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

Texas Instruments SN64BCT125AD

Name: SN64BCT125AD
Brand: Texas Instruments
SKU: SN64BCT125AD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN64BCT125AD

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN64BCT125AD.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN64BCT125AD from Texas Instruments is a quad 3-state bus buffer with independent line drivers, designed for address/data bus isolation in TTL-compatible 5-V systems. It features BiCMOS logic, 4.5–5.5 V supply operation, −40°C to 85°C temperature range, and SOIC-14 packaging - used in memory address buffering and microprocessor bus interfacing.

For engineers reviewing the SN64BCT125AD datasheet, SN64BCT125AD pinout, SN64BCT125AD application, or SN64BCT125AD equivalent, key selection criteria include 3-state output timing (tPLH ≤ 5.2 ns), low ICCZ standby current (6–14 mA), high noise immunity (VIH = 2 V, VIL = 0.8 V), and power-up high-impedance behavior critical for hot-swap and bus arbitration designs.

Technical Context

This BiCMOS quad buffer implements four independent non-inverting drivers, each controlled by its own active-low output-enable (OE) input. Outputs enter high-impedance state when OE is high, enabling bidirectional bus sharing without contention.

It operates strictly within 4.5–5.5 V VCC, supports 64 mA sink current per output, and guarantees rail-to-rail logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) across −40°C to 85°C. Input clamp current (−18 mA) and ESD protection (>2000 V per MIL-STD-883C) ensure robustness in industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS logic rails.
Output Drive	64 mA sink / −15 mA source - sufficient to drive 50-pF loads and multiple TTL inputs on shared buses.
Propagation Delay	tPLH/tPHL ≤ 5.2/6.9 ns @ 5 V - enables high-speed address/data buffering in 20+ MHz bus systems.
3-State Enable Time	tPZH/tPZL ≤ 9/10.4 ns - fast bus release minimizes contention windows during dynamic bus arbitration.
Input Thresholds	VIH = 2 V, VIL = 0.8 V - provides 0.4 V noise margin against TTL-level signals and reduces false triggering.
ICCZ Standby Current	6–14 mA @ VCC = 5.5 V - significantly lower than bipolar-only equivalents, reducing system power during idle states.

Pinout & Package

SN64BCT125AD is housed in a 14-pin SOIC (D) package, 3.9 mm wide, 8.75 mm long, 1.75 mm max height, with 1.27 mm pitch and NIPDAU lead finish (MSL Level-1).

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 5, 13	OE1–OE4 (active-low)	Independent 3-state enable controls per buffer - allows selective bus segment isolation without global reset.
2, 5, 10, 13	A1–A4 (inputs)	Non-inverting data inputs - accept TTL/CMOS logic levels; VIH/VIL thresholds ensure interoperability.
3, 6, 8, 11	Y1–Y4 (outputs)	3-state buffered outputs - drive bus lines directly; high-Z state prevents back-driving during disable.
7	GND	Ground reference - must be low-impedance connection to minimize switching noise coupling.
14	VCC	Positive supply - requires local 0.1 µF ceramic decoupling near pin to suppress transient current spikes.

Key Features

Feature	Design Value
State-of-the-art BiCMOS design	Combines bipolar speed and CMOS low ICCZ - achieves <7 ns propagation delay with <14 mA quiescent supply current.
High-impedance during power-up/down	Outputs remain in Hi-Z until VCC stabilizes above ~1.3 V - eliminates bus contention during system boot or brownout recovery.
3-state outputs drive bus lines	Each Y output can sink 64 mA - supports direct connection to 50-pF transmission lines or up to 10 standard TTL loads.
ESD protection >2000 V	Exceeds MIL-STD-883C Method 3015 - enables handling and board insertion without special ESD precautions.
Industrial temperature range	Specified from −40°C to +85°C - validated for use in embedded controllers, industrial PLCs, and telecom line cards.

Applications

Microprocessor Address Bus Buffering	Memory Address Register Isolation
Use Scenario: Isolating CPU address lines from multiple memory banks or peripherals sharing a common address bus. IC Role / Device Role / Timing Role: Quad non-inverting buffer with per-line 3-state control - enables dynamic address routing without bus contention. Use Value: tPZH ≤ 9 ns ensures rapid bus release before next address cycle, supporting >20 MHz CPU clock domains.	Use Scenario: Driving address inputs of SRAM, EPROM, or FPGA configuration memory while preventing back-drive from unselected devices. IC Role / Device Role / Timing Role: High-current 3-state driver - maintains signal integrity across PCB traces up to 15 cm long at 5 V. Use Value: 64 mA sink capability sustains valid logic levels under capacitive loading from 8+ memory devices.
Legacy ISA Bus Interface	Industrial I/O Expansion Module
Use Scenario: Interfacing modern microcontrollers to legacy ISA-bus peripheral cards requiring TTL-compatible address/data latching. IC Role / Device Role / Timing Role: Level-shifting and bus-driving buffer - translates 3.3-V MCU outputs to full 5-V TTL swing with guaranteed VIH/VIL margins. Use Value: VIH = 2 V and VIL = 0.8 V provide 0.4 V noise immunity against ISA bus crosstalk and ground bounce.	Use Scenario: Isolating programmable logic controller (PLC) I/O expansion modules from main backplane bus during hot-swap or fault conditions. IC Role / Device Role / Timing Role: Fault-tolerant bus isolator - high-impedance power-up behavior prevents spurious writes during module insertion. Use Value: Guaranteed Hi-Z state below VCC = 1.3 V eliminates bus glitches during partial power sequencing in modular chassis.

Microprocessor Address Bus Buffering

Memory Address Register Isolation

Use Scenario: Isolating CPU address lines from multiple memory banks or peripherals sharing a common address bus.

IC Role / Device Role / Timing Role: Quad non-inverting buffer with per-line 3-state control - enables dynamic address routing without bus contention.

Use Value: tPZH ≤ 9 ns ensures rapid bus release before next address cycle, supporting >20 MHz CPU clock domains.

Use Scenario: Driving address inputs of SRAM, EPROM, or FPGA configuration memory while preventing back-drive from unselected devices.

IC Role / Device Role / Timing Role: High-current 3-state driver - maintains signal integrity across PCB traces up to 15 cm long at 5 V.

Use Value: 64 mA sink capability sustains valid logic levels under capacitive loading from 8+ memory devices.

Legacy ISA Bus Interface

Industrial I/O Expansion Module

Use Scenario: Interfacing modern microcontrollers to legacy ISA-bus peripheral cards requiring TTL-compatible address/data latching.

IC Role / Device Role / Timing Role: Level-shifting and bus-driving buffer - translates 3.3-V MCU outputs to full 5-V TTL swing with guaranteed VIH/VIL margins.

Use Value: VIH = 2 V and VIL = 0.8 V provide 0.4 V noise immunity against ISA bus crosstalk and ground bounce.

Use Scenario: Isolating programmable logic controller (PLC) I/O expansion modules from main backplane bus during hot-swap or fault conditions.

IC Role / Device Role / Timing Role: Fault-tolerant bus isolator - high-impedance power-up behavior prevents spurious writes during module insertion.

Use Value: Guaranteed Hi-Z state below VCC = 1.3 V eliminates bus glitches during partial power sequencing in modular chassis.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74BCT244N	Octal (8-channel), PDIP-20 package, identical BiCMOS architecture and timing specs.	Higher channel count suits wider data buses; larger footprint and higher pin count limit space-constrained designs.	Choose when expanding from 4- to 8-bit bus width; not pin-compatible with SN64BCT125AD.
SN64BCT125AN	Same electrical specs and logic function, but in 14-pin PDIP (N) package instead of SOIC (D).	Through-hole mounting only; lacks SOIC's thermal and density advantages for surface-mount production.	Prefer for prototyping or legacy through-hole assembly; identical functionality but different mechanical interface.

Compared with SN74BCT244N and SN64BCT125AN, the SN64BCT125AD delivers identical logic performance in a compact SOIC-14 package optimized for automated SMT assembly, offering superior thermal dissipation and board area efficiency over PDIP, while providing half the channel count needed for narrower bus segments.

Availability

SN64BCT125AD is available at Aetrix Electronics and suitable for microprocessor address buffering, memory address register isolation, and industrial I/O expansion modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SN64BCT125AD 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN64BCT125AD belongs to TI's BCT family of BiCMOS bus transceivers, engineered specifically for high-speed, low-power 5-V TTL-compatible bus interfacing in mission-critical embedded systems.

FAQ

What is the operating voltage range for the SN64BCT125AD?

The SN64BCT125AD operates over a supply voltage range of 4.5 V to 5.5 V, with recommended nominal VCC at 5 V. Absolute maximum VCC is 7 V, but functional operation is only guaranteed within the 4.5–5.5 V range per the datasheet's recommended operating conditions. Operating outside this window may cause timing violations or increased ICCZ.

Does the SN64BCT125AD support hot-swap or live-insertion into a powered bus?

Yes - the SN64BCT125AD enters a high-impedance state during power-up and power-down, ensuring outputs remain Hi-Z until VCC stabilizes above ~1.3 V and after it drops below that threshold. This behavior prevents bus contention and signal corruption when inserted into an active 5-V system, making it suitable for hot-swap-capable backplane interfaces.

What is the maximum capacitive load the SN64BCT125AD can drive reliably?

The SN64BCT125AD is characterized for CL = 50 pF in switching tests, with tPLH/tPHL specified up to 6.9 ns. While not explicitly rated beyond 50 pF, its 64 mA sink capability supports driving typical PCB traces and up to 10 standard TTL inputs (≈40–50 pF total). For >50 pF loads, layout optimization and reduced edge rates are advised to maintain timing margins.

Is the SN64BCT125AD pin-compatible with other BCT-series buffers like the SN74BCT244?

No - the SN64BCT125AD is not pin-compatible with the SN74BCT244, which is octal and uses a 20-pin package. The SN64BCT125AD has a unique 14-pin SOIC pinout with dedicated OE pins per channel (pins 1, 4, 5, 13), whereas SN74BCT244 groups enables differently. Direct replacement requires PCB redesign.

What does the "A" suffix in SN64BCT125AD signify?

The "A" in SN64BCT125AD denotes the revised version compliant with updated electrical specifications and improved manufacturing process - including tighter ICCZ control (6–14 mA vs older versions up to 25 mA), enhanced ESD rating (>2000 V), and extended temperature validation. It supersedes earlier non-A variants and is the currently recommended production part.

SN64BCT125AD Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 64BCT

Package/Case:: 14-SOIC (0.154", 3.90mm 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:: 15mA, 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

SN64BCT125AD FAQ

1.How can I place an order for SN64BCT125AD through Aetrix?

Please submit a Request for Quotation (RFQ) for SN64BCT125AD 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 SN64BCT125AD reliable?

The price and inventory of SN64BCT125AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT125AD is usually 5 days.

3.What payment methods are accepted for SN64BCT125AD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT125AD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN64BCT125AD?

SN64BCT125AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN64BCT125AD 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 SN64BCT125AD?

For technical support, including SN64BCT125AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT125AD requirements.

6.How does Aetrix verify that SN64BCT125AD is sourced from the original manufacturer or authorized distributors?

All SN64BCT125AD 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 SN64BCT125AD meets industry standards.

7.What is the process for return or replacement of SN64BCT125AD?

All SN64BCT125AD units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT125AD, 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 SN64BCT125AD part is unused and in its original packaging.

Return procedure for SN64BCT125AD:

1.Submit a request within 90 days.

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

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