Nexperia USA Inc. 74AHC574D,112

Overview

74AHC574D,112 from Nexperia is an 8-bit positive-edge-triggered D-type flip-flop with 3-state non-inverting outputs, designed for bus-oriented data latching in mixed-voltage digital systems. It operates from 2.0 V to 5.5 V, features overvoltage-tolerant inputs (to 5.5 V), supports -40 °C to +125 °C ambient range, and delivers 4.4 ns typical propagation delay at 5 V with 15 pF load - used in microcontroller I/O expansion and address/data bus buffering.

For engineers reviewing the 74AHC574D,112 datasheet, 74AHC574D,112 pinout, 74AHC574D,112 application, or 74AHC574D,112 equivalent, key selection criteria include its CMOS input compatibility, 3-state output enable timing (t_en = 4.2 ns typ), edge-triggered register behavior, and SO20 package thermal performance up to 125 °C.

Technical Context

This device implements eight independent D-type flip-flops sharing a common clock (CP) and output enable (OE) control. Each flip-flop captures the logic state of its D-input on the LOW-to-HIGH transition of CP, meeting setup (t_su = 3.0 ns min at 5 V) and hold (t_h = 1.5 ns min) requirements. OE is active-LOW and does not affect internal state retention.

The 3-state outputs support bidirectional bus driving with high-impedance disable (I_OZ ≤ ±0.25 μA at V_CC = 5.5 V), while Schmitt-trigger inputs provide noise immunity and balanced rise/fall propagation delays (t_PLH ≈ t_PHL). Input voltage tolerance to 5.5 V enables level translation between 3.3 V and 5 V domains without external circuitry.

Key Specifications

Pinout & Package

74AHC574D,112 is supplied in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. The package is RoHS-compliant, surface-mountable, and rated for reflow per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHC574D,112, the 74AHCT574D,112 offers TTL input thresholds for legacy compatibility but sacrifices 3.3 V native operation, while SN74LVC574APW achieves faster speed and lower voltage operation at the cost of 5 V tolerance and package footprint - making the AHC variant the sole choice for mixed-voltage industrial bus latching.

Availability

74AHC574D,112 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, address/data bus latching, and industrial serial interface buffering requiring stable component supply across extended temperature ranges.

Supply support for 74AHC574D,112 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 delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, automotive, and consumer applications.

The 74AHC series targets general-purpose high-speed CMOS logic with wide supply range and robust noise immunity, specifically engineered for bus-oriented data capture and level translation in harsh industrial environments.

FAQ

Can 74AHC574D,112 operate reliably at 3.3 V with 5 V-tolerant inputs?

Yes. The device is fully specified from 2.0 V to 5.5 V, and its inputs tolerate up to 5.5 V regardless of V_CC. At 3.3 V supply, it delivers guaranteed VOH ≥ 2.58 V and VOL ≤ 0.36 V while driving 4 mA loads, satisfying 3.3 V LVTTL and LVCMOS logic thresholds. Input hysteresis further ensures noise rejection in mixed-signal environments.

What is the maximum clock frequency supported at 5 V with 50 pF load?

At V_CC = 4.5–5.5 V and C_L = 50 pF, the maximum operating frequency is 75 MHz (min) with 115 MHz typical. This is derived from t_pd = 13.5 ns max and t_W = 5.0 ns min pulse width, allowing reliable operation in high-speed data acquisition and bus multiplexing applications up to this rate.

How does the 3-state output enable (OE) interact with the internal flip-flop state?

OE is purely an output gate control: when HIGH, all Q outputs enter high-impedance mode without altering the stored data in any flip-flop. Internal states remain preserved and unaffected by OE transitions. This allows seamless bus sharing where multiple devices can be enabled/disabled without disrupting register contents or requiring re-latching.

Is thermal derating required for continuous operation at +125 °C ambient?

Yes. For the SO20 package (SOT163-1), total power dissipation derates linearly at 12.3 mW/K above +109 °C. At +125 °C ambient, P_tot must be limited to ≤ 290 mW (500 mW − 12.3 mW/K × 16 K). This requires careful layout with thermal vias and copper pour, especially when driving 8 outputs at full load near V_CC = 5.5 V.