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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74LVT125DBR

Name: SN74LVT125DBR
Brand: Texas Instruments
SKU: SN74LVT125DBR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVT125DBR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-SSOP (0.209", 5.30mm Width)

Datasheet:: SN74LVT125DBR.pdf

Description:: IC BUF NON-INVERT 3.6V 14SSOP

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Product details

Overview

SN74LVT125DBR from Texas Instruments is a quad 3-state noninverting buffer designed for mixed-mode 3.3-V V_CC operation with 5-V tolerant inputs and outputs, supporting bus-hold logic, I_off partial-power-down protection, and 2.7–3.6-V supply range - used in voltage-level translation between 3.3-V logic domains and legacy 5-V systems.

For engineers reviewing the SN74LVT125DBR datasheet, SN74LVT125DBR pinout, SN74LVT125DBR application, or SN74LVT125DBR equivalent, key selection criteria include its 14-pin SSOP (DB) package, 2.7–3.6-V V_CC operation, bus-hold input retention, I_off current limiting, and guaranteed 3.9-ns max t_PHL/t_PLH at 3.3 V.

Technical Context

The SN74LVT125DBR implements four independent noninverting buffers, each with active-low output-enable control (OE), enabling high-impedance state on individual channels. Its bus-hold circuitry actively maintains valid logic levels on undriven inputs without external resistors.

It features I_off protection that disables outputs and limits reverse current when V_CC = 0 V, and supports mixed-voltage signaling: 5-V-tolerant inputs/outputs while operating from a 3.3-V supply - critical for interfacing LVT logic with TTL or older 5-V buses.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - enables stable operation under unregulated battery supply down to 2.7 V.
Input Voltage Tolerance	Up to 5.5 V - allows direct connection to 5-V TTL outputs without level-shifting circuitry.
t_PLH/t_PHL	Max 3.9 ns at V_CC = 3.3 V - ensures fast signal propagation for high-speed bus buffering.
I_off	±100 µA at V_CC = 0 - prevents damaging backflow current during partial power-down sequences.
Bus-Hold Current	±75 µA at V_CC = 3 V - actively retains input state without pullup/pulldown resistors, reducing BOM count.
V_OL (I_OL = 32 mA)	0.5 V max at V_CC = 3 V - guarantees strong low-level drive into heavy capacitive loads.
θ_JA	96 °C/W - thermal resistance of SSOP (DB) package informs derating requirements in compact layouts.

Pinout & Package

SN74LVT125DBR uses a 14-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.4-mm body width, and 2.0-mm max height - optimized for space-constrained PCBs requiring higher pin density than SOIC.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	Output Enable (OE)	Active-low control per channel; high = high-Z output, low = enabled buffer.
2, 5, 11, 14	Data Input (A)	Noninverting input for corresponding buffer; accepts 5-V-tolerant signals.
3, 6, 12, 9	Buffer Output (Y)	3-state noninverting output; drives 3.3-V logic with 5-V tolerance.
7	GND	Ground reference for all internal circuitry and I/O structures.
14	V_CC	3.3-V supply input; powers internal logic and output drivers.

Key Features

Feature	Design Value
Mixed-mode signal interface	5-V input/output compatibility with 3.3-V V_CC eliminates external level shifters in hybrid voltage systems.
Bus-hold circuitry	Eliminates need for external pullup resistors on unused or floating inputs - reduces component count and layout complexity.
I_off protection	Prevents current backflow during partial power-down, enabling safe hot-insertion and multi-rail sequencing.
Low ground bounce (V_OLP)	<0.8 V at V_CC = 3.3 V - minimizes noise coupling into shared ground planes in dense digital systems.
Latch-up immunity	>500 mA per JEDEC JESD-17 - ensures robustness against transient overvoltage events in industrial environments.

Applications

Industrial PLC Backplane Interface	Automotive Body Control Module (BCM) Signal Conditioning
Use Scenario: Interfacing 3.3-V microcontroller GPIOs to legacy 5-V sensor bus lines in programmable logic controller racks. IC Role / Device Role / Timing Role: Level-translating buffer providing bidirectional 5-V-tolerant input capture and 3.3-V-driven output assertion on shared data lines. Use Value: Enables direct MCU integration without discrete level shifters, reducing latency and board area while maintaining noise margin.	Use Scenario: Isolating and conditioning door lock actuator control signals between 3.3-V domain controller and 5-V relay driver stage. IC Role / Device Role / Timing Role: Noninverting 3-state buffer with bus-hold, ensuring defined logic states during sleep mode transitions. Use Value: Prevents undefined outputs during MCU reset or low-power states, eliminating spurious actuator activation.
Telecom Line Card Voltage Translation	Test Equipment Digital Pattern Generator Interface
Use Scenario: Driving 5-V-compatible FPGA configuration pins from a 3.3-V CPLD on high-density telecom line cards. IC Role / Device Role / Timing Role: Quad buffer with independent OE controls synchronizing multiple configuration signals across voltage domains. Use Value: Guarantees setup/hold timing compliance with FPGA config specs while simplifying power domain partitioning.	Use Scenario: Buffering parallel digital stimulus patterns from 3.3-V pattern generator ASIC to 5-V DUT interface connectors. IC Role / Device Role / Timing Role: High-speed 3-state driver with sub-4-ns propagation delay, enabling precise edge alignment across 16-bit buses. Use Value: Maintains signal integrity and timing accuracy at >100-MHz pattern rates without added jitter or skew.

Industrial PLC Backplane Interface

Automotive Body Control Module (BCM) Signal Conditioning

Use Scenario: Interfacing 3.3-V microcontroller GPIOs to legacy 5-V sensor bus lines in programmable logic controller racks.

IC Role / Device Role / Timing Role: Level-translating buffer providing bidirectional 5-V-tolerant input capture and 3.3-V-driven output assertion on shared data lines.

Use Value: Enables direct MCU integration without discrete level shifters, reducing latency and board area while maintaining noise margin.

Use Scenario: Isolating and conditioning door lock actuator control signals between 3.3-V domain controller and 5-V relay driver stage.

IC Role / Device Role / Timing Role: Noninverting 3-state buffer with bus-hold, ensuring defined logic states during sleep mode transitions.

Use Value: Prevents undefined outputs during MCU reset or low-power states, eliminating spurious actuator activation.

Telecom Line Card Voltage Translation

Test Equipment Digital Pattern Generator Interface

Use Scenario: Driving 5-V-compatible FPGA configuration pins from a 3.3-V CPLD on high-density telecom line cards.

IC Role / Device Role / Timing Role: Quad buffer with independent OE controls synchronizing multiple configuration signals across voltage domains.

Use Value: Guarantees setup/hold timing compliance with FPGA config specs while simplifying power domain partitioning.

Use Scenario: Buffering parallel digital stimulus patterns from 3.3-V pattern generator ASIC to 5-V DUT interface connectors.

IC Role / Device Role / Timing Role: High-speed 3-state driver with sub-4-ns propagation delay, enabling precise edge alignment across 16-bit buses.

Use Value: Maintains signal integrity and timing accuracy at >100-MHz pattern rates without added jitter or skew.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC125APWR	Lower V_CC range (1.65–3.6 V); no 5-V input tolerance - requires external clamping for 5-V signals.	Suitable only in pure 3.3-V or dual-supply 1.8/3.3-V systems; not drop-in for 5-V-tolerant designs.	Select when cost or lower static current (<0.1 µA I_CC) outweighs need for 5-V interface capability.
SN74LVTH125PW	Higher drive strength (I_OL = 64 mA vs. 32 mA); same 5-V tolerance and bus-hold; TSSOP-14 package.	Better suited for driving heavier capacitive loads or longer traces, but shares identical pinout and logic behavior.	Choose when system-level load exceeds 32 mA per output or when enhanced noise immunity is required.

Compared with SN74LVT125DBR, SN74LVC125APWR lacks 5-V tolerance and requires redesign for legacy interfaces, while SN74LVTH125PW offers higher drive at identical pin compatibility - making it a functional upgrade path where output loading demands increase.

Availability

SN74LVT125DBR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant SSOP packaging.

Supply support for SN74LVT125DBR 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 ICs and industrial-grade timing products.

The SN74LVT125DBR belongs to TI's LVT (Low-Voltage BiCMOS Technology) logic family, engineered for seamless interoperability between 3.3-V and 5-V systems in demanding industrial and communications applications.

FAQ

What is the maximum operating temperature range for the SN74LVT125DBR?

The SN74LVT125DBR is rated for operation from −40°C to +85°C ambient temperature, as confirmed in the recommended operating conditions table of the official datasheet (SCBS133F). This range applies to the SSOP (DB) package variant and supports deployment in industrial and automotive under-hood environments where thermal stability is critical. The device maintains full electrical specifications across this range.

Does the SN74LVT125DBR require external pullup resistors on its inputs?

No - the SN74LVT125DBR integrates active bus-hold circuitry on all data inputs (pins 2, 5, 11, 14), which maintains a valid logic state on undriven or floating inputs without external pullup or pulldown resistors. Using external resistors with bus-hold enabled is explicitly discouraged in the datasheet, as it may cause contention and increased power consumption.

Can the SN74LVT125DBR be used with a 2.5-V supply voltage?

No - the SN74LVT125DBR has a minimum recommended V_CC of 2.7 V per the datasheet's "Recommended Operating Conditions" table. Operation below 2.7 V is not guaranteed: parameters like VOL, VOH, and switching speed degrade outside specification, and bus-hold functionality may become unreliable. For 2.5-V systems, consider the SN74LVC125A series instead.

What is the thermal resistance (θ_JA) of the SN74LVT125DBR package?

The SN74LVT125DBR in the SSOP (DB) package has a junction-to-ambient thermal resistance (θ_JA) of 96°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC test board conditions and informs thermal design margins - for example, at 7 mA ICC and 3.3 V, power dissipation is ~23 mW, resulting in ~2.2°C junction rise above ambient.

Is the SN74LVT125DBR pin-compatible with other packages in the same family?

Yes - the SN74LVT125DBR shares identical pinout and logic function with other variants including SN74LVT125D (SOIC), SN74LVT125NSR (SOP), and SN74LVT125PWR (TSSOP), all featuring 14-pin configurations with matching signal assignments (e.g., pin 1 = 1OE, pin 2 = 1A, etc.). Mechanical footprint differs, but schematic symbol and netlist remain interchangeable across packages.

SN74LVT125DBR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVT

Package/Case:: 14-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 4

Number of Bits per Element:: 1

Input Type:: -

Output Type:: 3-State

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

Voltage - Supply:: 2.7V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SSOP

SN74LVT125DBR FAQ

1.How can I place an order for SN74LVT125DBR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVT125DBR 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 SN74LVT125DBR reliable?

The price and inventory of SN74LVT125DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT125DBR is usually 5 days.

3.What payment methods are accepted for SN74LVT125DBR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT125DBR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVT125DBR?

SN74LVT125DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVT125DBR 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 SN74LVT125DBR?

For technical support, including SN74LVT125DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT125DBR requirements.

6.How does Aetrix verify that SN74LVT125DBR is sourced from the original manufacturer or authorized distributors?

All SN74LVT125DBR 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 SN74LVT125DBR meets industry standards.

7.What is the process for return or replacement of SN74LVT125DBR?

All SN74LVT125DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT125DBR, 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 SN74LVT125DBR part is unused and in its original packaging.

Return procedure for SN74LVT125DBR:

1.Submit a request within 90 days.

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

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