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STMicroelectronics 74LCX125YMTR
- Part No.:
- 74LCX125YMTR
- Manufacturer:
- STMicroelectronics
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74LCX125YMTR.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:6,787
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Product details
Overview
74LCX125YMTR from STMicroelectronics is a low-voltage CMOS quad 3-state bus buffer with 5 V tolerant inputs/outputs, operating from 2.0 V to 3.6 V supply, delivering 5.2 ns max propagation delay at 3 V and ±24 mA output drive. It serves as a level-translating bidirectional interface in automotive infotainment backplanes and industrial I/O expansion modules.
For engineers reviewing the 74LCX125YMTR datasheet, 74LCX125YMTR pinout, 74LCX125YMTR application, or 74LCX125YMTR equivalent, this device is selected for 3.3 V logic systems requiring robust 5 V signal interoperability, high-speed bus isolation, and AEC-Q100 qualified reliability in harsh environments.
Technical Context
The 74LCX125YMTR implements four independent non-inverting buffers, each controlled by a dedicated active-low 3-state enable input (1G–4G). Its C2MOS sub-micron process enables rail-to-rail 5 V tolerance on all I/O pins while maintaining TTL-compatible thresholds at 3.3 V operation.
Propagation delays are balanced (tPLH ≅ tPHL), and output impedance is symmetrical (|IOH| = IOL ≥ 24 mA at VCC = 3.0–3.6 V), ensuring matched rise/fall times and clean signal integrity across PCI-compliant bus loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 3.6 V - supports core logic voltage scaling while retaining compatibility with legacy 5 V peripherals |
| tPD (max) | 5.2 ns at VCC = 3.0–3.6 V - matches AC/ACT speed at half the power, enabling high-throughput data routing |
| I/O Tolerance | 5 V - allows direct connection to 5 V buses without external level shifters or clamping diodes |
| Output Drive | ±24 mA at VCC ≥ 2.7 V - drives standard 50 Ω transmission lines or multiple TTL loads under worst-case conditions |
| ESD Rating | HBM: 2000 V, MM: 200 V, CDM: 1000 V - exceeds JEDEC standards for handling and board-level robustness |
| Operating Temp | −40 °C to +85 °C - qualified per AEC-Q100 Grade 2 for under-hood and dashboard electronics |
Pinout & Package
74LCX125YMTR is housed in a 14-pin SOIC (SO-14) package with standard 1.27 mm pitch, 8.7 mm × 4.0 mm body, and gull-wing leads suitable for reflow soldering and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1G–4G (OE) | Active-high 3-state enable inputs - assert HIGH to disable corresponding output (Y) into high-impedance state |
| 2, 5, 9, 12 | 1A–4A (IN) | Buffer input terminals - accept 0–5.5 V signals regardless of VCC, enabling mixed-voltage domain interfacing |
| 3, 6, 8, 11 | 1Y–4Y (OUT) | Non-inverting buffered outputs - deliver rail-aligned logic levels with symmetrical sourcing/sinking capability |
| 7 | GND | Ground reference - must be connected to system 0 V plane; decoupling capacitor required near pin |
| 14 | VCC | Positive supply - powers internal logic; requires local 100 nF ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| 5 V tolerant I/O | Enables direct interconnection between 3.3 V logic and legacy 5 V subsystems without external protection or translation circuitry |
| Symmetrical output drive | Ensures matched edge rates and minimal skew across all four channels, critical for synchronous bus timing |
| Power-down protection | Prevents current backflow when VCC = 0 V, allowing safe hot-insertion or partial power-down in modular systems |
| AEC-Q100 qualification | Validated for automotive use including temperature cycling, humidity testing, and ESD stress per Grade 2 requirements |
Applications
| Automotive Infotainment Backplane | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating and buffering CAN/LIN transceiver data paths from MCU GPIO banks in head unit mainboards. IC Role / Device Role / Timing Role: Quad 3-state buffer providing direction-controlled signal routing between 3.3 V microcontroller and 5 V automotive serial buses. Use Value: Eliminates need for discrete level-shifting components while maintaining <5.2 ns propagation delay for real-time protocol response. | Use Scenario: Interfacing FPGA-configured digital I/O modules to legacy 5 V sensor/actuator interfaces in factory automation racks. IC Role / Device Role / Timing Role: Voltage-tolerant bus driver enabling FPGA to control multiple 5 V peripheral devices via shared address/data lines. Use Value: Supports hot-swap-safe 3-state control and delivers ±24 mA drive to meet industrial noise immunity requirements. |
| Computer Peripheral Interface | Consumer Audio DSP Subsystem |
Use Scenario: Buffering USB hub controller status lines and configuration registers to 5 V EEPROM and LED indicators. IC Role / Device Role / Timing Role: Level-translating buffer isolating low-voltage host logic from higher-voltage peripheral signaling domains. Use Value: Maintains signal integrity across mixed-supply boundaries with no additional passive components or timing penalties. | Use Scenario: Driving analog switch control lines and DAC reference selection bits in multi-channel audio processors. IC Role / Device Role / Timing Role: Low-power, high-speed buffer ensuring precise timing alignment between DSP core and external analog front-end ICs. Use Value: Delivers <1 ns output skew and rail-to-rail 5 V tolerance to prevent latch-up during dynamic voltage transitions. |
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 |
|---|---|---|---|
| SN74LVC125APWR | Lower VCC min (1.65 V), slightly slower tPD (6.7 ns), same 5 V tolerance, non-automotive grade | Lacks AEC-Q100 qualification; not rated for −40 °C to +85 °C extended automotive use | Select for cost-sensitive consumer designs where extended temperature and automotive qualification are unnecessary |
| 74ALVC125MTCX | Faster tPD (3.6 ns), lower ICC (1 μA), but only 3.6 V max VCC and no 5 V tolerance on inputs | Requires external level shifters for 5 V interface; unsuitable for mixed-voltage backplane applications | Choose when maximum speed and ultra-low static power dominate over voltage interoperability needs |
Compared with SN74LVC125APWR and 74ALVC125MTCX, the 74LCX125YMTR uniquely combines AEC-Q100 qualification, true 5 V I/O tolerance, and 5.2 ns speed at 3.3 V-making it the only option for automotive-grade mixed-voltage bus isolation without added components.
Availability
74LCX125YMTR is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, and computer peripheral interfaces requiring stable component supply across long production lifecycles.
Supply support for 74LCX125YMTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal products for automotive, industrial, and consumer markets.
The 74LCX series targets low-voltage, high-speed logic interfacing with 5 V tolerance-designed specifically for seamless integration between emerging 3.3 V systems and legacy 5 V infrastructure in automotive and industrial control applications.
FAQ
Is 74LCX125YMTR pin-compatible with standard 74LS125 or 74HC125?
Yes, it is pin- and function-compatible with the 74 series 125 family, including 74LS125 and 74HC125, sharing identical SO-14 pinout and truth table behavior. However, its 5 V tolerant I/O and 2.0–3.6 V VCC range differ from LS (5 V only) and HC (2–6 V), requiring attention to supply voltage and interface voltage levels.
What does "YMTR" suffix indicate in 74LCX125YMTR?
The "YMTR" suffix denotes the automotive-grade SO-14 package variant: "Y" indicates AEC-Q100 qualification, "M" specifies SO-14 packaging, and "TR" means tape-and-reel delivery. This version undergoes enhanced screening per AEC-Q001/Q002 and operates from −40 °C to +85 °C.
Can 74LCX125YMTR drive a 50 Ω transmission line directly?
Yes-it delivers ±24 mA output current at VCC = 3.0–3.6 V, sufficient to drive a 50 Ω load to valid logic levels (VOH ≥ 2.2 V, VOL ≤ 0.55 V) with margin. For optimal signal integrity, use controlled-impedance PCB routing and local VCC/GND decoupling.
Does 74LCX125YMTR require external pull-up or pull-down resistors on unused inputs?
No-inputs have built-in protection diodes and leakage is limited to ±5 μA, but best practice is to tie unused inputs to VCC or GND to prevent floating states that may increase dynamic power or cause unintended switching in noisy environments.
74LCX125YMTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LCX
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
74LCX125YMTR FAQ
1.How can I place an order for 74LCX125YMTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX125YMTR 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 74LCX125YMTR reliable?
The price and inventory of 74LCX125YMTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX125YMTR is usually 5 days.
3.What payment methods are accepted for 74LCX125YMTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX125YMTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX125YMTR?
74LCX125YMTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX125YMTR 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 74LCX125YMTR?
For technical support, including 74LCX125YMTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX125YMTR requirements.
6.How does Aetrix verify that 74LCX125YMTR is sourced from the original manufacturer or authorized distributors?
All 74LCX125YMTR 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 74LCX125YMTR meets industry standards.
7.What is the process for return or replacement of 74LCX125YMTR?
All 74LCX125YMTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX125YMTR, 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 74LCX125YMTR part is unused and in its original packaging.
Return procedure for 74LCX125YMTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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