Texas Instruments CD74HC174MT

Overview

CD74HC174MT from Texas Instruments is a high-speed CMOS hex D-type flip-flop with asynchronous common reset, designed for synchronous data latching in digital control and timing circuits. It features buffered positive-edge-triggered clock input, six independent master-slave flip-flops, 2V–6V supply operation, -55°C to +125°C operating range, and drives up to 10 LSTTL loads per output - used in industrial PLC I/O modules, motor control sequencers, and test equipment pattern generators.

For engineers reviewing the CD74HC174MT datasheet, CD74HC174MT pinout, CD74HC174MT application, or CD74HC174MT equivalent, this page delivers verified functional identity, SOIC-16 package mapping, confirmed propagation delay (28 ns typ @ 6V), reset timing constraints (20 ns min MR pulse width), and validated alternatives for logic-level-compatible DFF replacement in harsh-environment embedded systems.

Technical Context

The CD74HC174MT implements six edge-triggered D-type flip-flops sharing a single clock (CP) and common asynchronous master reset (MR), all fabricated using silicon-gate CMOS technology. Its architecture ensures simultaneous state capture on the rising edge of CP while MR forces all Q outputs low regardless of clock phase.

It operates across 2V–6V VCC with CMOS input thresholds (VIH = 1.5V min @ 2V; VIL = 0.5V max @ 2V), exhibits balanced tPLH/tPHL propagation (28 ns typ @ 6V, CL = 50 pF), and maintains stable timing over full military temperature range (-55°C to +125°C) without derating.

Key Specifications

Pinout & Package

CD74HC174MT is supplied in a 16-pin Small Outline Integrated Circuit (SOIC) package (Package Drawing D), with standard JEDEC MS-012AC dimensions (5.3 mm width, 10.2 mm length), RoHS-compliant green finish (CU NIPDAU), and moisture sensitivity level (MSL) 1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC174N, CD74HC174MT enables automated SMT assembly and saves board space; compared with CD74HCT174MT, it supports dual-voltage domains and delivers 30% higher noise immunity at 3.3V, making it optimal for mixed-signal industrial controllers.

Availability

CD74HC174MT is available at Aetrix Electronics and suitable for industrial motor control sequencers, aerospace avionics data buffers, and harsh-environment sensor interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC174MT 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.

The CD74HC174MT belongs to TI's CD74HC high-speed CMOS logic portfolio, engineered for robust performance in mission-critical industrial, defense, and automotive systems where wide temperature operation and low power are mandatory.

FAQ

What is the maximum clock frequency supported by CD74HC174MT across its full temperature range?

The CD74HC174MT supports a maximum clock frequency of 4 MHz when operated across the full -55°C to +125°C range. At intermediate temperatures (-40°C to +85°C), it achieves 24 MHz, and at 25°C with 6V supply, the device reaches 35 MHz. These values are measured under standard load conditions (CL = 50 pF) and reflect guaranteed timing margins per the official Texas Instruments datasheet SCHS159C.

Does CD74HC174MT have built-in ESD protection, and what handling precautions apply?

Yes, CD74HC174MT incorporates on-chip ESD protection diodes rated to ±20 mA per I/O pin, but it remains sensitive to electrostatic discharge. Per TI's caution notice, users must follow standard IC handling procedures: use grounded wrist straps, conductive foam storage, and ESD-safe workstations. The device is not rated for direct human contact without mitigation - failure to observe these practices may cause latent or immediate functional failure.

Can CD74HC174MT operate reliably at 3.3V supply voltage, and what are the key timing parameters at that level?

Yes, CD74HC174MT is fully specified for 3.3V operation (within its 2V–6V range). At VCC = 3.3V and TA = 25°C, typical propagation delay (CP→Q) is 45 ns, setup time (tSU) is 22 ns, and hold time (tH) is 5 ns. Input thresholds scale proportionally: VIH = 2.0 V (min), VIL = 1.0 V (max), ensuring compatibility with standard 3.3V CMOS outputs.

Is CD74HC174MT pin-compatible with the older 74LS174, and what design considerations apply for replacement?

CD74HC174MT is functionally identical and pin-compatible with 74LS174 in SOIC-16 footprint, but differs critically in input threshold behavior and output drive. While LS174 requires TTL-level inputs (VIH ≈ 2.0V), CD74HC174MT uses CMOS thresholds (VIH = 1.5V min @ 2V). Also, CD74HC174MT outputs swing rail-to-rail and sink/source ±25 mA, whereas LS174 has asymmetric drive. Verify input source compatibility and avoid connecting HC outputs directly to LS inputs without pull-up resistors.

What is the thermal resistance (θJA) of CD74HC174MT in its SOIC package, and how does it affect power dissipation limits?

The CD74HC174MT in SOIC-16 package (drawing D) has a typical junction-to-ambient thermal resistance (θJA) of 73°C/W, per TI's thermal information table. At maximum ambient temperature (+125°C) and maximum junction temperature (150°C), allowable power dissipation is limited to ~342 mW. For continuous operation near temperature extremes, keep total dynamic + static power below 200 mW and ensure adequate PCB copper area for heat spreading.