Nexperia USA Inc. HEF4027BT,653

Overview

HEF4027BT,653 from Nexperia is a dual positive-edge-triggered JK flip-flop in SO16 package, featuring independent asynchronous set (nSD) and clear (nCD) inputs, complementary Q/Q̅ outputs per section, Schmitt-trigger clock inputs for noise immunity, and operation across 3.0 V to 15.0 V supply. It implements synchronous data latching on rising clock edges and is used in digital control logic, counters, and register stages.

For engineers reviewing the HEF4027BT,653 datasheet, HEF4027BT,653 pinout, HEF4027BT,653 application, or HEF4027BT,653 equivalent, key selection criteria include dual JK functionality with independent async controls, wide-voltage CMOS compatibility (3–15 V), SO16 footprint, propagation delay down to 30 ns at 15 V, and industrial temperature range (-40 °C to +85 °C).

Technical Context

The HEF4027BT,653 integrates two independent JK flip-flops sharing no internal coupling-each with dedicated J, K, CP, SD, CD, Q, and Q̅ terminals. Its Schmitt-trigger clock input ensures reliable edge detection despite slow-rising signals, while clamp diodes on all inputs enable safe interfacing to voltages exceeding VDD via current-limiting resistors.

Functionally, it supports four operating modes per flip-flop: set (SD=H), reset (CD=H), toggle (J=K=H), and hold (J=K=L), with asynchronous priority over clocked operations. Propagation delays are voltage- and load-dependent, ranging from 30 ns (15 V, CL = 0 pF) to 280 ns (5 V, CL = 50 pF), and setup/hold times scale inversely with supply voltage.

Key Specifications

Pinout & Package

HEF4027BT,653 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads, 3.9 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a notch or dot; pin numbering follows counter-clockwise convention from top-left corner when viewed from component side.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual JK flip-flop applications.

Compared with CD4027BE and 74HC109PW,118, the HEF4027BT,653 uniquely balances wide-voltage operation (3–15 V), Schmitt-trigger clock noise immunity, and true asynchronous control-making it optimal for industrial control upgrades and mixed-supply legacy system integration.

Availability

HEF4027BT,653 is available at Aetrix Electronics and suitable for industrial control logic, binary counter design, and state register implementation requiring stable component supply across extended temperature and voltage ranges.

Supply support for HEF4027BT,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 leading semiconductor manufacturer specializing in high-performance, energy-efficient logic, discrete, and MOSFET components, with core expertise in automotive-grade and industrial reliability.

The HEF4027BT,653 belongs to Nexperia's legacy 4000-series CMOS logic family, designed specifically for backward-compatible upgrades of aging industrial and instrumentation systems requiring wide-VDD tolerance and robust noise immunity.

FAQ

What is the minimum clock pulse width required for reliable operation?

The minimum clock pulse width (tW) for HEF4027BT,653 is 12 ns at VDD = 15 V, 15 ns at 10 V, and 24 ns at 5 V. This ensures sufficient time for internal metastability resolution and guarantees correct sampling of J/K inputs before the rising edge completes. Exceeding these values prevents setup/hold violations and avoids invalid output states.

Can the HEF4027BT,653 drive TTL loads directly?

Yes-its output drive strength (IOL = 3.6 mA, IOH = -3.6 mA at VDD = 15 V) exceeds standard TTL input requirements (IIL = -1.6 mA, IIH = 40 μA). At 5 V supply, it delivers 0.36 mA sink/source, sufficient for one standard TTL input or multiple 4000-series CMOS gates. No buffer is needed for direct TTL interfacing at VDD ≥ 5 V.

How does the Schmitt-trigger clock input improve noise immunity?

The Schmitt-trigger on nCP provides hysteresis (~1.5 V at VDD = 15 V), meaning the rising threshold is ~1.5 V higher than the falling threshold. This prevents multiple triggering from slow or noisy clock edges and eliminates false toggling due to ringing or EMI on long traces-critical in industrial motor control or PLC backplanes.

Is there any restriction on using VDD and VSS pins for decoupling?

VDD (Pin 16) and VSS (Pin 8) are the sole dedicated power pins; no alternate supply paths exist. A 100 nF ceramic capacitor must be placed between them within 10 mm of the package, and bulk capacitance (e.g., 10 μF) should be added nearby. Sharing VSS with other ICs without star grounding risks ground bounce and timing skew in multi-device systems.