Nexperia USA Inc. HEF4047BT-Q100J

Overview

HEF4047BT-Q100 from Nexperia is an AEC-Q100 Grade 3 qualified retriggerable monostable/astable multivibrator in SO14 package, operating from -40 °C to +85 °C. It supports both positive- and negative-edge triggered monostable operation with external RC timing (Rt/Ct), delivers true/complemented buffered outputs (O, O), and provides oscillator output (pin 13) for clock division. Used in automotive timing control, engine management signal conditioning, and fault-tolerant pulse generation.

For engineers reviewing the HEF4047BT-Q100 datasheet, HEF4047BT-Q100 pinout, HEF4047BT-Q100 application, or HEF4047BT-Q100 equivalent, key selection criteria include RC-programmable pulse width (t_M = 2.48·Rt·Ct), astable period accuracy (±7% at 10 V), retrigger capability on +TRIGGER/RETRIGGER inputs, and automotive-grade ESD robustness (HBM >2000 V, CDM >1000 V).

Technical Context

The device integrates a gate-able astable multivibrator with dual-mode logic control: ASTABLE input enables free-running oscillation (50% duty cycle at O/O), while +TRIGGER/−TRIGGER select edge-triggered monostable action. The internal frequency divider (÷2) feeds OSCILLATOR OUTPUT (pin 13), whose period is half that of O/O in astable mode.

Retrigger functionality operates exclusively on leading edges applied jointly to +TRIGGER and RETRIGGER; output remains HIGH as long as inter-pulse intervals are shorter than the RC-determined time constant. Master Reset (MR) forces immediate output termination and ensures power-on suppression.

Key Specifications

Pinout & Package

SO14 plastic small outline package (SOT108-1), 14-pin, body width 3.9 mm, lead pitch 1.27 mm, compliant with JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4047BE and 74HC4047D, the HEF4047BT-Q100 uniquely combines AEC-Q100 Grade 3 qualification, 3–15 V operation with input clamping, and RC-timing predictability across temperature-making it the sole choice for production automotive timing functions requiring functional safety alignment.

Availability

HEF4047BT-Q100 is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera synchronization requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for HEF4047BT-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 for automotive, industrial, and mobile markets.

The HEF4047BT-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for robust, RC-programmable timing in harsh-temperature vehicle subsystems where reliability and qualification compliance are mandatory.

FAQ

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

The datasheet specifies a minimum external timing capacitor (Ct) of 100 pF to ensure accuracy and minimize impact from stray capacitance. Using smaller values increases sensitivity to parasitic effects and reduces pulse-width predictability. Capacitors must be non-polarized with leakage resistance significantly higher than Rt (e.g., >10× Rt) to prevent timing drift.

Can the HEF4047BT-Q100 generate a precise 50% duty cycle at all outputs?

Only the O and O outputs guarantee 50% duty cycle in astable mode. The OSCILLATOR OUTPUT (pin 13) has a period equal to half that of O/O but does not guarantee 50% duty cycle due to internal logic propagation asymmetries. For symmetric clocking, use O/O-not OSCILLATOR OUTPUT-as the system clock source.

How does the retrigger function behave when multiple pulses arrive within the RC time constant?

In retrigger mode (pins 8 and 12 asserted together), each new leading edge extends the output pulse. The final pulse terminates a variable time (t_D) after the last retrigger edge-determined by the second rising edge of the internal oscillator output. This enables adaptive pulse stretching for applications like throttle position transient capture without MCU intervention.

Is external pull-up or pull-down required on unused inputs such as ASTABLE or RETRIGGER?

Yes. Unused inputs-including ASTABLE (pins 4, 5), RETRIGGER (pin 12), and −TRIGGER (pin 6)-must be tied to VDD or VSS via ≤10 kΩ resistors. Floating CMOS inputs risk increased supply current, noise susceptibility, and potential latch-up. The datasheet explicitly warns against leaving any input unconnected in automotive environments.