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Texas Instruments SN64BCT126AD
- Part No.:
- SN64BCT126AD
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN64BCT126AD.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:236
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Product details
Overview
SN64BCT126AD from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for bidirectional data bus isolation and address register buffering in 5-V TTL/CMOS mixed-signal systems. It operates from –40°C to 85°C, supports 64 mA low-level output drive, exhibits 3.6 ns typical tPLH propagation delay, and features high-impedance state during power-up/down.
For engineers reviewing the SN64BCT126AD datasheet, SN64BCT126AD pinout, SN64BCT126AD application, or SN64BCT126AD equivalent, key selection criteria include 3-state control timing (tPZL ≤ 10.5 ns), ICCZ quiescent current (≤10 mA), bus-drive capability (IOL = 64 mA), and SOIC-14 package compatibility with legacy DIP-based layouts.
Technical Context
This BiCMOS bus buffer implements four independent non-inverting buffers, each with dedicated active-low output-enable (OE) control. Each channel transitions between low-impedance drive (VOH ≥ 2.4 V at IOH = –3 mA; VOL ≤ 0.55 V at IOL = 64 mA) and high-impedance state (IOZL/IOZH ≤ ±50 µA).
It integrates ESD protection exceeding 2000 V per MIL-STD-883 Method 3015 and maintains high-impedance outputs during VCC ramp-up/down. The device is not compatible with 3.3-V logic families without level translation due to VIH = 2.0 V minimum and VIL = 0.8 V maximum under 5-V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Requires regulated 5-V supply; not 3.3-V tolerant. |
| IOL / IOH | 64 mA / –15 mA - Drives standard TTL loads; supports fan-out of ≥20 LS-TTL inputs. |
| tPLH / tPHL | 1.5–6.3 ns - Enables high-speed bus arbitration in memory-mapped peripherals up to ~150 MHz effective toggle rate. |
| ICCZ Quiescent Current | 5–10 mA - Significantly lower than bipolar-only equivalents, reducing system standby power. |
| IOZL / IOZH | ±50 µA - Ensures minimal leakage into disabled bus segments, critical for multi-master arbitration integrity. |
| Operating Temperature | –40°C to 85°C - Qualified for industrial-grade embedded control and instrumentation environments. |
Pinout & Package
SN64BCT126AD is housed in a 14-pin SOIC (D package), 3.90 mm wide, with standard 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot; pin numbering follows JEDEC MS-012.
| 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; must be tied to VCC or GND if unused. |
| 2, 5, 10, 13 | A (Input) | Non-inverting data input; VIH = 2.0 V min ensures reliable TTL-level recognition. |
| 3, 6, 8, 11 | Y (Output) | 3-state totem-pole output; capable of sinking 64 mA while maintaining VOL ≤ 0.55 V. |
| 7 | GND | Ground reference for all logic and output stages; requires low-inductance connection to minimize switching noise. |
| 14 | VCC | Positive supply; decoupling capacitor (0.1 µF ceramic) required adjacent to pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| State-of-the-art BiCMOS design | Combines bipolar speed with CMOS input impedance and reduced ICCZ versus pure bipolar buffers. |
| High-impedance during power sequencing | Prevents bus contention on power-up/down - no external reset coordination needed for OE lines. |
| ESD protection >2000 V | Meets MIL-STD-883 Method 3015 - enables handling in non-ESD-controlled assembly environments. |
| Independent 3-state control per channel | Enables selective bus segment isolation without gating entire data paths - critical for modular backplane designs. |
| Low input capacitance (Ci = 4 pF) | Minimizes loading on upstream drivers - preserves signal integrity in high-fanout address buses. |
Applications
| Industrial PLC Backplanes | Legacy Memory Address Buffers |
|---|---|
|
Use Scenario: Isolating CPU address lines from multiple peripheral modules sharing a common bus in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional address bus buffer with per-module 3-state control, enabling hot-swap-capable slot addressing. Use Value: Prevents address-line contention during module insertion/removal; tPZL ≤ 10.5 ns ensures fast bus reacquisition after enable assertion. |
Use Scenario: Driving 16-bit address registers in 80C88/80C86-based embedded controllers where address decoding must remain stable across power cycles. IC Role / Device Role / Timing Role: Non-inverting buffer with guaranteed high-Z during VCC ramp - eliminates address glitches at boot. Use Value: Eliminates need for external power-on reset synchronization of OE lines; reduces BOM count by one RC network per channel. |
| Test Equipment Bus Interfaces | Automated Test Fixture Controllers |
|
Use Scenario: Interfacing microcontroller GPIOs to high-capacitance test bus lines (≥50 pF) requiring robust drive strength and clean disable transitions. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer between 5-V MCU ports and legacy instrumentation buses. Use Value: 64 mA sink capability drives heavy capacitive loads without waveform degradation; IOZL ≤ 50 µA prevents false triggering on floating bus segments. |
Use Scenario: Controlling parallel I/O expansion cards in automated functional test systems where multiple boards share a common control bus. IC Role / Device Role / Timing Role: Selective bus segment enable/disable gate for synchronized test pattern delivery across distributed fixtures. Use Value: Independent OE pins allow staggered activation of fixture sub-systems - avoids simultaneous inrush current spikes exceeding PSU limits. |
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. quadruple (4-channel); identical SOIC-20 vs. SOIC-14 footprint; same BiCMOS process and 5-V specs. | Higher channel density suits wider data buses; requires PCB redesign due to larger package and pin count. | Select SN74BCT244N when expanding from 4- to 8-bit bus width without changing logic family or timing behavior. |
| SN64BCT125AD | Identical pinout and package; differs only in output polarity - SN64BCT125AD has inverting outputs (Y = A̅), while SN64BCT126AD is non-inverting (Y = A). | Used where bus inversion is required for signal conditioning or phase alignment in feedback paths. | Choose SN64BCT125AD only when inverting logic is explicitly needed; otherwise SN64BCT126AD is direct functional match. |
Compared with SN74BCT244N and SN64BCT125AD, the SN64BCT126AD provides optimal channel count and non-inverting logic for compact 4-bit address/data isolation, avoiding unnecessary pin count increase or unintended signal inversion in fixed-function control paths.
Availability
SN64BCT126AD is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy memory address buffering, and automated test fixture controllers requiring stable component supply across extended product lifecycles.
Supply support for SN64BCT126AD 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 50 years of innovation in industrial and automotive electronics.
The SN64BCT126AD belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered for high-speed, low-power 5-V bus interfacing in industrial control, instrumentation, and legacy computing systems.
FAQ
What is the operating temperature range for the SN64BCT126AD?
The SN64BCT126AD is characterized for operation from –40°C to 85°C, meeting industrial-grade environmental requirements. This range is validated per the recommended operating conditions table in the official SCBS051C datasheet, and applies specifically to the SN64BCT126AD in SOIC-D packaging.
Does the SN64BCT126AD support 3.3-V input logic levels?
No, the SN64BCT126AD does not reliably accept 3.3-V logic inputs. Its VIH minimum is 2.0 V at VCC = 4.5 V, and VIL maximum is 0.8 V - margins are insufficient for guaranteed recognition of 3.3-V CMOS thresholds. Level translation is required when interfacing with 3.3-V controllers.
What is the maximum output current the SN64BCT126AD can sink per channel?
The SN64BCT126AD can sink up to 64 mA per output channel while maintaining VOL ≤ 0.55 V at VCC = 4.5 V, as specified in the electrical characteristics table. This rating supports direct driving of multiple LS-TTL inputs or moderate capacitive bus loads without external amplification.
Is the SN64BCT126AD pin-compatible with the SN64BCT125AD?
Yes, the SN64BCT126AD is pin-compatible with the SN64BCT125AD - both use identical SOIC-14 (D) packaging and share identical pin assignments for VCC, GND, A, Y, and OE terminals. The sole functional difference is output polarity: SN64BCT126AD is non-inverting, while SN64BCT125AD is inverting.
What package type is used for the SN64BCT126AD?
The SN64BCT126AD uses a 14-pin SOIC (Small-Outline Integrated Circuit) package designated as "D" per TI's packaging nomenclature. Its dimensions are 8.65 mm × 3.90 mm × 1.75 mm, with 1.27 mm lead pitch and RoHS-compliant NiPdAu finish.
SN64BCT126AD 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
SN64BCT126AD FAQ
1.How can I place an order for SN64BCT126AD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT126AD 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 SN64BCT126AD reliable?
The price and inventory of SN64BCT126AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT126AD is usually 5 days.
3.What payment methods are accepted for SN64BCT126AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT126AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT126AD?
SN64BCT126AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT126AD 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 SN64BCT126AD?
For technical support, including SN64BCT126AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT126AD requirements.
6.How does Aetrix verify that SN64BCT126AD is sourced from the original manufacturer or authorized distributors?
All SN64BCT126AD 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 SN64BCT126AD meets industry standards.
7.What is the process for return or replacement of SN64BCT126AD?
All SN64BCT126AD units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT126AD, 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 SN64BCT126AD part is unused and in its original packaging.
Return procedure for SN64BCT126AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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