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STMicroelectronics 74LVC125ATTR
- Part No.:
- 74LVC125ATTR
- Manufacturer:
- STMicroelectronics
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVC125ATTR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,519
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Product details
Overview
74LVC125ATTR from STMicroelectronics is a quad 3-state bus buffer IC with 1.65–3.6 V operation, 5V-tolerant inputs, 4.8 ns max propagation delay at 3V, ±24 mA output drive, and TSSOP-14 package. It serves as a level-shifting, bidirectional bus interface in mixed-voltage systems (e.g., 3.3V logic driving 5V peripherals).
For engineers reviewing the 74LVC125ATTR datasheet, 74LVC125ATTR pinout, 74LVC125ATTR application, or 74LVC125ATTR equivalent, key selection criteria include 3-state control timing (tPZL/tPLZ), symmetric drive strength, latch-up immunity (>500 mA), ESD robustness (HBM >2 kV), and compatibility with legacy 74-series logic footprints.
Technical Context
This device implements four independent non-inverting buffers, each controlled by a dedicated active-low 3-state enable input (G1–G4). All outputs enter high-impedance state when corresponding G is HIGH, enabling shared-bus arbitration without external pull-ups or direction control logic.
It uses sub-micron C2MOS technology for low dynamic power (CPD = 34 pF at 3.3V) and operates across industrial temperature range (−55°C to +125°C). Input thresholds are voltage-ratio-based (VIH = 0.65×VCC, VIL = 0.35×VCC), ensuring noise margin stability across supply variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports single-supply operation in modern low-voltage embedded systems |
| tPD (max) | 4.8 ns at VCC = 3.0–3.6 V - enables reliable 200+ MHz bus toggling with margin |
| IOL / IOH | ±24 mA at VCC ≥ 2.7 V - drives standard TTL loads and multiple CMOS inputs without buffering |
| Input Voltage | 0–5.5 V - allows direct connection to 5V signals without external level shifters |
| ESD HBM | >2000 V - meets MIL-STD-883 Class 3A for board-level handling robustness |
| Latch-up | >500 mA per JESD17 - prevents destructive current runaway during overvoltage transients |
| Operating Temp | −55°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
TSSOP-14 package: 4.9 mm × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | G1–G4 (Active-High Enable) | Assert HIGH to disable output (Z-state); LOW enables buffer pass-through |
| 2, 5, 10, 13 | A1–A4 (Data Inputs) | 5V-tolerant CMOS inputs; accept 0–5.5 V regardless of VCC |
| 3, 6, 8, 11 | Y1–Y4 (Data Outputs) | CMOS outputs with symmetrical sourcing/sinking; support hot-swap bus insertion |
| 7 | GND | Reference ground for all I/O and internal logic; must be low-impedance |
| 14 | VCC | Primary supply rail; powers internal logic and output drivers; decoupling required |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant inputs | Enables seamless interfacing between 3.3V LVC logic and legacy 5V subsystems without external translators |
| Power-down protection | Prevents back-driving and leakage when VCC = 0 V - critical for partial-power-down system modes |
| Balanced tPLH/tPHL | Minimizes duty-cycle distortion on clock or data buses where edge symmetry affects setup/hold timing |
| PCI bus level compliance | Guaranteed ±24 mA drive at 3.3 V satisfies PCI Local Bus Specification Rev. 2.2 DC requirements |
| Low ICC quiescent current | ≤10 µA at VCC = 3.6 V - reduces static power in always-on monitoring or standby circuits |
Applications
| Industrial PLC Backplane Interface | Automotive Infotainment Data Mux |
|---|---|
Use Scenario: Isolating and routing sensor data between 3.3V microcontroller and 5V analog front-end modules on a modular I/O carrier board. IC Role / Device Role / Timing Role: Bidirectional bus buffer with 3-state control enabling time-multiplexed access to shared ADC/DAC resources. Use Value: Eliminates need for discrete level shifters and reduces BOM count while maintaining signal integrity up to 100 MHz. |
Use Scenario: Multiplexing audio codec control lines (I²C, SPI) between head unit MCU and multiple display/audio processors in a multi-zone infotainment system. IC Role / Device Role / Timing Role: Logic-level translator and bus isolator supporting hot-plug detection and dynamic reconfiguration. Use Value: Enables 5V-tolerant I/O handshaking without violating automotive EMC limits due to low-noise C2MOS design. |
| Embedded Test Equipment Signal Conditioning | Network Switch Management Interface |
Use Scenario: Driving test pattern generators and capturing responses from DUTs operating at mixed 1.8V/3.3V/5V logic levels in automated test fixtures. IC Role / Device Role / Timing Role: Programmable bus driver with precise enable/disable timing (tPZH ≤ 6.5 ns) for synchronized stimulus application. Use Value: Reduces test cycle time via fast output enable/disable and eliminates false triggering from slow slew rates. |
Use Scenario: Interfacing management MCU GPIOs to PHY status LEDs, reset lines, and MDIO bus segments in Gigabit Ethernet switch designs. IC Role / Device Role / Timing Role: Level-translating buffer for open-drain and push-pull control signals with guaranteed 24 mA sink capability. Use Value: Ensures reliable LED brightness control and PHY reset assertion even under worst-case VCC droop conditions. |
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 (TI) | Identical electrical specs; slightly higher CPD (36 pF vs. 34 pF); same TSSOP-14 footprint | No functional difference; validated for identical industrial temp range and ESD ratings | Select when TI supply chain alignment or dual-sourcing strategy requires second-source qualification |
| 74ALVC125TTR (STMicroelectronics) | Faster tPD (3.4 ns typ. at 3.3 V); higher ICC (20 µA quiescent); same pinout and voltage range | Better suited for high-speed clock distribution or timing-critical data paths where <4 ns delay is mandatory | Choose only if propagation delay reduction justifies ~2× higher static power and tighter layout constraints |
Compared with SN74LVC125APWR, 74LVC125ATTR offers identical functionality with marginally lower dynamic power; versus 74ALVC125TTR, it trades 1.4 ns speed for half the quiescent current-making it optimal for battery-backed or thermally constrained applications.
Availability
74LVC125ATTR is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive infotainment subsystems, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVC125ATTR 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, specializing in microcontrollers, power management, analog, and automotive-grade ICs with vertical manufacturing capabilities.
The 74LVC series targets low-voltage, high-speed digital logic applications in portable, industrial, and automotive systems where power efficiency, noise immunity, and mixed-voltage interoperability are essential.
FAQ
Can 74LVC125ATTR operate with VCC = 1.8 V and still drive 5V-tolerant loads?
Yes. At VCC = 1.8 V, the device maintains full 5V input tolerance (VI = 0–5.5 V) and guarantees VIH = 1.17 V and VIL = 0.63 V. Output swing remains rail-to-rail (0–1.8 V), so external level translation is required for driving 5V logic inputs-but input-side 5V signal reception works natively.
What is the maximum capacitive load this device can drive reliably at 100 MHz?
Based on CL = 50 pF test condition and tPD = 4.8 ns max at 3.3 V, the device supports ≤50 pF load capacitance at frequencies up to 200 MHz. For 100 MHz operation, ensure PCB trace capacitance plus receiver input capacitance stays below 45 pF to maintain timing margin and signal integrity.
Does the 74LVC125ATTR require external pull-up resistors on its 3-state enable inputs?
No. The G1–G4 inputs have CMOS-compatible thresholds and no internal pull-ups. However, in systems where enable states must be defined during power-up or reset, external 10–100 kΩ pull-down resistors are recommended to guarantee known initial Z-state and prevent floating inputs.
How does the power-down protection feature behave when VCC is disconnected?
When VCC = 0 V, all inputs and outputs are protected against back-current flow: input diodes clamp to GND, and output drivers remain in high-impedance state with Ioff ≤ 10 µA at VO = 5.5 V-enabling safe hot-insertion into live backplanes or partial-power-down system architectures.
74LVC125ATTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LVC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
74LVC125ATTR FAQ
1.How can I place an order for 74LVC125ATTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC125ATTR 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 74LVC125ATTR reliable?
The price and inventory of 74LVC125ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC125ATTR is usually 5 days.
3.What payment methods are accepted for 74LVC125ATTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC125ATTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVC125ATTR?
74LVC125ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC125ATTR 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 74LVC125ATTR?
For technical support, including 74LVC125ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC125ATTR requirements.
6.How does Aetrix verify that 74LVC125ATTR is sourced from the original manufacturer or authorized distributors?
All 74LVC125ATTR 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 74LVC125ATTR meets industry standards.
7.What is the process for return or replacement of 74LVC125ATTR?
All 74LVC125ATTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC125ATTR, 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 74LVC125ATTR part is unused and in its original packaging.
Return procedure for 74LVC125ATTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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