 3V ~ 3.8V window before substitution. Both support PECL signaling and differential I/O.

Q: What is the difference between MC100LVE111FNG and MC100LVE111FNR2G?

A: Both parts are electrically identical with 1.5 GHz frequency, -40°C ~ 85°C temperature range, and ROHS3 compliance. The primary difference is packaging: FNG is supplied in Tube, while FNR2G is supplied in Tape & Reel (TR) format for automated pick-and-place assembly.

Q: Is CDC111FN suitable for high-frequency applications?

A: CDC111FN supports up to 500 MHz, which is lower than the original SY100E111LEJC specification. It is suitable for applications operating below 500 MHz. This part is the only active product available and offers full ROHS3 compliance with unlimited moisture sensitivity.

Q: What are the supply voltage constraints when substituting?

A: The original SY100E111LEJC operates at 3V ~ 5.5V. MC100LVE111 variants operate at 3V ~ 3.8V (narrower range), while MC100E111 variants operate at 4.2V ~ 5.7V (shifted higher). CDC111FN operates at 3V ~ 3.6V. Confirm your system's supply voltage falls within the substitute part's specified range.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant except the original SY100E111LEJC, which is RoHS non-compliant. If RoHS compliance is required, any of the listed substitutes are acceptable.

Q: What is the moisture sensitivity level (MSL) consideration?

A: SY100E111LEJC and CDC111FN have MSL 1 (unlimited shelf life). MC100LVE111 and MC100E111 variants have MSL 3 (168 hours), requiring controlled storage conditions. For long-term inventory, MSL 1 parts are preferred.

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