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Texas Instruments SN74ABT126DB
- Part No.:
- SN74ABT126DB
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT126DB.pdf
- Description:
- BUS DRIVER, ABT SERIES
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Inventory:19,520
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Product details
Overview
SN74ABT126DB from Texas Instruments is a quadruple bus buffer gate with 3-state outputs in SSOP-14 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) at 5 V and 25°C.
For engineers reviewing the SN74ABT126DB datasheet, SN74ABT126DB pinout, SN74ABT126DB application, or SN74ABT126DB equivalent, this device is selected for robust bus buffering in industrial control backplanes, legacy microprocessor data paths, and memory interface isolation where TTL-compatible drive strength and power-cycle safety are critical.
Technical Context
The SN74ABT126DB implements four independent noninverting buffers, each with dedicated output-enable (OE) control. Each buffer transitions to high-impedance when its OE input is logic low, enabling true bus contention avoidance in shared-data architectures.
It operates over 4.5–5.5 V supply range with guaranteed 2.5 V VOH at −24 mA and 0.55 V VOL at 48 mA, and exhibits fast propagation delays (tPLH/tPHL ≤ 7.3 ns typical at 5 V). Power-up 3-state behavior is ensured below 2.1 V VCC, while pulldown resistors on OE pins maintain safe high-Z above that threshold.
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 noise margin compliance. |
| Output Drive | −32 mA IOH / 64 mA IOL - Enables direct driving of multiple TTL loads without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 7.3 ns (max) - Supports >100 MHz bus toggle rates in point-to-point configurations. |
| Power-Up 3-State | Active below 2.1 V VCC - Prevents bus contention during power ramp-up/down sequences. |
| Ioff Support | ±100 µA max at VCC = 0 V - Allows safe hot insertion into live backplanes without backfeeding. |
| ESD Rating | 2000-V HBM, 200-V MM - Meets industrial-grade ESD immunity requirements per JESD22. |
| Latch-Up | >500 mA per JESD17 - Guarantees robustness against transient-induced latch-up in noisy environments. |
Pinout & Package
SN74ABT126DB uses a 14-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 7.4 mm × 5.6 mm body size, and 2.0 mm max height. Pin 1 index is marked by a beveled corner or dot; thermal performance is characterized by θJA = 96°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Individual output-enable inputs | Active-high control per buffer; drives corresponding Y output to high-Z when low. |
| 1A, 2A, 3A, 4A | Buffer input terminals | Noninverting data inputs; accept TTL-level signals (VIH ≥ 2 V, VIL ≤ 0.8 V). |
| 1Y, 2Y, 3Y, 4Y | Buffer output terminals | High-drive 3-state outputs; sink up to 64 mA or source up to −32 mA. |
| VCC | Positive supply | 5-V nominal supply connection; decoupling capacitor required near pin 14. |
| GND | Ground reference | Signal and power return; must be low-impedance path to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | −32 mA source / 64 mA sink capability enables fanout of ≥10 standard TTL loads per channel. |
| Hot-Insertion Support | Ioff and power-up 3-state eliminate backdrive current and bus conflicts during live board replacement. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C ensures signal integrity during simultaneous output switching. |
| Robust Latch-Up Immunity | Exceeds 500 mA per JESD17 - eliminates risk of destructive latch-up in industrial transients. |
| TTL-Compatible Interface | VIH = 2 V min / VIL = 0.8 V max matches legacy 5-V TTL thresholds without level-shifting. |
Applications
| Industrial Backplane Buffering | Microprocessor Data Bus Isolation |
|---|---|
Use Scenario: Isolating parallel data buses between CPU and peripheral modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional buffer providing controlled enable/disable per bus segment to prevent contention during DMA transfers. Use Value: Eliminates need for discrete pull-up networks and reduces bus settling time via 64-mA sink drive. |
Use Scenario: Interfacing an 80C188 microprocessor with external SRAM and I/O expanders sharing a 16-bit data bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer enabling time-multiplexed access to memory and peripherals without bus contention. Use Value: Delivers sub-8 ns propagation delay and guaranteed high-Z during reset, ensuring clean boot sequencing. |
| Legacy Memory Interface | Test Equipment Signal Routing |
Use Scenario: Driving address/data lines from FPGA-based test pattern generators to vintage DRAM modules requiring TTL drive levels. IC Role / Device Role / Timing Role: Level-translating buffer matching FPGA CMOS outputs to 5-V TTL input thresholds of older memory ICs. Use Value: VIH/VIL specs ensure reliable recognition of logic states; Ioff prevents damage during module hot-swap. |
Use Scenario: Multiplexing stimulus signals across multiple DUT channels in automated test equipment racks. IC Role / Device Role / Timing Role: Channel-selectable buffer enabling one driver to feed multiple test nodes under software control. Use Value: Independent OE pins allow precise timing control of signal routing with no inter-channel crosstalk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244DBR | Octal (8-channel) configuration, identical 3-state architecture and drive strength, same SSOP-20 package. | Higher channel count suits wider buses (e.g., 32-bit data paths); requires PCB redesign due to different pin count and layout. | Select when system requires ≥8 isolated buffers and board space allows SSOP-20 footprint. |
| SN74LVC126APW | Lower voltage operation (1.65–3.6 V), 24-mA drive, TSSOP-14 package; lacks Ioff and power-up 3-state guarantees. | Suitable only for 3.3-V systems; not interoperable with 5-V TTL buses without level shifters. | Choose only for new 3.3-V designs where lower power and smaller voltage margins are acceptable. |
Compared with SN74ABT244DBR and SN74LVC126APW, the SN74ABT126DB uniquely balances 5-V TTL compatibility, proven industrial reliability, and compact 4-channel SSOP-14 form factor-making it optimal for retrofitting legacy 5-V systems without layout changes.
Availability
SN74ABT126DB is available at Aetrix Electronics and suitable for industrial control backplanes, microprocessor data bus isolation, and legacy memory interface applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT126DB 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 ABT logic family-including SN74ABT126DB-is engineered for high-speed, high-drive 5-V TTL bus interfacing in mission-critical industrial and computing infrastructure, emphasizing robustness, hot-swap safety, and legacy system compatibility.
FAQ
What is the maximum operating temperature range for the SN74ABT126DB?
The SN74ABT126DB is rated for operation from −40°C to +85°C ambient temperature. This industrial temperature range is validated per the recommended operating conditions table in the official TI datasheet SCBS183H, and applies specifically to the SSOP (DB) package variant.
Does the SN74ABT126DB support hot swapping in live backplane systems?
Yes, the SN74ABT126DB supports hot insertion via two key features: Ioff limits leakage to ±100 µA when VCC = 0 V, and power-up 3-state ensures high-impedance outputs during VCC ramp from 0 to 2.1 V. These are explicitly specified in the TI datasheet and apply to the SN74ABT126DB SSOP package.
Can the SN74ABT126DB be used with 3.3-V input signals?
No-the SN74ABT126DB is a 5-V TTL device with VIH minimum of 2.0 V and VIL maximum of 0.8 V. While 3.3-V logic may exceed VIH, it does not guarantee noise margin or consistent switching across temperature and process variation; TI does not characterize or guarantee operation below 4.5 V VCC.
What is the thermal resistance (θJA) of the SN74ABT126DB package?
The SN74ABT126DB in SSOP-14 package has a specified junction-to-ambient thermal resistance (θJA) of 96°C/W, measured per JESD 51-7 on a standard 4-layer JEDEC test board. This value is documented in the Absolute Maximum Ratings table of the TI datasheet SCBS183H.
Are pull-down resistors required on the OE pins of the SN74ABT126DB?
Yes-when VCC exceeds 2.1 V, OE must be held ≤0.8 V to guarantee high-impedance output. TI recommends tying OE to GND through a pulldown resistor; the minimum value depends on the driver's sourcing capability, as stated in the Functional Description section of the SN74ABT126DB datasheet.
SN74ABT126DB 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:
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- Output Type:
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- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
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- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SN74ABT126DB FAQ
1.How can I place an order for SN74ABT126DB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT126DB 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 SN74ABT126DB reliable?
The price and inventory of SN74ABT126DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT126DB is usually 5 days.
3.What payment methods are accepted for SN74ABT126DB?
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4.How is shipping managed for SN74ABT126DB?
SN74ABT126DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT126DB 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 SN74ABT126DB?
For technical support, including SN74ABT126DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT126DB requirements.
6.How does Aetrix verify that SN74ABT126DB is sourced from the original manufacturer or authorized distributors?
All SN74ABT126DB 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 SN74ABT126DB meets industry standards.
7.What is the process for return or replacement of SN74ABT126DB?
All SN74ABT126DB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT126DB, 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 SN74ABT126DB part is unused and in its original packaging.
Return procedure for SN74ABT126DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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