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Texas Instruments CAHCT1G125QDBVRQ1
- Part No.:
- CAHCT1G125QDBVRQ1
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
CAHCT1G125QDBVRQ1.pdf
- Description:
- AUTOMOTIVE SINGLE 3V TO 5.5V BUF
- Quantity:
- Payment:
- Shipping:
Inventory:470
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Product details
Overview
CAHCT1G125QDBVRQ1 from Texas Instruments is an automotive-qualified single 3-state bus buffer gate used for digital signal enable/disable control in power-sensitive, high-reliability systems. It operates from 3 V to 5.5 V, delivers ±8-mA output drive at 5 V, achieves 6 ns max propagation delay at 5 V, and consumes ≤10 µA ICC in quiescent state - enabling robust signal routing in vehicle body control modules and infotainment interfaces.
For engineers reviewing the CAHCT1G125QDBVRQ1 datasheet, CAHCT1G125QDBVRQ1 pinout, CAHCT1G125QDBVRQ1 application, or CAHCT1G125QDBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), TTL-compatible inputs, SOT-23-5 package footprint, and precise 3-state timing behavior under automotive supply and temperature stress.
Technical Context
The CAHCT1G125QDBVRQ1 implements a single-channel non-inverting buffer with active-low 3-state output control. Its OE input directly disables the Y output into high-impedance mode without inversion, supporting bidirectional bus isolation and controlled signal gating in mixed-voltage subsystems.
It uses advanced AHCT logic architecture optimized for TTL-level compatibility across 3–5.5 V operation, with guaranteed switching performance down to 3 V and ESD robustness per AEC-Q100-002 (±2 kV HBM). Thermal resistance is 278.0°C/W (RθJA, DBV package), validated for continuous operation in engine bay and cabin-mounted ECUs.
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 microcontrollers and legacy automotive peripherals without level-shifting. |
| Max Propagation Delay | 6 ns at VCC = 5 V, CL = 15 pF - ensures sub-10 ns timing margin for 100 MHz+ clock domain synchronization in CAN/LIN gateway logic. |
| Output Drive Strength | ±8 mA at VCC = 5 V - sufficient to directly drive LEDs, small-signal MOSFET gates, or multiple 74-series inputs without external buffering. |
| Quiescent Supply Current | ≤10 µA - enables always-on monitoring circuits in low-power wake-up paths without compromising battery drain budgets. |
| Input Voltage Compatibility | TTL-compatible (VIH = 2 V min at 4.5–5.5 V) - allows seamless integration with legacy 5 V logic families while powered from modern 3.3 V rails. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and dashboard-mounted applications. |
| ESD Rating | ±2000 V HBM - meets automotive system-level ESD immunity requirements for exposed I/O lines in junction boxes and sensors. |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm footprint, 1.45 mm max height, gull-wing leads, RoHS-compliant matte tin (Sn) finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-low 3-state enable input | Drives Y to high-Z when high; ties to VCC via pullup for defined state during power-up/down sequences. |
| 2 - A | Buffer input | Accepts TTL-compatible signals; no internal pullup/pulldown - must be driven or externally terminated. |
| 3 - GND | Ground reference | Primary return path for logic and output current; requires low-inductance connection to PCB ground plane. |
| 4 - Y | 3-state non-inverting output | Delivers true A signal when OE = low; presents >10⁹ Ω impedance when OE = high - isolates downstream loads. |
| 5 - VCC | Power supply | Must be bypassed with 0.1 µF ceramic capacitor placed ≤2 mm from pin to suppress switching noise and ensure stable rail integrity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 1 (–40°C to +125°C) - certified for safety-critical automotive functions including door module control and lighting drivers. |
| True 3-State Output | No shoot-through or leakage during transition - enables hot-swappable bus expansion and multi-master arbitration in LIN clusters. |
| Low-Power Quiescent Operation | ICC ≤ 10 µA across full voltage/temperature range - reduces standby power in always-on vehicle networks (e.g., CAN FD sleep-wake). |
| TTL-Compatible Inputs | VIH = 2 V min at 5 V supply - eliminates need for external level shifters when interfacing with legacy 5 V sensors or microcontrollers. |
| Fast Switching at Low Voltage | tPLH/tPHL = 8.1 ns max at VCC = 3 V, CL = 50 pF - maintains timing integrity in 3.3 V ADAS subsystems with long trace runs. |
Applications
| Body Control Module Signal Gating | LED Driver Enable Interface |
|---|---|
Use Scenario: Isolating diagnostic communication lines between BCM MCU and door/window actuator ICs during firmware updates. IC Role / Device Role / Timing Role: Single-channel 3-state buffer enabling/disabling UART or PWM signals without disrupting shared bus topology. Use Value: Prevents spurious actuation during reprogramming by forcing high-Z on control lines - verified at 125°C ambient with <10 ns timing skew. |
Use Scenario: Controlling brightness-modulated status LEDs in instrument cluster backlighting circuits. IC Role / Device Role / Timing Role: Enabling current-sinking LED driver outputs only when system is awake and fault-free. Use Value: Delivers ±8 mA sink/source at 5 V to drive dual-color LEDs directly - eliminates discrete transistor stage and saves 2.5 mm² PCB area. |
| Automotive Sensor Data Multiplexing | LIN Bus Transceiver Interface Logic |
Use Scenario: Selectively routing analog sensor outputs (e.g., cabin temp, humidity) to ADC inputs based on mode (HVAC vs. climate control). IC Role / Device Role / Timing Role: Buffering and enabling analog front-end signals while maintaining signal integrity via high-Z isolation. Use Value: Input capacitance of 10 pF and VOL ≤ 0.52 V at 8 mA minimize loading on precision op-amp outputs - preserves <0.1% gain error. |
Use Scenario: Conditioning MCU GPIO signals before feeding LIN transceiver TX/RX pins in body electronics nodes. IC Role / Device Role / Timing Role: Level-shifting and buffering 3.3 V MCU logic to meet LIN physical layer voltage thresholds (dominant/recessive levels). Use Value: Guaranteed VOH ≥ 4.4 V at 5 V supply ensures reliable dominant-state detection - validated across –40°C to +125°C with 15 pF load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G125QDBVRQ1 | Lower VCC range (1.65–5.5 V); higher speed (tPD = 3.7 ns @ 3.3 V); CMOS input thresholds (not TTL-compatible) | Better suited for 1.8 V/3.3 V-only systems; cannot replace CAHCT1G125QDBVRQ1 in mixed 5 V legacy designs without input voltage adaptation | Select when migrating to lower-voltage domains and full CMOS compatibility is required; verify VIH/VIL alignment with upstream drivers. |
| MC74VHC1G125DTT1G | Same 3–5.5 V range and TTL-compatible inputs; slightly higher ICC (20 µA max); not AEC-Q100 qualified | Lacks automotive qualification and extended temperature validation - limited to industrial or consumer-grade modules | Use only in non-safety-critical, non-under-hood applications where cost is prioritized over automotive compliance and thermal margin. |
Compared with SN74LVC1G125QDBVRQ1 and MC74VHC1G125DTT1G, the CAHCT1G125QDBVRQ1 uniquely combines AEC-Q100 Grade 1 certification, TTL input compatibility, and ≤10 µA ICC - making it the sole choice for legacy 5 V automotive subsystems requiring zero-risk drop-in replacement and guaranteed high-temperature reliability.
Availability
CAHCT1G125QDBVRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, LED driver interfaces, and LIN bus node designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CAHCT1G125QDBVRQ1 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 with over 50 years of automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The SN74AHCT1G125-Q1 belongs to TI's automotive logic portfolio, designed specifically for signal conditioning, bus isolation, and interface bridging in harsh-environment vehicle electronics - emphasizing AEC-Q100 compliance, low power, and robust ESD tolerance.
FAQ
What is the operating temperature range for the CAHCT1G125QDBVRQ1?
The CAHCT1G125QDBVRQ1 is qualified per AEC-Q100 Grade 1 with an operating free-air temperature range of –40°C to +125°C. This rating is validated across all electrical parameters in the datasheet, including propagation delay, output drive, and quiescent current - ensuring reliable operation in engine compartment, powertrain, and cabin-mounted electronic control units. The CAHCT1G125QDBVRQ1 maintains full functionality without derating throughout this range.
Does the CAHCT1G125QDBVRQ1 support 3.3 V logic systems?
Yes, the CAHCT1G125QDBVRQ1 operates from 3 V to 5.5 V and is fully specified at 3 V supply, including switching characteristics (tPLH/tPHL ≤ 12 ns at CL = 15 pF) and DC parameters (VOH ≥ 2.9 V, VOL ≤ 0.52 V). Its TTL-compatible inputs accept 3.3 V logic highs as valid, making the CAHCT1G125QDBVRQ1 suitable for mixed-voltage 3.3 V/5 V automotive interfaces without level translation.
What is the recommended bypass capacitor for the CAHCT1G125QDBVRQ1?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed within 2 mm of the VCC pin (Pin 5) and connected directly to the GND pin (Pin 3) to suppress high-frequency switching noise. For enhanced noise rejection across broader frequency bands, paralleling a 1 µF capacitor is acceptable - but the 0.1 µF unit is mandatory for stable operation of the CAHCT1G125QDBVRQ1, especially under fast edge-rate conditions.
How does the CAHCT1G125QDBVRQ1 behave during power-up?
The CAHCT1G125QDBVRQ1 has no internal power-on reset; its outputs enter an undefined state until VCC stabilizes and inputs settle. To guarantee high-impedance output at power-up, OE (Pin 1) must be tied to VCC via an external pullup resistor - minimum value determined by the driving source's sink capability. This design practice prevents bus contention and is explicitly required in the CAHCT1G125QDBVRQ1 functional description.
Is the CAHCT1G125QDBVRQ1 pin-compatible with other 5-pin SOT-23 logic buffers?
The CAHCT1G125QDBVRQ1 uses standard SOT-23-5 pinout (OE-A-GND-Y-VCC), matching industry-standard 5-pin logic buffers including SN74LVC1G125QDBVRQ1 and SN74AHC1G125DBVR. Mechanical compatibility is confirmed by JEDEC MO-178 outline DBV0005A. However, electrical behavior (e.g., input threshold, drive strength, ICC) differs - so functional substitution requires verification against system-level timing and voltage margins.
CAHCT1G125QDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
CAHCT1G125QDBVRQ1 FAQ
1.How can I place an order for CAHCT1G125QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAHCT1G125QDBVRQ1 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 CAHCT1G125QDBVRQ1 reliable?
The price and inventory of CAHCT1G125QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAHCT1G125QDBVRQ1 is usually 5 days.
3.What payment methods are accepted for CAHCT1G125QDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAHCT1G125QDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAHCT1G125QDBVRQ1?
CAHCT1G125QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAHCT1G125QDBVRQ1 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 CAHCT1G125QDBVRQ1?
For technical support, including CAHCT1G125QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAHCT1G125QDBVRQ1 requirements.
6.How does Aetrix verify that CAHCT1G125QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All CAHCT1G125QDBVRQ1 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 CAHCT1G125QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of CAHCT1G125QDBVRQ1?
All CAHCT1G125QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with CAHCT1G125QDBVRQ1, 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 CAHCT1G125QDBVRQ1 part is unused and in its original packaging.
Return procedure for CAHCT1G125QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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