100EL11MX Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The 100EL11MX is an obsolete clock fanout buffer (distribution) IC manufactured by onsemi, designed for 1:2 signal distribution in ECL logic applications. This device operates within a 4.2V to 5.5V supply range and supports operating temperatures from -40°C to 85°C in an 8-SOIC surface mount package.

Due to its obsolete product status, identifying functionally equivalent and compatible substitute parts is essential for system redesign, board revisions, and long-term supply chain continuity. Substitute parts must maintain electrical compatibility across input/output signal types, voltage supply ranges, and package form factors while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	100EL11MX Specification
Manufacturer	onsemi
Category	Clock/Timing
Type	Fanout Buffer (Distribution)
Number of Circuits	1
Ratio - Input:Output	1:2
Differential - Input:Output	Yes/Yes
Input Signal Type	ECL
Output Signal Type	ECL
Voltage - Supply	4.2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution logic for the 100EL11MX is based on the following critical parameters:

Primary Compatibility Criteria:

Package form factor: 8-SOIC (0.154", 3.90mm Width) — all substitutes maintain identical physical dimensions
Circuit configuration: 1:2 fanout buffer topology with differential input and output
Signal type compatibility: ECL input/output capability (substitutes may support additional signal types such as PECL, CML, or LVDS)
Operating temperature range: -40°C to 85°C (all substitutes meet or exceed this range)
Mounting type: Surface mount (all substitutes are surface mount)

Substitution Groups:

Group 1: Direct ECL/PECL Equivalents (1.5 GHz) MC100EL11DG and MC100EL11DR2G are active-status onsemi parts with identical 1:2 ratio, differential I/O, and 8-SOIC packaging. These support both ECL and PECL input/output, operate at 4.2V–5.7V, and reach 1.5 GHz maximum frequency. Packaging differs (Tube vs. Tape & Reel) but electrical performance is identical.

Group 2: Higher Frequency Alternatives (3 GHz) MC100EP11DG and MC100EP11DR2G extend maximum frequency to 3 GHz while maintaining 1:2 fanout configuration and 8-SOIC packaging. Supply voltage range shifts to 3V–5.5V. These are active-status parts suitable for higher-speed applications.

Group 3: Low-Voltage Variants (1 GHz) MC100LVEL11DG and MC100LVEL11DR2G operate at reduced supply voltage (3V–3.8V) with 1 GHz maximum frequency. These maintain 1:2 fanout and 8-SOIC packaging but are optimized for low-power applications.

Group 4: Low-Voltage High-Speed Variants (3 GHz) MC100LVEP11DG and MC100LVEP11DR2G combine low-voltage operation (2.375V–3.8V) with 3 GHz frequency capability. Input compatibility extends to CML and LVDS in addition to PECL. These are suitable for modern low-power, high-speed designs.

Group 5: Legacy MC10 Series (1.5 GHz) MC10EL11DG and MC10EL11DR2G are active-status alternatives with identical electrical specifications to Group 1 (1.5 GHz, ECL/PECL, 4.2V–5.7V) but carry the MC10 product line designation.

Parameter Comparison

Part Number	Manufacturer	Product Status	Frequency - Max	Input Type	Output Type	Voltage - Supply	Packaging	RoHS Status
100EL11MX	onsemi	Obsolete	Not specified	ECL	ECL	4.2V ~ 5.5V	Tube	Not specified
MC100EL11DG	onsemi	Active	1.5 GHz	ECL, PECL	ECL, PECL	4.2V ~ 5.7V	Tube	ROHS3 Compliant
MC100EL11DR2G	onsemi	Active	1.5 GHz	ECL, PECL	ECL, PECL	4.2V ~ 5.7V	Tape & Reel (TR)	ROHS3 Compliant
MC100EP11DG	onsemi	Active	3 GHz	ECL, PECL	ECL, PECL	3V ~ 5.5V	Tube	ROHS3 Compliant
MC100EP11DR2G	onsemi	Active	3 GHz	ECL, PECL	ECL, PECL	3V ~ 5.5V	Tape & Reel (TR)	ROHS3 Compliant
MC100LVEL11DG	Motorola	Active	1 GHz	ECL, PECL	ECL, PECL	3V ~ 3.8V	Not specified	Not specified
MC100LVEL11DR2G	onsemi	Active	1 GHz	ECL, PECL	ECL, PECL	3V ~ 3.8V	Tape & Reel (TR)	ROHS3 Compliant
MC100LVEP11DG	onsemi	Active	3 GHz	CML, LVDS, PECL	ECL, PECL	2.375V ~ 3.8V	Tube	ROHS3 Compliant
MC100LVEP11DR2G	onsemi	Active	3 GHz	CML, LVDS, PECL	ECL, PECL	2.375V ~ 3.8V	Tape & Reel (TR)	ROHS3 Compliant
MC10EL11DG	onsemi	Active	1.5 GHz	ECL, PECL	ECL, PECL	4.2V ~ 5.7V	Tube	ROHS3 Compliant
MC10EL11DR2G	onsemi	Active	1.5 GHz	ECL, PECL	ECL, PECL	4.2V ~ 5.7V	Tape & Reel (TR)	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Minimum Design Change): Select MC100EL11DG or MC100EL11DR2G. Both are active-status onsemi products with ROHS3 compliance, identical 1:2 fanout configuration, and 8-SOIC packaging. The supply voltage range (4.2V–5.7V) encompasses the original 100EL11MX specification. Choose the Tape & Reel variant (MC100EL11DR2G) for production volumes; select the Tube variant (MC100EL11DG) for prototyping or low-volume applications.

For Higher-Speed Applications: Select MC100EP11DG or MC100EP11DR2G if system requirements permit operation at 3 GHz. These maintain identical package and fanout configuration while extending frequency capability. Supply voltage range (3V–5.5V) remains compatible with standard 5V logic supplies.

For Low-Power System Designs: Select MC100LVEL11DR2G for 1 GHz applications or MC100LVEP11DR2G for 3 GHz applications. Both operate at reduced supply voltage (3V–3.8V and 2.375V–3.8V respectively) and carry ROHS3 compliance. The MC100LVEP11DR2G additionally supports CML and LVDS input signals, enabling integration with modern low-voltage differential signaling architectures.

Compliance Considerations: All recommended active-status substitutes carry ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements. The original 100EL11MX carries no specified RoHS status; migration to any active substitute ensures compliance with modern manufacturing and supply chain standards.

Frequently Asked Questions (FAQ)

Q: Can MC100EL11DG directly replace 100EL11MX without circuit modification? A: Yes. Both devices maintain identical 1:2 fanout buffer topology, 8-SOIC package dimensions, differential ECL input/output, and overlapping supply voltage ranges (4.2V–5.5V for 100EL11MX; 4.2V–5.7V for MC100EL11DG). No circuit redesign is required for electrical compatibility. Verify PCB layout and signal integrity for your specific application frequency.

Q: What is the difference between Tube and Tape & Reel packaging? A: Tube packaging (DG suffix) is suitable for prototyping, evaluation, and low-volume production. Tape & Reel packaging (DR2G suffix) is optimized for automated assembly and high-volume manufacturing. Electrical performance is identical; packaging choice depends on production volume and assembly process.

Q: Can I use MC100EP11DR2G (3 GHz) as a substitute if my application only requires 1.5 GHz? A: Yes. The MC100EP11DR2G is backward-compatible with lower-frequency applications. It maintains the same 1:2 fanout configuration, 8-SOIC package, and differential I/O. The 3 GHz maximum frequency specification indicates capability, not a requirement. Supply voltage range (3V–5.5V) is compatible with standard 5V supplies.

Q: What are the key differences between MC100EL11 and MC100LVEP11 series? A: MC100EL11 operates at standard voltage (4.2V–5.7V) with 1.5 GHz maximum frequency and ECL/PECL I/O. MC100LVEP11 operates at low voltage (2.375V–3.8V) with 3 GHz maximum frequency and supports CML, LVDS, and PECL input signals. Select MC100LVEP11 for modern low-power, high-speed designs; select MC100EL11 for compatibility with existing 5V logic systems.

Q: Is the MC10EL11 series equivalent to the MC100EL11 series? A: Electrically, yes. Both MC10EL11DG and MC100EL11DG share identical specifications: 1.5 GHz maximum frequency, 1:2 fanout, ECL/PECL I/O, 4.2V–5.7V supply, and 8-SOIC packaging. The MC10 designation represents a legacy product line; MC100 represents the current product line. Both are active-status with ROHS3 compliance. For new designs, prefer MC100EL11 series; for legacy system maintenance, either series is acceptable.

Q: Does the 100EL11MX support PECL input/output? A: The 100EL11MX datasheet specifies ECL input and output only. However, all recommended active substitutes (MC100EL11, MC100EP11, MC100LVEL11, MC100LVEP11 series) support both ECL and PECL I/O. PECL compatibility in substitutes provides enhanced flexibility for mixed-signal designs without compromising ECL-only legacy systems.

Q: What is the moisture sensitivity level (MSL) for substitute parts? A: All onsemi substitute parts carry MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling. This matches the 100EL11MX specification and simplifies supply chain management and board assembly processes.

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