NXP Semiconductors HEF4021BP-Q100U

Overview

HEF4021BP-Q100 from Nexperia is an automotive-qualified 8-bit static shift register (parallel-to-serial converter) with asynchronous parallel load (PL), synchronous serial data input (DS), and LOW-to-HIGH edge-triggered clock (CP). It features buffered Q5–Q7 outputs, Schmitt-trigger clock input for noise immunity, and operates from 3 V to 15 V supply across -40 °C to +125 °C - used in automotive body control modules for LED driver sequencing and sensor data serialization.

For engineers reviewing the HEF4021BP-Q100 datasheet, HEF4021BP-Q100 pinout, HEF4021BP-Q100 application, or HEF4021BP-Q100 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, 16-pin SO16/TSSOP16 package compatibility, parallel-load timing margins (tW ≥ 12 ns at 15 V), propagation delay (tPHL ≤ 80 ns at 15 V, CL = 50 pF), and CMOS-level input/output voltage thresholds (VIH = 11.0 V at VDD = 15 V).

Technical Context

The HEF4021BP-Q100 implements eight cascaded D-type master-slave flip-flops, each with independent set (SD) and clear (CD) direct inputs. Its dual-mode operation-parallel load when PL = HIGH (asynchronous, independent of CP/DS) and serial shift when PL = LOW-enables flexible data capture and streaming in resource-constrained microcontroller interfaces.

Schmitt-trigger action on CP ensures robust clocking under slow-rising signals (Δt/ΔV ≤ 0.08 μs/V at VDD = 15 V), while CMOS architecture delivers low static power (IDD ≤ 600 μA at 15 V, +125 °C) and high noise immunity (HBM ESD > 2000 V). All inputs require termination to VDD, VSS, or driven logic levels per JEDEC JESD13-B compliance.

Key Specifications

Pinout & Package

HEF4021BP-Q100 is supplied in a 16-lead plastic small outline package (SO16, SOT109-1) with 3.9 mm body width and standard 1.27 mm lead pitch. Pin 1 index is marked by a notch or bevel; leads are gull-wing shaped for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC165QPWRQ1 and 74LVC164APW-Q100, the HEF4021BP-Q100 uniquely combines AEC-Q100 Grade 1 qualification, 3–15 V operation, per-stage SD/CD control, and buffered Q5–Q7 outputs - making it the only option for robust, mixed-voltage automotive PISO functions requiring asynchronous state capture and extended temperature reliability.

Availability

HEF4021BP-Q100 is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor aggregation nodes, LED tail light drivers, and legacy microcontroller GPIO expansion requiring stable component supply across extended temperature and voltage ranges.

Supply support for HEF4021BP-Q100 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

Nexperia is a leading semiconductor manufacturer specializing in high-performance, high-reliability logic, analog, and discrete components for automotive, industrial, and consumer markets.

The HEF4021BP-Q100 belongs to Nexperia's automotive-qualified logic family, designed specifically for robust signal conditioning and data serialization in harsh automotive environments where wide supply range, extended temperature operation, and AEC-Q100 compliance are mandatory.

FAQ

What is the maximum clock frequency supported by the HEF4021BP-Q100?

The HEF4021BP-Q100 supports a maximum clock frequency (fclk(max)) of 40 MHz at VDD = 15 V, 30 MHz at VDD = 10 V, and 13 MHz at VDD = 5 V. These values are derived from dynamic characterization with CL = 50 pF and tr/tf ≤ 20 ns. At 12 V nominal automotive supply, typical fclk(max) is ~35 MHz - sufficient for most body control and lighting sequencing applications. The HEF4021BP-Q100 datasheet specifies these limits in Table 7 under "maximum clock frequency".

Does the HEF4021BP-Q100 support both 5 V and 12 V operation?

Yes, the HEF4021BP-Q100 is fully specified for operation from 3.0 V to 15.0 V, including standard 5 V digital logic rails and 12 V automotive battery systems. Static and dynamic parameters - such as VIH (11.0 V at VDD = 15 V), VOL (≤0.05 V), and tPHL (≤80 ns) - are guaranteed across this full range. This eliminates level-shifting circuitry when interfacing with mixed-voltage subsystems, and the HEF4021BP-Q100 maintains AEC-Q100 Grade 1 qualification across the entire operating window.

How does the asynchronous parallel load (PL) function interact with the clock (CP) and serial data (DS) inputs?

When PL is HIGH, the HEF4021BP-Q100 asynchronously loads D0–D7 into all eight register stages regardless of CP or DS state - effectively freezing serial operation. When PL transitions LOW, the device enters serial shift mode: subsequent LOW-to-HIGH CP transitions shift DS data rightward through the register. The HEF4021BP-Q100 function table (Table 3) confirms that PL = HIGH forces Q5–Q7 to reflect D5–D7 immediately, while PL = LOW enables DS-driven shifting. This dual-mode behavior is central to the HEF4021BP-Q100's role in deterministic state capture and streaming.

What package options are available for the HEF4021BP-Q100?

The HEF4021BP-Q100 is offered exclusively in the 16-lead SO16 plastic small outline package (SOT109-1), with 3.9 mm body width and 1.27 mm lead pitch. While the HEF4021B-Q100 family includes TSSOP16 (SOT403-1) variants like HEF4021BTT-Q100, the "P" suffix in HEF4021BP-Q100 explicitly denotes the SO16 package per Nexperia's ordering information (Table 1). No DIP or other variants are currently available for the -Q100 automotive grade.

Is the HEF4021BP-Q100 pin-compatible with older HEF4021B variants?

Yes, the HEF4021BP-Q100 maintains identical pinout, electrical characteristics, and functional behavior as non-automotive HEF4021B devices (e.g., HEF4021BT), with the sole enhancement being AEC-Q100 Grade 1 qualification and extended temperature validation (-40 °C to +125 °C). Pin assignments for D0–D7, Q5–Q7, CP, PL, DS, VDD, and VSS match exactly per Figure 1 and Table 2. Therefore, the HEF4021BP-Q100 can be used as a drop-in replacement in existing designs requiring automotive-grade reliability without PCB or firmware changes.