Nexperia USA Inc. HEF4528BT,653

Overview

HEF4528BT,653 from Nexperia is a dual retriggerable and resettable monostable multivibrator IC in SO16 package, operating from 3 V to 15 V supply, delivering programmable output pulse widths via external REXT/CEXT networks, with independent active-LOW clear inputs per section, and used in precision timing control for digital logic interfacing and pulse shaping.

For engineers reviewing the HEF4528BT,653 datasheet, HEF4528BT,653 pinout, HEF4528BT,653 application, or HEF4528BT,653 equivalent, key selection considerations include dual-section independence, retriggerability under active clear, voltage-scalable timing (K = 0.42–0.30), propagation delays down to 22 ns at 15 V, and SO16 thermal/power limits up to +85 °C ambient.

Technical Context

The HEF4528BT,653 implements two identical CMOS monostable sections, each with dual-edge triggering (nA: falling-edge, nB: rising-edge) and asynchronous active-LOW clear (nCD). Pulse width tW is determined by tW = K × REXT × CEXT, where K varies with VDD (0.42 at 5 V, 0.32 at 10 V, 0.30 at 15 V).

Each section provides true and complement outputs (nQ, nQ) with symmetrical VOH ≥ VDD − 0.05 V and VOL ≤ 0.05 V at 1 μA load, and supports dynamic operation up to 100 MHz equivalent toggle rate under 50 pF load at 10 V, with input transition rates as low as 0.08 μs/V at 15 V.

Key Specifications

Pinout & Package

HEF4528BT,653 is housed in a plastic SO16 (SOT109-1) package: 16-pin small outline, 3.9 mm body width, 1.27 mm lead pitch, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4528BE and 74HC4538D, the HEF4528BT,653 uniquely combines industrial temperature range, 15 V tolerance, retriggerable/resettable operation, and JEDEC-compliant ESD protection - making it the only option among the three qualified for wide-supply, noise-prone, and long-lifecycle embedded systems.

Availability

HEF4528BT,653 is available at Aetrix Electronics and suitable for industrial control panels, test equipment signal conditioning, and embedded timing subsystems requiring stable component supply across extended temperature and voltage ranges.

Supply support for HEF4528BT,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 high-volume, high-reliability logic, discrete, and MOSFET solutions, with manufacturing rooted in process control and automotive-grade quality systems.

The HEF4528B belongs to Nexperia's legacy CMOS logic family designed for robust, low-power timing functions in industrial and instrumentation applications where supply voltage flexibility and noise immunity are essential.

FAQ

What is the minimum pulse width achievable with HEF4528BT,653?

The shortest guaranteed pulse width is 140 ns at VDD = 15 V with REXT = 5 kΩ and CEXT = 15 pF, per datasheet Figure 5. With smaller CEXT (down to 1 pF) and lower REXT, sub-100 ns pulses are possible but not characterized; design margin should account for propagation delay (22 ns min) and output transition time (6 ns min).

Can unused inputs be left floating?

No - all unused inputs must be tied to VDD, VSS, or another driven input. Floating CMOS inputs cause increased supply current, potential oscillation, and susceptibility to ESD damage. The datasheet explicitly mandates this in Section 1, and leakage current rises significantly above ±0.3 μA if left unconnected.

How does the retriggerable mode behave when nCD is asserted mid-pulse?

Asserting nCD LOW during an active output pulse forces nQ immediately LOW and nQ HIGH, terminating the pulse regardless of timing components. The monostable resets fully and ignores further triggers until nCD returns HIGH - no residual timing state remains.

Is HEF4528BT,653 qualified for automotive use?

No - the HEF4528BT,653 is specified for −40 °C to +85 °C industrial operation and is not AEC-Q200 qualified. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products are unsuitable for safety-critical or automotive applications without additional validation by the customer.