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Texas Instruments SN64BCT126ANSR
- Part No.:
- SN64BCT126ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN64BCT126ANSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,588
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Product details
Overview
SN64BCT126ANSR from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for bidirectional data bus isolation and memory address buffering in 5-V TTL/CMOS systems. It features 4-channel non-inverting logic, ±64 mA output drive, 3.6 ns typical propagation delay (A→Y), and high-impedance state during power-up/down. Used in industrial control backplanes and legacy microprocessor address latching.
For engineers reviewing the SN64BCT126ANSR datasheet, SN64BCT126ANSR pinout, SN64BCT126ANSR application, or SN64BCT126ANSR equivalent, key selection criteria include 3-state enable timing (tPZL = 3.7 ns min), ICCZ quiescent current (5–10 mA), thermal performance (θJA = 78°C/W in NS package), and compatibility with 5-V bus loading requirements.
Technical Context
This BiCMOS bus buffer implements four independent non-inverting drivers, each controlled by a dedicated active-low output-enable (OE) input. Each channel transitions to high-impedance when its OE is low, enabling dynamic bus sharing without contention.
It operates across –40°C to 85°C at VCC = 4.5–5.5 V, supports 50-pF capacitive loads, and meets MIL-STD-883 ESD protection (>2000 V). Its low ICCZ and fast disable times (tPHZ/tPLZ ≤ 8.2 ns max) reduce system-level power noise during state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures robust operation under 5-V rail tolerance and brownout conditions. |
| Output Drive | ±64 mA - Sufficient to drive 50-pF bus loads with <7 ns propagation delay and <8.3 ns disable time. |
| tPLH / tPHL | 1.5–6.3 ns - Enables reliable timing in 100+ MHz address/data strobe applications. |
| ICCZ Quiescent Current | 5–10 mA - Low standby power vs. bipolar-only buffers, critical for multi-buffer systems. |
| ESD Rating | >2000 V HBM - Meets MIL-STD-883 Method 3015, supporting handling in non-EPA environments. |
| Operating Temp | –40°C to 85°C - Qualified for industrial temperature range without derating. |
| Input Clamp Current | –18 mA - Allows safe overvoltage transient absorption on inputs up to 7 V. |
Pinout & Package
SN64BCT126ANSR uses a 14-pin plastic small-outline (SO) package with NS drawing, 300-mil width, and RoHS-compliant NiPdAu finish. Pin 1 is located in Quadrant Q1 per JEDEC standard tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | OE (Active-Low Output Enable) | Independent per-channel enable; low = output enabled, high = high-Z state. |
| 2, 5, 10, 13 | A (Input) | Non-inverting data input for corresponding buffer channel. |
| 3, 6, 8, 11 | Y (Output) | 3-state buffered output; follows A when OE low, high-Z when OE high. |
| 7 | GND | Ground reference for all logic and output stages; must be low-impedance. |
| 14 | VCC | 5-V supply for BiCMOS output drivers and input buffers; bypassing required. |
Key Features
| Feature | Design Value |
|---|---|
| State-of-the-art BiCMOS design | Combines bipolar speed and CMOS input impedance for 3.6 ns typical tPLH at 50-pF load. |
| High-impedance during power sequencing | Outputs remain in high-Z from VCC = 0 to 1.3 V (power-up) and 1.3 V to 0 V (power-down), preventing bus contention. |
| Low ICCZ quiescent current | 5–10 mA at VCC = 5.5 V - Reduces system-level power supply ripple vs. legacy TTL buffers. |
| MIL-STD-883 ESD protection | Exceeds 2000 V HBM - Eliminates need for external TVS diodes in board-level ESD zones. |
| Independent 3-state control | Four separate OE inputs allow selective channel gating - essential for partial bus arbitration in multiprocessor systems. |
Applications
| Microprocessor Address Latching | Industrial Backplane Bus Isolation |
|---|---|
|
Use Scenario: Buffering 16-bit address bus between CPU and peripheral decoders in PLC mainframes. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing clean, contention-free address propagation with synchronized OE control. Use Value: Enables hot-swap of I/O modules without CPU reset via independent OE gating and power-cycle-safe high-Z state. |
Use Scenario: Isolating shared data bus among multiple CAN controllers and analog I/O cards in factory automation racks. IC Role / Device Role / Timing Role: Bidirectional bus driver with per-channel OE, allowing dynamic master/slave arbitration. Use Value: Prevents signal corruption during card insertion/removal using tPZL ≤ 3.7 ns disable timing and >2000 V HBM ESD rating. |
| Legacy Memory Interface Expansion | Test Equipment Signal Conditioning |
|
Use Scenario: Expanding 8-bit EPROM address space in vintage instrumentation firmware loaders. IC Role / Device Role / Timing Role: Address register buffer driving 50-pF PCB traces to multiple ROM chips. Use Value: Delivers 64 mA sink/source to meet TTL fanout requirements while maintaining tPHL ≤ 5.3 ns max across –40°C to 85°C. |
Use Scenario: Level-shifting and bus-driving signals between FPGA-based pattern generators and DUT interface connectors. IC Role / Device Role / Timing Role: 3-state output buffer isolating test vectors from DUT power domains during initialization. Use Value: Guarantees high-Z during FPGA configuration (VCC ramp) via built-in power-sequence immunity, eliminating external reset sequencing. |
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) vs. quad (4-channel); identical VCC range, timing, and BiCMOS process. | Higher channel density suits wider buses (e.g., 32-bit data paths); requires larger PCB footprint. | Choose SN74BCT244N when expanding to 8-line buffering without redesigning enable logic. |
| SN64BCT125ANSR | Inverting output logic (A→¬Y) vs. non-inverting (A→Y); otherwise identical pinout, specs, and package. | Requires logic inversion in upstream signal path; unsuitable where polarity must be preserved. | Choose SN64BCT125ANSR only if system-level timing budget allows inversion or downstream logic compensates. |
Compared with SN74BCT244N and SN64BCT125ANSR, the SN64BCT126ANSR provides optimal channel count and signal polarity for 4-line address/data isolation in space-constrained industrial controllers, with no layout change needed when replacing legacy SN74LS126 variants.
Availability
SN64BCT126ANSR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy memory interface expansion, and test equipment signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SN64BCT126ANSR 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 SN64BCT126ANSR belongs to TI's BCT family of BiCMOS bus transceivers, engineered for high-speed, low-noise 5-V bus interfacing in mission-critical industrial systems where reliability across temperature extremes is mandatory.
FAQ
What is the operating temperature range for the SN64BCT126ANSR?
The SN64BCT126ANSR is characterized for operation from –40°C to 85°C, meeting industrial temperature requirements without derating. This range is validated per the SCBS051C datasheet revision and confirmed in TI's Package Option Addendum, making SN64BCT126ANSR suitable for deployment in harsh environments such as factory floor controllers and outdoor telemetry units.
Does the SN64BCT126ANSR support 3.3-V logic inputs?
No, the SN64BCT126ANSR is a 5-V-only device with VIH = 2.0 V minimum and VIL = 0.8 V maximum, specified for TTL-compatible inputs. Driving it directly from 3.3-V logic risks marginal high-level recognition and is not supported per recommended operating conditions; level-shifting circuitry is required for mixed-voltage systems using SN64BCT126ANSR.
What is the thermal resistance (θJA) of the SN64BCT126ANSR in its NS package?
The SN64BCT126ANSR in the NS (14-pin SO) package has a thermal resistance θJA of 78°C/W, as specified in the absolute maximum ratings table of the SCBS051C datasheet. This value assumes standard JEDEC 2-layer board conditions and enables thermal design margin calculation for continuous 64 mA output loading at full industrial temperature range.
Can unused inputs on the SN64BCT126ANSR be left floating?
No - all unused inputs of the SN64BCT126ANSR must be held at VCC or GND to ensure proper device operation, as explicitly stated in Note 3 of the recommended operating conditions. Floating OE or A inputs may cause erratic 3-state behavior or increased ICC, risking bus contention; TI recommends tying unused OE pins to VCC (disable) and unused A pins to GND or VCC depending on desired default state.
Is the SN64BCT126ANSR pin-compatible with the SN74LS126N?
No - although both are quad 3-state buffers, the SN64BCT126ANSR (BiCMOS) and SN74LS126N (bipolar TTL) share functional equivalence but differ electrically and thermally. The SN64BCT126ANSR offers lower ICCZ, faster timing, and higher ESD tolerance, but pinout matches only within the BCT family (e.g., SN64BCT125ANSR), not LS-series devices. Direct replacement requires validation of timing margins and drive strength in the target SN64BCT126ANSR application.
SN64BCT126ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SO
SN64BCT126ANSR FAQ
1.How can I place an order for SN64BCT126ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT126ANSR 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 SN64BCT126ANSR reliable?
The price and inventory of SN64BCT126ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT126ANSR is usually 5 days.
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SN64BCT126ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT126ANSR 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 SN64BCT126ANSR?
For technical support, including SN64BCT126ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT126ANSR requirements.
6.How does Aetrix verify that SN64BCT126ANSR is sourced from the original manufacturer or authorized distributors?
All SN64BCT126ANSR 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 SN64BCT126ANSR meets industry standards.
7.What is the process for return or replacement of SN64BCT126ANSR?
All SN64BCT126ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT126ANSR, 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 SN64BCT126ANSR part is unused and in its original packaging.
Return procedure for SN64BCT126ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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