onsemi MC10121P

Overview

MC10121P from ON Semiconductor is a MECL 10,000-series 4-wide OR-AND/OR-AND-Invert logic gate providing simultaneous dual-output combinational logic in high-speed digital control and multiplexing circuits. It operates with V_EE = –5.2 V, delivers t_pd = 2.3 ns typical propagation delay, t_r/t_f = 2.5 ns (20–80%), and dissipates P_D = 100 mW typical per package under no-load conditions.

For engineers reviewing the MC10121P datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, validated PDIP-16 pin mapping, confirmed MECL 10K-level timing and voltage thresholds, and direct alternative options for high-speed logic replacement in telecom switching and test equipment designs.

Technical Context

The MC10121P implements two independent 4-input OR-AND gates with complementary outputs (AOUT and AOUT), each performing OR–AND logic followed by inversion on one output path. Its internal structure uses emitter-coupled transistors biased at –5.2 V V_EE, with V_CC1 and V_CC2 tied to ground reference for proper MECL level translation.

It supports full MECL 10,000-series DC specifications across –30°C to +85°C, including I_inH ≤ 495 µA, I_inL ≤ 0.5 µA, VOH = –0.890 V (typ), VOL = –1.675 V (typ), and threshold voltages VOHA = –0.980 V and VOLA = –1.630 V at +25°C - all measured into 50 Ω loads terminated to –2.0 V.

Key Specifications

Pinout & Package

MC10121P is supplied in a 16-pin plastic dual-in-line package (PDIP-16), case 648–08, with 0.300-inch row spacing and through-hole mounting. Pin 1 is V_CC1, Pin 16 is V_CC2, and Pin 8 is V_EE. All inputs and outputs are arranged to support compact PCB layout for multi-gate logic clusters.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed OR-AND logic applications.

Compared with MC10121L and MC10121FN, the MC10121P provides identical logic functionality and timing performance in a lower-cost, industry-standard through-hole package optimized for prototyping and medium-volume industrial control boards.

Availability

MC10121P is available at Aetrix Electronics and suitable for digital multiplexing, high-speed address decoding, bit-slice logic expansion, and ECL-compatible signal routing requiring stable component supply and long-term obsolescence management.

Supply support for MC10121P 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 (formerly part of Motorola Semiconductor) is a global supplier of high-performance silicon solutions for automotive, industrial, cloud computing, and communications markets.

The MC10121P belongs to the legacy MECL 10,000-series logic family, designed specifically for high-speed digital systems requiring sub-3 ns propagation delays and robust noise immunity in telecom infrastructure and test instrumentation.

FAQ

What logic function does the MC10121P implement?

The MC10121P implements two independent 4-wide OR-AND/OR-AND-Invert logic gates. Each gate accepts four A-inputs and four B-inputs, performs OR operations on both groups, then ANDs the results - delivering both true and inverted outputs. This structure supports fast combinational logic in data routing and control path applications without programmable logic.

What power supply configuration is required for the MC10121P?

The MC10121P requires a single negative supply: V_EE = –5.2 V applied to Pin 8. Pins 1 (V_CC1) and 16 (V_CC2) must be connected to system ground. No positive supply is used. This configuration aligns with standard MECL 10,000-series biasing and ensures correct logic threshold referencing.

Is the MC10121P pin-compatible with other packages in the same family?

No - the MC10121P (PDIP-16) has a different pinout than the MC10121FN (PLCC-20) and MC10121L (CDIP-16). While all three share identical logic functionality and electrical specs, the PLCC version requires pin conversion per ON Semiconductor's DL122/D data book, and the ceramic DIP uses distinct terminal numbering. Direct PCB substitution is not possible.

What is the maximum operating temperature for the MC10121P?

The MC10121P is characterized and guaranteed over an operating temperature range of –30°C to +85°C. Electrical parameters including propagation delay, output voltage levels, and input currents are fully specified at these extremes per the Rev. 7 datasheet. Operation outside this range may result in undefined behavior or parametric shift.

How does the MC10121P handle input termination and load driving?

The MC10121P is designed to drive 50 Ω loads terminated to –2.0 V, as specified in its switching time tests. Inputs exhibit low current draw (I_inH ≤ 495 µA, I_inL ≤ 0.5 µA), minimizing loading on upstream sources. For reliable operation, inputs should be actively driven - unterminated or floating inputs are not permitted due to MECL's sensitivity to bias conditions.