My Inquiry
My Account
Texas Instruments SN74ABT126D
- Part No.:
- SN74ABT126D
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ABT126D.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:660
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ABT126D from Texas Instruments is a quadruple bus buffer gate with 3-state outputs in a 14-pin SOIC package, operating at 4.5–5.5 V, delivering ±32-mA high-drive capability and supporting hot insertion via Ioff and power-up 3-state functionality - used in bidirectional data bus isolation for industrial control backplanes.
For engineers reviewing the SN74ABT126D datasheet, SN74ABT126D pinout, SN74ABT126D application, or SN74ABT126D equivalent, key selection criteria include guaranteed 3-state behavior during power ramp (0–2.1 V), output ground bounce <1 V, latch-up immunity >500 mA, and compatibility with TTL-level input thresholds (VIL = 0.8 V, VIH = 2.0 V).
Technical Context
The SN74ABT126D implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Its ABT logic family delivers TTL-compatible input thresholds and high-current CMOS outputs, enabling direct interfacing between legacy TTL and modern 5-V CMOS systems without level translation.
It features inherent power sequencing robustness: outputs enter high-impedance state when VCC is below 2.1 V, and Ioff limits current flow when powered down - critical for live-insertion in modular backplane architectures where bus segments may be hot-swapped.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5-V rail tolerances and brown-out margins. |
| Output Drive | −32 mA IOH / +64 mA IOL - drives heavy capacitive loads (e.g., long PCB traces or multiple inputs) without signal degradation. |
| Propagation Delay | 1 ns to 7.3 ns (tPLH/tPHL) - supports high-speed bus timing up to ~100 MHz in short-path configurations. |
| Enable/Disable Time | 1 ns to 6.9 ns (tPZL/tPHZ) - enables rapid bus arbitration and dynamic channel switching. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - matches standard TTL logic levels for seamless integration with legacy controllers and peripherals. |
| ESD Protection | 2000-V HBM, 200-V MM - meets industrial-grade ESD immunity requirements per JESD22. |
| Latch-Up Immunity | >500 mA per JESD17 - prevents destructive latch-up during transient overvoltage events on shared bus lines. |
Pinout & Package
SN74ABT126D uses a 14-pin SOIC (D) package with 1.27-mm pitch, 8.65 mm × 3.91 mm body, and 1.75-mm max height - compatible with standard SOIC footprints and reflow profiles (MSL Level-1, 260°C peak).
| 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 - enables selective bus segment activation. |
| 2, 5, 9, 12 | A (Input) | Noninverting data input for corresponding buffer - accepts TTL/CMOS logic levels directly. |
| 3, 6, 8, 11 | Y (Output) | 3-state buffered output with high-drive strength - sinks 64 mA or sources 32 mA while maintaining logic integrity. |
| 7 | GND | Power return reference for all logic and output stages - must be low-impedance for ground-bounce suppression. |
| 14 | VCC | 5-V supply input - decoupling capacitor (0.1 µF) required near pin to minimize supply noise during switching. |
Key Features
| Feature | Design Value |
|---|---|
| High-Impedance During Power Up/Down | Guaranteed Z-state when VCC ∈ [0, 2.1] V - eliminates bus contention during system power sequencing. |
| Ioff Support for Hot Insertion | Input/output current limited to ±100 µA at VCC = 0 - prevents back-driving of live bus lines during module replacement. |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V - maintains signal integrity under fast switching into capacitive loads. |
| TTL-Compatible Input Levels | VIH = 2.0 V, VIL = 0.8 V - interoperates with legacy 5-V microcontrollers, FPGAs, and ASICs without level shifters. |
| Robust ESD/Latch-Up Performance | 2000-V HBM ESD rating and >500 mA latch-up immunity - suitable for industrial environments with frequent handling and electrical transients. |
Applications
| Industrial Backplane Bus Isolation | Legacy System Interface Bridge |
|---|---|
Use Scenario: Isolating CPU address/data buses from peripheral modules in programmable logic controllers (PLCs) with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling dynamic bus segment enable/disable without contention during module insertion/removal. Use Value: Prevents bus lockup and data corruption during field maintenance by ensuring high-Z state at all VCC ramp phases. | Use Scenario: Interfacing a modern 5-V FPGA I/O bank to legacy TTL-based memory or display controllers. IC Role / Device Role / Timing Role: Level-tolerant buffer translating between FPGA's CMOS output drive and TTL input thresholds while providing fanout gain. Use Value: Eliminates need for discrete level-shifting circuitry and reduces board area/cost in mixed-technology designs. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
Use Scenario: Multiplexing stimulus signals across multiple DUT channels in automated boundary-scan test systems. IC Role / Device Role / Timing Role: High-speed, low-propagation-delay buffer enabling precise timing alignment of parallel test vectors. Use Value: Achieves sub-10 ns enable-to-output delay for synchronized multi-channel stimulus delivery. | Use Scenario: Driving high-current relay coils and LED status indicators from low-drive microcontroller GPIOs. IC Role / Device Role / Timing Role: Current-boosting buffer converting MCU logic outputs into 64-mA sink-capable control signals. Use Value: Directly drives electromechanical loads without external transistors, simplifying fixture design and improving reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126A | 3.3-V only supply (1.65–3.6 V); lower drive (±24 mA); CMOS input thresholds. | Not suitable for 5-V TTL systems; requires level translation if interfacing with 5-V logic. | Select only for pure 3.3-V domains where lower power and voltage scaling are priorities. |
| SN74AHCT126 | 5-V supply (4.5–5.5 V); TTL-compatible inputs; lower drive (±8 mA); slower propagation (typ. 8 ns). | Compatible pinout and voltage range but insufficient drive for heavy bus loads or long traces. | Choose when cost sensitivity outweighs drive strength and speed requirements in low-fanout applications. |
Compared with SN74LVC126A and SN74AHCT126, the SN74ABT126D uniquely combines 5-V TTL compatibility, ±32-mA/64-mA drive, and sub-7.5 ns propagation - making it optimal for demanding industrial bus isolation where signal integrity and hot-swap safety are non-negotiable.
Availability
SN74ABT126D is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ABT126D 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 ICs.
The ABT logic family - including the SN74ABT126D - was engineered for robust 5-V bus interfacing in harsh environments, emphasizing hot-swap readiness, noise immunity, and compatibility with legacy TTL infrastructure.
FAQ
What is the recommended power supply decoupling for SN74ABT126D?
Place a 0.1-µF ceramic capacitor between VCC (pin 14) and GND (pin 7), located within 5 mm of the SN74ABT126D package. For systems with high simultaneous switching noise, add a 4.7-µF bulk capacitor nearby. This minimizes supply ripple and suppresses ground bounce during fast output transitions - critical for maintaining SN74ABT126D signal integrity in dense PCB layouts.
Does SN74ABT126D support hot insertion without external circuitry?
Yes. The SN74ABT126D supports hot insertion via its built-in Ioff specification (±100 µA at VCC = 0) and power-up 3-state behavior below 2.1 V. When inserted into a live 5-V bus, all outputs remain high-impedance until VCC stabilizes, and Ioff prevents back-current flow - eliminating need for external pulldown resistors or sequencing controllers in compliant systems.
Can SN74ABT126D drive a 50-pF load with 5-ns rise time?
Yes. With 64-mA sink and −32-mA source capability, the SN74ABT126D achieves typical tPLH/tPHL of 2.5–4.9 ns into 50-pF loads at VCC = 5 V. Measured propagation delays remain under 7.3 ns across temperature and voltage extremes - confirming reliable 5-ns edge performance for moderate-length PCB traces and standard logic fanouts.
What is the maximum continuous output current rating for SN74ABT126D?
The absolute maximum continuous output current for SN74ABT126D is 128 mA per output (per datasheet Absolute Maximum Ratings). However, the recommended operating condition specifies 64 mA IOL and −32 mA IOH to ensure thermal stability and maintain VOH ≥ 2.0 V and VOL ≤ 0.55 V across −40°C to 85°C - the SN74ABT126D must not exceed these recommended limits for sustained operation.
How does SN74ABT126D handle unused inputs?
All unused inputs on the SN74ABT126D must be tied to either VCC or GND - floating inputs are prohibited. TI's SCBA004 application report confirms that unconnected inputs can cause increased ICC, oscillation, or excessive heating due to intermediate voltage states. For OE pins, tie to GND to disable the associated buffer; for A inputs, tie to GND or VCC depending on desired default output state - this ensures deterministic SN74ABT126D behavior and system reliability.
SN74ABT126D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74ABT126D FAQ
1.How can I place an order for SN74ABT126D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT126D 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 SN74ABT126D reliable?
The price and inventory of SN74ABT126D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT126D is usually 5 days.
3.What payment methods are accepted for SN74ABT126D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT126D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT126D?
SN74ABT126D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT126D 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 SN74ABT126D?
For technical support, including SN74ABT126D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT126D requirements.
6.How does Aetrix verify that SN74ABT126D is sourced from the original manufacturer or authorized distributors?
All SN74ABT126D 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 SN74ABT126D meets industry standards.
7.What is the process for return or replacement of SN74ABT126D?
All SN74ABT126D units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT126D, 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 SN74ABT126D part is unused and in its original packaging.
Return procedure for SN74ABT126D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ABT126D Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
