Texas Instruments CD74HCT175MT

Overview

CD74HCT175MT from Texas Instruments is a high-speed CMOS quad D-type flip-flop with asynchronous master reset, operating at 4.5V–5.5V, featuring complementary Q/Q̅ outputs per stage, positive-edge clock triggering, and guaranteed operation from –55°C to +125°C. It drives up to 10 LSTTL loads and supports synchronous data latching in industrial control sequencers and digital instrumentation.

For engineers reviewing the CD74HCT175MT datasheet, CD74HCT175MT pinout, CD74HCT175MT application, or CD74HCT175MT equivalent, key selection criteria include its LSTTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), 16-pin SOIC package, 25 MHz max clock frequency at 4.5 V, and deterministic asynchronous reset behavior independent of clock edge timing.

Technical Context

This device implements four independent edge-triggered D-type flip-flops sharing one common clock (CP) and one active-low asynchronous master reset (MR). Each stage transfers the D-input state to Q on the rising edge of CP while simultaneously asserting the inverse on Q̅, with MR forcing all Q outputs low and all Q̅ outputs high regardless of CP state.

Designed for mixed-logic interfacing, the CD74HCT175MT uses HCT-series silicon-gate CMOS technology to achieve TTL-level input compatibility without requiring external level-shifting, while maintaining CMOS advantages including low quiescent current (≤160 µA over full temperature range) and high noise immunity (NIL/NIH = 30% of VCC).

Key Specifications

Pinout & Package

CD74HCT175MT is housed in a 16-lead small-outline integrated circuit (SOIC) package with standard JEDEC MS-012AC dimensions (width: 3.9 mm, body length: 9.9 mm, lead pitch: 1.27 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT175N and CD74HCT175M96, the CD74HCT175MT offers identical logic functionality and DC/AC performance in a small-reel SOIC format ideal for design validation, pilot runs, and programs requiring traceable small-batch sourcing without committing to full production reels.

Availability

CD74HCT175MT is available at Aetrix Electronics and suitable for industrial sequencers, avionics data buffers, and military radio control logic requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD74HCT175MT 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 ICs, with decades of heritage in high-reliability military and aerospace components.

The CD74HCT175MT belongs to TI's CD74HCT high-speed CMOS logic family, engineered specifically for seamless integration between TTL and CMOS systems in harsh-environment applications demanding wide temperature operation and deterministic timing behavior.

FAQ

What is the maximum clock frequency supported by the CD74HCT175MT?

The CD74HCT175MT supports a maximum clock frequency of 25 MHz at VCC = 4.5 V, derating to 20 MHz at VCC = 4.5 V over the full –55°C to +125°C operating range. This specification is verified under CL = 50 pF load conditions and accounts for worst-case propagation delay (tPLH/tPHL ≤ 50 ns) and setup/hold timing margins.

Does the CD74HCT175MT require external pull-up or pull-down resistors on its inputs?

No, the CD74HCT175MT does not require external pull-up or pull-down resistors on MR, CP, or D inputs due to its buffered CMOS inputs with defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds. However, floating inputs must be avoided - unused D inputs should be tied to VCC or GND, and MR must be actively driven or pulled high via a resistor if not controlled by logic.

Can the CD74HCT175MT operate reliably at 3.3 V supply voltage?

No, the CD74HCT175MT is specified only for 4.5 V to 5.5 V operation and is not guaranteed to function correctly at 3.3 V. For 3.3 V systems, consider the CD74HC175M96 (HC-family, 2 V–6 V) or SN74LVC175A (LVC-family, 1.65 V–3.6 V), both offering compatible quad D-type functionality with reset.

What is the meaning of the "T" suffix in CD74HCT175MT?

The "T" suffix in CD74HCT175MT indicates a small-quantity tape-and-reel packaging option containing 250 units per reel, designed for engineering validation, low-volume production, and prototype builds. It uses the same SOIC-16 (D) package and electrical specifications as the standard CD74HCT175M and bulk-reel CD74HCT175M96 variants.

How does the asynchronous reset (MR) behave during power-up sequencing?

The CD74HCT175MT's MR pin is active-low and asynchronous: when MR is held low during VCC ramp-up, all Q outputs remain at logic 0 and all Q̅ outputs at logic 1 until MR transitions high. To ensure predictable initial state, MR should be held low until VCC stabilizes above 4.5 V, then released - this guarantees known outputs before first clock edge.