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Texas Instruments CAHCT1G126QDCKRG4
- Part No.:
- CAHCT1G126QDCKRG4
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
CAHCT1G126QDCKRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,448
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Product details
Overview
CAHCT1G126QDCKRG4 from Texas Instruments is an automotive-qualified single 3-state bus buffer gate in SC-70 (DCK) 5-pin package, operating from 3 V to 5.5 V, with 6 ns max propagation delay at 5 V, ±8-mA output drive, and TTL-compatible inputs. It enables/disables digital signals in vehicle control modules, sensor interfaces, and communication gateways.
For engineers reviewing the CAHCT1G126QDCKRG4 datasheet, CAHCT1G126QDCKRG4 pinout, CAHCT1G126QDCKRG4 application, or CAHCT1G126QDCKRG4 equivalent, this page delivers verified functional identity, automotive-grade thermal and ESD specs, true 3-state timing behavior, and validated alternative options for signal routing and enable control in safety-critical embedded systems.
Technical Context
The CAHCT1G126QDCKRG4 implements a positive-logic non-inverting buffer with active-high 3-state output control: when OE is high, A passes to Y; when OE is low, Y enters high-impedance state. Its CMOS input stage accepts TTL-level voltages (VIH = 2 V min at 4.5–5.5 V), ensuring compatibility with legacy microcontrollers and logic families.
Designed for automotive environments, it supports –40°C to +125°C operation, features ±2000-V HBM ESD rating, and maintains stable ICC ≤ 10 µA across voltage and temperature. The SC-70 package delivers RθJA = 293.4 °C/W, enabling reliable performance in space-constrained engine control units and ADAS sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 5.5 V - supports direct interface with 3.3 V and 5 V MCU I/O rails without level shifters |
| Max Propagation Delay | 6 ns at 5 V, CL = 15 pF - ensures sub-10 ns signal routing for real-time CAN/LIN peripheral enable paths |
| Output Drive Strength | ±8 mA at 5 V - sufficient to drive multiple CMOS inputs or indicator LEDs without external buffers |
| Input Voltage Compatibility | TTL-compatible (VIH = 2 V min at 5 V) - interoperable with legacy 5 V microcontrollers and discrete logic |
| Quiescent Current | ≤ 10 µA - enables always-on monitoring circuits with negligible battery drain in sleep modes |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and powertrain applications |
| ESD Rating (HBM) | ±2000 V - meets automotive system-level ESD immunity requirements for exposed signal lines |
Pinout & Package
SC-70 (DCK) 5-pin surface-mount package: 2.0 mm × 2.1 mm body size, 1.25 mm width, 0.65 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-high output enable input | Drives Y into high-Z when low; ties to GND via pulldown resistor for power-up safety |
| 2 - A | Buffer input | Accepts TTL-level signals; must be terminated to VCC or GND if unused |
| 3 - GND | Ground reference | Return path for all internal logic and output current; requires low-inductance PCB connection |
| 4 - Y | 3-state non-inverting output | Drives downstream loads only when OE = high; floats to high-Z otherwise |
| 5 - VCC | Positive supply | Must be bypassed with 0.1-µF capacitor placed adjacent to pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 certified - validated for use in engine control, braking, and body electronics |
| True 3-state output control | OE-driven high-impedance state prevents bus contention in shared data lines and multiplexed sensor networks |
| TTL-compatible inputs | Accepts 0.8 V/2.0 V thresholds at 5 V - eliminates need for external level translators with legacy MCUs |
| Low static power | ICC ≤ 10 µA - supports always-on diagnostic monitoring without compromising battery longevity |
| Robust ESD protection | ±2000 V HBM - sustains repeated handling and board-level transients in manufacturing and field service |
Applications
| Engine Control Unit (ECU) Signal Routing | ADAS Camera Interface Enable |
|---|---|
Use Scenario: Isolating diagnostic test signals from main CAN bus during firmware updates. IC Role / Device Role / Timing Role: 3-state buffer controlled by microcontroller GPIO to gate bidirectional communication lines. Use Value: Prevents bus contention during reprogramming; 6 ns delay ensures timing-critical diagnostics remain synchronized. |
Use Scenario: Enabling high-speed LVDS or MIPI clock/data lanes only when camera module is active. IC Role / Device Role / Timing Role: Output-enable gate synchronizing power domain activation with image capture sequence. Use Value: Reduces standby current by disabling unused signal paths; ±8-mA drive supports short trace fanout to serializer ICs. |
| Body Control Module (BCM) LED Driver | Infotainment System Bus Isolation |
Use Scenario: Driving status LEDs on dashboard panels with precise on/off timing. IC Role / Device Role / Timing Role: Non-inverting buffer with OE-controlled output enabling PWM dimming via MCU. Use Value: TTL-compatible input accepts direct GPIO drive; 8-mA sink/source capability drives LEDs without external transistors. |
Use Scenario: Isolating infotainment processor I²C or SPI peripherals during sleep mode. IC Role / Device Role / Timing Role: Bidirectional bus buffer with 3-state output preventing backfeed into powered-down subsystems. Use Value: High-Z state eliminates leakage paths; 3–5.5 V range matches both 3.3 V SoC and 5 V peripheral rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G126DBVR | Wider supply range (1.65–5.5 V), lower drive (±24 mA), non-automotive grade | Lacks AEC-Q100 qualification; unsuitable for powertrain or safety-critical modules | Select when cost-sensitive consumer or industrial designs require broader voltage flexibility |
| SN74AHCT1G126DBVRQ1 | Identical electrical specs, SOT-23 (DBV) package (2.9 × 2.8 mm vs. DCK's 2.0 × 2.1 mm) | Same automotive qualification but larger footprint; higher RθJA (278 °C/W) than DCK variant | Choose when PCB layout allows larger package and thermal margin is less constrained |
Compared with SN74LVC1G126DBVR, CAHCT1G126QDCKRG4 provides guaranteed automotive reliability and tighter timing control; compared with SN74AHCT1G126DBVRQ1, it offers 15% smaller footprint and superior thermal resistance for dense ECU layouts.
Availability
CAHCT1G126QDCKRG4 is available at Aetrix Electronics and suitable for engine control units, ADAS camera interfaces, body control modules, and infotainment bus isolation requiring stable component supply across automotive production lifecycles.
Supply support for CAHCT1G126QDCKRG4 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, embedded processing, and connectivity solutions with deep automotive design expertise and AEC-Q100 validation infrastructure.
The SN74AHCT1G126-Q1 product line targets automotive signal integrity and bus management, delivering robust 3-state buffering for ECU, ADAS, and body electronics where reliability, timing precision, and environmental resilience are mandatory.
FAQ
What is the function of the OE pin on the CAHCT1G126QDCKRG4?
The OE (Output Enable) pin on the CAHCT1G126QDCKRG4 is an active-high control input that determines whether the Y output reflects the A input (OE = high) or enters a high-impedance state (OE = low). This enables bus sharing and signal gating in automotive networks. For safe power-up, TI recommends tying OE to GND via a pulldown resistor to prevent unintended output assertion before MCU initialization.
Does the CAHCT1G126QDCKRG4 support 3.3 V logic levels?
Yes, the CAHCT1G126QDCKRG4 operates down to 3 V and accepts TTL-compatible inputs - at 3 V supply, VIH is 1.4 V min and VIL is 0.53 V max, making it compatible with standard 3.3 V CMOS outputs. Its output VOH/VOL specs guarantee clean logic transitions into 3.3 V loads, eliminating need for external level-shifting circuitry in mixed-voltage automotive subsystems.
Is the CAHCT1G126QDCKRG4 pin-compatible with other SC-70 5-pin buffers?
No - while the CAHCT1G126QDCKRG4 uses the standard SC-70 (DCK) 5-pin footprint, its pinout (OE-A-GND-Y-VCC) is specific to the AHCT1G126 function. Other SC-70 buffers like SN74LVC1G125 (inverting) or SN74LVC1G08 (AND gate) have different pin assignments. Always verify pin mapping against the official TI datasheet before PCB layout reuse.
What is the maximum capacitive load the CAHCT1G126QDCKRG4 can drive while maintaining timing specs?
The CAHCT1G126QDCKRG4 is characterized for CL = 15 pF and 50 pF loads. At 5 V, tPLH/tPHL remains ≤ 8.5 ns (max) for 15-pF loads and ≤ 10.5 ns (max) for 50-pF loads. TI specifies 50 pF as the recommended maximum for guaranteed data sheet performance; exceeding this increases propagation delay and may degrade signal integrity in high-speed automotive buses.
How does the CAHCT1G126QDCKRG4 handle unused inputs?
The CAHCT1G126QDCKRG4 has only one input (A) and one control pin (OE); both must be actively driven. If OE is not controlled by a microcontroller, TI mandates termination to GND via a pulldown resistor to ensure Y remains in high-Z during power-up. The A input must also be tied to VCC or GND if unused - floating inputs cause increased ICC, noise susceptibility, and potential latch-up in automotive temperature ranges.
CAHCT1G126QDCKRG4 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:
- 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:
- 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
CAHCT1G126QDCKRG4 FAQ
1.How can I place an order for CAHCT1G126QDCKRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAHCT1G126QDCKRG4 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 CAHCT1G126QDCKRG4 reliable?
The price and inventory of CAHCT1G126QDCKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAHCT1G126QDCKRG4 is usually 5 days.
3.What payment methods are accepted for CAHCT1G126QDCKRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAHCT1G126QDCKRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAHCT1G126QDCKRG4?
CAHCT1G126QDCKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAHCT1G126QDCKRG4 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 CAHCT1G126QDCKRG4?
For technical support, including CAHCT1G126QDCKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAHCT1G126QDCKRG4 requirements.
6.How does Aetrix verify that CAHCT1G126QDCKRG4 is sourced from the original manufacturer or authorized distributors?
All CAHCT1G126QDCKRG4 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 CAHCT1G126QDCKRG4 meets industry standards.
7.What is the process for return or replacement of CAHCT1G126QDCKRG4?
All CAHCT1G126QDCKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with CAHCT1G126QDCKRG4, 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 CAHCT1G126QDCKRG4 part is unused and in its original packaging.
Return procedure for CAHCT1G126QDCKRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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