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Texas Instruments SN74LVC125ADT
- Part No.:
- SN74LVC125ADT
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC125ADT.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:398
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Product details
Overview
SN74LVC125ADT from Texas Instruments is a quadruple 3-state bus buffer gate operating from 1.65V to 3.6V, featuring independent output-enable (OE) inputs per channel, 5.5V-tolerant inputs, and 4.8ns max propagation delay at 3.3V. It enables bidirectional signal isolation in mixed-voltage telecom backplane and baseband unit interfaces.
For engineers reviewing the SN74LVC125ADT datasheet, SN74LVC125ADT pinout, SN74LVC125ADT application, or SN74LVC125ADT equivalent, key selection criteria include 3-state drive capability, VCC range compatibility, input overvoltage tolerance, thermal derating behavior in SOIC-14, and OE-controlled channel enable timing.
Technical Context
The SN74LVC125ADT implements four independent noninverting buffers, each with dedicated OE control enabling high-impedance output when OE = HIGH. Its CMOS design supports rail-to-rail output swing and operates across –40°C to +125°C ambient temperature.
Each channel functions as a voltage-level translator: inputs accept up to 5.5V regardless of VCC (1.65–3.6V), allowing safe interfacing between 3.3V logic and legacy 5V systems without external level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables operation in low-power 1.8V/2.5V/3.3V domains while maintaining full logic functionality. |
| Input Voltage Tolerance | Up to 5.5V - Allows direct connection to 5V sources without clamping diodes or external protection. |
| Max Propagation Delay | 4.8ns at 3.3V - Supports >100MHz data rates in buffered address/data bus applications. |
| Output Drive Strength | ±24mA at 3.0V - Sufficient to drive 50Ω transmission lines or multiple LVC loads without fanout limitation. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and telecom infrastructure environments including RRUs and PDUs. |
| ESD Rating (HBM) | ±2000V - Meets JEDEC JS-001 requirements for robust handling in automated assembly and field service. |
Pinout & Package
SN74LVC125ADT uses the SOIC-14 (D) package: 8.6 mm × 6.0 mm body, 14-pin gull-wing lead frame, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Input | Active-low enable control per buffer; HIGH forces Y output into high-impedance state. |
| 1A–4A | Input | Data input for corresponding buffer channel; accepts 0–5.5V regardless of VCC. |
| 1Y–4Y | Output | Noninverting buffered output; drives to VCC or GND with ±24mA capability at 3V. |
| VCC | Power | Primary supply (1.65–3.6V); requires local 0.1μF bypass capacitor adjacent to pin 14. |
| GND | Ground | Reference return path for all I/O and internal logic; must be low-impedance connection. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-State Control | Four separate OE inputs allow selective channel disabling-critical for bus arbitration and hot-swap isolation. |
| 5.5V-Tolerant Inputs | Eliminates need for external level shifters when interfacing with 5V peripherals in 3.3V systems. |
| Low Propagation Delay | 4.8ns max at 3.3V enables use in high-speed data paths such as baseband unit interconnects. |
| Wide Temperature Range | –40°C to +125°C operation supports deployment in outdoor telecom shelters and remote radio units. |
| High Noise Immunity | Typical VOHV >2V and VOLP <0.8V at 3.3V reduce false triggering in noisy RF-dense environments. |
Applications
| Telecom Baseband Units | Remote Radio Units (RRU) |
|---|---|
Use Scenario: Isolating FPGA I/O banks from analog front-end ASICs in multi-carrier LTE/5G baseband processing. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer managing shared JESD204B or CPRI data lanes during calibration or fault recovery. Use Value: Prevents bus contention during partial reconfiguration; 5.5V-tolerant inputs simplify interface to legacy DAC/ADC supervisors. |
Use Scenario: Signal routing between digital predistortion (DPD) processor and wideband RF transceiver in active antenna systems. IC Role / Device Role / Timing Role: Voltage-translating bus buffer enabling 3.3V DPD logic to drive 5V bias control lines for GaN PA modules. Use Value: Eliminates discrete level-shifters; ±24mA drive ensures fast settling on high-capacitance PA enable lines. |
| Power Distribution Units (PDU) | Optical Networking Modules |
Use Scenario: Monitoring and controlling isolated DC/DC converter rails in telecom shelter power systems. IC Role / Device Role / Timing Role: Buffering status signals (OV/UV/fault) from isolated sense ICs to microcontroller GPIOs. Use Value: 125°C rating ensures reliability near heat-generating converters; 3-state outputs support shared status bus architecture. |
Use Scenario: Interfacing host controller to SFP+ or QSFP transceivers in EPON OLT line cards. IC Role / Device Role / Timing Role: Level-shifting and buffering I²C management bus signals between 3.3V SoC and 5V transceiver EEPROMs. Use Value: Input overvoltage tolerance prevents damage during hot-plug events; low tpd maintains I²C timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125ADR | Same SOIC-14 package, identical electrical specs, but supplied in 2500-piece tape-and-reel vs. 250-piece small reel. | No functional difference; suited for high-volume production rather than prototyping or low-MOQ builds. | Select SN74LVC125ADR for cost-optimized volume procurement; SN74LVC125ADT preferred for evaluation and pilot runs. |
| 74LVC125APW | TSSOP-14 package (5.0mm × 6.4mm), same logic function and specs, but different thermal resistance (RθJA = 150.8°C/W vs. 127.8°C/W for SOIC). | Better PCB space efficiency but higher thermal impedance; requires tighter layout attention in thermally constrained RRUs. | Choose 74LVC125APW only when board area is critical and thermal margin allows; SN74LVC125ADT offers superior thermal performance in standard layouts. |
Compared with SN74LVC125ADR and 74LVC125APW, the SN74LVC125ADT provides optimal balance of thermal robustness (127.8°C/W), low-MOQ availability (250 pcs), and proven reliability in telecom infrastructure-making it ideal for design-in validation and medium-batch production.
Availability
SN74LVC125ADT is available at Aetrix Electronics and suitable for telecom baseband units, remote radio units, and power distribution units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74LVC125ADT 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 solutions for industrial, automotive, and communications markets.
The SN74LVC125ADT belongs to TI's LVC logic family, designed specifically for low-voltage, high-speed, mixed-signal interfacing in telecom infrastructure and wireless base stations.
FAQ
What is the maximum input voltage the SN74LVC125ADT can tolerate?
The SN74LVC125ADT accepts input voltages up to 5.5V across its entire operating VCC range (1.65V–3.6V). This overvoltage tolerance is specified in Section 5.1 Absolute Maximum Ratings and confirmed in Section 5.3 Recommended Operating Conditions. It enables direct interfacing with 5V peripherals without external protection, making the SN74LVC125ADT suitable for mixed-voltage system integration in telecom baseband units and optical modules.
Does the SN74LVC125ADT support operation at 125°C ambient temperature?
Yes, the SN74LVC125ADT is fully specified and qualified for continuous operation from –40°C to +125°C ambient temperature, as stated in both the Features section and Section 5.3 Recommended Operating Conditions. Its SOIC-14 package has a junction-to-ambient thermal resistance (RθJA) of 127.8°C/W, and derating curves in Section 5.4 confirm reliable performance at full rated current under these conditions-critical for deployment in telecom shelters and remote radio units.
How does the SN74LVC125ADT handle power-up sequencing?
To ensure high-impedance outputs during power-up or power-down, the SN74LVC125ADT requires OE pins to be tied to VCC via a pullup resistor, as detailed in Section 3 Description and Figure 8-4 Layout Example. The minimum resistor value depends on the driver's current-sourcing capability; TI recommends starting with 10kΩ and verifying behavior under worst-case VCC ramp rates. This prevents bus contention before system controllers initialize-essential in telecom PDU and RRU designs.
What is the typical power dissipation capacitance of the SN74LVC125ADT?
The SN74LVC125ADT has a typical power dissipation capacitance (Cpd) of 15 pF per gate at VCC = 3.3V and f = 10 MHz, as specified in Section 5.7 Operating Characteristics. This value directly impacts dynamic power consumption: at 100MHz switching, one enabled buffer consumes approximately 5mW. Engineers use Cpd to calculate total Icc in high-fanout applications like EPON line cards where multiple SN74LVC125ADT channels drive parallel buses.
Can the SN74LVC125ADT be used as a level shifter between 3.3V and 5V logic domains?
Yes-the SN74LVC125ADT functions as a unidirectional level shifter from 5V inputs to 3.3V-compatible outputs. Its 5.5V-tolerant inputs accept 5V signals while operating at VCC = 3.3V, and its outputs swing rail-to-rail (0V to 3.3V). As shown in Figure 8-1 Typical Application, this enables clean interfacing between legacy 5V supervisory circuits and modern 3.3V FPGAs in telecom baseband units-without additional components or timing penalties.
SN74LVC125ADT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74LVC125ADT FAQ
1.How can I place an order for SN74LVC125ADT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125ADT 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 SN74LVC125ADT reliable?
The price and inventory of SN74LVC125ADT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125ADT is usually 5 days.
3.What payment methods are accepted for SN74LVC125ADT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125ADT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125ADT?
SN74LVC125ADT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125ADT 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 SN74LVC125ADT?
For technical support, including SN74LVC125ADT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125ADT requirements.
6.How does Aetrix verify that SN74LVC125ADT is sourced from the original manufacturer or authorized distributors?
All SN74LVC125ADT 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 SN74LVC125ADT meets industry standards.
7.What is the process for return or replacement of SN74LVC125ADT?
All SN74LVC125ADT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125ADT, 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 SN74LVC125ADT part is unused and in its original packaging.
Return procedure for SN74LVC125ADT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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