onsemi MC14049BDR2

Overview

MC14049BDR2 from onsemi is a hex inverting buffer IC built with CMOS P- and N-channel enhancement-mode devices, designed for low-power logic level translation and TTL/DTL interface conversion. It operates from 3.0 V to 18 V, supports input voltages exceeding VDD, delivers ±45 mA output current per pin, and features NC pins at 13 and 16. It is used in industrial control signal conditioning where high noise immunity and single-supply level shifting are required.

For engineers reviewing the MC14049BDR2 datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage range (3–18 V), VIH/VIL thresholds across VDD, sink/source drive capability (IOL ≥ 3.2 mA @ VDD = 5 V), thermal derating behavior, and SOIC-16 package compatibility with legacy 4000-series logic footprints.

Technical Context

The MC14049BDR2 implements six independent CMOS inverter stages in a monolithic structure, each capable of translating logic levels between disparate voltage domains - e.g., converting 12 V sensor signals to 5 V microcontroller inputs. Its input stage accepts VIN up to 18 V regardless of VDD, enabling direct interfacing with higher-voltage analog or discrete logic sources without external clamping.

Each output drives two TTL/DTL loads under standard conditions (VDD = 5.0 V, VOL ≤ 0.4 V, IOL ≥ 3.2 mA), and exhibits propagation delays ranging from 30 ns to 140 ns depending on VDD and load capacitance (CL = 50 pF). Unused inputs must be tied to VSS or VDD; pins 13 and 16 are unconnected internally and must remain floating or unused.

Key Specifications

Pinout & Package

MC14049BDR2 is housed in a Pb-free SOIC-16 package (Case 751B), measuring 9.90 mm × 3.90 mm × 1.37 mm with 1.27 mm pitch. Pins 13 and 16 are not connected internally and must remain unconnected in PCB layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4049UBE, MC14049BDR2 offers extended temperature range (−55 °C to +125 °C), improved ESD tolerance, and automotive qualification readiness; compared with MC14050BDR2G, it provides complementary logic inversion essential for certain interface protocols and reset generation circuits.

Availability

MC14049BDR2 is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control, and power supply sequencing applications requiring stable component supply across long production lifecycles.

Supply support for MC14049BDR2 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MC14049BDR2 belongs to onsemi's legacy CMOS logic product line, engineered for robust interoperability between mixed-voltage systems and long-term reliability in harsh environments.

FAQ

What is the maximum input voltage allowed on MC14049BDR2 pins?

The MC14049BDR2 allows input voltages from −0.5 V to +18.0 V, independent of VDD. This means signals up to 18 V can be applied even when VDD is set to 3 V or 5 V - a key feature enabling direct interfacing with higher-voltage sensors or legacy logic without external clamping diodes or resistive dividers. The MC14049BDR2 input protection circuitry is designed specifically for this overvoltage tolerance.

Can MC14049BDR2 drive TTL loads directly?

Yes, the MC14049BDR2 can drive two standard TTL or DTL loads directly when operated at VDD = 5.0 V, meeting the condition VOL ≤ 0.4 V and IOL ≥ 3.2 mA. This capability is verified across the full operating temperature range and eliminates the need for additional buffer stages in mixed-logic-system interfaces. The MC14049BDR2 achieves this using its high-output-sink-current CMOS architecture.

Are pins 13 and 16 on MC14049BDR2 functional?

No, pins 13 and 16 on the MC14049BDR2 are not connected internally and serve no electrical function. The datasheet explicitly states these terminals are NC (no connect), and connecting them to any net - including ground or VDD - will not affect circuit operation and may introduce noise coupling. The MC14049BDR2 PCB layout should leave both pins unconnected and avoid routing traces or placing vias on them.

What is the quiescent current consumption of MC14049BDR2 at 15 V supply?

At VDD = 15 V and TA = +25 °C, the MC14049BDR2 draws ≤ 4.0 µA of quiescent current per package. This ultra-low static power enables use in always-on monitoring circuits, battery-backed systems, and energy-constrained industrial nodes. The MC14049BDR2 maintains this low IDD across its full −55 °C to +125 °C operating range, with worst-case values still under 120 µA at maximum temperature.

Does MC14049BDR2 support operation at 3.3 V supply voltage?

Yes, the MC14049BDR2 is fully specified to operate at VDD = 3.0 V minimum, making it compatible with 3.3 V systems. At 3.3 V, it delivers guaranteed VOL ≤ 0.4 V and VOH ≥ 3.0 V while sinking ≥ 1.5 mA (IOL) and sourcing ≥ −0.5 mA (IOH), satisfying most 3.3 V logic family interface requirements. The MC14049BDR2 retains its input overvoltage capability (VIN up to 18 V) even at 3.3 V VDD.