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Texas Instruments SN74AHCT125QDRG4Q1
- Part No.:
- SN74AHCT125QDRG4Q1
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHCT125QDRG4Q1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,903
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Product details
Overview
SN74AHCT125QDRG4Q1 from Texas Instruments is an automotive-grade quadruple bus buffer gate with independent 3-state outputs, operating from 4.5 V to 5.5 V over –40°C to 125°C, delivering ±8 mA output drive, 6.5 ns max propagation delay (CL = 15 pF), and TTL-compatible inputs - used for signal enable/disable, switch debouncing, and LED control in vehicle body electronics.
For engineers reviewing the SN74AHCT125QDRG4Q1 datasheet, SN74AHCT125QDRG4Q1 pinout, SN74AHCT125QDRG4Q1 application, or SN74AHCT125QDRG4Q1 equivalent, key selection criteria include AEC-Q100 qualification, individual OE control per channel, 3-state isolation capability, and SOIC-14 packaging for legacy board compatibility.
Technical Context
The SN74AHCT125QDRG4Q1 implements four independent non-inverting buffers, each with dedicated active-low output-enable (OE) control enabling per-channel 3-state output assertion. Its CMOS input stage accepts TTL-voltage levels (VIH = 2 V, VIL = 0.8 V), while its push-pull output stage supports rail-to-rail switching with defined VOH/VOL under load.
Each buffer operates in two functional modes: when OE is low, A → Y passes data with tPLH/tPHL ≤ 6.5 ns (CL = 15 pF); when OE is high, Y enters high-impedance state (IOZ ≤ ±2.5 µA). Power-up/down isolation is ensured by tying OE to VCC via pullup resistor, leveraging the device's current-sinking capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V automotive power rails and stable logic thresholds across temperature. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and cabin control modules. |
| Output Drive | ±8 mA - sufficient to directly drive LEDs, small logic loads, or interface with other 5 V CMOS/TTL inputs without external buffering. |
| Propagation Delay | ≤ 6.5 ns (CL = 15 pF) - enables reliable operation in medium-speed digital buses up to ~100 MHz toggle rate. |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - allows direct interfacing with legacy 5 V TTL outputs without level shifters. |
| 3-State Leakage | IOZ ≤ ±2.5 µA - guarantees minimal bus contention during high-impedance mode in shared-data-path applications. |
| ESD Rating | HBM ±2000 V, CDM ±1000 V - meets AEC-Q100-002/-011 for robustness in automotive assembly and field environments. |
Pinout & Package
SN74AHCT125QDRG4Q1 is packaged in a 14-pin SOIC (D package), 8.65 mm × 6 mm body size, with standard JEDEC MS-012AC footprint and gull-wing leads. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable input | Individually disables corresponding Y output into high-Z; tie to VCC via pullup for power-safe default disable. |
| 1A–4A | Buffer input | Non-inverting data input per channel; TTL-compatible threshold ensures interoperability with legacy drivers. |
| 1Y–4Y | Buffer output | Push-pull output with ±8 mA drive; enters high-impedance state when OE = HIGH, isolating downstream circuitry. |
| VCC (Pin 14) | Positive supply | Must be bypassed with 0.1 µF ceramic capacitor placed adjacent to pin to suppress switching noise and ensure stable operation. |
| GND (Pin 7) | Ground reference | Common return path for all channels; requires low-impedance PCB plane connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 1 (–40°C to +125°C) qualification confirmed - suitable for automotive powertrain, chassis, and body control units. |
| Individual Output Enables | Four separate OE pins allow selective channel activation - essential for dynamic bus arbitration and partial subsystem isolation. |
| TTL-Compatible Inputs | VIH = 2 V / VIL = 0.8 V thresholds eliminate need for external level translation when interfacing with older 5 V logic families. |
| Latch-Up Immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during transient overvoltage events in noisy automotive environments. |
| Functional Safety Support | Documentation available for ISO 26262 ASIL-B system integration - includes failure mode analysis and diagnostic coverage guidance. |
Applications
| Body Control Module Signal Routing | Instrument Cluster LED Driver Interface |
|---|---|
|
Use Scenario: Isolating microcontroller GPIO lines from shared CAN/LIN transceiver control signals during sleep/wake transitions. IC Role / Device Role / Timing Role: Bus buffer with per-channel 3-state control acts as bidirectional signal gate, preventing backfeed and ensuring clean wake-up sequencing. Use Value: Eliminates need for discrete MOSFET switches or additional logic; reduces BOM count and layout area while maintaining AEC-Q100 compliance. |
Use Scenario: Driving multiple status LEDs from a single MCU port with independent on/off control per indicator. IC Role / Device Role / Timing Role: Non-inverting buffer with TTL-compatible input and ±8 mA sink/source delivers direct LED current control without external drivers. Use Value: Enables software-configurable LED brightness via PWM on A inputs while OE pins manage group enable/disable - simplifies firmware and hardware design. |
| Door Module Switch Debounce Circuit | ADAS Camera Power Sequencing Interface |
|
Use Scenario: Conditioning mechanical switch inputs (e.g., door lock/unlock buttons) before feeding to safety-critical MCU inputs. IC Role / Device Role / Timing Role: Input buffer filters slow/noisy edges using internal hysteresis-free CMOS threshold; OE tied low for always-on operation. Use Value: Replaces RC+Schmitt trigger networks with single IC, improving ESD immunity and reducing component count in space-constrained modules. |
Use Scenario: Enabling/disabling clock or reset signals to camera sensor ICs during power-up/power-down sequences in surround-view systems. IC Role / Device Role / Timing Role: 3-state buffer gates isolate timing-sensitive sensor interfaces from MCU during voltage ramping, preventing metastability. Use Value: Ensures glitch-free clock/reset assertion by decoupling sensor domain from MCU domain - critical for ASIL-B compliant vision processing chains. |
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 (5 mm × 6.4 mm) package; identical electrical specs and AEC-Q100 qualification. | Smaller footprint and better thermal performance (RθJA = 147.7°C/W vs. 86°C/W), but requires rework of land pattern and stencil. | Select for new designs prioritizing board area reduction and thermal margin; not drop-in compatible with SOIC layouts. |
| SN74LVC125AQPWRQ1 | Lower VCC range (1.65 V–3.6 V); 3.3 V logic only; higher speed (tPD ≤ 4.2 ns), but no TTL input compatibility. | Requires level-shifting for legacy 5 V systems; unsuitable where mixed-voltage interfacing or direct TTL drive is needed. | Choose only for 3.3 V–only automotive domains (e.g., infotainment SoC I/O expansion); incompatible with 5 V signal sources. |
Compared with SN74AHCT125QPWRQ1 and SN74LVC125AQPWRQ1, the SN74AHCT125QDRG4Q1 uniquely combines SOIC-14 mechanical compatibility, full 5 V operation, TTL input support, and AEC-Q100 qualification - making it the sole option for retrofitting or cost-sensitive 5 V automotive control modules requiring pin-for-pin replacement.
Availability
SN74AHCT125QDRG4Q1 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster interfaces, door module switch conditioning, and ADAS camera power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT125QDRG4Q1 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 logic solutions, with decades of automotive qualification expertise and broad manufacturing scale.
The SN74AHCT125-Q1 product line delivers AEC-Q100-qualified, 5 V tolerant bus buffers designed specifically for signal routing, isolation, and interface conditioning in automotive electronic control units.
FAQ
What is the maximum capacitive load the SN74AHCT125QDRG4Q1 can drive while meeting all datasheet specifications?
The SN74AHCT125QDRG4Q1 is specified to drive loads up to 50 pF while maintaining guaranteed switching characteristics (e.g., tPLH ≤ 8.5 ns) and output voltage levels (VOH ≥ 3.8 V, VOL ≤ 0.44 V). Driving larger capacitances is possible but may degrade timing margins and increase propagation delay beyond published limits - verify performance empirically if CL > 50 pF is required in the final design.
Does the SN74AHCT125QDRG4Q1 support hot insertion or live insertion into a powered-backplane system?
The SN74AHCT125QDRG4Q1 does not support hot insertion. Its absolute maximum ratings specify that VCC must be applied before any input or output signal, and VI/VO must remain within –0.5 V to VCC + 0.5 V at all times. Applying signals before VCC risks exceeding input clamp current limits (±20 mA) and may cause latch-up or permanent damage - power sequencing must be controlled externally.
Can unused inputs on the SN74AHCT125QDRG4Q1 be left floating, or must they be terminated?
Unused inputs on the SN74AHCT125QDRG4Q1 must never be left floating. TI explicitly requires all unused inputs to be tied to either VCC or GND to prevent undefined logic states, increased power consumption, and potential oscillation. A 10 kΩ pullup or pulldown resistor is recommended for flexibility; direct connection is acceptable if the state is fixed and noise immunity is sufficient.
Is the SN74AHCT125QDRG4Q1 pin-compatible with the commercial-grade SN74AHCT125?
Yes, the SN74AHCT125QDRG4Q1 is pin-compatible and functionally identical to the commercial SN74AHCT125 in SOIC-14 packaging, sharing the same pinout, electrical behavior, and logic functionality. The key difference is automotive qualification: SN74AHCT125QDRG4Q1 undergoes AEC-Q100 stress testing and is screened for –40°C to +125°C operation, whereas the commercial version is rated only to 85°C.
What is the recommended bypass capacitor value and placement for the SN74AHCT125QDRG4Q1 VCC pin?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 14) of the SN74AHCT125QDRG4Q1, with short, low-inductance traces to GND. This minimizes supply noise during switching transitions. For enhanced high-frequency filtering, a parallel 1 µF capacitor may be added nearby - but the 0.1 µF unit must be physically adjacent to the IC to suppress fast-edge transients effectively.
SN74AHCT125QDRG4Q1 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
SN74AHCT125QDRG4Q1 FAQ
1.How can I place an order for SN74AHCT125QDRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT125QDRG4Q1 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 SN74AHCT125QDRG4Q1 reliable?
The price and inventory of SN74AHCT125QDRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT125QDRG4Q1 is usually 5 days.
3.What payment methods are accepted for SN74AHCT125QDRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT125QDRG4Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT125QDRG4Q1?
SN74AHCT125QDRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT125QDRG4Q1 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 SN74AHCT125QDRG4Q1?
For technical support, including SN74AHCT125QDRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT125QDRG4Q1 requirements.
6.How does Aetrix verify that SN74AHCT125QDRG4Q1 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT125QDRG4Q1 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 SN74AHCT125QDRG4Q1 meets industry standards.
7.What is the process for return or replacement of SN74AHCT125QDRG4Q1?
All SN74AHCT125QDRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT125QDRG4Q1, 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 SN74AHCT125QDRG4Q1 part is unused and in its original packaging.
Return procedure for SN74AHCT125QDRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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