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

Diodes Incorporated 74HCT126T14-13

Name: 74HCT126T14-13
Brand: Diodes Incorporated
SKU: 74HCT126T14-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HCT126T14-13

Manufacturer:: Diodes Incorporated

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74HCT126T14-13.pdf

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

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Product details

Overview

74HCT126T14-13 from Diodes Incorporated is a quadruple 3-state buffer IC with independent active-high enable inputs, designed for bidirectional bus interface and signal isolation in 4.5V–5.5V 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 - used in PC motherboard I/O buffering and peripheral data routing.

For engineers reviewing the 74HCT126T14-13 datasheet, 74HCT126T14-13 pinout, 74HCT126T14-13 application, or 74HCT126T14-13 equivalent, key selection criteria include active-high enable logic, TTL-compatible input thresholds, 3-state leakage < ±10 µA, propagation delay ≤38 ns (–40°C to +125°C), and TSSOP-14 thermal performance under sustained 4mA load conditions.

Technical Context

The 74HCT126T14-13 implements four identical non-inverting buffer channels, each with dedicated OE (active-high) control enabling independent high-impedance state entry. Its CMOS HCT process ensures TTL-level input compatibility while maintaining low static current (I_CC ≤ 40 µA) and ESD robustness (2 kV HBM).

All inputs incorporate Schmitt-trigger action with hysteresis ≥0.3V, supporting clean signal recovery from slow-rising or noisy sources. Output switching is characterized with CL = 50 pF, specifying t_PD, t_EN, and t_DIS up to 42 ns over full industrial temperature range.

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 against supply droop.
I_OH/I_OL	±4mA at V_CC = 4.5V - sufficient to drive one LSTTL load or multiple CMOS inputs without external buffering.
t_PD Max	38 ns (–40°C to +125°C) - defines worst-case timing margin for synchronous bus handshaking at ≤10 MHz.
V_IH/V_IL	2.0V / 0.8V - matches legacy TTL voltage thresholds, enabling direct interfacing with 74LS and 74F families.
I_OZ Max	±10 µA at V_O = 0–5.5V - guarantees minimal leakage during 3-state hold, critical for multi-drop bus contention avoidance.
C_pd	24 pF per gate - determines dynamic power consumption (P_dyn ≈ C_pd × V_CC² × f) at 1 MHz operation.

Pinout & Package

TSSOP-14 package: 4.9 mm × 4.4 mm body, 0.65 mm pitch, exposed pad optional, JEDEC MO-153 compliant. RoHS-compliant, halogen-free, lead-free construction.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	OE (Active-High Enable)	Asserting high enables corresponding Y output; low forces high-impedance - enables per-channel bus arbitration.
2, 5, 9, 12	A (Input)	Non-inverting data input with Schmitt-trigger hysteresis - rejects noise on slow edges or unterminated lines.
3, 6, 8, 11	Y (Output)	3-state buffered output; driven high/low when OE = H, high-Z when OE = L - prevents bus contention.
7	GND	Reference ground for all logic and I/O - must be low-inductance connection to minimize switching noise coupling.
14	V_CC	Positive supply rail - requires local 100 nF ceramic decoupling within 5 mm of pin for stable transient response.

Key Features

Feature	Design Value
Schmitt-trigger inputs	Hysteresis ≥0.3V ensures reliable switching on noisy or slowly transitioning signals (e.g., mechanical switch debouncing).
4mA output drive	Supports fan-out of 10 LSTTL loads or >20 CMOS inputs at 5V, eliminating need for external drivers in mid-density logic.
ESD protection	2 kV HBM, 1 kV CDM, 200 V MM - exceeds JEDEC standards, reducing board-level ESD hardening requirements.
Industrial temp range	–40°C to +125°C operating junction temperature - validated for use in enclosed industrial controllers and automotive infotainment ECUs.

Applications

PC Motherboard I/O Buffering

USB Hub Signal Isolation

Use Scenario: Isolating legacy parallel port or PS/2 keyboard/mouse signals from main CPU bus to prevent loading and contention.

IC Role / Device Role / Timing Role: Bidirectional 3-state buffer managing signal direction and bus release timing under software-controlled OE.

Use Value: Enables hot-plug-safe peripheral attachment via controlled high-Z transitions, with ≤38 ns disable time preventing glitch propagation.

Use Scenario: Separating upstream USB 2.0 D+/D– lines between hub controller and downstream ports during suspend/resume cycles.

IC Role / Device Role / Timing Role: Unidirectional buffer isolating control signaling paths; OE synchronized to USB suspend state machine.

Use Value: Prevents back-drive current from powered-down downstream devices, leveraging < ±10 µA 3-state leakage for ultra-low standby current.

Network Interface Card (NIC) LED Control

Industrial PLC Digital I/O Expansion

Use Scenario: Driving status LEDs (Link/Activity) from low-drive-capability MAC controller GPIO pins.

IC Role / Device Role / Timing Role: Non-inverting buffer amplifying weak GPIO outputs; OE tied high for always-on operation.

Use Value: Delivers 4mA sink/source per channel - sufficient for standard 2mA LEDs without series resistor recalculations.

Use Scenario: Expanding isolated digital input channels in modular PLC backplanes using shared data bus architecture.

IC Role / Device Role / Timing Role: Bus transceiver buffer enabling readback of field sensor states via multiplexed address/data lines.

Use Value: Schmitt-trigger inputs tolerate long cable runs with induced noise; 125°C rating supports operation inside sealed control cabinets.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT126PW	TSSOP-14, same logic function and DC specs; propagation delay 35 ns max (–40°C to +85°C), not rated to +125°C.	Limited to commercial/industrial ambient (≤85°C); unsuitable for under-hood or enclosed thermal environments.	Select if operating temperature stays below 85°C and TI's qualification documentation is required.
74VHC126FT	Same pinout, but V_CC = 2–5.5V; lower drive (±8mA @ 5V), higher speed (t_PD = 10.5 ns typ), no Schmitt inputs.	Requires clean, fast-rising inputs; incompatible with slow/noisy sources like mechanical switches or long traces.	Choose for high-speed, low-voltage mixed-supply systems where input conditioning is already handled externally.

Compared with SN74HCT126PW and 74VHC126FT, the 74HCT126T14-13 uniquely combines Schmitt-trigger noise immunity, full industrial temperature support, and guaranteed 4mA drive at 4.5V - making it optimal for ruggedized embedded interfaces where signal integrity and thermal margin are non-negotiable.

Availability

74HCT126T14-13 is available at Aetrix Electronics and suitable for PC motherboard I/O buffering, USB hub signal isolation, and industrial PLC digital I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT126T14-13 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 74HCT126 belongs to Diodes' HCT logic family - engineered for TTL-compatible interoperability, low-power CMOS efficiency, and robust operation in thermally demanding embedded systems.

FAQ

Can 74HCT126T14-13 operate reliably at 4.5V with full 4mA output drive?

Yes. Electrical Characteristics tables confirm I_OL = 4.0 mA and I_OH = –4.0 mA are guaranteed at V_CC = 4.5V across –40°C to +125°C, with VOL ≤ 0.4 V and VOH ≥ 3.70 V under those conditions - meeting LSTTL load requirements without derating.

Is the TSSOP-14 package of 74HCT126T14-13 compatible with SO-14 footprints?

No. TSSOP-14 has 0.65 mm lead pitch and 4.4 mm width versus SO-14's 1.27 mm pitch and 3.9 mm width. Pad layout, stencil design, and reflow profile differ significantly - mechanical adaptation requires PCB redesign, not drop-in replacement.

What is the maximum capacitive load the 74HCT126T14-13 can drive while maintaining specified timing?

Switching characteristics are characterized at C_L = 50 pF. While operation with higher loads (e.g., 100 pF) is possible, t_PD, t_EN, and t_DIS increase linearly with load capacitance - exceeding 50 pF may violate setup/hold margins in 10+ MHz synchronous buses without timing recalculations.

Does 74HCT126T14-13 require external pull-up or pull-down resistors on unused inputs?

Yes. Per Recommended Operating Conditions, unused inputs must be tied to V_CC or GND to prevent floating nodes, which could cause increased ICC, erratic output behavior, or localized heating due to partial conduction in the input stage.

74HCT126T14-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: 74HCT

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:: 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-TSSOP

74HCT126T14-13 FAQ

1.How can I place an order for 74HCT126T14-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HCT126T14-13 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 74HCT126T14-13 reliable?

The price and inventory of 74HCT126T14-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT126T14-13 is usually 5 days.

3.What payment methods are accepted for 74HCT126T14-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT126T14-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HCT126T14-13?

74HCT126T14-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HCT126T14-13 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 74HCT126T14-13?

For technical support, including 74HCT126T14-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT126T14-13 requirements.

6.How does Aetrix verify that 74HCT126T14-13 is sourced from the original manufacturer or authorized distributors?

All 74HCT126T14-13 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 74HCT126T14-13 meets industry standards.

7.What is the process for return or replacement of 74HCT126T14-13?

All 74HCT126T14-13 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT126T14-13, 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 74HCT126T14-13 part is unused and in its original packaging.

Return procedure for 74HCT126T14-13:

1.Submit a request within 90 days.

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

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