CD4021BCM Equivalent & Substitute Parts

Part Overview

The CD4021BCM is an 8-stage static shift register manufactured by onsemi in the 4000B logic series. This device functions as a parallel or serial to serial converter with push-pull output configuration, operating across a supply voltage range of 3V to 18V and temperature range of -55°C to 125°C. The CD4021BCM is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Logic Type	Shift Register
Number of Elements	1
Number of Bits per Element	8
Function	Parallel or Serial to Serial
Output Type	Push-Pull
Voltage - Supply	3V ~ 18V
Operating Temperature	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Series	4000B

Substitute Part Grouping Explanation

Substitution eligibility for the CD4021BCM is determined by strict equivalence across the following parameters: logic type (shift register), number of elements (1), number of bits per element (8), function (parallel or serial to serial), output type (push-pull), package type (16-SOIC), and mounting type (surface mount). Supply voltage range and operating temperature range define the operational envelope within which substitutes must function. Parts are grouped into three categories: direct manufacturer equivalents (same base product number with different packaging or qualification), similar parts (alternative manufacturers with identical electrical and mechanical specifications), and parametric equivalents (alternative base product numbers within the same series that maintain functional compatibility).

Parameter Comparison

Part Number	Manufacturer	Voltage - Supply	Operating Temperature	Package	Product Status	RoHS Status
CD4021BCM	onsemi	3V ~ 18V	-55°C ~ 125°C	16-SOIC	Obsolete	Not specified
MC14021BDG	onsemi	3V ~ 18V	-55°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
MC14021BDR2G	onsemi	3V ~ 18V	-55°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
MC14014BDG	onsemi	3V ~ 18V	-55°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
CD4021BM96	Texas Instruments	3V ~ 18V	-55°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
CD4021BMT	Texas Instruments	3V ~ 18V	-55°C ~ 125°C	16-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
CD4021BQDRQ1	Texas Instruments	3V ~ 18V	-40°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
HCF4021YM013TR	STMicroelectronics	3V ~ 20V	-40°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
HEF4021BT,653	Nexperia USA Inc.	3V ~ 15V	-40°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
HEF4021BT-Q100J	Nexperia USA Inc.	3V ~ 15V	-40°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
CD4014BM	Texas Instruments	3V ~ 18V	-55°C ~ 125°C	16-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete CD4021BCM, MC14021BDG and MC14021BDR2G from onsemi provide identical electrical and mechanical specifications with active product status and ROHS3 compliance. These parts maintain the full -55°C to 125°C operating temperature range and 3V to 18V supply voltage range of the original device.

CD4021BM96 from Texas Instruments offers equivalent functionality with active status and ROHS3 compliance, maintaining the original temperature and voltage specifications. This part is available in higher inventory quantities.

CD4021BQDRQ1 from Texas Instruments provides automotive-grade qualification (AEC-Q100) with active status, suitable for applications requiring automotive-level reliability. This part operates across -40°C to 125°C, which is narrower than the original specification.

HCF4021YM013TR from STMicroelectronics offers automotive-grade qualification with extended supply voltage range (3V to 20V) and active product status. Operating temperature range is -40°C to 125°C.

HEF4021BT,653 and HEF4021BT-Q100J from Nexperia USA Inc. provide active product status with ROHS3 compliance. The HEF4021BT-Q100J includes automotive-grade qualification. Both parts operate at -40°C to 125°C with a reduced supply voltage range of 3V to 15V.

CD4014BM from Texas Instruments is a parametric equivalent within the 4000B series, functioning as an alternative 8-stage shift register with identical package and pin configuration. This part is discontinued at DiGi Electronics.

Frequently Asked Questions (FAQ)

Q: Can MC14021BDG directly replace CD4021BCM? A: Yes. MC14021BDG maintains identical electrical specifications (3V to 18V supply, -55°C to 125°C operating range), package type (16-SOIC), and functional characteristics (8-bit shift register, push-pull output). The primary difference is product status: MC14021BDG is active while CD4021BCM is obsolete.

Q: What is the difference between MC14021BDG and MC14021BDR2G? A: Both parts are electrically and functionally identical. The difference is packaging: MC14021BDG is supplied in tube packaging, while MC14021BDR2G is supplied in tape and reel format. Selection depends on procurement and assembly requirements.

Q: Why does HEF4021BT,653 have a lower maximum supply voltage (15V vs 18V)? A: HEF4021BT,653 is specified with a maximum supply voltage of 3V to 15V, which is narrower than the CD4021BCM specification of 3V to 18V. Applications requiring operation above 15V cannot use this substitute without design modification.

Q: Is CD4021BQDRQ1 suitable for non-automotive applications? A: Yes. CD4021BQDRQ1 is automotive-qualified but functions identically to standard industrial-grade shift registers. The AEC-Q100 qualification indicates enhanced reliability testing and is not a limitation for general-purpose use. The operating temperature range is -40°C to 125°C, which is narrower than the original -55°C to 125°C.

Q: What is the difference between CD4014BM and CD4021BCM? A: Both are 8-stage shift registers in the 4000B series with identical package and electrical specifications. CD4014BM is a parametric equivalent with a different base product number. Functional compatibility is maintained across the same electrical and mechanical parameters.

Q: Are all substitute parts ROHS3 compliant? A: All active and recently discontinued substitute parts listed are ROHS3 compliant. The original CD4021BCM does not specify RoHS status. ROHS3 compliance is relevant for applications subject to European Union environmental regulations.

Q: Can I use HCF4021YM013TR in place of CD4021BCM? A: HCF4021YM013TR is functionally compatible with identical package and pin configuration. The supply voltage range extends to 20V (versus 18V maximum for CD4021BCM), and operating temperature is -40°C to 125°C (versus -55°C to 125°C). Applications requiring operation below -40°C cannot use this substitute.

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