Nexperia USA Inc. HEF4017BT-Q100J

Overview

HEF4017BT-Q100 from Nexperia is an automotive-qualified 5-stage Johnson decade counter IC with ten spike-free active HIGH decoded outputs (Q0–Q9), an active LOW carry output (Q5-9), dual-edge-triggered clock inputs (CP0 and CP1), and an asynchronous master reset (MR). It operates from 3 V to 15 V, supports -40 °C to +125 °C ambient range, and features Schmitt-trigger clock inputs for tolerance to slow signal edges. It is used in sequential timing control circuits such as LED chasers, rotary switch emulation, and automotive dashboard counters.

For engineers reviewing the HEF4017BT-Q100 datasheet, HEF4017BT-Q100 pinout, HEF4017BT-Q100 application, or HEF4017BT-Q100 equivalent, this page provides verified functional context, validated pin roles, automotive-grade operating limits, propagation delay behavior across supply voltages, and real-world use cases in sequential logic and decoding systems.

Technical Context

The HEF4017BT-Q100 implements a 5-flip-flop Johnson counter architecture that generates a 10-state sequence with overlapping decoded outputs-each output remains HIGH for exactly one full clock cycle before advancing. Its dual-clock input structure (CP0 edge-triggered on LOW-to-HIGH while CP1 = LOW; CP1 edge-triggered on HIGH-to-LOW while CP0 = HIGH) enables flexible cascading and synchronous multi-stage counting without external gating.

Internal automatic code correction ensures recovery from illegal states within ≤11 clock cycles, and Schmitt-trigger inputs provide hysteresis of ≥1.0 V (at VDD = 5 V), enabling robust operation with noisy or slow-rising clock signals. The Q5-9 carry output goes LOW during states 5–9, allowing direct connection to CP0 of a downstream counter for seamless decade expansion.

Key Specifications

Pinout & Package

HEF4017BT-Q100 is housed in a plastic SO16 (SOT109-1) package: 16-pin small outline, 3.9 mm body width, gull-wing leads, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar decade counter applications.

Compared with CD4017BE and 74HC4017D, the HEF4017BT-Q100 uniquely combines AEC-Q100 Grade 1 qualification, 3–15 V operation, integrated carry output, and Schmitt-trigger clock inputs-making it the only drop-in solution for automotive decade counting without design compromises.

Availability

HEF4017BT-Q100 is available at Aetrix Electronics and suitable for automotive dashboard instrumentation, ADAS diagnostic sequencers, and body control module timing functions requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HEF4017BT-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 global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions optimized for automotive, industrial, and mobile applications.

The HEF4017BT-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to replace legacy 4000-series counters in safety-critical and thermally demanding vehicle subsystems while maintaining pin-and-function compatibility.

FAQ

What is the minimum pulse width required for reliable MR assertion?

The MR input requires a minimum HIGH pulse width of 10 ns at VDD = 15 V, 20 ns at VDD = 10 V, and 30 ns at VDD = 5 V to guarantee synchronous reset across all process corners and temperatures. This specification is verified per Figure 8 in the datasheet and accounts for worst-case internal propagation delays through the reset path.

Can CP0 and CP1 be driven from the same clock source?

No - driving both CP0 and CP1 from the same signal violates the functional table: when CP0 = CP1, the counter enters a "no change" state (Table 3). To advance the counter, CP0 and CP1 must be complementary and properly phased: CP1 must be LOW while CP0 receives a rising edge, or CP0 must be HIGH while CP1 receives a falling edge.

How does the Q5-9 carry output behave during reset?

During MR assertion, Q5-9 goes HIGH (inactive) simultaneously with Q0 going HIGH and Q1–Q9 going LOW. This behavior is explicitly defined in Section 1: "A HIGH on MR resets the counter to zero (Q0 = Q5-9 = HIGH; Q1 to Q9 = LOW) independent of the clock inputs." No propagation delay occurs - Q5-9 transitions synchronously with the reset event.

Is external pull-up or pull-down required on unused inputs?

Yes - per Section 1, "Unused inputs must be connected to VDD, VSS, or another input." Leaving inputs floating risks metastability, increased supply current, and unpredictable state transitions due to CMOS input sensitivity. For CP0 and CP1, tying unused clock inputs to VSS prevents spurious triggering; MR should be pulled LOW via 10 kΩ unless actively driven.