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Texas Instruments SN74AHCT125QDRQ1
- Part No.:
- SN74AHCT125QDRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHCT125QDRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,374
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Product details
Overview
SN74AHCT125QDRQ1 from Texas Instruments is an automotive-grade quadruple bus buffer gate with independent 3-state outputs, designed for signal isolation and controlled data routing in harsh environments. It operates from 4.5 V to 5.5 V, supports TTL-voltage-compatible inputs (VIH = 2 V, VIL = 0.8 V), delivers ±8 mA output drive, and functions across –40°C to +125°C for engine control, body electronics, and ADAS subsystems.
For engineers reviewing the SN74AHCT125QDRQ1 datasheet, SN74AHCT125QDRQ1 pinout, SN74AHCT125QDRQ1 application, or SN74AHCT125QDRQ1 equivalent, key selection criteria include its AEC-Q100 qualified SOIC-14 package, individual OE control per channel, 3-state output behavior, and functional safety documentation support for ISO 26262-compliant designs.
Technical Context
This device implements four independent non-inverting buffers, each with dedicated output-enable (OE) logic that places the Y output in high-impedance state when OE = HIGH and passes A→Y when OE = LOW. Its CMOS input structure requires fast transitions (<20 ns/V) and mandates termination of unused inputs to VCC or GND.
It features latch-up immunity exceeding 250 mA per JESD17, HBM ESD rating of ±2000 V, and CDM rating of ±1000 V. The 3-state architecture enables bidirectional bus sharing, while its 5-V supply compatibility and TTL input thresholds simplify integration with legacy microcontrollers and sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation under automotive battery transients and cold-crank conditions. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and powertrain applications per AEC-Q100 Grade 1. |
| Output Drive | ±8 mA - sufficient to drive standard CMOS loads and small indicator LEDs without external buffering. |
| Propagation Delay | 3.8 ns (min) to 6.5 ns (max) at CL = 15 pF - enables reliable timing in 50-MHz digital control loops. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - compatible with 5-V TTL logic families and robust against noise in noisy vehicle environments. |
| Quiescent Current | ICC ≤ 20 µA - minimizes standby power in always-on modules like gateway ECUs. |
| ESD Rating | HBM ±2000 V - meets automotive system-level ESD immunity requirements without additional protection circuitry. |
Pinout & Package
SN74AHCT125QDRQ1 is supplied in a 14-pin SOIC (D) package measuring 8.65 mm × 6 mm, with gull-wing leads and RoHS-compliant NiPdAu plating. It has a moisture sensitivity level (MSL) of Level-1 and is rated for peak reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Individually disables each buffer's output to high-impedance; tie to VCC via pullup for safe power-up state. |
| 1A–4A | Buffer input | CMOS-compatible data inputs; must be terminated to VCC or GND if unused to prevent floating-induced oscillation. |
| 1Y–4Y | Buffer output | Non-inverting 3-state outputs; capable of sourcing/sinking ±8 mA while maintaining VOL ≤ 0.44 V and VOH ≥ 3.94 V. |
| VCC (Pin 14) | Positive supply | 5-V nominal rail; requires local 0.1 µF bypass capacitor placed adjacent to pin for noise suppression. |
| GND (Pin 7) | Ground reference | Common return path for all channels; must be low-impedance to support transient current during switching. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-voltage compatible inputs | Accepts standard 5-V TTL logic levels (VIH ≥ 2 V, VIL ≤ 0.8 V), enabling direct interface with legacy microcontrollers and sensors. |
| Individual 3-state control per channel | Four independent OE pins allow selective bus arbitration-critical for multi-master communication and modular signal routing. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +125°C ambient, including temperature cycling, humidity bias, and HTOL stress testing. |
| Functional safety documentation support | Includes FIT rate data, failure mode analysis, and safety manual to accelerate ASIL-B system-level certification per ISO 26262. |
| Latch-up immunity >250 mA | Withstands high-current transients per JESD17, reducing risk of catastrophic failure during load dump or ground bounce events. |
Applications
| Engine Control Unit (ECU) Signal Isolation | Body Control Module (BCM) LED Driver Interface |
|---|---|
|
Use Scenario: Isolating sensor data lines between MCU and analog front-end during firmware updates or diagnostic modes. IC Role / Device Role / Timing Role: Bus buffer with per-channel 3-state control acts as a configurable signal gate, preventing back-driving during partial system resets. Use Value: Enables hot-swappable module replacement without powering down entire ECU; maintains signal integrity with <6.5 ns propagation delay and ±8 mA drive. |
Use Scenario: Driving multiple status LEDs from a single microcontroller port while minimizing GPIO count. IC Role / Device Role / Timing Role: Non-inverting buffer with TTL-compatible inputs translates MCU logic levels to LED sink/source paths with independent enable control. Use Value: Eliminates need for discrete transistors; each channel drives up to 8 mA directly, supporting common-anode or common-cathode configurations. |
| Automotive Gateway Data Multiplexing | ADAS Camera Interface Signal Conditioning |
|
Use Scenario: Managing shared data lines between CAN, LIN, and Ethernet subsystems in domain controller architectures. IC Role / Device Role / Timing Role: Quad buffer provides isolated, direction-controlled signal paths with simultaneous or staggered enable sequencing. Use Value: Prevents bus contention during protocol handshaking; high-impedance state isolates inactive domains with <0.25 µA leakage current. |
Use Scenario: Cleaning slow-rising or noisy clock/data signals from image sensor interfaces before feeding to FPGA or SoC. IC Role / Device Role / Timing Role: Input conditioning buffer sharpens edges and rejects sub-20 ns/V noise using CMOS threshold stability and fast switching. Use Value: Reduces bit errors in LVDS/MIPI-CSI2 pre-processing stages; supports 50-pF max load while maintaining <7.5 ns tPHL at 25°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125QPWRQ1 | TSSOP-14 package (5 mm × 6.4 mm); higher thermal resistance (RθJA = 147.7°C/W vs. 86°C/W). | Better suited for space-constrained PCB layouts where SOIC footprint is prohibitive; lower power density handling. | Select when board area is critical and thermal margin allows for higher junction temperature rise. |
| SN74LVC125AQPWRQ1 | Lower voltage operation (1.65–3.6 V), 24 mA drive, but not TTL-input compatible; different VIH/VIL thresholds. | Targets modern low-voltage MCUs and FPGAs; incompatible with 5-V TTL signaling without level translation. | Choose only for 3.3-V systems requiring higher drive strength; not a drop-in replacement for SN74AHCT125QDRQ1. |
Compared with SN74AHCT125QPWRQ1 and SN74LVC125AQPWRQ1, the SN74AHCT125QDRQ1 uniquely combines 5-V TTL compatibility, SOIC-14 mechanical robustness, and AEC-Q100 Grade 1 qualification-making it the preferred choice for legacy 5-V automotive subsystems requiring proven reliability and minimal layout change.
Availability
SN74AHCT125QDRQ1 is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT125QDRQ1 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 ICs, with over 50 years of innovation in high-reliability electronics.
The SN74AHCT125QDRQ1 belongs to TI's automotive logic portfolio, engineered specifically for signal integrity, noise immunity, and functional safety in vehicle networking and control systems.
FAQ
What is the maximum capacitive load SN74AHCT125QDRQ1 can drive while meeting datasheet timing specs?
The SN74AHCT125QDRQ1 is characterized for loads up to 50 pF in the switching characteristics table. At CL = 50 pF, tPHL/tPLH remain within 8.5 ns (max), and tPHZ/tPLZ within 10 ns (max). Exceeding 50 pF increases propagation delay nonlinearly and may violate setup/hold margins in high-speed interfaces. For heavier loads, add series termination or consider a driver with higher current capability.
How should unused inputs be handled on SN74AHCT125QDRQ1 to ensure reliable operation?
All unused inputs on SN74AHCT125QDRQ1 must be tied to either VCC or GND-never left floating. Floating CMOS inputs cause increased ICC, oscillation, and potential latch-up. A 10-kΩ pullup or pulldown resistor is recommended for unused OE or A pins, balancing leakage current (±0.1 µA) and transition speed. Direct connection is acceptable if the pin will never be driven.
Does SN74AHCT125QDRQ1 support hot insertion or live bus connection?
SN74AHCT125QDRQ1 is not explicitly rated for hot insertion. Its absolute maximum ratings specify VI and VO limits (–0.5 V to VCC + 0.5 V), and IOK clamp current is ±20 mA. While the 3-state outputs reduce risk during insertion, TI recommends powering the device before applying signal voltages. Use external series resistors or dedicated hot-swap controllers for true live-connect applications.
What is the purpose of the pullup resistor on OE pins during power-up?
A pullup resistor on each OE pin ensures the output remains in high-impedance state during power ramp-up or brownout, preventing unintended signal contention or back-driving on shared buses. The minimum value depends on the driver's current-sinking capability-TI recommends values ≥10 kΩ to limit current while ensuring fast disable timing, especially given the device's 1 µA II input leakage.
Is SN74AHCT125QDRQ1 pin-compatible with non-automotive SN74AHCT125 variants?
Yes-SN74AHCT125QDRQ1 shares identical pinout, electrical behavior, and SOIC-14 package dimensions with the commercial SN74AHCT125 and enhanced product SN74AHCT125-EP. Differences are limited to qualification testing (AEC-Q100), screening, and lifetime reliability data-not pin function or layout. PCBs designed for SN74AHCT125 can use SN74AHCT125QDRQ1 without modification.
SN74AHCT125QDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74AHCT125QDRQ1 FAQ
1.How can I place an order for SN74AHCT125QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT125QDRQ1 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 SN74AHCT125QDRQ1 reliable?
The price and inventory of SN74AHCT125QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT125QDRQ1 is usually 5 days.
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SN74AHCT125QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT125QDRQ1 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 SN74AHCT125QDRQ1?
For technical support, including SN74AHCT125QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT125QDRQ1 requirements.
6.How does Aetrix verify that SN74AHCT125QDRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT125QDRQ1 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 SN74AHCT125QDRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHCT125QDRQ1?
All SN74AHCT125QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT125QDRQ1, 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 SN74AHCT125QDRQ1 part is unused and in its original packaging.
Return procedure for SN74AHCT125QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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