onsemi MC14081BFR1

Overview

MC14081BFR1 from onsemi is a quad 2-input AND gate CMOS logic IC designed for low-power, high-noise-immunity digital signal processing in industrial and embedded systems. It operates across 3.0–18 VDC supply, delivers ±10 mA output drive per pin, features triple diode input protection, and is pin-for-pin compatible with CD4081B. It is used in discrete logic control circuits such as power sequencers and sensor interface enable gates.

For engineers reviewing the MC14081BFR1 datasheet, pinout, applications, or equivalent options, key selection considerations include its wide VDD range (3–18 V), guaranteed noise margins (1.0 V at 5 V, 2.5 V at 15 V), buffered outputs, and compatibility with legacy CD4000-series designs requiring quad AND functionality.

Technical Context

The MC14081BFR1 implements four independent 2-input AND gates using complementary MOS (CMOS) P- and N-channel enhancement-mode transistors in a monolithic structure. Each gate provides non-inverting logic output with rail-to-rail voltage swing and exhibits defined DC noise margins - 1.0 V at 5 V supply, 2.5 V at 15 V supply - ensuring robust operation in electrically noisy environments.

It supports dynamic operation up to 3 MHz typical (CL = 50 pF, VDD = 15 V), with propagation delays ranging from 40 ns (typ, VDD = 15 V) to 200 ns (max, VDD = 5 V). Input thresholds scale with supply voltage: VIH = 3.5 V min at VDD = 5 V, VIH = 11 V min at VDD = 15 V; VIL = 1.5 V max at VDD = 5 V, VIL = 4.0 V max at VDD = 15 V.

Key Specifications

Pinout & Package

EIAJ SOIC-14 package (Case 965-01), 14-pin surface-mount, body size 9.90 × 5.45 mm, 1.27 mm pitch, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input AND gate applications.

Compared with CD4081BM96, MC14081BFR1 offers superior noise immunity and lower static power; compared with 74HC08DR, it trades speed for broader supply flexibility and ruggedized input protection - making it optimal for industrial control where voltage variation and ESD risk dominate timing constraints.

Availability

MC14081BFR1 is available at Aetrix Electronics and suitable for industrial power sequencing, legacy system logic upgrades, and sensor interface enable applications requiring stable component supply across extended temperature and voltage ranges.

Supply support for MC14081BFR1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The MC14081BFR1 belongs to the B-Series CMOS logic family, engineered for low-power, high-noise-immunity digital control in harsh environments - targeting industrial automation, instrumentation, and legacy system modernization.

FAQ

What is the maximum supply voltage rating for MC14081BFR1?

The absolute maximum DC supply voltage (VDD) for MC14081BFR1 is +18.0 V, with a recommended operating range of 3.0 V to 18 V. Exceeding 18.0 V risks permanent damage. The device's electrical characteristics - including VOH, VOL, and propagation delay - are specified across this full range, enabling use in 5 V, 12 V, and 15 V systems without external regulation. Always observe derating above 65°C per datasheet thermal guidelines.

Does MC14081BFR1 require pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of MC14081BFR1 must be tied to VDD (not left floating), as it is an AND gate. Floating CMOS inputs cause increased quiescent current, potential oscillation, and excessive power dissipation due to undefined transistor conduction states. A direct connection to VDD is preferred; if routing constraints require a resistor, a 10 kΩ pull-up is acceptable but adds unnecessary node capacitance and power path complexity.

Is MC14081BFR1 pin-compatible with CD4081B?

Yes - MC14081BFR1 is explicitly specified as a pin-for-pin replacement for CD4081B. Both devices use identical SOIC-14 (EIAJ) pin assignments: VDD on pin 14, VSS on pin 7, and matching input/output mapping across pins 1–6 and 8–13. This allows direct substitution in existing CD4081B-based designs without PCB modification, while delivering improved noise margin and lower quiescent current.

What is the output drive capability of MC14081BFR1 at 12 V supply?

At VDD = 12 V, MC14081BFR1 guarantees ±1.3 mA output sink (IOL) and ±0.51 mA output source (IOH) current per pin, measured at VOH = 9.5 V and VOL = 1.5 V respectively. These values meet the requirement to drive two low-power TTL loads or one low-power Schottky TTL load across –55°C to +125°C. Output voltage swing remains rail-to-rail (0 V to 12 V), supporting unambiguous logic level interpretation in mixed-voltage systems.

How does the triple diode protection on MC14081BFR1 improve system reliability?

The triple diode protection on MC14081BFR1 input pins provides enhanced ESD robustness beyond standard double-diode schemes - specifically rated to withstand human-body-model (HBM) discharges exceeding 2 kV. This reduces failure rates during board handling, connector mating, and field maintenance in industrial settings. Unlike unprotected or minimally protected logic, MC14081BFR1 maintains functional integrity after repeated electrostatic events, lowering warranty claims and field return rates in factory automation and test equipment.