Texas Instruments CD74HC374M

Overview

CD74HC374M from Texas Instruments is a high-speed CMOS octal D-type flip-flop with 3-state outputs, positive-edge clock triggering, and common output enable control. It operates from 2 V to 6 V, delivers 15 ns typical propagation delay at 5 V/15 pF, supports –55°C to 125°C operation, and drives up to 15 LSTTL loads - used in bus-hold data latching and address/data buffering in industrial control logic.

For engineers reviewing the CD74HC374M datasheet, CD74HC374M pinout, CD74HC374M application, or CD74HC374M equivalent, key selection criteria include its 3-state output architecture, SOIC-20 package compatibility, wide temperature range, HC-series voltage flexibility (2–6 V), and precise setup/hold timing requirements for synchronous bus interfacing.

Technical Context

The CD74HC374M implements eight independent edge-triggered D flip-flops sharing one clock (CP) input and one active-low output enable (OE) signal. Data is latched on the LOW-to-HIGH transition of CP; OE controls high-impedance state independently of register operation. Its HC logic family ensures CMOS-level input thresholds and rail-to-rail output swing.

It features buffered inputs, balanced propagation delay and transition times, and fanout capability of 10 standard TTL loads or 15 bus-driver TTL loads. The device is not compatible with LSTTL input logic levels unless operated as HCT variant - this part is strictly HC-type, requiring VIH ≥ 3.15 V at VCC = 4.5 V.

Key Specifications

Pinout & Package

CD74HC374M is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard JEDEC MS-013 footprint and gull-wing leads. Pinout follows the HC(T)374 configuration per TI's SCHS183E datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC374N and CD74HCT374M, the CD74HC374M offers optimal surface-mount density and 2–6 V flexibility, while avoiding unnecessary TTL compatibility overhead or larger through-hole packaging - ideal for space-constrained, multi-rail embedded systems.

Availability

CD74HC374M is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC374M 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The CD74HC374M belongs to TI's legacy HC logic portfolio, designed specifically for robust, low-power, wide-temperature digital interfacing and data latching in mission-critical control systems.

FAQ

What is the maximum clock frequency supported by CD74HC374M?

The CD74HC374M supports up to 60 MHz maximum clock frequency when loaded with 15 pF and operated at VCC = 5 V, as specified in the switching characteristics table. At VCC = 6 V and CL = 15 pF, fMAX drops to 23 MHz due to increased propagation delay. System-level timing must account for setup (tSU = 10 ns min) and hold (tH = 5 ns min) requirements relative to the clock edge.

Does CD74HC374M support 3.3 V operation?

Yes, CD74HC374M fully supports 3.3 V operation within its rated 2–6 V supply range. At VCC = 3.3 V, VIH is guaranteed ≥ 2.31 V and VIL ≤ 0.99 V, ensuring compatibility with standard 3.3 V CMOS logic families. Propagation delay increases to ~25 ns typical, and maximum clock frequency reduces to ~35 MHz with 15 pF load.

How does the output enable (OE) pin behave on CD74HC374M?

On CD74HC374M, the OE pin is active-low: when OE = LOW, Q0–Q7 outputs reflect registered data; when OE = HIGH, all eight outputs enter high-impedance state regardless of clock or input conditions. This behavior is asynchronous and immediate - output disable time (tPHZ/tPLZ) is 23–35 ns depending on VCC and temperature.

Can CD74HC374M replace CD74HCT374M in an existing design?

No - CD74HC374M cannot directly replace CD74HCT374M without circuit review. While pinout and function match, the HC version requires higher VIH (≥3.15 V at 4.5 V) versus HCT's TTL-compatible 2 V threshold. If upstream drivers output only 2.4 V logic highs, CD74HC374M may fail to register valid HIGH inputs reliably.

What thermal considerations apply to CD74HC374M in SOIC-20 package?

CD74HC374M in SOIC-20 (DW) package has RθJA = 109.1°C/W. At 125°C ambient and 5 V operation, maximum allowable power dissipation is ~270 mW before junction exceeds 150°C. Layout must include thermal vias under the exposed pad (if present) and minimize trace resistance to GND/VCC; recommended 0.1 µF bypass capacitor placement within 3 mm of pins 10 and 20.