CD4049UBCM Equivalent & Substitute Parts

Part Overview

The CD4049UBCM is a 6-channel inverter logic IC manufactured by onsemi in the 4000B series, housed in a 16-SOIC surface mount package. This part operates across a supply voltage range of 3V to 15V with a maximum quiescent current of 4 µA and propagation delay of 35ns at 15V with 50pF load. The CD4049UBCM is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	CD4049UBCM
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Voltage - Supply	3V ~ 15V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	7.2mA, 29mA
Input Logic Level - Low	1V ~ 3V
Input Logic Level - High	4V ~ 12V
Max Propagation Delay @ 15V, 50pF	35ns
Operating Temperature	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CD4049UBCM is determined by the following critical parameters:

Logic function: 6-channel inverter with single input per channel
Package compatibility: 16-SOIC surface mount form factor
Supply voltage range: Minimum 3V operation required
Operating temperature range: -55°C to 125°C
Propagation delay: Maximum 50ns at 15V with 50pF load acceptable
Output drive capability: Minimum 4.3mA high, 24mA low acceptable

Substitute parts are grouped into two categories:

Direct Substitutes (onsemi MC14049 series): Parts with identical logic function, package, and enhanced supply voltage range (3V ~ 18V). These include MC14049UBDG, MC14049BDG, MC14049BDR2G, and MC14049UBDR2G. All maintain the 6-channel inverter configuration and 16-SOIC package with improved electrical specifications.

Compatible Substitutes (Texas Instruments CD4049 variants): Parts with identical base function and package but different manufacturing lineage. These include CD4049UBD, CD4049UBDR, CD4049UBDRE4, CD4049UBDRG4, CD4049UBDT, and CD4049UBDW. All support 3V ~ 18V supply voltage and maintain functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Voltage - Supply	Current - Output High, Low	Input Logic Level - Low	Input Logic Level - High	Max Propagation Delay @ 15V, 50pF	Package	Product Status	RoHS Status
CD4049UBCM	onsemi	3V ~ 15V	7.2mA, 29mA	1V ~ 3V	4V ~ 12V	35ns	16-SOIC	Obsolete	REACH Unaffected
MC14049UBDG	onsemi	3V ~ 18V	10mA, 40mA	1V ~ 2.5V	4V ~ 12.5V	50ns	16-SOIC	Active	ROHS3 Compliant
MC14049BDG	onsemi	3V ~ 18V	10mA, 40mA	1.5V ~ 4V	4.6V ~ 11V	60ns	16-SOIC	Active	ROHS3 Compliant
MC14049BDR2G	onsemi	3V ~ 18V	10mA, 40mA	1.5V ~ 4V	4.6V ~ 11V	60ns	16-SOIC	Active	ROHS3 Compliant
MC14049UBDR2G	onsemi	3V ~ 18V	10mA, 40mA	1V ~ 2.5V	4V ~ 12.5V	50ns	16-SOIC	Active	ROHS3 Compliant
CD4049UBD	Texas Instruments	3V ~ 18V	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns	16-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
CD4049UBDR	Texas Instruments	3V ~ 18V	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns	16-SOIC	Active	ROHS3 Compliant
CD4049UBDRE4	Texas Instruments	3V ~ 18V	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns	16-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
CD4049UBDRG4	Texas Instruments	3V ~ 18V	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns	16-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
CD4049UBDT	Texas Instruments	3V ~ 18V	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns	16-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
CD4049UBDW	Texas Instruments	3V ~ 18V	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns	16-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring the CD4049UBCM, the following selection criteria apply:

Primary Recommendation: MC14049UBDG or MC14049UBDR2G (onsemi). Both parts are active products with ROHS3 compliance and extended supply voltage range (3V ~ 18V). These offer direct functional equivalence with improved output drive capability (10mA, 40mA) and are available in high inventory quantities.

Secondary Recommendation: CD4049UBDR (Texas Instruments). This part is active and ROHS3 compliant with identical logic specifications. It provides functional equivalence with slightly reduced output drive (4.3mA, 24mA) compared to the original CD4049UBCM.

Avoid: CD4049UBDRE4, CD4049UBDRG4, and CD4049UBDT are discontinued at DiGi Electronics and should not be selected for new designs despite technical compatibility.

Packaging Consideration: CD4049UBDW uses a wider 16-SOIC package (0.295" vs 0.154" width) and is suitable only if PCB layout accommodates the larger footprint.

Frequently Asked Questions (FAQ)

Q: Can MC14049UBDG directly replace CD4049UBCM in existing designs?

A: Yes. Both parts are 6-channel inverters in 16-SOIC packages with identical logic function and pin configuration. The MC14049UBDG operates across 3V ~ 18V (vs. 3V ~ 15V for CD4049UBCM) and provides equal or superior electrical performance. No circuit modifications are required.

Q: What is the difference between MC14049UBDG and MC14049BDG?

A: Both are onsemi 6-channel inverters in 16-SOIC packages. MC14049UBDG has input logic levels of 1V ~ 2.5V (low) and 4V ~ 12.5V (high) with 50ns propagation delay. MC14049BDG has input logic levels of 1.5V ~ 4V (low) and 4.6V ~ 11V (high) with 60ns propagation delay. Select MC14049UBDG for tighter input threshold specifications and faster propagation.

Q: Are Texas Instruments CD4049 variants compatible with onsemi MC14049 parts?

A: Yes. All CD4049 and MC14049 variants listed maintain the same 6-channel inverter logic function and 16-SOIC package. Electrical specifications differ slightly in output drive and propagation delay, but functional substitution is valid across manufacturers.

Q: What packaging options are available?

A: Substitute parts are available in Tube (MC14049UBDG, CD4049UBD, CD4049UBDW), Cut Tape with Digi-Reel (MC14049BDR2G, MC14049UBDR2G, CD4049UBDR, CD4049UBDRE4, CD4049UBDRG4, CD4049UBDT), and Tube (MC14049BDG) configurations. Select based on production volume and assembly requirements.

Q: Is the CD4049UBCM still available for purchase?

A: CD4049UBCM is classified as obsolete. Substitute parts with active product status (MC14049UBDG, MC14049UBDR2G, CD4049UBDR, CD4049UBDW) are recommended for new orders and production continuity.

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