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

Texas Instruments SN74LVTH125DBRE4

Name: SN74LVTH125DBRE4
Brand: Texas Instruments
SKU: SN74LVTH125DBRE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH125DBRE4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN74LVTH125DBRE4.pdf

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

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Product details

Overview

SN74LVTH125DBRE4 from Texas Instruments is a quad 3-state noninverting buffer designed for mixed-voltage system interfacing, supporting 5-V TTL inputs/outputs with 3.3-V V_CC, operating down to 2.7 V, and featuring bus-hold on all data inputs. It enables hot insertion in backplane or modular systems via I_off and power-up 3-state logic.

For engineers reviewing the SN74LVTH125DBRE4 datasheet, SN74LVTH125DBRE4 pinout, SN74LVTH125DBRE4 application, or SN74LVTH125DBRE4 equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V signal tolerance, 14-pin SSOP (DB) package thermal performance (θ_JA = 96°C/W), bus-hold input stabilization, and guaranteed 4.2 ns t_PLH at 3.3 V.

Technical Context

The SN74LVTH125DBRE4 implements four independent noninverting buffers, each with dedicated 3-state output-enable (OE) control. Its bus-hold circuitry actively maintains valid logic states on undriven inputs without external resistors, eliminating floating node risks in high-impedance bus environments.

Hot-insertion support is achieved through dual protection mechanisms: I_off disables outputs when V_CC = 0 V to prevent current backflow, while power-up 3-state forces outputs into high-impedance during V_CC ramp-up (0–1.5 V), avoiding bus contention during power sequencing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports unregulated battery operation and ensures stable logic levels across industrial temperature range (−40°C to 85°C)
Input Voltage Tolerance	Up to 5.5 V - allows direct connection to legacy 5-V TTL buses without level-shifting components
t_PLH/t_PHL	4.2 ns / 4.1 ns max at V_CC = 3.3 V - enables reliable timing in 100-MHz bus applications with 50-pF load
I_OL/I_OH	64 mA / −32 mA - drives standard TTL loads and sustains signal integrity across PCB traces up to 10 cm
Bus-Hold Current	±75 µA at V_CC = 3 V - actively holds inputs at valid logic thresholds without external pull resistors, reducing BOM count
ESD Protection	2000-V HBM, 200-V MM - meets JEDEC JESD22-A114/A115 for robust handling in manufacturing and field service

Pinout & Package

SN74LVTH125DBRE4 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 per JEDEC MO-150. Thermal resistance θ_JA = 96°C/W enables operation at full drive strength in compact industrial enclosures.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	Output Enable (OE)	Active-low control per buffer; high state forces corresponding Y output into high-impedance
2, 5, 11, 14	Data Input (A)	Noninverting input with bus-hold; eliminates need for external pullup/pulldown resistors
3, 6, 12, 9	Buffer Output (Y)	3-state CMOS output capable of sourcing −32 mA or sinking 64 mA at 3.3 V
7	GND	Signal reference plane; must be low-inductance connection to minimize ground bounce (V_OLP < 0.8 V)
14	V_CC	3.3-V supply rail; decoupling capacitor (0.1 µF) required within 5 mm for noise suppression

Key Features

Feature	Design Value
Mixed-mode signal interface	Accepts 5-V TTL inputs while powered from 3.3-V V_CC, enabling seamless interoperation between legacy and low-voltage subsystems
Bus-hold circuitry	Internally latches unused or undriven inputs at valid logic levels, removing external biasing components and reducing layout complexity
Hot-insertion support	I_off and power-up 3-state prevent damaging current flow and bus conflicts during live module replacement in telecom or server backplanes
Latch-up immunity	Exceeds 500 mA per JESD17, ensuring robustness against transient overvoltage events in noisy industrial environments

Applications

Industrial Backplane Interface	Modular PLC I/O Expansion
Use Scenario: Interfacing 5-V sensor modules to a 3.3-V FPGA-based controller in a programmable logic controller rack. IC Role / Device Role / Timing Role: Level-translating buffer isolating legacy 5-V peripherals from low-voltage logic while maintaining signal integrity across 15-cm backplane traces. Use Value: Eliminates discrete level shifters and pull resistors, reducing component count by 6 parts per channel and enabling drop-in replacement of aging 74ACT125 designs.	Use Scenario: Hot-swappable I/O card with isolated analog/digital inputs connected to a central 3.3-V processor bus. IC Role / Device Role / Timing Role: 3-state bus buffer enabling safe insertion/removal without disrupting active communication on shared data lines. Use Value: I_off and power-up 3-state prevent bus contention and backfeed currents, meeting IEC 61000-4-2 Class 3 ESD requirements for field-replaceable units.
Automotive Body Control Module	Test Equipment Signal Conditioning
Use Scenario: Driving 5-V CAN transceiver enable signals from a 3.3-V microcontroller in a vehicle body control unit. IC Role / Device Role / Timing Role: Noninverting buffer with TTL-compatible output swing ensuring reliable logic-level translation under battery voltage sag (down to 2.7 V). Use Value: Guaranteed VOL ≤ 0.55 V at 64 mA sink current maintains noise margin > 0.7 V in 12-V automotive electrical environments.	Use Scenario: Conditioning digital stimulus signals from a 3.3-V pattern generator before injection into 5-V DUTs during ATE testing. IC Role / Device Role / Timing Role: Precision timing buffer with 4.1 ns t_PHL and matched propagation delays across all four channels. Use Value: Sub-5 ns skew enables synchronized multi-channel edge alignment critical for high-speed functional test vectors at 100 MHz.

Industrial Backplane Interface

Modular PLC I/O Expansion

Use Scenario: Interfacing 5-V sensor modules to a 3.3-V FPGA-based controller in a programmable logic controller rack.

IC Role / Device Role / Timing Role: Level-translating buffer isolating legacy 5-V peripherals from low-voltage logic while maintaining signal integrity across 15-cm backplane traces.

Use Value: Eliminates discrete level shifters and pull resistors, reducing component count by 6 parts per channel and enabling drop-in replacement of aging 74ACT125 designs.

Use Scenario: Hot-swappable I/O card with isolated analog/digital inputs connected to a central 3.3-V processor bus.

IC Role / Device Role / Timing Role: 3-state bus buffer enabling safe insertion/removal without disrupting active communication on shared data lines.

Use Value: I_off and power-up 3-state prevent bus contention and backfeed currents, meeting IEC 61000-4-2 Class 3 ESD requirements for field-replaceable units.

Automotive Body Control Module

Test Equipment Signal Conditioning

Use Scenario: Driving 5-V CAN transceiver enable signals from a 3.3-V microcontroller in a vehicle body control unit.

IC Role / Device Role / Timing Role: Noninverting buffer with TTL-compatible output swing ensuring reliable logic-level translation under battery voltage sag (down to 2.7 V).

Use Value: Guaranteed VOL ≤ 0.55 V at 64 mA sink current maintains noise margin > 0.7 V in 12-V automotive electrical environments.

Use Scenario: Conditioning digital stimulus signals from a 3.3-V pattern generator before injection into 5-V DUTs during ATE testing.

IC Role / Device Role / Timing Role: Precision timing buffer with 4.1 ns t_PHL and matched propagation delays across all four channels.

Use Value: Sub-5 ns skew enables synchronized multi-channel edge alignment critical for high-speed functional test vectors at 100 MHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC125A DBR	Lower drive strength (24 mA sink), no bus-hold, 1.65–3.6 V V_CC range	Suitable only where external pull resistors are acceptable and 5-V input tolerance is not required	Select when cost sensitivity outweighs 5-V interface capability and bus-hold convenience
74ALVC124APW	Quad inverting buffer with 3-state; identical V_CC and drive specs but inverted logic polarity	Requires logic inversion in upstream firmware or gate logic to maintain signal phase	Choose only if system architecture accommodates inverted control signals and PW package footprint is preferred

Compared with SN74LVC125A DBR and 74ALVC124APW, the SN74LVTH125DBRE4 uniquely combines 5-V tolerant inputs, bus-hold, and hot-insertion support in a single 14-pin SSOP device-enabling direct drop-in replacement in legacy 74HCT125-based designs without layout or firmware changes.

Availability

SN74LVTH125DBRE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular PLC I/O expansion, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTH125DBRE4 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 SN74LVTH125DBRE4 belongs to TI's LVTH logic family, engineered for mixed-voltage system interoperability-specifically bridging 3.3-V logic domains with legacy 5-V TTL infrastructure in space-constrained, thermally demanding applications.

FAQ

What is the maximum input voltage rating for SN74LVTH125DBRE4?

The SN74LVTH125DBRE4 supports input voltages up to 5.5 V regardless of V_CC level, enabling direct connection to 5-V TTL buses without external level-shifting circuitry. This specification is guaranteed across the full operating temperature range (−40°C to 85°C) and is validated per absolute maximum ratings in the official datasheet SCBS703I.

Does SN74LVTH125DBRE4 require external pullup resistors on its inputs?

No, SN74LVTH125DBRE4 does not require external pullup or pulldown resistors due to integrated bus-hold circuitry on all data inputs (pins 2, 5, 11, 14). This feature actively maintains valid logic states on undriven inputs, reducing BOM count and PCB area-confirmed in the Functional Description section of the SN74LVTH125DBRE4 datasheet.

Can SN74LVTH125DBRE4 be used in hot-swap applications?

Yes, SN74LVTH125DBRE4 is explicitly designed for hot-insertion use cases via two complementary features: I_off circuitry disables outputs when V_CC = 0 V to prevent back-current flow, and power-up 3-state forces outputs into high-impedance during V_CC ramp-up (0–1.5 V), eliminating bus contention-both verified in the Absolute Maximum Ratings and Recommended Operating Conditions tables.

What is the thermal resistance (θ_JA) of the SN74LVTH125DBRE4 package?

The SN74LVTH125DBRE4 in the SSOP (DB) package has a junction-to-ambient thermal resistance (θ_JA) of 96°C/W, measured per JESD51-7 standards. This value assumes standard JEDEC high-k board conditions and is critical for calculating maximum allowable power dissipation (e.g., 320 mW at 30°C ambient) in enclosed industrial enclosures.

How does the bus-hold function behave at V_CC = 2.7 V?

At minimum V_CC = 2.7 V, the SN74LVTH125DBRE4 bus-hold circuitry remains fully functional with ±75 µA holding current (per datasheet Section 4, II(hold)), ensuring stable input states even under brownout conditions. This behavior is validated across the full −40°C to 85°C temperature range and eliminates risk of metastability in undriven inputs during low-voltage operation.

SN74LVTH125DBRE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVTH

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

Packaging:: Tape & Reel (TR)

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-SSOP

SN74LVTH125DBRE4 FAQ

1.How can I place an order for SN74LVTH125DBRE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH125DBRE4 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 SN74LVTH125DBRE4 reliable?

The price and inventory of SN74LVTH125DBRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH125DBRE4 is usually 5 days.

3.What payment methods are accepted for SN74LVTH125DBRE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH125DBRE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTH125DBRE4?

SN74LVTH125DBRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH125DBRE4 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 SN74LVTH125DBRE4?

For technical support, including SN74LVTH125DBRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH125DBRE4 requirements.

6.How does Aetrix verify that SN74LVTH125DBRE4 is sourced from the original manufacturer or authorized distributors?

All SN74LVTH125DBRE4 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 SN74LVTH125DBRE4 meets industry standards.

7.What is the process for return or replacement of SN74LVTH125DBRE4?

All SN74LVTH125DBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH125DBRE4, 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 SN74LVTH125DBRE4 part is unused and in its original packaging.

Return procedure for SN74LVTH125DBRE4:

1.Submit a request within 90 days.

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

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