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Texas Instruments SN74LVC125ADG4
- Part No.:
- SN74LVC125ADG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC125ADG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,927
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Product details
Overview
SN74LVC125ADG4 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 SN74LVC125ADG4 datasheet, SN74LVC125ADG4 pinout, SN74LVC125ADG4 application, or SN74LVC125ADG4 equivalent, key selection criteria include 3-state output control per channel, VCC-independent input voltage tolerance, thermal performance in SOIC-14 (RθJA = 127.8°C/W), and compatibility with 3.3V/5V interface bridging in high-reliability infrastructure designs.
Technical Context
The SN74LVC125ADG4 implements four independent non-inverting 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 - supporting bidirectional bus arbitration and dynamic load isolation.
Its CMOS design enables overvoltage-tolerant inputs (up to 5.5V) while operating from 1.65V–3.6V VCC, making it suitable for voltage-level translation between legacy 5V logic and modern 3.3V or 2.5V domains without external level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - enables interoperability across 1.8V, 2.5V, and 3.3V logic families |
| Input Voltage Tolerance | Up to 5.5V - allows direct connection to 5V outputs without clamping diodes or resistors |
| tpd (Max) | 4.8ns at VCC = 3.3V - supports >100MHz data rates in buffered address/data paths |
| Operating Temperature | –40°C to 125°C - qualified for industrial and telecom outdoor equipment environments |
| IOL/IOH | ±24mA at VCC = 3.0V - drives standard TTL loads and short PCB traces without buffering |
| ESD Rating (HBM) | ±2000V - meets JEDEC JS-001 for robust handling in automated assembly lines |
Pinout & Package
SN74LVC125ADG4 is supplied in a 14-pin SOIC (D) package measuring 8.6 mm × 6 mm, with body size 8.65 mm × 3.91 mm and RoHS-compliant NiPdAu lead finish. The package has standard JEDEC MS-012AC footprint and Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable input | Independent control per buffer; tie to VCC via pull-up resistor to ensure Hi-Z during power-up |
| 1A–4A | Data input | Non-inverting input for corresponding buffer channel; accepts 0–5.5V regardless of VCC |
| 1Y–4Y | 3-state output | Drives bus or downstream logic; high-impedance when OE = high; VOL ≤ 0.6V @ IOL = 4mA |
| VCC (Pin 14) | Positive supply | Single supply rail for all four buffers; bypass with 0.1μF capacitor close to pin |
| GND (Pin 7) | Ground reference | Common return path; must be low-inductance connection to minimize ground bounce (VOLP < 0.8V) |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective bus segment isolation without affecting other channels - critical for multi-drop backplane arbitration |
| 5.5V-tolerant inputs on 1.65V–3.6V supply | Eliminates external level translators when interfacing 5V microcontrollers or legacy peripherals to low-voltage FPGAs |
| Low ground bounce (VOLP < 0.8V) | Reduces noise coupling into adjacent analog or RF sections in dense telecom modules |
| Latch-up immunity > 250mA | Ensures robustness against transient faults in power-supply switching environments like DC/DC module control boards |
| –40°C to 125°C operational range | Supports deployment in uncontrolled ambient enclosures such as remote radio units (RRUs) and tower-mounted amplifiers (TMAs) |
Applications
| Telecom Baseband Units | Optical Networking Line Cards |
|---|---|
Use Scenario: Buffering and isolating parallel control/data buses between FPGA fabric and multiple ADC/DAC or SERDES interfaces in 5G baseband processing units. IC Role / Device Role / Timing Role: Quad non-inverting buffer with per-channel 3-state control acts as programmable bus gatekeeper and voltage translator. Use Value: Enables safe 3.3V FPGA-to-5V DAC communication while preventing bus contention during partial reconfiguration cycles. |
Use Scenario: Interfacing host processor GPIOs to EPON OLT/ONU management interfaces requiring 5V-compatible signaling despite 3.3V core logic. IC Role / Device Role / Timing Role: Level-translating bus buffer providing fault-isolated control path for laser bias and monitor circuits. Use Value: Eliminates need for discrete MOSFET translators, reducing BOM count and layout area in space-constrained SFP+ modules. |
| Industrial Power Monitoring Units | Wireless Infrastructure Test Equipment |
Use Scenario: Isolating digital status signals (e.g., fault flags, temperature alerts) from isolated DC/DC converter monitoring ICs to main controller across different ground domains. IC Role / Device Role / Timing Role: Voltage-tolerant buffer ensures reliable signal transfer without ground-loop-induced corruption. Use Value: Maintains signal integrity under fast transients (e.g., load dump) due to low ground bounce and high ESD immunity. |
Use Scenario: Driving multiple test point headers or DUT interface connectors from a single FPGA I/O bank in WiMAX protocol analyzers. IC Role / Device Role / Timing Role: Output-enabling quad buffer provides flexible signal routing and fan-out expansion. Use Value: Delivers sub-5ns propagation delay and ±24mA drive strength to meet setup/hold timing for high-speed pattern generators. |
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. 50-piece tube | No functional difference; optimized for automated SMT production rather than prototyping or low-volume repair | Select SN74LVC125ADR for volume manufacturing; SN74LVC125ADG4 remains optimal for engineering validation and small-batch builds |
| 74LVC125APW | TSSOP-14 package (5.0mm × 6.4mm), same logic function and specs, but lower RθJA (150.8°C/W) and different land pattern | Preferred where board space is constrained and thermal margin is acceptable; not drop-in compatible with SOIC footprints | Choose 74LVC125APW only when redesigning PCB layout for miniaturization; requires footprint change and requalification |
Compared with SN74LVC125ADR and 74LVC125APW, the SN74LVC125ADG4 offers immediate SOIC-14 compatibility for hand-soldered evaluation and field replacement, maintains full spec compliance at 125°C, and simplifies inventory by aligning with standard tube-based procurement workflows.
Availability
SN74LVC125ADG4 is available at Aetrix Electronics and suitable for telecom baseband units, optical networking line cards, and industrial power monitoring units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74LVC125ADG4 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.
The SN74LVC125ADG4 belongs to TI's LVC logic family, engineered for low-voltage operation, mixed-signal interface bridging, and robust performance in infrastructure-grade communications and industrial control systems.
FAQ
What is the maximum input voltage the SN74LVC125ADG4 can tolerate?
The SN74LVC125ADG4 accepts input voltages up to 5.5V regardless of VCC level - a feature confirmed in Section 5.3 of the datasheet. This allows direct interfacing with 5V logic outputs while operating from 1.65V–3.6V supplies. The SN74LVC125ADG4 does not require external clamping or level-shifting circuitry in mixed-voltage systems.
Does the SN74LVC125ADG4 support operation at 125°C ambient temperature?
Yes, the SN74LVC125ADG4 is fully specified and tested for continuous operation from –40°C to +125°C ambient, as stated in both the Features and Recommended Operating Conditions sections. Its SOIC-14 package has RθJA = 127.8°C/W, enabling thermal compliance in sealed telecom shelters and remote radio units when properly heatsinked.
How should unused inputs be handled on the SN74LVC125ADG4?
All unused inputs on the SN74LVC125ADG4 must be tied to either VCC or GND to prevent floating states that cause excessive current draw or erratic behavior. Section 8.3.1 explicitly mandates this, and TI application report SCBA004 details risks of slow or floating CMOS inputs. Leaving inputs unconnected violates recommended practice and may compromise SN74LVC125ADG4 reliability.
What is the typical propagation delay of the SN74LVC125ADG4 at 3.3V?
The typical propagation delay (tpd) of the SN74LVC125ADG4 is 2.5ns at VCC = 3.3V ± 0.3V and TA = 25°C, with a maximum of 4.8ns across –40°C to 125°C. This value is measured under standard load conditions (CL = 30pF) and confirms suitability for high-speed data paths in baseband and test equipment applications.
Is the SN74LVC125ADG4 pin-compatible with other members of the SN74LVC125A family?
Yes - all SN74LVC125A variants, including SN74LVC125ADG4, SN74LVC125ADR, and SN74LVC125ADBR, share identical pin configuration and function mapping per Table 4-1. Differences are limited to package type, packaging format (tube vs. tape-and-reel), and marking; the SN74LVC125ADG4 retains full electrical and mechanical compatibility within the SOIC-14 variant group.
SN74LVC125ADG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
SN74LVC125ADG4 FAQ
1.How can I place an order for SN74LVC125ADG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125ADG4 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 SN74LVC125ADG4 reliable?
The price and inventory of SN74LVC125ADG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125ADG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC125ADG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125ADG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125ADG4?
SN74LVC125ADG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125ADG4 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 SN74LVC125ADG4?
For technical support, including SN74LVC125ADG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125ADG4 requirements.
6.How does Aetrix verify that SN74LVC125ADG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC125ADG4 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 SN74LVC125ADG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC125ADG4?
All SN74LVC125ADG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125ADG4, 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 SN74LVC125ADG4 part is unused and in its original packaging.
Return procedure for SN74LVC125ADG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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