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Texas Instruments SN74BCT126ANSR
- Part No.:
- SN74BCT126ANSR
- Manufacturer:
- Texas Instruments
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- -
- Datasheet:
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SN74BCT126ANSR.pdf
- Description:
- BUFFER/LINE DRIVER 4-CH NON-INVE
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Product details
Overview
SN74BCT126ANSR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for bidirectional data bus isolation and memory address register buffering in TTL-compatible 5-V systems. It features independent line drivers, 3-state control per channel via dedicated OE inputs, 128 mA low-level output drive, and operates from 0°C to 70°C.
For engineers reviewing the SN74BCT126ANSR datasheet, SN74BCT126ANSR pinout, SN74BCT126ANSR application, or SN74BCT126ANSR equivalent, key selection criteria include 3-state timing (tPZL = 10 ns max), BiCMOS power efficiency (ICCZ = 10 mA max), output drive capability (IOL = 64 mA), and PDIP-14 package compatibility with legacy board layouts.
Technical Context
The SN74BCT126ANSR implements four independent non-inverting buffers, each with a dedicated active-high output-enable (OE) input controlling high-impedance state entry/exit. Its BiCMOS architecture combines bipolar input stages for TTL-level compatibility and CMOS output stages for reduced ICCZ quiescent current.
Each channel supports rail-to-rail output swing (VOH ≥ 2.0 V at IOH = –15 mA; VOL ≤ 0.55 V at IOL = 64 mA) and withstands input/output voltages up to 7 V, enabling safe hot-insertion and mixed-voltage interface handling within 5-V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Ensures stable operation across industrial 5-V rail tolerances. |
| Output Drive (IOL) | 64 mA - Supports direct driving of multiple TTL loads or terminated transmission lines. |
| 3-State Turn-Off Delay (tPZL) | 10 ns max - Enables fast bus release for time-critical multiplexing applications. |
| Input Threshold (VIL/VIL) | 0.8 V / 2.0 V - Matches standard TTL logic levels for seamless integration. |
| Quiescent Current (ICCZ) | 10 mA max - Minimizes standby power in multi-buffer configurations. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded and computing systems. |
| ESD Rating | >2000 V HBM - Provides robust handling during PCB assembly and field service. |
Pinout & Package
SN74BCT126ANSR is supplied in a 14-pin plastic dual-inline package (PDIP), designated N package per TI documentation. Pin spacing is 0.300 inch (7.62 mm), with standard DIP footprint compatible with through-hole assembly and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (OE) | Active-high control per buffer; drives corresponding Y output to high-Z when low. |
| 2, 5, 11, 14 | Input (A) | Non-inverting data input for each of four independent buffer channels. |
| 3, 6, 12, 9 | Output (Y) | 3-state buffered output; follows A when OE is high, high-Z when OE is low. |
| 7 | GND | Ground reference for all logic and output stages. |
| 14 | VCC | +5 V supply for BiCMOS internal circuitry and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| State-of-the-art BiCMOS design | Reduces ICCZ quiescent current by >50% vs. pure bipolar equivalents, lowering system power in idle bus states. |
| Independent 3-state control per channel | Enables selective bus segmentation without gating logic-each buffer isolated via its own OE signal. |
| TTL-compatible input thresholds | Accepts standard 0.8 V / 2.0 V logic levels, eliminating level-shifting in legacy 5-V backplanes and controllers. |
| High-current 3-state outputs | Delivers 64 mA sink current to drive heavy capacitive loads (e.g., long traces, multiple TTL inputs) while maintaining VOL ≤ 0.55 V. |
| ESD protection >2000 V | Meets MIL-STD-883C Method 3015, reducing field failure risk during handling and system integration. |
Applications
| Memory Address Buffering | Legacy Bus Isolation |
|---|---|
Use Scenario: Buffering CPU-generated address signals to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: SN74BCT126ANSR acts as a unidirectional address driver, isolating the microprocessor from address bus capacitance and fanout loading. Use Value: Prevents address skew and timing violations by delivering clean, high-drive signals with tPLH ≤ 6.3 ns and tPHL ≤ 7.4 ns. | Use Scenario: Isolating two legacy 5-V subsystems (e.g., ISA bus segments) to prevent contention during hot-swap or partial power-down. IC Role / Device Role / Timing Role: SN74BCT126ANSR serves as a controlled-directional bus gate, enabled only when both sides are powered and synchronized. Use Value: Eliminates bus contention faults using fast 3-state turn-off (tPZL ≤ 10 ns) and high-impedance leakage < 50 µA. |
| Data Bus Multiplexing | Peripheral Interface Expansion |
Use Scenario: Time-multiplexing shared data lines between a microcontroller and multiple peripherals (ADC, DAC, EEPROM). IC Role / Device Role / Timing Role: SN74BCT126ANSR functions as a channel-selectable data path controller, enabling/disabling data flow per peripheral via discrete OE lines. Use Value: Achieves deterministic bus arbitration with guaranteed 3-state isolation (IOZL/IOZH ≤ ±50 µA) and no DC path between disabled devices. | Use Scenario: Expanding GPIO count on an 8-bit microcontroller by adding parallel I/O ports via address-decoded latch control. IC Role / Device Role / Timing Role: SN74BCT126ANSR buffers latched output data to external peripherals, ensuring signal integrity across PCB traces up to 15 cm. Use Value: Maintains logic margins under load with VOL ≤ 0.55 V at 64 mA and VIH/VIL aligned to TTL standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS126N | Lower output drive (IOL = 24 mA), higher ICCZ (22 mA), TTL-only process - no BiCMOS power advantage. | Suitable only for light-load, low-speed (< 25 MHz) bus extensions where power is not constrained. | Select SN74LS126N only if legacy LS logic family compatibility is mandatory and drive requirements are minimal. |
| SN74ACT126N | CMOS-based, wider VCC range (4.5–5.5 V), lower ICCZ (4 mA), but lower noise immunity (VIH = 2.0 V min, same as BCT). | Better for mixed-logic systems requiring low static power; less tolerant of noisy 5-V rails than BCT's bipolar input stage. | Choose SN74ACT126N when minimizing quiescent current is critical and board-level noise is well-controlled. |
Compared with SN74LS126N and SN74ACT126N, the SN74BCT126ANSR uniquely balances TTL-level robustness, 64 mA drive, and BiCMOS efficiency-making it optimal for legacy-compliant, medium-fanout bus interfaces where reliability and timing margin are prioritized over ultra-low power.
Availability
SN74BCT126ANSR is available at Aetrix Electronics and suitable for memory address buffering, legacy bus isolation, and data bus multiplexing requiring stable component supply, long-term obsolescence management, and RoHS-compliant through-hole packaging.
Supply support for SN74BCT126ANSR 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 SN74BCT126ANSR belongs to TI's legacy BCT logic family, engineered specifically for high-drive, 3-state bus interfacing in 5-V TTL environments-prioritizing noise immunity, timing predictability, and backward compatibility over ultra-low power.
FAQ
What is the maximum operating temperature range for the SN74BCT126ANSR?
The SN74BCT126ANSR is characterized for operation from 0°C to 70°C, meeting commercial-grade specifications. This range is explicitly defined in TI's SCBS252A datasheet and applies to the N-package variant. Operation outside this range may result in parametric degradation or functional failure, and is not guaranteed by TI's warranty or characterization data.
Does the SN74BCT126ANSR support hot-swapping or live insertion?
The SN74BCT126ANSR supports safe hot-insertion due to its absolute maximum ratings: inputs and outputs tolerate –0.5 V to 7 V, and outputs in high-Z state withstand –0.5 V to 5.5 V. However, proper power sequencing (VCC applied before signals) and current limiting are required-TI does not guarantee fault-free hot-swap without external protection circuitry.
Can the SN74BCT126ANSR drive multiple TTL loads directly?
Yes-the SN74BCT126ANSR delivers 64 mA sink current per output, sufficient to drive up to 20 standard TTL unit loads (each ~3 mA) while maintaining VOL ≤ 0.55 V. This capability is verified under recommended conditions (VCC = 4.5 V, IOL = 64 mA) and enables direct connection to legacy TTL buses without intermediate buffers.
Is the SN74BCT126ANSR RoHS compliant?
Yes-TI's packaging addendum confirms SN74BCT126AN (N-package) is RoHS-compliant. The SN74BCT126ANSR variant carries the same environmental qualification, with lead-free finish and compliance to EU Directive 2011/65/EU. Full material declarations and test reports are available via TI's product content portal.
How does the BiCMOS design of the SN74BCT126ANSR improve performance versus standard TTL buffers?
The BiCMOS architecture in the SN74BCT126ANSR reduces ICCZ quiescent current to 10 mA max-less than half that of equivalent bipolar TTL buffers-while retaining TTL input thresholds and 64 mA output drive. This lowers system power in idle or high-Z states without sacrificing noise immunity or speed, a key advantage in dense, multi-buffered designs.
SN74BCT126ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
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SN74BCT126ANSR FAQ
1.How can I place an order for SN74BCT126ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT126ANSR 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 SN74BCT126ANSR reliable?
The price and inventory of SN74BCT126ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT126ANSR is usually 5 days.
3.What payment methods are accepted for SN74BCT126ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT126ANSR transactions.
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4.How is shipping managed for SN74BCT126ANSR?
SN74BCT126ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT126ANSR 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 SN74BCT126ANSR?
For technical support, including SN74BCT126ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT126ANSR requirements.
6.How does Aetrix verify that SN74BCT126ANSR is sourced from the original manufacturer or authorized distributors?
All SN74BCT126ANSR 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 SN74BCT126ANSR meets industry standards.
7.What is the process for return or replacement of SN74BCT126ANSR?
All SN74BCT126ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT126ANSR, 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 SN74BCT126ANSR part is unused and in its original packaging.
Return procedure for SN74BCT126ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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