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

NXP Semiconductors N74F126D,623

Name: N74F126D,623
Brand: NXP Semiconductors
SKU: N74F126D,623
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: N74F126D,623

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: N74F126D,623.pdf

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

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Product details

Overview

N74F126D,623 from Philips Semiconductors is a quad 3-state buffer with active-high output enable, designed for bus interface and data routing in TTL-compatible digital systems. It delivers 5.0 ns typical propagation delay, ±15 mA high-level and 64 mA low-level output drive, and operates at 5.0 V ±10% over 0°C to +70°C. It is used in address/data bus isolation in industrial control backplanes.

For engineers reviewing the N74F126D,623 datasheet, N74F126D,623 pinout, N74F126D,623 application, or N74F126D,623 equivalent, key selection criteria include active-high OE logic, SO14 package compatibility, 3-state output timing (tPZH/tPHZ ≤ 8.5 ns), and DC drive capability matching legacy 74F bus loads.

Technical Context

The N74F126D,623 implements four independent non-inverting buffers, each with a dedicated active-high output enable (OE_n) controlling high-impedance state on its corresponding Q_n output. All inputs feature high-impedance NPN base structures limiting input current to ±20 µA in both logic states.

It complies with IEC/IEEE standard logic symbols for 3-state buffers and uses standard 74F voltage thresholds: V_IL = 0.8 V max, V_IH = 2.0 V min. Output drive meets 74F family fan-out requirements-750/106.7 FAST unit loads (15 mA/64 mA) for HIGH/LOW states respectively.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Quad non-inverting 3-state buffer with active-high OE
Propagation Delay (D→Q)	5.0 ns typical at VCC = 5 V, CL = 50 pF - ensures sub-10 ns timing in synchronous bus cycles
Output Drive	–15 mA (IOH), +64 mA (IOL) - supports direct connection to 74F/74AS loads without external buffering
Supply Voltage Range	4.5 V to 5.5 V - compatible with standard 5 V TTL power rails and tolerates ±10% regulation variation
Operating Temperature	0°C to +70°C - certified for commercial-grade embedded control and instrumentation applications
Input Current	±20 µA max - minimizes loading on upstream drivers and preserves signal integrity across long traces
Off-State Leakage	±50 µA max (IOZH/IOZL) - prevents unintended bus contention during tri-state transitions

Pinout & Package

Package: SO14 (plastic small outline, 14-lead, 3.9 mm body width, SOT108-1).

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	OE₀–OE₃ (active-high)	Enable control for Q₀–Q₃; LOW = high-impedance output, HIGH = pass-through D_n
2, 5, 9, 12	D₀–D₃	Data inputs; non-inverting path to respective outputs when OE_n = HIGH
3, 6, 8, 11	Q₀–Q₃	3-state buffered outputs; driven HIGH/LOW or placed in high-Z per OE_n state
7	GND	Ground reference for all logic and output stages
14	V_CC	+5 V supply for internal logic and output drivers

Key Features

Feature	Design Value
Active-high output enable	Eliminates need for external inverters when interfacing with microcontroller GPIOs that assert enables directly
High-impedance NPN base inputs	Reduces input loading to ±20 µA - critical for maintaining fan-out margin in multi-drop bus topologies
Matched 3-state timing	tPZH/tPHZ ≤ 8.5 ns and tPLZ/tPZL ≤ 8.0 ns - ensures clean, overlap-free bus turnarounds in bidirectional data paths
74F-compatible DC specs	V_OH ≥ 2.7 V (IOH = –3 mA), V_OL ≤ 0.55 V (IOL = 64 mA) - guarantees interoperability with legacy 74F/74AS logic families

Applications

Industrial Backplane Bus Isolation	Microcontroller Peripheral Interface
Use Scenario: Isolating address/data lines between CPU and multiple peripheral cards in a modular PLC rack. IC Role / Device Role / Timing Role: Quad buffer provides direction-controlled, contention-free bus access; active-high OE allows direct mapping to CPLD decode signals. Use Value: Enables hot-swap-safe peripheral insertion by placing unused bus segments in high-Z, preventing signal collisions during card reconfiguration.	Use Scenario: Interfacing an 8-bit microcontroller's port pins to external memory-mapped peripherals with shared address/data lines. IC Role / Device Role / Timing Role: Buffers expand drive strength and isolate MCU pins from capacitive bus loads; 5 ns propagation supports 20 MHz bus clocking. Use Value: Prevents port pin voltage droop and timing skew under load, ensuring reliable read/write strobe alignment across multiple devices.
Legacy System Logic Translation	Test Equipment Signal Gating
Use Scenario: Bridging 74F logic domains to newer 3.3 V FPGA I/O banks using level-shifting resistors and pull-ups. IC Role / Device Role / Timing Role: Acts as a robust 5 V-tolerant buffer stage; high-impedance outputs prevent back-driving during FPGA configuration. Use Value: Maintains signal integrity and noise margin while enabling mixed-voltage system integration without custom level shifters.	Use Scenario: Enabling/disabling analog-to-digital converter sample clocks or trigger signals in automated test fixtures. IC Role / Device Role / Timing Role: Provides precise, low-jitter gating of timing-critical signals via synchronized OE control from test sequencer. Use Value: Achieves sub-10 ns enable/disable edges - essential for deterministic sampling window control and jitter-sensitive measurements.

Industrial Backplane Bus Isolation

Microcontroller Peripheral Interface

Use Scenario: Isolating address/data lines between CPU and multiple peripheral cards in a modular PLC rack.

IC Role / Device Role / Timing Role: Quad buffer provides direction-controlled, contention-free bus access; active-high OE allows direct mapping to CPLD decode signals.

Use Value: Enables hot-swap-safe peripheral insertion by placing unused bus segments in high-Z, preventing signal collisions during card reconfiguration.

Use Scenario: Interfacing an 8-bit microcontroller's port pins to external memory-mapped peripherals with shared address/data lines.

IC Role / Device Role / Timing Role: Buffers expand drive strength and isolate MCU pins from capacitive bus loads; 5 ns propagation supports 20 MHz bus clocking.

Use Value: Prevents port pin voltage droop and timing skew under load, ensuring reliable read/write strobe alignment across multiple devices.

Legacy System Logic Translation

Test Equipment Signal Gating

Use Scenario: Bridging 74F logic domains to newer 3.3 V FPGA I/O banks using level-shifting resistors and pull-ups.

IC Role / Device Role / Timing Role: Acts as a robust 5 V-tolerant buffer stage; high-impedance outputs prevent back-driving during FPGA configuration.

Use Value: Maintains signal integrity and noise margin while enabling mixed-voltage system integration without custom level shifters.

Use Scenario: Enabling/disabling analog-to-digital converter sample clocks or trigger signals in automated test fixtures.

IC Role / Device Role / Timing Role: Provides precise, low-jitter gating of timing-critical signals via synchronized OE control from test sequencer.

Use Value: Achieves sub-10 ns enable/disable edges - essential for deterministic sampling window control and jitter-sensitive measurements.

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
SN74F126N	DIP14 package (SOT27-1); identical AC/DC specs and pinout	Through-hole mounting required; less suitable for high-density PCBs	Select when legacy through-hole assembly or socket-based prototyping is needed
74ACT126M	Advanced CMOS (ACT) family; 5 V tolerant, lower ICC (4 mA typ), faster tPLH/tPHL (3.5 ns typ)	Higher noise immunity (VIL = 1.0 V, VIH = 3.5 V); not 74F-current-compatible	Select when lower power and improved noise margin are prioritized over strict 74F drive matching

Compared with SN74F126N and 74ACT126M, the N74F126D,623 offers SO14 surface-mount compatibility with verified 74F bus drive strength and timing - making it optimal for space-constrained industrial boards requiring drop-in replacement of legacy 74F designs.

Availability

N74F126D,623 is available at Aetrix Electronics and suitable for industrial backplane bus isolation, microcontroller peripheral interface, and legacy system logic translation requiring stable component supply and long-term obsolescence management.

Supply support for N74F126D,623 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

Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator with leadership in logic, analog, and automotive ICs since the 1950s.

The 74F logic family was engineered for high-speed TTL-compatible operation in industrial and computing systems, emphasizing speed-power balance and robust bus-driving capability - precisely the role fulfilled by the N74F126D,623.

FAQ

What is the logic polarity of the output enable inputs on the N74F126D,623?

The N74F126D,623 features active-high output enable inputs (OE₀–OE₃). When OE_n = HIGH, the corresponding Q_n output follows the D_n input; when OE_n = LOW, Q_n enters high-impedance state. This differs from the N74F125D, which uses active-low enables. The N74F126D,623 datasheet confirms this behavior in its function table and logic diagrams.

Does the N74F126D,623 support 3.3 V logic inputs?

No - the N74F126D,623 is a 5 V-only device with TTL-compatible input thresholds: V_IL ≤ 0.8 V and V_IH ≥ 2.0 V. While 3.3 V logic HIGH may meet V_IH, marginal noise margins and undefined behavior below V_IH make direct 3.3 V interfacing unreliable. Level translation is recommended. The N74F126D,623 specification explicitly defines operation only within 4.5–5.5 V V_CC.

What is the maximum continuous output current rating for the N74F126D,623?

The N74F126D,623 specifies I_OL = +64 mA (low-state) and I_OH = –15 mA (high-state) under recommended operating conditions. Absolute maximum ratings limit single-output short-circuit current to –225 mA, but sustained operation above I_OL/I_OH values risks thermal overstress. These limits are confirmed in the DC Electrical Characteristics table of the N74F126D,623 datasheet.

Is the N74F126D,623 pin-compatible with the N74F125D?

Yes - the N74F126D,623 and N74F125D share identical pin configurations (SO14), terminal assignments, and physical layout. Only the OE logic polarity differs: N74F125D uses active-low enables, while N74F126D,623 uses active-high. No PCB change is needed for substitution, but firmware or logic design must invert OE control signals when replacing one with the other.

What package type does the N74F126D,623 use and what are its key mechanical dimensions?

The N74F126D,623 uses the SO14 plastic small outline package (SOT108-1), with 14 leads, 3.9 mm body width, and 1.27 mm lead pitch. Its JEDEC MS-012AC footprint is standardized for surface-mount reflow assembly. This package is documented in the Philips IC15 Data Handbook and confirmed in the ordering information section of the N74F126D,623 product specification.

N74F126D,623 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74F

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: 15mA, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SO

N74F126D,623 FAQ

1.How can I place an order for N74F126D,623 through Aetrix?

Please submit a Request for Quotation (RFQ) for N74F126D,623 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 N74F126D,623 reliable?

The price and inventory of N74F126D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F126D,623 is usually 5 days.

3.What payment methods are accepted for N74F126D,623?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F126D,623 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for N74F126D,623?

N74F126D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your N74F126D,623 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 N74F126D,623?

For technical support, including N74F126D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F126D,623 requirements.

6.How does Aetrix verify that N74F126D,623 is sourced from the original manufacturer or authorized distributors?

All N74F126D,623 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 N74F126D,623 meets industry standards.

7.What is the process for return or replacement of N74F126D,623?

All N74F126D,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F126D,623, 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 N74F126D,623 part is unused and in its original packaging.

Return procedure for N74F126D,623:

1.Submit a request within 90 days.

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

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