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Texas Instruments SN74LVC125ANSR
- Part No.:
- SN74LVC125ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC125ANSR.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,611
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Product details
Overview
SN74LVC125ANSR 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. It serves as an interface buffer in telecom baseband units and optical networking modules.
For engineers reviewing the SN74LVC125ANSR datasheet, SN74LVC125ANSR pinout, SN74LVC125ANSR application, or SN74LVC125ANSR equivalent, key selection criteria include 3-state output control per channel, VI tolerance up to 5.5V, guaranteed tpd ≤ 4.8 ns at 3.3V, thermal performance (RθJA = 123.8°C/W), and SOP-14 package compatibility with legacy 14-pin logic footprints.
Technical Context
The SN74LVC125ANSR implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Each buffer passes A→Y when its OE is low and enters high-impedance state when OE is high - enabling bidirectional bus sharing without contention.
Its CMOS design supports voltage translation: 5V-tolerant inputs allow interfacing with legacy 5V logic while driving 3.3V or lower downstream loads. The device requires external pull-up on OE pins during power sequencing to ensure defined high-Z state at startup/shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - enables operation across LVC-family supply rails including 1.8V, 2.5V, and 3.3V systems |
| Input Voltage Tolerance | Up to 5.5V - permits direct connection to 5V logic without level-shifting circuitry |
| tpd (max) | 4.8ns at VCC = 3.3V - supports >100 MHz data rates in buffered address/data paths |
| Operating Temperature | –40°C to 125°C - qualified for industrial and telecom infrastructure environments |
| I/O Drive Strength | ±24mA at VCC = 3.0V - sufficient to drive 50Ω transmission lines or multiple CMOS loads |
| Power Dissipation | 500mW max (TA ≤ 125°C) - compatible with standard SOIC-14 thermal derating curves |
| Cpd | 15pF at 3.3V - determines dynamic power consumption in high-frequency switching applications |
Pinout & Package
SOP-14 (NS) package: 10.2mm × 7.8mm body, 14-pin surface-mount with gull-wing leads; RoHS-compliant, NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable input | Individually disables corresponding Y output into high-impedance state; must be pulled high via resistor during power-up |
| 1A–4A | Buffer input | Noninverting data input for each of four channels; accepts 0–5.5V regardless of VCC |
| 1Y–4Y | Buffer output | 3-state noninverting output; drives load when OE = low, high-Z when OE = high |
| VCC | Positive supply | Single 1.65–3.6V rail powers all four buffers and I/O structures |
| GND | Ground reference | Common return path for supply and signal currents; requires low-inductance PCB connection |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective bus gating without affecting other channels - critical for multi-drop data arbitration |
| 5.5V-tolerant inputs | Eliminates need for external level shifters when interfacing 5V microcontrollers or FPGAs to 3.3V subsystems |
| Low propagation delay (≤4.8ns) | Preserves timing margins in high-speed parallel interfaces such as memory address latching or FPGA I/O expansion |
| Latch-up immunity (>250mA) | Meets JESD17 requirements - ensures robustness against transient current surges in noisy telecom environments |
| Wide temperature range (–40°C to 125°C) | Validated for deployment in outdoor telecom shelters, remote radio units, and power distribution units |
Applications
| Telecom Baseband Units | Optical Networking Modules |
|---|---|
|
Use Scenario: Isolating FPGA I/O banks from backplane data buses in LTE/5G baseband processing cards. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-channel 3-state control to prevent contention during DMA transfers. Use Value: 5.5V-tolerant inputs accept FPGA configuration voltages; 4.8ns tpd maintains setup/hold timing across 100+ MHz parallel buses. |
Use Scenario: Level-translating control signals between 5V management MCU and 3.3V EPON transceiver ASIC. IC Role / Device Role / Timing Role: Unidirectional voltage translator enabling interoperability across mixed-supply domains. Use Value: Eliminates discrete resistor-divider networks; guaranteed operation at –40°C to 125°C matches optical module thermal envelope. |
| Remote Radio Units (RRU) | Power Distribution Units (PDU) |
|
Use Scenario: Buffering antenna calibration data lines between RF front-end ICs and baseband processor in tower-mounted RRUs. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer ensuring signal integrity over 10cm PCB traces in RF-dense enclosures. Use Value: ±24mA drive strength sustains logic levels under capacitive loading; RθJA = 123.8°C/W supports natural convection cooling. |
Use Scenario: Isolating microcontroller GPIOs from relay driver circuits in telecom shelter PDUs. IC Role / Device Role / Timing Role: Digital isolator replacement providing galvanic separation via 3-state bus architecture. Use Value: Independent OE pins allow sequential activation of multiple relays; latch-up immunity prevents failure during load-switching transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125ADRG4 | SOP-14 package, identical electrical specs, same marking (LVC125A), NIPDAU finish, MSL Level-1 | No functional difference; differs only in tape-and-reel packaging quantity (2500 vs. 2000 units) | Select SN74LVC125ADRG4 for higher-volume automated assembly where reel size optimization is required. |
| SN74LVC125APWR | TSSOP-14 package (5.0mm × 6.4mm), same specs, SN/NIPDAU finish, MSL Level-1 | Smaller footprint and lower profile; higher RθJA (150.8°C/W) requires enhanced thermal layout | Choose SN74LVC125APWR when board space is constrained and thermal management can be augmented with copper pour or airflow. |
Compared with SN74LVC125ANSR, SN74LVC125ADRG4 offers identical performance in a larger reel format ideal for high-throughput SMT lines, while SN74LVC125APWR reduces PCB area by 35% but demands careful thermal design due to its 22% higher junction-to-ambient resistance.
Availability
SN74LVC125ANSR is available at Aetrix Electronics and suitable for telecom baseband units, optical networking modules, and remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC125ANSR 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 logic solutions with decades of reliability validation in industrial and communications infrastructure.
The SN74LVC125A product line delivers 3-state CMOS bus buffers optimized for voltage translation and bus isolation in mixed-supply telecom, networking, and test equipment applications.
FAQ
What is the maximum input voltage rating for SN74LVC125ANSR?
The SN74LVC125ANSR supports input voltages up to 5.5V across its entire operating temperature range, independent of VCC. This allows direct interfacing with 5V logic families without external level-shifting components, making SN74LVC125ANSR ideal for mixed-voltage system integration.
Does SN74LVC125ANSR require external pull-up resistors on OE pins?
Yes - to guarantee high-impedance outputs during power-up and power-down, each OE pin of SN74LVC125ANSR must be tied to VCC through an external pull-up resistor. The minimum value depends on the driver's current-sourcing capability, typically 10kΩ for standard applications.
What is the thermal resistance (RθJA) of SN74LVC125ANSR in its SOP-14 package?
The SN74LVC125ANSR in the NS (SOP-14) package has a junction-to-ambient thermal resistance of 123.8°C/W, measured under standard JEDEC conditions. This value informs thermal design margining for continuous operation at elevated ambient temperatures up to 125°C.
Can SN74LVC125ANSR drive a 50Ω transmission line directly?
Yes - SN74LVC125ANSR provides ±24mA output drive at VCC = 3.0V, sufficient to drive unterminated 50Ω lines or lightly loaded stubs. For controlled-impedance routing, series termination near the driver is recommended to suppress reflections, especially above 50 MHz.
Is SN74LVC125ANSR pin-compatible with older 74LS125 devices?
No - SN74LVC125ANSR uses a modern CMOS process with different DC and AC characteristics. While both are quad 3-state buffers in 14-pin packages, SN74LVC125ANSR has 5.5V-tolerant inputs, lower supply voltage range (1.65–3.6V), and faster propagation delay than bipolar 74LS125, requiring schematic and layout review before substitution.
SN74LVC125ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-SOIC (0.209", 5.30mm 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-SO
SN74LVC125ANSR FAQ
1.How can I place an order for SN74LVC125ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125ANSR 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 SN74LVC125ANSR reliable?
The price and inventory of SN74LVC125ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125ANSR is usually 5 days.
3.What payment methods are accepted for SN74LVC125ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125ANSR?
SN74LVC125ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125ANSR 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 SN74LVC125ANSR?
For technical support, including SN74LVC125ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125ANSR requirements.
6.How does Aetrix verify that SN74LVC125ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LVC125ANSR 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 SN74LVC125ANSR meets industry standards.
7.What is the process for return or replacement of SN74LVC125ANSR?
All SN74LVC125ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125ANSR, 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 SN74LVC125ANSR part is unused and in its original packaging.
Return procedure for SN74LVC125ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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