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

NXP Semiconductors 74AHCT125D,112

Name: 74AHCT125D,112
Brand: NXP Semiconductors
SKU: 74AHCT125D,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AHCT125D,112

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: 74AHCT125D,112.pdf

Description:: IC BUFFER NON-INVERT 5.5V 14SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74AHCT125D,112 from Nexperia is a quad 3-state buffer/line driver with TTL-compatible inputs and CMOS outputs, operating from 4.5 V to 5.5 V supply. It features four independent channels, each with active-low output enable (nOE), overvoltage-tolerant inputs up to 5.5 V, and propagation delay as low as 3.0 ns at 5 V/15 pF. It is used in bidirectional bus interfacing, level translation between 3.3 V and 5 V domains, and address/data line driving in industrial microcontroller systems.

For engineers reviewing the 74AHCT125D,112 datasheet, 74AHCT125D,112 pinout, 74AHCT125D,112 application, or 74AHCT125D,112 equivalent, this device serves as a voltage-level translating buffer for mixed-supply digital systems requiring precise timing control, high noise immunity, and robust 3-state bus management under -40 °C to +125 °C conditions.

Technical Context

The 74AHCT125D,112 implements four identical non-inverting buffer stages, each controlled by a dedicated active-low output enable input (1OE–4OE). Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure compatibility with legacy 5 V logic families while delivering CMOS-level output drive strength (±8 mA).

Each channel transitions between low-impedance drive and high-impedance OFF-state with enable timing parameters tightly specified: t_en ≤ 7.3 ns and t_dis ≤ 11.0 ns (VCC = 5 V, CL = 50 pF), enabling fast bus arbitration in synchronous data transfer applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures reliable operation across standard 5 V rail tolerances and brown-out margins.
Input Thresholds	VIH = 2.0 V min, VIL = 0.8 V max - Guarantees interoperability with TTL and 5 V CMOS logic families.
Propagation Delay	3.0 ns typ (5 V, 15 pF) - Supports >100 MHz data rates in short-trace digital interfaces.
Output Drive	±8.0 mA - Sufficient to drive 50 pF loads with <0.55 V VOL and >3.70 V VOH at full temperature range.
Operating Temperature	-40 °C to +125 °C - Qualified for under-hood industrial and extended-temperature embedded control environments.
Input Overvoltage Tolerance	Up to 5.5 V - Allows safe interfacing with higher-voltage signals without external clamping.
ESD Protection	HBM >2000 V, CDM >1000 V - Reduces risk of handling damage during PCB assembly and rework.

Pinout & Package

74AHCT125D,112 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width. Pin 1 is marked by a beveled corner or notch; the package is RoHS-compliant and lead-free.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	1OE, 2OE, 3OE, 4OE	Active-low output enable inputs - Each controls one buffer's 3-state output independently.
2, 5, 9, 12	1A, 2A, 3A, 4A	Data inputs - TTL-compatible, overvoltage-tolerant to 5.5 V regardless of VCC.
3, 6, 8, 11	1Y, 2Y, 3Y, 4Y	Buffered outputs - CMOS-level, capable of sourcing/sinking ±8 mA with rail-to-rail swing.
7	GND	Ground reference - Must be connected to system 0 V plane; decoupling capacitor recommended adjacent to pin.
14	VCC	Positive supply - Requires local 100 nF ceramic decoupling between pins 7 and 14 for stable switching.

Key Features

Feature	Design Value
TTL-compatible inputs	Enables direct connection to legacy 5 V microcontrollers and FPGAs without level-shifting circuitry.
Overvoltage-tolerant inputs	Accepts up to 5.5 V on any input pin even when VCC = 4.5 V - simplifies mixed-voltage board design.
Balanced propagation delays	t_PLH and t_PHL match within 0.5 ns (5 V, 15 pF) - minimizes skew in parallel data paths.
High noise immunity	Input hysteresis and >40 % noise margin at VCC = 5 V - suppresses false triggering in electrically noisy environments.
Latch-up immunity	Exceeds 100 mA per JESD78 Class II Level A - prevents destructive latch-up during transient overvoltage events.

Applications

Industrial PLC I/O Expansion

Microcontroller Bus Isolation

Use Scenario: Expanding GPIO count on an ARM Cortex-M4-based controller by adding parallel I/O via 74AHCT125D,112-driven address/data latches.

IC Role / Device Role / Timing Role: Acts as a direction-controlled buffer between MCU data bus and peripheral latch inputs, enabling clean write strobe timing and preventing bus contention.

Use Value: Enables deterministic 3-state control with sub-7 ns enable/disable transitions, eliminating metastability during bus handoff sequences.

Use Scenario: Isolating a 5 V sensor interface bus from a 3.3 V host MCU using bidirectional level translation.

IC Role / Device Role / Timing Role: Provides unidirectional buffering with TTL input thresholds and CMOS output drive, allowing safe signal injection into the 3.3 V domain via pull-up resistors.

Use Value: Eliminates need for discrete MOSFET translators; overvoltage tolerance permits direct connection to 5 V sensors without external protection diodes.

Legacy System Interface Adapter

Test Equipment Signal Conditioning

Use Scenario: Interfacing a modern FPGA development board (3.3 V I/O) to legacy 5 V test instrumentation with TTL signaling standards.

IC Role / Device Role / Timing Role: Functions as a 5 V–tolerant input receiver and 3.3 V–compatible output driver, synchronized to FPGA clock domain.

Use Value: Delivers 3.0 ns propagation delay and <0.55 V VOL at 8 mA load - ensures setup/hold compliance for 50 MHz control signals.

Use Scenario: Driving multiple 50 Ω coaxial lines from a single logic output in automated test equipment (ATE) stimulus modules.

IC Role / Device Role / Timing Role: Serves as a fanout buffer with matched rise/fall times and low output impedance (<20 Ω typical), minimizing signal reflections.

Use Value: Maintains <100 ps skew across all four channels and supports 100+ million cycles lifetime under continuous 5 V/8 mA switching stress.

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
SN74AHCT125DR	TI part with identical pinout, same 4.5–5.5 V range and TTL input thresholds, but slightly higher ICC (max 40 μA vs. 20 μA at 5.5 V).	Valid for drop-in replacement where layout allows SOIC-14 footprint; preferred in TI-centric BOMs or where dual-sourcing is required.	Select when TI qualification documentation or long-term availability assurance is mandated by procurement policy.
74AHC125D,112	Nexperia variant with CMOS-level inputs (VIH = 3.85 V min), wider 2.0–5.5 V supply range, and lower static current (ICC ≤ 2.0 μA typ).	Suitable for mixed 3.3 V/5 V systems where input voltage may exceed 2.0 V but fall below 2.0 V TTL threshold - e.g., battery-backed logic rails.	Choose when operating below 4.5 V or requiring ultra-low quiescent current in always-on monitoring circuits.

Compared with SN74AHCT125DR and 74AHC125D,112, the 74AHCT125D,112 offers optimal balance of TTL compatibility, low dynamic power (CPD = 12 pF), and guaranteed 125 °C operation - making it the preferred choice for industrial bus drivers where input voltage predictability and thermal margin are critical.

Availability

74AHCT125D,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller bus isolation, legacy system interface adapters, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT125D,112 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AHCT125 series belongs to Nexperia's advanced logic portfolio, designed specifically for robust voltage translation and bus-driving tasks in harsh-temperature industrial control and automation systems.

FAQ

What is the maximum output current capability of 74AHCT125D,112?

The 74AHCT125D,112 delivers ±8.0 mA output current per channel at VCC = 4.5 V, with VOL ≤ 0.55 V and VOH ≥ 3.70 V across the full -40 °C to +125 °C operating range. This rating applies under steady-state DC conditions and supports reliable driving of standard 50 pF loads with defined logic thresholds.

Can 74AHCT125D,112 operate with a 3.3 V supply?

No - the 74AHCT125D,112 is TTL-input optimized and specified only for 4.5 V to 5.5 V supply operation. At 3.3 V, its VIH minimum (2.0 V) would not be met with sufficient margin, risking unreliable HIGH detection. For 3.3 V systems, use the pin-compatible 74AHC125D,112 variant instead.

Is the SO14 package of 74AHCT125D,112 RoHS-compliant and lead-free?

Yes - the 74AHCT125D,112 in SOT108-1 (SO14) packaging is fully RoHS-compliant and lead-free per Nexperia's product compliance documentation (document ID 74AHC_AHCT125 Rev. 9). The package uses matte tin termination and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements.

How does the 3-state enable timing affect bus arbitration in multi-driver systems?

The 74AHCT125D,112 guarantees t_en ≤ 7.3 ns and t_dis ≤ 11.0 ns (VCC = 5 V, CL = 50 pF), ensuring rapid, predictable transition between driven and high-Z states. This enables deterministic bus turnaround in half-duplex protocols like SPI slave select or shared address/data buses, reducing dead-time overhead and preventing bus contention glitches.

74AHCT125D,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74AHCT

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Bulk

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:: 8mA, 8mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SO

74AHCT125D,112 FAQ

1.How can I place an order for 74AHCT125D,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AHCT125D,112 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 74AHCT125D,112 reliable?

The price and inventory of 74AHCT125D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT125D,112 is usually 5 days.

3.What payment methods are accepted for 74AHCT125D,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT125D,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74AHCT125D,112?

74AHCT125D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AHCT125D,112 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 74AHCT125D,112?

For technical support, including 74AHCT125D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT125D,112 requirements.

6.How does Aetrix verify that 74AHCT125D,112 is sourced from the original manufacturer or authorized distributors?

All 74AHCT125D,112 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 74AHCT125D,112 meets industry standards.

7.What is the process for return or replacement of 74AHCT125D,112?

All 74AHCT125D,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT125D,112, 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 74AHCT125D,112 part is unused and in its original packaging.

Return procedure for 74AHCT125D,112:

1.Submit a request within 90 days.

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

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