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Nexperia USA Inc. 74HCT125D/AUJ
- Part No.:
- 74HCT125D/AUJ
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT125D/AUJ.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,523
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Product details
Overview
74HCT125D/AUJ from Nexperia is a quad 3-state buffer/line driver IC with TTL-compatible inputs, operating from 4.5 V to 5.5 V, featuring 15 ns typical propagation delay at 5 V and 50 pF load, ±6 mA output drive, and -40 °C to +125 °C industrial temperature range - used for bus isolation and signal routing in microcontroller peripheral interfaces.
For engineers reviewing the 74HCT125D/AUJ datasheet, 74HCT125D/AUJ pinout, 74HCT125D/AUJ application, or 74HCT125D/AUJ equivalent, key selection criteria include TTL-level input compatibility, SO14 package thermal performance, 3-state enable timing (15 ns enable/disable), and static drive capability under wide-temperature industrial operation.
Technical Context
The 74HCT125D/AUJ implements four independent non-inverting buffers, each with active-low 3-state output enable (nOE) controlling high-impedance OFF-state. Its TTL-input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure direct interfacing with legacy 5 V logic families without level translation.
Each buffer supports bidirectional bus control via independent nOE pins (pins 1, 4, 10, 13), enabling selective line activation while maintaining low ICC (8 μA typical) and high noise immunity (Δt/ΔV ≥ 139 ns/V at 4.5 V). Input clamp diodes allow safe overvoltage tolerance when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and mixed-voltage systems without regulator overhead. |
| Propagation Delay | 15 ns typical (nA to nY, VCC = 4.5 V, CL = 50 pF) - enables reliable 33 MHz bus operation with margin. |
| Output Drive | ±6 mA (VOH/VOL at VCC = 4.5 V) - sufficient to drive 10 LSTTL loads or 50 pF transmission lines directly. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees robust recognition of TTL logic levels across temperature. |
| Operating Temperature | -40 °C to +125 °C - supports under-hood, industrial PLC, and extended-range embedded applications. |
| Power Dissipation | CPD = 24 pF - determines dynamic power as PD = CPD × VCC² × fi × N, critical for thermal budgeting in dense layouts. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - meets IEC 61000-4-2 Level 2 requirements for board-level robustness. |
Pinout & Package
74HCT125D/AUJ uses the SOT108-1 (SO14) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, JEDEC MS-012 compliant, with gull-wing leads suitable for reflow soldering and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 (nOE) | Active-low output enable | Individually disables each buffer's output to high-impedance state; tied LOW to enable, HIGH to isolate. |
| 2, 5, 9, 12 (nA) | Data input | Non-inverting TTL-compatible input; clamped diodes permit safe interface to voltages > VCC with series resistor. |
| 3, 6, 8, 11 (nY) | Data output | 3-state buffered output; drives bus or load only when corresponding nOE is LOW. |
| 7 (GND) | Ground reference | 0 V return path for all internal circuitry and output currents; must be low-inductance connection. |
| 14 (VCC) | Supply voltage | +5 V nominal supply; decoupling capacitor (100 nF ceramic) required within 10 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min / VIL = 0.8 V max at 5 V - eliminates need for external level shifters when interfacing with 5 V microcontrollers or FPGAs. |
| Independent 3-state control | Four separate nOE pins - enables per-line bus arbitration in multi-master systems without shared enable logic. |
| Wide temperature operation | -40 °C to +125 °C - validated for use in automotive engine control modules and industrial motor drives without derating. |
| Low quiescent current | ICC = 8 μA typical at 25 °C - reduces standby power in battery-backed or always-on subsystems. |
| Input clamp diodes | Integrated ESD protection diodes - allows safe interfacing to signals up to VCC + 0.5 V using simple series resistors (e.g., 1 kΩ). |
Applications
| Microcontroller Bus Isolation | Industrial Sensor Interface |
|---|---|
Use Scenario: Isolating multiple SPI peripherals on a shared bus to prevent contention during firmware updates. IC Role / Device Role / Timing Role: Quad buffer acts as directional gate, enabling one peripheral at a time while tri-stating others to avoid signal collisions. Use Value: Eliminates need for discrete MOSFET switches or complex bus arbitration logic; 15 ns propagation delay preserves SPI timing margins up to 33 MHz. |
Use Scenario: Interfacing analog sensor outputs (e.g., 4–20 mA transmitters) to a PLC's digital input module with galvanic isolation. IC Role / Device Role / Timing Role: Buffers and level-shifts isolated digital status signals into the PLC backplane, synchronized via common nOE strobe. Use Value: Provides clean, noise-immune signal conditioning with TTL-compatible thresholds, supporting operation across full -40 °C to +125 °C ambient range. |
| Legacy System Signal Translation | Test Equipment Signal Routing |
Use Scenario: Upgrading a 1990s industrial controller by replacing obsolete 74LS125 with pin-compatible CMOS logic. IC Role / Device Role / Timing Role: Direct drop-in replacement delivering identical TTL input behavior but lower power and higher noise immunity. Use Value: Maintains existing PCB layout and firmware while reducing system power by >90% and improving ESD resilience per IEC 61000-4-2. |
Use Scenario: Dynamic reconfiguration of signal paths in automated test equipment (ATE) during functional test sequences. IC Role / Device Role / Timing Role: Enables software-controlled routing of stimulus/response signals between DUT and measurement instruments via parallel nOE control. Use Value: Achieves sub-20 ns path switching with guaranteed monotonic transitions, avoiding glitches during test vector changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT125PW | TSSOP14 package (SOT402-1); 0.65 mm lead pitch; 4.4 mm body width; 7.3 mW/K thermal derating above 81 °C. | Better PCB space efficiency and thermal performance in high-density layouts; requires finer-pitch reflow profile. | Select for compact designs where SO14 footprint is prohibitive; verify solder paste volume and stencil aperture for 0.65 mm pitch. |
| SN74HCT125DR | Texas Instruments part; identical logic function and DC specs; slightly longer disable time (38 ns max vs 32 ns max at 4.5 V). | Validated for TI-specific reference designs; same pinout but different thermal resistance (RθJA = 120 K/W vs Nexperia's 100 K/W). | Choose when sourcing from TI-authorized channels or when aligning with TI ecosystem documentation and simulation models. |
Compared with 74HCT125PW, the 74HCT125D/AUJ offers superior thermal stability above 100 °C due to SO14's lower RθJA and linear derating (10.1 mW/K), while SN74HCT125DR provides identical functionality with minor timing variation and distinct qualification history - making D/AUJ optimal for high-reliability industrial environments requiring long-term thermal margin.
Availability
74HCT125D/AUJ is available at Aetrix Electronics and suitable for industrial automation controllers, automotive diagnostic tools, and embedded test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT125D/AUJ 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions with emphasis on reliability and sustainability.
The 74HCT125 belongs to Nexperia's industry-standard logic family designed for robust, low-power signal buffering and bus management in industrial, consumer, and communications equipment.
FAQ
What is the maximum clock frequency supported by 74HCT125D/AUJ in a bus-driving application?
The 74HCT125D/AUJ has a typical propagation delay of 15 ns (VCC = 4.5 V, CL = 50 pF), supporting reliable operation up to approximately 33 MHz in synchronous bus applications. Maximum usable frequency depends on total capacitive load and signal integrity; for 100 pF loads, delay increases to ~25 ns, limiting practical use to ≤20 MHz with timing margin.
Can 74HCT125D/AUJ drive a 50 Ω transmission line directly?
No - the 74HCT125D/AUJ is not designed for 50 Ω line driving. Its ±6 mA output drive corresponds to ~830 Ω effective impedance at 5 V, making it suitable for unterminated stubs or loads ≥ 1 kΩ. For 50 Ω lines, use a dedicated line driver (e.g., SN65LVDS1) or add series termination.
Is 74HCT125D/AUJ qualified for automotive applications?
No - 74HCT125D/AUJ is specified for -40 °C to +125 °C operation but is not AEC-Q100 qualified. Nexperia does not list it in their automotive-grade portfolio. For automotive use, select the AEC-Q100 qualified 74HCT125-Q100 variant (e.g., 74HCT125DP-Q100 in SO14).
How does the input clamp diode affect interfacing with 12 V sensors?
The integrated input clamp diodes allow safe interface to voltages up to VCC + 0.5 V. To connect a 12 V sensor, use a series current-limiting resistor (e.g., 10 kΩ) to restrict IIK to < ±20 mA, ensuring VI remains within absolute max ratings. Do not exceed 20 mA continuous clamp current.
74HCT125D/AUJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
74HCT125D/AUJ FAQ
1.How can I place an order for 74HCT125D/AUJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT125D/AUJ 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 74HCT125D/AUJ reliable?
The price and inventory of 74HCT125D/AUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT125D/AUJ is usually 5 days.
3.What payment methods are accepted for 74HCT125D/AUJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT125D/AUJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT125D/AUJ?
74HCT125D/AUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT125D/AUJ 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 74HCT125D/AUJ?
For technical support, including 74HCT125D/AUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT125D/AUJ requirements.
6.How does Aetrix verify that 74HCT125D/AUJ is sourced from the original manufacturer or authorized distributors?
All 74HCT125D/AUJ 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 74HCT125D/AUJ meets industry standards.
7.What is the process for return or replacement of 74HCT125D/AUJ?
All 74HCT125D/AUJ units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT125D/AUJ, 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 74HCT125D/AUJ part is unused and in its original packaging.
Return procedure for 74HCT125D/AUJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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