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Texas Instruments CAHCT1G126QDCKRG4Q
- Part No.:
- CAHCT1G126QDCKRG4Q
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
CAHCT1G126QDCKRG4Q.pdf
- Description:
- IC BUF NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:22,734
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Product details
Overview
CAHCT1G126QDCKRG4Q from Texas Instruments is an automotive-qualified single 3-state bus buffer gate with TTL-compatible inputs, operating from 3 V to 5.5 V, delivering ±8-mA output drive at 5 V and a maximum propagation delay of 6 ns. It enables/disables digital signals in vehicle control modules, sensor interfaces, and communication gateways.
For engineers reviewing the CAHCT1G126QDCKRG4Q datasheet, CAHCT1G126QDCKRG4Q pinout, CAHCT1G126QDCKRG4Q application, or CAHCT1G126QDCKRG4Q equivalent, key selection criteria include its AEC-Q100 qualification, SOT-SC70-5 package, 3-state output control via OE, and guaranteed operation across –40°C to +125°C ambient.
Technical Context
The CAHCT1G126QDCKRG4Q implements a positive-logic non-inverting buffer with active-high output enable (OE). When OE is high, input A passes directly to output Y; when OE is low, Y enters high-impedance state. Its CMOS output stage supports rail-to-rail switching and drives capacitive loads up to 50 pF while meeting timing specs.
It uses AHCT logic family architecture-TTL-input compatible with CMOS-output characteristics-ensuring interoperability with legacy 5-V TTL systems while maintaining low static current (≤10 µA) and robust ESD protection (±2000 V HBM). Thermal resistance is 293.4 °C/W (RθJA) in the DCK package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3 V to 5.5 V - supports direct interface with 3.3-V and 5-V microcontrollers and peripherals without level shifting |
| Max Propagation Delay | 6 ns at 5 V, CL = 15 pF - ensures sub-10-ns signal routing for real-time control loops |
| Output Drive | ±8 mA at 5 V - sufficient to drive multiple CMOS inputs or small LEDs without external buffers |
| ICC (Max) | 10 µA - enables ultra-low-power operation in always-on vehicle subsystems |
| Operating Temp | –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and body-control applications |
| ESD Rating | ±2000 V HBM - protects against handling and board-level electrostatic discharge in manufacturing and service environments |
| Input Compatibility | TTL-voltage - accepts standard 0.8 V/2.0 V logic thresholds, eliminating need for external biasing on legacy 5-V inputs |
Pinout & Package
CAHCT1G126QDCKRG4Q is housed in a 5-pin SOT-SC70 (DCK) package measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), optimized for space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-high output enable | Drives Y into high-Z when low; must be pulled low during power-up to prevent bus contention |
| 2 - A | Buffer input | Accepts TTL-compatible logic levels; internally terminated to avoid floating states |
| 3 - GND | Ground reference | Provides return path for all internal logic and output currents; requires low-inductance connection to system ground plane |
| 4 - Y | 3-state buffered output | Delivers true A signal when OE = high; presents >10⁹ Ω impedance when OE = low |
| 5 - VCC | Power supply | Supplies core logic and output drivers; requires local 0.1-µF ceramic bypass capacitor placed ≤2 mm from pin |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (–40°C to +125°C) - certified for automotive powertrain, chassis, and body electronics |
| 3-state output control | OE pin enables deterministic bus isolation - prevents signal collisions in shared data lines |
| TTL-input compatibility | VIH = 2.0 V (at VCC = 4.5–5.5 V) - interoperates with legacy 5-V controllers without pull-up resistors or translators |
| Low dynamic power | Cpd = 14 pF - minimizes switching current in high-frequency enable/disable cycling (e.g., LED blink control) |
| Robust thermal performance | RθJA = 293.4 °C/W - allows sustained operation at full load in sealed enclosures without forced airflow |
Applications
| Engine Control Unit (ECU) Signal Isolation | Automotive Infotainment Interface |
|---|---|
Use Scenario: Isolating diagnostic CAN transceiver enable lines from MCU GPIOs during firmware updates. IC Role / Device Role / Timing Role: 3-state buffer isolates MCU pins from transceiver side during reset sequences, preventing spurious bus traffic. Use Value: Eliminates need for discrete MOSFET switches; OE-controlled high-Z state guarantees no current leakage or voltage backfeed during safe boot. | Use Scenario: Enabling/disabling audio codec clock signals based on playback state in head unit designs. IC Role / Device Role / Timing Role: Buffers and gates I²S master clock (MCLK) to downstream DACs only when active. Use Value: Reduces system standby power by 12 µA per channel versus always-on clock distribution; meets OEM audio subsystem sleep-current budgets. |
| Body Control Module (BCM) LED Driver | ADAS Camera Power Sequencing |
Use Scenario: Driving status indicator LEDs (e.g., door-open, seatbelt) from low-drive-capability microcontroller outputs. IC Role / Device Role / Timing Role: Provides ±8-mA sink/source capability to illuminate 20-mA LEDs directly without external transistor stages. Use Value: Saves BOM cost and PCB area vs. discrete driver solutions; TTL-compatible input simplifies firmware GPIO mapping. | Use Scenario: Controlling power-enable signals to image sensor modules during camera wake/sleep transitions. IC Role / Device Role / Timing Role: Gates 1.8-V or 3.3-V enable lines to sensor PMICs using MCU-controlled OE, ensuring precise sequencing. Use Value: Prevents sensor latch-up during partial power-up; 6-ns max tpd ensures sub-10-ns enable edge alignment with SoC power management timers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G126QDCKRQ1 | Lower VCC range (1.65–5.5 V); higher speed (tPD = 3.5 ns @ 3.3 V); lower drive (±24 mA @ 3.3 V) | Better suited for mixed-voltage 1.8-V/3.3-V domains; not TTL-input compatible | Select when interfacing with modern low-voltage MCUs and requiring faster enable response |
| SN74AHCT1G125QDCKRG4Q | Inverting logic (A → Y̅); identical voltage, timing, and drive specs | Required where signal polarity inversion is needed in bus arbitration or feedback paths | Choose only when functional inversion is explicitly required - otherwise CAHCT1G126QDCKRG4Q provides direct signal pass-through |
Compared with SN74LVC1G126QDCKRQ1, CAHCT1G126QDCKRG4Q ensures backward compatibility with 5-V TTL systems but trades off some speed; compared with SN74AHCT1G125QDCKRG4Q, it preserves signal polarity critical for transparent data gating in control loops.
Availability
CAHCT1G126QDCKRG4Q is available at Aetrix Electronics and suitable for automotive ECU signal isolation, infotainment interface control, BCM LED driving, and ADAS camera power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CAHCT1G126QDCKRG4Q 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 company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and communications markets.
The SN74AHCT1G126-Q1 product line delivers AEC-Q100-qualified logic devices designed specifically for automotive signal conditioning, bus buffering, and interface isolation in harsh-temperature environments.
FAQ
What is the recommended power supply decoupling for CAHCT1G126QDCKRG4Q?
A 0.1-µF ceramic capacitor must be placed between VCC and GND, located physically within 2 mm of the CAHCT1G126QDCKRG4Q pins. This minimizes high-frequency noise coupling and ensures stable switching performance. For systems with broadband noise, paralleling a 1-µF capacitor is acceptable - both must use X7R dielectric and low-ESR construction.
Does CAHCT1G126QDCKRG4Q support hot insertion or live bus connection?
No. CAHCT1G126QDCKRG4Q does not feature hot-swap or bus-fault protection circuitry. Connecting or disconnecting while powered risks violating absolute maximum ratings on IOK (±20 mA clamp current) and may cause latch-up. System-level hot-plug capability requires external series resistors and TVS diodes, as specified in TI application report SLLA309.
Can unused inputs on CAHCT1G126QDCKRG4Q be left floating?
No. The A input must be tied to VCC or GND via a pull-up or pull-down resistor (10 kΩ typical) to prevent undefined logic states and excessive ICC. Floating inputs increase susceptibility to noise, cause oscillation, and raise static current - violating the "all unused inputs must be held at VCC or GND" requirement in section 6.3 of the CAHCT1G126QDCKRG4Q datasheet.
What is the maximum capacitive load CAHCT1G126QDCKRG4Q can drive while maintaining timing specs?
CAHCT1G126QDCKRG4Q guarantees switching characteristics (tPLH, tPHL, etc.) up to 50 pF load capacitance at both 3 V and 5 V supply. Driving >50 pF increases propagation delay nonlinearly and may violate setup/hold margins in synchronous systems. For loads exceeding 50 pF, TI recommends adding a series resistor or selecting a higher-drive buffer such as SN74AHCT244-Q1.
Is CAHCT1G126QDCKRG4Q pin-compatible with non-automotive versions like SN74AHCT1G126DRYR?
Yes - CAHCT1G126QDCKRG4Q shares identical pinout, package (DCK), and electrical behavior with SN74AHCT1G126DRYR. However, CAHCT1G126QDCKRG4Q is AEC-Q100 qualified, undergoes additional automotive-grade screening (including extended temperature burn-in and failure analysis), and carries different part marking (BNS) and MSL rating documentation. Functional substitution is possible, but automotive compliance requires the Q1 suffix.
CAHCT1G126QDCKRG4Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
CAHCT1G126QDCKRG4Q FAQ
1.How can I place an order for CAHCT1G126QDCKRG4Q through Aetrix?
Please submit a Request for Quotation (RFQ) for CAHCT1G126QDCKRG4Q 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 CAHCT1G126QDCKRG4Q reliable?
The price and inventory of CAHCT1G126QDCKRG4Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAHCT1G126QDCKRG4Q is usually 5 days.
3.What payment methods are accepted for CAHCT1G126QDCKRG4Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAHCT1G126QDCKRG4Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAHCT1G126QDCKRG4Q?
CAHCT1G126QDCKRG4Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAHCT1G126QDCKRG4Q 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 CAHCT1G126QDCKRG4Q?
For technical support, including CAHCT1G126QDCKRG4Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAHCT1G126QDCKRG4Q requirements.
6.How does Aetrix verify that CAHCT1G126QDCKRG4Q is sourced from the original manufacturer or authorized distributors?
All CAHCT1G126QDCKRG4Q 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 CAHCT1G126QDCKRG4Q meets industry standards.
7.What is the process for return or replacement of CAHCT1G126QDCKRG4Q?
All CAHCT1G126QDCKRG4Q units undergo pre-shipment inspection (PSI). If there is an issue with CAHCT1G126QDCKRG4Q, 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 CAHCT1G126QDCKRG4Q part is unused and in its original packaging.
Return procedure for CAHCT1G126QDCKRG4Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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