STMicroelectronics HCF4021YM013TR

Overview

HCF4021YM013TR from STMicroelectronics is an 8-stage asynchronous parallel-input/synchronous serial-in/serial-out static shift register in SO-16 package, operating up to 12 MHz (typ.) at 10 V supply, with automotive-grade qualification (AEC-Q100), ±100 nA max input leakage at 18 V, and buffered Q6/Q7/Q8 outputs - used for data serialization and parallel jam loading in engine control units.

For engineers reviewing the HCF4021YM013TR datasheet, HCF4021YM013TR pinout, HCF4021YM013TR application, or HCF4021YM013TR equivalent, this page delivers verified functional behavior, automotive-qualified timing margins, SO-16 thermal and layout constraints, and direct substitution guidance for legacy 4000-series shift register designs.

Technical Context

The HCF4021YM013TR implements eight D-type master-slave flip-flops with independent parallel "jam" inputs per stage and shared clock/parallel-serial control logic. Serial shifting occurs synchronously on the rising clock edge when PARALLEL/SERIAL = LOW; parallel loading is asynchronous but clock-gated, forcing internal stage clocks during jam entry.

It supports wide VDD operation (3–20 V) with guaranteed quiescent current specs up to 20 V, 5/10/15 V parametric ratings, and ESD robustness (CDM 1 kV, HBM 2 kV). Output buffering enables fan-out to multiple CMOS loads without degradation of propagation delay (60–320 ns, depending on VDD).

Key Specifications

Pinout & Package

SO-16 surface-mount package (ECOPACK® compliant), 9.8 mm × 5.8 mm body, 1.27 mm pitch, 1.75 mm max height, with exposed pad not present. Thermal resistance θ_JA ≈ 120 °C/W (JEDEC standard board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit parallel-load/serial-shift register applications.

Compared with CD4021BE and SN74HC165DR, the HCF4021YM013TR uniquely combines automotive qualification, 3–20 V operation, three buffered output taps, and full pin compatibility with legacy 4000-series layouts - making it the sole option for high-reliability, multi-rail, and legacy-upgrade scenarios.

Availability

HCF4021YM013TR is available at Aetrix Electronics and suitable for engine control units, industrial PLC I/O expansion, and automotive body controllers requiring stable component supply across extended temperature and voltage ranges.

Supply support for HCF4021YM013TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and power management applications.

The HCF4021YM013TR belongs to ST's high-voltage, automotive-qualified 4000-series logic family - engineered specifically for robust operation in harsh environments where wide supply range, ESD resilience, and extended temperature stability are mandatory.

FAQ

Is the HCF4021YM013TR pin-compatible with the CD4021BE?

Yes - HCF4021YM013TR uses identical SO-16 pinout and logic behavior as CD4021BE, including PI-1 through PI-8, SERIAL IN, PARALLEL/SERIAL CONTROL, CLOCK, Q6/Q7/Q8, VDD, and VSS assignments. No PCB redesign is needed for drop-in replacement.

What is the minimum setup time for parallel inputs relative to the PARALLEL/SERIAL control signal?

The minimum setup time for parallel inputs (PI-1 to PI-8) relative to the rising edge of the PARALLEL/SERIAL control signal is 20 ns at VDD = 5 V, 10 ns at VDD = 10 V, and 5 ns at VDD = 15 V - specified in Table 7 of the datasheet under "Minimum setup time, parallel inputs".

Can the HCF4021YM013TR drive LED loads directly?

No - its output drivers are rated for ±1.36 mA (IOH/IOL at VDD = 5 V), insufficient for typical LED forward currents (5–20 mA). It requires external transistor or buffer drivers for LED interfacing; however, it can reliably drive CMOS inputs or small capacitive loads up to 50 pF.

Does the HCF4021YM013TR support cascading with other shift registers?

Yes - Q8 output can be connected to SERIAL IN of a second HCF4021YM013TR to form a 16-bit (or longer) shift chain. The device's propagation delay and transition time specs ensure timing integrity across cascaded stages when CL ≤ 50 pF and RL = 200 kΩ, as validated in the test circuit (Figure 4).