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

Diodes Incorporated 74AHCT126S14-13

Name: 74AHCT126S14-13
Brand: Diodes Incorporated
SKU: 74AHCT126S14-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AHCT126S14-13

Manufacturer:: Diodes Incorporated

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74AHCT126S14-13.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74AHCT126S14-13 from Diodes Incorporated is a quadruple 3-state non-inverting buffer IC with independent active-high enable inputs, operating at 4.5V–5.5V supply, delivering ±8mA drive strength at V_CC = 4.5V, featuring Schmitt-trigger inputs and TTL-compatible logic thresholds. It is used in bus interface isolation and data routing in PC peripheral control circuits.

For engineers reviewing the 74AHCT126S14-13 datasheet, 74AHCT126S14-13 pinout, 74AHCT126S14-13 application, or 74AHCT126S14-13 equivalent, key selection factors include its 3-state output control timing (t_EN ≤ 6.5 ns, t_DIS ≤ 8.5 ns @ −40°C to +85°C), input hysteresis for noise immunity, and SO-14 package compatibility with legacy 74-series footprint layouts.

Technical Context

The 74AHCT126S14-13 implements four independent non-inverting buffers, each with dedicated active-high OE control enabling high-impedance output states. Its CMOS design ensures low static current (I_CC ≤ 40 µA) while maintaining TTL-level input compatibility and rail-to-rail output swing.

All inputs incorporate Schmitt-trigger action with typical hysteresis of 0.5 V, ensuring robust noise rejection in noisy digital environments. Propagation delay is specified at 3.0 ns (typ) and 5.5 ns (max) under CL = 15 pF load at V_CC = 4.5V–5.5V and TA = −40°C to +85°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS systems and tolerance against rail droop.
Output Drive	±8 mA at V_CC = 4.5 V - Sufficient to drive multiple LSTTL loads or moderate PCB trace capacitance without buffering.
Propagation Delay	5.5 ns max (CL = 15 pF, TA = −40°C to +85°C) - Supports >100 MHz bus toggle rates in point-to-point configurations.
Enable/Disable Time	t_EN ≤ 6.5 ns, t_DIS ≤ 8.5 ns (CL = 15 pF, TA = −40°C to +85°C) - Enables precise bus arbitration timing in shared-data-path applications.
Input Hysteresis	Typical 0.5 V - Rejects up to 500 mV of common-mode noise on control or data lines without false triggering.
ESD Protection	2 kV HBM, 1 kV CDM, 200 V MM - Meets industrial IEC 61000-4-2 level 3 immunity requirements without external protection.
Power Dissipation	500 mW absolute max - Allows full-channel operation at +125°C ambient with minimal derating in SO-14 package.

Pinout & Package

74AHCT126S14-13 is housed in a 14-pin Small Outline (SO-14) package with 1.27 mm pitch, JEDEC MS-012AC compliant, 8.53–8.74 mm body length, and 3.80–3.99 mm width. Pin 1 marked by notch or bevel; pin 7 = GND, pin 14 = V_CC.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	OE (Active-High Enable)	Individual channel enable: logic HIGH activates buffer; LOW forces output into high-Z state.
2, 5, 9, 12	A (Input)	Non-inverting data input per channel; Schmitt-triggered for noise margin.
3, 6, 8, 11	Y (Output)	3-state buffered output; drives HIGH/LOW or floats when corresponding OE = LOW.
7	GND	Ground reference for all logic and power domains; must be low-inductance connection.
14	V_CC	Positive supply rail; bypass capacitor (100 nF ceramic) required within 5 mm of pin.

Key Features

Feature	Design Value
TTL-compatible inputs	VIH = 2.0 V min, VIL = 0.8 V max - Interoperates directly with legacy 74LS and microcontroller GPIO without level shifting.
Independent 3-state control	Four separate OE pins - Enables selective channel isolation in multi-drop bus architectures without global disable.
Schmitt-trigger inputs	Hysteresis ≥ 0.4 V - Eliminates contact bounce or slow-edge issues in mechanical switch interfaces or long traces.
Low quiescent current	I_CC ≤ 40 µA at TA = −40°C to +125°C - Reduces system standby power in always-on embedded controllers.
Lead-free & green compliance	RoHS 2 (2011/65/EU), halogen-free (<900 ppm Br+Cl), antimony-free (<1000 ppm) - Meets IPC-1752A Tier 1 reporting and automotive PPAP requirements.

Applications

PC Peripheral Bus Isolation

Industrial I/O Expansion Module

Use Scenario: Isolating USB hub controller data lines from downstream port transceivers to prevent signal contention during hot-plug events.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer with per-port OE control, enabling dynamic bus segment enable/disable with sub-10 ns timing resolution.

Use Value: Prevents back-driving between upstream and downstream transceivers; eliminates need for discrete MOSFET switches or complex CPLD logic.

Use Scenario: Level-shifting and buffering GPIO signals from an ARM Cortex-M4 MCU to 24 V industrial solenoid drivers via optocouplers.

IC Role / Device Role / Timing Role: Input conditioning and fan-out buffer with Schmitt-triggered inputs to reject EMI-induced glitches on long cable runs.

Use Value: Improves noise immunity on 2 m field wiring; allows direct connection to 5 V logic without external RC filters or Schmitt buffers.

Legacy ISA Slot Interface

DVD-ROM Controller Data Path

Use Scenario: Driving address/data bus segments in retro-computing FPGA-based ISA expansion cards where strict 74-series timing and voltage levels are required.

IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74LS126 with identical pinout and tighter propagation delay spec (5.5 ns vs. 15 ns).

Use Value: Maintains full backward compatibility while reducing bus skew and supporting higher clock margins in FPGA glue logic.

Use Scenario: Buffering parallel ATA (PATA) data bus signals between DVD-ROM drive controller ASIC and host interface bridge IC.

IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control per byte lane to manage read/write direction switching.

Use Value: Enables clean bus turnaround with <8.5 ns disable time, eliminating hold-time violations during mode transitions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AHCT126DR (TI)	Identical logic function, SO-14 package, but t_PD max = 7.0 ns (CL = 50 pF) vs. 7.5 ns for Diodes part; slightly lower I_OH (−7.8 mA vs. −8 mA).	Valid for TI-centric BOMs; same thermal profile but requires revalidation of worst-case timing closure in high-capacitance buses.	Select if sourcing from TI-authorized channels or requiring TI's extended temp grade (-40°C to +125°C) with identical test conditions.
74VHC126M (ON Semiconductor)	Nominal V_CC range 2.0–5.5 V; lacks Schmitt-trigger inputs; I_OL/I_OH rated at ±8 mA only at V_CC = 4.5 V - weaker drive below 4.5 V.	Suitable for mixed-voltage systems (3.3 V/5 V), but unsuitable for noisy industrial environments due to missing hysteresis.	Choose only when operating below 4.5 V or integrating with 3.3 V logic; avoid in EMI-prone applications like motor control boards.

Compared with SN74AHCT126DR and 74VHC126M, the 74AHCT126S14-13 provides superior noise immunity via Schmitt inputs and guaranteed 8 mA drive across full 4.5–5.5 V range - critical for reliable bus arbitration in PC peripheral and optical storage designs.

Availability

74AHCT126S14-13 is available at Aetrix Electronics and suitable for PC peripheral bus isolation, industrial I/O expansion modules, and legacy ISA slot interface designs requiring stable component supply and long-term manufacturability.

Supply support for 74AHCT126S14-13 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 centers across Asia and manufacturing in China, Taiwan, and the Philippines.

The 74AHCT logic family targets industrial, computing, and consumer applications requiring TTL-compatible 5 V CMOS performance with enhanced noise immunity and robust ESD protection - optimized for reliability in high-volume board-level integration.

FAQ

Can 74AHCT126S14-13 operate reliably at 4.5 V minimum supply?

Yes. The device is fully characterized down to V_CC = 4.5 V across −40°C to +125°C, with guaranteed VOH ≥ 3.70 V and VOL ≤ 0.55 V at I_OL/I_OH = ±8 mA. All timing parameters, including t_PD and t_DIS, remain within datasheet limits at this voltage.

What is the maximum capacitive load the outputs can drive while maintaining timing specs?

The datasheet specifies switching characteristics up to CL = 50 pF. At this load, t_PD remains ≤ 7.5 ns and t_DIS ≤ 11.5 ns over temperature. For loads exceeding 50 pF, propagation and disable times increase linearly; layout best practice limits trace + stub capacitance to ≤ 45 pF for guaranteed timing compliance.

Is the SO-14 package of 74AHCT126S14-13 compatible with lead-free reflow profiles?

Yes. The SO-14 package is qualified for JEDEC J-STD-020D moisture sensitivity level 1 and supports peak reflow temperatures up to 260°C for 30 seconds. Its lead-free terminations meet SnAgCu (SAC305) alloy requirements and pass thermal cycling (−65°C to +150°C, 1000 cycles) without delamination.

How does the Schmitt-trigger input improve system-level noise immunity?

The Schmitt action provides ~0.5 V hysteresis between VIH and VIL thresholds, rejecting transient noise spikes ≤ 500 mV amplitude on input lines. This prevents metastability and false toggling in applications with long PCB traces, relay contacts, or unshielded cables - verified per IEC 61000-4-4 electrical fast transient testing.

74AHCT126S14-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: 74AHCT

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:: 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

74AHCT126S14-13 FAQ

1.How can I place an order for 74AHCT126S14-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AHCT126S14-13 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 74AHCT126S14-13 reliable?

The price and inventory of 74AHCT126S14-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT126S14-13 is usually 5 days.

3.What payment methods are accepted for 74AHCT126S14-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT126S14-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74AHCT126S14-13?

74AHCT126S14-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AHCT126S14-13 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 74AHCT126S14-13?

For technical support, including 74AHCT126S14-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT126S14-13 requirements.

6.How does Aetrix verify that 74AHCT126S14-13 is sourced from the original manufacturer or authorized distributors?

All 74AHCT126S14-13 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 74AHCT126S14-13 meets industry standards.

7.What is the process for return or replacement of 74AHCT126S14-13?

All 74AHCT126S14-13 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT126S14-13, 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 74AHCT126S14-13 part is unused and in its original packaging.

Return procedure for 74AHCT126S14-13:

1.Submit a request within 90 days.

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

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