onsemi MC10H189M

Overview

MC10H189M from ON Semiconductor is a MECL 10H™ hex inverter with common enable, operating at −5.2 V VEE supply, delivering 1.3 ns typical propagation delay (data-to-output), −1.02 V to −0.735 V VOH across temperature, and 180 mW typical power dissipation per package-used in high-speed ECL logic systems requiring precise timing control and noise-immune signal inversion.

For engineers reviewing the MC10H189M datasheet, pinout, applications, or equivalent options, this device is selected for ECL-based clock distribution, bus interface logic, and high-speed test equipment where sub-2 ns propagation and voltage-compensated output stability are critical design requirements.

Technical Context

The MC10H189M implements six independent inverting buffers sharing a single active-low Enable input; outputs go low when Enable is high, and invert inputs when Enable is low. It operates exclusively in negative-supply ECL mode with VEE = −5.2 V ±5% and dual VCC pins (VCC1, VCC2) tied to ground.

All inputs and outputs are compatible with MECL 10K logic levels, featuring voltage-compensated internal biasing to maintain stable VIH/VIL thresholds (−1.17 V to −0.735 V) and VOH/VOL (−1.02 V to −0.735 V / −1.95 V to −1.60 V) over 0°C to +75°C.

Key Specifications

Pinout & Package

MC10H189M uses a 16-pin SOEIAJ (Small Outline EIAJ) plastic package (Case 966), 7.40 mm × 8.20 mm body size, 1.27 mm pitch, gull-wing leads, Pb-free option available (MC10H189MG).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC10H189P and MC10H189FN, the MC10H189M offers optimal balance of surface-mount manufacturability, thermal performance (θJA ≈ 50°C/W), and direct compatibility with modern SOIC-reflow processes - making it the preferred choice for volume production of high-speed ECL subsystems.

Availability

MC10H189M is available at Aetrix Electronics and suitable for digital test equipment, high-speed data acquisition systems, telecom line card timing, and industrial PLC backplane logic requiring stable component supply across extended product lifecycles.

Supply support for MC10H189M 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 management, analog, logic, and custom devices for automotive, industrial, cloud, and consumer markets.

The MC10H189M belongs to the legacy MECL 10H logic family, designed specifically for high-speed, low-jitter digital systems where ECL's inherent speed and noise immunity outweigh CMOS power advantages.

FAQ

What is the recommended termination for MC10H189M outputs?

The MC10H189M 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 ensures proper impedance matching in high-speed ECL transmission lines and maintains the −1.95 V to −1.60 V VOL range. Failure to use this exact termination will result in degraded timing performance and potential logic errors in the MC10H189M circuit operation.

Does MC10H189M support mixed-voltage interfacing with TTL or CMOS logic?

No, the MC10H189M is strictly a negative-supply ECL device operating at VEE = −5.2 V and referenced to ground (VCC1/VCC2 = 0 V). Its input thresholds (VIH/VIL) and output swings (VOH/VOL) are incompatible with TTL or CMOS voltage levels. Interfacing requires dedicated ECL–TTL translators such as the MC10H109 or level-shifting networks - the MC10H189M itself cannot directly drive or accept TTL/CMOS signals.

What is the function of pins 15 and 16 (VCC1 and VCC2) on the MC10H189M?

Pins 15 (VCC1) and 16 (VCC2) on the MC10H189M are both ground reference connections for internal bias circuitry - they are not power supply inputs. Both must be tied directly to system ground with low-inductance paths. Separating these pins reduces ground-bounce coupling between internal logic sections, preserving noise margin. Leaving either unconnected will cause incorrect biasing and functional failure of the MC10H189M.

Is MC10H189M pin-compatible with the older MC10189 series?

Yes, the MC10H189M is a functional and pinout duplication of the MECL 10K MC10189 series, as confirmed in the datasheet: "This MECL 10H™ part is a functional/pinout duplication of the standard MECL 10K™ family part." All 16 pins match in function and location between MC10H189M and MC10189P/L, enabling direct replacement without PCB modification - though the MC10H189M delivers improved propagation delay and noise margin.

What is the maximum allowable VEE voltage range for reliable operation of MC10H189M?

The MC10H189M is rated for VEE = −8.0 V to 0 V absolute maximum, but its specified electrical characteristics apply only within −5.2 V ±5% (i.e., −5.46 V to −4.94 V). Operation outside this range may cause parametric shift, increased power dissipation, or latch-up. For stable MC10H189M functionality in production systems, maintain VEE regulation within ±5% tolerance using a precision negative regulator or filtered supply.