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Texas Instruments SN74ABT126DBR
- Part No.:
- SN74ABT126DBR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT126DBR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,040
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Product details
Overview
SN74ABT126DBR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs in SSOP-14 package, designed for high-speed bidirectional data bus isolation in industrial and computing systems. It delivers −32-mA high-level and 64-mA low-level output drive, supports hot insertion via Ioff and power-up 3-state, and operates across −40°C to 85°C at 4.5–5.5 V supply.
For engineers reviewing the SN74ABT126DBR datasheet, SN74ABT126DBR pinout, SN74ABT126DBR application, or SN74ABT126DBR equivalent, key selection criteria include 3-state control per channel, ground-bounce immunity (<1 V VOLP), latch-up robustness (>500 mA), and compatibility with TTL/CMOS logic levels in space-constrained SSOP layouts.
Technical Context
The SN74ABT126DBR implements four independent noninverting buffers, each with dedicated output-enable (OE) control enabling per-channel bus contention prevention. Its ABT logic family ensures TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and fast propagation delays (tPLH/tPHL ≤ 7.3 ns at 5 V).
It features active-high 3-state control, high-impedance state during power-up/down (VCC < 2.1 V), and Ioff protection that disables current flow when VCC = 0 V-critical for live-insertion backplane and hot-swap applications requiring signal integrity during partial power states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation in standard 5-V digital systems with ±10% tolerance. |
| Output Drive | −32 mA IOH / 64 mA IOL - Supports driving heavy capacitive loads and multiple TTL inputs without signal degradation. |
| Propagation Delay | tPLH/tPHL ≤ 7.3 ns @ 5 V - Enables reliable timing in high-speed data paths up to ~100 MHz clock domains. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Guarantees interoperability with legacy TTL and mixed-voltage CMOS interfaces. |
| Thermal Resistance | θJA = 96°C/W (SSOP-DB) - Defines maximum power dissipation limit (~350 mW at ΔT = 34°C rise) for board-level thermal design. |
| ESD Rating | 2000-V HBM, 200-V MM - Meets industrial-grade ESD immunity requirements without external protection. |
| Latch-Up | >500 mA per JESD 17 - Prevents destructive latch-up under transient overvoltage or ground bounce events. |
Pinout & Package
SN74ABT126DBR uses a 14-pin SSOP (Shrink Small Outline Package) with 0.65-mm pitch, 7.4-mm body width, and 2-mm max height. Pin 1 index area located at top-left corner with notch marking orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (1OE, 2OE, 3OE, 4OE) | Active-high control per buffer; drives associated Y output to high-Z when low. |
| 2, 5, 11, 14 | Input (1A, 2A, 3A, 4A) | Noninverting data input for corresponding buffer channel. |
| 3, 6, 12, 9 | Output (1Y, 2Y, 3Y, 4Y) | Buffered noninverting output; enters high-impedance state when OE = L. |
| 7 | GND | Ground reference for all logic and output stages; must be low-impedance connection. |
| 14 | VCC | 5-V supply rail; decoupling capacitor required within 1 cm of pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel 3-state control | Enables selective bus isolation without disabling entire IC-reduces system-level arbitration complexity. |
| Power-up/down high-impedance | Prevents bus contention during brown-out or sequencing faults by forcing outputs to Z-state below 2.1 V VCC. |
| Ioff support | Blocks current flow between powered and unpowered sections-essential for hot-plug PCIe, CompactPCI, and modular backplanes. |
| Low ground bounce (VOLP < 1 V) | Maintains signal integrity during simultaneous switching output (SSO) events in dense PCB layouts. |
| TTL-compatible input thresholds | Eliminates need for level-shifting circuitry when interfacing with legacy 5-V microcontrollers or FPGAs. |
Applications
| Industrial PLC Backplane Interface | Embedded Computing Data Bus Isolation |
|---|---|
Use Scenario: Isolating CPU-to-I/O module communication on a modular PLC rack where modules may be inserted or removed while powered. IC Role / Device Role / Timing Role: Bidirectional buffer with per-slot OE control, ensuring no bus contention during hot-swap events. Use Value: Enables zero-downtime maintenance via Ioff and power-up 3-state behavior, eliminating need for system reset during field upgrades. | Use Scenario: Separating memory-mapped peripherals from main processor bus in an ARM-based industrial controller. IC Role / Device Role / Timing Role: Noninverting bus driver with sub-8 ns propagation delay, synchronizing peripheral access within tight timing budgets. Use Value: Maintains timing margin for 25-MHz bus cycles while driving 30-pF trace + 3x TTL load capacitance reliably. |
| Test Equipment Signal Routing Matrix | Legacy System Bus Extension |
Use Scenario: Configurable signal path routing in automated test equipment where multiple DUT interfaces share common bus lines. IC Role / Device Role / Timing Role: Quad-channel enable-controlled buffer allowing dynamic reconfiguration of signal paths without hardware changes. Use Value: Reduces FPGA I/O count by offloading bus gating logic; supports concurrent multi-DUT testing via software-selectable OE states. | Use Scenario: Extending ISA or PCI bus traces across daughterboard connectors in retro-computing or medical diagnostic equipment. IC Role / Device Role / Timing Role: High-drive repeater compensating for trace loss and connector impedance discontinuities. Use Value: Restores signal edge rate degraded by >15-cm routed traces, meeting setup/hold timing for legacy 8-MHz ISA peripherals. |
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) vs. quad (4-channel); identical ABT logic, same SSOP-20 package. | Higher channel density for wider buses; requires more PCB area and layout revision. | Select when expanding bus width beyond 4 bits or consolidating multiple SN74ABT126DBR units onto one IC. |
| SN74LVC126APWR | 3.3-V only (1.65–3.6 V), lower drive (−24/24 mA), smaller TSSOP-14 package. | Not suitable for 5-V systems; lacks Ioff and high-impedance power-up behavior. | Choose only for new 3.3-V designs prioritizing lower power and smaller footprint over hot-swap capability. |
Compared with SN74ABT244DBR and SN74LVC126APWR, the SN74ABT126DBR uniquely balances 5-V compatibility, per-channel 3-state control, and hot-insertion readiness-making it optimal for industrial backplane and legacy bus extension where voltage and sequencing robustness are non-negotiable.
Availability
SN74ABT126DBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded computing data bus isolation, and test equipment signal routing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ABT126DBR 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets since 1930.
The SN74ABT126DBR belongs to TI's ABT logic family, engineered specifically for high-speed, high-drive 5-V bus interface applications demanding robust hot-swap, ground-bounce immunity, and TTL compatibility.
FAQ
What is the recommended pull-down resistor value for OE pins on SN74ABT126DBR?
For guaranteed high-impedance state above 2.1 V VCC, TI specifies tying OE to GND via a pulldown resistor. The minimum value depends on the current-sourcing capability of the upstream driver; typical values range from 1 kΩ to 10 kΩ. For SN74ABT126DBR, a 4.7-kΩ resistor ensures reliable low-state assertion while minimizing quiescent current draw in enabled configurations.
Does SN74ABT126DBR support mixed-voltage operation between 3.3 V and 5 V logic domains?
No-SN74ABT126DBR is specified only for 4.5–5.5 V VCC operation and TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V). It does not support 3.3-V core logic or I/O translation. For mixed-voltage systems, use dedicated level translators like SN74AVC4T245 or SN74LVC8T245 alongside SN74ABT126DBR.
Can SN74ABT126DBR be used in place of SN74ABT126DR in an existing SOIC layout?
No-SN74ABT126DBR uses SSOP-14 (0.65-mm pitch, 7.4-mm width), while SN74ABT126DR uses SOIC-14 (1.27-mm pitch, 8.75-mm width). Footprints are mechanically incompatible; direct replacement requires PCB redesign. Thermal resistance also differs (96°C/W vs. 86°C/W), affecting power derating calculations.
What is the maximum capacitive load SN74ABT126DBR can drive while maintaining tPLH/tPHL ≤ 7.3 ns?
TI characterizes SN74ABT126DBR switching performance with CL = 50 pF (including probe and jig capacitance). At this load, tPLH/tPHL remains ≤ 7.3 ns at 5 V. Driving >75 pF increases delay nonlinearly and risks exceeding timing margins; for heavier loads, add series termination or reduce trace length to maintain SN74ABT126DBR's specified propagation performance.
Is SN74ABT126DBR compliant with JEDEC JESD22-A114 (HBM) and JESD22-A115 (MM) standards?
Yes-SN74ABT126DBR exceeds JEDEC JESD22-A114-A (2000-V Human-Body Model) and JESD22-A115-A (200-V Machine Model) ESD specifications. This compliance is verified per TI's production test flow and documented in the SCBS183H datasheet, confirming suitability for handling in non-ESD-protected assembly environments.
SN74ABT126DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 14-SSOP (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-SSOP
SN74ABT126DBR FAQ
1.How can I place an order for SN74ABT126DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT126DBR 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 SN74ABT126DBR reliable?
The price and inventory of SN74ABT126DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT126DBR is usually 5 days.
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SN74ABT126DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT126DBR 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 SN74ABT126DBR?
For technical support, including SN74ABT126DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT126DBR requirements.
6.How does Aetrix verify that SN74ABT126DBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT126DBR 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 SN74ABT126DBR meets industry standards.
7.What is the process for return or replacement of SN74ABT126DBR?
All SN74ABT126DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT126DBR, 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 SN74ABT126DBR part is unused and in its original packaging.
Return procedure for SN74ABT126DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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