onsemi MC10E122FNG

Overview

MC10E122FNG from ON Semiconductor is a 5V ECL 9-bit non-inverting buffer IC designed for high-speed clock and data distribution in telecom and test equipment. It delivers ≤500 ps max propagation delay, operates in PECL mode (VCC = 4.2–5.7 V, VEE = 0 V) or NECL mode (VCC = 0 V, VEE = −4.2 to −5.7 V), and features internal 50 kΩ input pulldowns for stub-free termination in backplane applications.

For engineers reviewing the MC10E122FNG datasheet, pinout, applications, or equivalent options, key selection criteria include its 800 MHz toggle frequency, ±75 ps within-device skew across all nine channels, ECL-compatible DC voltage thresholds, PLCC-28 package thermal resistance (63.5°C/W at 0 lfpm), and Pb-free compliance per JEDEC MSL Level 3.

Technical Context

The MC10E122FNG implements nine independent ECL buffer stages with matched propagation paths, enabling deterministic timing alignment in parallel data buses and clock fanout networks. Its architecture supports both PECL and NECL supply configurations without external level-shifting, and all VCC/VCCO pins are internally tied-requiring external connection to a single positive rail in PECL mode or ground in NECL mode.

Each input includes a 50 kΩ internal pulldown resistor, eliminating need for discrete termination on unterminated lines, while outputs drive 50 Ω loads terminated to VCC − 2.0 V-ensuring consistent signal integrity across temperature (0°C to +85°C) and supply variations. The device meets JEDEC JESD78 latchup immunity and UL 94 V-0 flammability standards.

Key Specifications

Pinout & Package

MC10E122FNG uses a 28-lead Plastic Leaded Chip Carrier (PLCC-28), case 776-02, with 0.050″ pitch and dimensions 0.490″ × 0.490″ (12.45 mm × 12.45 mm). The package is Pb-free (G suffix), moisture sensitivity level 3, and rated UL 94 V-0.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ECL buffer applications.

Compared with MC10E122FNG, MC100E122FNG offers improved DC consistency at temperature extremes but draws more supply current, while SY100EL12VZG provides modern 3.3V ECL operation in a smaller package-but requires PCB redesign due to incompatible pinout and voltage domain.

Availability

MC10E122FNG is available at Aetrix Electronics and suitable for telecom infrastructure, high-speed test instrumentation, radar signal processing, and industrial backplane systems requiring stable component supply across long production lifecycles.

Supply support for MC10E122FNG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MC10E122FNG belongs to the ECLinPS family-designed specifically for high-speed, low-skew clock and data distribution in telecom, military, and test equipment where deterministic timing and signal integrity are critical.

FAQ

What is the maximum operating frequency of the MC10E122FNG?

The MC10E122FNG supports a maximum toggle frequency of 800 MHz, verified across the full operating temperature range (0°C to +85°C) and both PECL and NECL supply configurations. This rating applies to individual channels under proper 50 Ω termination to VCC − 2.0 V and ≥500 lfpm airflow, making MC10E122FNG suitable for OC-48/STM-16 clock distribution and high-speed parallel bus applications.

Does the MC10E122FNG require external pull-down resistors on its inputs?

No-the MC10E122FNG integrates internal 50 kΩ pulldown resistors on all D0–D8 inputs, eliminating the need for external components to establish a known logic state on unterminated or stubbed lines. This feature simplifies layout in backplane and cable-driven systems and is explicitly confirmed in the "Features" section and Table 1 of the official datasheet.

Can the MC10E122FNG operate in both PECL and NECL modes simultaneously?

No-the MC10E122FNG operates in either PECL mode (VCC = 4.2–5.7 V, VEE = 0 V) or NECL mode (VCC = 0 V, VEE = −4.2 to −5.7 V), but not both at once. The supply configuration must be selected at power-up; mixing rails violates absolute maximum ratings and risks device damage. The logic diagram and Table 2 confirm separate, mutually exclusive operating conditions.

What is the thermal resistance (Junction-to-Ambient) for the MC10E122FNG in PLCC-28 package?

The MC10E122FNG in PLCC-28 package has a Junction-to-Ambient thermal resistance (θJA) of 63.5°C/W at 0 lfpm airflow and 43.5°C/W at 500 lfpm, as specified in Table 2 of the datasheet. These values assume standard board mounting per JEDEC 51-2 guidelines and are essential for calculating junction temperature rise under sustained 49 mA supply current in industrial environments.

Is the MC10E122FNG pin-compatible with the MC100E122FNG?

Yes-the MC10E122FNG and MC100E122FNG share identical PLCC-28 pinouts, terminal functions, and logic behavior, as confirmed by Figure 1 and Table 1 in the shared datasheet. However, they differ in DC performance (e.g., IEE, VOL tolerance) and AC consistency over temperature; MC100E122FNG is not a drop-in replacement unless those parameters meet design margins.