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

Diodes Incorporated 74AHCT125T14-13

Name: 74AHCT125T14-13
Brand: Diodes Incorporated
SKU: 74AHCT125T14-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AHCT125T14-13

Manufacturer:: Diodes Incorporated

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74AHCT125T14-13.pdf

Description:: IC BUF NON-INVERT 5.5V 14TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:2,484

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Product details

Overview

74AHCT125T14-13 from Diodes Incorporated is a quadruple 3-state buffer IC with independent active-low enable inputs, designed for 4.5V–5.5V TTL-compatible logic interfacing in bus-driven systems. It delivers 8mA output drive at V_CC = 4.5V, features Schmitt-trigger inputs for noise immunity, and operates across –40°C to +125°C ambient temperature. Used in PC motherboard data bus isolation and peripheral I/O expansion.

For engineers reviewing the 74AHCT125T14-13 datasheet, 74AHCT125T14-13 pinout, 74AHCT125T14-13 application, or 74AHCT125T14-13 equivalent, key selection criteria include 3-state timing (t_EN/t_DIS ≤ 11.5ns), input voltage compatibility (V_IL = 0.8V, V_VIH = 2.0V), leakage current (±2.5μA), power dissipation capacitance (14.8pF), and TSSOP-14 thermal performance.

Technical Context

The 74AHCT125T14-13 implements four non-inverting buffer channels, each with dedicated active-low 3-state enable (OE) control-no shared enable logic. All inputs incorporate Schmitt-trigger action, providing hysteresis (typ. 0.3V) to reject slow-rising or noisy signals without external filtering.

It uses advanced CMOS process technology to achieve TTL-level input thresholds while maintaining low static current (I_CC ≤ 40μA) and high noise immunity. Output stages are fully specified for ±8mA sink/source at V_CC = 4.5V, supporting direct connection to legacy 5V TTL loads without level-shifting.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5V to 5.5V - ensures compatibility with standard 5V logic rails and tolerates supply ripple up to ±0.5V
Output Drive	±8mA at V_CC = 4.5V - sufficient to drive 10 LSTTL loads or terminate short PCB traces
t_PD (max)	7.0ns @ CL = 15pF - enables reliable operation in 100MHz+ address/data bus switching
t_EN/t_DIS	11.5ns / 8.5ns max @ CL = 15pF - supports precise bus arbitration timing in multi-master systems
I_OZ Leakage	±2.5μA @ V_CC = 5.5V - minimizes signal contention current during Z-state sharing on common buses
C_pd	14.8pF per gate - determines dynamic power draw (P_dyn ≈ C_pd × V² × f) at 1MHz switching
Operating Temp	–40°C to +125°C - qualified for industrial-grade embedded control and storage subsystems

Pinout & Package

TSSOP-14 package: 4.9mm × 4.4mm body, 0.65mm pitch, 1.2mm height, lead-free and RoHS-compliant. Designed for high-density PCB layouts with improved thermal resistance vs. SO-14.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13 (1OE, 2OE, 3OE, 4OE)	Active-low 3-state enable	Drives corresponding Y output to high-impedance when HIGH; enables buffer when LOW
2, 5, 9, 12 (1A, 2A, 3A, 4A)	Non-inverting data input	Accepts TTL-compatible logic levels (0.8V/2.0V thresholds); Schmitt-triggered
3, 6, 8, 11 (1Y, 2Y, 3Y, 4Y)	Buffered non-inverting output	Drives bus or load with ±8mA capability; enters Z-state when OE = HIGH
7	GND	Reference return path for all I/O and internal logic; must be low-inductance connection
14	V_CC	Primary power supply pin; requires local 100nF ceramic decoupling within 5mm

Key Features

Feature	Design Value
Schmitt-trigger inputs	Provides 0.3V typical hysteresis to suppress noise-induced glitches on slow or unterminated lines
TTL-compatible input thresholds	V_IL ≤ 0.8V and V_IH ≥ 2.0V ensure interoperability with legacy 5V TTL and CMOS families
Low-power CMOS design	I_CC ≤ 40μA at 5.5V enables use in always-on system management controllers
ESD robustness	2kV HBM, 1kV CDM, 200V MM ratings reduce field failure risk in handling and assembly
Industrial temperature range	Specified operation from –40°C to +125°C ambient supports fanless industrial enclosures

Applications

PC Motherboard Bus Isolation

Hard Disk Drive Interface Logic

Use Scenario: Isolating CPU address/data bus segments during DMA transfers to prevent contention.

IC Role / Device Role / Timing Role: 3-state buffer enabling/disabling bidirectional data paths under chipset control.

Use Value: Prevents bus conflicts with t_DIS ≤ 8.5ns, allowing sub-10ns arbitration window for multi-controller access.

Use Scenario: Level-shifting and buffering ATA/IDE control signals (IOR#, IOW#, RESET#) between host controller and drive.

IC Role / Device Role / Timing Role: Non-inverting buffer with TTL-compatible inputs driving legacy parallel ATA interface lines.

Use Value: Delivers ±8mA drive into 50Ω trace impedance, ensuring clean edge integrity over 10cm ribbon cables.

Notebook Peripheral Expansion

DVD-ROM Controller Interface

Use Scenario: Enabling USB hub or card reader logic on shared LPC or eSPI bus segments.

IC Role / Device Role / Timing Role: Quad buffer isolating low-speed peripheral control lines from main chipset.

Use Value: Independent OE pins allow selective activation of individual functions (e.g., only SD card detect line enabled).

Use Scenario: Driving DVD-ROM drive enable, motor control, and status signals from embedded microcontroller.

IC Role / Device Role / Timing Role: 3-state output buffer interfacing MCU GPIO to opto-isolated or relay driver stages.

Use Value: Z-state leakage < ±2.5μA prevents false triggering of downstream optocouplers during standby.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AHCT125PW	TSSOP-14, identical logic function and DC specs; TI's version has slightly higher t_PD (8.5ns vs. 7.0ns max)	Same industrial temp range but lower ESD rating (1.5kV HBM vs. 2kV)	Preferred where TI ecosystem support or existing BOM alignment is required
74LVC125AT14-13	Lower V_CC range (1.65–3.6V); not 5V-tolerant; 24mA drive; no Schmitt inputs	Designed for 3.3V-only systems; unsuitable for mixed 5V/TTL environments	Select only for new 3.3V designs requiring higher drive and smaller geometry

Compared with SN74AHCT125PW and 74LVC125AT14-13, the 74AHCT125T14-13 uniquely combines 5V TTL compatibility, Schmitt-trigger noise immunity, and best-in-class 3-state timing-making it optimal for legacy 5V bus isolation where signal integrity and backward compatibility are critical.

Availability

74AHCT125T14-13 is available at Aetrix Electronics and suitable for PC motherboard bus isolation, hard disk drive interface logic, and notebook peripheral expansion requiring stable component supply and long-term industrial availability.

Supply support for 74AHCT125T14-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-qualified components for computing, industrial, and consumer applications.

The AHCT logic family targets 5V mixed-signal systems needing TTL-compatible inputs, low power, and robust noise immunity-designed specifically for legacy interface bridging and bus management in storage and computing platforms.

FAQ

What is the maximum clock frequency supported by the 74AHCT125T14-13?

The 74AHCT125T14-13 is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate depends on propagation delay (t_PD ≤ 7.0ns) and load capacitance. With 15pF load, it reliably supports toggle frequencies up to ~70MHz in point-to-point configurations, assuming proper termination and layout.

Can unused inputs be left floating?

No. Per Diodes' Recommended Operating Conditions, all unused inputs must be tied to V_CC or GND to prevent oscillation, excessive current draw, or undefined logic states. Floating inputs may cause increased ICC, thermal stress, or erratic 3-state behavior due to Schmitt-trigger metastability.

Is the 74AHCT125T14-13 5V-tolerant on inputs when operated at 3.3V?

No. The 74AHCT125T14-13 is specified only for V_CC = 4.5V–5.5V operation. Input absolute maximum rating is –0.5V to +7.0V, but functional operation-including VIH/VIL thresholds-is guaranteed only within the recommended V_CC range. It must not be powered at 3.3V.

Does this part support hot-swap or live-insertion?

No. The 74AHCT125T14-13 lacks hot-swap protection features such as power-up sequencing control, I_OFF isolation, or back-drive immunity. Applying V_CC while signals are present may exceed absolute maximum ratings and cause latch-up or ESD damage.

74AHCT125T14-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: 74AHCT

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

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:: 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-TSSOP

74AHCT125T14-13 FAQ

1.How can I place an order for 74AHCT125T14-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AHCT125T14-13 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 74AHCT125T14-13 reliable?

The price and inventory of 74AHCT125T14-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT125T14-13 is usually 5 days.

3.What payment methods are accepted for 74AHCT125T14-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT125T14-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74AHCT125T14-13?

74AHCT125T14-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AHCT125T14-13 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 74AHCT125T14-13?

For technical support, including 74AHCT125T14-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT125T14-13 requirements.

6.How does Aetrix verify that 74AHCT125T14-13 is sourced from the original manufacturer or authorized distributors?

All 74AHCT125T14-13 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 74AHCT125T14-13 meets industry standards.

7.What is the process for return or replacement of 74AHCT125T14-13?

All 74AHCT125T14-13 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT125T14-13, 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 74AHCT125T14-13 part is unused and in its original packaging.

Return procedure for 74AHCT125T14-13:

1.Submit a request within 90 days.

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

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