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

STMicroelectronics M74HCT374M1R

Name: M74HCT374M1R
Brand: STMicroelectronics
SKU: M74HCT374M1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M74HCT374M1R

Manufacturer:: STMicroelectronics

Category:: Flip Flops

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: M74HCT374M1R.pdf

Description:: IC FF D-TYPE SNGL 8BIT 20SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M74HCT374M1R from STMicroelectronics is a high-speed CMOS octal D-type flip-flop with non-inverting 3-state outputs, designed for TTL-compatible bus interfacing. It features f_MAX = 50 MHz (typ.), t_PLH/t_PHL = 30 ns (max), I_CC = 4 µA (max) at 25°C, and operates across V_CC = 4.5–5.5 V. Used in address/data latching and bus isolation in industrial control logic systems.

For engineers reviewing the M74HCT374M1R datasheet, M74HCT374M1R pinout, M74HCT374M1R application, or M74HCT374M1R equivalent, key selection criteria include 3-state output timing (t_PZL/t_PLZ ≤ 42 ns), TTL-input compatibility (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), and SO-20 package thermal performance up to +125°C.

Technical Context

The M74HCT374M1R implements eight edge-triggered D-type flip-flops sharing a common clock (CK) and active-low 3-state output enable (OE). Its C2MOS silicon gate process ensures balanced propagation delays (t_PLH ≅ t_PHL) and symmetrical output drive (|I_OH| = I_OL = 6 mA min).

Internal operation remains fully functional during 3-state output disable - data can be latched or retained regardless of OE state. Input protection circuits guard against ESD and transient overvoltage, supporting robust operation in mixed-technology digital systems interfacing HCMOS, TTL, and NMOS logic families.

Key Specifications

Parameter	Value and Actual Design Meaning
f_MAX	50 MHz typical at V_CC = 4.5 V - supports high-speed synchronous bus latching up to 20 ns clock period
t_PLH/t_PHL	30 ns max (CL = 50 pF) - ensures predictable setup/hold alignment in 8-bit parallel data paths
I_CC	4 µA max at T_A = 25°C - enables low-static-power operation in always-on control registers
V_IL/V_IH	0.8 V max / 2.0 V min - guarantees reliable recognition of TTL-level inputs without level-shifting
I_OL/\|I_OH\|	6 mA min - drives standard TTL loads (10 LSTTL units) directly from 3-state outputs
t_PZL/t_PLZ	42 ns max (RL = 1 kΩ) - defines minimum bus turnaround time for bidirectional data arbitration
Operating Temp	−55°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications

Pinout & Package

Supplied in a 20-pin Small Outline Package (SO-20), compliant with JEDEC MS-013, with 1.27 mm pitch and body dimensions 12.6 × 7.6 mm. Thermal resistance θ_JA ≈ 110°C/W (JEDEC Std 51-2).

Pin/Terminal	Circuit Role	Design Meaning
1	OE	Active-low 3-state output enable - disables all Q outputs to high impedance without affecting internal latch state
2,5,6,9,12,15,16,19	Q0–Q7	Non-inverting registered outputs - reflect D-input values sampled on CK rising edge when OE = L
3,4,7,8,13,14,17,18	D0–D7	Data inputs - sampled synchronously on CK rising edge; unaffected by OE state
11	CK	Positive-edge-triggered clock - initiates data capture from D to Q; no internal synchronization delay
10	GND	Logic ground reference - must be connected to system 0 V plane with low-inductance path
20	V_CC	+4.5 to +5.5 V supply - powers all internal logic and output drivers; decoupling capacitor required

Key Features

Feature	Design Value
TTL-compatible inputs	V_IL ≤ 0.8 V / V_IH ≥ 2.0 V - eliminates need for external level translators in legacy TTL-to-CMOS interfaces
Balanced propagation delays	t_PLH ≅ t_PHL - minimizes skew between rising/falling output transitions in synchronous bus systems
Independent OE control	OE does not affect internal flip-flop operation - allows concurrent data latching and bus release
ESD-protected inputs	±20 mA input diode current rating - withstands human-body-model ESD events up to 2 kV without external protection

Applications

Industrial PLC I/O Expansion

Automotive Body Control Module

Use Scenario: Latching sensor status and actuator commands across isolated CAN/LIN gateway buses.

IC Role / Device Role / Timing Role: Octal D-flip-flop buffers microcontroller GPIOs to drive relay drivers and LED arrays while enabling shared bus arbitration via 3-state control.

Use Value: 6 mA output drive sustains 10 LSTTL loads per channel; −55°C to +125°C rating matches under-dash thermal requirements.

Use Scenario: Isolating diagnostic data lines between infotainment head unit and door module controllers.

IC Role / Device Role / Timing Role: Synchronizing and gating bidirectional UART or LIN signals using OE-controlled 3-state outputs to prevent bus contention.

Use Value: t_PZL/t_PLZ ≤ 42 ns ensures sub-50 ns bus turnaround - critical for LIN 19.2 kbps frame timing compliance.

Test Equipment Digital Pattern Generator

Legacy Industrial Bus Interface Adapter

Use Scenario: Generating precise 8-bit parallel stimulus waveforms synchronized to external trigger clocks.

IC Role / Device Role / Timing Role: Edge-triggered data register capturing pattern data on rising CK edge; OE used to blank outputs during reconfiguration.

Use Value: 50 MHz f_MAX supports 20 ns minimum pulse width - sufficient for 50 Mbps digital test vector generation.

Use Scenario: Bridging ISA-bus peripherals to modern microcontroller-based control cards in factory automation retrofits.

IC Role / Device Role / Timing Role: Level-translating and latching 8-bit address/data lines between 5 V TTL ISA slots and 5 V CMOS host logic.

Use Value: Pin- and function-compatible with 74LS374 - enables drop-in replacement without PCB redesign or firmware changes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT374N	DIP-20 package only; identical AC/DC specs and pinout	Limited to through-hole assembly; higher θ_JA (~70°C/W) reduces power handling in dense layouts	Select for prototyping or legacy DIP-based systems requiring same logic behavior
74VHC374M	Wider V_CC range (2–5.5 V); lower I_CC (2 µA typ); faster t_PLH/t_PHL (18 ns max)	Not TTL-input compatible (V_IH = 3.5 V min); requires level shifters in mixed-voltage systems	Select for battery-powered or multi-supply designs where voltage flexibility outweighs TTL interface need

Compared with SN74HCT374N and 74VHC374M, the M74HCT374M1R uniquely balances TTL compatibility, SO-20 surface-mount suitability, and extended temperature operation - making it optimal for industrial-grade bus interface modules where reliability and legacy interoperability are mandatory.

Availability

M74HCT374M1R is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and legacy bus interface adapters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HCT374M1R 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 management ICs with broad manufacturing and quality certifications including AEC-Q100 and ISO/TS 16949.

The M74HCT374M1R belongs to ST's legacy HCT logic family, engineered specifically for seamless interoperability between TTL, NMOS, and CMOS systems in harsh-environment industrial and transportation applications.

FAQ

What is the maximum clock frequency supported by the M74HCT374M1R?

The M74HCT374M1R supports a maximum clock frequency of 50 MHz (typical) at V_CC = 4.5 V and CL = 50 pF. At worst-case conditions (−55°C to +125°C, V_CC = 4.5 V), f_MAX is guaranteed at 21 MHz. This rating assumes proper load capacitance, clean power supply decoupling, and controlled input rise/fall times ≤ 500 ns.

Can the M74HCT374M1R drive standard TTL loads directly?

Yes - each output delivers I_OL ≥ 6 mA (min) at V_OL ≤ 0.4 V and |I_OH| ≥ 6 mA (min) at V_OH ≥ 4.1 V (V_CC = 4.5 V), meeting the DC specifications of 10 LSTTL loads. Its TTL-compatible input thresholds (V_IH ≥ 2.0 V, V_IL ≤ 0.8 V) further enable direct connection without level-shifting circuitry.

How does the OE pin behave during clock transitions?

The OE pin operates asynchronously and independently of the clock: when OE = HIGH, all Q outputs enter high-impedance regardless of CK activity or internal latch state. When OE = LOW, Q outputs reflect the most recently latched D-input values on the prior CK rising edge. Internal flip-flop operation continues uninterrupted during OE assertion.

Is the M74HCT374M1R suitable for automotive applications?

Yes - it is qualified for operation from −55°C to +125°C and features ESD protection (±20 mA input diode current), making it suitable for non-safety-critical automotive applications such as body control modules and infotainment subsystems. It is not AEC-Q100 qualified, so use in safety-related systems requires additional validation per OEM requirements.

M74HCT374M1R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74HCT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 50 MHz

Max Propagation Delay @ V, Max CL:: 38ns @ 4.5V, 150pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 6mA, 6mA

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 4 µA

Input Capacitance:: 5 pF

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

M74HCT374M1R FAQ

1.How can I place an order for M74HCT374M1R through Aetrix?

Please submit a Request for Quotation (RFQ) for M74HCT374M1R 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 M74HCT374M1R reliable?

The price and inventory of M74HCT374M1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HCT374M1R is usually 5 days.

3.What payment methods are accepted for M74HCT374M1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HCT374M1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M74HCT374M1R?

M74HCT374M1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M74HCT374M1R 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 M74HCT374M1R?

For technical support, including M74HCT374M1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HCT374M1R requirements.

6.How does Aetrix verify that M74HCT374M1R is sourced from the original manufacturer or authorized distributors?

All M74HCT374M1R 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 M74HCT374M1R meets industry standards.

7.What is the process for return or replacement of M74HCT374M1R?

All M74HCT374M1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HCT374M1R, 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 M74HCT374M1R part is unused and in its original packaging.

Return procedure for M74HCT374M1R:

1.Submit a request within 90 days.

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

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