onsemi MC10H188FNR2

Overview

MC10H188FNR2 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 across 0°C to +75°C. It functions as a level-shifting, noise-immune signal fanout device in ECL logic systems requiring precise timing control.

For engineers reviewing the MC10H188FNR2 datasheet, pinout, applications, or equivalent options, this part supports high-frequency data distribution in telecom clock trees, test equipment strobe networks, and digital instrumentation where sub-2 ns timing integrity and MECL 10K compatibility are required.

Technical Context

The MC10H188FNR2 implements six independent non-inverting buffers sharing a single active-low enable input (pin 1), with all outputs forced low when enabled and mirroring inputs when disabled. Its internal design uses voltage-compensated differential emitter-coupled transistors to maintain stable switching thresholds over temperature and supply variation.

It operates exclusively with negative power supplies: VEE = −5.2 V ±5%, VCC1 and VCC2 tied to ground (0 V), enabling direct interfacing with legacy MECL 10K systems without level translation. Output termination requires 50 Ω to −2.0 V for specified AC performance.

Key Specifications

Pinout & Package

MC10H188FNR2 is packaged in a 20-lead plastic leaded chip carrier (PLLC−20, Case 775), surface-mountable with gull-wing leads. Pin 1 is marked by notch or dot; pin 10 is VEE (−5.2 V); pins 1 and 16 are VCC1 and VCC2 (ground); pin 11 is Enable (active-low).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC10H188FNR2, MC100H188FNR2 offers faster timing but demands revised power delivery, while SN65EL188P eliminates negative rails at the cost of board-level redesign and loss of MECL 10K interoperability.

Availability

MC10H188FNR2 is available at Aetrix Electronics and suitable for telecom infrastructure, automated test equipment, radar signal processing, and high-end oscilloscope design requiring stable component supply across long production lifecycles.

Supply support for MC10H188FNR2 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 delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, and communications markets.

The MC10H188FNR2 belongs to the legacy MECL 10H™ logic family, engineered specifically for high-speed, low-jitter signal distribution in ECL-based test, measurement, and telecom systems operating from −5.2 V supplies.

FAQ

What is the correct power supply configuration for MC10H188FNR2?

The MC10H188FNR2 requires a single negative supply: VEE = −5.2 V ±5%, with VCC1 and VCC2 connected to ground (0 V). No positive voltage is needed. The device draws approximately 42–46 mA quiescent current, resulting in ~180 mW typical power dissipation. Incorrect VEE voltage or floating VCC pins will cause undefined output states or excessive current draw in MC10H188FNR2.

Is MC10H188FNR2 pin-compatible with MC10K188 series devices?

Yes, MC10H188FNR2 is a functional and pinout duplication of the MECL 10K™ family part, as explicitly stated in the datasheet. It shares identical pin assignments, logic behavior, and DC/AC specifications with MC10K188 variants in the same PLLC-20 package. This allows direct substitution in existing MC10K188 designs without layout changes, provided the −5.2 V supply is available for MC10H188FNR2.

What termination is required for MC10H188FNR2 outputs to meet AC specifications?

To achieve the specified 1.3 ns propagation delay and 0.7–2.4 ns rise/fall times, MC10H188FNR2 outputs must be terminated with a 50 Ω resistor to −2.0 V. This matches the characteristic impedance of standard 50 Ω transmission lines and establishes the proper DC operating point for MECL logic levels. Failure to use this termination results in signal reflections, degraded timing margins, and invalid AC parameter compliance for MC10H188FNR2.

Does MC10H188FNR2 support operation at temperatures below 0°C?

No, MC10H188FNR2 is characterized and guaranteed only for 0°C to +75°C operation, as defined in Table 1 of the datasheet. While it may function outside this range, parameters such as propagation delay, noise margin, and output voltage swing are not tested or warranted below 0°C. For extended temperature applications, consider MC100H188FNR2, which is rated from −55°C to +125°C and shares the same PLLC-20 footprint as MC10H188FNR2.

How does the enable function operate in MC10H188FNR2?

The MC10H188FNR2 features a single active-low enable input (pin 11). When EN is high (≥ −0.81 V), all six outputs are forced low regardless of input states. When EN is low (≤ −1.07 V), each output mirrors its corresponding input (non-inverting). This behavior is fully differential and maintains MECL logic thresholds throughout - a key feature distinguishing MC10H188FNR2 from TTL or CMOS hex buffers.