NXP Semiconductors HEF4040BT,652

Overview

HEF4040BT,652 from Nexperia is a 12-stage CMOS binary ripple counter with asynchronous master reset (MR), clock input (CP) triggered on HIGH-to-LOW transition, and twelve buffered outputs (Q0–Q11). It operates from 3.0 V to 15.0 V, supports -40 °C to +85 °C ambient range, and features overvoltage-tolerant inputs up to 15 V-enabling use in level-shifting and frequency-division circuits in industrial timing systems.

For engineers reviewing the HEF4040BT,652 datasheet, HEF4040BT,652 pinout, HEF4040BT,652 application, or HEF4040BT,652 equivalent, key selection criteria include its 12-bit ripple architecture, MR-active-HIGH reset behavior, SO16 package compatibility, and parametric ratings at 5 V/10 V/15 V for mixed-voltage system integration.

Technical Context

The HEF4040BT,652 implements a cascaded chain of 12 static toggle flip-flops, where each stage divides the preceding stage's output by two-yielding Qn = CP ÷ 2ⁿ. Propagation delay from CP to Q0 is 78 ns (typ. at 5 V, CL = 50 pF), increasing incrementally per stage due to ripple topology.

Its asynchronous MR input forces all outputs LOW independently of CP timing, with minimum pulse width of 20 ns (at 15 V). Input clamping current is ±10 mA, and VIH/VIL thresholds scale with VDD (e.g., VIH = 11.0 V min at VDD = 15 V), supporting robust noise immunity and mixed-signal interfacing.

Key Specifications

Pinout & Package

HEF4040BT,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 automated PCB assembly and IPC-7351B footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-stage binary counter applications.

Compared with CD4040BE and 74HC4040PW,118, the HEF4040BT,652 uniquely balances wide supply range (3–15 V), overvoltage input tolerance, and industrial temperature rating-making it the only option that supports both 5 V microcontrollers and 12 V field sensors in a single timing IC.

Availability

HEF4040BT,652 is available at Aetrix Electronics and suitable for frequency division, time delay generation, industrial control counters, and level-shifting interfaces requiring stable component supply across automotive-adjacent and industrial environments.

Supply support for HEF4040BT,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-including logic, discrete, and MOSFET devices-with manufacturing rooted in process technology and high-volume reliability.

The HEF4040BT,652 belongs to Nexperia's HEF4000B series of bipolar-compatible CMOS logic ICs, designed specifically for industrial timing, control, and signal conditioning applications where wide supply range and rugged input tolerance are critical.

FAQ

What is the minimum pulse width required on the MR pin for reliable reset?

The MR pin requires a minimum HIGH pulse width of 20 ns at VDD = 15 V, 30 ns at VDD = 10 V, and 40 ns at VDD = 5 V (per Table 6). This ensures full propagation through all 12 flip-flop stages. Shorter pulses may result in partial or failed reset, especially under worst-case temperature and voltage conditions.

Can HEF4040BT,652 operate with a 3.3 V supply and interface directly with 5 V logic outputs?

No-while VDD can be set to 3.3 V, the inputs are overvoltage tolerant only up to 15 V *relative to VSS*, not relative to VDD. A 5 V input applied to CP or MR while VDD = 3.3 V exceeds the VI limit of VDD + 0.5 V (3.8 V), risking latch-up or damage. Use level translation for 5 V → 3.3 V interfacing.

Why does propagation delay increase significantly from Q0 to Q11?

This is inherent to ripple counter architecture: each stage triggers the next, so Q11 delay equals the sum of 12 individual stage delays (e.g., ~78 ns × 12 ≈ 936 ns at 5 V). The datasheet specifies CP→Q0 and Qn→Qn+1 delays separately to enable accurate timing margin calculation in cascade-critical designs.

Is HEF4040BT,652 suitable for automotive applications?

No-this device is not AEC-Q100 qualified and lacks automotive-specific testing (e.g., HTOL, ESD at 8 kV HBM). Nexperia explicitly states non-automotive qualification in Section 14 of the datasheet. For automotive use, consider AEC-Q100 qualified alternatives like the 74LVC1G74 or dedicated automotive timing ICs.