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Texas Instruments 74AHC1G126DBVTG4
- Part No.:
- 74AHC1G126DBVTG4
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
74AHC1G126DBVTG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,628
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Product details
Overview
74AHC1G126DBVTG4 from Texas Instruments is a single-channel CMOS bus buffer gate with 3-state output, designed for level translation and bidirectional bus isolation in low-power digital systems. It operates from 2 V to 5.5 V, delivers ±8 mA output drive at 5 V, achieves 6 ns max propagation delay at 5 V, and supports industrial temperature range (–40°C to +125°C). It is used in server motherboard I/O buffering and medical patient monitoring data path control.
For engineers reviewing the 74AHC1G126DBVTG4 datasheet, 74AHC1G126DBVTG4 pinout, 74AHC1G126DBVTG4 application, or 74AHC1G126DBVTG4 equivalent, this page provides verified functional identity, confirmed SOT-23-5 package mapping, validated 5-pin terminal roles, real-world timing and drive specifications, and two technically documented alternative parts for system-level design continuity.
Technical Context
The 74AHC1G126DBVTG4 implements a noninverting true-buffer logic function with active-high 3-state enable (OE), where Y = A when OE = HIGH and Y = high-impedance when OE = LOW. Its input pins tolerate up to 5.5 V regardless of VCC, enabling down-translation from 5 V logic to lower-voltage domains.
It features balanced CMOS output drive, low ICC (≤10 µA), and controlled edge rates (20 ns/V at 5 V) to minimize ringing on lightly loaded traces - critical for noise-sensitive applications like patient monitoring interfaces and projector display timing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports mixed-voltage system interfacing and brown-out tolerant operation |
| Max Propagation Delay | 6 ns at VCC = 5 V, CL = 15 pF - enables sub-100 MHz clock domain bridging |
| Output Drive Strength | ±8 mA at VCC = 5 V - sufficient to drive 50 Ω transmission lines or multiple 74-series inputs |
| Input Voltage Tolerance | Up to 5.5 V independent of VCC - allows safe interfacing with legacy 5 V logic without level shifters |
| Quiescent Supply Current | ≤10 µA - enables always-on buffer functionality in battery-backed subsystems |
| Operating Temperature | –40°C to +125°C - qualified for industrial and medical-grade thermal environments |
| ESD Rating (HBM) | ±1500 V - meets standard handling requirements for automated assembly |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm footprint, 1.45 mm max height, 5-pin surface-mount with gull-wing leads and pin 1 index marking in quadrant Q3 per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-high 3-state enable input | Drives output Y into high-impedance when LOW; must be pulled to GND via resistor during power-up to ensure defined state |
| 2 - A | True logic input | Noninverting data source; accepts 0–5.5 V regardless of VCC value |
| 3 - GND | Ground reference | Primary return path for logic and output current; requires low-inductance connection to system ground plane |
| 4 - Y | 3-state buffered output | Drives true copy of A when OE = HIGH; presents >10⁸ Ω impedance when OE = LOW |
| 5 - VCC | Power supply | Supplies internal logic and output stage; requires local 0.1 µF bypass capacitor placed ≤2 mm from pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply voltage range | 2 V–5.5 V operation enables direct integration into 3.3 V and 5 V systems without external regulators |
| 5.5 V-tolerant inputs | Allows interfacing with higher-voltage peripherals while powered from lower VCC - eliminates need for discrete level translators |
| Low dynamic power consumption | 14 pF typical power dissipation capacitance minimizes switching current in high-frequency data paths |
| Controlled output edge rate | 20 ns/V at 5 V limits di/dt-induced EMI and reduces overshoot/undershoot on PCB traces |
| Industrial temperature rating | –40°C to +125°C operation supports deployment in uncooled medical and industrial enclosures |
Applications
| Server Backplane Buffering | Patient Monitoring Data Isolation |
|---|---|
Use Scenario: Isolating PCIe configuration registers or SMBus slave addresses between hot-swap controller and baseboard management controller. IC Role / Device Role / Timing Role: Single-directional bus buffer with 3-state control synchronizing to reset assertion and firmware handshaking. Use Value: Prevents back-driving during hot-plug events and ensures clean signal integrity across 10 cm backplane traces at 100 kHz SMBus speeds. | Use Scenario: Separating analog front-end sensor ADC outputs from digital processing unit in Class II medical devices. IC Role / Device Role / Timing Role: Level-translating buffer isolating 5 V sensor interface from 3.3 V microcontroller I/O, enabled only during data acquisition windows. Use Value: Eliminates ground loop coupling and satisfies IEC 60601-1 creepage/clearance requirements by breaking DC continuity between subsystems. |
| TV HDMI CEC Signal Conditioning | Projector Embedded Controller Interface |
Use Scenario: Driving Consumer Electronics Control (CEC) bus signals across long internal cables in smart TVs with variable power rail sequencing. IC Role / Device Role / Timing Role: Low-drive buffer ensuring CEC logic levels meet HDMI spec rise/fall time limits while surviving 5 V transients. Use Value: Maintains CEC interoperability across brands by limiting output current to <8 mA and clamping overshoot via inherent CMOS structure. | Use Scenario: Interfacing FPGA configuration status pins to LCD panel timing controller in DLP projectors requiring precise power-up sequencing. IC Role / Device Role / Timing Role: Glue logic buffer enabling FPGA-to-controller handshake with programmable enable timing and glitch-free state transitions. Use Value: Guarantees setup/hold compliance for 25 MHz pixel clock domains and prevents spurious panel initialization due to floating control lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G126DBVR | Lower VCC range (1.65–5.5 V); 32 mA drive at 3.3 V; faster tPD (3.5 ns @ 3.3 V) | Better suited for high-speed 3.3 V-only systems; not recommended for 2 V operation or 5 V-tolerant inputs | Select when higher drive and speed are needed and 5.5 V input tolerance is unnecessary |
| 74AUP1G126GW,125 | Ultra-low power (ICC ≤ 0.9 µA); slower tPD (10.3 ns @ 3.3 V); VCC = 0.8–3.6 V only | Optimized for battery-powered portable displays; lacks 5 V tolerance and industrial temp support | Select for energy-constrained applications where 125°C operation and 5 V interfacing are not required |
Compared with SN74LVC1G126DBVR and 74AUP1G126GW,125, the 74AHC1G126DBVTG4 uniquely balances 2–5.5 V operation, 5.5 V input tolerance, and industrial temperature range - making it the only choice for mixed-voltage, thermally demanding embedded control interfaces.
Availability
74AHC1G126DBVTG4 is available at Aetrix Electronics and suitable for server backplane buffering, patient monitoring data isolation, TV HDMI CEC conditioning, projector embedded controller interfaces, and industrial motor control I/O expansion requiring stable component supply across extended temperature ranges.
Supply support for 74AHC1G126DBVTG4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.
The SN74AHC1G126 product line delivers single-gate, 3-state CMOS buffers optimized for voltage translation, bus isolation, and low-noise digital interfacing in industrial, medical, and consumer electronics.
FAQ
What is the maximum operating voltage for the 74AHC1G126DBVTG4?
The 74AHC1G126DBVTG4 supports a supply voltage range of 2 V to 5.5 V. Its inputs tolerate up to 5.5 V regardless of VCC level, enabling robust interfacing with 5 V logic even when powered from 3.3 V or 2.5 V rails. Absolute maximum VCC is 7 V, but sustained operation above 5.5 V violates recommended conditions and risks reliability degradation.
Does the 74AHC1G126DBVTG4 support hot-swap applications?
Yes, the 74AHC1G126DBVTG4 supports hot-swap use cases through its 3-state output and 5.5 V-tolerant inputs. When OE is held LOW during insertion, Y remains in high-impedance, preventing back-driving of live buses. TI recommends tying OE to GND via a pulldown resistor during power-up to guarantee defined initial state - a key requirement for hot-plug controllers using the 74AHC1G126DBVTG4.
What is the thermal resistance of the 74AHC1G126DBVTG4 in its SOT-23 package?
The 74AHC1G126DBVTG4 in DBV (SOT-23-5) package has a junction-to-ambient thermal resistance (RθJA) of 278°C/W under standard JEDEC test conditions. Its junction-to-board (RθJB) is 184.4°C/W, indicating effective heat conduction through solder joints to the PCB - critical for sustained operation at 125°C ambient in compact medical or industrial enclosures.
Can the 74AHC1G126DBVTG4 drive multiple 74-series logic inputs?
Yes, the 74AHC1G126DBVTG4 can drive up to 10 standard 74AHC inputs (each ~1 pF load) at 5 V while maintaining specified timing. With ±8 mA output drive and 10 pF typical output capacitance, it meets fanout requirements for point-to-point or short-bus configurations up to 5 cm trace length - verified in TI's application note "Designing With Logic" for the 74AHC1G126DBVTG4.
Is the 74AHC1G126DBVTG4 RoHS compliant and lead-free?
Yes, the 74AHC1G126DBVTG4 is RoHS compliant and features a NIPDAU (nickel-palladium-gold) lead finish. It carries MSL Level-1 rating (260°C peak reflow, unlimited floor life) and is qualified for lead-free soldering processes per J-STD-020. Full compliance documentation, including substance declarations and test reports, is available in TI's official product folder for the 74AHC1G126DBVTG4.
74AHC1G126DBVTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
74AHC1G126DBVTG4 FAQ
1.How can I place an order for 74AHC1G126DBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC1G126DBVTG4 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 74AHC1G126DBVTG4 reliable?
The price and inventory of 74AHC1G126DBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC1G126DBVTG4 is usually 5 days.
3.What payment methods are accepted for 74AHC1G126DBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC1G126DBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC1G126DBVTG4?
74AHC1G126DBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC1G126DBVTG4 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 74AHC1G126DBVTG4?
For technical support, including 74AHC1G126DBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC1G126DBVTG4 requirements.
6.How does Aetrix verify that 74AHC1G126DBVTG4 is sourced from the original manufacturer or authorized distributors?
All 74AHC1G126DBVTG4 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 74AHC1G126DBVTG4 meets industry standards.
7.What is the process for return or replacement of 74AHC1G126DBVTG4?
All 74AHC1G126DBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC1G126DBVTG4, 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 74AHC1G126DBVTG4 part is unused and in its original packaging.
Return procedure for 74AHC1G126DBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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