NXP Semiconductors 74HC174N,652

Overview

74HC174N,652 from NXP Semiconductors is a hex positive edge-triggered D-type flip-flop with asynchronous master reset, operating from 2.0 V to 6.0 V supply voltage, featuring 6 independent D inputs (D0–D5), 6 Q outputs (Q0–Q5), and common clock (CP) and master reset (MR) pins. It delivers propagation delay as low as 16 ns at VCC = 6.0 V and supports industrial temperature range from −40 °C to +125 °C in DIP16 package - used in digital control logic, data latching, and synchronous state-holding circuits.

For engineers reviewing the 74HC174N,652 datasheet, 74HC174N,652 pinout, 74HC174N,652 application, or 74HC174N,652 equivalent, key selection considerations include CMOS-level input compatibility, 16-pin DIP mechanical footprint, edge-triggered storage timing, and guaranteed operation across extended temperature and supply voltage ranges.

Technical Context

This device implements six identical, independent D-type latches synchronized to the LOW-to-HIGH transition of CP. Each flip-flop stores the Dn input value meeting setup/hold time requirements (e.g., tsu = 10 ns, th = 3 ns at VCC = 6.0 V) and presents it at Qn on clock edge. MR operates asynchronously: a LOW forces all Q outputs LOW regardless of CP state.

Input clamp diodes allow interfacing to voltages exceeding VCC when current-limiting resistors are used. The device complies with JEDEC standard no. 7A and meets ESD protection levels of >2000 V HBM and >200 V MM, supporting robust operation in mixed-signal board environments.

Key Specifications

Pinout & Package

74HC174N,652 is supplied in plastic dual in-line package (DIP16), SOT38-4 variant, with 16 leads spaced at 300 mil (7.62 mm) row-to-row and 0.3 inch (7.62 mm) lead pitch. Body dimensions: 19.5 mm × 6.48 mm × 3.6 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT174N,652, the 74HC174N,652 offers higher noise immunity in pure CMOS systems; versus SN74HC174N, it provides faster propagation and tighter timing guarantees across −40 °C to +125 °C, making it preferable for timing-critical industrial control.

Availability

74HC174N,652 is available at Aetrix Electronics and suitable for industrial control logic, digital instrumentation, serial-to-parallel conversion, and state machine register file applications requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74HC174N,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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The 74HC174N,652 belongs to NXP's legacy 74HC logic family, designed for robust, low-power, pin-compatible replacements of standard TTL functions in industrial and consumer equipment.

FAQ

What is the maximum clock frequency supported by the 74HC174N,652 across its full temperature range?

The 74HC174N,652 supports a maximum clock frequency of 20 MHz at VCC = 4.5 V over the full −40 °C to +125 °C operating range, as specified in Table 7. At VCC = 6.0 V, fmax reaches 24 MHz under same conditions. These values account for worst-case propagation delay, setup, and hold timing margins - critical for reliable operation in industrial timing-critical designs using the 74HC174N,652.

Does the 74HC174N,652 support operation at 3.3 V supply voltage?

Yes, the 74HC174N,652 is fully specified for operation at 3.3 V: VIH min = 2.31 V (70 % of 3.3 V), VOL max = 0.1 V at 20 µA load, and tpd = 25 ns typical. Its 2.0 V to 6.0 V supply range makes the 74HC174N,652 suitable for mixed-voltage systems interfacing with 3.3 V microcontrollers while retaining compatibility with legacy 5 V peripherals.

How does the master reset (MR) pin behave during power-up sequencing?

The MR pin is active-LOW and asynchronous: asserting MR LOW at any time forces Q0–Q5 immediately LOW, overriding CP and D inputs. During power-up, if MR is held HIGH (via pull-up), outputs remain undefined until first valid CP edge. To ensure known state, tie MR to VCC through 10 kΩ and assert LOW only when intentional reset is required - a practice confirmed in functional testing of the 74HC174N,652.

Can the 74HC174N,652 inputs safely interface with 12 V signals?

Yes - the 74HC174N,652 includes integrated input clamp diodes to GND and VCC. When interfacing 12 V signals, use a series current-limiting resistor (e.g., 10 kΩ) to restrict IIK to ≤±20 mA, as specified in Table 4. This protects the 74HC174N,652 against overvoltage damage while enabling direct connection to higher-voltage industrial sensors or relay drivers.

Is the 74HC174N,652 pin-compatible with other 74xx174 variants in DIP16 package?

Yes - the 74HC174N,652 shares identical pinout (per Table 2), electrical timing, and DC characteristics with 74HCT174N,652, SN74HC174N, and MC74HC174N in DIP16. All feature MR on pin 1, CP on pin 9, VCC on pin 16, and GND on pin 8. This uniformity allows drop-in substitution in existing 74xx174-based designs using the 74HC174N,652, provided input logic levels match the selected variant.