CD4043BD Equivalent & Substitute Parts

Part Overview

The CD4043BD is a quad S-R latch logic IC manufactured by Texas Instruments, featuring tri-state output capability in a 16-SOIC surface mount package. This component is classified as discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

The CD4043BD belongs to the 4000B logic series and operates across a wide supply voltage range of 3V to 18V with a propagation delay of 50ns. Its four independent circuits and tri-state output configuration make it suitable for applications requiring latching logic with output control capabilities.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD4043BD
Manufacturer	Texas Instruments
Logic Type	S-R Latch
Circuit Configuration	1:1, 4 Independent Circuits
Output Type	Tri-State
Voltage - Supply	3V ~ 18V
Delay Time - Propagation	50ns
Current - Output High, Low	6.8mA, 6.8mA
Operating Temperature	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Series	4000B
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD4043BD is determined by strict alignment of the following critical parameters:

Core Substitution Criteria:

Logic Type: S-R Latch
Circuit Configuration: 1:1 with 4 Independent Circuits
Output Type: Tri-State
Package / Case: 16-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Series: 4000B

Acceptable Parameter Variations:

Voltage - Supply: Must support the minimum 3V and maximum 18V range, or a subset thereof
Propagation Delay: Variations acceptable if application timing requirements are met
Output Current: Variations acceptable if application current requirements are met
Operating Temperature: Must support the required operating range or a subset thereof
Packaging Format: Cut Tape, Digi-Reel, Tube, or Tape & Reel formats are interchangeable for the same component

Substitutes are grouped into three categories based on their relationship to the CD4043BD:

Direct Manufacturer Equivalents: Same base product number (CD4043) with different packaging formats from the original manufacturer.

Manufacturer Recommended Substitutes: Alternative part numbers from different manufacturers (onsemi, Nexperia) that meet all core substitution criteria with identical or superior electrical specifications.

Parametric Equivalents: Parts with different base product numbers (CD4044) that maintain the same logic type, circuit configuration, and package but may have different internal gate logic (NAND vs. NOR).

Parameter Comparison

Part Number	Manufacturer	Logic Type	Voltage - Supply	Propagation Delay	Output Current (High/Low)	Operating Temperature	Package	Product Status
CD4043BD	Texas Instruments	S-R Latch	3V ~ 18V	50ns	6.8mA / 6.8mA	-55°C ~ 125°C	16-SOIC	Discontinued at DiGi Electronics
CD4043BDR	Texas Instruments	S-R Latch	3V ~ 18V	50ns	6.8mA / 6.8mA	-55°C ~ 125°C	16-SOIC	Active
MC14043BDR2G	onsemi	S-R Latch	3V ~ 18V	60ns	8.8mA / 8.8mA	-55°C ~ 125°C	16-SOIC	Active
HEF4043BT,652	Nexperia USA Inc.	S-R Latch	3V ~ 15V	15ns	3mA / 3mA	-40°C ~ 85°C	16-SOIC	Obsolete
HEF4043BT,653	Nexperia USA Inc.	S-R Latch	3V ~ 15V	15ns	3mA / 3mA	-40°C ~ 85°C	16-SOIC	Active
MC14043BDG	onsemi	S-R Latch	3V ~ 18V	60ns	8.8mA / 8.8mA	-55°C ~ 125°C	16-SOIC	Active
NLV14043BDG	onsemi	S-R Latch	3V ~ 18V	60ns	8.8mA / 8.8mA	-55°C ~ 125°C	16-SOIC	Active
CD4044BD	Texas Instruments	S-R Latch	3V ~ 18V	50ns	6.8mA / 6.8mA	-55°C ~ 125°C	16-SOIC	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Primary Selection - Active Status with Full Compatibility:

CD4043BDR (Texas Instruments) is the direct equivalent with active product status. This part maintains identical electrical specifications to the CD4043BD while offering the advantage of current availability through standard packaging formats (Cut Tape and Digi-Reel).

Secondary Selection - Extended Supply Voltage Range:

MC14043BDR2G and MC14043BDG (onsemi) provide active product status with extended supply voltage range matching the original specification (3V ~ 18V). These parts feature slightly higher propagation delay (60ns vs. 50ns) and increased output current capability (8.8mA vs. 6.8mA), which are acceptable variations for most applications. NLV14043BDG (onsemi) offers identical specifications to the MC14043 variants.

Tertiary Selection - Restricted Operating Range:

HEF4043BT,653 (Nexperia USA Inc.) is available with active product status but operates within a restricted supply voltage range (3V ~ 15V) and narrower operating temperature range (-40°C ~ 85°C). This part is suitable only for applications that do not require the full 18V supply capability or extended low-temperature operation below -40°C. The HEF4043BT,652 variant is obsolete and should not be selected for new designs.

Parametric Alternative - Different Gate Logic:

CD4044BD (Texas Instruments) is a parametric equivalent featuring NAND-based R-S latch logic instead of NOR-based logic. This part maintains identical electrical specifications and package format but requires functional verification due to the different gate logic implementation. This part is discontinued at DiGi Electronics.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory alignment with the original CD4043BD.

Frequently Asked Questions (FAQ)

Q: Can I use CD4043BDR as a direct replacement for CD4043BD?

A: Yes. CD4043BDR is a direct equivalent from Texas Instruments with identical electrical specifications. The only difference is packaging format (Cut Tape/Digi-Reel vs. Tube). Both parts are pin-compatible and functionally equivalent.

Q: What is the difference between CD4043BD and CD4044BD?

A: Both parts are S-R latches in 16-SOIC packages with identical electrical specifications. The functional difference is internal gate logic: CD4043 uses NOR gates while CD4044 uses NAND gates. This affects the logic truth table and input signal requirements. Functional verification is required before substitution.

Q: Can I use MC14043BDR2G or MC14043BDG in place of CD4043BD?

A: Yes, with minor parameter variations. These onsemi parts maintain the same supply voltage range (3V ~ 18V), operating temperature range (-55°C ~ 125°C), and package format. Propagation delay is slightly longer (60ns vs. 50ns) and output current is higher (8.8mA vs. 6.8mA). These variations are acceptable for most applications.

Q: Why should I avoid HEF4043BT,652?

A: HEF4043BT,652 is classified as obsolete. While HEF4043BT,653 (the Tape & Reel variant) is active, the Tube variant (,652) should not be selected for new designs due to discontinued status.

Q: What are the restrictions when using HEF4043BT,653?

A: HEF4043BT,653 operates within a restricted supply voltage range (3V ~ 15V) compared to the CD4043BD (3V ~ 18V). It also has a narrower operating temperature range (-40°C ~ 85°C vs. -55°C ~ 125°C). This part is suitable only for applications that do not require 18V supply operation or extended low-temperature performance below -40°C.

Q: Are all substitute parts available in the same package format?

A: All substitute parts use the 16-SOIC package format. However, packaging options vary: some are supplied in Tube format, others in Cut Tape, Digi-Reel, or Tape & Reel. These packaging formats are interchangeable for the same component and do not affect electrical compatibility.

Q: What compliance certifications do the substitute parts maintain?

A: All substitute parts listed maintain ROHS3 compliance, MSL Level 1 (Unlimited moisture sensitivity), and REACH Unaffected status, matching the original CD4043BD specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message