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Texas Instruments CAHCT1G125QDCKRG4Q
- Part No.:
- CAHCT1G125QDCKRG4Q
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
CAHCT1G125QDCKRG4Q.pdf
- Description:
- IC BUF NON-INVERT 5.5V SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:16,331
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Product details
Overview
CAHCT1G125QDCKRG4Q from Texas Instruments is an automotive-qualified single 3-state bus buffer gate used for digital signal enable/disable in power-sensitive, high-reliability systems. It operates from 3V to 5.5V, delivers ±8-mA output drive at 5V, achieves 5.5ns typical propagation delay (tPLH/tPHL) at 5V/15pF, and consumes ≤10µA ICC in quiescent state - enabling robust signal isolation in motor control reset paths and communication interface translation.
For engineers reviewing the CAHCT1G125QDCKRG4Q datasheet, CAHCT1G125QDCKRG4Q pinout, CAHCT1G125QDCKRG4Q application, or CAHCT1G125QDCKRG4Q equivalent, this page provides verified functional mode behavior, SC70-5 package mechanical data, automotive-grade thermal and ESD specs (±2000V HBM), and real-world use cases including active-low reset consolidation and LED driver control.
Technical Context
The CAHCT1G125QDCKRG4Q implements a single non-inverting buffer with tri-state output controlled by an active-low OE input. When OE is low, A propagates to Y; when OE is high, Y enters high-impedance state - enabling bidirectional bus sharing and signal gating without loading downstream nodes.
It uses AHCT logic family architecture with TTL-compatible inputs (VIH = 2V min at VCC = 4.5–5.5V), rail-to-rail CMOS outputs, and guaranteed operation across –40°C to +125°C ambient. Its 5-pin SC70 package supports high-density routing while maintaining 293.4°C/W junction-to-ambient thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3V to 5.5V - supports direct interface with 3.3V and 5V logic domains without level shifters. |
| Max Propagation Delay | 8.5ns at 5V/15pF - ensures timing-critical signal routing in automotive microcontroller peripheral interfaces. |
| Output Drive | ±8mA at 5V - sufficient to directly drive LEDs, small logic loads, or multiple 74AHCT inputs (fan-out ≥10). |
| ICC (Quiescent) | ≤10µA - enables always-on monitoring circuits without compromising system standby power budget. |
| ESD Rating | ±2000V HBM per AEC-Q100-002 - meets automotive board-level ESD immunity requirements. |
| Operating Temp | –40°C to +125°C - qualified for under-hood and powertrain control module environments. |
| Input Compatibility | TTL-voltage compatible (VIH = 2V min at 5V) - interoperable with legacy 5V microcontrollers and sensors. |
Pinout & Package
CAHCT1G125QDCKRG4Q is housed in a 5-pin SC70 (DCK) package measuring 2.0mm × 2.1mm body size (1.25mm width), with 0.65mm pitch and wettable flank side walls for automated optical inspection. The package is RoHS-compliant, MSL Level-1, and optimized for reflow soldering on space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-low output enable input | Drives Y into high-Z when high; must be pulled up via resistor during power-up to prevent undefined output state. |
| 2 - A | Buffer input | Accepts TTL-compatible signals; no internal pull-up/down - external bias required if unused. |
| 3 - GND | Ground reference | Primary return path for logic and output current; requires low-inductance connection to PCB ground plane. |
| 4 - Y | 3-state buffered output | True replica of A when OE is low; presents >10⁹Ω impedance when OE is high - isolates downstream circuitry. |
| 5 - VCC | Power supply | Must be decoupled with 0.1µF ceramic capacitor placed within 2mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 certified - validated for continuous operation in automotive powertrain and chassis modules. |
| 3-state output control | OE-driven high-impedance mode eliminates bus contention in shared signal lines and reduces dynamic power dissipation. |
| Low ICC leakage | ≤10µA max supply current - enables integration into always-on diagnostic circuits without battery drain concerns. |
| TTL-compatible inputs | VIH = 2V min at 5V allows direct connection to legacy 5V MCUs and sensors without external level translation. |
| Robust ESD protection | ±2000V HBM rating - exceeds ISO 10605 requirements for in-vehicle electronics handling and assembly. |
Applications
| Motor Controller Reset Management | LED Indicator Control |
|---|---|
Use Scenario: Consolidating four independent system reset signals into a single active-low reset line for an automotive motor controller IC. IC Role / Device Role / Timing Role: Acts as a gated OR function (via inverted logic) to assert RESET only when all upstream conditions are met - leveraging its true-buffer + 3-state capability. Use Value: Eliminates need for discrete logic gates or MCU firmware intervention, reducing BOM count and improving fault response time. |
Use Scenario: Driving a status LED from a microcontroller GPIO pin that also serves other functions. IC Role / Device Role / Timing Role: Provides current gain and signal isolation - enabling LED activation without loading the MCU pin during sleep modes. Use Value: Enables reliable visual indication while preserving GPIO flexibility and minimizing I/O resource contention. |
| Communication Module Translation | Signal Isolation in Safety-Critical Paths |
Use Scenario: Interfacing a CAN transceiver's TXD line with a microcontroller operating at different voltage levels or timing margins. IC Role / Device Role / Timing Role: Buffers and isolates the signal path, preventing back-drive and ensuring clean edge transitions into the transceiver input. Use Value: Improves signal integrity and noise immunity in noisy vehicle networks without adding propagation delay beyond 8.5ns. |
Use Scenario: Enabling/disabling a watchdog timer input based on system health monitoring logic. IC Role / Device Role / Timing Role: Functions as a fail-safe gate - holding watchdog input high-Z during fault conditions to trigger safe shutdown. Use Value: Supports ASIL-B functional safety decomposition by providing hardware-enforced signal blocking independent of software state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125QDRYRQ1 | Lower VCC range (1.65–5.5V); higher speed (tPD = 3.7ns typ at 3.3V); 3.3V-optimized I/O thresholds. | Better suited for mixed-voltage 1.8V/3.3V systems; not recommended for pure 5V legacy designs due to VIH/VIL mismatch. | Select when migrating to lower-voltage domains or requiring faster switching in 3.3V applications. |
| SN74AHC1G125QDBVRQ1 | Same pinout/package (SOT-23-5); identical logic function; wider VCC range (2–5.5V); slightly higher ICC (20µA max). | Compatible drop-in replacement in space-constrained layouts where SC70 footprint is unavailable; higher thermal resistance (278°C/W vs. 293.4°C/W). | Choose when SOT-23 mounting is preferred or when marginally higher supply current is acceptable for improved noise immunity. |
Compared with SN74LVC1G125QDRYRQ1 and SN74AHC1G125QDBVRQ1, CAHCT1G125QDCKRG4Q uniquely balances 5V TTL compatibility, automotive qualification, and SC70 footprint - making it optimal for retrofitting legacy 5V automotive subsystems where board area and voltage interoperability are critical constraints.
Availability
CAHCT1G125QDCKRG4Q is available at Aetrix Electronics and suitable for automotive motor control, LED driver circuits, communication interface translation, and safety-critical signal gating requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CAHCT1G125QDCKRG4Q 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, embedded processing, and automotive-grade silicon solutions with over 50 years of automotive qualification experience.
The SN74AHCT1G125-Q1 product line delivers single-channel 3-state buffers optimized for automotive signal integrity, low-power operation, and robustness in harsh electrical environments - targeting powertrain, body electronics, and ADAS subsystems.
FAQ
What is the maximum operating voltage for CAHCT1G125QDCKRG4Q?
The CAHCT1G125QDCKRG4Q supports a supply voltage range of 3V to 5.5V. Operation above 5.5V violates absolute maximum ratings and risks permanent damage. At 5.5V, output drive remains ±8mA, and propagation delay increases only marginally - making it ideal for 5V automotive systems with supply tolerance.
How does CAHCT1G125QDCKRG4Q handle unused input pins?
CAHCT1G125QDCKRG4Q has one input (A) and one control pin (OE). If A is unused, it must be tied to VCC or GND to prevent floating - TI recommends connecting it to GND to ensure predictable Y output state when OE is low. OE must never float; tie to VCC via pull-up resistor for defined high-Z default at power-up.
Is CAHCT1G125QDCKRG4Q pin-compatible with standard SC70-5 logic devices?
Yes - CAHCT1G125QDCKRG4Q uses the industry-standard SC70-5 (DCK) footprint with 0.65mm pitch and identical pin 1 location (top-left quadrant). Its pinout (OE-A-GND-Y-VCC) matches JEDEC MO-203 and TI's DCK0005A outline, enabling direct placement in existing SC70-5 land patterns without layout changes.
What thermal performance can be expected from CAHCT1G125QDCKRG4Q in a typical automotive PCB layout?
In a standard 2-layer PCB with 1oz copper and minimal thermal relief, CAHCT1G125QDCKRG4Q exhibits a junction-to-ambient thermal resistance of 293.4°C/W. With a 0.1µF bypass capacitor and GND flood fill beneath the package, temperature rise stays below 15°C at full 8mA load - well within its –40°C to +125°C operating range.
Does CAHCT1G125QDCKRG4Q support hot-swap or live-insertion scenarios?
No - CAHCT1G125QDCKRG4Q lacks powered-off protection or Ioff functionality. Applying voltage to A or Y while VCC is absent may cause unintended current flow through internal clamps. For hot-swap applications, TI recommends SN74LVC1G125 variants with Ioff and power-down isolation.
CAHCT1G125QDCKRG4Q 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
CAHCT1G125QDCKRG4Q FAQ
1.How can I place an order for CAHCT1G125QDCKRG4Q through Aetrix?
Please submit a Request for Quotation (RFQ) for CAHCT1G125QDCKRG4Q 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 CAHCT1G125QDCKRG4Q reliable?
The price and inventory of CAHCT1G125QDCKRG4Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAHCT1G125QDCKRG4Q is usually 5 days.
3.What payment methods are accepted for CAHCT1G125QDCKRG4Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAHCT1G125QDCKRG4Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAHCT1G125QDCKRG4Q?
CAHCT1G125QDCKRG4Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAHCT1G125QDCKRG4Q 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 CAHCT1G125QDCKRG4Q?
For technical support, including CAHCT1G125QDCKRG4Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAHCT1G125QDCKRG4Q requirements.
6.How does Aetrix verify that CAHCT1G125QDCKRG4Q is sourced from the original manufacturer or authorized distributors?
All CAHCT1G125QDCKRG4Q 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 CAHCT1G125QDCKRG4Q meets industry standards.
7.What is the process for return or replacement of CAHCT1G125QDCKRG4Q?
All CAHCT1G125QDCKRG4Q units undergo pre-shipment inspection (PSI). If there is an issue with CAHCT1G125QDCKRG4Q, 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 CAHCT1G125QDCKRG4Q part is unused and in its original packaging.
Return procedure for CAHCT1G125QDCKRG4Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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