CD4049UBDT Equivalent & Substitute Parts

Part Overview

The CD4049UBDT is a 6-channel inverter logic IC manufactured by Texas Instruments in the 4000B series. This part is currently discontinued at DiGi Electronics. The CD4049UBDT operates across a wide supply voltage range of 3V to 18V and is housed in a 16-SOIC surface mount package. Due to its discontinued status, equivalent substitute parts from Texas Instruments and alternative manufacturers are available to maintain design continuity and ensure supply chain reliability.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Voltage - Supply	3V ~ 18V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	4.3mA, 24mA
Input Logic Level - Low	1V ~ 2.5V
Input Logic Level - High	4V ~ 12.5V
Max Propagation Delay @ V, Max CL	50ns @ 15V, 50pF
Operating Temperature	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD4049UBDT is determined by the following critical parameters: logic type (inverter), circuit count (6 channels), input count (1 per channel), package type (16-SOIC), and electrical performance specifications including supply voltage range, quiescent current, output current drive capability, input logic thresholds, and propagation delay.

Substitute parts are grouped into three categories:

Parametric Equivalents (Texas Instruments): CD4049UBDR, CD4049UBDRE4, and CD4049UBDRG4 maintain identical electrical specifications to the CD4049UBDT across all critical parameters. These parts differ only in product status or packaging configuration.

Direct Manufacturer Equivalent (onsemi): MC14049UBDR2G is manufactured by onsemi and shares the same base product functionality. This part maintains the same supply voltage range, operating temperature, and package type. Output current specifications differ (10mA, 40mA versus 4.3mA, 24mA), representing higher drive capability.

Manufacturer Recommended Alternatives: HEF4049BT,653 (Nexperia), MC14049BDG, MC14049BDR2G, MC14049UBDG (onsemi), NLV14049BDR2G, and NLV14049UBDR2G represent functionally equivalent inverter ICs with variations in electrical performance, operating temperature ranges, or packaging formats. These parts maintain the 6-channel inverter architecture and 16-SOIC package footprint but may exhibit differences in quiescent current, output drive capability, input logic thresholds, or propagation delay.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Supply	Current - Quiescent (Max)	Current - Output High, Low	Input Logic Level - Low	Input Logic Level - High	Max Propagation Delay @ V, Max CL	Operating Temperature	Packaging
CD4049UBDT	Texas Instruments	Discontinued at DiGi Electronics	3V ~ 18V	4 µA	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns @ 15V, 50pF	-55°C ~ 125°C	Cut Tape (CT) & Digi-Reel®
CD4049UBDR	Texas Instruments	Active	3V ~ 18V	4 µA	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns @ 15V, 50pF	-55°C ~ 125°C	Cut Tape (CT) & Digi-Reel®
CD4049UBDRE4	Texas Instruments	Discontinued at DiGi Electronics	3V ~ 18V	4 µA	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns @ 15V, 50pF	-55°C ~ 125°C	Cut Tape (CT) & Digi-Reel®
CD4049UBDRG4	Texas Instruments	Discontinued at DiGi Electronics	3V ~ 18V	4 µA	4.3mA, 24mA	1V ~ 2.5V	4V ~ 12.5V	50ns @ 15V, 50pF	-55°C ~ 125°C	Cut Tape (CT) & Digi-Reel®
MC14049UBDR2G	onsemi	Active	3V ~ 18V	4 µA	10mA, 40mA	1V ~ 2.5V	4V ~ 12.5V	50ns @ 15V, 50pF	-55°C ~ 125°C	Cut Tape (CT) & Digi-Reel®
HEF4049BT,653	Nexperia USA Inc.	Active	3V ~ 15V	16 µA	3mA, 20mA	1.5V ~ 4V	4.6V ~ 11V	40ns @ 15V, 50pF	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®
MC14049BDG	onsemi	Active	3V ~ 18V	4 µA	10mA, 40mA	1.5V ~ 4V	4.6V ~ 11V	60ns @ 15V, 50pF	-55°C ~ 125°C	Tube
MC14049BDR2G	onsemi	Active	3V ~ 18V	4 µA	10mA, 40mA	1.5V ~ 4V	4.6V ~ 11V	60ns @ 15V, 50pF	-55°C ~ 125°C	Cut Tape (CT) & Digi-Reel®
MC14049UBDG	onsemi	Active	3V ~ 18V	4 µA	10mA, 40mA	1V ~ 2.5V	4V ~ 12.5V	50ns @ 15V, 50pF	-55°C ~ 125°C	Tube
NLV14049BDR2G	onsemi	Active	3V ~ 18V	4 µA	10mA, 40mA	1.5V ~ 4V	4.6V ~ 11V	60ns @ 15V, 50pF	-55°C ~ 125°C	Tape & Reel (TR)
NLV14049UBDR2G	onsemi	Active	3V ~ 18V	4 µA	10mA, 40mA	1V ~ 2.5V	4V ~ 12.5V	50ns @ 15V, 50pF	-55°C ~ 125°C	Tape & Reel (TR)

Engineering Selection Recommendations

First Priority - Direct Replacement: CD4049UBDR from Texas Instruments is the recommended substitute. This part is active in production, maintains identical electrical specifications to the CD4049UBDT, and is available in the same Cut Tape & Digi-Reel® packaging format with 17,289 units in stock.

Secondary Option - onsemi Equivalents: MC14049UBDR2G and MC14049UBDG from onsemi provide functional equivalence with identical input logic thresholds and propagation delay characteristics. These parts feature higher output current drive capability (10mA, 40mA versus 4.3mA, 24mA), which is beneficial for applications requiring increased fan-out. Both are active products with substantial inventory availability.

Alternative for Extended Temperature Range: MC14049BDR2G and NLV14049BDR2G maintain the full -55°C to 125°C operating temperature range. These parts are suitable for applications requiring the extended temperature specification of the original CD4049UBDT.

Restricted Use - Nexperia HEF4049BT,653: This part operates within a reduced supply voltage range (3V ~ 15V versus 3V ~ 18V) and narrower operating temperature range (-40°C ~ 85°C). Selection of this part requires verification that the application does not exceed these electrical and thermal boundaries.

All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's compliance profile.

Frequently Asked Questions (FAQ)

Q: Can CD4049UBDR be used as a direct replacement for CD4049UBDT?

A: Yes. CD4049UBDR is electrically and functionally identical to CD4049UBDT. Both parts share the same supply voltage range (3V ~ 18V), quiescent current (4 µA), output current specifications (4.3mA, 24mA), input logic thresholds, propagation delay, and operating temperature range (-55°C ~ 125°C). The primary difference is product status: CD4049UBDR is active in production while CD4049UBDT is discontinued.

Q: What is the difference between Texas Instruments CD4049 variants and onsemi MC14049 variants?

A: Both manufacturers produce functionally equivalent 6-channel inverter ICs in the 4000B logic family. Texas Instruments CD4049 parts and onsemi MC14049/NLV14049 parts share the same logic architecture and package footprint. Key differences include output current drive capability (onsemi parts typically offer 10mA, 40mA versus Texas Instruments 4.3mA, 24mA) and input logic threshold specifications. Selection depends on application requirements for output drive current and input signal thresholds.

Q: Are there packaging format differences among the substitute parts?

A: Yes. CD4049UBDR, CD4049UBDRE4, CD4049UBDRG4, MC14049UBDR2G, and HEF4049BT,653 are supplied in Cut Tape (CT) & Digi-Reel® format. MC14049BDG, MC14049UBDG are supplied in Tube format. NLV14049BDR2G and NLV14049UBDR2G are supplied in Tape & Reel (TR) format. All parts use the same 16-SOIC (0.154", 3.90mm Width) package footprint and are compatible with standard surface mount assembly processes.

Q: Can HEF4049BT,653 be used in all applications where CD4049UBDT is specified?

A: No. HEF4049BT,653 operates within a reduced supply voltage range (3V ~ 15V) and narrower operating temperature range (-40°C ~ 85°C) compared to CD4049UBDT (3V ~ 18V, -55°C ~ 125°C). This part is suitable only for applications that do not require operation above 15V supply voltage or below -40°C or above 85°C ambient temperature.

Q: What is the significance of the input logic level differences between substitute parts?

A: Input logic level specifications define the voltage thresholds at which the inverter recognizes a logic low or high state. CD4049UBDT specifies 1V ~ 2.5V for low and 4V ~ 12.5V for high. Some substitute parts (MC14049BDG, MC14049BDR2G, NLV14049BDR2G, HEF4049BT,653) specify 1.5V ~ 4V for low and 4.6V ~ 11V for high. These differences affect compatibility with specific signal sources and may require circuit verification in noise-sensitive applications.

Q: Do all substitute parts meet the same compliance standards as CD4049UBDT?

A: Yes. All listed substitute parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and are REACH unaffected. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001, matching the original part's regulatory and compliance profile.

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