Nexperia USA Inc. HEF4020BT,653

Overview

HEF4020BT,653 from Nexperia is a 14-stage CMOS binary ripple counter with asynchronous master reset (MR), clock input (CP) triggered on HIGH-to-LOW transition, and 12 buffered parallel outputs (Q0, Q3–Q13). It operates across 3.0 V to 15.0 V supply, supports industrial temperature range (−40 °C to +85 °C), and delivers propagation delays as low as 20 ns at 15 V - used in timing control, frequency division, and digital event sequencing circuits.

For engineers reviewing the HEF4020BT,653 datasheet, HEF4020BT,653 pinout, HEF4020BT,653 application, or HEF4020BT,653 equivalent, key selection criteria include its 14-bit counting depth, edge-triggered asynchronous reset behavior, SO16 package compatibility, and voltage-flexible operation across 5 V/10 V/15 V logic systems.

Technical Context

The HEF4020BT,653 implements a cascaded chain of 14 static toggle flip-flops, advancing only on the falling edge of CP. Each stage drives the next via direct internal connection, resulting in ripple propagation - not synchronous update - making output timing dependent on cumulative stage delay.

Its MR input is active-HIGH and asynchronous, forcing all outputs LOW regardless of CP state. Inputs include clamp diodes enabling safe interfacing to voltages exceeding VDD when current-limiting resistors are used, and outputs feature standardized symmetrical drive strength with VOH ≥ 14.95 V and VOL ≤ 0.05 V at VDD = 15 V.

Key Specifications

Pinout & Package

HEF4020BT,653 is housed in a plastic small outline package (SO16), SOT109-1 variant, with 16 leads and 3.9 mm body width. Pin 1 index is marked by a beveled corner or notch; pin numbering follows standard SO16 convention (counterclockwise from index).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4020BE and 74HC4020PW,118, the HEF4020BT,653 uniquely balances wide-voltage operation (3–15 V), industrial temperature support, and proven ripple-counter reliability - making it the preferred choice for voltage-flexible, maintenance-critical industrial timing where 10 V or 15 V rails remain in service.

Availability

HEF4020BT,653 is available at Aetrix Electronics and suitable for industrial timer control, digital frequency division, event sequencing logic, and legacy system clock scaling requiring stable component supply over extended production lifecycles.

Supply support for HEF4020BT,653 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 delivering high-performance, reliable logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and sustainability.

The HEF4020BT,653 belongs to Nexperia's legacy CMOS logic family designed for robust, voltage-flexible digital timing functions in industrial, automation, and instrumentation systems where long-term availability and wide operating margins are essential.

FAQ

What is the maximum clock frequency supported by HEF4020BT,653 at 5 V, 10 V, and 15 V?

At VDD = 5 V, fmax is 5 MHz (typical) and 2.5 MHz (minimum); at 10 V, it is 13 MHz (typical) and 6.5 MHz (minimum); at 15 V, it reaches 18 MHz (typical) and 9 MHz (minimum). These values assume CL ≤ 50 pF and tr/tf ≤ 20 ns per the datasheet test conditions. Performance degrades linearly with increasing load capacitance.

Does HEF4020BT,653 support synchronous reset or only asynchronous reset?

The HEF4020BT,653 provides only an asynchronous master reset (MR) input - it clears all 14 stages immediately upon assertion, independent of the CP clock edge. There is no provision for synchronous reset; any reset synchronization must be implemented externally using additional logic or clock gating.

Why does the pinout omit Q1, Q2, and Q14 outputs?

The HEF4020BT,653 outputs only Q0 and Q3 through Q13 - totaling 12 buffered outputs - because internal stages Q1 and Q2 are not routed to pins. This is a deliberate architectural choice to reduce package pin count while retaining the full 14-bit count capability internally; Q1/Q2 signals remain accessible only as internal nodes.

Can HEF4020BT,653 be operated at 2.5 V supply voltage?

No - the absolute minimum recommended supply voltage is 3.0 V per Table 5. Operation below 3.0 V risks unreliable toggle behavior, increased propagation delay variation, and potential failure to meet static parameter specifications (e.g., VIH/VIL thresholds). The device is not characterized or guaranteed for 2.5 V operation.