Texas Instruments CD74ACT574M

Overview

CD74ACT574M from Texas Instruments is an octal D-type, 3-state, positive-edge-triggered flip-flop in SOIC-20 package, operating at 4.5–5.5 V with 2.9 ns typical clock-to-Q propagation delay, ±24 mA output drive, and -55°C to +125°C extended temperature range - used for bus interface latching in industrial control and data acquisition systems.

For engineers reviewing the CD74ACT574M datasheet, CD74ACT574M pinout, CD74ACT574M application, or CD74ACT574M equivalent, this page delivers verified functional identity, validated SOIC-20 pin mapping, confirmed ACT-series timing and drive specs, and two rigorously cross-referenced alternative parts for bus-hold and high-speed logic design.

Technical Context

The CD74ACT574M implements eight independent D-type latches synchronized to the rising edge of CLK, with asynchronous 3-state output control via active-low OE. Its RCA Advanced CMOS process ensures SCR-latchup resistance and balanced propagation delays across all eight channels.

It operates strictly within 4.5–5.5 V supply range, supports TTL-compatible inputs (VIH = 2 V min, VIL = 0.8 V max), delivers VOH ≥ 3.7 V at -24 mA and VOL ≤ 0.5 V at +24 mA, and meets 50 Ω transmission-line drive capability per output at +85°C.

Key Specifications

Pinout & Package

CD74ACT574M is supplied in a 20-pin SOIC (DW) package with 12.80 mm × 10.30 mm footprint, 12.80 mm × 7.50 mm body size, and 2.65 mm max height. Pin 1 is located at top-left corner with quadrants aligned per JEDEC MS-013.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT574N and CD74AC574M, CD74ACT574M offers optimal speed/power trade-off in surface-mount industrial designs - its SOIC-20 footprint enables higher density, while ACT-specific 4.5–5.5 V compliance ensures compatibility with regulated 5 V rails without derating.

Availability

CD74ACT574M is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive ECU interfaces, and avionics data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74ACT574M 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families and industrial-grade qualification.

CD74ACT574M belongs to TI's CD74ACT series - engineered for high-speed, noise-immune 5 V digital interfacing in harsh environments, emphasizing latch stability, bus drive strength, and extended temperature resilience.

FAQ

What is the maximum clock frequency supported by CD74ACT574M?

The CD74ACT574M supports a maximum clock frequency of 125 MHz at TA = -40°C to +85°C and 110 MHz at TA = -55°C to +125°C, based on fMAX specifications in the official TI datasheet SCHS292A. This performance derives from its 2.9 ns typical propagation delay and 3.9 ns minimum clock pulse width at 5 V. The CD74ACT574M must be operated within these limits to guarantee setup/hold timing compliance and avoid metastability.

Does CD74ACT574M support 3.3 V operation?

No, CD74ACT574M does not support 3.3 V operation. Its recommended operating supply voltage is strictly 4.5 V to 5.5 V, as defined in Section 4.3 of the TI datasheet SCHS292A. Attempting to power CD74ACT574M at 3.3 V will result in undefined logic behavior, failure to meet AC timing specs, and potential output drive degradation. For 3.3 V systems, consider the AC-family variant CD74AC574M instead.

What is the purpose of the OE pin on CD74ACT574M?

The OE (Output Enable) pin on CD74ACT574M is an active-low control that places all eight Q outputs into high-impedance state when asserted high, and enables normal output driving when pulled low. This function allows CD74ACT574M to share a common data bus with other devices without contention. OE operates independently of the clock and latch operation, enabling dynamic bus arbitration in real-time systems.

Is CD74ACT574M pin-compatible with CD74AC574M?

Yes, CD74ACT574M is pin-compatible with CD74AC574M - both use identical SOIC-20 (DW) packaging and share identical pin configuration, numbering, and terminal functions per TI's Device Information table and Pin Configuration Figure 3-1. However, they differ electrically: CD74ACT574M requires 4.5–5.5 V supply and delivers faster timing, while CD74AC574M supports 1.5–5.5 V but has slower propagation delays. Swapping requires verifying supply and timing margins.

What thermal considerations apply to CD74ACT574M in SOIC-20 package?

CD74ACT574M in SOIC-20 (DW) package has a junction-to-ambient thermal resistance (RθJA) of 101.2°C/W, per TI's Thermal Information Table 4.4. At full 5.5 V operation with all outputs sinking 24 mA, power dissipation may exceed 100 mW - requiring adequate PCB copper area, thermal vias, or airflow to maintain junction temperature below 125°C. Derating is mandatory above 70°C ambient to ensure reliability over lifetime.