onsemi MC10H188FNG

Overview

MC10H188FNG from ON Semiconductor is a high-speed MECL 10H™ hex buffer with common enable, delivering 1.3 ns typical propagation delay, −5.2 V VEE operation, and −1.95 V to −0.735 V output voltage swing. It functions as a level-shifting, noise-immune signal repeater in ECL logic systems, used in high-frequency data routing within telecom line cards and test equipment.

For engineers reviewing the MC10H188FNG datasheet, pinout, applications, or equivalent options, this part supports precise timing-critical buffering where sub-2 ns delay, 150 mV noise margin, and MECL 10K compatibility are required - especially in legacy ECL-based instrumentation and backplane interface designs.

Technical Context

The MC10H188FNG implements six independent non-inverting buffers sharing a single active-low enable input (pin 12), with outputs forced low when enabled and mirroring inputs when disabled. All inputs and outputs operate in the MECL 10H voltage domain, referenced to VEE = −5.2 V, and require 50 Ω termination to −2.0 V for specified AC performance.

Its internal design uses voltage-compensated differential pairs to maintain stable switching thresholds across temperature (0°C to +75°C) and supply variation, achieving improved noise margin (150 mV) over standard MECL 10K while retaining identical pinout and logic behavior - enabling drop-in replacement without layout change in compatible systems.

Key Specifications

Pinout & Package

MC10H188FNG is housed in a 20-lead plastic leaded chip carrier (PLCC-20), case 775, with J-lead configuration and Pb-free finish. The package is surface-mountable, moisture-sensitive level 3, and requires reflow per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC10H188FNG, MC100H188FNG offers wider temperature support and faster timing but at higher cost and power; MC10H188FN provides identical performance without RoHS compliance - making MC10H188FNG the optimal choice for new RoHS-compliant ECL designs operating within 0°C–75°C.

Availability

MC10H188FNG is available at Aetrix Electronics and suitable for digital test equipment, telecom line cards, radar signal processing, and high-performance oscilloscope front-ends requiring stable component supply and long-term obsolescence management.

Supply support for MC10H188FNG 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 is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, and communications markets.

The MC10H188FNG belongs to the MECL 10H™ family, engineered for high-speed ECL logic interoperability - specifically targeting legacy and upgrade paths in telecom infrastructure, test instrumentation, and defense electronics where nanosecond timing integrity is essential.

FAQ

What is the recommended termination for MC10H188FNG outputs?

MC10H188FNG outputs must be terminated with a 50 Ω resistor to −2.0 V to meet specified AC parameters including propagation delay and rise/fall times. This termination establishes the proper DC bias point and impedance match for ECL signaling integrity. Failure to use −2.0 V termination may result in degraded timing margins and increased jitter. The MC10H188FNG datasheet explicitly defines this condition in Table 3 and the AC test setup note.

Does MC10H188FNG support operation at VEE = −5.0 V?

MC10H188FNG is characterized and guaranteed for operation at VEE = −5.2 V ±5%, i.e., −4.94 V to −5.46 V. While −5.0 V falls within this range, performance parameters such as VOH, VOL, and propagation delay are only validated across the full −5.2 V ±5% window. Using −5.0 V is acceptable but requires verification of output voltage levels and timing against system-level noise and setup/hold margins. The MC10H188FNG electrical specifications assume −5.2 V nominal.

Can MC10H188FNG drive 75 Ω transmission lines?

No - MC10H188FNG is designed exclusively for 50 Ω ECL termination to −2.0 V, as specified in its AC characterization and truth table conditions. Driving a 75 Ω load alters the output voltage swing, degrades noise margin, and increases propagation delay beyond guaranteed limits. For 75 Ω systems, level translators or dedicated 75 Ω ECL drivers (e.g., MC100EP105) must be used instead of MC10H188FNG.

Is MC10H188FNG pin-compatible with MC10K188?

Yes - MC10H188FNG is a functional and pinout duplication of the MECL 10K™ family's MC10K188, as confirmed in the device description: "functional/pinout duplication of the standard MECL 10K™ family part." Pin assignments, terminal counts, and logic behavior (including active-low enable and output states) match exactly, enabling direct replacement in existing MC10K188 layouts without modification. This compatibility is a core design objective of the MC10H188FNG.

What is the maximum junction temperature for continuous operation of MC10H188FNG?

The MC10H188FNG has a maximum storage temperature of −55°C to +150°C (plastic package), and its operating temperature range is specified as 0°C to +75°C ambient. While absolute maximum junction temperature is not explicitly stated, derating calculations using θJA ≈ 50°C/W (typical for PLCC-20) and 180 mW dissipation yield TJ ≈ 84°C at +75°C ambient - within safe silicon limits. For sustained reliability, keep MC10H188FNG junction temperature below 125°C via adequate board copper and airflow.