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

Diodes Incorporated 74HCT126S14-13

Name: 74HCT126S14-13
Brand: Diodes Incorporated
SKU: 74HCT126S14-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HCT126S14-13

Manufacturer:: Diodes Incorporated

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74HCT126S14-13.pdf

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

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Product details

Overview

74HCT126S14-13 from Diodes Incorporated is a quadruple 3-state buffer IC with independent active-high enable inputs, designed for bidirectional bus interfacing in 4.5V–5.5V TTL-compatible digital systems. It delivers 4mA output drive at V_CC = 4.5V, features Schmitt-trigger inputs for noise immunity, and operates across –40°C to +125°C ambient temperature - commonly deployed in PC motherboard I/O buffering and peripheral data bus isolation.

For engineers reviewing the 74HCT126S14-13 datasheet, 74HCT126S14-13 pinout, 74HCT126S14-13 application, or 74HCT126S14-13 equivalent, key selection criteria include guaranteed 3-state leakage (±5 µA), propagation delay ≤25 ns (typ) at 4.5V, input voltage compatibility with legacy LSTTL logic, and SO-14 package suitability for through-hole and reflow assembly in industrial control backplanes.

Technical Context

The 74HCT126 implements four identical non-inverting buffer channels, each with dedicated active-high output-enable (OE) control enabling independent tri-state management per channel. All inputs exhibit Schmitt-trigger action, providing hysteresis of ~0.4V for robust noise rejection on slow-rising or noisy control signals.

It uses HCMOS technology with TTL-level input thresholds (V_IL = 0.8V max, V_IH = 2.0V min), ensuring direct interface with 5V LSTTL outputs without level-shifting. Output drive capability is specified for both sourcing (I_OH = –4mA) and sinking (I_OL = 4mA) under worst-case V_CC = 4.5V conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5V to 5.5V - ensures compatibility with standard 5V TTL/CMOS rails and tolerance to supply ripple.
Propagation Delay t_PD	≤25 ns (typ) at V_CC = 4.5V, CL = 50pF - supports >20 MHz bus operation in synchronous data transfer paths.
Output Drive	±4mA at V_CC = 4.5V - sufficient to drive 10 LSTTL loads or terminate short PCB traces without external buffers.
3-State Leakage I_OZ	±5 µA max at V_CC = 5.5V - minimizes bus contention current when multiple devices share a common data line.
Input Hysteresis	~0.4V (Schmitt-trigger) - rejects up to 400mV of ground bounce or EMI on enable and data lines.
Operating Temp	–40°C to +125°C - validated for use in extended-temperature industrial motor controllers and automotive body ECUs.

Pinout & Package

74HCT126S14-13 is supplied in a 14-pin Small Outline (SO-14) package with 1.27 mm pitch, 8.6 mm × 3.9 mm body, and gull-wing leads suitable for automated optical inspection and wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	OE (Active-High Enable)	Independent per-channel control: logic HIGH enables output; LOW forces high-impedance state.
2, 5, 9, 12	A (Input)	Non-inverting data input with TTL-compatible thresholds and Schmitt-trigger hysteresis.
3, 6, 8, 11	Y (Output)	3-state buffered output capable of sourcing/sinking ±4mA with rail-to-rail swing.
7	GND	Reference return for all logic and power paths; must be low-inductance connection to minimize switching noise.
14	V_CC	Positive supply rail; requires local 100nF ceramic decoupling within 5 mm of pin.

Key Features

Feature	Design Value
TTL-compatible inputs	V_IL ≤ 0.8V / V_IH ≥ 2.0V - eliminates need for external level shifters when interfacing with legacy 74LS or 74F families.
Independent 3-state control	Four separate OE pins - enables dynamic bus arbitration and partial subsystem power-down without global reset.
Low ICC quiescent current	20 µA typical at V_CC = 6.0V - reduces standby power in always-on I/O hubs and USB host controllers.
ESD robustness	2 kV HBM, 1 kV CDM - exceeds JEDEC standards for handling in manual assembly and field-replaceable module integration.

Applications

PC Motherboard I/O Buffering

Industrial PLC Backplane Interface

Use Scenario: Isolating legacy parallel port or PS/2 keyboard/mouse signals between southbridge and external connectors.

IC Role / Device Role / Timing Role: Bidirectional 3-state buffer managing shared data lines while preventing bus contention during hot-plug events.

Use Value: Enables clean signal integrity with <25 ns propagation delay and ±4mA drive, eliminating need for discrete pull-ups or bus transceivers.

Use Scenario: Interfacing microcontroller GPIOs to modular I/O expansion cards via DIN-rail mounted backplanes.

IC Role / Device Role / Timing Role: Level-translating and bus-isolating buffer with Schmitt-trigger inputs to reject noise from 24V relay switching transients.

Use Value: 0.4V input hysteresis suppresses >400mV of coupled noise, and –40°C to +125°C rating ensures reliability in uncooled control cabinets.

Optical Network Terminal (ONT) Management Bus

Digital TV Set-Top Box Front Panel Control

Use Scenario: Buffering I²C or SMBus signals between baseband SoC and EPON/GPON PHY management registers.

IC Role / Device Role / Timing Role: Low-capacitance (3.5 pF) input buffer preserving rise/fall times on multi-drop control buses.

Use Value: 24 pF typical power dissipation capacitance minimizes loading on 100 kHz–400 kHz management buses, maintaining timing margin.

Use Scenario: Driving LED indicators and reading push-button inputs on IR receiver front panels with long flex-cable runs.

IC Role / Device Role / Timing Role: Noise-immune input conditioner and LED sink driver with independent per-channel enable for power-gated status lights.

Use Value: Schmitt-trigger inputs tolerate >100 ns edge jitter on flex cables; ±4mA output directly drives common-anode LEDs without series resistors.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT126N	Same logic function and pinout; TI version uses different process, resulting in slightly higher ICC (max 40 µA vs. Diodes' 20 µA typ).	Identical SO-14 footprint but not qualified to same AEC-Q100 stress test levels as Diodes' industrial-grade variant.	Preferred for cost-sensitive consumer designs where full industrial temp range is not required.
74HCT125S14-13	Quad buffer with active-low enables (1OE–4OE); otherwise identical electrical specs and package.	Requires inverted enable logic in firmware/hardware; unsuitable for direct replacement without signal inversion.	Select when system already uses active-low control architecture and board layout cannot accommodate OE polarity change.

Compared with SN74HCT126N and 74HCT125S14-13, the 74HCT126S14-13 offers lower typical supply current and native active-high enable compatibility - simplifying control logic in new designs targeting extended temperature operation and low-power standby modes.

Availability

74HCT126S14-13 is available at Aetrix Electronics and suitable for PC motherboard I/O buffering, industrial PLC backplane interface, and optical network terminal management bus applications requiring stable component supply and long-term manufacturing continuity.

Supply support for 74HCT126S14-13 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The 74HCT logic family targets industrial and computing applications requiring TTL-compatible CMOS performance, low power, and robust ESD protection - optimized for reliable bus interfacing in harsh electromagnetic environments.

FAQ

What is the maximum clock frequency supported by the 74HCT126S14-13?

The 74HCT126S14-13 is not a clocked device and has no internal clock; its usable data rate depends on propagation delay and load capacitance. With t_PD ≤25 ns (typ) and CL = 50 pF, it supports clean signal transmission up to ~20 MHz in point-to-point configurations, assuming proper termination and layout.

Can the 74HCT126S14-13 operate at 3.3V?

No - the 74HCT126S14-13 is specified only for 4.5V to 5.5V operation. At 3.3V, input thresholds become undefined, output drive falls below specification, and DC parameters such as V_OH and V_OL are not guaranteed. Use 74LVC126 or 74ALVC126 for 3.3V systems.

Is the SO-14 package RoHS-compliant and lead-free?

Yes - the 74HCT126S14-13 is fully RoHS 2 compliant (2011/65/EU), totally lead-free with no purposely added lead, and classified as "Green" per Diodes' definition: Br < 900 ppm, Cl < 900 ppm (Br+Cl < 1500 ppm), Sb < 1000 ppm.

How should unused inputs be handled?

Unused inputs must be tied to either V_CC or GND - floating inputs may cause excessive ICC, erratic output states, or increased EMI susceptibility due to internal CMOS gate instability. This requirement is explicitly stated in the Recommended Operating Conditions section of the datasheet.

74HCT126S14-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: 74HCT

Package/Case:: 14-SOIC (0.154", 3.90mm 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:: 4mA, 4mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SO

74HCT126S14-13 FAQ

1.How can I place an order for 74HCT126S14-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HCT126S14-13 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 74HCT126S14-13 reliable?

The price and inventory of 74HCT126S14-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT126S14-13 is usually 5 days.

3.What payment methods are accepted for 74HCT126S14-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT126S14-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HCT126S14-13?

74HCT126S14-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HCT126S14-13 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 74HCT126S14-13?

For technical support, including 74HCT126S14-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT126S14-13 requirements.

6.How does Aetrix verify that 74HCT126S14-13 is sourced from the original manufacturer or authorized distributors?

All 74HCT126S14-13 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 74HCT126S14-13 meets industry standards.

7.What is the process for return or replacement of 74HCT126S14-13?

All 74HCT126S14-13 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT126S14-13, 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 74HCT126S14-13 part is unused and in its original packaging.

Return procedure for 74HCT126S14-13:

1.Submit a request within 90 days.

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

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