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

Texas Instruments 74AHCT1G125DBVRG4

Name: 74AHCT1G125DBVRG4
Brand: Texas Instruments
SKU: 74AHCT1G125DBVRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AHCT1G125DBVRG4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: SC-74A, SOT-753

Datasheet:: 74AHCT1G125DBVRG4.pdf

Description:: IC BUF NON-INVERT 5.5V SOT23-5

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Product details

Overview

74AHCT1G125DBVRG4 from Texas Instruments is a single 3-state bus buffer gate designed for level translation and signal isolation in 5V digital systems. It features TTL-compatible inputs, ±8mA output drive at 5V, 6ns max propagation delay, and operates across 4.5V–5.5V supply with ≤10µA ICC. It enables controlled data routing in server backplanes and industrial PLC I/O modules.

For engineers reviewing the 74AHCT1G125DBVRG4 datasheet, 74AHCT1G125DBVRG4 pinout, 74AHCT1G125DBVRG4 application, or 74AHCT1G125DBVRG4 equivalent, this page delivers verified functional identity, SOT-23-5 package mapping, confirmed 5-pin 3-state buffer behavior, real-world timing and drive specs, and two validated alternative parts for design flexibility.

Technical Context

The 74AHCT1G125DBVRG4 implements a noninverting single-channel buffer with active-low 3-state output enable (OE). Its TTL-compatible input thresholds (VIL = 0.8V, VIH = 2.0V) support reliable interfacing between 3.3V logic and 5V buses. The device uses CMOS technology with balanced output drive and intentionally slowed edge rates to suppress output ringing on lightly loaded traces.

Functional operation is defined by a two-input truth table: when OE = L, Y = A; when OE = H, Y = high-impedance. Power-up safety requires OE tied to VCC via pullup resistor to prevent bus contention during supply ramp. Thermal resistance (RθJA = 278°C/W) and ESD ratings (±1000V HBM, ±1500V CDM) are specified for the DBV package.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5V–5.5V - ensures compatibility with standard 5V TTL/CMOS rails and tolerance against ripple or droop.
Max Propagation Delay	6ns at 5V, CL = 15pF - supports >100MHz data rates in short-bus applications like sensor interface lines.
Output Drive	±8mA at 5V - sufficient to drive multiple 74-series inputs or moderate PCB trace capacitance without external buffering.
Input Compatibility	TTL voltage thresholds (VIH = 2.0V, VIL = 0.8V) - enables direct connection to legacy 3.3V microcontrollers or FPGAs without level shifters.
Quiescent Current	≤10µA ICC - minimizes standby power in always-on industrial control subsystems.
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive modules and industrial motor drives.
ESD Rating	±1000V HBM - meets basic handling robustness requirements for automated assembly environments.

Pinout & Package

SOT-23-5 (DBV) package: 2.9mm × 2.8mm footprint, 1.6mm body width, 0.6mm max height, gull-wing leads, JEDEC MO-178 compliant. RoHS-compliant NiPdAu lead finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1 - OE	Active-low 3-state enable	Drives output Y into high-Z when high; must be pulled up externally during power-up to avoid bus contention.
2 - A	Noninverting data input	Accepts TTL-level signals; input leakage ≤±1µA ensures minimal loading on driving source.
3 - GND	Ground reference	Single ground pin serves both logic and output stages; decoupling capacitor must be placed adjacent to Pin 5.
4 - Y	3-state buffered output	Delivers inverted or noninverted signal per function table; output clamp current ±20mA limits fault energy.
5 - VCC	Positive supply	5V nominal; bypassing with 0.1µF ceramic capacitor directly at pin reduces switching noise coupling.

Key Features

Feature	Design Value
TTL-compatible inputs	Enables direct interface with 3.3V microcontrollers in mixed-voltage 5V systems without external level shifters.
Controlled edge rates	Reduces output ringing and EMI on unterminated traces-critical for compact PCB layouts in test equipment.
Low quiescent power	10µA max ICC allows use in battery-backed monitoring circuits where standby current must stay below 20µA.
High-impedance isolation	Ensures clean bus arbitration in multi-driver configurations such as FPGA-to-ASIC communication links.
Industrial temperature range	–40°C to +125°C operation supports deployment in uncooled enclosures near power converters or motor drivers.

Applications

Server Backplane Buffering	Industrial PLC I/O Expansion
Use Scenario: Isolating control signals between hot-swap controller and management ASIC on a 1U server motherboard. IC Role / Device Role / Timing Role: Single-channel 3-state buffer enabling bidirectional signal gating during module insertion/removal sequences. Use Value: Prevents bus contention during partial power-up; 6ns tPD ensures timing margin for SMBus and PMBus protocols.	Use Scenario: Driving discrete 24V digital inputs from a 5V logic controller in a programmable logic controller rack. IC Role / Device Role / Timing Role: Level-translating buffer isolating field-side transients from sensitive MCU GPIO pins. Use Value: TTL-compatible inputs tolerate noisy 3.3V sensor outputs; ±8mA drive sustains signal integrity over 10cm ribbon cable runs.
Wireless Baseband Timing Interface	Test Equipment Signal Routing
Use Scenario: Synchronizing clock enable signals between FPGA fabric and RF transceiver IC in a small-cell base station. IC Role / Device Role / Timing Role: Noninverting buffer with precise 3-state control for glitch-free clock domain crossing. Use Value: 6ns max tPD and <1ns skew between tPLH/tPHL ensure setup/hold compliance for 100MHz DDR interfaces.	Use Scenario: Multiplexing DUT control lines in automated test fixtures where multiple instruments share a common bus. IC Role / Device Role / Timing Role: Bus-isolation gate enabling instrument-specific signal routing without hardware reconfiguration. Use Value: High-Z state eliminates crosstalk between channels; 125°C rating supports operation inside thermally constrained test chamber enclosures.

Server Backplane Buffering

Industrial PLC I/O Expansion

Use Scenario: Isolating control signals between hot-swap controller and management ASIC on a 1U server motherboard.

IC Role / Device Role / Timing Role: Single-channel 3-state buffer enabling bidirectional signal gating during module insertion/removal sequences.

Use Value: Prevents bus contention during partial power-up; 6ns tPD ensures timing margin for SMBus and PMBus protocols.

Use Scenario: Driving discrete 24V digital inputs from a 5V logic controller in a programmable logic controller rack.

IC Role / Device Role / Timing Role: Level-translating buffer isolating field-side transients from sensitive MCU GPIO pins.

Use Value: TTL-compatible inputs tolerate noisy 3.3V sensor outputs; ±8mA drive sustains signal integrity over 10cm ribbon cable runs.

Wireless Baseband Timing Interface

Test Equipment Signal Routing

Use Scenario: Synchronizing clock enable signals between FPGA fabric and RF transceiver IC in a small-cell base station.

IC Role / Device Role / Timing Role: Noninverting buffer with precise 3-state control for glitch-free clock domain crossing.

Use Value: 6ns max tPD and <1ns skew between tPLH/tPHL ensure setup/hold compliance for 100MHz DDR interfaces.

Use Scenario: Multiplexing DUT control lines in automated test fixtures where multiple instruments share a common bus.

IC Role / Device Role / Timing Role: Bus-isolation gate enabling instrument-specific signal routing without hardware reconfiguration.

Use Value: High-Z state eliminates crosstalk between channels; 125°C rating supports operation inside thermally constrained test chamber enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AHCT1G125DBVR	Same DBV package, identical electrical specs, Sn lead finish instead of NiPdAu; MSL Level-1 unchanged.	No functional difference; suitable for lead-free assembly but may require different reflow profile validation.	Select when Sn finish is mandated by internal process controls or legacy qualification requirements.
74LVC1G125DBVR	Lower VCC range (1.65V–5.5V), higher speed (4.4ns tPD), but only ±24mA drive at 3.3V-not rated for 5V operation.	Not drop-in for 5V-only systems; requires redesign if VCC drops below 4.5V or if 5V bus drive is essential.	Choose only for dual-supply or 3.3V-centric designs where lower power and faster timing outweigh 5V compatibility needs.

Compared with SN74AHCT1G125DBVR and 74LVC1G125DBVR, the 74AHCT1G125DBVRG4 provides guaranteed 5V operation with TTL input compatibility and industrial temperature support-making it the preferred choice for legacy 5V infrastructure upgrades and harsh-environment deployments where voltage margin and interoperability are critical.

Availability

74AHCT1G125DBVRG4 is available at Aetrix Electronics and suitable for server backplane buffering, industrial PLC I/O expansion, and wireless baseband timing interface requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT1G125DBVRG4 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 with emphasis on reliability, longevity, and industrial-grade qualification.

The SN74AHCT family targets 5V logic interface applications requiring TTL compatibility, low power, and robust 3-state control-designed specifically for industrial automation, communications infrastructure, and computing platforms where signal integrity and supply margin are non-negotiable.

FAQ

What is the recommended power-up sequence for the 74AHCT1G125DBVRG4?

TI recommends tying OE to VCC via a pullup resistor during power-up to force the output into high-impedance state before logic levels stabilize. For the 74AHCT1G125DBVRG4, a 10kΩ resistor suffices given its ≤1µA input leakage. This prevents bus contention when upstream drivers power up at different rates. The 74AHCT1G125DBVRG4 datasheet specifies this in Section 7.1 as mandatory for safe initialization.

Does the 74AHCT1G125DBVRG4 support 3.3V-only operation?

No-the 74AHCT1G125DBVRG4 requires VCC between 4.5V and 5.5V per Section 5.3 of its datasheet. While its inputs are TTL-compatible and accept 3.3V logic levels, the core circuitry is not functional below 4.5V. Using it at 3.3V will result in undefined output states and excessive ICC. For 3.3V systems, consider the 74LVC1G125DBVR instead-but note it lacks 5V tolerance.

Can the 74AHCT1G125DBVRG4 drive a 50pF load within timing specifications?

Yes-the 74AHCT1G125DBVRG4 maintains tPLH/tPHL ≤9.5ns and tPZH/tPZL ≤11ns at CL = 50pF and VCC = 5V, as verified in Table 5.6. These values remain within specification across –40°C to +125°C. However, layout-induced parasitics must be minimized: keep traces short, avoid stubs, and place the 0.1µF bypass capacitor within 2mm of Pin 5 to preserve edge fidelity.

What is the maximum continuous output current rating for the 74AHCT1G125DBVRG4?

The absolute maximum continuous output current per pin is ±25mA (Section 5.1), but the recommended operating condition limits steady-state drive to ±8mA at 5V (Section 5.3). Exceeding ±8mA risks violating VOH/VOL specs and increasing junction temperature beyond safe limits. The 74AHCT1G125DBVRG4 thermal data shows RθJA = 278°C/W-so sustained ±25mA could raise Tj by >65°C above ambient even with minimal PCB copper.

Is the 74AHCT1G125DBVRG4 pin-compatible with other SOT-23-5 logic gates?

Yes-the 74AHCT1G125DBVRG4 uses the industry-standard SOT-23-5 pinout (OE-A-GND-Y-VCC), matching TI's SN74AHCT1G00, SN74AHCT1G02, and SN74AHCT1G04. However, logic function and enable polarity differ: the 74AHCT1G125DBVRG4 has active-low OE and noninverting behavior, whereas gates like the 74AHCT1G00 have no OE and fixed NAND logic. Always verify truth tables before substitution.

74AHCT1G125DBVRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AHCT

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 1

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 8mA, 8mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

74AHCT1G125DBVRG4 FAQ

1.How can I place an order for 74AHCT1G125DBVRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AHCT1G125DBVRG4 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 74AHCT1G125DBVRG4 reliable?

The price and inventory of 74AHCT1G125DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT1G125DBVRG4 is usually 5 days.

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74AHCT1G125DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AHCT1G125DBVRG4 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 74AHCT1G125DBVRG4?

For technical support, including 74AHCT1G125DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT1G125DBVRG4 requirements.

6.How does Aetrix verify that 74AHCT1G125DBVRG4 is sourced from the original manufacturer or authorized distributors?

All 74AHCT1G125DBVRG4 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 74AHCT1G125DBVRG4 meets industry standards.

7.What is the process for return or replacement of 74AHCT1G125DBVRG4?

All 74AHCT1G125DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT1G125DBVRG4, 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 74AHCT1G125DBVRG4 part is unused and in its original packaging.

Return procedure for 74AHCT1G125DBVRG4:

1.Submit a request within 90 days.

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

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