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

Texas Instruments SN74LVTH125PWE4

Name: SN74LVTH125PWE4
Brand: Texas Instruments
SKU: SN74LVTH125PWE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH125PWE4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN74LVTH125PWE4.pdf

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

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Product details

Overview

SN74LVTH125PWE4 from Texas Instruments is a quad 3-state noninverting buffer designed for mixed-voltage 3.3-V V_CC systems interfacing with 5-V TTL logic. It supports bus-hold inputs, I_off protection, hot insertion, and operates down to 2.7 V. Used in backplane data routing, FPGA I/O expansion, and legacy system voltage translation.

For engineers reviewing the SN74LVTH125PWE4 datasheet, SN74LVTH125PWE4 pinout, SN74LVTH125PWE4 application, or SN74LVTH125PWE4 equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V tolerant inputs, bus-hold circuitry eliminating external resistors, and guaranteed 3-state behavior during power-up/down.

Technical Context

The SN74LVTH125PWE4 implements four independent noninverting buffers, each with dedicated 3-state output-enable (OE) control. Its bus-hold circuitry maintains valid logic states on undriven inputs without external pullup/pulldown resistors. The I_off feature disables outputs when V_CC = 0, preventing backflow current during hot insertion.

Power-up 3-state operation ensures outputs remain high-impedance while V_CC ramps from 0 to 1.5 V, and OE must be pulled to V_CC above that threshold to guarantee disable. Output ground bounce (V_OLP) is specified at <0.8 V under 3.3-V operation, supporting noise-sensitive digital interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - Enables stable operation from unregulated batteries or low-noise LDOs in portable and industrial systems.
Input Voltage Tolerance	Up to 5.5 V - Allows direct connection to 5-V TTL buses without level-shifting components.
I_OL / I_OH	64 mA / −32 mA at V_CC = 3 V - Drives heavy capacitive loads (e.g., long traces, multiple inputs) with fast edge rates.
t_PLH/t_PHL	Typ. 2.0 ns at V_CC = 3.3 V, CL = 50 pF - Supports >200 MHz data rates in point-to-point or lightly loaded bus applications.
Bus-Hold Current	±500 µA at V_CC = 3.6 V - Actively sustains input logic state with sufficient margin against noise or leakage.
ESD Protection	2000-V HBM, 200-V MM - Meets industrial-grade robustness requirements without external TVS diodes.
Thermal Resistance θ_JA	113°C/W (PW package) - Defines maximum power dissipation (≤7 mA ICC typical) before thermal derating in standard PCB layouts.

Pinout & Package

TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	Output Enable (1OE, 2OE, 3OE, 4OE)	Active-low control: high = high-Z output; enables hot-swap safe isolation of individual buffers.
2, 5, 11, 14	Data Input (1A, 2A, 3A, 4A)	5-V tolerant inputs with integrated bus-hold - eliminates need for external biasing in floating-bus scenarios.
3, 6, 12, 9	Buffer Output (1Y, 2Y, 3Y, 4Y)	Noninverting 3-state outputs capable of sinking 64 mA or sourcing 32 mA at 3.3 V.
7	GND	Ground reference for all I/O and internal circuitry; requires low-inductance connection to minimize ground bounce.
14	V_CC	3.3-V supply input; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable switching performance.

Key Features

Feature	Design Value
Mixed-mode signal interface	3.3-V V_CC operation with 5-V tolerant inputs enables seamless bridging between modern low-voltage logic and legacy 5-V systems.
Bus-hold circuitry	Eliminates external pullup/pulldown resistors on data inputs, reducing BOM count and board space in high-pin-count designs.
I_off and power-up 3-state	Prevents damaging current flow during hot insertion and guarantees high-impedance outputs during power sequencing.
Latch-up immunity	Exceeds 500 mA per JESD17 - ensures robust operation in noisy industrial environments with transient coupling.
Low output ground bounce	V_OLP < 0.8 V at 3.3 V/25°C - maintains signal integrity in high-speed parallel bus applications with simultaneous switching outputs.

Applications

Industrial Backplane Interface	FPGA I/O Expansion
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to a legacy 5-V ISA or VME backplane with shared address/data lines. IC Role / Device Role / Timing Role: Level-translating buffer isolating FPGA outputs while accepting 5-V inputs; provides clean 3-state control per line during bus arbitration. Use Value: Eliminates discrete level shifters and pull resistors, reducing layout complexity and enabling direct connection to 5-V peripherals without voltage conversion circuitry.	Use Scenario: Expanding the number of available 3.3-V CMOS outputs from an FPGA to drive multiple peripheral ICs with fanout >10. IC Role / Device Role / Timing Role: Fanout buffer with independent OE controls; used to gate clock or control signals to downstream devices like ADCs or DACs. Use Value: Delivers sub-3 ns propagation delay and 64-mA drive strength, ensuring timing-critical signals meet setup/hold margins across multi-load configurations.
Hot-Swappable Module Control	Automotive Diagnostic Bus Isolation
Use Scenario: Enabling safe insertion/removal of daughter cards in telecom line cards powered by a common 3.3-V backplane. IC Role / Device Role / Timing Role: Hot-insertion–qualified buffer providing I_off-protected data paths and power-up 3-state behavior during module power sequencing. Use Value: Prevents bus contention and backdrive damage during partial power-up, meeting GR-63-CORE reliability requirements for carrier-grade equipment.	Use Scenario: Isolating a microcontroller's UART or CAN controller I/O from an automotive diagnostic connector exposed to load-dump transients. IC Role / Device Role / Timing Role: Signal buffer with 5.5-V input tolerance and 2000-V HBM ESD rating, placed between MCU and connector to absorb ESD events and clamp overvoltage. Use Value: Withstands ISO 10605 ESD pulses and suppresses ground bounce-induced glitches during engine cranking, improving diagnostic port robustness.

Industrial Backplane Interface

FPGA I/O Expansion

Use Scenario: Interfacing a 3.3-V FPGA I/O bank to a legacy 5-V ISA or VME backplane with shared address/data lines.

IC Role / Device Role / Timing Role: Level-translating buffer isolating FPGA outputs while accepting 5-V inputs; provides clean 3-state control per line during bus arbitration.

Use Value: Eliminates discrete level shifters and pull resistors, reducing layout complexity and enabling direct connection to 5-V peripherals without voltage conversion circuitry.

Use Scenario: Expanding the number of available 3.3-V CMOS outputs from an FPGA to drive multiple peripheral ICs with fanout >10.

IC Role / Device Role / Timing Role: Fanout buffer with independent OE controls; used to gate clock or control signals to downstream devices like ADCs or DACs.

Use Value: Delivers sub-3 ns propagation delay and 64-mA drive strength, ensuring timing-critical signals meet setup/hold margins across multi-load configurations.

Hot-Swappable Module Control

Automotive Diagnostic Bus Isolation

Use Scenario: Enabling safe insertion/removal of daughter cards in telecom line cards powered by a common 3.3-V backplane.

IC Role / Device Role / Timing Role: Hot-insertion–qualified buffer providing I_off-protected data paths and power-up 3-state behavior during module power sequencing.

Use Value: Prevents bus contention and backdrive damage during partial power-up, meeting GR-63-CORE reliability requirements for carrier-grade equipment.

Use Scenario: Isolating a microcontroller's UART or CAN controller I/O from an automotive diagnostic connector exposed to load-dump transients.

IC Role / Device Role / Timing Role: Signal buffer with 5.5-V input tolerance and 2000-V HBM ESD rating, placed between MCU and connector to absorb ESD events and clamp overvoltage.

Use Value: Withstands ISO 10605 ESD pulses and suppresses ground bounce-induced glitches during engine cranking, improving diagnostic port robustness.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC125APWRE4	Lower drive (24 mA sink), no bus-hold, 1.65–3.6 V V_CC, no 5-V input tolerance	Suitable only for pure 3.3-V or dual-supply systems; requires external pull resistors if inputs float	Select when cost sensitivity outweighs 5-V interface needs and bus-hold is unnecessary.
SN74AHCT125PW	5-V V_CC only, TTL-compatible inputs, higher ICC (20 mA), no I_off or bus-hold	Requires 5-V rail; incompatible with 3.3-V-only systems; lacks hot-swap support	Choose only for legacy 5-V designs where mixed-voltage operation is not required.

Compared with SN74LVC125APWRE4 and SN74AHCT125PW, the SN74LVTH125PWE4 uniquely combines 5-V input tolerance, bus-hold, I_off, and 3.3-V operation-making it the sole option for robust hot-pluggable 3.3-V/5-V mixed-signal interconnects.

Availability

SN74LVTH125PWE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, and hot-swappable module control requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for SN74LVTH125PWE4 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 for industrial, automotive, and communications markets.

The SN74LVTH logic family delivers advanced 3.3-V CMOS performance with TTL-compatible input thresholds and 5-V tolerance-designed specifically for voltage translation and bus interface in mixed-signal systems.

FAQ

What is the minimum V_CC required for reliable operation of the SN74LVTH125PWE4?

The SN74LVTH125PWE4 is fully specified from 2.7 V to 3.6 V. Below 2.7 V, parameters such as VOL, VOH, and t_PD are not guaranteed. Operation down to 2.7 V supports battery-powered systems with nominal 3.3-V rails experiencing droop under load, but design margins should account for worst-case timing and noise immunity at this lower limit.

Does the SN74LVTH125PWE4 require external pullup resistors on its inputs?

No. The SN74LVTH125PWE4 integrates active bus-hold circuitry on all data inputs (1A–4A), which maintains a valid logic state when inputs are unused or undriven. TI explicitly advises against using external pullup or pulldown resistors with bus-hold enabled, as they may conflict with the internal hold current and degrade noise margin.

Can the SN74LVTH125PWE4 be used in hot-swap applications?

Yes. The SN74LVTH125PWE4 is fully specified for hot-insertion use via two features: I_off circuitry disables outputs when V_CC = 0, preventing backflow current, and power-up 3-state ensures outputs remain high-impedance during V_CC ramp-up from 0 to 1.5 V. These capabilities are validated per JEDEC standards and documented in the SCBS703I datasheet.

What is the thermal resistance (θ_JA) of the SN74LVTH125PWE4 in its TSSOP-14 (PW) package?

The SN74LVTH125PWE4 in the PW package has a junction-to-ambient thermal resistance (θ_JA) of 113°C/W, measured per JESD 51-7 on a standard 2-layer JEDEC test board. This value assumes no thermal vias or copper pour; adding thermal relief or stitching vias beneath the GND pad can reduce effective θ_JA by 15–25% in production layouts.

How does the SN74LVTH125PWE4 handle input voltages exceeding V_CC?

The SN74LVTH125PWE4 supports input voltages up to 5.5 V regardless of V_CC level (2.7–3.6 V), verified by absolute maximum ratings and electrical characteristics tables. This 5-V tolerance is achieved via internal clamping structures and allows direct connection to 5-V TTL buses without external level-shifting components-critical for mixed-voltage system interoperability.

SN74LVTH125PWE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVTH

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

Packaging:: Bulk

Product Status:: Discontinued at Digi-Key

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-TSSOP

SN74LVTH125PWE4 FAQ

1.How can I place an order for SN74LVTH125PWE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH125PWE4 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 SN74LVTH125PWE4 reliable?

The price and inventory of SN74LVTH125PWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH125PWE4 is usually 5 days.

3.What payment methods are accepted for SN74LVTH125PWE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH125PWE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTH125PWE4?

SN74LVTH125PWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH125PWE4 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 SN74LVTH125PWE4?

For technical support, including SN74LVTH125PWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH125PWE4 requirements.

6.How does Aetrix verify that SN74LVTH125PWE4 is sourced from the original manufacturer or authorized distributors?

All SN74LVTH125PWE4 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 SN74LVTH125PWE4 meets industry standards.

7.What is the process for return or replacement of SN74LVTH125PWE4?

All SN74LVTH125PWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH125PWE4, 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 SN74LVTH125PWE4 part is unused and in its original packaging.

Return procedure for SN74LVTH125PWE4:

1.Submit a request within 90 days.

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

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