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Texas Instruments SN64BCT126AN
- Part No.:
- SN64BCT126AN
- Manufacturer:
- Texas Instruments
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
SN64BCT126AN.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,188
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Product details
Overview
SN64BCT126AN from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for address/data bus isolation and memory interface buffering in 5-V TTL/CMOS systems. It features four independent non-inverting buffers, each with active-low output-enable control, 64 mA low-level output drive, 3.3 V VOH at –15 mA, and operation across –40°C to 85°C.
For engineers reviewing the SN64BCT126AN datasheet, SN64BCT126AN pinout, SN64BCT126AN application, or SN64BCT126AN equivalent, key selection factors include 3-state bus driving capability, BiCMOS power efficiency (ICCZ ≤ 10 mA), high-impedance behavior during power sequencing, and compatibility with standard 14-pin 300-mil DIP packaging.
Technical Context
The SN64BCT126AN implements a BiCMOS architecture that combines bipolar speed with CMOS input characteristics and reduced quiescent current (ICCZ). Its 3-state outputs support bidirectional bus contention management via individual OE controls per channel.
Each buffer operates with TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and delivers rail-to-rail logic levels under load: VOL ≤ 0.55 V at 64 mA sink, VOH ≥ 2.4 V at –3 mA source. Propagation delays range from 1.5 ns to 7.7 ns depending on transition type and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation in standard 5-V digital systems with ±10% supply tolerance. |
| IOL / IOH | 64 mA / –15 mA - supports direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| tPLH / tPHL | 1.5 ns to 6.9 ns - enables high-speed data path buffering in memory address latching and peripheral interface timing-critical paths. |
| IOZH / IOZL | ±50 µA - guarantees low leakage in high-impedance state, preventing unintended bus loading during disable or power transitions. |
| Operating Temp | –40°C to 85°C - qualified for industrial-grade embedded control, instrumentation, and legacy computing applications. |
| ESD Rating | >2000 V HBM - provides robust handling margin during board assembly and field service without additional protection circuitry. |
Pinout & Package
SN64BCT126AN is supplied in a 14-pin plastic dual in-line package (PDIP), 300-mil width, with standard through-hole mounting and industry-compatible footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Output Enable (OE) | Active-low control per buffer; asserts high-impedance state when logic low, enabling independent bus arbitration. |
| 2, 5, 10, 13 | Data Input (A) | Non-inverting input for each buffer channel; accepts TTL/CMOS logic levels with 4 pF input capacitance. |
| 3, 6, 8, 11 | Buffered Output (Y) | 3-state totem-pole output; drives bus lines or memory registers with 9 pF output capacitance and fast edge rates. |
| 7 | GND | Signal reference and return path for all I/O and internal logic; must be connected to system ground plane. |
| 14 | VCC | Positive supply terminal; requires local 0.1 µF ceramic decoupling capacitor placed within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Process Technology | Reduces ICCZ to ≤10 mA while maintaining TTL-speed propagation (≤7 ns), lowering system power in always-on bus interfaces. |
| Power-Up/Down High-Z State | Guarantees outputs remain in high-impedance during VCC ramp-up/down, eliminating bus contention in hot-swap or sequenced-power systems. |
| Independent 3-State Control | Four separate OE inputs allow selective activation of individual buffers-critical for multi-segment address/data bus partitioning. |
| MIL-STD-883 ESD Protection | Exceeds 2000 V HBM, supporting reliable manual handling and PCB rework without ESD-sensitive workstations. |
Applications
| Memory Address Buffering | Legacy Bus Isolation |
|---|---|
Use Scenario: Buffering CPU-generated address signals before routing to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating address lines; enables time-multiplexed access to RAM/ROM banks. Use Value: Prevents signal degradation over long traces and eliminates contention when multiple devices share the same address bus segment. | Use Scenario: Isolating ISA or VMEbus data lines between master and slave peripherals in industrial backplane systems. IC Role / Device Role / Timing Role: Bidirectional bus driver with per-lane enable control; synchronizes data transfer using system-level OE strobes. Use Value: Allows dynamic bus ownership handoff without hardware redesign; supports mixed-voltage subsystem interconnection. |
| Microcontroller I/O Expansion | Industrial Control Logic Interface |
Use Scenario: Expanding GPIO count of an 8-bit microcontroller to drive discrete indicators, relays, or sensor readback lines. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer; translates MCU logic levels to higher-current bus-compatible signals. Use Value: Enables direct connection to 64 mA loads (e.g., LED arrays or optocouplers) without external transistors or drivers. | Use Scenario: Interfacing programmable logic controllers (PLCs) with legacy TTL-based sensor modules and actuator drivers. IC Role / Device Role / Timing Role: Signal conditioner and bus repeater; restores logic integrity across noisy factory-floor wiring runs. Use Value: Maintains noise margins (≥0.4 V) under 64 mA load while surviving –40°C to 85°C ambient extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT244N | Octal (8-channel) version with identical BiCMOS process, 3-state, and 5-V operation; larger package (20-pin DIP). | Supports wider buses; not pin-compatible due to doubled pin count and different pin mapping. | Select when expanding to 8-bit data/address paths without redesigning control logic. |
| SN64BCT125AN | Quad buffer with inverting outputs (A → Y̅); otherwise identical electrical specs, pinout, and thermal performance. | Used where logic inversion is required in the signal path (e.g., active-low enable propagation). | Choose only if system timing or logic polarity mandates inverted output behavior. |
Compared with SN74BCT244N and SN64BCT125AN, the SN64BCT126AN offers optimal channel count and non-inverting functionality for 4-bit segmented bus architectures-reducing component count versus octal alternatives and avoiding unnecessary logic inversion overhead.
Availability
SN64BCT126AN is available at Aetrix Electronics and suitable for industrial control systems, legacy computer upgrades, and embedded instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for SN64BCT126AN 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN64BCT126AN belongs to TI's legacy BiCMOS logic family, engineered specifically for high-reliability 5-V bus interfacing in environments demanding robust power sequencing, ESD resilience, and wide temperature operation.
FAQ
What is the operating voltage range for the SN64BCT126AN?
The SN64BCT126AN operates over a supply voltage range of 4.5 V to 5.5 V, making it compatible with standard 5-V TTL and CMOS logic families. This range accommodates typical power supply tolerances and ensures reliable switching performance across industrial temperature conditions. The device is not rated for 3.3-V operation, and applying voltages outside this window may cause permanent damage or undefined behavior.
Does the SN64BCT126AN support hot insertion or live bus connection?
Yes-the SN64BCT126AN enters a guaranteed high-impedance state during power-up and power-down sequences, preventing bus contention when inserted into a live system. This feature, combined with its >2000 V HBM ESD rating, makes the SN64BCT126AN suitable for controlled hot-swap scenarios in backplane and modular instrumentation designs.
How many independent 3-state buffers does the SN64BCT126AN contain?
The SN64BCT126AN contains four independent non-inverting 3-state buffers, each with its own dedicated output-enable (OE) input. Pins 1, 4, 9, and 12 serve as the four OE terminals, allowing granular control over which channels drive the bus and which remain isolated-essential for flexible memory mapping and peripheral multiplexing.
What is the maximum output sink current for the SN64BCT126AN?
The SN64BCT126AN supports a maximum low-level output current (IOL) of 64 mA per channel, verified under recommended operating conditions (VCC = 4.5 V, TA = –40°C to 85°C). This allows direct driving of multiple TTL inputs or moderate-current loads like LEDs and small relays without external amplification.
Is the SN64BCT126AN pin-compatible with other members of the BCT logic family?
The SN64BCT126AN shares the same 14-pin DIP footprint and pinout as SN64BCT125AN (inverting variant), but is not pin-compatible with octal variants like SN74BCT244N due to differing pin counts and assignments. Always verify OE, input, and output pin mappings against the specific logic function required-substitution without layout review may result in functional failure.
SN64BCT126AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
SN64BCT126AN FAQ
1.How can I place an order for SN64BCT126AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT126AN 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 SN64BCT126AN reliable?
The price and inventory of SN64BCT126AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT126AN is usually 5 days.
3.What payment methods are accepted for SN64BCT126AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT126AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT126AN?
SN64BCT126AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT126AN 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 SN64BCT126AN?
For technical support, including SN64BCT126AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT126AN requirements.
6.How does Aetrix verify that SN64BCT126AN is sourced from the original manufacturer or authorized distributors?
All SN64BCT126AN 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 SN64BCT126AN meets industry standards.
7.What is the process for return or replacement of SN64BCT126AN?
All SN64BCT126AN units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT126AN, 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 SN64BCT126AN part is unused and in its original packaging.
Return procedure for SN64BCT126AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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