SN74AHC126PWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74AHC126PWG4 is a quad single-bit non-inverting three-state buffer in a 14-pin TSSOP package, part of the AHC CMOS logic family. It supports a 2 V to 5.5 V supply range, propagation delay under 6 ns at 5 V, and output drive current of 8 mA, targeting bus interface and signal isolation applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- SN74AHC126PWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74AHC126PWG4?
- 4-channel non-inverting three-state buffer with active-high output enables
- Supply range 2 V to 5.5 V for mixed-voltage bus interfaces
- Propagation delay as low as 5.5 ns at VCC = 5 V
- 8 mA output drive capability for bus loading
- AHC CMOS family with low power consumption and CMOS/TTL compatibility
- 14-pin TSSOP package for space-constrained PCB designs
What is SN74AHC126PWG4 used for?
The SN74AHC126PWG4 is commonly used in microprocessor address and data bus isolation, memory interface buffering, and FPGA I/O expansion circuits where three-state control is needed to multiplex multiple devices onto a shared bus. It also serves in level-shifting and signal fan-out applications in consumer electronics, industrial controllers, and communication equipment operating from 3.3 V or 5 V supplies.
What are the specifications of SN74AHC126PWG4?
| YTEOL | 0 |
| Control Type | ENABLE HIGH |
| Count Direction | UNIDIRECTIONAL |
| Family | AHC/VHC/H/U/V |
| JESD-30 Code | R-PDSO-G14 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.008A |
| Number of Bits | 1 |
| Number of Functions | 4 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.04mA |
| Prop. Delay@Nom-Sup | 8.5ns |
| Propagation Delay (tpd) | 13ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74AHC126PWG4 datasheet?
SN74AHC126PWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74AHC126PWG4?
Compatible alternatives and drop-in replacements for SN74AHC126PWG4:
Bus Driver, AHC/VHC/H/U/V Series, 4-Func, 1-Bit, True Output, CMOS, PDSO14
Bus Driver, AHC/VHC/H/U/V Series, 4-Func, 1-Bit, True Output, CMOS, PDSO14
Bus Driver, AHC/VHC/H/U/V Series, 4-Func, 1-Bit, True Output, CMOS, PDSO14
Bus Driver, AHC/VHC/H/U/V Series, 4-Func, 1-Bit, True Output, CMOS, PDSO14
Frequently Asked Questions
What supply voltage range does the SN74AHC126PWG4 support for mixed-voltage bus designs?
The SN74AHC126PWG4 operates from 2 V to 5.5 V, making it compatible with both 3.3 V and 5 V bus systems and allowing direct interfacing between microcontrollers and legacy 5 V peripherals without additional level-shifting components.
How fast can the SN74AHC126PWG4 switch signals on a high-speed data bus?
At VCC = 5 V, propagation delay is typically 5.5 ns with a 50 pF load, and output rise/fall times are below 6 ns, enabling reliable signal integrity on buses clocked at frequencies up to 80 MHz in typical PCB environments.
For a 4-device shared bus, how does the three-state control on the SN74AHC126PWG4 prevent bus contention?
Each of the 4 channels has an independent active-high output-enable pin; when pulled low, the corresponding output enters a high-impedance state, preventing bus contention when multiple drivers share a common 8-bit or 16-bit data bus in microprocessor systems.
How much output drive current can the SN74AHC126PWG4 supply to downstream loads?
The device delivers 8 mA sink and source current per channel, which is sufficient to drive standard CMOS and TTL inputs with a fan-out of up to 10 AHC gates or 4 LSTTL loads at the rated 50 pF capacitive loading specification.
Which package does the SN74AHC126PWG4 use and how does it affect PCB layout density?
The device comes in a 14-pin TSSOP package with 0.65 mm pin pitch, occupying approximately 5 mm x 4.4 mm of board area, which is about 40% smaller than an equivalent SOIC-14 footprint and enables higher logic density in compact PCB designs.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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