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Texas Instruments SN74ABT126PWRG4
- Part No.:
- SN74ABT126PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT126PWRG4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,848
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Product details
Overview
SN74ABT126PWRG4 from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for bidirectional data bus isolation and level translation in 5-V TTL systems. It features independent output-enable control per channel, high-drive capability (−32 mA IOH / 64 mA IOL), low ground bounce (<1 V), and power-up/power-down high-impedance protection - enabling safe hot insertion in backplane and modular computing applications.
For engineers reviewing the SN74ABT126PWRG4 datasheet, SN74ABT126PWRG4 pinout, SN74ABT126PWRG4 application, or SN74ABT126PWRG4 equivalent, key selection criteria include guaranteed 3-state behavior during VCC ramp (0–2.1 V), ±100 µA Ioff at 0 V, latch-up immunity >500 mA, and compatibility with 14-pin TSSOP (PW) layout constraints including thermal pad soldering requirements.
Technical Context
This device implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) input controlling its 3-state output. The ABT logic family uses bipolar-TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and delivers rail-to-rail CMOS-compatible output swing under load.
Its internal architecture ensures simultaneous high-impedance state entry on power-up/down via internal voltage-sensing circuitry, while Ioff support prevents current backflow when VCC = 0 V - critical for partial-power-down system partitioning and hot-swap compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - operates only in standard 5-V TTL supply domain; not 3.3-V compatible. |
| IOH / IOL | −32 mA / 64 mA - drives heavy capacitive loads (e.g., >100 pF buses) without signal degradation. |
| tPLH / tPHL | 1 ns to 7.3 ns - supports >100 MHz bus toggle rates in short-trace configurations. |
| VOL / VOH | 0.55 V @ 64 mA / 2.0 V @ −32 mA - meets TTL output voltage specs under full drive conditions. |
| Ioff | ±100 µA @ VCC = 0 - blocks leakage between powered and unpowered subsystems during hot insertion. |
| ESD Rating | 2000-V HBM, 200-V MM - exceeds JEDEC JESD22-A114/A115 for board-level handling robustness. |
| θJA (PW) | 113°C/W - requires thermal pad connection and PCB copper area for sustained 64-mA per-output operation. |
Pinout & Package
TSSOP-14 (PW) package: 5.0 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, exposed thermal pad (must be soldered to PCB ground plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (active-low) | Independent enable control per buffer; must be ≤0.8 V to assert output. |
| 2, 5, 11, 14 | A (input) | Noninverting data input; TTL-compatible thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V). |
| 3, 6, 12, 9 | Y (output) | 3-state buffered output; high-Z when OE = high or VCC < 2.1 V. |
| 7 | GND | Power return reference; connects to PCB ground plane and thermal pad. |
| 14 | VCC | 5-V supply; decoupling capacitor (0.1 µF) required within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Hot-insertion support | Ioff and power-up 3-state ensure no backfeed or bus contention during live module insertion. |
| Output ground bounce suppression | VOLP < 1 V at 5 V/25°C enables clean signal integrity on shared ground planes. |
| Latch-up immunity | Exceeds 500 mA per JESD17 - survives transient overcurrent events in industrial environments. |
| Input transition rate tolerance | Δt/Δv ≤ 10 ns/V - accepts slow-rising control signals without false triggering. |
| Power-up ramp rate support | Δt/ΔVCC ≥ 200 μs/V - accommodates gradual supply sequencing in multi-rail systems. |
Applications
| Backplane Data Isolation | Modular Computing Backplane |
|---|---|
Use Scenario: Isolating CPU-to-peripheral data lanes across removable card slots in telecom shelf systems. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling dynamic bus arbitration and slot power sequencing. Use Value: Prevents bus contention during card insertion/removal and maintains signal integrity at 50+ MHz toggle rates. | Use Scenario: Buffering address/data lines between mainboard and hot-pluggable I/O modules in industrial PLC racks. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening interface between 5-V controller and distributed peripheral buses. Use Value: Delivers 64-mA sink current to drive long traces and multiple TTL inputs without added line drivers. |
| Legacy System Bus Extension | Test Equipment Signal Gating |
Use Scenario: Extending ISA or VMEbus segments with additional slot capacity while preserving timing margins. IC Role / Device Role / Timing Role: Low-propagation-delay (≤7.3 ns) repeater maintaining setup/hold timing across extended trace lengths. Use Value: Enables 100+ mm trace extensions without violating 5-V TTL timing budgets. | Use Scenario: Enabling/disabling DUT signal paths during automated test sequences in ATE systems. IC Role / Device Role / Timing Role: Precision-controlled gating element with sub-5 ns enable/disable transitions (tPZL/tPHZ). Use Value: Reduces test pattern switching noise by isolating unused channels during vector execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244PWR | Octal (8-channel), same ABT family, identical VCC/I/O specs but larger PW-20 package. | Higher channel count; requires PCB redesign for pin count and layout. | Select when system needs ≥8 isolated data lines and board space allows 20-pin TSSOP. |
| SN74LVC126APWR | 3.3-V only (1.65–3.6 V), lower drive (−24/24 mA), no Ioff or hot-insertion support. | Not suitable for 5-V or hot-swap use; limited to low-voltage logic domains. | Choose only for 3.3-V-only systems where ABT-level drive and robustness are unnecessary. |
Compared with SN74ABT244PWR and SN74LVC126APWR, the SN74ABT126PWRG4 uniquely balances 4-channel density, 5-V TTL compatibility, hot-insertion safety, and industrial-grade latch-up immunity - making it optimal for space-constrained 5-V modular backplanes requiring field-replaceable modules.
Availability
SN74ABT126PWRG4 is available at Aetrix Electronics and suitable for backplane data isolation, modular computing backplane interfaces, legacy system bus extension, and test equipment signal gating requiring stable component supply and long-term industrial availability.
Supply support for SN74ABT126PWRG4 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 SN74ABT126PWRG4 belongs to TI's ABT logic family - engineered specifically for high-noise-margin, high-drive 5-V TTL bus interfacing in mission-critical industrial and telecom infrastructure.
FAQ
What is the maximum operating temperature range for the SN74ABT126PWRG4?
The SN74ABT126PWRG4 is rated for operation from −40°C to +85°C ambient temperature. This industrial temperature grade is confirmed in TI's official packaging addendum and applies to all PW-package variants including SN74ABT126PWRG4. Operation outside this range may result in parametric shift or functional failure.
Does the SN74ABT126PWRG4 support 3.3-V input logic levels?
No, the SN74ABT126PWRG4 does not reliably accept 3.3-V inputs as valid logic-high signals. Its VIH minimum is 2.0 V at VCC = 4.5 V, but the ABT family is designed for 5-V TTL signaling; 3.3-V logic sources may fail to meet the 2.0-V threshold under worst-case conditions. For mixed-voltage systems, level translators or LVC-family alternatives are recommended instead of relying on SN74ABT126PWRG4.
Is the thermal pad on the SN74ABT126PWRG4 package required to be soldered?
Yes, the exposed thermal pad on the SN74ABT126PWRG4 (TSSOP-PW) package must be soldered to a PCB ground plane. TI's package documentation specifies that thermal performance (θJA = 113°C/W) and mechanical reliability depend on this connection. Omitting the thermal pad solder joint risks exceeding junction temperature limits under sustained 64-mA output loading.
Can the SN74ABT126PWRG4 be used in hot-swap applications without external circuitry?
Yes - the SN74ABT126PWRG4 supports hot insertion natively via two features: Ioff (±100 µA at VCC = 0 V) prevents back-current flow, and automatic high-impedance state activation when VCC is between 0 and 2.1 V. No external pulldown resistors or sequencing controllers are needed, though TI recommends tying OE to GND through a resistor (>10 kΩ) above 2.1 V for guaranteed disable.
What is the pin 1 marking convention for the SN74ABT126PWRG4?
The SN74ABT126PWRG4 uses a standard TSSOP dot-and-notch orientation: pin 1 is located at the end of the package with a small circular mark (dot) adjacent to the notch on the top surface. This matches TI's PW-package drawing PW0014A and is verified in the tape-and-reel quadrant assignment data, where all PW variants (including SN74ABT126PWRG4) are assigned to Quadrant Q1 for pin-1 orientation.
SN74ABT126PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm 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-TSSOP
SN74ABT126PWRG4 FAQ
1.How can I place an order for SN74ABT126PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT126PWRG4 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 SN74ABT126PWRG4 reliable?
The price and inventory of SN74ABT126PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT126PWRG4 is usually 5 days.
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SN74ABT126PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT126PWRG4 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 SN74ABT126PWRG4?
For technical support, including SN74ABT126PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT126PWRG4 requirements.
6.How does Aetrix verify that SN74ABT126PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT126PWRG4 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 SN74ABT126PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT126PWRG4?
All SN74ABT126PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT126PWRG4, 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 SN74ABT126PWRG4 part is unused and in its original packaging.
Return procedure for SN74ABT126PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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