CD4050BCSJ Equivalent & Substitute Parts

Part Overview

The CD4050BCSJ is a non-inverting buffer IC manufactured by onsemi, featuring 6 elements with 1 bit per element and push-pull output configuration. This device operates across a 3V to 15V supply range and is housed in a 16-SOP package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	CD4050BCSJ
Manufacturer	onsemi
Logic Type	Buffer, Non-Inverting
Number of Elements	6
Number of Bits per Element	1
Output Type	Push-Pull
Current - Output High, Low	12mA, 40mA
Voltage - Supply	3V ~ 15V
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	16-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CD4050BCSJ is determined by the following critical parameters:

Functional equivalence: Buffer, Non-Inverting logic type with 6 elements, 1 bit per element, push-pull output
Electrical compatibility: Supply voltage range must encompass or exceed 3V ~ 15V; output current ratings must meet or exceed 12mA (high) and 40mA (low)
Package compatibility: 16-pin SOIC/SOP variants with matching pin configurations
Operating temperature range: Must support -55°C ~ 125°C or a subset thereof

Substitute parts are grouped by manufacturer and packaging variant. All listed substitutes maintain the core 4000B series logic architecture and pin-compatible configurations.

Parameter Comparison

Parameter	CD4050BCSJ	CD4050BDR	CD4050BDT	CD4050BDW	CD4050BDWR	CD4050BNSR	HEF4050BT,653	TC4050BF(EL,N,F)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Toshiba Semiconductor and Storage
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	6	6	6	6	6	6	6	6
Number of Bits per Element	1	1	1	1	1	1	1	1
Output Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Current - Output High, Low	12mA, 40mA	8mA, 48mA	8mA, 48mA	8mA, 48mA	8mA, 48mA	8mA, 48mA	3mA, 20mA	8mA, 48mA
Voltage - Supply	3V ~ 15V	3V ~ 18V	3V ~ 18V	3V ~ 18V	3V ~ 18V	3V ~ 18V	3V ~ 15V	3V ~ 18V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-SOIC (0.209", 5.30mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.209", 5.30mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.209", 5.30mm Width)
Product Status	Obsolete	Active	Discontinued at DiGi Electronics	Last Time Buy	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility)

CD4050BDR, CD4050BDWR, and CD4050BNSR are active products from Texas Instruments with extended supply voltage ratings (3V ~ 18V) and full operating temperature range (-55°C ~ 125°C). These parts are ROHS3 compliant and represent the most direct replacements for the obsolete CD4050BCSJ. CD4050BNSR matches the original 16-SOIC (0.209", 5.30mm Width) package footprint.

Secondary Substitutes (Active Status, Temperature or Current Derating)

HEF4050BT,653 from Nexperia USA Inc. and TC4050BF(EL,N,F) from Toshiba are active products with reduced output current ratings (3mA/20mA and 8mA/48mA respectively) and narrower operating temperature ranges (-40°C ~ 85°C). These are suitable for applications where the full -55°C ~ 125°C range is not required and output current demands do not exceed their specifications.

End-of-Life Substitutes (Avoid for New Designs)

CD4050BDT (Discontinued at DiGi Electronics) and CD4050BDW (Last Time Buy) should not be selected for new designs due to their end-of-life status, despite current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can CD4050BDR replace CD4050BCSJ directly?

A: Yes. CD4050BDR is functionally equivalent with matching logic type, element count, and output configuration. It operates across 3V ~ 18V (encompassing the original 3V ~ 15V range) and maintains the full -55°C ~ 125°C temperature range. The package footprint differs slightly (0.154" vs 0.209" width), but pin configuration remains compatible for standard PCB layouts.

Q: What is the difference between CD4050BNSR and CD4050BDR?

A: Both are Texas Instruments products with identical electrical specifications. CD4050BNSR uses a 16-SO package variant (0.209", 5.30mm Width), matching the original CD4050BCSJ footprint more closely. CD4050BDR uses a narrower 16-SOIC package (0.154", 3.90mm Width). Selection depends on PCB layout constraints and package compatibility requirements.

Q: Why do HEF4050BT,653 and TC4050BF(EL,N,F) have lower output current ratings?

A: These parts are from different manufacturers (Nexperia and Toshiba) with different design specifications. HEF4050BT,653 provides 3mA/20mA output current, and TC4050BF(EL,N,F) provides 8mA/48mA. Applications requiring the full 12mA/40mA output capability of the original CD4050BCSJ should use Texas Instruments variants (CD4050BDR, CD4050BDWR, CD4050BNSR).

Q: Is the CD4050BCSJ supply voltage range a limiting factor for substitution?

A: No. All listed substitutes operate at 3V ~ 15V minimum, with most Texas Instruments variants extending to 3V ~ 18V. This expanded range provides additional design flexibility and does not compromise compatibility with circuits designed for the original 3V ~ 15V specification.

Q: Which substitute should be selected for new production designs?

A: CD4050BDWR or CD4050BNSR are recommended for new designs. Both are active products from Texas Instruments with ROHS3 compliance, full operating temperature range (-55°C ~ 125°C), and extended supply voltage ratings (3V ~ 18V). CD4050BNSR is preferred if the original package footprint (0.209", 5.30mm Width) must be maintained.

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