Texas Instruments SN74AHC374DW

Overview

SN74AHC374DW 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 high-impedance isolation. It operates from 2 V to 5.5 V, supports 8-bit parallel data latching on CLK rising edge, and delivers ±25 mA output drive per channel at V_CC = 5 V - enabling direct connection to capacitive or low-impedance bus lines in server motherboards and network switches.

For engineers reviewing the SN74AHC374DW datasheet, SN74AHC374DW pinout, SN74AHC374DW application, or SN74AHC374DW equivalent, key selection criteria include its 20-pin SOIC (DW) package, 3-state output enable control, 5.5 ns minimum clock pulse width at 5 V, and input overvoltage tolerance up to 5.5 V independent of V_CC.

Technical Context

The SN74AHC374DW implements eight independent D-type latches synchronized to the rising edge of CLK, with a shared active-low Output Enable (OE) controlling all eight outputs simultaneously. Its CMOS AHC logic family ensures rail-to-rail output swing, balanced rise/fall times, and low dynamic power consumption - critical for noise-sensitive digital interfaces.

Each channel features input overvoltage tolerance (up to 5.5 V), slow-edge-rate design to suppress output ringing, and latch-up immunity exceeding 250 mA per JESD17. The device supports bidirectional bus driving when paired with complementary devices and maintains stable timing across –40°C to +125°C ambient operation.

Key Specifications

Pinout & Package

SN74AHC374DW uses a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body size 12.8 mm × 7.5 mm), optimized for automated assembly and thermal performance in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHC374DW, SN74AHCT374DW offers faster timing but sacrifices input overvoltage tolerance, while 74LVC374APW reduces power and voltage headroom at the cost of 5 V compatibility - making SN74AHC374DW the optimal choice for robust, mixed-voltage bus interface designs.

Availability

SN74AHC374DW is available at Aetrix Electronics and suitable for server motherboard I/O expansion, industrial network switch interface, and motor control feedback register applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for SN74AHC374DW 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 connectivity technologies with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74AHC374DW belongs to TI's AHC logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing - specifically targeting bus buffering, I/O port expansion, and register-based control in noise-sensitive and thermally constrained environments.

FAQ

What is the operating temperature range for SN74AHC374DW?

The SN74AHC374DW is specified for operation from –40°C to +125°C ambient temperature. This extended industrial range ensures reliable performance in server motherboards, network switches, and motor control systems exposed to elevated thermal environments. All electrical characteristics in the datasheet are validated across this full range, with timing parameters such as t_su and t_PLH guaranteed at both extremes.

Does SN74AHC374DW support 5 V-tolerant inputs when powered at 3.3 V?

Yes, SN74AHC374DW supports input voltages up to 5.5 V regardless of V_CC level - including when powered at 3.3 V. This overvoltage tolerance enables direct interfacing with 5 V peripherals without external level shifters, a key advantage over AHCT or LVC variants. The feature is explicitly documented in Section 7.3 and Table 5.3 of the datasheet.

What is the maximum output drive capability of SN74AHC374DW per pin?

SN74AHC374DW delivers ±25 mA continuous output current per Q pin at V_CC = 5 V, as specified in Section 5.1 Absolute Maximum Ratings. At V_CC = 3.3 V, it provides ±4 mA (I_OL/I_OH). Total device output current is limited to ±75 mA across all pins - a constraint critical for avoiding thermal overload in high-drive bus applications.

How does the 3-state output enable (OE) function in SN74AHC374DW?

In SN74AHC374DW, OE is an active-low control that simultaneously places all eight Q outputs into high-impedance (Z) state when asserted high. When OE is low, outputs reflect latched D-input values on CLK rising edges. This behavior enables seamless bus sharing in multi-master systems - for example, isolating the device from a shared data bus during CPU access cycles in network switch designs.

Is SN74AHC374DW pin-compatible with other packages in the SN74AHC374 family?

Yes, SN74AHC374DW shares identical pinout and functionality with all 20-pin variants of the SN74AHC374 family - including DB (SSOP), DGV (TVSOP), N (PDIP), PW (TSSOP), and NS (SOP). Pin functions (e.g., OE on pin 1, CLK on pin 11, GND on pin 10, V_CC on pin 20) are consistent across packages per Table 4-1 and Figure 4-1 of the datasheet, enabling drop-in replacement based on board space and thermal requirements.