Nexperia USA Inc. HEF4047BT,653

Overview

HEF4047BT,653 from Nexperia is a CMOS retriggerable monostable/astable multivibrator in SO14 package, supporting both positive- and negative-edge triggered one-shot operation (pulse width = 2.48·R_tC_t) and free-running astable mode (period = 4.40·R_tC_t at pins 10/11). It delivers true/complemented buffered outputs (O, O), oscillator output (pin 13), and operates from 3 V to 15 V across -40 °C to +85 °C - used in timing control, pulse generation, and clock gating for industrial logic systems.

For engineers reviewing the HEF4047BT,653 datasheet, HEF4047BT,653 pinout, HEF4047BT,653 application, or HEF4047BT,653 equivalent, key selection considerations include external RC programmability of pulse width/period, retrigger capability with simultaneous +TRIGGER/RETRIGGER inputs, master reset (MR) termination, input clamping diodes enabling overvoltage-tolerant interfacing, and guaranteed 50% duty cycle in astable mode at O/O outputs.

Technical Context

The HEF4047BT,653 integrates dual-mode operation via internal logic that routes +TRIGGER/−TRIGGER, ASTABLE/ASTABLE, RETRIGGER, and MR signals to a gated astable core with flip-flop-based monostable action. Its oscillator output (pin 13) runs at half the frequency of O/O in astable mode, while monostable pulse width remains independent of trigger duration due to edge-sensitive latching.

Timing is fully determined by external R_t (pin 2–3) and C_t (pin 1–3); recommended values are 10 kΩ ≤ R_t ≤ 1 MΩ and C_t ≥ 100 pF. Input clamping diodes on all logic inputs allow safe interfacing to voltages beyond V_DD, and MR provides asynchronous pulse termination or power-on suppression.

Key Specifications

Pinout & Package

HEF4047BT,653 is housed in a plastic small outline package (SO14), SOT108-1, with 14 leads and 3.9 mm body width. Pin 1 is marked by a bevelled corner or notch; pin numbering follows standard SOIC convention counterclockwise from pin 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4047BE and 74HC4047, the HEF4047BT,653 uniquely combines retrigger capability, input clamping diodes, and 3–15 V operation - making it the only option among the three suitable for industrial-grade, overvoltage-tolerant, dynamically adjustable timing without external protection or voltage translation.

Availability

HEF4047BT,653 is available at Aetrix Electronics and suitable for industrial timer circuits, logic-controlled clock gating, PWM signal shaping, and edge-triggered event sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HEF4047BT,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 focused on essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

The HEF4047BT,653 belongs to Nexperia's legacy CMOS logic portfolio designed for robust, low-power timing functions in harsh environments - emphasizing wide supply range, ESD resilience, and interoperability with older 4000-series designs.

FAQ

What is the minimum external capacitor value recommended for stable operation?

The datasheet specifies C_t ≥ 100 pF for accurate timing performance. Using smaller values increases sensitivity to stray capacitance and degrades pulse width accuracy. Capacitors below 100 pF may cause erratic oscillation or failure to trigger, especially at higher supply voltages or temperatures.

Can the OSCILLATOR OUTPUT (pin 13) be used as a primary clock source?

No - pin 13 provides a signal at half the frequency of O/O in astable mode, but its duty cycle is not guaranteed. For clock distribution, use O or O outputs, which deliver precisely 50% duty cycle. Pin 13 is intended for auxiliary timing feedback or external counter synchronization, not critical clocking.

How does the MR (master reset) pin behave during power-up?

A HIGH level on MR is required at power-on to prevent spurious output pulses. If MR is left floating or pulled LOW during V_DD ramp-up, the device may generate an unintended output pulse. A pull-up resistor to V_DD or controlled reset circuit is mandatory for reliable startup behavior.

Is the HEF4047BT,653 compatible with 5 V TTL logic inputs?

Yes - with proper interface. The HEF4047BT,653 accepts VIH ≥ 3.5 V (at V_DD = 5 V), matching standard TTL output levels. However, its inputs are CMOS, so direct connection is safe only if TTL outputs meet the 3.5 V threshold; otherwise, a level-shifter or resistor divider is needed.