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

Texas Instruments SN74ABT125NS

Name: SN74ABT125NS
Brand: Texas Instruments
SKU: SN74ABT125NS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT125NS

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-SOIC (0.209", 5.30mm Width)

Datasheet:: SN74ABT125NS.pdf

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

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Product details

Overview

SN74ABT125NS from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for high-speed TTL-compatible data routing in industrial control and embedded system backplanes. It delivers −32-mA high-level and 64-mA low-level output drive, supports hot insertion via I_off and power-up 3-state, and operates across −40°C to 85°C at 4.5–5.5 V.

For engineers reviewing the SN74ABT125NS datasheet, SN74ABT125NS pinout, SN74ABT125NS application, or SN74ABT125NS equivalent, key selection criteria include its 3-state bus isolation capability, ground-bounce immunity (<1 V VOLP), latch-up robustness (>500 mA), and compatibility with SOP-14 (NS) packaging for space-constrained PCB layouts.

Technical Context

The SN74ABT125NS implements four independent noninverting buffers, each controlled by a dedicated output-enable (OE) input that places the Y output in high-impedance when asserted high. Its I_off circuitry actively disables outputs during power-down to prevent current backflow, while power-up 3-state ensures outputs remain tri-stated during V_CC ramp-up.

It features TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V), low propagation delays (t_PLH/t_PHL ≤ 4.9 ns at 5 V), and robust ESD protection (2000-V HBM, 200-V MM), making it suitable for noisy industrial environments where signal integrity and hot-swap reliability are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5–5.5 V - Ensures stable operation across standard 5-V rail tolerances without regulation overhead.
Output Drive	−32 mA IOH / 64 mA IOL - Supports driving heavy capacitive loads or multiple TTL inputs without external buffers.
Propagation Delay	≤4.9 ns (t_PLH, t_PHL) - Enables reliable timing in sub-200-MHz digital buses with margin.
Ground Bounce	<1 V VOLP - Minimizes noise coupling into shared ground planes during simultaneous switching.
Latch-Up Immunity	>500 mA per JEDEC JESD-17 - Guarantees survivability under transient overcurrent events in industrial systems.
ESD Protection	2000-V HBM, 200-V MM - Meets IEC 61000-4-2 Level 2 requirements for board-level ESD resilience.
Operating Temperature	−40°C to +85°C - Qualified for extended industrial temperature range without derating.

Pinout & Package

SOP-14 (NS) package: 14-pin small-outline plastic package with 1.27-mm lead pitch, 8.1 mm × 10.4 mm body size, and gull-wing leads compatible with standard reflow profiles (MSL Level-1).

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	Output Enable (1OE, 2OE, 3OE, 4OE)	Active-low logic control per buffer; high = high-Z output, enabling independent bus arbitration.
2, 5, 11, 14	Input (1A, 2A, 3A, 4A)	TTL-compatible input with 0.8 V/2.0 V thresholds; accepts standard 5-V logic signals directly.
3, 6, 12, 9	Output (1Y, 2Y, 3Y, 4Y)	Noninverting buffered output with ±100 µA high-Z leakage and fast edge rates.
7	GND	Power return reference for all internal circuits and output drivers.
14	V_CC	Primary 5-V supply; decoupling capacitor placement near this pin is mandatory for noise suppression.

Key Features

Feature	Design Value
I_off Support	Active output disable during power-down prevents backflow current, enabling safe hot-insertion into live backplanes.
Power-Up 3-State	Outputs remain high-impedance until V_CC stabilizes, eliminating bus contention during system boot.
High-Drive Outputs	−32 mA/64 mA drive strength allows direct interfacing with legacy TTL loads without level-shifting.
Low Ground Bounce	<1 V VOLP at 25°C ensures minimal noise injection into shared ground networks during switching.
Hot-Swap Ready	Combined I_off and power-up 3-state meet JEDEC JESD63 compliance for modular system upgrades.

Applications

Industrial PLC Backplane Interface	Embedded System Data Bus Isolation
Use Scenario: Isolating CPU address/data lines from peripheral modules in programmable logic controllers during module replacement. IC Role / Device Role / Timing Role: Quad 3-state buffer providing bidirectional bus segmentation and hot-swap-safe enable control. Use Value: Prevents bus contention and backflow current during live module insertion, reducing system downtime and field failure risk.	Use Scenario: Buffering UART, SPI, or parallel control signals between microcontroller and sensor/actuator subsystems. IC Role / Device Role / Timing Role: Signal integrity-preserving repeater with TTL-compatible thresholds and sub-5-ns propagation delay. Use Value: Maintains timing margins across long PCB traces while supporting mixed-voltage domain interfacing.
Test Equipment Signal Routing	Legacy System Bus Expansion
Use Scenario: Multiplexing test vectors across multiple DUT interfaces in automated test equipment racks. IC Role / Device Role / Timing Role: Independent OE-controlled buffer enabling dynamic signal path selection without FPGA resource usage. Use Value: Reduces FPGA I/O count and simplifies test pattern generation by offloading routing logic to discrete logic.	Use Scenario: Extending ISA or similar 8/16-bit parallel buses in retro-computing or industrial retrofit applications. IC Role / Device Role / Timing Role: High-drive bus driver maintaining signal integrity across extended trace lengths and multiple load capacitances. Use Value: Eliminates need for active termination or additional repeaters, lowering BOM cost and layout complexity.

Industrial PLC Backplane Interface

Embedded System Data Bus Isolation

Use Scenario: Isolating CPU address/data lines from peripheral modules in programmable logic controllers during module replacement.

IC Role / Device Role / Timing Role: Quad 3-state buffer providing bidirectional bus segmentation and hot-swap-safe enable control.

Use Value: Prevents bus contention and backflow current during live module insertion, reducing system downtime and field failure risk.

Use Scenario: Buffering UART, SPI, or parallel control signals between microcontroller and sensor/actuator subsystems.

IC Role / Device Role / Timing Role: Signal integrity-preserving repeater with TTL-compatible thresholds and sub-5-ns propagation delay.

Use Value: Maintains timing margins across long PCB traces while supporting mixed-voltage domain interfacing.

Test Equipment Signal Routing

Legacy System Bus Expansion

Use Scenario: Multiplexing test vectors across multiple DUT interfaces in automated test equipment racks.

IC Role / Device Role / Timing Role: Independent OE-controlled buffer enabling dynamic signal path selection without FPGA resource usage.

Use Value: Reduces FPGA I/O count and simplifies test pattern generation by offloading routing logic to discrete logic.

Use Scenario: Extending ISA or similar 8/16-bit parallel buses in retro-computing or industrial retrofit applications.

IC Role / Device Role / Timing Role: High-drive bus driver maintaining signal integrity across extended trace lengths and multiple load capacitances.

Use Value: Eliminates need for active termination or additional repeaters, lowering BOM cost and layout complexity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ABT125DR	SOIC-14 (D) package; identical electrical specs but 3.9-mm width vs. NS's 4.4-mm width and different thermal resistance (86°C/W vs. 76°C/W).	Same functional role; preferred for designs already using SOIC footprints or requiring higher thermal dissipation margin.	Select SN74ABT125DR if board layout uses standard SOIC-14 land pattern and thermal management prioritizes lower θ_JA.
SN74ABT125PWR	TSSOP-14 (PW) package; same logic and drive specs but smaller footprint (5.0 × 4.4 mm), higher θ_JA (113°C/W), and MSL Level-1 reflow profile.	Used where PCB area is constrained; requires tighter thermal design due to higher junction-to-ambient resistance.	Choose SN74ABT125PWR only when board real estate is critical and thermal derating is acceptable.

Compared with SN74ABT125DR and SN74ABT125PWR, the SN74ABT125NS offers a balanced trade-off: wider SOP-14 body improves manual handling and solder joint reliability over TSSOP, while its 76°C/W θ_JA provides better thermal performance than TSSOP yet retains compatibility with legacy SOP layouts.

Availability

SN74ABT125NS is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, embedded system data bus isolation, and test equipment signal routing requiring stable component supply and long-term lifecycle support.

Supply support for SN74ABT125NS 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience in industrial-grade interface ICs.

The SN74ABT125NS belongs to TI's ABT logic family, engineered specifically for high-noise industrial environments requiring robust hot-swap capability, strong drive strength, and guaranteed 3-state behavior during power transitions.

FAQ

What is the maximum output current rating for SN74ABT125NS?

The SN74ABT125NS supports −32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) under recommended operating conditions. These values are specified at V_CC = 4.5–5.5 V and ensure reliable drive into standard TTL loads without exceeding absolute maximum ratings. Exceeding these currents risks thermal overstress or parametric shift.

Does SN74ABT125NS support hot insertion in live backplane systems?

Yes, SN74ABT125NS supports hot insertion through two integrated features: I_off circuitry disables outputs when V_CC = 0 V to block backflow current, and power-up 3-state holds outputs in high-impedance during V_CC ramp-up. These functions are explicitly validated per JEDEC JESD63 and enable safe module replacement in powered systems without disrupting bus operation.

What is the recommended pull-up resistor value for OE pins on SN74ABT125NS?

TI recommends tying unused OE pins to V_CC via a pull-up resistor whose minimum value is determined by the current-sinking capability of the upstream driver. For typical 5-V CMOS drivers, a 10-kΩ resistor is sufficient; lower values (e.g., 4.7 kΩ) improve noise immunity but increase static current. The SN74ABT125NS datasheet specifies no minimum OE input current, so resistor selection balances speed, noise margin, and power.

Can SN74ABT125NS operate reliably at 4.5 V supply voltage?

Yes, SN74ABT125NS is fully specified from 4.5 V to 5.5 V. At V_CC = 4.5 V, it maintains VOH ≥ 2.0 V (with IOH = −32 mA), VOL ≤ 0.55 V (with IOL = 64 mA), and propagation delays within datasheet limits (t_PLH/t_PHL ≤ 6 ns). This makes it suitable for systems using undervolted 5-V rails or brown-out tolerant designs.

Is SN74ABT125NS pin-compatible with other ABT-series quad buffers?

Yes, SN74ABT125NS shares identical pinout and function with all SN74ABT125 variants in 14-pin packages (D, DB, N, PW, RGY), including SN74ABT125DR and SN74ABT125PWR. Pin mapping for OE, A, Y, GND, and V_CC is consistent across SOP-14, SOIC-14, SSOP-14, TSSOP-14, and VQFN-14 packages, enabling footprint interchangeability where mechanical constraints allow.

SN74ABT125NS Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ABT

Package/Case:: 14-SOIC (0.209", 5.30mm 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:: 32mA, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SO

SN74ABT125NS FAQ

1.How can I place an order for SN74ABT125NS through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT125NS 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 SN74ABT125NS reliable?

The price and inventory of SN74ABT125NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT125NS is usually 5 days.

3.What payment methods are accepted for SN74ABT125NS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT125NS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ABT125NS?

SN74ABT125NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT125NS 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 SN74ABT125NS?

For technical support, including SN74ABT125NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT125NS requirements.

6.How does Aetrix verify that SN74ABT125NS is sourced from the original manufacturer or authorized distributors?

All SN74ABT125NS 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 SN74ABT125NS meets industry standards.

7.What is the process for return or replacement of SN74ABT125NS?

All SN74ABT125NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT125NS, 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 SN74ABT125NS part is unused and in its original packaging.

Return procedure for SN74ABT125NS:

1.Submit a request within 90 days.

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

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