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NXP Semiconductors 74HCT125D/AU118
- Part No.:
- 74HCT125D/AU118
- Manufacturer:
- NXP Semiconductors
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT125D/AU118.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,896
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Product details
Overview
74HCT125D/AU118 from Nexperia is a quad 3-state buffer/line driver IC with TTL-compatible inputs, operating from 4.5 V to 5.5 V supply, delivering propagation delay ≤25 ns (VCC = 4.5 V, CL = 50 pF), ±6 mA output drive, and high-impedance outputs controlled by active-low enable pins. It serves in bus interface and signal isolation applications within industrial control and digital logic systems.
For engineers reviewing the 74HCT125D/AU118 datasheet, 74HCT125D/AU118 pinout, 74HCT125D/AU118 application, or 74HCT125D/AU118 equivalent, key selection criteria include TTL-level input compatibility, SO14 package footprint, 3-state bus-driving capability, -40 °C to +125 °C temperature rating, and low static current (≤160 μA at 125 °C).
Technical Context
The 74HCT125D/AU118 implements four independent non-inverting buffers, each with dedicated active-low output enable (nOE) controlling high-impedance state. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure direct interfacing with legacy 5 V TTL logic families without level shifting.
Each buffer supports bidirectional bus control via independent 3-state outputs, with guaranteed VOH ≥3.7 V and VOL ≤0.4 V under 6 mA load at 125 °C. Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - matches standard 5 V TTL system rails; avoids level translation circuitry |
| Input logic type | TTL-compatible - accepts standard 5 V TTL VIH/VIL thresholds, enabling plug-in replacement of 74LS125 |
| Propagation delay | ≤25 ns at VCC = 4.5 V, CL = 50 pF - ensures timing compliance in 20 MHz+ synchronous bus environments |
| Output drive | ±6 mA - sufficient to drive 10 LSTTL loads or 50 pF capacitive bus lines |
| Operating temperature | -40 °C to +125 °C - qualified for extended industrial and under-hood automotive auxiliary applications |
| Static supply current | ≤160 μA at +125 °C - enables low-power standby modes in always-on control modules |
| Input capacitance | 3.5 pF - minimizes loading on upstream drivers and preserves signal integrity in high-speed routing |
Pinout & Package
74HCT125D/AU118 uses the SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, surface-mount, JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | nOE₁–nOE₄ | Active-low output enable inputs - each controls one buffer's output state independently |
| 2, 5, 9, 12 | nA₁–nA₄ | Buffer data inputs - accept TTL-level signals; include clamp diodes for overvoltage tolerance |
| 3, 6, 8, 11 | nY₁–nY₄ | 3-state non-inverting outputs - present high-Z state when corresponding nOE is HIGH |
| 7 | GND | Ground reference - common return path for all internal logic and I/O |
| 14 | VCC | Positive supply - powers CMOS core; must be decoupled locally per best practice |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥2.0 V, VIL ≤0.8 V at VCC = 4.5–5.5 V - eliminates need for external level shifters when interfacing with 74LS/ALS families |
| High-noise immunity | Typical noise margin >1.0 V - suppresses false triggering in electrically noisy industrial environments |
| Latch-up robustness | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events |
| ESD protection | HBM >2000 V, CDM >1000 V - enhances handling survivability and board-level reliability without extra protection components |
| Wide temp range | Specified from -40 °C to +125 °C - supports operation in uncontrolled enclosures and thermally stressed PCB locations |
Applications
| Industrial Bus Interface | Digital Logic Isolation |
|---|---|
Use Scenario: Bidirectional data transfer between microcontroller GPIO and shared 8-bit parallel bus in PLC I/O modules. IC Role / Device Role / Timing Role: Quad buffer isolates MCU pins from bus loading while enabling/disabling segments via individual nOE lines. Use Value: Prevents bus contention during firmware updates; allows hot-swap of peripheral cards without resetting controller. | Use Scenario: Signal conditioning between mixed-voltage subsystems (e.g., 3.3 V FPGA and legacy 5 V sensor interface). IC Role / Device Role / Timing Role: Level-tolerant buffer provides direction-controlled isolation with sub-25 ns delay and no DC coupling. Use Value: Eliminates need for discrete resistor networks or dedicated level translators; reduces BOM count and layout area. |
| Test Equipment Signal Routing | Automotive Diagnostic Interface |
Use Scenario: Multiplexing test signals across multiple DUT channels in automated functional testers. IC Role / Device Role / Timing Role: 3-state outputs enable time-division sharing of single measurement line among 4 DUTs. Use Value: Reduces channel count and cabling complexity; maintains signal fidelity up to 20 MHz due to low transition time (≤12 ns). | Use Scenario: Isolating diagnostic CAN transceiver TX/RX lines from ECU microcontroller during firmware reflash. IC Role / Device Role / Timing Role: Buffer placed between MCU UART and transceiver, enabled only during active communication. Use Value: Prevents spurious bus activity during bootloader mode; meets ISO 11898-2 electrical robustness requirements via clamped inputs. |
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 (4.4 mm width); 7.3 mW/K power derating above 81 °C vs. SO14's 10.1 mW/K above 100 °C | Higher density PCB layout; lower thermal mass; less suitable for manual rework or high-vibration environments | Select when board space is constrained and automated assembly is used; verify thermal margin in sealed enclosures. |
| SN74HCT125DR | Texas Instruments part; identical logic function and pinout; wider VCC range (4.5–5.5 V same), but higher ICC max (200 μA at 125 °C) | Same functional replacement; TI's qualification includes AEC-Q100 Grade 2 option for automotive use | Choose for automotive-grade traceability or dual-sourcing; confirm TI's packaging marking and lot traceability requirements. |
Compared with 74HCT125D/AU118, the 74HCT125PW offers smaller footprint but reduced thermal headroom, while SN74HCT125DR provides automotive qualification at the cost of slightly higher quiescent current-both require no schematic change but may impact layout, thermal design, or compliance documentation.
Availability
74HCT125D/AU118 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and automotive diagnostic interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT125D/AU118 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 high-volume, high-reliability logic, analog, and discrete components, serving industrial, automotive, and consumer markets with scalable manufacturing and rigorous quality systems.
The 74HCT125D/AU118 belongs to Nexperia's 74HCT logic family, engineered for seamless interoperability with legacy TTL systems while delivering CMOS power efficiency and robustness in harsh operating environments.
FAQ
What is the maximum supply voltage for the 74HCT125D/AU118?
The absolute maximum supply voltage for the 74HCT125D/AU118 is +7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this range risks violating input/output voltage specifications and may degrade long-term reliability. The 74HCT125D/AU118 must not be operated continuously above 5.5 V, even if below the 7 V absolute limit.
Does the 74HCT125D/AU118 support 3.3 V logic inputs?
No, the 74HCT125D/AU118 does not reliably recognize 3.3 V as a valid HIGH input level. Its TTL-compatible VIH minimum is 2.0 V at VCC = 4.5–5.5 V, but 3.3 V falls below the required 2.0 V threshold only when referenced to its own 5 V supply - however, actual recognition depends on noise margin and source drive strength. For guaranteed 3.3 V compatibility, use 74LVC125 or similar LVCMOS-family devices instead of the 74HCT125D/AU118.
Can the 74HCT125D/AU118 replace a 74LS125 in an existing design?
Yes, the 74HCT125D/AU118 is a functional and pin-compatible replacement for the 74LS125, offering identical pinout, TTL-compatible inputs, and 3-state outputs. It improves upon the LS version with lower power consumption, higher noise immunity, and extended temperature range (-40 °C to +125 °C). No PCB changes are needed, but verify that VCC remains within 4.5–5.5 V and that output loading remains within ±6 mA per 74HCT125D/AU118 output.
What is the disable time (tdis) specification for the 74HCT125D/AU118?
The disable time (tdis) for the 74HCT125D/AU118 is specified as ≤38 ns maximum at VCC = 4.5 V and CL = 50 pF, measured from nOE HIGH-to-LOW transition to output reaching high-impedance state. This parameter ensures fast bus release during multi-master arbitration and is critical for maintaining signal integrity in time-multiplexed bus architectures using the 74HCT125D/AU118.
Is the 74HCT125D/AU118 qualified for automotive applications?
The 74HCT125D/AU118 is not AEC-Q200 qualified and is classified as a general-purpose industrial device. While it operates across -40 °C to +125 °C - a range overlapping automotive under-hood conditions - Nexperia does not certify this specific variant for automotive use. For automotive applications, select the AEC-Q200 qualified 74HCT125-Q100 series or consult Nexperia's automotive portfolio before deploying the 74HCT125D/AU118 in safety-critical or vehicle-integrated systems.
74HCT125D/AU118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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/AU118 FAQ
1.How can I place an order for 74HCT125D/AU118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT125D/AU118 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/AU118 reliable?
The price and inventory of 74HCT125D/AU118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT125D/AU118 is usually 5 days.
3.What payment methods are accepted for 74HCT125D/AU118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT125D/AU118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT125D/AU118?
74HCT125D/AU118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT125D/AU118 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/AU118?
For technical support, including 74HCT125D/AU118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT125D/AU118 requirements.
6.How does Aetrix verify that 74HCT125D/AU118 is sourced from the original manufacturer or authorized distributors?
All 74HCT125D/AU118 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/AU118 meets industry standards.
7.What is the process for return or replacement of 74HCT125D/AU118?
All 74HCT125D/AU118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT125D/AU118, 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/AU118 part is unused and in its original packaging.
Return procedure for 74HCT125D/AU118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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