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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

STMicroelectronics M74HCT74TTR

Name: M74HCT74TTR
Brand: STMicroelectronics
SKU: M74HCT74TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M74HCT74TTR

Manufacturer:: STMicroelectronics

Category:: Flip Flops

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: M74HCT74TTR.pdf

Description:: IC FF D-TYPE DUAL 1BIT 14TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M74HCT74TTR from STMicroelectronics is a high-speed CMOS dual D-type flip-flop with asynchronous preset and clear, designed for edge-triggered synchronous logic in TTL-compatible digital systems. It operates at up to 48 MHz (typ.) at V_CC = 4.5 V, features balanced propagation delays (t_PLH ≅ t_PHL), symmetrical output drive (±4 mA), and supports industrial temperature range (–55 °C to +125 °C). Used in clocked data latching, state machine control, and bus interface synchronization.

For engineers reviewing the M74HCT74TTR datasheet, M74HCT74TTR pinout, M74HCT74TTR application, or M74HCT74TTR equivalent, key selection criteria include its 14-pin TSSOP package, dual independent DFFs with asynchronous set/reset, guaranteed 4.5–5.5 V operation, TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), and low quiescent current (I_CC ≤ 2 µA at 25 °C).

Technical Context

The M74HCT74TTR implements two independent positive-edge-triggered D flip-flops, each with active-low asynchronous preset (PR) and clear (CLR) inputs that override clock and data. Its silicon gate C2MOS process ensures compatibility with TTL-level signals while maintaining CMOS power efficiency.

Propagation delay is tightly matched between rising and falling edges (t_PLH/t_PHL ≤ 50 ns max at V_CC = 4.5 V), and output impedance is symmetrical (|I_OH| = I_OL ≥ 4 mA), enabling robust driving of capacitive loads and fan-out to multiple CMOS/TTL inputs without skew-induced timing violations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - Ensures stable operation across standard 5 V supply rails with ±10% tolerance.
f_MAX	48 MHz (typ.) at V_CC = 4.5 V - Supports high-speed data sampling and clock domain transfer in real-time control logic.
t_PLH/t_PHL	21–50 ns (max) - Enables precise setup/hold timing margins in synchronous pipelines with minimal clock-to-Q skew.
I_OH/I_OL	≥ 4 mA - Drives ≥10 LS-TTL loads or ≥20 HCMOS inputs without external buffering.
I_CC (quiescent)	≤ 2 µA at 25 °C - Allows use in low-power standby modes without significant battery drain.
Operating Temp	–55 °C to +125 °C - Qualified for automotive engine control units, industrial PLCs, and aerospace avionics.
V_IH/V_IL	≥ 2.0 V / ≤ 0.8 V - Directly interfaces legacy 5 V TTL logic without level-shifting circuitry.

Pinout & Package

Package: 14-lead TSSOP (Thin Shrink Small Outline Package), 4.9 × 6.4 mm body, 0.65 mm pitch, lead-free and RoHS-compliant per STMicroelectronics specification.

Pin/Terminal	Circuit Role	Design Meaning
1, 13	1CLR, 2CLR	Active-low asynchronous reset - forces Q = L, Q̄ = H independently of clock or D input.
2, 12	1D, 2D	Data input - sampled on rising clock edge and transferred to Q output.
3, 11	1CK, 2CK	Positive-edge-triggered clock - initiates synchronous data capture only on LOW-to-HIGH transition.
4, 10	1PR, 2PR	Active-low asynchronous preset - forces Q = H, Q̄ = L independently of clock or D input.
5, 9	1Q, 2Q	True output - reflects stored D value after clock edge or asynchronous PR/CLR assertion.
6, 8	1Q̄, 2Q̄	Inverted output - complementary to Q, enabling direct implementation of toggle or JK-like behavior.
7	GND	Ground reference - must be connected to system 0 V plane with low-impedance path to minimize noise coupling.
14	V_CC	Positive supply - decoupling capacitor (100 nF ceramic) required within 5 mm of pin for stable AC operation.

Key Features

Feature	Design Value
TTL-compatible inputs	V_IH ≥ 2.0 V and V_IL ≤ 0.8 V enable direct connection to 74LS/74ALS families without pull-ups or level shifters.
Asynchronous control	Independent PR and CLR pins per flip-flop allow immediate state initialization or reset without waiting for clock edge.
Balanced propagation	t_PLH ≅ t_PHL minimizes duty cycle distortion when used in clock division or pulse shaping circuits.
Low power consumption	2 µA max I_CC at 25 °C enables integration into always-on monitoring subsystems with microamp-level budget constraints.
Wide temperature range	–55 °C to +125 °C operation supports deployment in under-hood automotive ECUs and outdoor industrial controllers.

Applications

Industrial PLC I/O Expansion

Automotive Body Control Module

Use Scenario: Latching sensor status (e.g., door open/closed, seatbelt fastened) across noisy vehicle harnesses with long cable runs.

IC Role / Device Role / Timing Role: Dual DFF acts as synchronized input debouncer and metastability filter, capturing mechanical switch states on clean clock edges.

Use Value: Asynchronous CLR/PR allows hardware-initiated fault recovery; TTL compatibility eliminates need for external translators in legacy 5 V MCU designs.

Use Scenario: Generating timed window control pulses (e.g., power window up/down duration, mirror fold/unfold sequence).

IC Role / Device Role / Timing Role: One DFF stages enable signal; second DFF times pulse width using feedback or external counter clock.

Use Value: Matched t_PLH/t_PHL ensures consistent on/off timing; 125 °C rating sustains reliability near HVAC ducts or headlight assemblies.

Medical Infusion Pump Controller

Test Equipment Digital Pattern Generator

Use Scenario: Capturing safety-critical actuator commands (e.g., motor start/stop, valve open/close) with deterministic latency.

IC Role / Device Role / Timing Role: Synchronizes asynchronous microcontroller GPIO outputs to system clock domain before driving isolation drivers.

Use Value: Guaranteed 48 MHz f_MAX supports sub-microsecond response; low I_CC reduces thermal load in sealed enclosures.

Use Scenario: Building programmable logic sequences for stimulus generation in boundary-scan or functional test fixtures.

IC Role / Device Role / Timing Role: Forms basic shift register or state register stage in custom pattern engines where pin count and speed are constrained.

Use Value: TSSOP-14 footprint saves PCB area vs. DIP/SO-14; symmetrical drive strength ensures clean waveform edges into 50 Ω test loads.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT74DR	Same logic function, SOIC-14 package; slightly higher max I_CC (4 µA vs. 2 µA) and lower f_MAX (36 MHz typ. at 4.5 V).	SOIC footprint requires larger board area; better suited for prototyping or through-hole assembly.	Select when SOIC handling or legacy board compatibility is prioritized over space-constrained layouts.
74LVC74AD,118	3.3 V only (1.65–3.6 V); faster t_PLH/t_PHL (2.5 ns typ.); no TTL input compatibility (V_IH = 2.0 V min only at V_CC = 3.3 V).	Requires level translation for 5 V systems; optimized for modern low-voltage FPGAs and microcontrollers.	Select only in new 3.3 V designs where power and speed outweigh legacy interface needs.

Compared with SN74HCT74DR and 74LVC74AD,118, the M74HCT74TTR uniquely balances 5 V TTL interoperability, ultra-low quiescent current, and TSSOP space efficiency-making it optimal for cost-sensitive, thermally constrained, and mixed-voltage industrial control modules.

Availability

M74HCT74TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical infusion pump controllers, and test equipment digital pattern generators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HCT74TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power discrete solutions with vertical manufacturing capabilities and broad analog/mixed-signal IP.

The M74HCT74TTR belongs to ST's legacy HCT logic family, engineered specifically for seamless 5 V TTL-to-CMOS interfacing in mission-critical industrial and automotive control systems where reliability and voltage compatibility are non-negotiable.

FAQ

Is M74HCT74TTR pin-compatible with standard 74LS74 devices?

Yes, M74HCT74TTR is pin- and function-compatible with 74LS74 and other 74-series dual D-type flip-flops in the same 14-pin TSSOP package. Its pinout matches the industry-standard arrangement for dual DFFs, including identical placement of V_CC, GND, CLK, D, PR, CLR, Q, and Q̄ terminals. No PCB redesign is needed when upgrading from LS to HCT technology.

What is the maximum capacitive load this device can drive reliably?

M74HCT74TTR guarantees 4 mA output drive (I_OL/|I_OH|) into resistive loads, supporting up to 50 pF total load capacitance with specified AC performance (t_PLH, t_PHL, f_MAX). For heavier loads (>50 pF), propagation delays increase linearly; design margin requires derating f_MAX by ~10 MHz per additional 20 pF beyond CL = 50 pF.

Does this part support hot insertion or live insertion into powered backplanes?

No, M74HCT74TTR is not hot-plug rated. Its absolute maximum ratings specify VI and VO limits relative to GND and V_CC, and no built-in current-limiting or precharge circuitry is provided. Applying V_CC or signals before establishing GND connection risks latch-up or permanent damage due to uncontrolled current paths through internal protection diodes.

Can both preset and clear be asserted simultaneously on the same flip-flop?

Yes, asserting both PR and CLR low simultaneously results in an undefined output state (Q and Q̄ may both go high briefly), but the device recovers predictably upon release: the next clock edge determines final Q state based on D input. This condition is electrically safe and does not damage the IC, though system-level logic should avoid simultaneous assertion to prevent transient glitches.

M74HCT74TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74HCT

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Set(Preset) and Reset

Type:: D-Type

Output Type:: Complementary

Number of Elements:: 2

Number of Bits per Element:: 1

Clock Frequency:: 48 MHz

Max Propagation Delay @ V, Max CL:: 33ns @ 4.5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 4mA, 4mA

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 2 µA

Input Capacitance:: 5 pF

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

M74HCT74TTR FAQ

1.How can I place an order for M74HCT74TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for M74HCT74TTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for M74HCT74TTR reliable?

The price and inventory of M74HCT74TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HCT74TTR is usually 5 days.

3.What payment methods are accepted for M74HCT74TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HCT74TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M74HCT74TTR?

M74HCT74TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M74HCT74TTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for M74HCT74TTR?

For technical support, including M74HCT74TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HCT74TTR requirements.

6.How does Aetrix verify that M74HCT74TTR is sourced from the original manufacturer or authorized distributors?

All M74HCT74TTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M74HCT74TTR meets industry standards.

7.What is the process for return or replacement of M74HCT74TTR?

All M74HCT74TTR units undergo pre-shipment inspection (PSI). If there is an issue with M74HCT74TTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The M74HCT74TTR part is unused and in its original packaging.

Return procedure for M74HCT74TTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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