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Texas Instruments SN74LVC125AD
- Part No.:
- SN74LVC125AD
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC125AD.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,784
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Product details
Overview
SN74LVC125AD from Texas Instruments is a quadruple 3-state bus buffer gate designed for level translation and bus isolation in mixed-voltage systems. It operates from 1.65V to 3.6V, supports 5.5V-tolerant inputs, delivers ≤4.8ns propagation delay at 3.3V, and is rated for –40°C to 125°C operation - enabling use in telecom baseband units and optical networking line cards.
For engineers reviewing the SN74LVC125AD datasheet, SN74LVC125AD pinout, SN74LVC125AD application, or SN74LVC125AD equivalent, key selection criteria include its independent OE control per channel, 3.6V max VCC, 5.5V input tolerance, 24mA output drive capability at 3V, and SOIC-14 package compatibility with legacy board layouts.
Technical Context
The SN74LVC125AD implements four independent noninverting buffers, each with dedicated output-enable (OE) logic that places the Y output in high-impedance when OE = HIGH. Its CMOS design enables bidirectional voltage translation: 3.3V outputs can interface with 5V logic inputs while accepting 5.5V signals on A inputs without damage.
Each channel functions as a controlled pass-through gate: when OE is LOW, A drives Y with rail-to-rail swing; when OE is HIGH, Y enters high-Z state regardless of A. The device requires no external biasing beyond standard VCC/GND and pull-up on OE for power-up safety - eliminating need for sequenced supply control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - supports single-supply operation across LVC-family voltage domains including 1.8V, 2.5V, and 3.3V systems. |
| Input Voltage Tolerance | Up to 5.5V - allows direct connection to 5V logic without level-shifting circuitry, simplifying mixed-voltage interconnects. |
| Max Propagation Delay | 4.8ns at VCC = 3.3V - enables reliable operation in high-speed digital buses up to ~100MHz clock-equivalent rates. |
| Output Drive Strength | ±24mA at VCC = 3V - sufficient to drive moderate capacitive loads (e.g., 10–15pF) and multiple CMOS inputs without buffering. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature telecom infrastructure applications including RRUs and PDUs. |
| ESD Rating | ±2000V HBM - meets standard handling requirements for automated assembly and field-replaceable modules. |
Pinout & Package
SN74LVC125AD uses the SOIC-14 (D) package: 8.6mm × 6.0mm body, 14-pin gull-wing leadframe, RoHS-compliant NiPdAu finish, MSL Level-1, and tube packaging (50 pcs).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-Low Output Enable Input | Independent control per buffer; HIGH forces corresponding Y into high-impedance, enabling bus sharing and contention avoidance. |
| 1A–4A | Buffer Input | Noninverting data input for each channel; accepts 0–5.5V regardless of VCC, enabling 5V→3.3V translation. |
| 1Y–4Y | Buffer Output | CMOS-compatible output with rail-to-rail swing; sinks or sources up to 24mA at 3V, compatible with LVTTL and LVCMOS loads. |
| VCC (Pin 14) | Positive Supply | Single power rail for all logic and I/O; must be bypassed with 0.1µF capacitor near pin to suppress switching noise. |
| GND (Pin 7) | Ground Reference | Common return path for all channels; requires low-inductance connection to system ground plane for signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-State Control | Four separate OE inputs allow selective disabling of individual buffers - critical for dynamic bus arbitration in multi-master systems. |
| 5.5V-Tolerant Inputs | Eliminates external clamping diodes or resistive dividers when interfacing with legacy 5V peripherals or microcontrollers. |
| Low Propagation Delay | 4.8ns max at 3.3V enables timing-critical applications such as high-speed serial link sideband control or FPGA configuration bus extension. |
| Wide Temperature Range | –40°C to +125°C rating ensures stable performance in outdoor telecom shelters, remote radio units, and power distribution units. |
| High Noise Immunity | Input hysteresis and robust VIH/VIL thresholds (e.g., VIH = 2.0V min at VCC = 3.0V) prevent false triggering in electrically noisy environments. |
Applications
| Telecom Baseband Units | Optical Networking Line Cards |
|---|---|
Use Scenario: Isolating FPGA I/O banks from backplane data buses in LTE/5G baseband processing units. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-channel 3-state control, enabling time-multiplexed access to shared memory or ADC/DAC interfaces. Use Value: Prevents bus contention during FPGA reconfiguration; 5.5V-tolerant inputs accept legacy control signals without level shifters. |
Use Scenario: Driving parallel status/control lines between EPON OLT controller and optical transceiver modules. IC Role / Device Role / Timing Role: Noninverting voltage translator and load driver, translating 3.3V FPGA GPIO to 5V-compatible transceiver enable/reset signals. Use Value: Eliminates discrete resistor networks; 24mA drive strength ensures fast edge rates across 10cm PCB traces to SFP+ cages. |
| Remote Radio Units (RRU) | Power Distribution Units (PDU) |
Use Scenario: Managing GPIO expansion for RF front-end calibration and antenna tuning in compact RRUs. IC Role / Device Role / Timing Role: Low-latency buffer for SPI- or parallel-controlled DACs and RF switches, with independent OE for power-gated subsystems. Use Value: Enables rapid shutdown of RF chains during sleep mode via OE assertion - reducing standby current without firmware overhead. |
Use Scenario: Interfacing MCU GPIOs to isolated relay drivers and analog monitoring circuits in AC/DC power distribution panels. IC Role / Device Role / Timing Role: Signal conditioner and level translator between 3.3V microcontroller and 5V analog front-end ICs or optocoupled feedback paths. Use Value: Simplifies BOM by replacing dual-supply translators; 125°C rating ensures reliability near heat-generating DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APW | TSSOP-14 package (5.0mm × 6.4mm), same electrical specs, identical pinout but smaller footprint and finer pitch. | Better suited for space-constrained designs like small-form-factor optical modules or dense RRU PCBs. | Select SN74LVC125APW when board area is limited and reflow capability supports 0.65mm pitch; SN74LVC125AD remains optimal for through-hole prototyping or legacy SOIC layouts. |
| 74LVC125ABQAR | WQFN-14 (3mm × 2.5mm) package with thermal pad, same functionality, 100% pin-compatible but different land pattern and soldering profile. | Preferred for thermally demanding telecom applications requiring lower junction-to-ambient resistance (RθJA = 102.3°C/W vs. 127.8°C/W for SOIC). | Choose 74LVC125ABQAR for high-power-density deployments where thermal management is critical; SN74LVC125AD offers easier inspection and rework in production test environments. |
Compared with SN74LVC125APW and 74LVC125ABQAR, the SN74LVC125AD provides the most accessible mechanical integration for existing SOIC footprints, highest manufacturability in mixed-technology assemblies, and broadest distributor availability - making it the default choice for volume telecom infrastructure designs where layout flexibility and supply chain resilience are prioritized over minimal size or thermal optimization.
Availability
SN74LVC125AD is available at Aetrix Electronics and suitable for telecom baseband units, optical networking line cards, and remote radio units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74LVC125AD 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The SN74LVC125AD belongs to TI's LVC logic family, engineered for low-voltage, high-speed interoperability in mixed-signal infrastructure equipment - particularly targeting telecom, networking, and industrial control systems demanding robust voltage translation and bus isolation.
FAQ
What is the maximum input voltage the SN74LVC125AD can tolerate?
The SN74LVC125AD supports input voltages up to 5.5V regardless of VCC level - a key feature enabling direct interfacing with 5V logic in mixed-voltage systems. This tolerance applies to all A inputs (pins 2, 5, 9, 12) and OE inputs (pins 1, 4, 10, 13), verified per TI's absolute maximum ratings table. Operation at 5.5V does not require external clamping or current limiting.
Does the SN74LVC125AD support 1.8V operation?
Yes, the SN74LVC125AD is fully specified down to 1.65V VCC, making it compatible with 1.8V systems. At 1.8V, it delivers typical propagation delay of 11.8ns and maintains valid VIH/VIL thresholds (VIH = 0.65×VCC ≈ 1.17V). All electrical characteristics - including output drive and 3-state leakage - are guaranteed across the full 1.65V–3.6V range.
How should unused inputs be handled on the SN74LVC125AD?
All unused inputs on the SN74LVC125AD - whether A or OE - must be tied to a defined logic level (VCC or GND) to prevent floating states that cause increased ICC, noise coupling, or undefined outputs. TI recommends connecting unused OE pins to VCC via a pull-up resistor to ensure outputs remain in high-Z during power-up; unused A inputs may be tied directly to VCC or GND based on desired default state.
Is the SN74LVC125AD pin-compatible with older 74LS125 devices?
No, the SN74LVC125AD is not pin-compatible with bipolar 74LS125. While both are quadruple 3-state buffers, the SN74LVC125AD uses CMOS technology with different input thresholds, output drive, and power supply requirements (1.65–3.6V vs. 4.75–5.25V). Pin assignments differ: LS125 has OE on pins 1/2/13/14, whereas SN74LVC125AD places OE on pins 1/4/10/13 - requiring PCB redesign for replacement.
What is the thermal resistance (RθJA) of the SN74LVC125AD in SOIC-14 package?
The SN74LVC125AD in SOIC-14 (D) package has a junction-to-ambient thermal resistance (RθJA) of 127.8°C/W, measured under standard JEDEC conditions (single-layer 1-in² copper pad). This value assumes proper PCB layout with adequate copper pour and thermal vias; derating begins above 70°C ambient, decreasing power dissipation by 8mW/°C.
SN74LVC125AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74LVC125AD FAQ
1.How can I place an order for SN74LVC125AD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125AD 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 SN74LVC125AD reliable?
The price and inventory of SN74LVC125AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125AD is usually 5 days.
3.What payment methods are accepted for SN74LVC125AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125AD?
SN74LVC125AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125AD 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 SN74LVC125AD?
For technical support, including SN74LVC125AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125AD requirements.
6.How does Aetrix verify that SN74LVC125AD is sourced from the original manufacturer or authorized distributors?
All SN74LVC125AD 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 SN74LVC125AD meets industry standards.
7.What is the process for return or replacement of SN74LVC125AD?
All SN74LVC125AD units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125AD, 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 SN74LVC125AD part is unused and in its original packaging.
Return procedure for SN74LVC125AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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