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

Texas Instruments SN74LVTH374DW

Name: SN74LVTH374DW
Brand: Texas Instruments
SKU: SN74LVTH374DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH374DW

Manufacturer:: Texas Instruments

Category:: Flip Flops

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

Datasheet:: SN74LVTH374DW.pdf

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

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Product details

Overview

SN74LVTH374DW from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with 3-state outputs, designed for mixed-mode 3.3-V V_CC operation while interfacing to 5-V TTL systems. It features bus-hold on data inputs, I_off and power-up 3-state for hot insertion, and supports operation down to 2.7 V. It is used in address/data latching and bus interface circuits in industrial control and communications backplanes.

For engineers reviewing the SN74LVTH374DW datasheet, SN74LVTH374DW pinout, SN74LVTH374DW application, or SN74LVTH374DW equivalent, key selection criteria include its 20-pin SOIC (DW) package, 150-MHz maximum clock frequency, ±64-mA output drive, bus-hold input retention, and support for unregulated battery supply down to 2.7 V.

Technical Context

This device implements eight independent edge-triggered D-type latches with a common clock (CLK) and buffered output-enable (OE) control. Each flip-flop captures the logic state at its D input on the rising edge of CLK and presents it at Q, while OE independently places all eight outputs in high-impedance without affecting internal latch states.

The architecture integrates bus-hold circuitry on all data inputs to maintain valid logic levels when undriven, eliminating external pull resistors. I_off protection disables outputs during power-down to prevent current backflow, and power-up 3-state ensures outputs remain high-Z until V_CC exceeds 1.5 V - critical for hot-swap and mixed-voltage board designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - enables stable operation from single-cell Li-ion or regulated 3.3-V rails without external regulation.
Max Clock Frequency	150 MHz - supports high-speed data capture in memory interfaces and synchronous bus applications.
Output Drive (I_OL/I_OH)	64 mA sink / 32 mA source - drives heavy capacitive loads and multiple TTL inputs directly without buffers.
Input Voltage Tolerance	Up to 5.5 V on all inputs - allows direct connection to 5-V logic without level shifters.
Propagation Delay (t_PLH/t_PHL)	Typ. 2.9 ns at V_CC = 3.3 V - ensures tight timing margins in high-frequency synchronous systems.
Bus-Hold Current	±750 µA max - actively retains input state during floating conditions, removing need for external biasing.
Power-Up 3-State Threshold	Active below 1.5 V V_CC - guarantees safe high-Z state during brown-out and hot-plug sequences.

Pinout & Package

SN74LVTH374DW is housed in a 20-pin SOIC (DW) package per JEDEC MS-013, 7.5 mm wide, 12.83 mm long, 2.65 mm max height, with 1.27 mm pitch. Pin 1 is marked by a beveled corner or index notch.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Data Inputs (1D–8D)	Asynchronous D inputs for each of eight flip-flops; feature integrated bus-hold for floating-input immunity.
9	Output Enable (OE)	Active-low control: when low, enables Q outputs; when high or floating (with bus-hold), forces all outputs to high-Z.
10	GND	Ground reference for all logic and output stages; must be low-impedance for noise immunity and output drive integrity.
11	V_CC	3.3-V supply input; supports down to 2.7 V; powers internal logic, bus-hold, and output drivers.
12, 13, 14, 15, 16, 17, 18, 19	Outputs (1Q–8Q)	Registered outputs with 3-state capability; each delivers full TTL-compatible swing and ±64-mA drive.
20	CLK	Global positive-edge clock input; synchronizes all eight D-to-Q transfers; tolerant of slow-rising edges per ∆t/∆v spec.

Key Features

Feature	Design Value
Mixed-mode voltage interface	3.3-V V_CC with 5-V-tolerant inputs enables seamless integration between 3.3-V logic and legacy 5-V subsystems.
Integrated bus-hold	Eliminates external pullup/pulldown resistors on all eight D inputs, reducing BOM count and PCB area.
I_off and power-up 3-state	Prevents backdrive current during power-down and ensures outputs stay high-Z until V_CC stabilizes - essential for hot-swap compliance.
Low ground bounce (V_OLP)	<0.8 V typical at V_CC = 3.3 V - minimizes switching noise coupling into shared ground planes.
Latch-up immunity	>500 mA per JESD 17 - ensures robustness against transient overcurrent events in industrial environments.

Applications

Industrial PLC Backplane Interface	Memory Address Latching
Use Scenario: Isolating and latching address/data signals between 5-V microcontroller peripherals and 3.3-V FPGA-based control logic in programmable logic controllers. IC Role / Device Role / Timing Role: Octal D flip-flop providing synchronized, level-shifted data staging with bus-hold retention during bus arbitration gaps. Use Value: Enables reliable signal handoff across voltage domains without external level translators or pull resistors, reducing interconnect latency and component count.	Use Scenario: Capturing and holding memory address lines during burst read/write cycles in embedded systems with asynchronous SRAM or Flash. IC Role / Device Role / Timing Role: Edge-triggered latch that freezes address values on CLK rise, decoupling processor timing from memory access delays. Use Value: Provides deterministic setup/hold timing (1.5 ns t_su, 0.5 ns t_h) and 150-MHz operation to support high-bandwidth memory interfaces without timing closure risk.
Hot-Swappable I/O Module	Communications Bus Transceiver Interface
Use Scenario: Managing data flow in modular I/O cards that plug into powered-backplane systems requiring zero-downtime field replacement. IC Role / Device Role / Timing Role: Output-enabled buffer/latch ensuring clean bus isolation during card insertion/removal via I_off and power-up 3-state behavior. Use Value: Prevents bus contention and backdrive damage during hot insertion by guaranteeing high-Z outputs until V_CC reaches 1.5 V and OE is asserted.	Use Scenario: Driving bidirectional data buses in UART, SPI, or parallel peripheral interfaces where multiple devices share a common data path. IC Role / Device Role / Timing Role: 3-state octal register acting as direction-controlled data latch, enabling clean bus turnarounds with minimal dead time. Use Value: Delivers ±64-mA drive strength and sub-3-ns propagation delay to maintain signal integrity across 15-cm traces loaded with multiple receivers.

Industrial PLC Backplane Interface

Memory Address Latching

Use Scenario: Isolating and latching address/data signals between 5-V microcontroller peripherals and 3.3-V FPGA-based control logic in programmable logic controllers.

IC Role / Device Role / Timing Role: Octal D flip-flop providing synchronized, level-shifted data staging with bus-hold retention during bus arbitration gaps.

Use Value: Enables reliable signal handoff across voltage domains without external level translators or pull resistors, reducing interconnect latency and component count.

Use Scenario: Capturing and holding memory address lines during burst read/write cycles in embedded systems with asynchronous SRAM or Flash.

IC Role / Device Role / Timing Role: Edge-triggered latch that freezes address values on CLK rise, decoupling processor timing from memory access delays.

Use Value: Provides deterministic setup/hold timing (1.5 ns t_su, 0.5 ns t_h) and 150-MHz operation to support high-bandwidth memory interfaces without timing closure risk.

Hot-Swappable I/O Module

Communications Bus Transceiver Interface

Use Scenario: Managing data flow in modular I/O cards that plug into powered-backplane systems requiring zero-downtime field replacement.

IC Role / Device Role / Timing Role: Output-enabled buffer/latch ensuring clean bus isolation during card insertion/removal via I_off and power-up 3-state behavior.

Use Value: Prevents bus contention and backdrive damage during hot insertion by guaranteeing high-Z outputs until V_CC reaches 1.5 V and OE is asserted.

Use Scenario: Driving bidirectional data buses in UART, SPI, or parallel peripheral interfaces where multiple devices share a common data path.

IC Role / Device Role / Timing Role: 3-state octal register acting as direction-controlled data latch, enabling clean bus turnarounds with minimal dead time.

Use Value: Delivers ±64-mA drive strength and sub-3-ns propagation delay to maintain signal integrity across 15-cm traces loaded with multiple receivers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC374APW	Lower drive (24 mA sink), no bus-hold, 1.65–3.6 V V_CC; TSSOP-20 only.	Suitable for low-power, space-constrained designs where external pull resistors are acceptable and 5-V input tolerance is not required.	Select when cost, footprint, or ultra-low static current (<1 µA ICC) outweigh need for 5-V tolerance and bus-hold.
SN74AHCT374N	5-V-only operation (4.5–5.5 V), higher propagation delay (~7 ns), DIP-20 or SOIC-20 package.	Used in legacy 5-V systems requiring TTL-compatible thresholds but no mixed-voltage support.	Choose only for retrofitting existing 5-V boards; incompatible with 3.3-V V_CC or 5-V input interfacing.

Compared with SN74LVC374APW and SN74AHCT374N, the SN74LVTH374DW uniquely combines 5-V-tolerant inputs, integrated bus-hold, and hot-swap safety - making it the sole option for new 3.3-V designs interfacing to 5-V buses without external components or layout changes.

Availability

SN74LVTH374DW is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory address latching, hot-swappable I/O modules, and communications bus transceiver interfaces requiring stable component supply and long-term manufacturability.

Supply support for SN74LVTH374DW 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 expertise in high-reliability interface and timing ICs.

The SN74LVTH374DW belongs to TI's LVTH logic family, engineered for robust mixed-voltage system interfacing - specifically targeting industrial, telecom, and computing applications where 3.3-V core logic must reliably communicate with legacy 5-V peripherals.

FAQ

What is the recommended operating voltage range for the SN74LVTH374DW?

The SN74LVTH374DW is specified for continuous operation from 2.7 V to 3.6 V on V_CC. Operation below 2.7 V is not guaranteed, and exceeding 3.6 V risks permanent damage. The device supports unregulated battery input down to 2.7 V, making it suitable for portable and industrial power supplies with moderate ripple.

Does the SN74LVTH374DW require external pullup or pulldown resistors on its data inputs?

No. The SN74LVTH374DW includes active bus-hold circuitry on all eight D inputs, which maintains a valid logic state when inputs are floating or undriven. Using external pull resistors with bus-hold enabled is not recommended and may cause excessive current draw or logic instability.

Can the SN74LVTH374DW safely interface with 5-V logic signals?

Yes. All inputs of the SN74LVTH374DW tolerate up to 5.5 V regardless of V_CC level, enabling direct connection to 5-V TTL outputs without level-shifting circuitry. This mixed-mode capability is a defining feature of the LVTH family and is fully characterized in the datasheet.

What happens to the outputs of the SN74LVTH374DW during power-up or power-down?

During power-up or power-down, the SN74LVTH374DW employs power-up 3-state circuitry that forces all outputs into high-impedance when V_CC is below 1.5 V. Additionally, I_off protection disables outputs entirely when V_CC = 0 V, preventing damaging back-current flow from driven bus lines.

Is the SN74LVTH374DW pin-compatible with other members of the '374 family?

The SN74LVTH374DW shares identical pinout and function with SN74LVTH374DWR, SN74LVTH374NSR, and SN74LVTH374PWR - all are 20-pin octal D flip-flops with OE control. However, it is not pin-compatible with non-LVTH variants like SN74LVC374 or SN74AHCT374 due to differing input threshold and drive characteristics, despite identical pin counts and arrangement.

SN74LVTH374DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVTH

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

Packaging:: Bulk

Product Status:: Active

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 150 MHz

Max Propagation Delay @ V, Max CL:: 4.5ns @ 3.3V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 32mA, 64mA

Voltage - Supply:: 2.7V ~ 3.6V

Current - Quiescent (Iq):: 190 µA

Input Capacitance:: 3 pF

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

SN74LVTH374DW FAQ

1.How can I place an order for SN74LVTH374DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH374DW 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 SN74LVTH374DW reliable?

The price and inventory of SN74LVTH374DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH374DW is usually 5 days.

3.What payment methods are accepted for SN74LVTH374DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH374DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTH374DW?

SN74LVTH374DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH374DW 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 SN74LVTH374DW?

For technical support, including SN74LVTH374DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH374DW requirements.

6.How does Aetrix verify that SN74LVTH374DW is sourced from the original manufacturer or authorized distributors?

All SN74LVTH374DW 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 SN74LVTH374DW meets industry standards.

7.What is the process for return or replacement of SN74LVTH374DW?

All SN74LVTH374DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH374DW, 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 SN74LVTH374DW part is unused and in its original packaging.

Return procedure for SN74LVTH374DW:

1.Submit a request within 90 days.

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

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