CD4081BME4 Equivalent & Substitute Parts

Part Overview

The CD4081BME4 is a 4-channel AND gate logic IC manufactured by Texas Instruments in the 4000B CMOS series. This part operates across a wide supply voltage range of 3V to 18V and is housed in a 14-SOIC surface mount package. The CD4081BME4 is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	3V ~ 18V
Current - Quiescent (Max)	1 µA
Current - Output High, Low	3.4mA, 3.4mA
Input Logic Level - Low	1.5V ~ 4V
Input Logic Level - High	4.6V ~ 11V
Max Propagation Delay @ V, Max CL	90ns @ 15V, 50pF
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD4081BME4 is determined by the following critical parameters:

Logic Function: 4-channel AND gate with 2 inputs per channel
Package Type: 14-SOIC surface mount form factor
Supply Voltage Range: 3V to 18V operation
Quiescent Current: Maximum 1 µA
Input/Output Logic Levels: Specified threshold voltages for low and high states
Operating Temperature Range: -55°C to 125°C
Compliance: ROHS3 compliant, MSL Level 1

Substitute parts are grouped into three categories based on their relationship to the original specification:

MFR Recommended Substitutes: Parts from the original manufacturer (Texas Instruments) or alternative manufacturers meeting identical electrical specifications
Direct Manufacturer Alternatives: Parts from alternative manufacturers (onsemi, Nexperia) with equivalent or superior electrical performance
Parametric Equivalents: Parts with matching core functionality but potentially different secondary characteristics (output current, propagation delay)

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Supply	Current - Output High, Low	Max Propagation Delay @ 15V, 50pF	Operating Temperature	Package
CD4081BME4	Texas Instruments	Discontinued at DiGi Electronics	3V ~ 18V	3.4mA, 3.4mA	90ns	-55°C ~ 125°C	14-SOIC
CD4081BM	Texas Instruments	Active	3V ~ 18V	3.4mA, 3.4mA	90ns	-55°C ~ 125°C	14-SOIC
MC14081BDR2G	onsemi	Active	3V ~ 18V	8.8mA, 8.8mA	100ns	-55°C ~ 125°C	14-SOIC
HEF4081BT,653	Nexperia USA Inc.	Active	3V ~ 15V	3.4mA, 3.4mA	40ns	-40°C ~ 125°C	14-SOIC
MC14081BDG	onsemi	Active	3V ~ 18V	8.8mA, 8.8mA	100ns	-55°C ~ 125°C	14-SOIC
NLV14081BDG	onsemi	Obsolete	3V ~ 18V	8.8mA, 8.8mA	100ns	-55°C ~ 125°C	14-SOIC
NLV14081BDR2G	onsemi	Active	3V ~ 18V	8.8mA, 8.8mA	100ns	-55°C ~ 125°C	14-SOIC
CD4081BMG4	Texas Instruments	Discontinued at DiGi Electronics	3V ~ 18V	3.4mA, 3.4mA	90ns	-55°C ~ 125°C	14-SOIC

Engineering Selection Recommendations

Primary Recommendation: CD4081BM (Texas Instruments)

The CD4081BM is the direct active-status equivalent from the original manufacturer. It maintains identical electrical specifications to the CD4081BME4 (3.4mA output current, 90ns propagation delay) while offering active product status and higher inventory availability (4022 units). This part is ROHS3 compliant and MSL Level 1, matching the original specification exactly.

Secondary Recommendation: MC14081BDR2G or MC14081BDG (onsemi)

Both onsemi variants (MC14081BDR2G in Tape & Reel and MC14081BDG in Tube packaging) are active products with full supply voltage range compatibility (3V ~ 18V) and extended temperature range (-55°C ~ 125°C). These parts feature higher output current capability (8.8mA versus 3.4mA), which provides improved drive capability for downstream logic. Propagation delay is slightly higher at 100ns compared to 90ns. Both are ROHS3 compliant and MSL Level 1. Inventory availability is substantial (35200 units for MC14081BDR2G, 7900 units for MC14081BDG).

Alternative Recommendation: HEF4081BT,653 (Nexperia USA Inc.)

The HEF4081BT,653 offers superior propagation delay performance (40ns at 15V, 50pF) and is an active product. However, the maximum supply voltage is limited to 15V compared to 18V for the original part, and the minimum operating temperature is -40°C versus -55°C. This part is suitable for applications where the reduced voltage and temperature ranges are acceptable and faster switching performance is beneficial. Output current matches the original specification at 3.4mA.

Not Recommended: NLV14081BDG

The NLV14081BDG is marked as obsolete and should not be selected for new designs despite meeting electrical specifications.

Not Recommended: CD4081BMG4

The CD4081BMG4 is discontinued at DiGi Electronics and offers no advantage over the active CD4081BM variant.

Frequently Asked Questions (FAQ)

Q: Can I use MC14081BDR2G as a direct replacement for CD4081BME4?

A: Yes, with design considerations. The MC14081BDR2G is electrically compatible across all critical parameters: 4-channel AND gate, 14-SOIC package, 3V ~ 18V supply range, and -55°C ~ 125°C operating temperature. The differences are higher output current (8.8mA vs 3.4mA) and slightly longer propagation delay (100ns vs 90ns). Higher output current is generally beneficial for driving subsequent logic stages. The longer propagation delay is negligible in most applications unless timing margins are extremely tight.

Q: What is the difference between CD4081BM and CD4081BME4?

A: Both parts are from Texas Instruments with identical electrical specifications. The primary difference is product status: CD4081BME4 is discontinued at DiGi Electronics while CD4081BM is active. The CD4081BM is the recommended replacement for the discontinued CD4081BME4.

Q: Why does HEF4081BT,653 have a lower maximum supply voltage (15V vs 18V)?

A: This is a design characteristic of the Nexperia part. While it operates at lower maximum voltage, it offers faster propagation delay (40ns). Applications requiring the full 18V supply range should use CD4081BM, MC14081BDR2G, or MC14081BDG instead.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant and MSL Level 1 (unlimited moisture sensitivity), matching the original CD4081BME4 specification.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in multiple packaging formats: Tube (CD4081BM, MC14081BDG, CD4081BMG4), Cut Tape & Digi-Reel (MC14081BDR2G, HEF4081BT,653), and Tape & Reel (NLV14081BDR2G). Select packaging based on your procurement and assembly requirements.

Q: Can I use NLV14081BDR2G for new designs?

A: No. While NLV14081BDR2G meets electrical specifications, it is an active product from onsemi and is a valid substitute. However, NLV14081BDG (the tube variant) is marked obsolete and should be avoided. For new designs, prioritize active products: CD4081BM, MC14081BDR2G, MC14081BDG, or HEF4081BT,653.

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