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Texas Instruments SN74LVC125ADTG4
- Part No.:
- SN74LVC125ADTG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC125ADTG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,901
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Product details
Overview
SN74LVC125ADTG4 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 SN74LVC125ADTG4 datasheet, SN74LVC125ADTG4 pinout, SN74LVC125ADTG4 application, or SN74LVC125ADTG4 equivalent, key selection criteria include its independent OE control per channel, 3.6V max VCC, 5.5V input tolerance, 14-pin SOIC (D) package, and compatibility with 3.3V/5V interface bridging in telecom infrastructure designs.
Technical Context
The SN74LVC125ADTG4 implements four independent noninverting buffers, each with dedicated output-enable (OE) logic that places the Y output in high-impedance when OE is high. Its CMOS design enables bidirectional voltage translation: 5V inputs safely drive 3.3V outputs without external level shifters.
Each buffer features balanced drive strength (±24mA at 3V), low ground bounce (<0.8V typical VOLP), and undershoot immunity (>2V VOHV), supporting clean signal integrity in high-speed digital backplanes and dense PCB layouts where simultaneous switching noise must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V–3.6V - enables direct integration into 3.3V systems while maintaining compatibility with legacy 2.5V logic rails |
| Input Voltage Tolerance | Up to 5.5V - allows direct connection to 5V microcontrollers or legacy peripherals without external clamping |
| Max Propagation Delay | 4.8ns at 3.3V - supports >100MHz data rates in buffered address/data bus applications |
| Output Drive Strength | ±24mA at VCC = 3V - sufficient to drive 50Ω transmission lines or multiple LVC/LVT inputs without fanout limitation |
| Operating Temperature | –40°C to 125°C - qualified for industrial and telecom outdoor equipment including RRUs and TMAs |
| ESD Rating | ±2000V HBM - meets IEC 61000-4-2 Level 2 for system-level robustness in field-deployed hardware |
Pinout & Package
SN74LVC125ADTG4 uses the 14-pin SOIC (D) package (8.6 mm × 6 mm body), optimized for automated assembly and thermal performance in telecom power modules and baseband boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Independent Output Enable Inputs | Active-low control per buffer; enables selective bus segmentation without affecting other channels |
| 1A–4A | Buffer Input Terminals | Accept 5.5V-tolerant signals; compatible with both 3.3V and 5V logic families |
| 1Y–4Y | Noninverting 3-State Outputs | High-impedance state when OE = HIGH; driven LOW/HIGH only when OE = LOW |
| VCC (Pin 14) | Positive Supply | Single 1.65–3.6V rail powers all four buffers; no auxiliary supplies required |
| GND (Pin 7) | Ground Reference | Common return path for all I/O and internal circuitry; critical for noise suppression in mixed-signal environments |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel OE | Enables dynamic bus partitioning - e.g., isolate memory subsystems during firmware updates without halting CPU operation |
| 5.5V-tolerant inputs | Eliminates need for discrete level translators when interfacing FPGA I/O banks or MCU GPIOs operating at 5V |
| Low ground bounce (VOLP < 0.8V) | Reduces simultaneous switching noise in multi-buffer configurations, preserving signal integrity on shared VCC/GND planes |
| Wide temperature range (–40°C to 125°C) | Validated for deployment in uncooled telecom shelters, remote radio units, and outdoor small cells |
| High ESD immunity (±2000V HBM) | Supports handling and board-level integration in standard manufacturing environments without special ESD protocols |
Applications
| Telecom Baseband Unit | Optical Networking Line Card |
|---|---|
Use Scenario: Buffering and isolating JESD204B serializer/deserializer lanes between FPGA and ADC/DAC in wireless baseband processing. IC Role / Device Role / Timing Role: Signal integrity-preserving bus buffer with independent OE control per lane to enable dynamic reconfiguration of data paths. Use Value: Enables hot-swap capability and partial reconfiguration without disrupting adjacent RF chains or timing synchronization. | Use Scenario: Interfacing 5V management microcontrollers to 3.3V SFP+ transceiver control buses in EPON OLT line cards. IC Role / Device Role / Timing Role: Voltage-level translator and bus isolator ensuring safe communication across mixed-supply domains. Use Value: Prevents latch-up and overvoltage damage while maintaining sub-5ns timing margins for I²C/SMBus clock stretching. |
| Remote Radio Unit (RRU) | Power Distribution Unit (PDU) |
Use Scenario: Isolating FPGA configuration interfaces from analog front-end ASICs in compact RRUs subject to thermal cycling. IC Role / Device Role / Timing Role: 3-state buffer providing controlled signal gating during power sequencing and reset assertion. Use Value: Guarantees glitch-free startup and prevents metastability in clock domain crossings under –40°C cold-start conditions. | Use Scenario: Buffering PMBus commands between 3.3V host controller and multiple 5V DC/DC module monitors in telecom PDUs. IC Role / Device Role / Timing Role: Robust digital interface conditioner tolerant to supply rail mismatches and transient coupling. Use Value: Ensures reliable telemetry reporting and fault response even during brownout events affecting individual DC/DC stages. |
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 electrical specs and pinout; differs only in packaging (2500-piece tape-and-reel vs. 250-piece small tape) | Identical functional use in telecom baseband and optical modules; suited for high-volume production runs | Select SN74LVC125ADR for cost-optimized large-batch procurement; SN74LVC125ADTG4 preferred for prototyping and low-MOQ builds |
| 74LVC125APW | TSSOP-14 package (5.0mm × 6.4mm); identical logic and specs but smaller footprint and higher thermal resistance (RθJA = 150.8°C/W) | Better suited for space-constrained optical modules or compact RRU control boards where board area is premium | Choose 74LVC125APW when layout density outweighs thermal margin requirements; verify local heatsinking if operating near 125°C |
Compared with SN74LVC125ADR and 74LVC125APW, SN74LVC125ADTG4 offers the same core buffering functionality in a readily available SOIC-14 variant optimized for manual soldering, test fixture compatibility, and mid-volume telecom deployments requiring traceable small-batch sourcing.
Availability
SN74LVC125ADTG4 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 SN74LVC125ADTG4 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 SN74LVC125ADTG4 belongs to TI's LVC logic family - engineered for low-voltage, high-speed, mixed-supply interface bridging in telecom infrastructure, optical networking, and industrial control systems.
FAQ
What is the maximum input voltage rating for SN74LVC125ADTG4?
The SN74LVC125ADTG4 supports input voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic devices while powered from 1.65V–3.6V supplies. This overvoltage tolerance eliminates external clamping diodes in mixed-voltage systems and is verified per TI's recommended operating conditions table (Section 5.3).
Does SN74LVC125ADTG4 require pull-up resistors on OE pins?
Yes - to ensure high-impedance outputs during power-up or power-down, each OE pin should be tied to VCC via a pull-up resistor. The minimum value depends on the driver's current-sourcing capability, as specified in the TI datasheet Section 3. This prevents bus contention and undefined states in telecom and optical systems with complex power sequencing.
What is the propagation delay of SN74LVC125ADTG4 at 3.3V operation?
At VCC = 3.3V ± 0.3V and TA = 25°C, the SN74LVC125ADTG4 exhibits a typical propagation delay (tpd) of 2.5ns and a maximum of 4.8ns. This specification is measured under standard load conditions (30pF, Δt/Δv = 8ns/V) and supports reliable operation in high-speed data paths such as JESD204B lanes and PMBus command routing in telecom PDUs.
Can SN74LVC125ADTG4 operate reliably at 125°C ambient temperature?
Yes - the SN74LVC125ADTG4 is fully specified and tested for continuous operation from –40°C to +125°C ambient. Thermal metrics (RθJA = 127.8°C/W for SOIC-14) and electrical characteristics tables explicitly include this extended range, making it suitable for deployment in uncooled RRUs, tower-mounted amplifiers, and outdoor telecom shelters.
Is SN74LVC125ADTG4 RoHS compliant and lead-free?
Yes - SN74LVC125ADTG4 is RoHS-compliant and features a NIPDAU (nickel-palladium-gold) lead finish. It carries an MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified for peak reflow temperatures up to 260°C, meeting IPC/JEDEC J-STD-020 standards for lead-free assembly in telecom and industrial manufacturing.
SN74LVC125ADTG4 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:
- 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
SN74LVC125ADTG4 FAQ
1.How can I place an order for SN74LVC125ADTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125ADTG4 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 SN74LVC125ADTG4 reliable?
The price and inventory of SN74LVC125ADTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125ADTG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC125ADTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125ADTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125ADTG4?
SN74LVC125ADTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125ADTG4 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 SN74LVC125ADTG4?
For technical support, including SN74LVC125ADTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125ADTG4 requirements.
6.How does Aetrix verify that SN74LVC125ADTG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC125ADTG4 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 SN74LVC125ADTG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC125ADTG4?
All SN74LVC125ADTG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125ADTG4, 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 SN74LVC125ADTG4 part is unused and in its original packaging.
Return procedure for SN74LVC125ADTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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