BU4081BF-E2 Equivalent & Substitute Parts

Part Overview

The BU4081BF-E2 is a 4-channel AND gate logic IC manufactured by Rohm Semiconductor in 14-SOP surface mount packaging. This part belongs to the 4000B logic series and is classified as "Not For New Designs," indicating it has reached end-of-life status. The part provides four independent 2-input AND gates with supply voltage range of 3V to 16V and maximum quiescent current of 4 µA. Due to its discontinued design status, equivalent substitute parts from active manufacturers are necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	BU4081BF-E2 Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	3V ~ 16V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	1.2mA, 3mA
Input Logic Level - Low	1.5V ~ 4V
Input Logic Level - High	4.6V ~ 11V
Max Propagation Delay @ V, Max CL	50ns @ 15V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the BU4081BF-E2 is determined by the following critical parameters:

Logic Type: AND Gate (4-channel, 2-input configuration)
Voltage Supply Range: Minimum 3V support; upper range must accommodate 16V operation
Input/Output Logic Levels: Must match 1.5V ~ 4V (low) and 4.6V ~ 11V (high) thresholds
Mounting Type: Surface mount only
Package Compatibility: 14-pin SOIC variants with compatible pinout
RoHS3 Compliance: Required for regulatory alignment
MSL Rating: Level 1 (Unlimited) preferred for storage flexibility

The substitute parts identified below meet these core substitution criteria. All candidates maintain the 4-channel, 2-input AND gate architecture and operate within compatible voltage and logic level specifications. Package variations (14-SOIC width differences) are noted but do not prevent functional substitution in standard PCB layouts.

Parameter Comparison

Parameter	BU4081BF-E2 (Rohm)	CD4081BM (TI)	CD4081BM96 (TI)	CD4081BMG4 (TI)	CD4081BMT (TI)	HEF4081BT,653 (Nexperia)	MC14081BDG (onsemi)	MC14081BDR2G (onsemi)
Manufacturer	Rohm Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Nexperia USA Inc.	onsemi	onsemi
Logic Type	AND Gate	AND Gate	AND Gate	AND Gate	AND Gate	AND Gate	AND Gate	AND Gate
Number of Circuits	4	4	4	4	4	4	4	4
Number of Inputs	2	2	2	2	2	2	2	2
Voltage - Supply	3V ~ 16V	3V ~ 18V	3V ~ 18V	3V ~ 18V	3V ~ 18V	3V ~ 15V	3V ~ 18V	3V ~ 18V
Current - Quiescent (Max)	4 µA	1 µA	1 µA	1 µA	1 µA	1 µA	1 µA	1 µA
Current - Output High, Low	1.2mA, 3mA	3.4mA, 3.4mA	3.4mA, 3.4mA	3.4mA, 3.4mA	3.4mA, 3.4mA	3.4mA, 3.4mA	8.8mA, 8.8mA	8.8mA, 8.8mA
Input Logic Level - Low	1.5V ~ 4V	1.5V ~ 4V	1.5V ~ 4V	1.5V ~ 4V	1.5V ~ 4V	1.5V ~ 4V	1.5V ~ 4V	1.5V ~ 4V
Input Logic Level - High	4.6V ~ 11V	4.6V ~ 11V	4.6V ~ 11V	4.6V ~ 11V	4.6V ~ 11V	4.6V ~ 11V	4.6V ~ 11V	4.6V ~ 11V
Max Propagation Delay @ V, Max CL	50ns @ 15V, 50pF	90ns @ 15V, 50pF	90ns @ 15V, 50pF	90ns @ 15V, 50pF	90ns @ 15V, 50pF	40ns @ 15V, 50pF	100ns @ 15V, 50pF	100ns @ 15V, 50pF
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC (0.173", 4.40mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Not For New Designs	Active	Active	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics	Active	Active	Active

Engineering Selection Recommendations

All identified substitute parts maintain functional equivalence to the BU4081BF-E2 across core logic parameters. Selection should prioritize product status and long-term availability:

Recommended Primary Substitutes (Active Status):

CD4081BM and CD4081BM96 (Texas Instruments) are functionally equivalent with extended supply voltage range (3V ~ 18V) and improved operating temperature span (-55°C ~ 125°C). Both maintain ROHS3 compliance and MSL Level 1 rating. CD4081BM96 offers superior inventory availability (15,806 pcs) in Cut Tape & Digi-Reel packaging.

HEF4081BT,653 (Nexperia USA Inc.) provides the fastest propagation delay (40ns @ 15V, 50pF) among all candidates and maintains active product status. Operating temperature range extends to -40°C ~ 125°C with ROHS3 compliance.

MC14081BDR2G (onsemi) offers the highest inventory level (35,200 pcs) in Cut Tape & Digi-Reel packaging with active product status. Output current capability is elevated (8.8mA high/low) compared to the original part, suitable for applications requiring higher drive capability.

Secondary Substitutes (Discontinued Status):

CD4081BMG4 and CD4081BMT (Texas Instruments) are functionally equivalent but marked as discontinued at DiGi Electronics. These parts remain available in limited inventory and are suitable only for maintenance or low-volume legacy applications.

Package Consideration:

The BU4081BF-E2 uses 14-SOIC packaging with 4.40mm width, while all substitute parts use 14-SOIC with 3.90mm width. This dimensional difference requires PCB layout verification to confirm footprint compatibility, though pinout remains identical.

Frequently Asked Questions (FAQ)

Q: Can CD4081BM variants directly replace BU4081BF-E2 without circuit modification?

A: Yes, from a functional logic perspective. All CD4081BM variants (CD4081BM, CD4081BM96, CD4081BMT, CD4081BMG4) maintain identical logic configuration (4-channel, 2-input AND gates) and compatible input/output logic levels. However, PCB footprint verification is required due to package width difference (3.90mm vs. 4.40mm). Output current specifications differ (3.4mA vs. 1.2mA/3mA), which may affect circuit performance in current-limited applications.

Q: What is the primary difference between HEF4081BT,653 and the Texas Instruments CD4081 variants?

A: HEF4081BT,653 (Nexperia) offers superior propagation delay performance (40ns vs. 90ns at 15V, 50pF load) and maintains a narrower supply voltage range (3V ~ 15V vs. 3V ~ 18V). Both are ROHS3 compliant with MSL Level 1 rating. The faster propagation delay makes HEF4081BT,653 suitable for timing-critical applications.

Q: Why do MC14081BDG and MC14081BDR2G show higher output current specifications?

A: onsemi's MC14081 series specifies output current at 8.8mA (high and low) compared to 3.4mA for Texas Instruments variants and 1.2mA/3mA for the original BU4081BF-E2. This represents higher output drive capability, which is beneficial for applications requiring greater fan-out or lower impedance loads. The higher current specification does not prevent substitution but indicates improved drive strength.

Q: Is package width difference (4.40mm vs. 3.90mm) a critical substitution barrier?

A: Package width difference requires PCB footprint verification but is not a functional barrier. Both use 14-SOIC pinout with identical pin spacing. Physical board layout must accommodate the narrower substitute package dimensions. Consult PCB design files and component placement guidelines to confirm compatibility before production implementation.

Q: Which substitute part offers the best long-term availability?

A: MC14081BDR2G (onsemi) demonstrates the highest inventory level (35,200 pcs) and active product status, indicating strong long-term availability. CD4081BM96 (Texas Instruments) provides secondary availability (15,806 pcs) with active status. Both are suitable for applications requiring sustained component supply.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts (CD4081BM series, HEF4081BT,653, MC14081BDG, MC14081BDR2G) carry ROHS3 compliance certification, matching the original BU4081BF-E2 regulatory status.

Q: What operating temperature range should be selected for new designs?

A: For new designs, select parts with extended operating temperature range (-55°C ~ 125°C) such as CD4081BM variants or MC14081 series. These provide superior thermal margin compared to the original BU4081BF-E2 (-40°C ~ 85°C) and HEF4081BT,653 (-40°C ~ 125°C).

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