CD4043BDWR Equivalent & Substitute Parts

Part Overview

The CD4043BDWR is a quad S-R latch with tri-state output logic integrated circuit manufactured by Texas Instruments. This device operates across a wide supply voltage range of 3V to 18V and is housed in a 16-SOIC surface mount package. The part is currently in active production status with 951 units in stock inventory.

Substitute parts become necessary when the CD4043BDWR reaches end-of-life status, when supply constraints occur, or when design requirements necessitate alternative packaging or performance characteristics. The HEF4043BT series from Nexperia USA Inc. provides functional equivalence with specific parameter variations that must be evaluated for application compatibility.

Key Parameters

Parameter	CD4043BDWR
Logic Type	S-R Latch
Circuit Configuration	1:1 (4 Independent Circuits)
Output Type	Tri-State
Voltage Supply Range	3V ~ 18V
Propagation Delay	50ns
Output Current (High/Low)	6.8mA / 6.8mA
Operating Temperature	-55°C ~ 125°C
Package Type	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Active
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CD4043BDWR is determined by the following critical parameters:

Logic type and circuit configuration (S-R Latch, 1:1, 4 independent circuits)
Output type (Tri-State)
Minimum supply voltage compatibility (3V minimum required)
Package type (16-SOIC surface mount)
Tri-state output capability and current drive specifications

The HEF4043BT series meets the core functional requirements of S-R latch logic with tri-state outputs in 16-SOIC packaging. However, the HEF4043BT variants operate within a reduced supply voltage range (3V ~ 15V maximum versus 3V ~ 18V for the CD4043BDWR) and exhibit different propagation delay and output current characteristics. These differences must be evaluated against specific application requirements.

Parameter Comparison

Parameter	CD4043BDWR	HEF4043BT,652	HEF4043BT,653
Manufacturer	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.
Logic Type	S-R Latch	S-R Latch	S-R Latch
Circuit Configuration	1:1 (4 Circuits)	1:1 (4 Circuits)	1:1 (4 Circuits)
Output Type	Tri-State	Tri-State	Tri-State
Voltage Supply Range	3V ~ 18V	3V ~ 15V	3V ~ 15V
Propagation Delay	50ns	15ns	15ns
Output Current (High/Low)	6.8mA / 6.8mA	3mA / 3mA	3mA / 3mA
Operating Temperature	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	16-SOIC (0.295", 7.50mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)
Packaging Format	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Product Status	Active	Obsolete	Active
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

HEF4043BT,653 is the preferred substitute when CD4043BDWR availability is constrained. This part maintains active production status, is available in Tape & Reel packaging suitable for automated assembly, and carries ROHS3 compliance certification. The 15ns propagation delay provides faster switching performance than the original 50ns specification.

HEF4043BT,652 is not recommended for new designs due to obsolete product status, despite functional equivalence. This part is available only in Tube packaging, which is unsuitable for high-volume automated manufacturing processes.

Applications requiring supply voltages exceeding 15V cannot use either HEF4043BT variant, as the maximum supply rating is 3V ~ 15V compared to the CD4043BDWR maximum of 18V. Applications requiring output currents exceeding 3mA per channel must verify that the reduced current drive of the HEF4043BT series (3mA versus 6.8mA) meets load requirements.

Frequently Asked Questions (FAQ)

Q: Can HEF4043BT,653 be used as a direct replacement for CD4043BDWR in all applications?

A: HEF4043BT,653 is functionally equivalent for logic operation but has parameter differences. The maximum supply voltage is limited to 15V (versus 18V for CD4043BDWR), and output current drive is reduced to 3mA per channel (versus 6.8mA). Verify that your application does not exceed these limits.

Q: What is the difference between HEF4043BT,652 and HEF4043BT,653?

A: Both parts are electrically identical with the same logic specifications, propagation delay, and output current. The primary difference is packaging format: HEF4043BT,652 is supplied in Tube packaging, while HEF4043BT,653 is supplied in Tape & Reel format. HEF4043BT,653 is also in active production status, whereas HEF4043BT,652 is obsolete.

Q: Are the 16-SOIC packages physically compatible between CD4043BDWR and HEF4043BT variants?

A: Both use 16-SOIC surface mount packages, but physical dimensions differ. CD4043BDWR uses 16-SOIC (0.295", 7.50mm width), while HEF4043BT uses 16-SOIC (0.154", 3.90mm width). PCB footprints must be verified for compatibility before substitution.

Q: What is the impact of the 15ns propagation delay in HEF4043BT versus 50ns in CD4043BDWR?

A: The HEF4043BT exhibits faster switching response. For most latch applications, this faster performance is beneficial and does not create compatibility issues. However, applications with timing-dependent circuits should verify that the faster response does not affect system behavior.

Q: Can I use HEF4043BT,653 in applications operating at 18V supply voltage?

A: No. HEF4043BT,653 is rated for maximum 15V supply voltage. Applications requiring 15V to 18V operation must continue using CD4043BDWR or identify alternative parts rated for this voltage range.

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