Texas Instruments SN74AHC374PW

Overview

SN74AHC374PW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface applications requiring controlled drive strength and low-output ringing. It operates from 2 V to 5.5 V, supports 8-bit parallel data latching on CLK rising edge, and features output-enable (OE) control for high-impedance bus isolation-used in server motherboards and network switches.

For engineers reviewing the SN74AHC374PW datasheet, SN74AHC374PW pinout, SN74AHC374PW application, or SN74AHC374PW equivalent, key selection criteria include its 3-state output drive capability (±25 mA), 5.5 V-tolerant inputs, 116.8 °C/W junction-to-ambient thermal resistance in TSSOP-20, and compatibility with 3.3 V and 5 V logic systems.

Technical Context

The SN74AHC374PW implements eight independent D-type latches synchronized to the rising edge of CLK, with a shared OE input enabling simultaneous 3-state control of all eight Q outputs. Its CMOS design ensures balanced rise/fall times and reduced output ringing-critical for driving capacitive bus loads without external termination.

Input voltage tolerance up to 5.5 V allows level translation from higher-voltage logic domains into 2–5.5 V VCC systems. The device's functional modes are defined by OE (active-low enable) and CLK transitions, with no internal feedback or clock gating-operating strictly as a transparent edge-triggered register with tri-state output control.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 0.65 mm lead pitch, surface-mount, RoHS-compliant, moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHC374PW, SN74AHCT374PW offers TTL-compatible thresholds but lacks 5.5 V input tolerance, while SN74LVC374APW delivers superior speed and drive at 3.3 V but cannot operate above 3.6 V-making SN74AHC374PW uniquely suitable for mixed-voltage 2–5.5 V bus interfaces.

Availability

SN74AHC374PW is available at Aetrix Electronics and suitable for server motherboard design, network switch control logic, and motor control interface circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74AHC374PW 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 for industrial, automotive, and communications markets.

The SN74AHC374PW belongs to TI's advanced high-speed CMOS (AHC) logic family, engineered for robust bus-interface applications demanding wide supply range, 3-state control, and noise-immune signal integrity.

FAQ

What is the maximum clock frequency supported by SN74AHC374PW?

The SN74AHC374PW supports up to 110 MHz maximum operating frequency at VCC = 5 V with CL = 50 pF load, and 70 MHz at VCC = 3.3 V under the same conditions. These values derive from measured fMAX specifications in the official datasheet and assume proper layout, decoupling, and signal integrity practices.

Does SN74AHC374PW support 5 V logic inputs when powered from 3.3 V?

Yes, SN74AHC374PW supports input voltages up to 5.5 V regardless of VCC level-including when VCC = 3.3 V. This overvoltage tolerance enables direct interfacing with 5 V peripherals without external level shifters, a confirmed feature documented in Section 7.3 of the datasheet.

What is the thermal performance of SN74AHC374PW in its TSSOP-20 package?

SN74AHC374PW in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (RθJA) of 116.8 °C/W under standard JEDEC PCB conditions. This value is critical for calculating allowable power dissipation and ensuring reliability in enclosed or thermally constrained industrial enclosures.

How does the output-enable (OE) function behave on SN74AHC374PW?

OE is an active-low input: when low, all eight Q outputs drive their latched logic states; when high, all Q outputs enter high-impedance (Hi-Z) state. This behavior is confirmed in Table 7-1 (Function Table) and Figure 4-1 of the SN74AHC374PW datasheet, enabling clean bus arbitration without contention.

Is SN74AHC374PW suitable for automotive applications?

SN74AHC374PW is rated for –40 °C to +125 °C operating temperature and meets JESD17 latch-up and JESD22 ESD standards-making it suitable for under-hood and infotainment applications where extended temperature and robustness are required, though it is not AEC-Q100 qualified unless explicitly marked as such in TI's automotive-grade ordering variants.