Nexperia USA Inc. HEF4528BT-Q100J

Overview

HEF4528BT-Q100J from Nexperia is a dual retriggerable-resettable monostable multivibrator in SO16 package, operating from 3 V to 15 V supply, with independent timing control per channel via external R_EXT/C_EXT, active-low clear (nCD), and complementary outputs (nQ/nQ̅). It delivers precise pulse generation for automotive timing functions such as window lift debounce and wiper interval control.

For engineers reviewing the HEF4528BT-Q100J datasheet, HEF4528BT-Q100J pinout, HEF4528BT-Q100J application, or HEF4528BT-Q100J equivalent, key selection criteria include its AEC-Q100 Grade 3 qualification, -40 °C to +85 °C operation, dual-channel retriggerability, external timing flexibility, and CMOS-level input/output compatibility across 5/10/15 V rails.

Technical Context

This IC implements two independent edge-triggered monostables, each accepting either HIGH-to-LOW on nA (with nB LOW) or LOW-to-HIGH on nB (with nA HIGH) to initiate a positive-going output pulse on nQ. Pulse width is fully determined by external R_EXT and C_EXT, with K-coefficients of 0.42 (5 V), 0.32 (10 V), and 0.30 (15 V).

Each channel features an asynchronous active-low clear (nCD) that forces nQ LOW and nQ̅ HIGH while blocking further triggering. Unused inputs must be tied to VDD, VSS, or another valid logic level - no floating inputs permitted. Static CMOS design ensures zero static current draw and high noise immunity.

Key Specifications

Pinout & Package

Package: SO16 plastic small outline (SOT109-1), 16-pin, 3.9 mm body width, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV221AQPWRQ1 and MC14528BDG, the HEF4528BT-Q100J uniquely combines AEC-Q100 Grade 3 compliance, 3–15 V operation, and native retriggerable/resettable functionality - making it the only drop-in solution for production automotive timing where voltage flexibility and hardware-level fault recovery are mandatory.

Availability

HEF4528BT-Q100J is available at Aetrix Electronics and suitable for automotive body electronics, powertrain interface modules, and instrument cluster designs requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for HEF4528BT-Q100J 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 specializing in high-volume, high-reliability logic, analog, and discrete components, with leadership in automotive-qualified standard products.

The HEF4528BT-Q100J belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to replace legacy 4000-series devices in modern vehicle ECUs while meeting stringent AEC-Q100 reliability and thermal requirements.

FAQ

What is the minimum pulse width achievable with HEF4528BT-Q100J?

The shortest guaranteed pulse width is 140 ns (at VDD = 15 V, R_EXT = 5 kΩ, C_EXT = 15 pF), per Table 7. With smaller R_EXT and C_EXT, sub-100 ns pulses are possible but not characterized over temperature and voltage extremes - design margins require verification against Fig. 3 and the K-coefficient formula.

Can unused inputs be left floating?

No. All unused inputs must be tied to VDD, VSS, or a valid logic level per Section 1 General Description. Floating CMOS inputs cause increased supply current, unpredictable triggering, and potential latch-up due to intermediate voltage states - this is explicitly prohibited in the datasheet.

How does the retriggerable function behave during an active output pulse?

A new trigger (valid nA↓ or nB↑) occurring before the current pulse ends extends the output pulse duration from the new trigger edge - the timer resets and begins a fresh t_W interval. This behavior is inherent to the retriggerable architecture and confirmed in the functional description and Fig. 5 waveforms.

Is the HEF4528BT-Q100J compatible with 3.3 V logic systems?

Yes - the device operates down to 3.0 V VDD and specifies VIH = 1.5 V and VIL = 0.05 V at 3.3 V (interpolated from Table 6), ensuring reliable interfacing with 3.3 V microcontrollers. However, output drive strength and propagation delay degrade at lower voltages; verify timing margins using the extrapolation formulas in Table 7.