Nexperia USA Inc. HEF4043BT,652

Overview

HEF4043BT,652 from Nexperia is a quad R/S latch IC with 3-state outputs and a common output enable (OE) input, designed for synchronous data storage and bus isolation in digital logic systems. It operates across 3.0 V to 15.0 V supply, supports -40 °C to +85 °C ambient range, features active-HIGH set/reset inputs per latch, and delivers high-impedance output states when OE is LOW - enabling shared-bus applications such as 4-bit register files in industrial control panels.

For engineers reviewing the HEF4043BT,652 datasheet, HEF4043BT,652 pinout, HEF4043BT,652 application, or HEF4043BT,652 equivalent, key selection criteria include its wide VDD range (3–15 V), guaranteed 3-state timing (tPHZ ≤ 25 ns at 15 V), JEDEC JESD13-B compliance, and SO16 package compatibility with legacy 4000-series logic layouts.

Technical Context

The HEF4043BT,652 implements four independent cross-coupled CMOS NOR-based R/S latches, each with dedicated active-HIGH set (nS) and reset (nR) inputs and a buffered 3-state output (nQ). Its OE input controls output driver enablement without affecting internal latch state, supporting bus-hold and hot-swap isolation.

Input clamp diodes allow safe interfacing to voltages exceeding VDD when used with current-limiting resistors. Static operation ensures zero dynamic power during hold states, while propagation delays scale predictably with load capacitance (e.g., tPLH = 7 ns + 0.16 ns/pF × CL at VDD = 15 V).

Key Specifications

Pinout & Package

HEF4043BT,652 is housed in a plastic small outline package (SO16), SOT109-1 variant, with 16 leads, 3.9 mm body width, and standard 1.27 mm lead pitch - compatible with IPC-7351B SOIC-16 land patterns.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad R/S latch with 3-state output applications.

Compared with CD4043BE and 74HC279PW, HEF4043BT,652 uniquely combines SO16 manufacturability, 3–15 V operation, and a dedicated OE pin - making it the sole option for industrial bus-isolated 4-bit storage where voltage flexibility and surface-mount compatibility are non-negotiable.

Availability

HEF4043BT,652 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital panel meter data latching, and legacy bus interface isolation requiring stable component supply across extended temperature and voltage ranges.

Supply support for HEF4043BT,652 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-enhancing components - delivering high-performance, reliable, and scalable logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The HEF4043BT,652 belongs to Nexperia's legacy-compatible 4000-series logic family, engineered specifically for industrial control systems requiring wide-VDD tolerance, robust ESD immunity, and drop-in replacement capability for aging 4043 designs.

FAQ

What is the maximum recommended load capacitance for HEF4043BT,652 outputs?

The datasheet specifies dynamic characteristics up to 50 pF (Table 10), and propagation delay formulas scale linearly with CL. While operation beyond 50 pF is possible, rise/fall times degrade proportionally - e.g., tPLH increases by 0.16 ns per additional pF at 15 V. For reliable timing closure in synchronous systems, keep total load ≤ 50 pF including PCB trace and probe capacitance.

Can HEF4043BT,652 be operated at 3.3 V supply?

Yes - the device is fully specified from 3.0 V to 15.0 V (Table 5). At 3.3 V, VIH = 2.31 V min and VIL = 1.0 V max ensure compatibility with standard 3.3 V CMOS logic. However, output drive strength drops to IOL ≈ 0.36 mA, so limit capacitive loads to ≤ 20 pF and avoid driving long traces or multiple inputs without buffering.

Is pin 13 (n.c.) safe to tie to ground or VDD?

No - pin 13 is internally unconnected (Table 2). Connecting it to any voltage violates the absolute maximum rating for VI (−0.5 V to VDD + 0.5 V) and risks latent damage. It must remain unpopulated or electrically floating; no routing, stitching, or thermal pad connection is permitted per Nexperia's package design.

How does OE affect power consumption during latch hold?

When OE = LOW, output drivers enter high-impedance state but internal latch circuitry remains fully powered and retains state - IDD stays at its static value (≤ 600 μA at 15 V). No reduction in supply current occurs because the core CMOS latches draw current regardless of output enable status; only the output stage is disabled.