HEF4021BTTJ
| Parameters | |
|---|---|
| Series | 4000B |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) |
| Mfr | Nexperia USA Inc. |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 125°C |
| Output Type | Push-Pull |
| Number of Elements | 1 |
| Supplier Device Package | 16-TSSOP |
| Number of Bits per Element | 8 |
| Function | Parallel or Serial to Serial |
| Voltage - Supply | 3V ~ 15V |
| Logic Type | Shift Register |
| Package | Tape & Reel (TR) |
| Product Status | Active |
| Base Product Number | HEF4021 |
| REACH Status | REACH Unaffected |
| Standard Package | 2,500 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
HEF4021BTTJ 8-Bit Static Shift Register 1 Element 16-TSSOP
The HEF4021BTTJ, manufactured by Nexperia, is a fully static 8-bit parallel-to-serial shift register belonging to the widely adopted 4000B series of CMOS logic devices. This integrated circuit provides a versatile and robust solution for data acquisition and serialization tasks, converting parallel input data into a serial output stream under clock control. The HEF4021BTTJ is offered in a space-saving 16-lead TSSOP package (SOT403-1), catering to modern surface-mount assembly requirements, with full RoHS compliance and a moisture sensitivity level of 1 (unlimited floor life).
The HEF4021BTTJ finds extensive application across a broad spectrum of digital systems requiring parallel-to-serial data conversion. Typical use cases include keypad and switch matrix scanning, where multiple parallel inputs are serialized to reduce I/O pin count on microcontrollers. It is also widely employed in LED driver expansion, data acquisition front-ends, remote control encoding, industrial automation interfaces, automotive body electronics, and as a general-purpose I/O expander for embedded systems. The device's ability to operate from 3V to 15V makes it ideal for mixed-voltage systems and legacy 5V, 10V, or 15V designs, while its full static operation allows for clock frequencies down to DC, simplifying timing design in low-speed or power-sensitive applications. With Nexperia's Longevity Program ensuring continued product availability, the HEF4021BTTJ represents a dependable and future-proof choice for long-lifecycle projects in consumer, industrial, and automotive segments.
Alternative shift register solutions
1. HEF4021BTT-Q100J – Automotive-qualified (AEC-Q100) version of the HEF4021BTT with identical functionality and pinout for mission-critical automotive applications
2. HEF4021BT,112 – Functionally equivalent 8-bit shift register in SO16 package offering same 3V-to-15V supply range and 40MHz clock frequency for designs requiring wider body packages
3. 74HC165D – 8-bit parallel-in/serial-out shift register from Nexperia with similar functionality but operates at 2V-to-6V supply and faster 80MHz clock for 5V-only systems
4. CD4021BE – 8-bit static shift register from Texas Instruments in 16-pin DIP package offering identical 3V-to-18V operation and pin-compatible parallel-to-serial conversion for through-hole prototyping
