Nexperia USA Inc. 74HCT174D,653

Overview

74HCT174D,653 from Nexperia is a hex positive-edge-triggered D-type flip-flop with asynchronous master reset, operating across 4.5 V to 5.5 V supply, delivering 30 MHz maximum clock frequency at 4.5 V and 69 MHz at 5.0 V (CL = 15 pF), with propagation delay as low as 18 ns and TTL-compatible input thresholds. It serves in synchronous data latching, register staging, and control-state storage within industrial PLC I/O modules and digital instrumentation signal chains.

For engineers reviewing the 74HCT174D,653 datasheet, 74HCT174D,653 pinout, 74HCT174D,653 application, or 74HCT174D,653 equivalent, key selection criteria include its TTL-level input compatibility, -40 °C to +125 °C extended temperature rating, SO16 package footprint, and guaranteed 5.2 mA output drive strength at VOH ≥ 3.98 V and VOL ≤ 0.26 V under load.

Technical Context

This device implements six independent edge-triggered D flip-flops sharing a common clock (CP) and asynchronous master reset (MR) input. Each stage samples Dn on the LOW-to-HIGH transition of CP and asserts Qn within 18–53 ns depending on VCC and load, with MR overriding clock action to force all Qn outputs LOW independently of CP timing.

Input clamping diodes enable safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The design supports JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V) compliance, with latch-up immunity >100 mA and ESD protection rated at HBM >2000 V and CDM >1000 V.

Key Specifications

Pinout & Package

74HCT174D,653 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise layout starting from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT174N and 74HCT174PW,118, the 74HCT174D,653 offers optimal balance of thermal performance, solderability, and legacy compatibility in the SO16 form factor-making it ideal for industrial control modules requiring long-term component availability and RoHS-compliant reflow processing.

Availability

74HCT174D,653 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital panel meter register staging, and motor control state storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 74HCT174D,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 essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HCT174 belongs to Nexperia's high-speed CMOS logic family, engineered specifically for robust, pin-compatible replacements of legacy TTL devices in industrial control, instrumentation, and communication infrastructure applications.

FAQ

What is the minimum pulse width required on the MR (pin 1) to ensure reliable reset?

The minimum MR pulse width is 20 ns at VCC = 4.5 V, as specified in Table 7 under tW for MR input LOW. This ensures full propagation through internal reset logic and stable assertion of all Qn outputs LOW, even under worst-case process/voltage/temperature conditions.

Can 74HCT174D,653 operate reliably at 3.3 V supply?

No - the 74HCT174 variant is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH = 2.0 V min) become marginal, and output drive (VOH ≥ 3.98 V) cannot be met. For 3.3 V systems, use the 74HC174D variant, which supports 2.0–6.0 V but requires CMOS-level inputs.

Is the SO16 package (SOT109-1) RoHS compliant and lead-free?

Yes - the 74HCT174D,653 uses a lead-free, halogen-free SO16 package conforming to RoHS Directive 2011/65/EU and Nexperia's environmental specifications. Terminal finish is matte tin, qualified for standard Pb-free reflow profiles up to 260 °C peak.

How does the 74HCT174D,653 handle input signals exceeding VCC?

Clamp diodes on all inputs allow safe operation with voltages up to VCC + 0.5 V when current is limited to ±20 mA (per Table 4). External series resistors must be sized to keep input current within this limit - e.g., a 1 kΩ resistor limits current to <0.5 mA for a 5.5 V input applied to a 5 V-powered device.