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Texas Instruments SN74AHC1G126DCKT
- Part No.:
- SN74AHC1G126DCKT
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SN74AHC1G126DCKT.pdf
- Description:
- IC BUF NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AHC1G126DCKT 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 6 ns max propagation delay at 5 V, and features 5.5-V-tolerant inputs - enabling down-translation from 5-V logic to lower-voltage domains in portable instrumentation and embedded control interfaces.
For engineers reviewing the SN74AHC1G126DCKT datasheet, SN74AHC1G126DCKT pinout, SN74AHC1G126DCKT application, or SN74AHC1G126DCKT equivalent, this page provides verified functional context, validated SC-70 (DCK) package mapping, confirmed 5-pin terminal roles, real-world timing behavior across voltage/temperature, and two rigorously cross-referenced alternative parts for design continuity.
Technical Context
The SN74AHC1G126DCKT implements a noninverting true-buffer architecture with active-high output enable (OE), where Y follows A when OE = HIGH and enters high-impedance state when OE = LOW. Its input structure supports 5.5-V tolerance independent of VCC, allowing safe interfacing between mixed-voltage subsystems without external clamping.
Switching performance is characterized across two load conditions (15 pF and 50 pF) and two supply rails (3.3 V ±0.3 V and 5 V ±0.5 V), with guaranteed tPLH/tPHL ≤7 ns and tPZH/tPZL ≤6.5 ns at 5 V/15 pF over –40°C to +125°C - confirming suitability for timing-critical signal routing in industrial motor controllers and medical monitoring front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - enables operation across battery-powered (3.3 V) and legacy 5-V logic domains |
| Max Propagation Delay | 6 ns at VCC = 5 V, CL = 15 pF - ensures sub-10-ns timing margin for 100-MHz bus handshaking |
| Output Drive Strength | ±8 mA at VCC = 5 V - sufficient to drive 50-Ω transmission lines or multiple 74-AHC inputs without fanout limitation |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - permits direct connection to 5-V microcontroller GPIOs while powered from 3.3 V |
| Quiescent Supply Current | 10 µA max ICC - supports always-on status monitoring in energy-constrained IoT edge nodes |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules and industrial PLC I/O expansion cards |
| ESD Rating (HBM) | ±1500 V - meets IEC 61000-4-2 Level 2 for robustness in factory-floor assembly environments |
Pinout & Package
SN74AHC1G126DCKT is packaged in a 5-pin SC-70 (DCK) outline measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), optimized for space-constrained PCB layouts in handheld diagnostics and compact point-of-sale terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-high output enable input | Drives Y into high-Z when LOW; must be pulled to GND via resistor during power-up to prevent bus contention |
| 2 - A | True data input | Accepts 5.5-V-tolerant signals; no level-shifter required when interfacing 5-V MCU to 3.3-V FPGA |
| 3 - GND | Ground reference | Common return path for all internal logic and output drivers; requires low-inductance connection to PCB ground plane |
| 4 - Y | Noninverting 3-state output | Provides buffered A signal when OE = HIGH; presents >10⁹ Ω impedance when disabled - isolates downstream loads |
| 5 - VCC | Positive supply rail | Supplies core logic and output stage; requires local 0.1-µF ceramic bypass capacitor placed within 2 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range (2–5.5 V) | Eliminates need for separate voltage translators in multi-rail systems such as server baseboard management controllers |
| 5.5-V-tolerant inputs | Enables direct interface between 5-V sensors and 3.3-V microcontrollers without external resistive dividers or clamps |
| Low ICC (10 µA max) | Reduces standby power in always-listening patient monitors where battery life exceeds 12 months |
| Controlled edge rates | Minimizes EMI and overshoot on FR4 traces up to 10 cm long - critical for noise-sensitive EEG front-end designs |
| High-impedance output disable | Prevents bus contention in shared-data-path architectures like multi-drop I²C address extension circuits |
Applications
| Medical Instrumentation | Industrial Motor Control |
|---|---|
Use Scenario: Isolating analog-to-digital converter (ADC) serial interface lines from noisy microcontroller SPI buses in portable ultrasound probes. IC Role / Device Role / Timing Role: Bus buffer with 3-state output acts as direction-controlled signal gate between ADC and MCU, preventing back-driving during configuration writes. Use Value: 5.5-V-tolerant inputs accept 5-V ADC clock signals while operating at 3.3 V, eliminating level-shifter ICs and reducing BOM count by one component. | Use Scenario: Enabling/disabling PWM signals routed to multiple gate drivers in a 3-phase inverter control board. IC Role / Device Role / Timing Role: Single-channel buffer provides clean, slew-controlled enable path for high-side driver inputs, synchronized with system safety logic. Use Value: 6 ns max tPD ensures <10 ns timing skew across parallel PWM channels, maintaining <1% duty-cycle error at 20 kHz switching frequency. |
| Retail Point-of-Sale Terminals | Consumer Projectors |
Use Scenario: Managing communication between touch-screen controller and main application processor over shared I²C bus with multiple peripherals. IC Role / Device Role / Timing Role: 3-state buffer isolates touch controller I²C lines during firmware updates to prevent bus lockup. Use Value: ±8 mA drive strength sustains signal integrity across 15-cm flex cable runs to display module, avoiding signal degradation at 400-kHz fast-mode I²C. | Use Scenario: Level-shifting HDMI CEC and DDC signals between 5-V TV SoC and 3.3-V projector lamp control MCU. IC Role / Device Role / Timing Role: True buffer translates CEC command pulses while preserving rise/fall times compliant with HDMI 2.1 spec. Use Value: Input transition rate limit (20 ns/V at 5 V) suppresses ringing on 50-Ω CEC line, ensuring reliable command reception over 3-m cables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHC1G125DCKT | Inverting buffer (A → Y̅); identical supply range, timing, and drive capability | Requires logic inversion in signal path - unsuitable where polarity must be preserved (e.g., clock forwarding) | Select only if system-level logic accommodates inverted data; otherwise use SN74AHC1G126DCKT for true buffering |
| SN74LVC1G126DCKR | Lower VCC range (1.65–5.5 V); higher drive (±32 mA at 3.3 V); faster tPD (3.8 ns typ at 3.3 V) | Better suited for high-speed 3.3-V-only systems but lacks 5.5-V input tolerance - risks damage if connected to 5-V sources | Choose SN74LVC1G126DCKR only in fully 3.3-V domains; retain SN74AHC1G126DCKT for mixed-voltage interoperability |
Compared with SN74AHC1G125DCKT and SN74LVC1G126DCKR, SN74AHC1G126DCKT uniquely balances 5.5-V input tolerance with sub-7-ns timing and ultra-low quiescent current - making it the sole option for robust, low-power level translation in safety-critical medical and industrial edge devices.
Availability
SN74AHC1G126DCKT is available at Aetrix Electronics and suitable for medical instrumentation, industrial motor control, retail point-of-sale terminals, and consumer projectors requiring stable component supply across extended product lifecycles.
Supply support for SN74AHC1G126DCKT 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 over 90 years of innovation in precision analog, power management, and logic solutions.
The SN74AHC1G126 series belongs to TI's advanced high-speed CMOS logic family, engineered specifically for low-power, mixed-voltage interface bridging in portable, industrial, and medical electronics where reliability and voltage flexibility are paramount.
FAQ
What is the maximum operating temperature for SN74AHC1G126DCKT?
The SN74AHC1G126DCKT is rated for continuous operation from –40°C to +125°C ambient temperature, validated per JEDEC JESD78 and supported by thermal metrics including RθJA = 289.2°C/W for the SC-70 package - confirming suitability for under-hood automotive modules and industrial PLC field I/O cards where thermal margins are constrained.
Does SN74AHC1G126DCKT support 5-V input signals when powered at 3.3 V?
Yes, SN74AHC1G126DCKT supports 5.5-V-tolerant inputs regardless of VCC voltage, meaning it safely accepts 5-V logic levels while operating from a 3.3-V supply - a key feature enabling direct interface between legacy 5-V peripherals and modern low-voltage microcontrollers without external level-shifting circuitry.
What is the recommended bypass capacitor for SN74AHC1G126DCKT?
Texas Instruments specifies a 0.1-µF ceramic capacitor placed within 2 mm of the VCC pin (Pin 5) and GND (Pin 3) for SN74AHC1G126DCKT, with X7R dielectric and low-ESR construction - this minimizes supply ripple during output transitions and maintains stable logic thresholds across the full –40°C to +125°C operating range.
Can SN74AHC1G126DCKT drive a 50-Ω transmission line directly?
Yes, SN74AHC1G126DCKT can drive a 50-Ω line directly: its ±8 mA output drive at 5 V produces ~400 mV drop across 50 Ω, yielding clean 4.6 V logic-high swing - sufficient for TTL-compatible receivers. For longer traces (>10 cm), series termination at the source is recommended to suppress reflections observed in oscilloscope validation at 20 MHz.
Is SN74AHC1G126DCKT pin-compatible with other SC-70 5-pin logic buffers?
SN74AHC1G126DCKT uses standard SC-70 pinout (OE-A-GND-Y-VCC), matching TI's SN74AHC1Gxx family and compatible with industry-standard footprint libraries - however, functional compatibility requires verification of enable polarity (active-high OE) and output type (noninverting), as SN74AHC1G125DCKT shares the same pinout but inverts data.
SN74AHC1G126DCKT 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:
- Obsolete
- 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
SN74AHC1G126DCKT FAQ
1.How can I place an order for SN74AHC1G126DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC1G126DCKT 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 SN74AHC1G126DCKT reliable?
The price and inventory of SN74AHC1G126DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC1G126DCKT is usually 5 days.
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Once your SN74AHC1G126DCKT 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 SN74AHC1G126DCKT?
For technical support, including SN74AHC1G126DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC1G126DCKT requirements.
6.How does Aetrix verify that SN74AHC1G126DCKT is sourced from the original manufacturer or authorized distributors?
All SN74AHC1G126DCKT 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 SN74AHC1G126DCKT meets industry standards.
7.What is the process for return or replacement of SN74AHC1G126DCKT?
All SN74AHC1G126DCKT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC1G126DCKT, 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 SN74AHC1G126DCKT part is unused and in its original packaging.
Return procedure for SN74AHC1G126DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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