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Texas Instruments SN74LVC125ABQAR
- Part No.:
- SN74LVC125ABQAR
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFQFN Exposed Pad
- Datasheet:
-
SN74LVC125ABQAR.pdf
- Description:
- FOUR-CHANNEL 1.65V-TO-3.6V BUFFE
- Quantity:
- Payment:
- Shipping:
Inventory:2,504
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Product details
Overview
SN74LVC125ABQAR 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 a bidirectional voltage translator in telecom baseband units and optical networking interfaces.
For engineers reviewing the SN74LVC125ABQAR datasheet, SN74LVC125ABQAR pinout, SN74LVC125ABQAR application, or SN74LVC125ABQAR equivalent, key selection criteria include 3-state output control per channel, VI tolerance up to 5.5V, guaranteed tpd ≤4.8ns at 3.3V, thermal resistance (RθJA = 102.3°C/W), and WQFN-14 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC125ABQAR implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Each channel passes A→Y when OE is low and enters high-impedance state when OE is high - enabling dynamic bus sharing without contention.
Its CMOS input structure accepts voltages up to 5.5V regardless of VCC, allowing direct interfacing with legacy 5V logic while operating at 1.8V/2.5V/3.3V supply rails. The device features controlled edge rates (Δt/Δv ≤ 8 ns/V) and low ground bounce (<0.8V typical VOLP) to minimize signal integrity issues in high-speed digital backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - enables operation across 1.8V, 2.5V, and 3.3V system rails without level shifters |
| Input Voltage Tolerance | Up to 5.5V - allows direct connection to 5V logic outputs in mixed-voltage designs |
| 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 |
| Output Drive | ±24mA at VCC = 3.0V - sufficient to drive 50Ω transmission lines or multiple CMOS loads |
| RθJA | 102.3°C/W (WQFN-14) - enables thermal management in compact, sealed enclosures without forced airflow |
| ESD Rating | ±2000V HBM - meets IEC 61000-4-2 Level 2 for board-level robustness |
Pinout & Package
SN74LVC125ABQAR uses a 14-pin WQFN (BQA) package measuring 3.0mm × 2.5mm with wettable flank leads, optimized for automated optical inspection (AOI) and thermal performance in space-constrained telecom modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Independent per-channel control; tie high via pullup to ensure Hi-Z during power-up |
| 1A–4A | Buffer input | 5.5V-tolerant CMOS inputs; accept 1.8V/2.5V/3.3V/5V logic levels |
| 1Y–4Y | Buffer output | 3-state CMOS outputs; drive bidirectional buses or isolated signal paths |
| VCC | Power supply | Single 1.65–3.6V rail; requires local 0.1μF bypass capacitor |
| GND | Ground reference | Common return for all I/O and supply; connect to solid ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective bus arbitration without external logic or timing constraints |
| 5.5V-tolerant inputs | Eliminates need for discrete level translators when interfacing with 5V microcontrollers or FPGAs |
| Low propagation delay (≤4.8ns @ 3.3V) | Supports high-throughput data routing in packet-processing pipelines and serial link repeaters |
| High noise immunity (VIL = 0.35×VCC, VIH = 0.65×VCC) | Ensures reliable switching in electrically noisy telecom shelters and RF front-end boards |
| Latch-up immunity (>250mA) | Guarantees robust operation under transient overvoltage or ESD events in field-deployed equipment |
Applications
| Telecom Baseband Units | Optical Networking Interfaces |
|---|---|
|
Use Scenario: Isolating FPGA I/O banks from high-speed serial interface transceivers in 5G baseband processing cards. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-lane 3-state control, enabling dynamic reconfiguration of JESD204B lanes. Use Value: Prevents signal contention during hot-swap of daughterboards while maintaining <4.8ns timing margin for 12.5 Gbps links. |
Use Scenario: Level-shifting between 3.3V MAC controllers and 5V SFP+ module management interfaces in EPON OLT line cards. IC Role / Device Role / Timing Role: Voltage translator with 5.5V-tolerant inputs, supporting SMBus and I²C communication across voltage domains. Use Value: Eliminates external level shifters, reducing BOM count and layout area in space-constrained optical module carriers. |
| Wireless Battery Monitoring | Remote Radio Units (RRU) |
|
Use Scenario: Buffering analog sensor readings and digital status signals from battery management ICs to a central telemetry MCU in tower-mounted battery cabinets. IC Role / Device Role / Timing Role: Low-power bus isolator with <10μA ICC standby current, enabling always-on monitoring without excessive quiescent draw. Use Value: Extends service life of backup batteries in remote sites by minimizing leakage current while preserving signal integrity over 10cm PCB traces. |
Use Scenario: Driving parallel control lines (e.g., gain setting, calibration enable) from an FPGA to multiple RF front-end ICs in multi-band RRUs. IC Role / Device Role / Timing Role: High-drive buffer (±24mA) with matched propagation delays across channels, ensuring synchronous RF path configuration. Use Value: Reduces skew-induced phase errors in beamforming arrays by guaranteeing <1.5ns inter-channel tsk(o) matching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APWR | TSSOP-14 package (5.0mm × 6.4mm); RθJA = 150.8°C/W; same electrical specs | Lower thermal performance; suitable for lower-power, ventilated chassis | Choose for legacy TSSOP-compatible footprints where WQFN rework is not feasible |
| 74LVC125AD | SOIC-14 package (8.6mm × 6.0mm); RθJA = 127.8°C/W; identical logic function and voltage specs | Higher board area usage; better hand-solderability and test probe access | Prefer for prototyping, repair, or cost-sensitive industrial controls where density is secondary |
Compared with SN74LVC125APWR and 74LVC125AD, the SN74LVC125ABQAR offers superior thermal efficiency (102.3°C/W) and smallest footprint (3.0mm × 2.5mm), making it optimal for thermally constrained, high-density telecom modules requiring long-term reliability at 125°C ambient.
Availability
SN74LVC125ABQAR is available at Aetrix Electronics and suitable for telecom baseband units, optical networking interfaces, and remote radio units requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for SN74LVC125ABQAR 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 SN74LVC125A family is part of TI's LVC logic portfolio, engineered for low-voltage, high-speed bus buffering and level translation in next-generation telecom infrastructure and high-reliability embedded systems.
FAQ
What is the maximum input voltage rating for SN74LVC125ABQAR?
The SN74LVC125ABQAR supports input voltages up to 5.5V across its entire operating VCC range (1.65V–3.6V). This 5.5V tolerance is absolute - no current-limiting resistor is required when interfacing with 5V logic sources, simplifying design in mixed-voltage systems where the SN74LVC125ABQAR acts as a translator between legacy and modern logic families.
Does SN74LVC125ABQAR require external pull-up resistors on OE pins?
Yes - to ensure predictable high-impedance behavior during power-up and power-down sequences, each OE pin of the SN74LVC125ABQAR must be tied to VCC through an external pull-up resistor. The minimum value depends on the driver's current-sourcing capability; TI recommends ≥10kΩ for most applications using the SN74LVC125ABQAR in telecom baseband or optical networking hardware.
What is the thermal resistance (RθJA) of SN74LVC125ABQAR?
The SN74LVC125ABQAR has a junction-to-ambient thermal resistance of 102.3°C/W in its WQFN-14 (BQA) package. This value assumes standard JEDEC 2-layer board conditions and enables continuous operation at full drive strength (±24mA) up to +125°C ambient - critical for deployment in sealed telecom shelters and outdoor wireless infrastructure where forced cooling is unavailable.
Can SN74LVC125ABQAR operate reliably at 1.65V supply?
Yes - the SN74LVC125ABQAR is fully specified down to 1.65V VCC, with guaranteed tpd ≤13.8ns and output drive ≥±4mA at that voltage. This makes the SN74LVC125ABQAR suitable for ultra-low-power subsystems such as wireless battery monitors, where supply rails may dip near minimum thresholds during peak load conditions.
Is SN74LVC125ABQAR pin-compatible with other LVC125 variants?
Yes - the SN74LVC125ABQAR shares identical pinout and functionality with all SN74LVC125A variants (e.g., SN74LVC125AD, SN74LVC125APWR, SN74LVC125ARGYR) across SOIC, TSSOP, VQFN, and WQFN packages. Signal pin assignments (1A–4Y, OE, VCC, GND) are standardized per TI's LVC logic family, enabling drop-in replacement where package and thermal requirements align.
SN74LVC125ABQAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-WFQFN Exposed Pad
- 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-WQFN (3x2.5)
SN74LVC125ABQAR FAQ
1.How can I place an order for SN74LVC125ABQAR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125ABQAR 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 SN74LVC125ABQAR reliable?
The price and inventory of SN74LVC125ABQAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125ABQAR is usually 5 days.
3.What payment methods are accepted for SN74LVC125ABQAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125ABQAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125ABQAR?
SN74LVC125ABQAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125ABQAR 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 SN74LVC125ABQAR?
For technical support, including SN74LVC125ABQAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125ABQAR requirements.
6.How does Aetrix verify that SN74LVC125ABQAR is sourced from the original manufacturer or authorized distributors?
All SN74LVC125ABQAR 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 SN74LVC125ABQAR meets industry standards.
7.What is the process for return or replacement of SN74LVC125ABQAR?
All SN74LVC125ABQAR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125ABQAR, 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 SN74LVC125ABQAR part is unused and in its original packaging.
Return procedure for SN74LVC125ABQAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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