NXP Semiconductors HEF40174BP,652

Overview

HEF40174BP,652 from NXP Semiconductors is a hex edge-triggered D-type flip-flop in a 16-pin DIP package, featuring six independent data inputs (D0–D5), asynchronous master reset (MR), clock input (CP), and buffered outputs (Q0–Q5). It operates across 3 V to 15 V supply range, functions from −40 °C to +85 °C, and delivers propagation delays as low as 20 ns at 15 V - used in synchronous digital logic control and register storage within industrial timing circuits.

For engineers reviewing the HEF40174BP,652 datasheet, HEF40174BP,652 pinout, HEF40174BP,652 application, or HEF40174BP,652 equivalent, this page provides verified functional behavior, validated pin-level circuit roles, confirmed static/dynamic specifications at multiple VDD levels, and real-world use context for shift registers, pattern generation, and buffer/register design.

Technical Context

The HEF40174BP,652 implements six identical CMOS D-type flip-flops with fully static operation and edge-triggered clocking on the LOW-to-HIGH transition of CP. Its asynchronous MR input forces all Q outputs LOW regardless of CP or D states, enabling global reset without clock dependency.

Each flip-flop exhibits symmetrical output drive capability (±3.6 mA at 15 V), standardized voltage thresholds (VIH = 11.0 V, VIL = 4.0 V at VDD = 15 V), and guaranteed setup/hold times (tsu = 10 ns, th = 5 ns at 15 V), supporting reliable operation in mixed-voltage digital systems.

Key Specifications

Pinout & Package

HEF40174BP,652 uses the SOT38-4 plastic dual in-line package (DIP16) with 300-mil lead spacing, 19.5 mm × 6.5 mm body, and through-hole mounting compatibility.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex D-type flip-flop applications.

Compared with HEF40174BP,652, CD40174BE offers extended voltage tolerance but sacrifices speed, while 74HC174D delivers superior timing performance at lower voltages but removes the critical asynchronous MR functionality - making HEF40174BP,652 the only choice for industrial 12 V systems needing guaranteed global reset.

Availability

HEF40174BP,652 is available at Aetrix Electronics and suitable for industrial control panels, programmable logic sequencers, and test equipment requiring stable component supply across extended temperature and voltage ranges.

Supply support for HEF40174BP,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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with over 50 years of analog and logic IC heritage.

The HEF40174BP,652 belongs to NXP's legacy 4000-series CMOS logic family, designed specifically for robust, wide-supply-voltage digital interfacing in harsh industrial environments where reliability and long-term availability are critical.

FAQ

What is the maximum clock frequency supported by the HEF40174BP,652?

The HEF40174BP,652 supports a maximum clock frequency of 45 MHz at VDD = 15 V, as specified in the dynamic characteristics table. This value is derived from the minimum CP pulse width (20 ns LOW time) and propagation delay limits. At 5 V operation, fmax drops to 11 MHz. Designers must verify timing margins using actual load capacitance and signal rise/fall rates per Table 7.

Does the HEF40174BP,652 have a synchronous or asynchronous reset?

The HEF40174BP,652 features an asynchronous master reset (MR) on Pin 1. When MR is LOW, all six outputs (Q0–Q5) are forced LOW immediately, regardless of the CP state or D-input values. This behavior is confirmed in the functional description and function table - MR overrides all clocked operations and requires no clock edge to take effect.

Can unused inputs on the HEF40174BP,652 be left floating?

No - unused inputs on the HEF40174BP,652 must be tied to VDD, VSS, or another valid logic level. The datasheet explicitly states this requirement in Section 1 to prevent undefined logic states, increased power consumption, or susceptibility to noise-induced switching. Floating CMOS inputs can cause partial device activation and thermal instability.

What package type does the HEF40174BP,652 use?

The HEF40174BP,652 uses the SOT38-4 plastic dual in-line package (DIP16), a through-hole 16-pin format with 300-mil lead spacing and 19.5 mm × 6.5 mm body dimensions. This is confirmed in Table 1 (Ordering Information) and Figure 6 (Package outline), distinguishing it from the SO16 variant (HEF40174BT).

How does the HEF40174BP,652 handle input transition rates?

The HEF40174BP,652 specifies maximum input transition rise/fall rates in Table 5: 3.75 µs/V at 5 V, 0.5 µs/V at 10 V, and 0.08 µs/V at 15 V. Slower edges increase propagation delay uncertainty and risk setup/hold violations. Designers must ensure input signals meet these slew-rate requirements - especially critical for reliable operation near fmax.