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Texas Instruments SN74ABT126N
- Part No.:
- SN74ABT126N
- Manufacturer:
- Texas Instruments
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT126N.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:432
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Product details
Overview
SN74ABT126N from Texas Instruments is a quadruple bus buffer gate with 3-state outputs in a 14-pin PDIP package, designed for bidirectional data bus isolation and level translation in 5-V TTL systems. It delivers high-drive capability (−32 mA IOH, 64 mA IOL), supports hot insertion via Ioff and power-up 3-state, and features low ground bounce (<1 V VOLP) for noise-sensitive digital interfaces.
For engineers reviewing the SN74ABT126N datasheet, SN74ABT126N pinout, SN74ABT126N application, or SN74ABT126N equivalent, this page provides verified functional specifications, validated pin assignments, real-world use cases in bus buffering and hot-swap subsystems, and two confirmed alternative parts with documented electrical and packaging differences.
Technical Context
The SN74ABT126N implements four independent noninverting buffers, each with dedicated output-enable (OE) control. Each channel transitions to high-impedance when its OE input is logic low, enabling bidirectional bus sharing without contention.
It operates across 4.5 V to 5.5 V supply range with guaranteed switching performance (tPLH/tPHL ≤ 7.3 ns at VCC = 5 V, TA = 25°C) and robust ESD protection (2000-V HBM, 200-V MM). Its Ioff specification (±100 µA at VCC = 0) ensures signal isolation during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL logic rails and margin against supply droop. |
| High-Level Output Current | −32 mA - Drives heavy capacitive loads or multiple TTL inputs without voltage collapse. |
| Low-Level Output Current | 64 mA - Sinks current from up to 10 standard TTL loads while maintaining VOL ≤ 0.55 V. |
| Propagation Delay | ≤ 7.3 ns (A to Y) - Supports >100 MHz bus operation in synchronous systems with tight timing budgets. |
| Ioff Current | ±100 µA at VCC = 0 - Prevents back-driving of powered-down sections during hot insertion or partial power-down. |
| ESD Rating | 2000-V HBM, 200-V MM - Meets industrial handling requirements without external protection circuitry. |
| Power-Up 3-State | Active below 2.1 V VCC - Guarantees bus isolation during power ramp-up, eliminating glitch risk on shared lines. |
Pinout & Package
SN74ABT126N uses a 14-pin plastic dual in-line package (PDIP-N) with 0.3-inch body width and through-hole mounting. Thermal resistance θJA is 80°C/W. Pin 1 is located at the left end of the top row, identified by a notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (1OE, 2OE, 3OE, 4OE) | Active-high control per channel; drives corresponding Y output to high-Z when low. |
| 2, 5, 9, 12 | Input (1A, 2A, 3A, 4A) | Noninverting data input for each buffer channel. |
| 3, 6, 11, 14 | Output (1Y, 2Y, 3Y, 4Y) | Buffered, 3-state output; high-drive, low-impedance when enabled, high-Z when disabled. |
| 7 | GND | Ground reference for all logic and output stages; must be low-impedance connection. |
| 14 | VCC | 5-V supply input; bypassing with 0.1 µF ceramic capacitor near pin recommended. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | −32 mA source / +64 mA sink enables direct interface to 10+ TTL loads or long PCB traces without buffers. |
| Hot-Insertion Support | Ioff (±100 µA) and power-up 3-state prevent current leakage and bus contention during live board replacement. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C reduces simultaneous switching noise that could corrupt adjacent signals. |
| Latch-Up Immunity | Exceeds 500 mA per JESD 17 - eliminates risk of destructive latch-up under transient overvoltage conditions. |
| Wide Operating Range | −40°C to +85°C ambient temperature rating supports industrial and telecom equipment deployment. |
Applications
| PCI Bus Isolation | Memory Address Buffering |
|---|---|
Use Scenario: Isolating PCI slot data lines from motherboard bus during card insertion/removal. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer providing hot-plug-safe data path control between slot and system bus. Use Value: Prevents bus contention and signal corruption using Ioff and power-up 3-state, meeting PCI mechanical spec requirements. |
Use Scenario: Driving address lines from microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer amplifying weak MCU address outputs to meet fanout and timing margins. Use Value: 64-mA sink capability ensures fast edge rates into 100-pF net capacitance, preserving setup/hold timing. |
| Test Equipment Signal Switching | Industrial PLC I/O Expansion |
Use Scenario: Routing DUT signals through automated test fixtures with programmable path selection. IC Role / Device Role / Timing Role: Channel-selectable buffer enabling dynamic reconfiguration of signal paths without hardware change. Use Value: Independent OE pins per channel allow precise per-line enable/disable, reducing test sequence complexity. |
Use Scenario: Interfacing field I/O modules to central controller CPU over extended backplane traces. IC Role / Device Role / Timing Role: Robust bus driver compensating for trace inductance and noise in electrically noisy factory environments. Use Value: High ESD rating (2000-V HBM) and latch-up immunity (>500 mA) ensure reliability in unshielded industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244N | Octal (8-channel) vs. quadruple (4-channel); identical VCC, drive strength, and 3-state behavior. | Requires PCB layout change due to 20-pin PDIP package and doubled channel count. | Select when higher channel density is needed and board space allows larger package and routing. |
| SN74LVC125N | Lower drive (−24 mA / +24 mA), 1.65–3.6 V supply range, no Ioff or power-up 3-state guarantee. | Not suitable for hot-swap or mixed-voltage 5-V/3.3-V bus interfacing without level-shifting. | Choose only for cost-sensitive, low-power 3.3-V systems where full ABT-level drive and robustness are unnecessary. |
Compared with SN74ABT244N and SN74LVC125N, the SN74ABT126N uniquely balances 4-channel density, 5-V TTL compatibility, hot-insertion safety, and industrial-grade noise immunity-making it optimal for legacy bus expansion and ruggedized control interfaces.
Availability
SN74ABT126N is available at Aetrix Electronics and suitable for PCI expansion, memory subsystem design, and industrial PLC I/O requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole assembly.
Supply support for SN74ABT126N 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 industrial reliability heritage.
The SN74ABT126N belongs to TI's ABT logic family, engineered for high-speed, high-drive 5-V TTL bus interfacing in mission-critical industrial, telecom, and computing infrastructure.
FAQ
What is the maximum operating temperature for the SN74ABT126N?
The SN74ABT126N is rated for operation from −40°C to +85°C ambient temperature. This range is validated per the recommended operating conditions table in the official datasheet and supports deployment in industrial control cabinets and telecom base stations without derating.
Does the SN74ABT126N support hot insertion?
Yes, the SN74ABT126N supports hot insertion via two key features: Ioff (±100 µA at VCC = 0) prevents current flow when powered down, and power-up 3-state ensures high-impedance outputs until VCC exceeds 2.1 V. These are explicitly specified in the datasheet's feature list and absolute maximum ratings.
What is the pin 1 marking method for SN74ABT126N?
The SN74ABT126N uses a molded notch at the top-left corner of the PDIP package to indicate pin 1 location. The part marking "SN74ABT126N" is laser-etched on the top surface, aligned left-justified relative to the notch, per TI's standard PDIP marking convention.
Can SN74ABT126N drive a 50-pF load within 7 ns propagation delay?
Yes. At VCC = 5 V and TA = 25°C, the SN74ABT126N guarantees tPLH/tPHL ≤ 7.3 ns into a 50-pF load (per Figure 1 test condition), satisfying sub-7-ns timing for 100-MHz synchronous buses with adequate margin.
Is there a lead-free version of SN74ABT126N available?
Yes. The SN74ABT126N is RoHS-compliant with lead finish/NiPdAu (NIPDAU) plating, as confirmed in TI's Package Option Addendum. The "Yes" RoHS status and NIPDAU lead finish are explicitly listed for orderable part number SN74ABT126N.
SN74ABT126N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
SN74ABT126N FAQ
1.How can I place an order for SN74ABT126N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT126N 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 SN74ABT126N reliable?
The price and inventory of SN74ABT126N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT126N is usually 5 days.
3.What payment methods are accepted for SN74ABT126N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT126N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT126N?
SN74ABT126N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT126N 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 SN74ABT126N?
For technical support, including SN74ABT126N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT126N requirements.
6.How does Aetrix verify that SN74ABT126N is sourced from the original manufacturer or authorized distributors?
All SN74ABT126N 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 SN74ABT126N meets industry standards.
7.What is the process for return or replacement of SN74ABT126N?
All SN74ABT126N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT126N, 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 SN74ABT126N part is unused and in its original packaging.
Return procedure for SN74ABT126N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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