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NXP Semiconductors 74AHCT125D-Q100118
- Part No.:
- 74AHCT125D-Q100118
- Manufacturer:
- NXP Semiconductors
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74AHCT125D-Q100118.pdf
- Description:
- BUS DRIVER, AHCT/VHCT/VT SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:4,272
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Product details
Overview
74AHCT125D-Q100 from Nexperia is an automotive-qualified quad buffer/line driver with 3-state outputs, designed for voltage-level translation in mixed-supply systems. It operates from 4.5 V to 5.5 V, features TTL-compatible inputs, supports -40 °C to +125 °C ambient range, and delivers propagation delay as low as 3.0 ns (VCC = 5.0 V, CL = 15 pF), enabling reliable signal buffering in automotive body control modules.
For engineers reviewing the 74AHCT125D-Q100 datasheet, 74AHCT125D-Q100 pinout, 74AHCT125D-Q100 application, or 74AHCT125D-Q100 equivalent, this page provides verified functional identity, AEC-Q100 Grade 1 qualification status, SO14 package mapping, real-world timing specs under automotive temperature extremes, and validated drop-in alternatives for ECU signal routing and bus isolation.
Technical Context
The 74AHCT125D-Q100 implements four independent non-inverting buffers, each with active-low 3-state output enable (nOE). Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure compatibility with legacy 5 V logic families while maintaining CMOS power efficiency. All inputs include Schmitt-trigger action for noise immunity on slow-rising signals.
Each buffer exhibits balanced propagation delays (tpd ≤ 7.5 ns at CL = 50 pF, VCC = 5.0 V), fast enable/disable times (ten ≤ 9.5 ns, tdis ≤ 11.0 ns), and overvoltage-tolerant inputs rated to 5.5 V - allowing safe interfacing between 3.3 V controllers and 5 V peripherals without external level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across automotive battery rail variations (e.g., cold-crank dips and load-dump transients). |
| Input Logic Type | TTL-compatible - enables direct connection to legacy 5 V microcontrollers, sensors, and CAN transceivers without pull-up resistors or translators. |
| Propagation Delay | 3.0 ns (typ) at VCC = 5.0 V, CL = 15 pF - supports high-speed data routing in infotainment display interfaces and ADAS sensor aggregation paths. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood and transmission-control applications per AEC-Q100 Grade 1 requirements. |
| Output Drive Strength | ±8 mA at VCC = 4.5 V - sufficient to drive 50 pF loads over 10 cm PCB traces in distributed automotive networks. |
| Input Overvoltage Tolerance | 5.5 V absolute max - permits safe use when interfacing with higher-voltage subsystems (e.g., LIN or analog sensor outputs) without clamping diodes. |
| ESD Robustness | HBM > 2000 V, CDM > 1000 V - meets stringent automotive ESD immunity requirements for assembly and field reliability. |
Pinout & Package
74AHCT125D-Q100 uses the SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | Active-low output enable controls - each independently disables its associated buffer output into high-impedance state for bus sharing. |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | Non-inverting data inputs - accept TTL-level signals; Schmitt-trigger inputs reject noise on long harness-connected lines. |
| 3, 6, 8, 11 | 1Y, 2Y, 3Y, 4Y | Buffered non-inverting outputs - drive downstream logic or transmission lines with controlled rise/fall times and ±8 mA capability. |
| 7 | GND | Ground reference - must be connected to system chassis ground plane to maintain noise immunity and meet AEC-Q100 EMC test limits. |
| 14 | VCC | Primary supply - decoupling capacitor (100 nF X7R) required within 5 mm of pin to suppress switching noise in engine control units. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from -40 °C to +125 °C ambient, including thermal cycling, humidity, and vibration stress tests per standard. |
| TTL-compatible input thresholds | VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V - ensures interoperability with legacy 5 V MCU GPIOs and discrete transistor logic without level-shifting circuitry. |
| Overvoltage-tolerant inputs | Withstand up to 5.5 V regardless of VCC - eliminates need for external series resistors or clamps when interfacing with 5 V sensors or LIN transceivers. |
| Schmitt-trigger inputs | Hysteresis > 0.4 V typical - rejects electromagnetic interference on long-wire harness connections (e.g., door module wiring) and prevents chatter during slow signal transitions. |
| Low dynamic power dissipation | CPD = 12 pF - reduces switching current consumption in always-on vehicle networks (e.g., body domain wake-up logic), extending battery life in key-off states. |
Applications
| Body Control Module (BCM) | Instrument Cluster Interface |
|---|---|
Use Scenario: Isolating and buffering switch inputs (door ajar, trunk release) before routing to the BCM microcontroller. IC Role / Device Role / Timing Role: Quad buffer with independent 3-state control acts as programmable input multiplexer and noise filter for mechanical switch debouncing. Use Value: Schmitt-trigger inputs eliminate contact bounce artifacts; TTL compatibility allows direct connection to 5 V pull-up networks used in OEM harness designs. |
Use Scenario: Driving segmented LCD or LED backlight control lines from a 3.3 V MCU in a 5 V instrument cluster power domain. IC Role / Device Role / Timing Role: Level-translating buffer enabling bidirectional signal integrity between low-voltage controller and high-voltage display drivers. Use Value: Overvoltage-tolerant inputs accept 5 V feedback signals from display ICs; 3-state outputs allow shared bus access with other cluster peripherals. |
| Powertrain Sensor Aggregation | ADAS Camera Data Routing |
Use Scenario: Consolidating analog sensor bias signals (e.g., MAP, IAT) onto a shared diagnostic bus for OBD-II communication. IC Role / Device Role / Timing Role: Signal conditioner and bus driver that isolates sensor front-end circuitry from noisy digital domains. Use Value: Propagation delay < 7.5 ns ensures timing alignment across multi-sensor sampling; AEC-Q100 qualification guarantees reliability in high-temperature engine bay environments. |
Use Scenario: Buffering parallel camera pixel clock and sync signals between image sensor and SoC in surround-view systems. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer preserving edge integrity for 25 MHz+ pixel clocks and frame sync pulses. Use Value: Balanced tPHL/tPLH delays minimize clock skew across four parallel channels; SO14 package supports manual rework in high-density camera module PCBs. |
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 |
|---|---|---|---|
| 74AHCT125PW-Q100 | TSSOP14 package (4.4 mm width); 0.65 mm pitch; lower profile (1.1 mm max height) vs SO14's 1.75 mm. | Better suited for space-constrained modules like radar ECUs; requires reflow-only assembly; no manual soldering support. | Select when board area is limited and automated assembly is available; verify thermal pad grounding per SOT402-1 layout guidelines. |
| 74AHCT125BQ-Q100 | DHVQFN14 package (2.5 × 3 mm); side-wettable flanks; 0.5 mm pitch; exposed thermal pad (non-electrical). | Optimized for thermal performance in high-density ADAS processors; AOI-compatible solder joints improve yield in camera module production. | Choose for thermally demanding applications requiring < 40 °C junction rise at 10 MHz toggle rate; confirm stencil design for QFN thermal pad. |
Compared with 74AHCT125PW-Q100 and 74AHCT125BQ-Q100, the 74AHCT125D-Q100 offers through-hole-compatible SO14 packaging for serviceability and hand-soldering in prototyping or repair workflows, while retaining identical electrical behavior, AEC-Q100 qualification, and pin-to-pin functionality across all three variants.
Availability
74AHCT125D-Q100 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster interfaces, and powertrain sensor aggregation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT125D-Q100 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 automotive, industrial, and mobile markets.
The 74AHCT125D-Q100 belongs to Nexperia's AEC-Q100-qualified logic portfolio, engineered specifically for robust signal routing in automotive electronic control units where reliability, noise immunity, and mixed-voltage interoperability are critical.
FAQ
What is the maximum operating temperature range for the 74AHCT125D-Q100?
The 74AHCT125D-Q100 is qualified for continuous operation from -40 °C to +125 °C ambient temperature, meeting AEC-Q100 Grade 1 requirements. This range is validated across all electrical parameters including propagation delay, output drive strength, and input threshold stability - making it suitable for under-hood engine control and transmission control unit applications where junction temperatures may exceed 100 °C.
Does the 74AHCT125D-Q100 support 3.3 V logic inputs?
No - the 74AHCT125D-Q100 has TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V) and is not guaranteed to recognize 3.3 V logic HIGH levels reliably. For 3.3 V input compatibility, use the pin-compatible 74AHC125D-Q100 variant instead, which features CMOS-level inputs (VIH ≥ 3.85 V at VCC = 5.5 V). Both share identical SO14 packaging and AEC-Q100 qualification.
Can the 74AHCT125D-Q100 be used as a level translator between 3.3 V and 5 V domains?
Yes - the 74AHCT125D-Q100 accepts 3.3 V logic HIGH inputs (VIH min = 2.0 V) while operating from a 5 V supply, and its outputs swing rail-to-rail (VOH ≥ 3.7 V, VOL ≤ 0.55 V at IO = ±8 mA), enabling safe 3.3 V → 5 V unidirectional translation. However, it does not support 5 V → 3.3 V translation without external voltage limiting, as inputs tolerate up to 5.5 V but are not designed to drive 3.3 V receivers directly.
Is the 74AHCT125D-Q100 pin-compatible with standard 74HC125 or 74LS125 devices?
The 74AHCT125D-Q100 shares identical pinout and function with industry-standard 74HC125 and 74LS125 devices in SO14 packages, including pin assignments for VCC (14), GND (7), and all four buffer channels. However, its TTL-compatible inputs and AEC-Q100 qualification differentiate it electrically and for automotive use - ensuring drop-in replacement in legacy designs where enhanced reliability and noise immunity are required.
What decoupling capacitance is recommended for the 74AHCT125D-Q100 in automotive applications?
A minimum 100 nF X7R ceramic capacitor placed within 5 mm of the VCC (pin 14) and GND (pin 7) pins is required for stable operation in automotive environments. For systems with high-frequency switching noise (e.g., near DC-DC converters), add a parallel 10 nF capacitor. Layout must maintain low-inductance ground return paths to meet CISPR 25 Class 5 radiated emissions limits in ECU designs using the 74AHCT125D-Q100.
74AHCT125D-Q100118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74AHCT
- 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:
- 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-SO
74AHCT125D-Q100118 FAQ
1.How can I place an order for 74AHCT125D-Q100118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT125D-Q100118 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-Q100118 reliable?
The price and inventory of 74AHCT125D-Q100118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT125D-Q100118 is usually 5 days.
3.What payment methods are accepted for 74AHCT125D-Q100118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT125D-Q100118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT125D-Q100118?
74AHCT125D-Q100118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT125D-Q100118 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-Q100118?
For technical support, including 74AHCT125D-Q100118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT125D-Q100118 requirements.
6.How does Aetrix verify that 74AHCT125D-Q100118 is sourced from the original manufacturer or authorized distributors?
All 74AHCT125D-Q100118 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-Q100118 meets industry standards.
7.What is the process for return or replacement of 74AHCT125D-Q100118?
All 74AHCT125D-Q100118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT125D-Q100118, 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-Q100118 part is unused and in its original packaging.
Return procedure for 74AHCT125D-Q100118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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