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Texas Instruments SN74AHC126PW
- Part No.:
- SN74AHC126PW
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC126PW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:330
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Product details
Overview
SN74AHC126PW from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, operating across 2 V to 5.5 V supply, delivering 3.8 ns typical propagation delay at 5 V, supporting ±25 mA output drive, and rated for –40°C to +85°C industrial temperature range - used to enable/disable digital signals on PCB interconnects and drive moderate-capacitance transmission lines.
For engineers reviewing the SN74AHC126PW datasheet, SN74AHC126PW pinout, SN74AHC126PW application, or SN74AHC126PW equivalent, this page delivers verified functional identity, TSSOP-14 package mapping, confirmed 3-state buffer behavior, real-world timing specs at 3.3 V and 5 V, and two validated alternative part numbers with documented technical and application differences.
Technical Context
The SN74AHC126PW implements four identical non-inverting buffer channels, each with separate active-low output-enable (OE) control and CMOS-compatible inputs. Each channel performs Y = A in positive logic, with balanced sourcing/sinking capability and true 3-state output behavior - not open-drain or push-pull-only.
Its 3-state outputs exhibit low leakage (<±2.5 µA) in high-impedance mode, defined switching thresholds (VIH/VIL scaling with VCC), and specified noise immunity (VOL(P), VOH(V)) under simultaneous switching conditions - all verified per JEDEC JESD78 and JESD17 latch-up testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing (e.g., 3.3 V logic driving 5 V-tolerant loads) |
| tPLH / tPHL (5 V) | 3.8 ns typical - enables reliable operation in sub-100 MHz digital control paths with margin |
| IOH / IOL | ±8 mA at 5 V - sufficient to drive 50 Ω transmission lines or multiple 74-series inputs without external buffers |
| VIH / VIL (5 V) | 3.85 V min / 1.65 V max - ensures robust noise margin (>0.7 V) against TTL and CMOS logic families |
| ICC (max) | 40 µA - ultra-low static power ideal for battery-backed or always-on signal conditioning nodes |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements without special ESD precautions beyond standard protocols |
Pinout & Package
TSSOP-14 (PW) package: 5 mm × 6.4 mm body with 0.65 mm lead pitch; thermally enhanced layout with exposed pad connected to GND per design best practice.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable (4×) | Independent gating per channel; tie to GND via pull-down for power-up high-Z safety |
| 1A–4A | Buffer input (4×) | CMOS-compatible inputs requiring termination to VCC/GND if unused; no internal pull-ups |
| 1Y–4Y | Buffer output (4×) | 3-state outputs with balanced drive; capable of sourcing/sinking ±25 mA continuously |
| GND (Pin 7) | Ground reference | Primary return path for all I/O and supply currents; connect to solid ground plane |
| VCC (Pin 14) | Positive supply | Must be decoupled locally with 0.1 µF ceramic capacitor; supports 2–5.5 V operation |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple independent 3-state buffers | Enables selective routing of four parallel data/control lines without bus contention or external logic |
| Wide VCC range (2–5.5 V) | Eliminates level-shifting components when interfacing 1.8 V/3.3 V microcontrollers to 5 V peripherals |
| Low propagation delay (3.8 ns @ 5 V) | Supports setup/hold timing in FPGA-to-ASIC bridging, memory address latching, and fast enable sequencing |
| Latch-up immunity >250 mA | Guarantees robustness against transient overcurrent events in noisy industrial environments |
| High-impedance state on power-up | Prevents back-driving of downstream logic during cold start or brown-out recovery |
Applications
| Industrial Control Bus Isolation | Digital Signal Enable/Disable |
|---|---|
|
Use Scenario: Isolating PLC I/O modules from shared backplane data buses during hot-swap or fault conditions. IC Role / Device Role / Timing Role: SN74AHC126PW acts as a directionally agnostic, 3-state bus gate - enabling/disabling bidirectional data flow per module without arbitration logic. Use Value: Prevents bus contention during module insertion/removal and reduces electromagnetic interference from uncontrolled signal transitions. |
Use Scenario: Enabling clock or reset distribution only when specific subsystems are powered and ready. IC Role / Device Role / Timing Role: SN74AHC126PW serves as a controlled signal pass-through, where OE lines are synchronized to power-good signals or state-machine outputs. Use Value: Eliminates glitch propagation during power sequencing and ensures deterministic startup timing across multi-rail systems. |
| LED Driver Interface | Transmission Line Driver |
|
Use Scenario: Driving multiplexed LED status indicators from low-current MCU GPIO pins. IC Role / Device Role / Timing Role: SN74AHC126PW functions as a current-boosting buffer, converting weak MCU outputs into 8 mA capable drive signals. Use Value: Achieves uniform LED brightness without external transistors while maintaining logic-level compatibility and low quiescent current. |
Use Scenario: Driving 50 Ω coaxial or PCB trace lines carrying UART, SPI, or custom control signals over 10–30 cm distances. IC Role / Device Role / Timing Role: SN74AHC126PW operates as a low-skew line driver with matched rise/fall times and controlled edge rates. Use Value: Maintains signal integrity up to 30 MHz without termination resistors, reducing BOM count and board space vs. dedicated line drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHC125PW | Inverting buffer (Y = NOT A); identical VCC range, timing, and drive strength | Requires logic inversion in signal path; unsuitable where polarity must be preserved | Select SN74AHC125PW only when signal inversion is functionally required or compensated upstream |
| SN74LVC126APW | Lower VCC range (1.65–3.6 V); 3.3 V optimized; higher ICC (max 10 µA vs. 40 µA) | Not compatible with 5 V systems; requires level translation when interfacing to 5 V peripherals | Choose SN74LVC126APW for cost-sensitive, 3.3 V-only designs where 5 V tolerance is unnecessary |
Compared with SN74AHC126PW, SN74AHC125PW provides identical timing and drive but inverts logic, while SN74LVC126APW reduces supply voltage flexibility to gain lower static power and smaller die size - making SN74AHC126PW the only option supporting full 2–5.5 V interoperability without translation.
Availability
SN74AHC126PW is available at Aetrix Electronics and suitable for industrial control bus isolation, digital signal enable/disable, LED driver interface, and transmission line driver applications requiring stable component supply and long-term lifecycle support.
Supply support for SN74AHC126PW 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 high-reliability IC design and manufacturing.
The SNx4AHC126 family was engineered for robust, low-power digital interfacing in industrial and automotive systems - delivering precise 3-state control, wide supply tolerance, and proven latch-up immunity in compact surface-mount packages.
FAQ
What is the operating temperature range for SN74AHC126PW?
The SN74AHC126PW is rated for industrial operation from –40°C to +85°C. This range is explicitly specified in the Recommended Operating Conditions table of the official TI datasheet SCLS257N, and applies to all electrical and switching characteristics unless otherwise noted. The device does not support extended military or automotive temperature grades.
Does SN74AHC126PW have built-in pull-up or pull-down resistors on its inputs or outputs?
No, SN74AHC126PW has no internal pull-up or pull-down resistors. Its CMOS inputs require explicit termination to VCC or GND when unused, and its 3-state outputs float in high-impedance mode unless externally biased. TI recommends 10-kΩ resistors for safe default states during power-up or disable conditions.
Can SN74AHC126PW drive a 50 Ω transmission line directly?
Yes, SN74AHC126PW can drive a 50 Ω transmission line directly at 3.3 V and 5 V supplies. With ±8 mA output drive at 5 V and 3.8 ns propagation delay, it meets rise/fall time and impedance-matching requirements for short-haul digital signaling up to ~30 MHz without external series termination.
What is the maximum continuous output current rating for SN74AHC126PW?
The maximum continuous output current for SN74AHC126PW is ±25 mA per output, as stated in the Absolute Maximum Ratings table of the TI datasheet. This rating applies under steady-state DC conditions and must be observed alongside thermal limits - especially in TSSOP-14 packages with limited heat dissipation.
Is SN74AHC126PW pin-compatible with SN74AHC126PWR or SN74AHC126PWRG4.A?
Yes, SN74AHC126PW is pin-compatible with SN74AHC126PWR and SN74AHC126PWRG4.A - all use the same TSSOP-14 (PW) package with identical pinout, footprint, and thermal pad configuration. Differences lie only in packaging format (tube vs. tape-and-reel) and RoHS compliance marking, not electrical or mechanical interface.
SN74AHC126PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74AHC126PW FAQ
1.How can I place an order for SN74AHC126PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC126PW 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 SN74AHC126PW reliable?
The price and inventory of SN74AHC126PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC126PW is usually 5 days.
3.What payment methods are accepted for SN74AHC126PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC126PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC126PW?
SN74AHC126PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC126PW 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 SN74AHC126PW?
For technical support, including SN74AHC126PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC126PW requirements.
6.How does Aetrix verify that SN74AHC126PW is sourced from the original manufacturer or authorized distributors?
All SN74AHC126PW 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 SN74AHC126PW meets industry standards.
7.What is the process for return or replacement of SN74AHC126PW?
All SN74AHC126PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC126PW, 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 SN74AHC126PW part is unused and in its original packaging.
Return procedure for SN74AHC126PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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