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

NXP Semiconductors N74F126N,602

Name: N74F126N,602
Brand: NXP Semiconductors
SKU: N74F126N,602
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: N74F126N,602

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: N74F126N,602.pdf

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

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Product details

Overview

N74F126N,602 from Philips Semiconductors is a quad 3-state buffer with active-high output enable inputs, 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 - enabling reliable signal isolation in industrial control backplanes.

For engineers reviewing the N74F126N,602 datasheet, N74F126N,602 pinout, N74F126N,602 application, or N74F126N,602 equivalent, key selection criteria include active-high OE logic, 14-pin DIP package compatibility, 3-state output timing (tPZH/tPHZ ≤ 8.5 ns), and I_OL/I_OH drive capability matching legacy 74F bus architectures.

Technical Context

The N74F126N,602 implements four independent non-inverting buffers, each with a dedicated active-high output enable (OE) input controlling high-impedance state entry/exit. Its bipolar FET (74F) process ensures fast switching while maintaining TTL voltage thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and compatible loading (1.0 U.L. input).

Each buffer supports bidirectional bus driving via 3-state outputs rated for –15 mA (high) and 64 mA (low), with disable times (t_PHZ/t_PLZ) as low as 1.5 ns (typ) and enable times (t_PZH/t_PZL) of 4.0 ns (typ), ensuring minimal bus contention during state transitions.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Quad non-inverting 3-state buffer with active-high OE
V_CC Range	4.5 V to 5.5 V - matches standard TTL supply rails without regulation
t_PLH/t_PHL	2.0–8.5 ns - enables sub-100 MHz bus operation with margin
I_OH/I_OL	–15 mA / 64 mA - drives up to 10 standard TTL loads per output
Input Loading	20 µA max in both states - reduces fan-out burden on upstream drivers
Operating Temperature	0°C to +70°C - certified for commercial-grade embedded control environments
Output Disable Time	t_PHZ/t_PLZ ≤ 6.0 ns (max) - minimizes bus release latency

Pinout & Package

Package: 14-pin plastic DIP (SOT27-1), 300 mil width, through-hole mountable with 0.1″ lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	OE0–OE3 (active-high)	Enable control per buffer; logic HIGH activates output, LOW forces high-Z
2, 5, 9, 12	D0–D3 (data inputs)	Non-inverting input signals; TTL-compatible thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V)
3, 6, 8, 11	Q0–Q3 (data outputs)	3-state buffered outputs; support bus sharing with <100 ns contention window
7	GND	Ground reference for all logic and output stages
14	V_CC	+5 V supply; decoupling required within 1 inch for stable AC performance

Key Features

Feature	Design Value
Active-high output enable	Eliminates external inverters when interfacing with microcontroller GPIOs that default to LOW at reset
High-speed 74F process	5.0 ns typical propagation delay enables synchronous bus clocking up to 100 MHz
TTL-compatible input loading	20 µA max input current simplifies cascading with legacy 74LS/74F drivers without pull-up compensation
Robust 3-state output drive	64 mA sink capability supports direct connection to terminated transmission lines or multiple TTL inputs
Industrial temperature range	0°C to +70°C rating ensures reliability in fanless control cabinets and factory-floor PLC modules

Applications

Industrial Backplane Bus Isolation	Microcontroller Peripheral Expansion
Use Scenario: Isolating address/data buses between CPU and peripheral cards in modular PLC racks to prevent signal contention during hot-swap. IC Role / Device Role / Timing Role: Quad 3-state buffer providing per-lane direction control and bus release timing coordination. Use Value: t_PHZ/t_PLZ ≤ 6.0 ns ensures rapid bus release before next card asserts its drivers, eliminating glitches.	Use Scenario: Expanding GPIO count of an 8-bit microcontroller to drive multiple parallel peripherals (LCD, keypad, ADC) without bus conflict. IC Role / Device Role / Timing Role: Output-enable-gated signal repeater allowing time-multiplexed peripheral access via software-controlled OE lines. Use Value: Active-high OE aligns with MCU GPIO defaults, reducing initialization code complexity and startup race conditions.
Legacy TTL System Upgrades	Test Equipment Signal Gating
Use Scenario: Replacing obsolete 74LS126 in aging test fixtures where timing margins are tight and board rework is prohibited. IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade delivering faster propagation (5.0 ns vs. 15 ns) and stronger drive (64 mA vs. 24 mA). Use Value: Maintains existing PCB layout while improving setup/hold timing margins by >30% across all four channels.	Use Scenario: Enabling/disabling analog multiplexer control lines in automated test systems based on sequencer commands. IC Role / Device Role / Timing Role: Precision-gated signal conditioner converting slow control logic into clean, slew-controlled enable pulses. Use Value: Low 20 µA input current prevents loading of FPGA output banks, preserving signal integrity on dense control buses.

Industrial Backplane Bus Isolation

Microcontroller Peripheral Expansion

Use Scenario: Isolating address/data buses between CPU and peripheral cards in modular PLC racks to prevent signal contention during hot-swap.

IC Role / Device Role / Timing Role: Quad 3-state buffer providing per-lane direction control and bus release timing coordination.

Use Value: t_PHZ/t_PLZ ≤ 6.0 ns ensures rapid bus release before next card asserts its drivers, eliminating glitches.

Use Scenario: Expanding GPIO count of an 8-bit microcontroller to drive multiple parallel peripherals (LCD, keypad, ADC) without bus conflict.

IC Role / Device Role / Timing Role: Output-enable-gated signal repeater allowing time-multiplexed peripheral access via software-controlled OE lines.

Use Value: Active-high OE aligns with MCU GPIO defaults, reducing initialization code complexity and startup race conditions.

Legacy TTL System Upgrades

Test Equipment Signal Gating

Use Scenario: Replacing obsolete 74LS126 in aging test fixtures where timing margins are tight and board rework is prohibited.

IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade delivering faster propagation (5.0 ns vs. 15 ns) and stronger drive (64 mA vs. 24 mA).

Use Value: Maintains existing PCB layout while improving setup/hold timing margins by >30% across all four channels.

Use Scenario: Enabling/disabling analog multiplexer control lines in automated test systems based on sequencer commands.

IC Role / Device Role / Timing Role: Precision-gated signal conditioner converting slow control logic into clean, slew-controlled enable pulses.

Use Value: Low 20 µA input current prevents loading of FPGA output banks, preserving signal integrity on dense control buses.

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	Identical logic, timing, and DC specs; Texas Instruments second-source part with same 14-pin DIP package	No functional or layout change required; qualified for identical commercial temperature range	Select when TI sourcing preference or dual-sourcing strategy applies
74ACT126PC	CMOS process; 5 V tolerant inputs, lower ICC (4 µA typ), but slower t_PZH (8.5 ns min) and no 74F speed grade	Higher noise immunity and rail-to-rail input swing, but incompatible with 74F timing-critical paths	Choose only if power efficiency > speed, and system timing budget allows ≥2 ns added enable delay

Compared with SN74F126N and 74ACT126PC, the N74F126N,602 provides guaranteed 74F-speed timing (≤8.5 ns enable/disable) and proven interoperability with legacy TTL buses - making it the preferred choice for timing-sensitive industrial upgrades where drop-in replacement and deterministic bus arbitration are mandatory.

Availability

N74F126N,602 is available at Aetrix Electronics and suitable for industrial backplane bus isolation, microcontroller peripheral expansion, and legacy TTL system upgrades requiring stable component supply and long-term obsolescence management.

Supply support for N74F126N,602 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 pioneer in bipolar logic ICs, known for high-reliability 74F, 74HC, and automotive-grade logic families.

The 74F126 series was engineered specifically for high-speed bus interface in commercial-grade industrial controllers and test equipment, emphasizing timing predictability, TTL compatibility, and robust 3-state output behavior under capacitive load.

FAQ

What is the logic polarity of the output enable inputs on the N74F126N,602?

The N74F126N,602 features active-high output enable (OE) inputs: when OE is HIGH, the corresponding Q output follows the D input; when OE is LOW, the Q output enters high-impedance (Z) state. This differs from the N74F125N,602, which uses active-low OE. The N74F126N,602's active-high OE simplifies interface with microcontrollers whose GPIOs default to LOW at power-on reset.

Does the N74F126N,602 support mixed-voltage operation (e.g., 3.3 V inputs with 5 V V_CC)?

No, the N74F126N,602 is a 5 V-only TTL-family device. Its input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and absolute maximum ratings (V_IN = –0.5 V to +7.0 V) assume 5 V V_CC. Applying 3.3 V logic directly to inputs is acceptable only if the source can drive ≥20 µA at 2.0 V, but full 3.3 V ↔ 5 V level translation requires external circuitry. The N74F126N,602 does not tolerate sustained 3.3 V V_CC.

What is the maximum capacitive load the N74F126N,602 can drive while maintaining specified AC performance?

The N74F126N,602 AC specifications (propagation delay, enable/disable times) are characterized at C_L = 50 pF with R_L = 500 Ω. Driving loads >50 pF increases t_PLH/t_PHL and t_PZH/t_PZL nonlinearly; for 100 pF, delay degradation exceeds 30%. To maintain timing compliance, keep total node capacitance ≤50 pF using short traces, minimized stubs, and avoid daisy-chaining more than two downstream TTL inputs per N74F126N,602 output.

Can the N74F126N,602 be used in place of the N74F125N,602 without circuit modification?

No - although pinout and DC specs match, the N74F126N,602 has active-high OE while the N74F125N,602 has active-low OE. Swapping them requires inverting all OE control signals or redesigning the enable logic. The N74F126N,602 will not function correctly if driven by open-collector or active-low OE sources intended for the N74F125N,602. Always verify OE polarity in the system schematic before substitution.

Is the N74F126N,602 RoHS compliant?

The original N74F126N,602 (manufactured pre-2006) is not RoHS compliant, as it contains leaded solder in the 14-pin DIP package and uses lead-based die attach. Modern RoHS-compliant equivalents (e.g., 74ACT126 or SN74LVC126A) exist but differ electrically and thermally. For legacy repair or exact-form-fit replacement, the N74F126N,602 remains available with full traceability; RoHS conversion requires full redesign and qualification.

N74F126N,602 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74F

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Tube

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:: Through Hole

Supplier Device Package:: 14-DIP

N74F126N,602 FAQ

1.How can I place an order for N74F126N,602 through Aetrix?

Please submit a Request for Quotation (RFQ) for N74F126N,602 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 N74F126N,602 reliable?

The price and inventory of N74F126N,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F126N,602 is usually 5 days.

3.What payment methods are accepted for N74F126N,602?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F126N,602 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for N74F126N,602?

N74F126N,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your N74F126N,602 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 N74F126N,602?

For technical support, including N74F126N,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F126N,602 requirements.

6.How does Aetrix verify that N74F126N,602 is sourced from the original manufacturer or authorized distributors?

All N74F126N,602 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 N74F126N,602 meets industry standards.

7.What is the process for return or replacement of N74F126N,602?

All N74F126N,602 units undergo pre-shipment inspection (PSI). If there is an issue with N74F126N,602, 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 N74F126N,602 part is unused and in its original packaging.

Return procedure for N74F126N,602:

1.Submit a request within 90 days.

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

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