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

NXP Semiconductors 74HCT2G126DP,125

Name: 74HCT2G126DP,125
Brand: NXP Semiconductors
SKU: 74HCT2G126DP,125
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HCT2G126DP,125

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: 74HCT2G126DP,125.pdf

Description:: IC BUF NON-INVERT 5.5V 8TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74HCT2G126DP,125 from NXP Semiconductors is a dual 3-state buffer/line driver with TTL-compatible inputs, operating from 4.5 V to 5.5 V, delivering ±6 mA output drive at V_CC = 4.5 V, and specified for −40 °C to +125 °C industrial temperature range - used in bidirectional bus interfacing and level translation between legacy TTL logic and modern CMOS systems.

For engineers reviewing the 74HCT2G126DP,125 datasheet, 74HCT2G126DP,125 pinout, 74HCT2G126DP,125 application, or 74HCT2G126DP,125 equivalent, key selection criteria include its TTL-level input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), symmetrical propagation delay (15–36 ns @ 4.5 V), 3-state enable timing (enable/disable < 38 ns), and TSSOP8 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent non-inverting buffers, each with separate 3-state output enable (nOE) control. Each channel accepts TTL-level inputs and drives CMOS-compatible outputs with rail-to-rail swing and symmetrical output impedance.

It features integrated input clamp diodes enabling safe interface to voltages exceeding V_CC when used with current-limiting resistors, and meets JEDEC Std 7A for commercial and industrial logic interoperability. ESD protection exceeds 2000 V HBM and 200 V MM.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and mixed-voltage systems without level shifters
Input Thresholds (TTL)	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - guarantees reliable recognition of legacy TTL logic levels
Output Drive Capability	±6.0 mA @ V_CC = 4.5 V - sufficient to drive multiple 74-series loads or 50 pF traces
Propagation Delay	15–36 ns (t_PD) @ V_CC = 4.5 V - supports data rates up to ~20 MHz in buffered bus applications
3-State Enable/Disable Time	t_EN ≤ 38 ns, t_DIS ≤ 42 ns @ V_CC = 4.5 V - enables fast bus arbitration and multiplexed signal routing
Operating Temperature	−40 °C to +125 °C - qualified for under-hood automotive modules and industrial controllers
ESD Protection	HBM > 2000 V, MM > 200 V - reduces need for external transient suppression in board-level ESD zones

Pinout & Package

TSSOP8 package (SOT505-2): plastic thin shrink small outline, 8-lead, 3 mm body width, 0.65 mm pitch, 0.5 mm lead length, pin 1 indicator at lower-left corner.

Pin/Terminal	Circuit Role	Design Meaning
1, 7	nOE (Output Enable)	Active-low control per buffer - drives output to high-impedance Z-state when HIGH
2, 5	nA (Data Input)	Non-inverting TTL-level input - accepts 0.8 V/2.0 V thresholds, clamped for overvoltage tolerance
3, 6	nY (Data Output)	CMOS-compatible buffered output - rail-to-rail swing, ±6 mA drive, low output capacitance (1.5 pF)
4	GND	Signal and power reference ground - decoupling capacitor placement critical for noise immunity
8	V_CC	Positive supply - requires local 100 nF ceramic decoupling adjacent to pin 8

Key Features

Feature	Design Value
TTL-compatible inputs	Enables direct connection to 74LS, 74F, and microcontroller GPIOs without level-shifting circuitry
Symmetrical output impedance	Ensures matched rise/fall times (<15 ns transition time @ 4.5 V), minimizing signal distortion on shared buses
Input clamp diodes	Allows safe interface to signals up to V_CC + 0.5 V using series current-limiting resistors
Low quiescent supply current	ICC ≤ 20 µA @ V_CC = 5.5 V - supports low-power standby modes in battery-backed systems
JEDEC Std 7A compliance	Guarantees interoperability with industry-standard 74-series logic families across voltage and timing margins

Applications

Industrial Bus Interface	Microcontroller I/O Expansion
Use Scenario: Isolating and buffering address/data lines between an MCU and multiple peripheral ICs on a shared parallel bus. IC Role / Device Role / Timing Role: Dual 3-state buffer providing direction-controlled signal isolation and fanout amplification. Use Value: Enables clean bus arbitration with sub-40 ns enable/disable timing and eliminates contention-induced glitches during state transitions.	Use Scenario: Extending GPIO count of an ARM Cortex-M0+ MCU by driving off-chip peripherals via a 16-bit parallel interface. IC Role / Device Role / Timing Role: Level-translating buffer converting MCU's 3.3 V tolerant pins to 5 V-tolerant outputs for legacy peripherals. Use Value: TTL input thresholds allow direct connection to 3.3 V outputs; 5 V supply enables robust 5 V peripheral drive without external translators.
Automotive Sensor Hub	Test Equipment Signal Conditioning
Use Scenario: Aggregating digital status signals from multiple CAN/LIN transceivers and feeding them to a central diagnostic controller. IC Role / Device Role / Timing Role: Industrial-temperature buffer isolating noisy sensor domain signals from sensitive control logic. Use Value: −40 °C to +125 °C rating and 2000 V HBM ESD withstand ensure reliability in engine bay environments without derating.	Use Scenario: Driving calibrated test signals into DUT inputs while maintaining precise edge integrity and load independence. IC Role / Device Role / Timing Role: Low-capacitance (1.5 pF), fast-transition buffer preserving signal fidelity in automated test fixtures. Use Value: 5 ns typical transition time and symmetrical output impedance minimize jitter and overshoot on 50 Ω transmission lines.

Industrial Bus Interface

Microcontroller I/O Expansion

Use Scenario: Isolating and buffering address/data lines between an MCU and multiple peripheral ICs on a shared parallel bus.

IC Role / Device Role / Timing Role: Dual 3-state buffer providing direction-controlled signal isolation and fanout amplification.

Use Value: Enables clean bus arbitration with sub-40 ns enable/disable timing and eliminates contention-induced glitches during state transitions.

Use Scenario: Extending GPIO count of an ARM Cortex-M0+ MCU by driving off-chip peripherals via a 16-bit parallel interface.

IC Role / Device Role / Timing Role: Level-translating buffer converting MCU's 3.3 V tolerant pins to 5 V-tolerant outputs for legacy peripherals.

Use Value: TTL input thresholds allow direct connection to 3.3 V outputs; 5 V supply enables robust 5 V peripheral drive without external translators.

Automotive Sensor Hub

Test Equipment Signal Conditioning

Use Scenario: Aggregating digital status signals from multiple CAN/LIN transceivers and feeding them to a central diagnostic controller.

IC Role / Device Role / Timing Role: Industrial-temperature buffer isolating noisy sensor domain signals from sensitive control logic.

Use Value: −40 °C to +125 °C rating and 2000 V HBM ESD withstand ensure reliability in engine bay environments without derating.

Use Scenario: Driving calibrated test signals into DUT inputs while maintaining precise edge integrity and load independence.

IC Role / Device Role / Timing Role: Low-capacitance (1.5 pF), fast-transition buffer preserving signal fidelity in automated test fixtures.

Use Value: 5 ns typical transition time and symmetrical output impedance minimize jitter and overshoot on 50 Ω transmission lines.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC2G126DBVR	Lower V_CC range (1.65–5.5 V); CMOS inputs only; 32 mA drive; smaller X2SON8 package	Better suited for 1.8 V/3.3 V systems; not TTL-compatible - requires level shifting for 5 V inputs	Select when interfacing with low-voltage FPGAs or SoCs; avoid if legacy TTL signals are present
74AHC2G126DP,125	Wider V_CC range (2.0–5.5 V); CMOS inputs; higher speed (t_PD = 8–20 ns @ 5 V); same TSSOP8 footprint	Superior for high-speed 3.3 V designs; lacks TTL input compatibility - cannot directly replace 74HCT2G126DP,125 in 5 V TTL systems	Choose for new 3.3 V designs requiring faster timing; retain 74HCT2G126DP,125 where TTL input recognition is mandatory

Compared with SN74LVC2G126DBVR and 74AHC2G126DP,125, the 74HCT2G126DP,125 uniquely provides guaranteed TTL input compatibility at 5 V while maintaining industrial temperature range and TSSOP8 footprint - making it irreplaceable in mixed-logic upgrades and legacy system refurbishment.

Availability

74HCT2G126DP,125 is available at Aetrix Electronics and suitable for industrial bus interface, microcontroller I/O expansion, automotive sensor hub, and test equipment signal conditioning requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for 74HCT2G126DP,125 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74HCT2G126DP,125 belongs to NXP's 74HCT logic family, designed specifically to bridge legacy TTL systems with modern CMOS architectures while maintaining industrial-grade reliability and thermal performance.

FAQ

What logic family does the 74HCT2G126DP,125 belong to, and why does that matter?

The 74HCT2G126DP,125 belongs to the 74HCT (High-speed CMOS with TTL input thresholds) family. This means it accepts standard TTL voltage levels (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) while delivering CMOS output characteristics - enabling seamless integration between older TTL devices and newer 5 V CMOS systems without level shifters. Its design eliminates input threshold mismatch issues common when mixing logic families.

Can the 74HCT2G126DP,125 operate at 3.3 V supply?

No - the 74HCT2G126DP,125 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions table. At 3.3 V, input thresholds fall outside guaranteed recognition range (V_IH min = 2.0 V requires ≥4.5 V V_CC for margin), and output drive degrades significantly. For 3.3 V systems, consider SN74LVC2G126DBVR or 74AHC2G126DP,125 instead.

What is the maximum capacitive load the 74HCT2G126DP,125 can drive reliably?

The 74HCT2G126DP,125 is characterized with CL = 50 pF in dynamic testing and maintains specified propagation delay (≤36 ns) and transition time (≤18 ns) under that load. Its 1.5 pF output capacitance and ±6 mA drive capability support stable operation into typical PCB traces and multiple 74-series inputs. For loads >100 pF, verify timing margins using the actual layout and termination.

Does the 74HCT2G126DP,125 require external pull-up or pull-down resistors on its 3-state outputs?

No - the 74HCT2G126DP,125 outputs enter true high-impedance (Z) state when nOE is HIGH, with OFF-state leakage ≤±10 µA. External resistors are unnecessary unless system-level bus hold or fail-safe biasing is required. Adding pull-ups may increase power consumption and degrade disable timing due to RC loading.

How does the 74HCT2G126DP,125 handle input voltages exceeding V_CC?

The 74HCT2G126DP,125 integrates input clamp diodes to GND and V_CC, allowing safe interface to signals up to V_CC + 0.5 V when used with external current-limiting resistors (per Absolute Maximum Ratings). This protects internal circuitry from overvoltage damage and enables direct connection to hot-swap or mixed-supply nodes without additional protection components.

74HCT2G126DP,125 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74HCT

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 1

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 6mA, 6mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

74HCT2G126DP,125 FAQ

1.How can I place an order for 74HCT2G126DP,125 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HCT2G126DP,125 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 74HCT2G126DP,125 reliable?

The price and inventory of 74HCT2G126DP,125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT2G126DP,125 is usually 5 days.

3.What payment methods are accepted for 74HCT2G126DP,125?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT2G126DP,125 transactions.

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4.How is shipping managed for 74HCT2G126DP,125?

74HCT2G126DP,125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HCT2G126DP,125 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 74HCT2G126DP,125?

For technical support, including 74HCT2G126DP,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT2G126DP,125 requirements.

6.How does Aetrix verify that 74HCT2G126DP,125 is sourced from the original manufacturer or authorized distributors?

All 74HCT2G126DP,125 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 74HCT2G126DP,125 meets industry standards.

7.What is the process for return or replacement of 74HCT2G126DP,125?

All 74HCT2G126DP,125 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT2G126DP,125, 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 74HCT2G126DP,125 part is unused and in its original packaging.

Return procedure for 74HCT2G126DP,125:

1.Submit a request within 90 days.

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

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