Nexperia USA Inc. 74HC574DB,112

Overview

74HC574DB,112 from Nexperia is an 8-bit positive-edge-triggered D-type flip-flop with 3-state outputs in a 20-pin SSOP package (SOT339-1), operating from 2.0 V to 6.0 V supply, featuring CMOS-level inputs, 17 ns typical propagation delay at 4.5 V, and -40 °C to +125 °C temperature range - used for data latching and bus isolation in microcontroller I/O expansion circuits.

For engineers reviewing the 74HC574DB,112 datasheet, 74HC574DB,112 pinout, 74HC574DB,112 application, or 74HC574DB,112 equivalent, this device serves as a high-noise-immunity, low-power octal register for synchronous data capture and tri-state bus control in industrial PLC modules, embedded instrumentation interfaces, and digital logic subsystems requiring precise edge-triggered storage.

Technical Context

The 74HC574DB,112 implements eight independent D-type flip-flops sharing a common clock (CP) input and a single active-low output enable (OE) signal. Each flip-flop captures the logic state of its D-input on the LOW-to-HIGH transition of CP, provided setup (12 ns min at 4.5 V) and hold (5 ns min) timing requirements are met.

Its 3-state outputs support bidirectional bus architectures: OE = LOW enables non-inverting Qn outputs; OE = HIGH forces all Qn into high-impedance OFF-state without affecting internal flip-flop states. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HC574DB,112 uses the SOT339-1 package: 20-pin shrink small outline package (SSOP), 0.65 mm pitch, body width 5.3 mm, thermal performance optimized for surface-mount assembly in space-constrained industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC574DB,112, the 74HCT574DB,112 offers superior input compatibility with 5 V TTL systems but sacrifices some noise margin, while SN74HC574PWR delivers identical functionality in a thermally enhanced, footprint-optimized package - enabling layout flexibility without compromising timing or drive strength.

Availability

74HC574DB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital test equipment interface, and embedded instrumentation front-end designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC574DB,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 focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HC574 belongs to Nexperia's 74HC logic family - designed for low-power, high-noise-immunity digital interfacing in industrial control, instrumentation, and legacy bus bridging applications where reliability and wide supply tolerance are critical.

FAQ

What is the maximum clock frequency supported by the 74HC574DB,112?

The 74HC574DB,112 supports up to 112 MHz maximum clock frequency at VCC = 4.5 V and CL = 15 pF, or 30 MHz at CL = 50 pF. This is determined by propagation delay (17 ns typ), set-up time (12 ns min), and hold time (5 ns min). Real-world operation depends on load capacitance, PCB routing, and supply stability - derating by 20% is recommended for robust industrial designs.

Can the 74HC574DB,112 operate reliably at 3.3 V supply?

Yes - the 74HC574DB,112 is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, VIH is 2.31 V (70% of VCC), VIL is 0.99 V (30%), VOH is ≥2.97 V (at -6 mA), and VOL is ≤0.33 V (at 6 mA), meeting standard 3.3 V LVTTL and LVCMOS interface requirements without level shifting.

How does the OE pin behave during power-up or brown-out conditions?

The OE pin is not internally pulled - it must be actively driven LOW after VCC stabilizes to avoid undefined output states. During power-up, OE should remain HIGH (via external pull-up) until supply reaches regulation, then asserted LOW only after clocks and data are valid. Uncontrolled OE can cause bus contention or latch-up if outputs drive into floating or partially powered downstream logic.

Is the 74HC574DB,112 pin-compatible with the 74LS574?

No - while both are octal D-type flip-flops with 3-state outputs, the 74LS574 uses TTL technology with different DC characteristics (e.g., VIH = 2.0 V, but IIL = -0.4 mA vs HC's ±1 μA), higher power consumption (~30 mW vs ~0.1 mW), and no input clamp diodes. Direct replacement risks excessive loading, timing violations, and potential damage due to back-driving unprotected TTL inputs.