CD4021
CD4021 is the I-CORE functional equivalent of CD4021B / HEF4021B: 8-bit static shift register, TSSOP-16, 3–15 V, −40 to 125 °C. Factory-original stock in Shenzhen; free samples with shipping paid.
Key specifications
| Manufacturer | I-CORE (Wuxi I-CORE Electronics Co., Ltd.) |
|---|---|
| Part number | CD4021 |
| Function | 8-bit Static Shift Register |
| Package | TSSOP-16 |
| Order codes in stock | CD4021TA16 |
| Supply voltage | 3–15 V |
| Operating temperature | −40 to 125 °C |
| Replaces | CD4021B |
| HEF4021B | |
| Compliance | RoHS (EU 2011/65/EU + 2015/863) and REACH SVHC — third-party lab tested; reports on request |
| Datasheet | PDF, English |
Questions buyers ask
- Can CD4021 replace CD4021B?
- CD4021 is I-CORE's functional equivalent of CD4021B, HEF4021B in the same TSSOP-16 package. Standard parts in this family share the industry pinout, but please compare both datasheets — supply range, timing and absolute maximum ratings — before design-in.
- What is the supply voltage and temperature range of CD4021?
- Supply: 3–15 V. Operating temperature: −40 to 125 °C. See the datasheet for full electrical characteristics.
- Is CD4021 in stock, and can I get a free sample?
- Yes, it is held in stock in Shenzhen. Free samples are available for evaluation, with shipping paid by us. For production orders, SMD parts can be ordered from 1 pc and DIP parts ship in full tubes; orders ship within 2–3 business days after payment.
- Is it original I-CORE product?
- Yes. We supply factory-original I-CORE (Wuxi I-CORE Electronics) parts in sealed reels and tubes. Our ISO 9001, ISO 14001 and ISO 45001 certificates are shown on the home page; RoHS and REACH test reports are available on request.
Datasheet highlights
From the I-CORE English datasheet CD4021-AX-LJ-D038EN (revision 2023-04-B1). The full datasheet PDF is linked above.
General description
The CD4021 is an 8-bit static shift register (parallel-to-serial converter) with a synchronous serial data input (DS), a clock input (CP), an asynchronous active HIGH parallel load input (PL), eight asynchronous parallel data inputs (D0 to D7) and buffered parallel outputs from the last three stages (Q5 to Q7). Each register stage is a D-type master-slave flip-flop with a set direct (SD) and clear direct (CD) input. Information on D0 to D7 is asynchronously loaded into the register while PL is HIGH, independent of CP and DS. When PL is LOW, data on DS is shifted into the first register position and all the data in the register is shifted one position to the right on the LOW-to-HIGH transition of CP. Schmitt trigger action makes the clock input highly tolerant of slower rise and fall times.
Key features
- Tolerant of slower rise and fall times
- Fully static operation
- 5V, 10V, and 15V parametric ratings
- Standardized symmetrical output characteristics
- Specified from -40℃ to +125℃
Request a quote
We reply within 1 business day. Free samples — shipping on us. Tell us the part number, quantity and your application.
Related I-CORE parts
74HC & CD4000 standard logic equivalents → · See all 375 parts →