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

Texas Instruments SN74ABT125DG4

Name: SN74ABT125DG4
Brand: Texas Instruments
SKU: SN74ABT125DG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT125DG4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN74ABT125DG4.pdf

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

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Product details

Overview

SN74ABT125DG4 from Texas Instruments is a quadruple 3-state bus buffer gate IC designed for high-speed, hot-pluggable data bus isolation in industrial and telecom backplanes. It delivers −32 mA high-level and 64 mA low-level output drive, supports Ioff and power-up 3-state for safe insertion, and operates across −40°C to 85°C with 4.5–5.5 V supply. Its primary role is bidirectional signal buffering with independent enable control per channel.

For engineers reviewing the SN74ABT125DG4 datasheet, SN74ABT125DG4 pinout, SN74ABT125DG4 application, or SN74ABT125DG4 equivalent, this page provides verified electrical specs, SOIC-14 package details, thermal performance (θJA = 86°C/W), hot-insertion design guidance, and validated alternatives for bus interface upgrades and legacy system replacements.

Technical Context

The SN74ABT125DG4 implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) inputs controlling high-impedance state entry/exit. Its ABT logic family uses bipolar transistor technology to achieve TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and fast propagation delays (tPLH/tPHL ≤ 4.9 ns at 5 V).

It integrates Ioff circuitry that disables outputs when VCC = 0 V (±100 µA leakage), and power-up 3-state logic that forces outputs into high-Z during supply ramp-up/down-preventing bus contention without external pull-ups on OE lines when properly configured.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - ensures compatibility with 5-V TTL and mixed-voltage systems; operation outside this range risks latch-up or parametric failure.
Output Drive	−32 mA IOH / 64 mA IOL - enables direct driving of heavy capacitive loads (e.g., >100 pF buses) and fan-out to ≥10 standard TTL inputs.
Propagation Delay	tPLH/tPHL ≤ 4.9 ns @ 5 V - supports >100 MHz bus toggle rates in point-to-point configurations with controlled trace impedance.
Hot-Insertion Support	Ioff ≤ ±100 µA @ VCC = 0 V - prevents back-current damage during live board insertion; eliminates need for external series resistors on I/O lines.
Input Hysteresis	Vhys = 100 mV - rejects noise on slow-rising or floating control signals (e.g., mechanical switch inputs or long PCB traces).
Thermal Resistance	θJA = 86°C/W (SOIC-D package) - defines maximum power dissipation (≈150 mW at ΔT = 13°C rise) before derating is required in still-air environments.
ESD Rating	2000-V HBM, 200-V MM - exceeds JEDEC JESD22-A114/A115 requirements, enabling robust handling in manual assembly and field-replaceable modules.

Pinout & Package

SN74ABT125DG4 is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 3.91 mm × 1.75 mm (max height), RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	OE (Output Enable)	Active-low control per buffer; must be pulled high via resistor during power-up to ensure high-Z state until firmware initializes.
2, 5, 11, 14	A (Input)	Noninverting data input; accepts TTL-level signals (0.8 V/2.0 V thresholds); 3 pF typical input capacitance minimizes loading on source drivers.
3, 6, 12, 9	Y (Output)	3-state buffered output; sinks up to 64 mA or sources −32 mA; exhibits <1 V ground bounce under heavy switching (VOLP).
7	GND	Digital ground reference; requires low-inductance connection to PCB ground plane to suppress switching noise coupling into other channels.
14	VCC	5-V power supply; decoupling capacitor (0.1 µF ceramic + 10 µF tantalum) mandatory within 5 mm of pin to stabilize rail during output transitions.

Key Features

Feature	Design Value
Independent 3-State Control	Four separate OE pins allow selective isolation of individual data lanes-enabling partial bus reconfiguration without resetting entire subsystems.
Ioff Protection	Blocks current flow between powered and unpowered sections of a backplane, preventing damage during hot-swap events in modular rack systems.
Power-Up 3-State	Guarantees high-impedance outputs during VCC ramp-up, eliminating bus conflicts even if OE signals are undefined or floating at power-on.
High-Drive Outputs	−32 mA/64 mA drive strength supports legacy 5-V TTL loads and reduces need for external line drivers in industrial PLC I/O modules.
Latch-Up Immunity	Exceeds 500 mA per JEDEC JESD17 - ensures reliability in electrically noisy environments like motor drives and power supply control boards.

Applications

Industrial Backplane Buffering	Telecom Line Card Interface
Use Scenario: Isolating CPU address/data buses from peripheral slots in modular PLC chassis where cards are inserted/removed under power. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-lane 3-state control, ensuring no signal contention during card hot-swap sequences. Use Value: Eliminates need for complex FPGA-based bus arbitration logic; leverages built-in Ioff and power-up 3-state to meet IEC 61000-4-2 compliance for field-replaceable units.	Use Scenario: Driving parallel control signals (e.g., reset, interrupt, clock enable) between DSP and FPGA on telecom line cards with mixed-voltage domains. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer with sub-5 ns propagation delay, synchronizing control timing across multiple ASICs. Use Value: Enables deterministic setup/hold timing margins (<1 ns jitter) for multi-chip synchronization without adding programmable delay elements.
Legacy System Bus Extension	Test Equipment Signal Routing
Use Scenario: Extending 5-V TTL bus length beyond 15 cm in aging test fixtures where signal integrity degrades due to stub reflections and crosstalk. IC Role / Device Role / Timing Role: Active repeater buffer restoring edge rate and voltage swing; each channel independently enabled to reduce standby power. Use Value: Restores signal fidelity (VOL ≤ 0.55 V, VOH ≥ 2.5 V) over 30-cm ribbon cables while maintaining <5 ns skew between lanes.	Use Scenario: Multiplexing DUT control lines (e.g., SPI CS#, I²C EN) in automated test equipment where multiple devices share common busses. IC Role / Device Role / Timing Role: Channel-selectable bus isolator; OE pins driven by microcontroller GPIO to enable only one DUT at a time. Use Value: Prevents accidental activation of unintended devices during test sequencing-reducing false-fail rates and protecting sensitive DUTs from bus contention.

Industrial Backplane Buffering

Telecom Line Card Interface

Use Scenario: Isolating CPU address/data buses from peripheral slots in modular PLC chassis where cards are inserted/removed under power.

IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-lane 3-state control, ensuring no signal contention during card hot-swap sequences.

Use Value: Eliminates need for complex FPGA-based bus arbitration logic; leverages built-in Ioff and power-up 3-state to meet IEC 61000-4-2 compliance for field-replaceable units.

Use Scenario: Driving parallel control signals (e.g., reset, interrupt, clock enable) between DSP and FPGA on telecom line cards with mixed-voltage domains.

IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer with sub-5 ns propagation delay, synchronizing control timing across multiple ASICs.

Use Value: Enables deterministic setup/hold timing margins (<1 ns jitter) for multi-chip synchronization without adding programmable delay elements.

Legacy System Bus Extension

Test Equipment Signal Routing

Use Scenario: Extending 5-V TTL bus length beyond 15 cm in aging test fixtures where signal integrity degrades due to stub reflections and crosstalk.

IC Role / Device Role / Timing Role: Active repeater buffer restoring edge rate and voltage swing; each channel independently enabled to reduce standby power.

Use Value: Restores signal fidelity (VOL ≤ 0.55 V, VOH ≥ 2.5 V) over 30-cm ribbon cables while maintaining <5 ns skew between lanes.

Use Scenario: Multiplexing DUT control lines (e.g., SPI CS#, I²C EN) in automated test equipment where multiple devices share common busses.

IC Role / Device Role / Timing Role: Channel-selectable bus isolator; OE pins driven by microcontroller GPIO to enable only one DUT at a time.

Use Value: Prevents accidental activation of unintended devices during test sequencing-reducing false-fail rates and protecting sensitive DUTs from bus contention.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC125APWR	Lower drive (−24 mA/24 mA), 1.65–3.6 V supply, CMOS process - consumes ~80% less static current but lacks Ioff and power-up 3-state.	Suitable for battery-powered portable instruments; not rated for hot-insertion or 5-V bus interfacing.	Select when operating below 3.3 V and thermal/power budgets are constrained; verify external OE pull-up and bus contention mitigation.
SN74AHCT125N	Same 14-pin PDIP/SOIC footprint, 4.5–5.5 V supply, but lower drive (−8 mA/8 mA) and slower speed (tPD ≤ 10 ns); includes Ioff but no power-up 3-state.	Fits legacy through-hole designs requiring drop-in replacement with minimal layout change; insufficient for high-fanout backplane loads.	Choose for cost-sensitive, low-speed upgrades of older 74LS125-based systems where drive strength and ground bounce are non-critical.

Compared with SN74LVC125APWR and SN74AHCT125N, the SN74ABT125DG4 uniquely combines 5-V hot-plug safety, high-current drive, and sub-5 ns timing-making it irreplaceable in industrial backplane and telecom line card applications demanding simultaneous robustness and speed.

Availability

SN74ABT125DG4 is available at Aetrix Electronics and suitable for industrial backplane buffering, telecom line card interface, legacy system bus extension, and test equipment signal routing requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT125DG4 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74ABT125DG4 belongs to TI's ABT logic family-engineered for high-speed, hot-pluggable 5-V digital interfaces in mission-critical infrastructure where bus reliability, noise immunity, and power sequencing integrity are non-negotiable.

FAQ

What is the recommended pull-up resistor value for OE pins on SN74ABT125DG4 during power-up?

The minimum OE pull-up resistor value depends on the current-sinking capability of the driver controlling OE. For standard 5-V TTL drivers (≥16 mA sink), a 4.7-kΩ resistor ensures OE remains above 2 V during power ramp-up while limiting current to <1 mA. TI recommends tying OE to VCC through this resistor to guarantee high-impedance state at power-on-critical for hot-insertion safety in the SN74ABT125DG4.

Does SN74ABT125DG4 support operation at 3.3 V supply?

No, SN74ABT125DG4 is specified only for 4.5 V to 5.5 V operation. Its ABT logic family uses bipolar transistor architecture optimized for 5-V TTL compatibility; operation below 4.5 V violates recommended conditions and results in undefined output states, increased propagation delay (>10 ns), and potential failure to meet VIH/VIL thresholds. Use SN74LVC125 for 3.3-V systems.

How does the Ioff feature of SN74ABT125DG4 protect during hot-insertion?

The Ioff circuitry in SN74ABT125DG4 actively disables all outputs when VCC = 0 V, limiting leakage current to ±100 µA even if live signals are present on A or Y pins. This prevents damaging back-current flow from powered backplane traces into the unpowered IC-eliminating risk of latch-up or metallization damage during live card insertion, a key requirement for SN74ABT125DG4 in modular industrial systems.

Can SN74ABT125DG4 replace SN74LS125 in existing designs?

Yes, SN74ABT125DG4 is pin-compatible with SN74LS125 in SOIC-14 packages and offers superior performance: 4× higher output drive (64 mA vs. 16 mA), 50% faster propagation delay (≤4.9 ns vs. ≤10 ns), and added Ioff/power-up 3-state for hot-swap safety. However, verify VCC decoupling and ground layout-SN74ABT125DG4's higher edge rates demand tighter noise control than LS-series parts.

What is the maximum capacitive load SN74ABT125DG4 can drive while maintaining timing specs?

SN74ABT125DG4 maintains its published tPLH/tPHL ≤ 4.9 ns and VOL ≤ 0.55 V specifications driving up to 50 pF (per the load circuit in Figure 1). With heavier loads (e.g., 100 pF), propagation delay increases to ~7 ns and ground bounce may exceed 1 V-requiring careful PCB layout (short traces, ground plane) or adding series termination. Always validate timing margins in final SN74ABT125DG4 application circuits.

SN74ABT125DG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ABT

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

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

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-SOIC

SN74ABT125DG4 FAQ

1.How can I place an order for SN74ABT125DG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT125DG4 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 SN74ABT125DG4 reliable?

The price and inventory of SN74ABT125DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT125DG4 is usually 5 days.

3.What payment methods are accepted for SN74ABT125DG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT125DG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ABT125DG4?

SN74ABT125DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT125DG4 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 SN74ABT125DG4?

For technical support, including SN74ABT125DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT125DG4 requirements.

6.How does Aetrix verify that SN74ABT125DG4 is sourced from the original manufacturer or authorized distributors?

All SN74ABT125DG4 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 SN74ABT125DG4 meets industry standards.

7.What is the process for return or replacement of SN74ABT125DG4?

All SN74ABT125DG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT125DG4, 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 SN74ABT125DG4 part is unused and in its original packaging.

Return procedure for SN74ABT125DG4:

1.Submit a request within 90 days.

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

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