CD4049UBD Equivalent & Substitute Parts

Part Overview

The CD4049UBD is a 6-channel inverter logic IC manufactured by Texas Instruments in the 4000B series, housed in a 16-SOIC package. This part is discontinued at DiGi Electronics but remains available through inventory stock. The CD4049UBD operates across a wide supply voltage range of 3V to 18V and is designed for general-purpose logic inversion applications requiring low quiescent current and moderate propagation delay characteristics. Due to its discontinued status, equivalent substitute parts from active manufacturers provide functional alternatives while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	CD4049UBD
Manufacturer	Texas Instruments
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)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD4049UBD is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Logic Type: Inverter with 6 channels, 1 input per channel
Package: 16-SOIC form factor (0.154", 3.90mm width)
Voltage Supply Range: Minimum 3V to 18V compatibility
Operating Temperature: -55°C to 125°C range
Mounting Type: Surface Mount
Propagation Delay: 50ns or faster @ 15V, 50pF load
Input Logic Levels: Compatible threshold ranges
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories based on electrical performance alignment:

Group 1 - Direct Electrical Match (Texas Instruments & onsemi): CD4049UBDR, MC14049UBDR2G, MC14049UBDG, NLV14049UBDR2G maintain identical or equivalent output current specifications (4.3mA/24mA or 10mA/40mA) and propagation delay (50ns @ 15V, 50pF).

Group 2 - Compatible with Parameter Variance (Nexperia & onsemi variants): HEF4049BT,653, MC14049BDR2G, MC14049BDG, NLV14049BDR2G, TC4049BF-ELNF operate within the 4000B logic family but exhibit variations in output current drive, propagation delay (40ns to 60ns), or operating temperature ranges that remain functionally compatible for most applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Supply	Current - Output High, Low	Propagation Delay @ 15V, 50pF	Operating Temperature	Package	Product Status
CD4049UBD	Texas Instruments	3V ~ 18V	4.3mA, 24mA	50ns	-55°C ~ 125°C	16-SOIC	Discontinued
CD4049UBDR	Texas Instruments	3V ~ 18V	4.3mA, 24mA	50ns	-55°C ~ 125°C	16-SOIC	Active
MC14049UBDR2G	onsemi	3V ~ 18V	10mA, 40mA	50ns	-55°C ~ 125°C	16-SOIC	Active
HEF4049BT,653	Nexperia USA Inc.	3V ~ 15V	3mA, 20mA	40ns	-40°C ~ 85°C	16-SOIC	Active
MC14049BDG	onsemi	3V ~ 18V	10mA, 40mA	60ns	-55°C ~ 125°C	16-SOIC	Active
MC14049BDR2G	onsemi	3V ~ 18V	10mA, 40mA	60ns	-55°C ~ 125°C	16-SOIC	Active
MC14049UBDG	onsemi	3V ~ 18V	10mA, 40mA	50ns	-55°C ~ 125°C	16-SOIC	Active
NLV14049BDR2G	onsemi	3V ~ 18V	10mA, 40mA	60ns	-55°C ~ 125°C	16-SOIC	Active
NLV14049UBDR2G	onsemi	3V ~ 18V	10mA, 40mA	50ns	-55°C ~ 125°C	16-SOIC	Active
TC4049BF-ELNF	Toshiba Semiconductor and Storage	3V ~ 18V	8mA, 48mA	50ns	-40°C ~ 85°C	16-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation - CD4049UBDR (Texas Instruments): This part provides exact electrical and thermal equivalence to the CD4049UBD with identical output current specifications, propagation delay, and operating temperature range. Product status is Active, ensuring long-term availability. This is the direct replacement when Texas Instruments sourcing is preferred.

Secondary Recommendation - MC14049UBDR2G or MC14049UBDG (onsemi): These onsemi variants maintain the full -55°C to 125°C operating temperature range and 50ns propagation delay matching the original specification. Output current drive is enhanced (10mA/40mA versus 4.3mA/24mA), providing improved noise margin and fan-out capability. Both parts are ROHS3 compliant and carry Active product status.

Alternative Recommendation - NLV14049UBDR2G (onsemi): This low-voltage variant preserves the 50ns propagation delay and full temperature range while offering enhanced output current drive. Packaging is Tape & Reel (TR) format, suitable for high-volume production environments.

Conditional Recommendation - HEF4049BT,653 (Nexperia): This part operates within a reduced temperature range (-40°C to 85°C) and supply voltage range (3V to 15V). Propagation delay is faster at 40ns. Selection is appropriate only when application operating temperatures remain above -40°C and supply voltage does not exceed 15V.

Conditional Recommendation - TC4049BF-ELNF (Toshiba): This part maintains 3V to 18V supply voltage and 50ns propagation delay but operates within -40°C to 85°C temperature range. Output current drive is enhanced (8mA/48mA). Selection is appropriate when temperature range requirements align with -40°C to 85°C specification.

All recommended substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can CD4049UBDR directly replace CD4049UBD in all applications?

A: Yes. CD4049UBDR is the direct active equivalent from Texas Instruments with identical electrical specifications, operating temperature range (-55°C to 125°C), and 16-SOIC package. The only difference is product status (Active versus Discontinued) and packaging format (Cut Tape & Digi-Reel versus Tube).

Q: What is the difference between MC14049UBDR2G and MC14049BDR2G?

A: Both are onsemi parts in the 4000B series with identical electrical specifications. MC14049UBDR2G is packaged in Tape & Reel (TR) format, while MC14049BDR2G is also in Tape & Reel. The primary difference is input logic level thresholds: MC14049UBDR2G matches the original CD4049UBD input levels (1V ~ 2.5V low, 4V ~ 12.5V high), while MC14049BDR2G has slightly different thresholds (1.5V ~ 4V low, 4.6V ~ 11V high).

Q: Is HEF4049BT,653 suitable for applications requiring -55°C operation?

A: No. HEF4049BT,653 operates only to -40°C minimum. If your application requires -55°C operation, select CD4049UBDR, MC14049UBDR2G, MC14049UBDG, NLV14049UBDR2G, or TC4049BF-ELNF instead.

Q: Do all substitute parts fit the same 16-SOIC footprint?

A: Yes. All listed substitutes use the 16-SOIC (0.154", 3.90mm width) package and are pin-compatible for PCB assembly. TC4049BF-ELNF uses a slightly wider 16-SOP package (0.209", 5.30mm width) but maintains the same 16-pin SOIC footprint for electrical connectivity.

Q: Which substitute offers the best output current drive?

A: TC4049BF-ELNF provides the highest output current drive at 8mA (high) and 48mA (low). onsemi variants (MC14049 and NLV14049 series) offer 10mA (high) and 40mA (low). The original CD4049UBD and CD4049UBDR provide 4.3mA (high) and 24mA (low). Higher output current improves noise immunity and fan-out capability.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitutes are ROHS3 compliant. TC4049BF-ELNF is RoHS Compliant (standard designation). All parts carry MSL Level 1 (Unlimited) moisture sensitivity rating.

Q: What packaging formats are available for the CD4049 inverter logic family?

A: Tube (CD4049UBD, MC14049BDG, MC14049UBDG), Cut Tape & Digi-Reel (CD4049UBDR, MC14049UBDR2G, HEF4049BT,653), and Tape & Reel (NLV14049BDR2G, NLV14049UBDR2G, TC4049BF-ELNF). Select packaging based on production volume and assembly process requirements.

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