onsemi MC10H189MELG

Overview

MC10H189MELG from ON Semiconductor is a hex inverter with common enable, implemented in MECL 10H logic technology. It provides six independent inverting buffers activated when the ENABLE input is low (−1.17 V to −0.84 V), with all outputs forced low when ENABLE is high. Key confirmed specs include 1.3 ns typical propagation delay (data-to-output), −5.2 V VEE supply, and −1.02 V to −0.735 V VOH across 0°C to +75°C operation - used in high-speed timing control for telecom line cards and ECL-based test equipment.

For engineers reviewing the MC10H189MELG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, SOEIAJ-16 package mapping, truth-table–validated logic behavior, and direct alternatives compatible with MECL 10K/10H system interfaces.

Technical Context

The MC10H189MELG implements true ECL differential switching using voltage-compensated internal biasing, ensuring stable VIH/VIL thresholds (−1.17 V/−1.95 V min at 25°C) across temperature. Its enable-controlled output stage drives 50 Ω loads terminated to −2.0 V, delivering matched rise/fall times (0.7–2.4 ns) and noise margin of 150 mV over full operating range.

As a functional and pinout duplicate of MECL 10K parts, it maintains backward compatibility while achieving 100% faster propagation delay without increased supply current - IE remains ≤46 mA at VEE = −5.2 V, enabling drop-in upgrades in legacy ECL systems requiring sub-2 ns timing precision.

Key Specifications

Pinout & Package

MC10H189MELG is packaged in SOEIAJ-16 (Case 966), a 16-pin surface-mount gull-wing package with 0.050″ lead pitch, 7.40–8.20 mm body width, and Pb-free finish (G suffix). Pin 1 is top-left corner, pin 16 bottom-left; VEE is pin 8, VCC1 is pin 1, VCC2 is pin 16.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC10H189MELG, MC100H189FN offers enhanced thermal robustness and drive strength in a larger package, while SN74AS867N trades ECL performance for simpler 5 V integration - neither is pin-compatible, but both serve overlapping functional roles in timing control subsystems.

Availability

MC10H189MELG is available at Aetrix Electronics and suitable for telecom infrastructure, high-speed test instrumentation, radar signal processing, and digital oscilloscope designs requiring stable component supply with guaranteed Pb-free compliance and long-term lifecycle support.

Supply support for MC10H189MELG 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 supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and communications markets.

The MC10H189MELG belongs to ON Semiconductor's legacy MECL 10H logic family, engineered specifically for high-speed, low-jitter digital signal conditioning in ECL-based telecom and test equipment where sub-2 ns timing precision and noise immunity are critical.

FAQ

What is the correct termination scheme for MC10H189MELG outputs?

Each MC10H189MELG output must be terminated with a 50 Ω resistor to −2.0 V DC, as specified in Table 2 and Figure 3 of the datasheet. This termination establishes the proper DC operating point for VOH/VOL compliance and ensures signal integrity on controlled-impedance PCB traces. Failure to use −2.0 V termination results in undefined logic levels and degraded noise margin.

Does MC10H189MELG require external pull-up or pull-down resistors on inputs?

No, MC10H189MELG does not require external pull-up or pull-down resistors. Its ECL inputs are current-mode and self-biasing; VIH and VIL thresholds are internally generated relative to VEE. Inputs left floating will default to indeterminate states - always drive them actively from compatible ECL or properly level-shifted sources.

Can MC10H189MELG operate with VEE = −4.5 V instead of −5.2 V?

No, MC10H189MELG is characterized and guaranteed only at VEE = −5.2 V ±5% (−4.94 V to −5.46 V). Operation at −4.5 V falls outside maximum ratings and violates Table 1's VEE specification of −8.0 V to 0 V *only when VCC = 0*, but dc electrical characteristics in Table 2 assume −5.2 V. Performance degradation and parameter violations will occur outside this range.

Is MC10H189MELG pin-compatible with MC10K189P in PDIP-16?

Yes, MC10H189MELG is functionally and pinout-compatible with MC10K189P, but not physically pin-compatible due to different packages: MC10H189MELG uses SOEIAJ-16 (surface-mount), while MC10K189P uses PDIP-16 (through-hole). The pin functions match exactly (e.g., ENABLE = pin 15, VEE = pin 8), enabling schematic reuse but requiring PCB layout adaptation.

What is the maximum output current rating for MC10H189MELG?

The MC10H189MELG supports continuous output current of ±50 mA per pin, with surge capability up to ±100 mA (Table 1). This rating assumes proper 50 Ω termination to −2.0 V and operation within the 0°C to +75°C ambient range. Exceeding ±50 mA continuously risks thermal overstress and parameter shift.