74AHCT1G126DBVT Texas Instruments Integrated Circuit (SOT23 (5-Pin)) In Stock
The 74AHCT1G126DBVT is a single-channel, 3-state buffer and line driver from Texas Instruments operating from a 5 V supply with AHCT-level inputs. It delivers up to 8 mA output drive in a tiny 5-pin SOT-23 package, making it ideal for bus isolation, level translation, and signal buffering on space-constrained PCBs.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- 74AHCT1G126DBVT Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of 74AHCT1G126DBVT?
- 3-state output with active-high output enable allows the buffer to be disconnected from the bus when OE is low, enabling true bus multiplexing without contention
- AHCT logic family accepts standard CMOS/TTL input levels at 5 V VCC, providing direct compatibility with 3.3 V CMOS inputs and legacy 5 V TTL signals
- 8 mA output drive current sustains signal integrity on PCB traces up to 10 cm at 100 MHz without an external series resistor
- 5-pin SOT-23 package occupies less than 3 mm² board area—ideal for pin-constrained designs in wearables, IoT modules, and dense logic arrays
- Wide operating temperature range of -40 °C to +125 °C qualifies the device for automotive, industrial, and outdoor equipment applications
What is 74AHCT1G126DBVT used for?
The 74AHCT1G126DBVT is commonly used to buffer and level-shift control signals between a 3.3 V microcontroller and a 5 V peripheral bus, preventing loading of the MCU output while driving up to 8 mA into the bus. It also serves as a simple bus-isolation gate in multi-master I/O expander designs where the 3-state output can disconnect a node from a shared data line under firmware control. Automotive interior electronics and industrial sensor interfaces rely on its -40 °C to +125 °C rating and AHCT noise-margin characteristics to maintain reliable signal buffering across harsh temperature cycles.
What are the specifications of 74AHCT1G126DBVT?
| YTEOL | EYTEOL |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Country of Origin | Country of Origin |
Where can I find the 74AHCT1G126DBVT datasheet?
74AHCT1G126DBVT Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for 74AHCT1G126DBVT?
Compatible alternatives and drop-in replacements for 74AHCT1G126DBVT:
Bus Driver, AHCT/VHCT/VT Series, 1-Func, 1-Bit, True Output, CMOS, PDSO5
Bus Driver, AHCT/VHCT/VT Series, 1-Func, 1-Bit, True Output, CMOS, PDSO5
Bus Driver, AHCT/VHCT/VT Series, 1-Func, 1-Bit, True Output, CMOS, PDSO5
Bus Driver, AHCT/VHCT/VT Series, 1-Func, 1-Bit, True Output, CMOS, PDSO5
Bus Driver, AHCT/VHCT/VT Series, 1-Func, 1-Bit, True Output, CMOS, PDSO5
Bus Driver, AHCT/VHCT/VT Series, 1-Func, 1-Bit, True Output, CMOS, PDSO5
Bus Driver, AHCT/VHCT/VT Series, 1-Func, 1-Bit, True Output, CMOS, PDSO5
Frequently Asked Questions
How does the 3-state output of 74AHCT1G126DBVT enable bus-sharing between multiple drivers?
When the active-high output-enable (OE) pin is driven low, the 74AHCT1G126DBVT output enters a high-impedance state, effectively disconnecting the buffer from the bus. This lets two or more drivers share a single 5 V signal line—for example, two microcontrollers alternately driving an SPI MOSI bus—without bus contention, provided firmware ensures only one OE is asserted high at a time.
What input voltage levels does the 74AHCT1G126DBVT accept, and how does that help with 3.3 V to 5 V level translation?
The AHCT family input threshold accepts VIH ≥ 2.0 V and VIL ≤ 0.8 V, matching standard CMOS and TTL levels. A 3.3 V CMOS output driving 2.4 V HIGH comfortably exceeds the 2.0 V threshold, allowing the 74AHCT1G126DBVT running on 5 V VCC to translate the signal to a full 5 V swing on its output—all without any external resistors or dedicated level-translator ICs.
What output drive current can the 74AHCT1G126DBVT supply, and how does that affect PCB trace length?
The device sinks and sources up to 8 mA. For a 100 Ω characteristic-impedance PCB trace at 3.3 V logic, 8 mA of drive ensures a steady-state voltage of at least 2.4 V at 10 cm trace length with a 50 Ω series termination, maintaining valid logic HIGH with margin. Traces beyond 15 cm at frequencies above 50 MHz may benefit from a 33 Ω series damping resistor to suppress reflections.
Over what temperature range does the 74AHCT1G126DBVT operate, and which end-markets does that cover?
The device is rated -40 °C to +125 °C junction temperature. This range satisfies AEC-Q100 Grade 1 automotive requirements for interior modules, meets IEC 61010 industrial equipment standards, and covers outdoor IoT enclosures exposed to full seasonal temperature swings. It also qualifies for military-grade designs that require extended temperature operation without derating.
How compact is the 74AHCT1G126DBVT footprint, and what should designers know about placing it near sensitive analog circuitry?
The 5-pin SOT-23 package measures approximately 2.9 mm × 1.6 mm, occupying under 5 mm² of PCB area. Because the AHCT output switches 8 mA at rise times below 5 ns, designers should place a 100 nF decoupling capacitor within 1 mm of the VCC pin and route the output trace away from high-impedance analog nodes to prevent coupling of 150 mV to 200 mV switching transients into sensitive sensor front-ends.
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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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