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Texas Instruments 74AHC1G126DCKTE4
- Part No.:
- 74AHC1G126DCKTE4
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
74AHC1G126DCKTE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,140
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Product details
Overview
74AHC1G126DCKTE4 from Texas Instruments is a single-channel CMOS bus buffer gate with 3-state output, designed for level-shifting 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 3.8 ns typical propagation delay (tPLH/tPHL) at 5 V, and supports industrial temperature range (–40°C to +125°C). It is used in server backplane interface logic and medical patient monitoring I/O expansion.
For engineers reviewing the 74AHC1G126DCKTE4 datasheet, 74AHC1G126DCKTE4 pinout, 74AHC1G126DCKTE4 application, or 74AHC1G126DCKTE4 equivalent, this page provides verified functional specifications, SC-70 package layout details, real-world use cases in TV and projector video signal routing, and validated alternative parts for supply continuity planning.
Technical Context
The 74AHC1G126DCKTE4 implements true non-inverting logic with active-high output enable (OE), enabling precise control of data flow on shared buses. Its 5-pin SC-70 package integrates GND, VCC, input A, output Y, and OE - all defined per JEDEC MO-187 standard.
It features 5.5-V-tolerant inputs across its full 2–5.5 V supply range, allowing down-translation from higher-voltage logic domains into 3.3 V or 2.5 V subsystems without external level shifters. Output high-impedance state leakage is limited to ±2.5 µA over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - enables interoperability across 2.5 V, 3.3 V, and 5 V logic families |
| Max Propagation Delay | 7 ns at 5 V, CL = 15 pF - ensures timing compliance in sub-100 MHz synchronous bus interfaces |
| Output Drive Strength | ±8 mA at 5 V - sufficient to drive 50 Ω transmission lines or multiple 74AHC inputs without fanout limitation |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - supports mixed-supply system interfacing without clamping diodes |
| Quiescent Supply Current | 10 µA max - minimizes standby power in battery-backed or energy-sensitive applications |
| Operating Temperature | –40°C to +125°C - qualified for industrial and medical equipment environments |
| ESD Rating (HBM) | ±1500 V - meets standard handling requirements for automated assembly and field service |
Pinout & Package
74AHC1G126DCKTE4 uses the SC-70 (DCK) 5-pin surface-mount package, measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), with gull-wing leads and JEDEC-compliant pin 1 orientation (Q3 quadrant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-High Output Enable | Drives Y to high-impedance when low; must be pulled low via resistor during power-up to prevent bus contention |
| 2 (A) | True Logic Input | Accepts 5.5 V-tolerant signals; no internal pull-up/down; requires external bias if unused |
| 3 (GND) | Ground Reference | Primary return path for logic and output current; must be low-inductance connection to minimize ground bounce |
| 4 (Y) | 3-State Non-Inverting Output | Delivers A signal when OE = high; enters high-Z state when OE = low; rated for ±25 mA continuous sink/source |
| 5 (VCC) | Power Supply | Supplies core logic and output drivers; requires local 0.1 µF ceramic bypass capacitor placed within 2 mm |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range Operation | 2 V to 5.5 V enables single part to replace multiple voltage-specific buffers in multi-rail designs |
| 5.5-V-Tolerant Inputs | Allows direct connection to 5 V microcontrollers while powered from 3.3 V rails - eliminates discrete level translators |
| Low Dynamic Power Consumption | 14 pF typical power dissipation capacitance (Cpd) limits switching current and EMI in high-frequency clock distribution |
| Controlled Edge Rates | 20 ns/V input transition rate specification reduces overshoot/undershoot on unterminated PCB traces up to 10 cm |
| Industrial Temperature Rating | –40°C to +125°C operation supports deployment in enclosed medical enclosures and server chassis without derating |
Applications
| Projector Video Interface | Server Backplane Isolation |
|---|---|
Use Scenario: Routing HDMI auxiliary channel signals between FPGA-based scaler and DMD controller in compact portable projectors. IC Role / Device Role / Timing Role: Bidirectional bus buffer isolating I²C configuration lines and providing 3-state control during hot-plug detection. Use Value: 5.5-V-tolerant inputs accept 5 V DDC signals while operating from 3.3 V FPGA rail; 7 ns delay preserves setup/hold margins at 400 kHz I²C speeds. | Use Scenario: Enabling/disabling PCIe configuration space access between management controller and add-in cards in modular server blades. IC Role / Device Role / Timing Role: Single-channel 3-state buffer controlling address/data multiplexing on shared SMBus segments. Use Value: ±8 mA drive ensures reliable logic levels across 15 cm backplane traces; 10 µA ICC reduces idle power in always-on management subsystems. |
| Patient Monitoring I/O Expansion | TV Mainboard Signal Routing |
Use Scenario: Expanding GPIO count on ARM-based patient monitor mainboard to support additional sensor interrupt lines and LED status indicators. IC Role / Device Role / Timing Role: Low-power bus buffer isolating microcontroller GPIOs from external optocoupler and relay driver circuits. Use Value: –40°C to +125°C rating supports operation inside sealed medical enclosures; 5.5 V tolerance accommodates legacy 5 V sensor modules. | Use Scenario: Level-shifting and buffering IR remote receiver outputs and front-panel button scan lines in smart TV mainboards. IC Role / Device Role / Timing Role: True buffer translating 5 V remote signals to 3.3 V SoC inputs while preventing back-driving during sleep mode. Use Value: High-impedance disable state blocks leakage paths during deep-sleep; 2.9 mm × 2.1 mm SC-70 footprint saves space versus SOIC alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G126DCKR | Lower VCC min (1.65 V), higher ICC (max 10 µA same), identical pinout and function | Better suited for 1.8 V systems; not recommended for 2 V-only operation | Select when design uses 1.8 V logic rails and requires tighter VIH/VIL thresholds |
| 74AUP1G126GW,125 | Ultra-low power (ICC < 0.9 µA), slower tPD (10.3 ns @ 3.3 V), same 5-pin SC-70 package | Optimized for battery-powered remote controls and IoT sensors where nanowatt standby dominates timing | Choose when >50% reduction in quiescent current justifies 30% longer propagation delay |
Compared with SN74LVC1G126DCKR and 74AUP1G126GW,125, the 74AHC1G126DCKTE4 uniquely balances 2 V minimum supply, 7 ns speed at 5 V, and industrial temperature range - making it optimal for mixed-voltage embedded systems requiring robustness and timing headroom.
Availability
74AHC1G126DCKTE4 is available at Aetrix Electronics and suitable for server backplane isolation, medical patient monitoring I/O expansion, and smart TV mainboard signal routing requiring stable component supply across extended temperature and mixed-voltage environments.
Supply support for 74AHC1G126DCKTE4 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 and embedded processing technologies, with decades of expertise in logic IC design and high-reliability manufacturing.
The SN74AHC1G126 product line delivers single-gate 3-state buffers optimized for voltage translation, bus isolation, and low-power interface consolidation in industrial, medical, and consumer electronics.
FAQ
What is the maximum output current rating for the 74AHC1G126DCKTE4?
The 74AHC1G126DCKTE4 supports ±25 mA continuous output current per pin and ±50 mA total device current. At 5 V supply, it delivers ±8 mA output drive under standard switching conditions - sufficient for driving 50 Ω loads or up to 10 standard 74AHC inputs without exceeding thermal limits. Absolute maximum ratings must not be exceeded in any operational mode.
Does the 74AHC1G126DCKTE4 support 5 V tolerant inputs when powered from 3.3 V?
Yes, the 74AHC1G126DCKTE4 supports input voltages up to 5.5 V regardless of VCC level - including when powered from 3.3 V. This allows direct interfacing with 5 V microcontrollers or sensors without external level-shifting circuitry. The input structure is designed to clamp safely within absolute maximum ratings, and no additional protection components are required.
What is the recommended bypass capacitor for the 74AHC1G126DCKTE4 VCC pin?
A 0.1 µF ceramic capacitor is recommended for the 74AHC1G126DCKTE4 VCC pin, placed as close as possible (<2 mm) to the pin with minimal trace length. This value is specified in TI's layout guidelines to suppress high-frequency noise and maintain stable supply during output transitions. For systems with multiple logic devices sharing the same rail, parallel 0.1 µF and 1 µF capacitors are advised to cover broader frequency suppression.
How does the 74AHC1G126DCKTE4 behave during power-up and power-down sequences?
During power-up or power-down, the 74AHC1G126DCKTE4 output enters an undefined state unless OE is actively controlled. TI recommends tying OE to GND through a pulldown resistor (value determined by driver strength) to force Y into high-impedance before VCC stabilizes - preventing bus contention or unintended signal coupling. The device does not include internal power-on reset circuitry.
Is the 74AHC1G126DCKTE4 pin-compatible with other SC-70 5-pin logic buffers?
Yes, the 74AHC1G126DCKTE4 uses the standard SC-70 (DCK) 5-pin footprint defined in JEDEC MO-187, matching pin 1 location (Q3 quadrant), pad dimensions, and pitch. It is mechanically compatible with SN74LVC1G126DCKR and 74AUP1G126GW,125 - enabling drop-in replacement in existing layouts when electrical parameters align with system requirements.
74AHC1G126DCKTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- SC-70-5
74AHC1G126DCKTE4 FAQ
1.How can I place an order for 74AHC1G126DCKTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC1G126DCKTE4 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 74AHC1G126DCKTE4 reliable?
The price and inventory of 74AHC1G126DCKTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC1G126DCKTE4 is usually 5 days.
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74AHC1G126DCKTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC1G126DCKTE4 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 74AHC1G126DCKTE4?
For technical support, including 74AHC1G126DCKTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC1G126DCKTE4 requirements.
6.How does Aetrix verify that 74AHC1G126DCKTE4 is sourced from the original manufacturer or authorized distributors?
All 74AHC1G126DCKTE4 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 74AHC1G126DCKTE4 meets industry standards.
7.What is the process for return or replacement of 74AHC1G126DCKTE4?
All 74AHC1G126DCKTE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC1G126DCKTE4, 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 74AHC1G126DCKTE4 part is unused and in its original packaging.
Return procedure for 74AHC1G126DCKTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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