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Nexperia USA Inc. 74AHCT125D,118
- Part No.:
- 74AHCT125D,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74AHCT125D,118.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,278
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Product details
Overview
74AHCT125D,118 from Nexperia is a quad 3-state buffer/line driver with TTL-compatible inputs and CMOS outputs, operating from 4.5 V to 5.5 V supply. It features four independent channels, each with active-low output enable (nOE), overvoltage-tolerant inputs up to 5.5 V, and propagation delay as low as 3.0 ns at 5 V/15 pF. It is used in bidirectional bus interfacing, level translation between 3.3 V and 5 V domains, and address/data line driving in industrial microcontroller systems.
For engineers reviewing the 74AHCT125D,118 datasheet, 74AHCT125D,118 pinout, 74AHCT125D,118 application, or 74AHCT125D,118 equivalent, this device is selected for mixed-voltage logic buffering where precise timing control, low static current (<2 μA at 25 °C), and robust 3-state isolation are required - especially in legacy 5 V systems integrating modern peripherals.
Technical Context
The 74AHCT125D,118 implements four identical non-inverting buffers, each with separate active-low output enable (nOE) controlling high-impedance state entry/exit. Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure compatibility with standard 5 V logic families while delivering CMOS-level output drive (±8 mA at VCC = 4.5 V).
It uses standard CMOS silicon process with Schmitt-trigger action on all inputs, enabling noise immunity in electrically noisy environments. The device supports full rail-to-rail output swing (VOH ≥ 3.94 V, VOL ≤ 0.36 V at IO = ±8 mA) and operates across –40 °C to +125 °C, validated per JESD78 Class II latch-up and JS-001 HBM ESD (2000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures reliable operation in standard 5 V systems with ±10 % tolerance. |
| Propagation Delay (tpd) | 3.0 ns (typ) at VCC = 5 V, CL = 15 pF - Enables high-speed data routing in synchronous bus architectures. |
| Output Drive | ±8 mA at VCC = 4.5 V - Sufficient to drive 50 Ω transmission lines or multiple 74-series inputs without fanout limitation. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Matches TTL logic levels for seamless integration with legacy controllers and peripherals. |
| Operating Temperature | –40 °C to +125 °C - Qualified for under-hood automotive modules and industrial motor drives requiring extended thermal range. |
| Quiescent Current | 2.0 μA (typ) at VCC = 5.5 V - Minimizes standby power in always-on subsystems such as sensor hubs or watchdog interfaces. |
| ESD Rating | HBM: >2000 V - Provides robust handling during PCB assembly and field service without additional protection circuitry. |
Pinout & Package
74AHCT125D,118 is housed in a 14-lead SO14 (SOT108-1) plastic small outline package, 3.9 mm body width, with gull-wing leads and pin 1 index marker. Thermal resistance (Rth(j-a)) is 105 K/W, supporting continuous operation at ambient up to +125 °C with minimal derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 (1OE–4OE) | Active-low output enable | Each controls one buffer's output state: LOW enables drive, HIGH forces high-impedance - enabling time-multiplexed bus sharing. |
| 2, 5, 9, 12 (1A–4A) | Data input | TTL-compatible inputs tolerate 0–5.5 V; Schmitt-trigger action rejects <1.2 V noise spikes on control/data lines. |
| 3, 6, 8, 11 (1Y–4Y) | Buffered output | CMOS push-pull outputs deliver rail-aligned logic levels with matched rise/fall times (Δt < 0.5 ns typical). |
| 7 | GND | Reference ground for all I/O and internal logic - must be connected directly to system ground plane for signal integrity. |
| 14 | VCC | Primary power supply - decoupling capacitor (100 nF X7R) required within 5 mm of this pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Accepts up to 5.5 V regardless of VCC - allows safe interfacing with higher-voltage signals in mixed-supply systems. |
| 3-state output control | Independent nOE pins per channel eliminate bus contention in multi-master configurations without external logic. |
| Wide temperature range | Specified from –40 °C to +125 °C - eliminates need for derating calculations in harsh-environment applications. |
| Low dynamic power | CPD = 12 pF - enables predictable dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal budgeting. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level A - prevents destructive latch-up during transient overvoltage events. |
Applications
| Industrial PLC Backplane | Legacy Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating and extending address/data buses between CPU module and I/O expansion cards in modular automation racks. IC Role / Device Role / Timing Role: Quad buffer provides channelized 3-state control for bidirectional data lanes, enabling hot-swap-safe bus arbitration. Use Value: Prevents signal contention during card insertion/removal and ensures clean edge transitions at 20 MHz bus clock rates. |
Use Scenario: Interfacing a 5 V 8051-based controller with 3.3 V SPI peripherals via shared address/data multiplexing. IC Role / Device Role / Timing Role: Level-translating buffer with TTL input thresholds accepts 5 V control signals while driving 3.3 V loads with rail-aligned outputs. Use Value: Eliminates need for discrete resistor-divider networks or dedicated level shifters, reducing BOM count and layout area. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
Use Scenario: Driving LED driver enable lines and sensor status indicators in under-dash BCM units exposed to engine bay thermal cycling. IC Role / Device Role / Timing Role: Output-enable-controlled buffer isolates MCU GPIOs from high-current loads, reducing leakage-induced false triggers. Use Value: Guaranteed operation at +125 °C ambient and 2000 V HBM ESD rating reduce field failure risk in unshielded harness environments. |
Use Scenario: Conditioning digital trigger and clock signals in automated test equipment where signal integrity and timing repeatability are critical. IC Role / Device Role / Timing Role: Low-skew, matched-delay buffer retimes and amplifies logic signals before distribution to multiple DUT sites. Use Value: 3.0 ns propagation delay variation <0.3 ns across channels ensures sub-nanosecond inter-channel skew for synchronized stimulus delivery. |
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 |
|---|---|---|---|
| 74AHC125D,118 | CMOS-input version; VIH = 3.85 V min at VCC = 5.5 V | Requires ≥3.85 V input to guarantee HIGH recognition - unsuitable for direct TTL source interfacing | Select when interfacing with 3.3 V or 5 V CMOS sources only; not for legacy TTL. |
| SN74LVC125APWR | 3.3 V only (1.65–3.6 V); lower VCC range; 3.3 V logic levels | Cannot operate at 5 V; lacks overvoltage tolerance - requires external clamping for 5 V signal exposure | Choose for cost-sensitive 3.3 V-only systems where voltage translation is handled elsewhere. |
Compared with 74AHC125D,118 and SN74LVC125APWR, the 74AHCT125D,118 uniquely bridges 5 V TTL and CMOS domains without level-shifting components, offers guaranteed 5 V operation, and maintains full 3-state control across its extended temperature range - making it the only drop-in solution for legacy 5 V industrial designs requiring robustness and interoperability.
Availability
74AHCT125D,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, legacy microcontroller bus expansion, and test equipment signal conditioning requiring stable component supply across extended temperature and long production lifecycles.
Supply support for 74AHCT125D,118 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 optimized for reliability and energy efficiency in industrial and automotive applications.
The 74AHCT series is designed specifically for TTL-to-CMOS interfacing in 5 V systems, emphasizing noise immunity, wide temperature operation, and robustness against voltage transients - targeting industrial control, instrumentation, and legacy upgrade paths.
FAQ
What is the maximum clock frequency supported by 74AHCT125D,118?
The device does not specify a maximum clock frequency, but its propagation delay (3.0 ns typ at 5 V/15 pF) and disable time (6.5 ns typ) support reliable operation in digital systems with data rates up to 100 MHz for single-edge signaling. System-level timing must account for board trace delays and load capacitance, which can extend effective cycle time.
Can 74AHCT125D,118 be used with a 3.3 V supply?
No - the 74AHCT125D,118 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH = 2.0 V min) may not be met reliably, and output drive strength degrades significantly. For 3.3 V systems, use the pin-compatible 74LVC125 or 74AHC125 variants instead.
Is the SO14 package RoHS compliant and lead-free?
Yes - the 74AHCT125D,118 in SOT108-1 (SO14) package is fully RoHS compliant and lead-free, meeting EU Directive 2011/65/EU and JEDEC J-STD-609 Category 3 marking requirements. The finish is matte tin, with no lead content in die attach, bond wires, or termination plating.
How does the overvoltage tolerance work on the inputs?
Inputs tolerate up to 5.5 V regardless of VCC due to integrated diode clamps to VCC and GND. When an input exceeds VCC by >0.5 V, the clamp diode conducts, limiting voltage to ~VCC + 0.7 V. This allows safe connection to 5 V signals even when VCC = 4.5 V, provided input current remains below ±20 mA per pin.
74AHCT125D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
74AHCT125D,118 FAQ
1.How can I place an order for 74AHCT125D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT125D,118 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 74AHCT125D,118 reliable?
The price and inventory of 74AHCT125D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT125D,118 is usually 5 days.
3.What payment methods are accepted for 74AHCT125D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT125D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT125D,118?
74AHCT125D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT125D,118 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 74AHCT125D,118?
For technical support, including 74AHCT125D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT125D,118 requirements.
6.How does Aetrix verify that 74AHCT125D,118 is sourced from the original manufacturer or authorized distributors?
All 74AHCT125D,118 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 74AHCT125D,118 meets industry standards.
7.What is the process for return or replacement of 74AHCT125D,118?
All 74AHCT125D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT125D,118, 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 74AHCT125D,118 part is unused and in its original packaging.
Return procedure for 74AHCT125D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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