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Texas Instruments SN74LVC125ADE4
- Part No.:
- SN74LVC125ADE4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC125ADE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,460
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Product details
Overview
SN74LVC125ADE4 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, accepts 5.5V-tolerant inputs, delivers ≤4.8ns propagation delay at 3.3V, and supports industrial temperature range (–40°C to 125°C). It is used in telecom baseband units and optical networking interfaces where signal integrity and voltage compatibility are critical.
For engineers reviewing the SN74LVC125ADE4 datasheet, SN74LVC125ADE4 pinout, SN74LVC125ADE4 application, or SN74LVC125ADE4 equivalent, key selection criteria include 3-state output control per channel, 5.5V input tolerance enabling 3.3V/5V system interfacing, guaranteed tpd ≤4.8ns at 3.3V, thermal performance (RθJA = 127.8°C/W in SOIC-14), and compliance with JESD 17 latch-up >250mA.
Technical Context
The SN74LVC125ADE4 implements four independent CMOS buffer gates, each with dedicated output-enable (OE) control and noninverting A→Y logic path. Its 3-state outputs support bidirectional bus sharing, while 5.5V-tolerant inputs allow direct connection to legacy 5V logic without external level shifters.
It features balanced drive strength (±24mA at 3V), low dynamic power consumption (Cpd = 15pF at 3.3V), and robust ESD protection (±2000V HBM). The device requires OE tied high via pullup resistor during power-up/down to ensure fail-safe high-impedance state - a critical requirement in hot-swap and partial-power-down systems.
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 - allows direct interface with 5V logic without external translators or clamping diodes |
| Max Propagation Delay | 4.8ns at VCC = 3.3V - supports >100MHz data rates in buffered address/data paths |
| Output Drive Strength | ±24mA at VCC = 3V - sufficient to drive 50Ω transmission lines or multiple LVC loads |
| Operating Temperature | –40°C to 125°C - qualified for telecom infrastructure, remote radio units, and industrial control environments |
| Latch-up Immunity | >250mA per JESD 17 - ensures reliability in noisy power domains with transient coupling |
| ESD Rating | ±2000V HBM - meets IEC 61000-4-2 Level 3 requirements for board-level robustness |
Pinout & Package
SN74LVC125ADE4 is packaged in a 14-pin SOIC (D) package measuring 8.6 mm × 6 mm, with body size 8.65 mm × 3.91 mm. It features gull-wing leads, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Input | Active-low enable control per buffer; high = high-Z output, low = pass-through A→Y |
| 1A–4A | Input | Buffer input signals; tolerant to 5.5V regardless of VCC |
| 1Y–4Y | Output | Noninverting buffered outputs with 3-state capability; driven only when OE = low |
| GND (Pin 7) | Power | Ground reference for all logic and output stages; must be low-inductance connection |
| VCC (Pin 14) | Power | Primary supply rail (1.65–3.6V); requires local 0.1μF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective bus segment isolation without affecting other channels - essential for multi-drop memory or peripheral buses |
| 5.5V-tolerant inputs | Eliminates need for external level-shifting components when interfacing with 5V microcontrollers or legacy peripherals |
| Low ground bounce (VOLP < 0.8V) | Reduces noise coupling into shared ground planes, improving signal integrity in dense PCB layouts |
| High-impedance power-up default | Ensures safe bus states during power sequencing - prevents contention when VCC ramps before control logic stabilizes |
| Wide temperature qualification | Validated from –40°C to 125°C - suitable for deployment in outdoor telecom shelters and base station RF modules |
Applications
| Telecom Baseband Unit | Optical Networking Interface |
|---|---|
|
Use Scenario: Isolating and buffering parallel data/address lines between FPGA and ADC/DAC in 5G baseband processing boards. IC Role / Device Role / Timing Role: Noninverting 3-state bus buffer providing voltage translation and contention-free bus arbitration. Use Value: Enables reliable 3.3V FPGA-to-2.5V analog subsystem communication while maintaining <4.8ns timing margin for 100+ MHz sampling clocks. |
Use Scenario: Driving parallel control signals (e.g., laser bias, monitor photodiode readout) in EPON OLT line cards. IC Role / Device Role / Timing Role: Level-translating buffer isolating 3.3V management MCU from 5V analog front-end circuitry. Use Value: Eliminates discrete level shifters, reduces BOM count, and maintains signal fidelity across 10+ cm trace lengths on high-density optical module PCBs. |
| Remote Radio Unit (RRU) | Industrial Power Monitoring Unit |
|
Use Scenario: Buffering SPI configuration lines between baseband processor and RF transceiver ICs in tower-mounted RRUs. IC Role / Device Role / Timing Role: Low-skew, 3-state-capable buffer ensuring clean clock/data edges under wide ambient temperature swings. Use Value: Guarantees setup/hold timing margins over –40°C to 125°C, preventing SPI command corruption during thermal cycling. |
Use Scenario: Interfacing isolated sensor ADCs (5V domain) with 3.3V microcontroller in telecom power distribution units (PDUs). IC Role / Device Role / Timing Role: Voltage-tolerant bus buffer enabling direct connection without level-shifter ICs or resistive dividers. Use Value: Reduces component count and layout area while maintaining ±24mA drive capability for driving long traces to remote current sensors. |
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 (tape-and-reel vs. tube) and marking (LVC125A vs. LVC125A) | Identical functional use; optimized for automated SMT assembly rather than manual prototyping | Select SN74LVC125ADR for volume production with pick-and-place equipment; SN74LVC125ADE4 suits lab evaluation and low-volume builds. |
| 74LVC125PW,118 (Nexperia) | Pin-compatible but rated only to 85°C; RθJA = 150.8°C/W (vs. TI's 127.8°C/W); lower IOH/IOL drive at 3V (±24mA vs. ±24mA - same) | Suitable for commercial-grade indoor equipment; not qualified for extended-temperature telecom deployments | Use 74LVC125PW,118 only where ambient temperature remains ≤85°C and thermal headroom permits higher junction rise. |
Compared with SN74LVC125ADR, SN74LVC125ADE4 offers identical functionality in tube packaging for easier hand-soldering and bench testing; compared with 74LVC125PW,118, it provides superior thermal performance and extended temperature qualification critical for outdoor telecom hardware.
Availability
SN74LVC125ADE4 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 long product lifecycles.
Supply support for SN74LVC125ADE4 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, with decades of experience in high-reliability industrial and communications ICs.
The SN74LVC125A belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for interoperability across 1.65V–5.5V systems and optimized for low-power, high-speed bus interfacing in telecom, networking, and industrial control applications.
FAQ
What is the maximum operating voltage for SN74LVC125ADE4 inputs?
The SN74LVC125ADE4 inputs tolerate up to 5.5V regardless of VCC level, enabling direct connection to 5V logic families without external level-shifting components. This specification is explicitly guaranteed in the Recommended Operating Conditions table (Section 5.3) and verified across the full temperature range (–40°C to 125°C). The SN74LVC125ADE4 maintains this tolerance while operating from 1.65V to 3.6V on VCC.
Does SN74LVC125ADE4 support hot-swap or partial power-down scenarios?
Yes - the SN74LVC125ADE4 supports safe operation during power transitions when OE pins are pulled high via external resistors. TI recommends tying each OE to VCC through a pullup resistor to guarantee high-impedance outputs during power-up/down. This behavior is documented in Section 3 (Description) and Figure 4-1 pin configuration, making SN74LVC125ADE4 suitable for hot-pluggable modules and systems with staggered power sequencing.
What is the thermal resistance (RθJA) of SN74LVC125ADE4 in its SOIC-14 package?
The SN74LVC125ADE4 in the SOIC-14 (D) package has a junction-to-ambient thermal resistance (RθJA) of 127.8°C/W, as specified in Section 5.4 (Thermal Information) of the datasheet. This value applies to standard JEDEC High-K test board conditions and is critical for calculating maximum allowable power dissipation in thermally constrained telecom enclosures or sealed outdoor housings.
Can SN74LVC125ADE4 replace older 74LS or 74HC logic in existing designs?
SN74LVC125ADE4 can replace 74LS125 and 74HC125 in many cases due to identical pinout and function, but requires validation of VCC compatibility (1.65–3.6V only) and 5.5V input tolerance. Unlike 74HC, it does not operate at 5V VCC; unlike 74LS, it lacks TTL input thresholds. Designers must verify logic thresholds, drive strength, and timing margins - SN74LVC125ADE4 is not a drop-in replacement without schematic review.
Is SN74LVC125ADE4 qualified for automotive applications?
No - SN74LVC125ADE4 is specified for industrial temperature range (–40°C to 125°C) and is not AEC-Q100 qualified. While its operating range overlaps with some automotive grades, TI does not certify or characterize SN74LVC125ADE4 for automotive use. For automotive applications, designers should select TI's automotive-qualified alternatives such as SN74LVC125AQDRQ1, which includes AEC-Q100 testing and enhanced reliability screening.
SN74LVC125ADE4 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
SN74LVC125ADE4 FAQ
1.How can I place an order for SN74LVC125ADE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125ADE4 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 SN74LVC125ADE4 reliable?
The price and inventory of SN74LVC125ADE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125ADE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC125ADE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125ADE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125ADE4?
SN74LVC125ADE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125ADE4 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 SN74LVC125ADE4?
For technical support, including SN74LVC125ADE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125ADE4 requirements.
6.How does Aetrix verify that SN74LVC125ADE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC125ADE4 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 SN74LVC125ADE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC125ADE4?
All SN74LVC125ADE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125ADE4, 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 SN74LVC125ADE4 part is unused and in its original packaging.
Return procedure for SN74LVC125ADE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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