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Texas Instruments SN74ABT126NSR
- Part No.:
- SN74ABT126NSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT126NSR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,438
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Product details
Overview
SN74ABT126NSR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for bidirectional data bus isolation and signal conditioning in 5-V TTL-compatible digital systems. It features independent output-enable control per channel, high-drive capability (−32 mA IOH / 64 mA IOL), low ground bounce (<1 V), and power-up/power-down high-impedance state - enabling hot-insertion support in backplane and modular interface applications.
For engineers reviewing the SN74ABT126NSR datasheet, SN74ABT126NSR pinout, SN74ABT126NSR application, or SN74ABT126NSR equivalent, this page delivers verified electrical specs, SOP-14 package details, real-world use cases in industrial control backplanes and memory expansion interfaces, and two validated alternative parts with functional and layout implications clearly differentiated.
Technical Context
The SN74ABT126NSR implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Its ABT logic family delivers TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and rail-to-rail CMOS-compatible output swing under 4.5–5.5 V supply.
It supports hot insertion via Ioff protection and power sequencing robustness: outputs enter high-impedance when VCC is between 0–2.1 V, and maintain it above 2.1 V if OE is held ≤0.8 V - requiring external pulldown resistors for guaranteed behavior during ramp-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage system rails. |
| Output Drive | −32 mA IOH / +64 mA IOL - enables direct driving of heavy capacitive loads (e.g., >100 pF buses) without external buffers. |
| Propagation Delay | 1 ns to 7.3 ns (tPLH/tPHL) - supports reliable operation up to ~100 MHz data rates in point-to-point bus segments. |
| 3-State Enable/Disable | tPZL = 4.4–6.4 ns, tPHZ = 3–6.9 ns - guarantees fast bus release and acquisition for time-critical arbitration protocols. |
| Input Clamp Current | ±18 mA - protects against transient overvoltage events on address/data lines without external TVS diodes. |
| Thermal Resistance | θJA = 76°C/W (NS package) - allows sustained 100 mA total output current at TA ≤ 70°C with minimal derating. |
Pinout & Package
SOP-14 (NS) package: 14-pin small-outline plastic package, 5.3 mm × 10.2 mm body, 1.27 mm pitch, 1.75 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Active-Low Output Enable) | Independent enable control per buffer; pulls output to high-Z when low - critical for bus arbitration and multi-master contention avoidance. |
| 2, 5, 11, 14 | A (Data Input) | Noninverting input per channel; accepts TTL/CMOS logic levels; VIH = 2 V min ensures noise margin in noisy industrial environments. |
| 3, 6, 12, 9 | Y (Buffered Output) | 3-state output with high-drive strength; VOH ≥ 2.0 V @ −24 mA ensures valid HIGH to downstream TTL inputs. |
| 7 | GND | Signal reference and return path for all I/O; must be low-inductance connection to minimize ground bounce (VOLP < 1 V). |
| 14 | VCC | 5-V power supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Hot-insertion support | Ioff protection and power-cycle high-Z behavior allow safe insertion into live 5-V backplanes without disrupting bus operation. |
| High-noise immunity | 100 mV input hysteresis (Vhys) and 2 V VIH threshold suppress false triggering from EMI in motor-control or PLC environments. |
| Low ground bounce | Typical VOLP < 1 V at 5 V/25°C enables clean signal integrity on shared ground planes with multiple drivers. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - eliminates risk of destructive latch-up during voltage transients in industrial power supplies. |
| ESD robustness | 2000-V HBM / 200-V MM rating - reduces need for external ESD protection on board-level I/O connectors. |
Applications
| Industrial Backplane Interface | Memory Expansion Module |
|---|---|
Use Scenario: Isolating CPU address/data buses from plug-in I/O modules in programmable logic controllers (PLCs) with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-lane OE control, enabling dynamic module detection and arbitration-free data routing. Use Value: Prevents bus contention during insertion/removal; 64-mA drive sustains signal integrity across 15-cm backplane traces with 80-pF loading. | Use Scenario: Expanding SRAM capacity in embedded instrumentation by buffering address latches and data lines between MCU and parallel memory banks. IC Role / Device Role / Timing Role: Noninverting 3-state repeater that matches propagation delay (≤7.3 ns) to memory access timing budgets. Use Value: Eliminates timing skew between address and data paths; high drive strength drives 10+ memory inputs without fanout degradation. |
| Test Equipment Bus Controller | Digital Signal Acquisition Front-End |
Use Scenario: Managing GPIB or VXIbus signal routing in automated test equipment where multiple instruments share a common control bus. IC Role / Device Role / Timing Role: Directional bus isolator with independent OE pins, allowing software-selectable instrument addressing and read/write gating. Use Value: Enables deterministic bus turnaround via controlled tPHZ/tPZL (≤6.9 ns); Ioff prevents leakage-induced logic errors during idle periods. | Use Scenario: Conditioning parallel ADC output lines before feeding into FPGA-based data capture logic in high-channel-count DAQ systems. IC Role / Device Role / Timing Role: Low-skew buffer stage that preserves setup/hold timing margins between ADC data valid window and FPGA sampling clock. Use Value: 1-ns min tPLH ensures sub-ns alignment across 4-bit nibbles; 7-pF Co minimizes added capacitance on sensitive analog-domain digital lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244NSR | Octal (8-channel) vs. quadruple (4-channel); identical ABT logic, same SOP-20 package footprint. | Requires PCB redesign due to different pin count and layout; suitable only when higher channel density is needed. | Select when expanding bus width beyond 4 lines; not drop-in - verify OE pin mapping and thermal derating (θJA = 80°C/W). |
| SN74LVC126ANSR | Lower voltage (1.65–3.6 V), lower drive (−24/+24 mA), no Ioff or hot-insertion support. | Not suitable for 5-V legacy systems or hot-swap; limited to 3.3-V modern microcontrollers with light bus loading. | Choose only for new 3.3-V designs with strict power budget; requires level-shifting for 5-V interface compatibility. |
Compared with SN74ABT244NSR and SN74LVC126ANSR, the SN74ABT126NSR uniquely balances 5-V TTL compatibility, hot-insertion safety, and compact 4-channel buffering - making it optimal for retrofitting industrial backplanes without changing connector pinouts or power architecture.
Availability
SN74ABT126NSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion modules, automated test equipment bus controllers, and digital signal acquisition front-ends requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT126NSR 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 decades of heritage in industrial-grade logic families.
The SN74ABT126NSR belongs to TI's ABT-series advanced biCMOS bus interface portfolio, engineered specifically for robust 5-V digital systems demanding hot-swap resilience, high noise immunity, and precise timing control in harsh electromagnetic environments.
FAQ
What is the maximum operating temperature range for the SN74ABT126NSR?
The SN74ABT126NSR is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range is confirmed in the "recommended operating conditions" table of the official datasheet (SCBS183H, May 2003 revision), and applies specifically to the NS-package variant used in the SN74ABT126NSR orderable part.
Does the SN74ABT126NSR support hot insertion, and how is it implemented?
Yes, the SN74ABT126NSR supports hot insertion via two integrated features: Ioff protection (±100 µA max off-state current when VCC = 0) and power-up/power-down high-impedance behavior. When VCC ramps between 0–2.1 V, outputs automatically enter high-Z; above 2.1 V, OE must be held ≤0.8 V (e.g., via pulldown resistor) to maintain isolation - a design requirement explicitly documented for the SN74ABT126NSR.
What are the absolute maximum ratings for supply voltage and output current on the SN74ABT126NSR?
The SN74ABT126NSR has an absolute maximum supply voltage (VCC) of −0.5 V to +7 V, and absolute maximum output sink current (IOL) of 128 mA per pin. These values are specified in the "absolute maximum ratings" table of the datasheet and apply to the NS package. Exceeding them risks permanent damage, regardless of duration.
Can unused inputs on the SN74ABT126NSR be left floating?
No - all unused inputs on the SN74ABT126NSR must be tied to either VCC or GND. The datasheet (Note 4, SCBS183H) explicitly mandates this to prevent undefined logic states, increased ICC, and potential oscillation. Floating inputs violate recommended operating conditions and may cause erratic 3-state behavior or excessive power draw in the SN74ABT126NSR.
What is the thermal resistance (θJA) of the SN74ABT126NSR in its SOP-14 (NS) package?
According to the datasheet's "absolute maximum ratings" table, the SN74ABT126NSR in the NS package has a junction-to-ambient thermal resistance (θJA) of 76°C/W. This value is measured under JEDEC-standard conditions and is critical for calculating junction temperature rise under load - e.g., at 100 mA total output current, ΔTJ = 7.6°C above ambient.
SN74ABT126NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- 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:
- 32mA, 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
SN74ABT126NSR FAQ
1.How can I place an order for SN74ABT126NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT126NSR 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 SN74ABT126NSR reliable?
The price and inventory of SN74ABT126NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT126NSR is usually 5 days.
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4.How is shipping managed for SN74ABT126NSR?
SN74ABT126NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT126NSR 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 SN74ABT126NSR?
For technical support, including SN74ABT126NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT126NSR requirements.
6.How does Aetrix verify that SN74ABT126NSR is sourced from the original manufacturer or authorized distributors?
All SN74ABT126NSR 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 SN74ABT126NSR meets industry standards.
7.What is the process for return or replacement of SN74ABT126NSR?
All SN74ABT126NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT126NSR, 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 SN74ABT126NSR part is unused and in its original packaging.
Return procedure for SN74ABT126NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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