onsemi MC10H188MELG

Overview

MC10H188MELG 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 180 mW typical power dissipation per package. It functions as a level-shifting, noise-immune signal repeater in ECL logic systems, supporting critical timing paths in telecom line cards and high-speed test equipment.

For engineers reviewing the MC10H188MELG datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, SOEIAJ-16 package details, MECL 10K compatibility confirmation, and validated alternative options for legacy ECL system upgrades and replacement sourcing.

Technical Context

The MC10H188MELG implements six independent non-inverting buffers sharing a single active-low enable input (pin 1), where low-enable activates output mirroring of inputs and high-enable forces all outputs low. Its voltage-compensated design maintains stable VOH/VOL across temperature (0°C to +75°C) and supply variation (VEE = −5.2 V ±5%).

All inputs and outputs are compatible with MECL 10K logic levels, with VIH/VIL thresholds centered at −1.0 V and −1.7 V respectively, and outputs terminated into 50 Ω to −2.0 V. Rise/fall times are tightly controlled at 0.7–2.4 ns, enabling reliable operation in >500 MHz clock distribution and data strobing applications.

Key Specifications

Pinout & Package

MC10H188MELG uses the SOEIAJ-16 (JEDEC MS-012AC) surface-mount package (Case 966), measuring 9.90 × 5.10 mm with 1.27 mm pitch, lead-free (Pb-free) finish, and gull-wing leads optimized for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC10H188MELG, MC100H188FN offers identical logic behavior but demands mechanical redesign, while SN65EL188DGGR delivers faster speed at the cost of incompatible supply architecture - making MC10H188MELG the sole drop-in solution for −5.2 V MECL 10K infrastructure upgrades.

Availability

MC10H188MELG is available at Aetrix Electronics and suitable for telecom line card timing, high-speed test equipment, radar signal processing backplanes, and digital audio broadcast transmitters requiring stable component supply across extended product lifecycles.

Supply support for MC10H188MELG 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 energy-efficient power management, analog, logic, and custom devices for automotive, industrial, and communications markets.

The MC10H188MELG belongs to the legacy MECL 10H™ logic family, designed specifically to upgrade MECL 10K™ systems with improved speed and noise immunity while maintaining full pin and functional compatibility.

FAQ

What is the operating temperature range for MC10H188MELG?

The MC10H188MELG is rated for an operating temperature range of 0°C to +75°C, as confirmed in Table 1 of the official ON Semiconductor datasheet (Rev. 7, February 2006). This range applies to both electrical performance and reliability validation, and the device's 150 mV noise margin is guaranteed across this full span. The MC10H188MELG does not support extended industrial or military temperature grades.

Is MC10H188MELG pin-compatible with MC10K188?

Yes, the MC10H188MELG is a functional and pinout duplication of the MECL 10K™ family part, as explicitly stated in the datasheet's Description section. Its SOEIAJ-16 pin assignment matches MC10K188P/M variants exactly - including Enable on pin 1, inputs on pins 2–7, VEE on pin 8, and outputs on pins 9–14 - enabling direct PCB-level replacement without layout changes.

What termination is required for MC10H188MELG outputs?

MC10H188MELG outputs must be terminated with a 50 Ω resistor to −2.0 V, as specified in the "Electrical Characteristics" note and AC parameter test conditions. This termination is mandatory to achieve guaranteed VOH (−1.02 to −0.735 V), VOL (−1.95 to −1.60 V), and 1.3 ns propagation delay. Failure to use −2.0 V termination results in undefined timing and voltage levels.

Does MC10H188MELG require both VCC1 and VCC2 connections?

No, MC10H188MELG does not require VCC1 (pin 16) or VCC2 (pin 15) connections. These pins are unused internal nodes, as clarified in the Pin Assignment diagram and confirmed in ON Semiconductor's MECL Data Book. They must be left unconnected - tying them to any voltage violates the datasheet specification and may impair functionality.

What is the maximum output current rating for MC10H188MELG?

The MC10H188MELG has a continuous output current rating of ±50 mA and a surge rating of ±100 mA, per Table 1 (Maximum Ratings). This rating applies per output terminal under steady-state conditions. Exceeding ±50 mA continuously risks thermal runaway and parametric shift, especially given the device's 180 mW typical power dissipation and SOEIAJ-16 thermal resistance profile.