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Texas Instruments SN74ABT126NS
- Part No.:
- SN74ABT126NS
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT126NS.pdf
- Description:
- BUS BUFFER 3ST QUAD 14SO
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Product details
Overview
SN74ABT126NS from Fairchild Semiconductor is a quad non-inverting buffer IC with 3-STATE outputs, designed for bus interface and signal isolation in 5V TTL-compatible digital systems. It delivers 32mA output source drive and 64mA sink capability, supports –40°C to +85°C operation, and features glitch-free high-impedance control during power-up/down cycles - used in backplane data routing and memory address buffering.
For engineers reviewing the SN74ABT126NS datasheet, SN74ABT126NS pinout, SN74ABT126NS application, or SN74ABT126NS equivalent, key selection criteria include guaranteed latchup protection, sub-7ns enable/disable timing asymmetry (tPZH > tPHZ), hot-insertion tolerance, and JEDEC MS-012 SOIC-14 lead-free compliance per J-STD-020B.
Technical Context
The SN74ABT126NS implements four independent non-inverting buffers, each with separate 3-STATE enable control (active-low OE per channel). Its ABT logic family ensures TTL-level input thresholds (VIH = 2.0V, VIL = 0.8V) and 5V supply operation (4.5V–5.5V), enabling direct interfacing with legacy 74-series and microcontroller I/Os.
It provides bus contention avoidance via disable time (tPHZ ≤ 5.8ns) shorter than enable time (tPZH ≤ 6.5ns), and maintains high-impedance integrity across full power cycling - critical for live insertion in modular computing and telecom shelf architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5V to +5.5V - compatible with standard 5V TTL and CMOS logic rails |
| Output Drive | 32mA source / 64mA sink - sufficient to drive 50Ω transmission lines or multiple TTL loads |
| Propagation Delay | 1.0–4.6ns (tPLH/tPHL) - enables >200MHz data throughput in point-to-point links |
| Enable/Disable Timing | tPZH ≤ 6.5ns, tPHZ ≤ 5.8ns - ensures no bus contention during state transitions |
| Input Thresholds | VIH = 2.0V, VIL = 0.8V - matches standard TTL logic levels for seamless integration |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
| ESD Protection | JEDEC JS-001 Class 2 (2kV HBM) - robust handling in manufacturing and field service |
Pinout & Package
SN74ABT126NS is packaged in a 14-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" narrow body, with 1.27mm pitch and lead-free finish compliant with J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Input (A1–A4) | Non-inverting data inputs for each of four buffer channels |
| 2, 5, 11, 14 | Output (Y1–Y4) | 3-STATE buffered outputs; high-impedance when corresponding OE is HIGH |
| 3, 6, 8, 12 | Output Enable (OE1–OE4) | Active-low per-channel enable; independent control allows dynamic bus partitioning |
| 7 | GND | Ground reference for all logic and output stages |
| 14 | VCC | +5V supply rail; decoupling required within 1cm of pin per high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Nondestructive hot insertion | Withstands live connection/disconnection without latchup or parametric shift - validated per JEDEC JESD78 |
| Glitch-free bus loading | Maintains high-impedance state throughout full VCC ramp (0V → 5V) and collapse (5V → 0V) |
| Latchup protection | Guaranteed immunity to latchup at ±300mA injection per I/O - exceeds JEDEC JESD78 Class II |
| Asymmetric enable/disable timing | tPZH > tPHZ ensures outputs enter high-Z before new drivers activate - eliminates bus contention |
Applications
| Backplane Data Routing | Memory Address Buffering |
|---|---|
Use Scenario: Isolating and driving address/data signals between plug-in cards in a modular chassis with shared backplane bus. IC Role / Device Role / Timing Role: Quad buffer providing per-lane 3-STATE control to prevent signal contention during card hot-swap events. Use Value: Enables deterministic bus arbitration without external glue logic or timing delays - reduces system latency by up to 12ns per transaction. | Use Scenario: Driving multiplexed address lines from a microcontroller to multiple SRAM or Flash devices on a shared memory bus. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer with precise enable timing to synchronize address latching across memory banks. Use Value: Eliminates address skew between devices; supports simultaneous access to 4 memory regions with <4.6ns propagation delay variance. |
| Industrial PLC I/O Expansion | Digital Test Equipment Signal Conditioning |
Use Scenario: Interfacing programmable logic controller CPU modules with remote I/O racks over extended PCB traces. IC Role / Device Role / Timing Role: Signal integrity buffer isolating noise-sensitive control logic from high-current I/O drivers. Use Value: Maintains clean logic edges over 15cm trace lengths; 64mA sink capability drives optocoupler LEDs directly without external transistors. | Use Scenario: Conditioning DUT (device under test) signals in automated test equipment where signal fidelity and channel isolation are critical. IC Role / Device Role / Timing Role: Per-channel 3-STATE gating for test pattern sequencing and fault injection isolation. Use Value: Enables sub-7ns channel enable/disable switching - supports 150MHz pattern rates with zero inter-channel crosstalk during state transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad buffer with 3-STATE applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC126APW | 3.3V-only supply (1.65–3.6V); lower drive (24mA sink), higher speed (tPD = 3.1ns typ) | Requires level translation for 5V systems; suited for mixed-voltage FPGA interfaces | Select when migrating to 3.3V domains or integrating with LVC-family logic |
| SN74ALS126N | 5V-only; lower drive (20mA sink), higher VIH (2.0V min), slower tPD (10ns max) | Compatible with legacy ALS logic but lacks hot-insertion rating and latchup protection | Select only for cost-sensitive, non-hot-swap industrial retrofits with existing ALS infrastructure |
Compared with 74LVC126APW and SN74ALS126N, the SN74ABT126NS uniquely combines 5V TTL compatibility, 64mA sink strength, guaranteed latchup immunity, and validated hot-insertion capability - making it the sole choice for mission-critical 5V backplane and modular system designs requiring zero-failure bus management.
Availability
SN74ABT126NS is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, backplane data routing, and memory address buffering requiring stable component supply and long-term lifecycle support.
Supply support for SN74ABT126NS 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its ABT logic family remains widely deployed in industrial and telecom infrastructure.
The SN74ABT126NS belongs to Fairchild's Advanced BiCMOS Technology (ABT) logic series, engineered specifically for high-drive, hot-pluggable 5V bus interface applications demanding robustness, timing precision, and system-level reliability.
FAQ
What is the maximum operating temperature range for the SN74ABT126NS?
The SN74ABT126NS is rated for operation from –40°C to +85°C ambient temperature, meeting industrial-grade environmental requirements. This range is specified under recommended operating conditions with VCC = 4.5V to 5.5V and applies to all four buffer channels simultaneously. Junction temperature must not exceed +150°C under bias, and derating is required above +85°C ambient per thermal resistance data in the original Fairchild datasheet Rev. 1.4.0.
Does the SN74ABT126NS support hot insertion without external circuitry?
Yes, the SN74ABT126NS features nondestructive hot insertion capability as a guaranteed design feature - verified through latchup testing and power-ramp characterization. No external current-limiting resistors, TVS diodes, or sequencing controllers are required for safe live insertion into powered backplanes. This behavior is enabled by internal clamping structures and controlled turn-on characteristics documented in the "Features" section of the SN74ABT126NS datasheet.
What is the pin configuration for the SN74ABT126NS and how are the enable inputs arranged?
The SN74ABT126NS uses a 14-pin SOIC package (JEDEC MS-012) with four independent active-low output enables: OE1 on pin 3, OE2 on pin 6, OE3 on pin 8, and OE4 on pin 12. Each OE controls one buffer channel (A1→Y1, A2→Y2, etc.), allowing granular bus partitioning. Pin 7 is GND and pin 14 is VCC; unused pins do not exist - all 14 pins are assigned per the official connection diagram in the SN74ABT126NS datasheet.
Can the SN74ABT126NS be used with 3.3V logic inputs?
No, the SN74ABT126NS is not guaranteed to recognize 3.3V as a valid HIGH input level. Its VIH specification is 2.0V minimum at VCC = 4.5V–5.5V, but 3.3V inputs may fall below noise margin in marginal conditions. For reliable interfacing with 3.3V systems, level translation or use of a 3.3V-compatible alternative like 74LVC126APW is required. The SN74ABT126NS is designed exclusively for 5V TTL-compatible signaling.
What is the typical power consumption of the SN74ABT126NS during active operation?
The SN74ABT126NS draws 15mA maximum ICC when all outputs are LOW (ICCL), 50µA maximum when all outputs are HIGH (ICCH), and 50µA maximum in 3-STATE mode with OE = VCC (ICCZ). Dynamic supply current (ICCD) is 0.1mA/MHz per toggling bit under no-load conditions. Total active power at 5V and 10MHz toggle rate is typically <2.5mW per channel - measured with CL = 50pF and defined per the AC Electrical Characteristics table in the SN74ABT126NS datasheet.
SN74ABT126NS 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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SN74ABT126NS FAQ
1.How can I place an order for SN74ABT126NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT126NS 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 SN74ABT126NS reliable?
The price and inventory of SN74ABT126NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT126NS is usually 5 days.
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Once your SN74ABT126NS 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 SN74ABT126NS?
For technical support, including SN74ABT126NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT126NS requirements.
6.How does Aetrix verify that SN74ABT126NS is sourced from the original manufacturer or authorized distributors?
All SN74ABT126NS 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 SN74ABT126NS meets industry standards.
7.What is the process for return or replacement of SN74ABT126NS?
All SN74ABT126NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT126NS, 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 SN74ABT126NS part is unused and in its original packaging.
Return procedure for SN74ABT126NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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