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

NXP Semiconductors 74AHCT126PW,112

Name: 74AHCT126PW,112
Brand: NXP Semiconductors
SKU: 74AHCT126PW,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AHCT126PW,112

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74AHCT126PW,112.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74AHCT126PW,112 from Nexperia is a quad 3-state buffer/line driver with TTL-compatible inputs, operating from 4.5 V to 5.5 V supply, featuring 3.0 ns typical propagation delay at 5 V/15 pF, ±8 mA output drive, and overvoltage-tolerant inputs enabling mixed-voltage interfacing in industrial control backplanes.

For engineers reviewing the 74AHCT126PW,112 datasheet, 74AHCT126PW,112 pinout, 74AHCT126PW,112 application, or 74AHCT126PW,112 equivalent, key selection criteria include TTL-level input compatibility, 3-state enable timing (t_en = 4.7 ns typ), thermal performance in TSSOP14 (derates at 7.3 mW/K above 81 °C), and I/O voltage tolerance up to 5.5 V independent of V_CC.

Technical Context

This device implements four independent non-inverting buffers, each with an active-HIGH output enable (nOE) controlling high-impedance (Z) state on the corresponding nY output. Input Schmitt-trigger action provides noise immunity, while overvoltage tolerance allows safe interfacing between 3.3 V logic driving 5 V buses.

It operates across -40 °C to +125 °C with static VIH/VIL thresholds fixed at 2.0 V/0.8 V (TTL), ensuring robust level translation without external biasing. Dynamic behavior is characterized by matched t_PZH/t_PHZ and t_PLH/t_PLZ, supporting synchronous bus arbitration in multi-master systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL systems and margin for rail droop.
Propagation Delay	3.0 ns (typ) at V_CC = 5 V, C_L = 15 pF - Enables >150 MHz bus operation with tight timing budgets.
Output Drive	±8 mA - Sustains signal integrity across 50 Ω transmission lines or fan-out to ≥10 LS-TTL loads.
Input Voltage Range	-0.5 V to 5.5 V - Permits safe connection to higher-voltage nodes without clamping diodes or level shifters.
Operating Temperature	-40 °C to +125 °C - Qualified for under-hood industrial and extended-temperature embedded applications.
ESD Protection	HBM >2000 V, CDM >1000 V - Reduces need for external ESD protection in board-level designs.

Pinout & Package

TSSOP14 package (SOT402-1): 4.4 mm body width, 0.65 mm lead pitch, 14-terminal surface-mount outline optimized for high-density PCB layouts and thermal dissipation (P_tot derates 7.3 mW/K above 81 °C).

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	nOE (1–4)	Active-HIGH enable inputs - Asserting HIGH activates corresponding buffer; all LOW yields full bus isolation.
2, 5, 9, 12	nA (1–4)	Data inputs - TTL-compatible thresholds (VIH = 2.0 V, VIL = 0.8 V) ensure direct interface with legacy microcontrollers.
3, 6, 8, 11	nY (1–4)	3-state outputs - High-impedance OFF-state eliminates bus contention during shared-data transfers.
7	GND	Reference ground - Must be low-inductance connection to minimize switching noise coupling into logic outputs.
14	V_CC	Power supply - Decoupling capacitor (100 nF ceramic) required within 5 mm for stable 5 V operation.

Key Features

Feature	Design Value
TTL-level input compatibility	VIH = 2.0 V, VIL = 0.8 V - Eliminates need for external level-shifting circuitry when interfacing with 5 V microcontrollers.
Overvoltage-tolerant inputs	Accepts -0.5 V to 5.5 V regardless of V_CC - Enables safe hot-plug operation and mixed-supply domain bridging.
Balanced propagation delays	t_PLH = t_PHL = 3.0 ns (typ) - Prevents duty-cycle distortion in clock distribution or data strobe paths.
Thermal-enhanced TSSOP	Derating slope 7.3 mW/K above 81 °C - Supports sustained operation in compact enclosures without forced air cooling.
Schmitt-trigger inputs	Hysteresis >0.3 V - Rejects <10 ns noise spikes on long traces or noisy industrial environments.

Applications

Industrial PLC Backplane

Legacy Microcontroller Bus Interface

Use Scenario: Isolating and buffering address/data lines between CPU module and I/O expansion slots in modular programmable logic controllers.

IC Role / Device Role / Timing Role: Quad 3-state buffer providing bidirectional bus separation, controlled by slot-select enable signals to prevent contention.

Use Value: ±8 mA drive sustains signal integrity over 15 cm backplane traces; 3.0 ns delay ensures setup/hold compliance at 25 MHz bus clock.

Use Scenario: Level-translating and driving parallel control signals from a 3.3 V ARM Cortex-M3 to 5 V peripheral ICs (ADCs, DACs, motor drivers).

IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating TTL logic levels while maintaining timing alignment across multiple control lines.

Use Value: Input overvoltage tolerance eliminates external resistive dividers; matched t_PZH/t_PHZ prevents skew-induced metastability in enable-controlled peripherals.

Test Equipment Signal Routing

Automated Test Fixture Control

Use Scenario: Multiplexing DUT stimulus signals in automated test equipment where multiple instruments share a common signal path.

IC Role / Device Role / Timing Role: 3-state line driver enabling dynamic reconfiguration of signal routing under microcontroller command.

Use Value: 4.7 ns enable time supports sub-100 ns channel switching; high-impedance OFF-state isolates unused paths to reduce crosstalk below -40 dB.

Use Scenario: Driving relay coils and optocoupler inputs in production-line test fixtures requiring precise sequencing of power-up and measurement phases.

IC Role / Device Role / Timing Role: Robust buffer delivering clean, slew-controlled logic edges to discrete power switches despite inductive load transients.

Use Value: Schmitt-trigger inputs reject noise from relay coil flyback; 5.5 V input rating withstands transient overshoot during hot-swap events.

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
SN74LVC126APWR	CMOS input thresholds (VIH = 2.0 V @ V_CC = 3.3 V), 3.3 V only supply, lower drive (±24 mA), faster delay (2.5 ns).	Requires level-shifting for 5 V systems; suited for modern low-voltage FPGA/CPU interfaces.	Select when interfacing with 3.3 V logic and space-constrained PCBs; avoid in mixed 5 V/3.3 V domains without translators.
74HC126PW,118	CMOS input thresholds (VIH = 3.85 V @ V_CC = 5 V), wider V_CC range (2–6 V), slower delay (8 ns @ 5 V), same TSSOP14 package.	Not TTL-compatible - fails to recognize standard 5 V TTL outputs as HIGH without pull-ups.	Choose for cost-sensitive 5 V-only designs where timing slack exists; unsuitable for legacy TTL source interfacing.

Compared with SN74LVC126APWR and 74HC126PW,118, the 74AHCT126PW,112 uniquely delivers guaranteed TTL input recognition at 5 V while maintaining backward compatibility with older industrial hardware - a distinction critical for field-replaceable modules in deployed systems.

Availability

74AHCT126PW,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microcontroller bus interfaces, automated test fixture control, and signal routing applications requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT126PW,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 delivering high-performance, reliable logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AHCT series targets industrial and legacy-system interfacing, emphasizing TTL compatibility, wide temperature operation, and robustness in electrically noisy environments.

FAQ

Is 74AHCT126PW,112 pin-compatible with 74HC126PW?

Yes - both use identical TSSOP14 (SOT402-1) pinout and terminal numbering. However, 74AHCT126PW,112 accepts TTL input levels (VIH = 2.0 V), while 74HC126PW requires CMOS levels (VIH ≈ 3.85 V at 5 V). Swapping them may cause logic misreads if driven by standard TTL sources.

What is the maximum capacitive load this device can drive reliably?

The datasheet specifies timing parameters up to 50 pF load capacitance. At 15 pF, propagation delay is 3.0 ns (typ); at 50 pF, it rises to 4.3 ns (typ). For loads exceeding 50 pF, add series termination or reduce edge rate via input RC filtering to maintain signal integrity.

Can 74AHCT126PW,112 operate with V_CC = 3.3 V?

No - the 74AHCT variant is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds fall outside TTL specification (VIH min = 2.0 V becomes marginal), and output drive degrades significantly. Use 74AHC126PW instead for 3.3 V systems.

Does the TSSOP14 package require thermal pad soldering?

No - the SOT402-1 package has no exposed thermal pad. Thermal performance relies on copper pour under pins 7 (GND) and 14 (V_CC). A minimum 25 mm² GND plane area adjacent to the device is recommended to sustain full 125 °C operation.

74AHCT126PW,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74AHCT

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

74AHCT126PW,112 FAQ

1.How can I place an order for 74AHCT126PW,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AHCT126PW,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 74AHCT126PW,112 reliable?

The price and inventory of 74AHCT126PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT126PW,112 is usually 5 days.

3.What payment methods are accepted for 74AHCT126PW,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT126PW,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74AHCT126PW,112?

74AHCT126PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AHCT126PW,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 74AHCT126PW,112?

For technical support, including 74AHCT126PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT126PW,112 requirements.

6.How does Aetrix verify that 74AHCT126PW,112 is sourced from the original manufacturer or authorized distributors?

All 74AHCT126PW,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 74AHCT126PW,112 meets industry standards.

7.What is the process for return or replacement of 74AHCT126PW,112?

All 74AHCT126PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT126PW,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 74AHCT126PW,112 part is unused and in its original packaging.

Return procedure for 74AHCT126PW,112:

1.Submit a request within 90 days.

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

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