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Texas Instruments SN64BCT126ADR
- Part No.:
- SN64BCT126ADR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN64BCT126ADR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
SN64BCT126ADR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for bidirectional data bus isolation and address register buffering in 5-V TTL/CMOS mixed-signal systems. It features four independent non-inverting buffers, each with active-low output-enable control, 64-mA low-level output drive, 10-mA high-level output drive, and guaranteed operation from –40°C to 85°C.
For engineers reviewing the SN64BCT126ADR datasheet, SN64BCT126ADR pinout, SN64BCT126ADR application, or SN64BCT126ADR equivalent, key selection criteria include 3-state bus contention avoidance, BiCMOS power efficiency (ICCZ ≤ 10 mA), thermal performance (θJA = 127°C/W in SOIC), and compatibility with legacy 5-V TTL logic families.
Technical Context
The SN64BCT126ADR implements four independent non-inverting buffer stages, each controlled by a dedicated active-low output-enable (OE) input. Its BiCMOS architecture combines bipolar input stages for TTL-compatible thresholds (VIH = 2 V, VIL = 0.8 V) with CMOS output stages enabling high-current sinking (IOL = 64 mA) and sourcing (IOH = –15 mA at VOH ≥ 2.4 V).
Each output transitions to high-impedance state during power-up and power-down, preventing bus contention. The device supports 50-pF load-driven propagation delays of tPLH ≤ 4.9 ns and tPHL ≤ 6.9 ns at VCC = 5 V, with enable/disable times (tPZH/tPLZ) under 8.2 ns - optimized for synchronous bus arbitration in memory and peripheral interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across industrial 5-V rail tolerances. |
| IOL / IOH | 64 mA / –15 mA - drives standard TTL loads and interfaces directly with 74-series logic without external pull-ups. |
| tPLH / tPHL | ≤ 4.9 ns / ≤ 6.9 ns - enables reliable timing in 100+ MHz bus cycles with 50-pF loading. |
| ICCZ | ≤ 10 mA - low quiescent current in 3-state mode reduces system standby power. |
| ESD Rating | > 2000 V HBM - meets MIL-STD-883 Method 3015 for robust handling in assembly environments. |
| Operating Temp | –40°C to 85°C - qualified for extended-temperature industrial and automotive under-hood applications. |
| Input Capacitance | 4 pF - minimizes loading on upstream drivers and preserves signal integrity in fan-out-critical paths. |
Pinout & Package
SN64BCT126ADR is packaged in a 14-pin SOIC (D package), 3.90 mm wide, RoHS-compliant, with moisture sensitivity level (MSL) Level-1 (260°C peak reflow). Pin 1 is marked with a beveled corner or dot; the device uses standard dual-inline pinout orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Output Enable (1OE, 2OE, 3OE, 4OE) | Active-low control per buffer - asserts high-impedance output when logic low; tied high for always-enabled operation. |
| 2, 5, 10, 13 | Input (1A, 2A, 3A, 4A) | Non-inverting data input - accepts TTL-compatible voltage levels (VIH ≥ 2 V, VIL ≤ 0.8 V). |
| 3, 6, 8, 11 | Output (1Y, 2Y, 3Y, 4Y) | 3-state buffered output - sinks up to 64 mA or sources up to 15 mA; high-Z when OE is low. |
| 7 | GND | Ground reference for all logic and output stages - must be low-impedance connection to minimize noise coupling. |
| 14 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required within 10 mm of this pin for switching stability. |
Key Features
| Feature | Design Value |
|---|---|
| State-of-the-art BiCMOS design | Combines TTL input compatibility with CMOS output drive strength and low ICCZ - eliminates need for external level shifters or buffers. |
| High-impedance during power sequencing | Outputs remain in Hi-Z from power-up through full VCC ramp - prevents bus contention and latch-up in hot-plug or multi-rail systems. |
| ESD protection > 2000 V | Meets MIL-STD-883 Method 3015 - allows safe manual handling and board-level assembly without special ESD controls. |
| Independent 3-state control per channel | Enables selective bus partitioning - e.g., isolate memory address lines while keeping data lines active, reducing routing complexity. |
| Low input capacitance (4 pF) | Minimizes capacitive loading on upstream drivers - critical for maintaining setup/hold margins in high-fanout address buses. |
Applications
| Memory Address Buffering | Microprocessor Bus Isolation |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM/ROM chips in a shared-memory architecture. IC Role / Device Role / Timing Role: Non-inverting buffer with per-line 3-state control - isolates inactive memory banks and prevents address bus contention. Use Value: Enables dynamic bank selection using OE signals synchronized with chip-select strobes, eliminating need for discrete gating logic. |
Use Scenario: Interfacing an 8-bit microcontroller data bus to multiple peripherals (ADC, UART, GPIO expander) sharing the same bus lines. IC Role / Device Role / Timing Role: Bidirectional bus buffer - provides direction-controlled isolation between master and slave devices during read/write cycles. Use Value: Prevents signal corruption during simultaneous access attempts by enforcing strict 3-state arbitration via hardware OE timing. |
| Legacy System Logic Interface | Industrial Control Backplane Driver |
|
Use Scenario: Bridging modern FPGA I/O (3.3-V LVTTL) to legacy 5-V TTL peripherals in retrofitted automation equipment. IC Role / Device Role / Timing Role: Level-tolerant buffer - accepts 3.3-V inputs while driving 5-V TTL loads with full current compliance. Use Value: Eliminates need for discrete level-shifter ICs or resistor-based solutions, reducing BOM count and layout area. |
Use Scenario: Driving long parallel control lines (e.g., 12-bit DAC address, 8-bit status flags) across a 20-cm backplane in PLC modules. IC Role / Device Role / Timing Role: High-drive bus repeater - compensates for trace capacitance and noise margin loss over extended runs. Use Value: Delivers 64-mA sink capability to maintain VOL ≤ 0.55 V even with 100-pF distributed load - ensures noise-immune logic thresholds. |
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 in 20-pin PDIP; higher pin count and larger footprint; identical electrical specs (VCC, IOL, tPLH, ICCZ). | Used where higher channel density is needed without increasing IC count - requires PCB redesign due to different pinout and package. | Select SN74BCT244N only when octal buffering is required and SOIC-14 layout cannot accommodate two SN64BCT126ADR units. |
| SN64BCT125ADR | Inverting buffer variant (Y = NOT A); otherwise identical pinout, timing, drive strength, and temperature range. | Required in designs needing polarity inversion (e.g., active-low enable translation or complemented bus signaling). | Choose SN64BCT125ADR when signal inversion is part of the bus protocol - no change to PCB layout or power delivery. |
Compared with SN74BCT244N and SN64BCT125ADR, the SN64BCT126ADR offers optimal channel count-to-area ratio for quad non-inverting buffering, avoids unnecessary inversion logic, and fits compact SOIC layouts without sacrificing drive or timing performance.
Availability
SN64BCT126ADR is available at Aetrix Electronics and suitable for memory subsystem design, microprocessor bus expansion, industrial backplane interfacing, and legacy TTL system upgrades requiring stable component supply and long-term manufacturability.
Supply support for SN64BCT126ADR 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN64BCT126ADR belongs to TI's BCT family of BiCMOS bus transceivers - engineered specifically for high-speed, low-power 5-V TTL-compatible interfacing in mixed-technology digital systems.
FAQ
What is the maximum output current rating for SN64BCT126ADR?
The SN64BCT126ADR supports a maximum low-level output current (IOL) of 64 mA per channel and a high-level output current (IOH) of –15 mA, measured at VOH ≥ 2.4 V with VCC = 4.5 V. These ratings ensure direct interface with standard TTL loads without external current-boosting circuitry.
Does SN64BCT126ADR support hot insertion or live bus connection?
Yes - the SN64BCT126ADR enters high-impedance state during power-up and power-down sequences, preventing bus contention when inserted into a live system. This behavior is inherent to its BiCMOS design and does not require external control sequencing.
Can SN64BCT126ADR operate reliably at 3.3-V supply?
No - the SN64BCT126ADR is specified only for VCC = 4.5 V to 5.5 V. Operation below 4.5 V violates recommended conditions and may result in undefined logic thresholds, reduced noise margin, or failure to meet tPLH/tPHL timing guarantees.
What is the thermal resistance (θJA) of SN64BCT126ADR in its SOIC package?
The SN64BCT126ADR in the D-package (SOIC-14) has a junction-to-ambient thermal resistance (θJA) of 127°C/W, measured per JESD 51 standards. This value assumes standard JEDEC 2-layer board layout with 1-in² copper pour under the package.
How does SN64BCT126ADR handle unused inputs?
All unused inputs on the SN64BCT126ADR must be tied to either VCC or GND to prevent floating nodes that could cause excessive ICC or erratic switching. TI recommends tying unused OE inputs to VCC (to disable outputs) and unused A inputs to GND (to avoid unintended toggling).
SN64BCT126ADR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN64BCT126ADR FAQ
1.How can I place an order for SN64BCT126ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT126ADR 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 SN64BCT126ADR reliable?
The price and inventory of SN64BCT126ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT126ADR is usually 5 days.
3.What payment methods are accepted for SN64BCT126ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT126ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT126ADR?
SN64BCT126ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT126ADR 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 SN64BCT126ADR?
For technical support, including SN64BCT126ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT126ADR requirements.
6.How does Aetrix verify that SN64BCT126ADR is sourced from the original manufacturer or authorized distributors?
All SN64BCT126ADR 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 SN64BCT126ADR meets industry standards.
7.What is the process for return or replacement of SN64BCT126ADR?
All SN64BCT126ADR units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT126ADR, 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 SN64BCT126ADR part is unused and in its original packaging.
Return procedure for SN64BCT126ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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