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Texas Instruments SN74ABT126PWR
- Part No.:
- SN74ABT126PWR
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT126PWR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,652
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Product details
Overview
SN74ABT126PWR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs in a 14-pin TSSOP package, operating at 4.5–5.5 V supply, delivering ±32 mA high-drive outputs and supporting hot insertion via Ioff and power-up 3-state logic - used in bidirectional data bus isolation for industrial control backplanes.
For engineers reviewing the SN74ABT126PWR datasheet, SN74ABT126PWR pinout, SN74ABT126PWR application, or SN74ABT126PWR equivalent, key selection criteria include output drive strength (−32 mA IOH / 64 mA IOL), propagation delay (1–7.3 ns), thermal resistance (113°C/W), and guaranteed high-impedance state during power-up/down.
Technical Context
This device implements four independent noninverting buffers, each with dedicated output-enable (OE) control. Each buffer transitions to high-impedance when its OE input is low, enabling true bus contention avoidance in shared-data-path systems.
It features active-low 3-state control, TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), and robust ESD protection (2000-V HBM, 200-V MM). The design ensures safe hot-insertion by maintaining high-impedance during VCC ramp (0–2.1 V) and supports pulldown-resistor biasing of OE above 2.1 V.
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 ABT logic families without level-shifting. |
| Output Drive | −32 mA IOH / +64 mA IOL - enables direct driving of heavy capacitive loads (e.g., >50 pF buses) without external buffers. |
| Propagation Delay | 1–7.3 ns (tPLH/tPHL) - supports high-speed data transfer up to ~100 MHz in short-bus configurations. |
| Power-Up Behavior | High-impedance state when VCC ∈ [0, 2.1 V] - prevents bus contention during system power sequencing. |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial handling requirements without additional board-level protection. |
| Thermal Resistance | θJA = 113°C/W (PW package) - defines maximum allowable power dissipation (≈360 mW at 85°C ambient) before derating. |
| Input Clamp Current | −18 mA - limits damage from transient overvoltage events on inputs while preserving signal integrity. |
Pinout & Package
TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad optional per design; RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (OE) | Active-low control per buffer; asserts high-impedance on corresponding Y output when low. |
| 2, 5, 9, 12 | Input (A) | Noninverting data input for respective buffer channel (1A–4A). |
| 3, 6, 8, 11 | Output (Y) | 3-state buffered output (1Y–4Y); driven high/low when OE high, high-Z when OE low. |
| 7 | GND | Ground reference for all logic and output stages; must be low-impedance connection. |
| 14 | VCC | Primary 4.5–5.5 V supply; decoupling capacitor (0.1 µF) required within 1 cm. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | −32 mA IOH / +64 mA IOL enables direct interface to unterminated 50-Ω transmission lines or multi-load buses. |
| Hot-Insertion Support | Ioff (±100 µA at VCC = 0) and power-up 3-state prevent backfeeding and bus conflicts during live card replacement. |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V ensures stable logic-low referencing during simultaneous switching output (SSO) events. |
| Latch-Up Immunity | Exceeds 500 mA per JESD 17 - eliminates risk of destructive latch-up under transient overcurrent conditions. |
| Wide Operating Range | −40°C to +85°C ambient temperature rating supports deployment in industrial automation and telecom infrastructure. |
Applications
| Industrial Backplane Isolation | Test Equipment Signal Routing |
|---|---|
Use Scenario: Isolating CPU address/data buses from peripheral modules in modular PLC racks with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling dynamic bus arbitration between master and slave cards without contention. Use Value: Prevents data corruption during module insertion/removal and sustains signal integrity across 15-cm backplane traces. |
Use Scenario: Multiplexing DUT signals to measurement instruments in automated test systems with reconfigurable channel mapping. IC Role / Device Role / Timing Role: Output-enabled gate controlling path selection between FPGA I/O banks and analog/digital test ports. Use Value: Enables sub-10 ns signal routing latency and eliminates cross-talk via guaranteed high-Z between selections. |
| Legacy Bus Interface Adapter | Embedded Controller Expansion Hub |
Use Scenario: Bridging 5-V TTL microcontroller GPIOs to legacy ISA or VMEbus peripherals requiring higher drive strength. IC Role / Device Role / Timing Role: Level-consistent buffer translating logic states while boosting current delivery beyond MCU native capability. Use Value: Eliminates need for discrete transistor arrays; maintains timing margins with tPHL ≤ 5.7 ns at 5 V. |
Use Scenario: Expanding I/O count on ARM-based edge controllers managing multiple sensor clusters and actuator drivers. IC Role / Device Role / Timing Role: Local bus repeater isolating noisy motor-driver sections from sensitive analog acquisition circuitry. Use Value: Reduces ground bounce-induced ADC errors via VOLP < 1 V and provides Ioff isolation during sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126APWR | Lower voltage range (1.65–3.6 V), ±24 mA drive, 3.3-V logic only. | Not suitable for 5-V legacy systems; requires level translation if interfacing with ABT-family devices. | Select when designing new 3.3-V systems prioritizing lower power and smaller die size. |
| SN74AHCT126PW | Same 5-V operation but CMOS input structure (VIH = 2 V min), ±8 mA drive, slower propagation (typ. 8 ns). | Compatible pinout but insufficient drive for heavy bus loads; lacks Ioff and robust hot-swap behavior. | Choose only for cost-sensitive 5-V applications with light capacitive loading (<20 pF) and no hot-insertion requirement. |
Compared with SN74LVC126APWR and SN74AHCT126PW, the SN74ABT126PWR uniquely delivers 5-V TTL-compatible operation, highest output drive (±32/64 mA), and certified hot-insertion support - making it irreplaceable in industrial backplane and legacy bus designs demanding robustness and speed.
Availability
SN74ABT126PWR is available at Aetrix Electronics and suitable for industrial backplane isolation, automated test equipment signal routing, and embedded controller expansion hubs requiring stable component supply and long-term production continuity.
Supply support for SN74ABT126PWR 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 experience in high-reliability industrial and automotive-grade components.
The SN74ABT126PWR belongs to TI's ABT logic family, engineered for high-speed, high-drive 5-V bus interfacing in noise-immune industrial environments where signal integrity and hot-swap safety are critical.
FAQ
What is the recommended pull-down resistor value for OE on SN74ABT126PWR?
The minimum OE pulldown resistor value depends on the driver's current-sourcing capability. For reliable low-state assertion above 2.1 V VCC, TI recommends ≤10 kΩ to ensure OE remains ≤0.8 V under worst-case leakage. This guarantees high-impedance output during power-up transients and prevents unintended bus activation in the SN74ABT126PWR.
Does SN74ABT126PWR support hot insertion in live backplane systems?
Yes, SN74ABT126PWR supports hot insertion via two key features: Ioff (±100 µA at VCC = 0) prevents current backflow during card insertion, and power-up 3-state ensures high-impedance output when VCC is between 0–2.1 V. These mechanisms eliminate bus contention and protect upstream logic - confirmed in the SN74ABT126PWR datasheet Section 1.
What is the maximum capacitive load SN74ABT126PWR can drive reliably?
SN74ABT126PWR is characterized up to 50 pF load (per Figure 1 test condition), with propagation delays specified at CL = 50 pF. Driving >50 pF increases tPLH/tPHL nonlinearly and may exceed timing budgets; for >75 pF, derating or local termination is advised. The SN74ABT126PWR's ±64 mA IOL supports moderate trace lengths but not full-length parallel buses without repeaters.
Can SN74ABT126PWR operate at 3.3 V supply?
No. SN74ABT126PWR is specified only for 4.5–5.5 V operation per Recommended Operating Conditions. At 3.3 V, VIH/VIL thresholds are unmet, output drive collapses, and functionality is not guaranteed. For 3.3-V systems, use SN74LVC126APWR instead - the SN74ABT126PWR is incompatible with sub-4.5 V rails.
Is there a pin-compatible 5-V alternative with lower power consumption than SN74ABT126PWR?
No fully pin-compatible 5-V alternative offers lower static power while retaining SN74ABT126PWR's drive strength and hot-swap features. SN74AHCT126PW shares the PW package and pinout but delivers only ±8 mA and lacks Ioff - increasing system-level power and compromising hot-swap safety. The SN74ABT126PWR remains optimal where performance and robustness outweigh quiescent current concerns.
SN74ABT126PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm 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-TSSOP
SN74ABT126PWR FAQ
1.How can I place an order for SN74ABT126PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT126PWR 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 SN74ABT126PWR reliable?
The price and inventory of SN74ABT126PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT126PWR is usually 5 days.
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SN74ABT126PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT126PWR 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 SN74ABT126PWR?
For technical support, including SN74ABT126PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT126PWR requirements.
6.How does Aetrix verify that SN74ABT126PWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT126PWR 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 SN74ABT126PWR meets industry standards.
7.What is the process for return or replacement of SN74ABT126PWR?
All SN74ABT126PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT126PWR, 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 SN74ABT126PWR part is unused and in its original packaging.
Return procedure for SN74ABT126PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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