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

Texas Instruments SN74LVTH125RGYR

Name: SN74LVTH125RGYR
Brand: Texas Instruments
SKU: SN74LVTH125RGYR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH125RGYR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-VFQFN Exposed Pad

Datasheet:: SN74LVTH125RGYR.pdf

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

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Product details

Overview

SN74LVTH125RGYR from Texas Instruments is a quad 3-state noninverting buffer designed for 3.3-V V_CC operation with 5-V tolerant inputs and outputs. It supports mixed-mode signal interfacing between 3.3-V logic and legacy 5-V systems, features bus-hold on all data inputs, I_off for hot insertion, and operates down to 2.7 V. It is used in backplane and motherboard bus interface applications requiring level translation and drive strength.

For engineers reviewing the SN74LVTH125RGYR datasheet, SN74LVTH125RGYR pinout, SN74LVTH125RGYR application, or SN74LVTH125RGYR equivalent, key selection criteria include its 3.3-V supply compatibility, 5-V input tolerance, bus-hold functionality eliminating external resistors, thermal performance (θ_JA = 47°C/W), and QFN-14 (RGY) package suitability for high-density PCB layouts.

Technical Context

The SN74LVTH125RGYR implements four independent noninverting buffers, each with an active-low output-enable (OE) control enabling high-impedance state. Its TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2 V) and 5-V tolerant input voltage range (−0.5 V to 7 V) allow direct connection to 5-V buses without level shifters.

Power-up 3-state and I_off circuitry ensure safe hot-insertion by disabling outputs when V_CC is below 1.5 V or powered off. Bus-hold circuitry maintains valid logic states on undriven inputs, drawing ±500 µA at V_CC = 3.6 V, eliminating need for external pullup/pulldown resistors.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V while maintaining full logic functionality
Input Voltage Tolerance	−0.5 V to 7 V - enables direct interfacing with 5-V TTL/CMOS buses without external level-shifting components
I_OL / I_OH	64 mA / −32 mA at V_CC = 3 V - provides sufficient drive strength for loaded backplane or board-level buses
t_PLH/t_PHL	1 ns to 4.5 ns at V_CC = 3.3 V - ensures fast propagation for high-speed digital control and data routing
θ_JA	47°C/W - superior thermal dissipation in the RGY VQFN package versus SOIC (86°C/W) or TSSOP (113°C/W)
Bus-Hold Current	±500 µA at V_CC = 3.6 V - actively sustains logic state on floating inputs, removing requirement for external biasing
I_off	±100 µA at V_CC = 0 - prevents damaging current backflow during hot-swap events or power sequencing mismatches

Pinout & Package

VQFN-14 (RGY) package: 3.5 mm × 3.5 mm body, 0.5 mm pitch, exposed thermal pad, 1 mm max height. Designed for high thermal efficiency (θ_JA = 47°C/W) and space-constrained layouts.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	Output Enable (1OE, 2OE, 3OE, 4OE)	Active-low controls for respective buffer outputs; high = high-Z, low = enabled noninverting pass-through
2, 5, 11, 14	Data Input (1A, 2A, 3A, 4A)	5-V tolerant buffered inputs with integrated bus-hold; no external resistors required
3, 6, 12, 9	Buffer Output (1Y, 2Y, 3Y, 4Y)	3.3-V CMOS outputs capable of driving 64 mA sink / 32 mA source into 5-V-tolerant loads
7	GND	Ground reference for logic and power; must be connected to system ground plane
8	V_CC	3.3-V supply input; decoupling capacitor (0.1 µF) required near pin for noise suppression

Key Features

Feature	Design Value
Mixed-mode signal operation	Enables direct interconnection between 3.3-V logic domains and 5-V legacy systems without level translators
Bus-hold on all data inputs	Eliminates need for external pullup/pulldown resistors, reducing BOM count and layout area
I_off and power-up 3-state	Prevents current backflow and driver conflicts during hot insertion or asymmetric power sequencing
Low ground bounce (V_OLP < 0.8 V)	Minimizes switching noise on shared ground paths in multi-buffer bus applications
Latch-up immunity > 500 mA	Meets JESD17 requirements for robust operation in noisy industrial environments

Applications

Industrial Backplane Interface	Embedded Control Bus Isolation
Use Scenario: Interfacing a 3.3-V microcontroller to a legacy 5-V parallel control bus in programmable logic controllers. IC Role / Device Role / Timing Role: Level-translating buffer providing bidirectional signal integrity and drive strength across voltage domains. Use Value: Eliminates discrete level shifters and reduces component count while supporting hot-swap maintenance of modular I/O cards.	Use Scenario: Isolating sensor data lines from a main processor bus in automotive body control modules. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control enabling time-multiplexed access to shared analog-to-digital converter resources. Use Value: Bus-hold prevents floating inputs during sleep mode, ensuring deterministic startup and reducing EMI susceptibility.
High-Density FPGA I/O Expansion	Hot-Swappable Server Management Interface
Use Scenario: Expanding FPGA GPIO count to drive multiple LED indicators and status signals on compact server management boards. IC Role / Device Role / Timing Role: Quad buffer providing fan-out capability and 5-V compatible signaling for panel-mounted peripherals. Use Value: VQFN-14 package enables dense placement adjacent to FPGA BGA packages; low θ_JA supports sustained operation in thermally constrained enclosures.	Use Scenario: Enabling hot-plug insertion of service processor daughterboards in enterprise rack servers. IC Role / Device Role / Timing Role: I_off-enabled buffer isolating management bus signals during power-up/power-down sequences. Use Value: Prevents backdrive damage to powered-down subsystems and eliminates need for complex power sequencing hardware.

Industrial Backplane Interface

Embedded Control Bus Isolation

Use Scenario: Interfacing a 3.3-V microcontroller to a legacy 5-V parallel control bus in programmable logic controllers.

IC Role / Device Role / Timing Role: Level-translating buffer providing bidirectional signal integrity and drive strength across voltage domains.

Use Value: Eliminates discrete level shifters and reduces component count while supporting hot-swap maintenance of modular I/O cards.

Use Scenario: Isolating sensor data lines from a main processor bus in automotive body control modules.

IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control enabling time-multiplexed access to shared analog-to-digital converter resources.

Use Value: Bus-hold prevents floating inputs during sleep mode, ensuring deterministic startup and reducing EMI susceptibility.

High-Density FPGA I/O Expansion

Hot-Swappable Server Management Interface

Use Scenario: Expanding FPGA GPIO count to drive multiple LED indicators and status signals on compact server management boards.

IC Role / Device Role / Timing Role: Quad buffer providing fan-out capability and 5-V compatible signaling for panel-mounted peripherals.

Use Value: VQFN-14 package enables dense placement adjacent to FPGA BGA packages; low θ_JA supports sustained operation in thermally constrained enclosures.

Use Scenario: Enabling hot-plug insertion of service processor daughterboards in enterprise rack servers.

IC Role / Device Role / Timing Role: I_off-enabled buffer isolating management bus signals during power-up/power-down sequences.

Use Value: Prevents backdrive damage to powered-down subsystems and eliminates need for complex power sequencing hardware.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad noninverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC125ARGYR	Lower drive strength (24 mA sink), no bus-hold, 5-V tolerant only up to 5.5 V (not 7 V), no I_off	Suitable for lower-current, cost-sensitive designs where hot-swap and floating-input handling are not required	Select when thermal budget and bus-hold are unnecessary and 5-V tolerance ≤5.5 V suffices
SN74AHCT125PW	TSSOP-14 package, 4.5–5.5 V V_CC, higher propagation delay (6.5 ns), no bus-hold or I_off	Designed for pure 5-V systems; lacks 3.3-V compatibility and hot-insertion support	Choose only for legacy 5-V-only designs where footprint compatibility with PW package is critical

Compared with SN74LVC125ARGYR and SN74AHCT125PW, the SN74LVTH125RGYR uniquely combines 3.3-V operation, 7-V input tolerance, bus-hold, I_off, and high thermal efficiency in a 3.5-mm QFN-making it the only option qualified for mixed-voltage hot-swap bus interfaces.

Availability

SN74LVTH125RGYR is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded control bus isolation, and high-density FPGA I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVTH125RGYR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74LVTH125RGYR belongs to TI's LVTH logic family, engineered specifically for robust 3.3-V bus interfacing in mixed-voltage systems requiring hot-swap capability, bus-hold stability, and wide input voltage tolerance.

FAQ

What is the maximum input voltage rating for SN74LVTH125RGYR?

The SN74LVTH125RGYR supports an input voltage range of −0.5 V to 7 V, verified per absolute maximum ratings. This allows direct connection to 5-V TTL buses without clamping diodes or external protection, and exceeds standard 5.5-V tolerance found in LVC-family devices. The 7-V rating applies across the full operating temperature range (−40°C to 85°C).

Does SN74LVTH125RGYR require external pullup resistors on its inputs?

No, SN74LVTH125RGYR does not require external pullup or pulldown resistors due to integrated bus-hold circuitry on all data inputs. This feature actively maintains a valid logic state on unused or undriven inputs, drawing ±500 µA at V_CC = 3.6 V. Using external resistors with bus-hold is explicitly discouraged in the datasheet.

What is the thermal performance of SN74LVTH125RGYR in its RGY package?

The SN74LVTH125RGYR in the VQFN-14 (RGY) package has a junction-to-ambient thermal resistance (θ_JA) of 47°C/W, measured per JESD 51-5. This is significantly lower than alternative packages like SOIC (86°C/W) or TSSOP (113°C/W), enabling higher sustained output current in thermally constrained layouts without derating.

Can SN74LVTH125RGYR be used in hot-swap applications?

Yes, SN74LVTH125RGYR is fully specified for hot-insertion applications using both I_off and power-up 3-state circuitry. When powered down (V_CC = 0), I_off limits current flow to ±100 µA. During power-up/down transitions (V_CC < 1.5 V), outputs remain in high-impedance state, preventing bus conflicts and backdrive damage.

What is the recommended power supply decoupling for SN74LVTH125RGYR?

A 0.1-µF ceramic capacitor placed as close as possible to the V_CC (pin 8) and GND (pin 7) terminals is required for stable operation of SN74LVTH125RGYR. The exposed thermal pad must be soldered to a solid ground plane to ensure optimal thermal performance and electrical noise suppression, per TI's SLUA271 design guidelines.

SN74LVTH125RGYR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVTH

Package/Case:: 14-VFQFN Exposed Pad

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-VQFN (3.5x3.5)

SN74LVTH125RGYR FAQ

1.How can I place an order for SN74LVTH125RGYR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH125RGYR 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 SN74LVTH125RGYR reliable?

The price and inventory of SN74LVTH125RGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH125RGYR is usually 5 days.

3.What payment methods are accepted for SN74LVTH125RGYR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH125RGYR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTH125RGYR?

SN74LVTH125RGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH125RGYR 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 SN74LVTH125RGYR?

For technical support, including SN74LVTH125RGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH125RGYR requirements.

6.How does Aetrix verify that SN74LVTH125RGYR is sourced from the original manufacturer or authorized distributors?

All SN74LVTH125RGYR 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 SN74LVTH125RGYR meets industry standards.

7.What is the process for return or replacement of SN74LVTH125RGYR?

All SN74LVTH125RGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH125RGYR, 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 SN74LVTH125RGYR part is unused and in its original packaging.

Return procedure for SN74LVTH125RGYR:

1.Submit a request within 90 days.

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

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