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Texas Instruments SN74LVC125APWRE4
- Part No.:
- SN74LVC125APWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC125APWRE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:919
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Product details
Overview
SN74LVC125APWRE4 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. It enables bidirectional signal routing in telecom baseband units and optical networking interfaces.
For engineers reviewing the SN74LVC125APWRE4 datasheet, SN74LVC125APWRE4 pinout, SN74LVC125APWRE4 application, or SN74LVC125APWRE4 equivalent, key selection criteria include 3-state output control per channel, VI tolerance up to 5.5V, guaranteed tpd ≤6.0ns over full temperature range, and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC125APWRE4 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 contention avoidance in shared-data-path architectures.
Its CMOS input structure accepts 5.5V logic levels regardless of VCC (1.65–3.6V), allowing seamless interfacing between legacy 5V peripherals and modern 3.3V/2.5V subsystems. Output drive strength scales with supply voltage: ±24mA at 3.0V, ±12mA at 2.7V, supporting TTL- and LVTTL-compatible loads without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - enables direct integration into 1.8V, 2.5V, and 3.3V power domains without level-shifter circuitry |
| Input Voltage Tolerance | Up to 5.5V - permits connection to 5V logic without clamping diodes or external protection |
| tpd (max) | 6.0ns at 3.3V, –40°C to 125°C - ensures sub-10ns timing margin for 100MHz bus clocking |
| IOL/IOH | ±24mA at VCC = 3.0V - drives 15-pF loads with <1ns edge rates while maintaining VOL ≤0.55V and VOH ≥2.3V |
| Operating Temperature | –40°C to 125°C - qualified for industrial and telecom infrastructure environments including remote radio units and power distribution units |
| ESD Rating | ±2000V HBM - meets JEDEC JS-001 requirements for robust handling in automated assembly lines |
Pinout & Package
TSSOP-14 (PW) package: 5.00mm × 6.4mm body, 0.65mm lead pitch, exposed thermal pad optional, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Independent per-channel control; high = high-Z output; requires pull-up to VCC during power sequencing |
| 1A–4A | Buffer input | CMOS-compatible inputs tolerant to 5.5V regardless of VCC; no external clamping needed |
| 1Y–4Y | Buffer output | 3-state noninverting outputs; capable of sourcing/sinking ±24mA at 3.0V with rail-to-rail swing |
| VCC (Pin 14) | Positive supply | Single supply for all four channels; bypass capacitor (0.1μF) required adjacent to pin |
| GND (Pin 7) | Ground reference | Common return for all I/O and supply currents; must connect to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| 5.5V-tolerant inputs | Enables direct interface with 5V microcontrollers or FPGAs without external level shifters in mixed-supply systems |
| Per-channel 3-state control | Allows selective bus arbitration across four independent data paths - critical for multi-drop memory or peripheral buses |
| Low ground bounce (VOLP < 0.8V) | Reduces noise coupling into analog sections and improves signal integrity in high-speed digital/analog co-location |
| High-impedance power-up default | OE tied to VCC via pull-up ensures outputs remain disabled until firmware initializes control logic |
| Latch-up immunity >250mA | Meets JESD17 Class II requirements - prevents destructive latch-up during hot-swap or transient overvoltage events |
Applications
| Telecom Baseband Units | Optical Networking Interfaces |
|---|---|
|
Use Scenario: Signal conditioning between FPGA I/O banks (3.3V) and legacy 5V line cards in LTE/5G baseband processing modules. IC Role / Device Role / Timing Role: Bidirectional voltage-level translator and bus isolator with per-lane enable control. Use Value: Eliminates need for discrete MOSFET translators; reduces BOM count by 4× and layout area by >30% versus dual-channel alternatives. |
Use Scenario: Driving parallel LVDS or CML serializer inputs in EPON OLT line cards where 5V PHYs interface with 3.3V MAC processors. IC Role / Device Role / Timing Role: Low-skew, 3-state buffer providing clean signal launch into high-capacitance backplane traces. Use Value: Achieves <6ns max tpd variation across all four lanes - maintains inter-lane skew <1ns for deterministic SERDES alignment. |
| Remote Radio Units (RRU) | Power Distribution Units (PDU) |
|
Use Scenario: Isolating control signals between DSP (2.5V) and RF front-end ASICs (3.3V) in tower-mounted amplifiers subject to wide ambient temperature swings. IC Role / Device Role / Timing Role: Temperature-stable bus buffer ensuring reliable GPIO handshaking from –40°C to +125°C. Use Value: Guaranteed operation at 125°C eliminates derating concerns in sealed RF enclosures; supports extended product lifetime beyond 10 years. |
Use Scenario: Enabling/disabling monitoring signals (voltage, current, temperature) from multiple DC/DC modules to a central MCU in telecom shelter PDUs. IC Role / Device Role / Timing Role: Multiplexed sensor data aggregator with independent enable per channel to minimize standby current. Use Value: Reduces system idle current by 85% versus always-on buffers; ICC < 40μA at 3.6V ensures >10-year battery backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126APWRE4 | Inverting output logic (A→¬Y); identical VCC, speed, and packaging | Requires logic inversion in upstream/downstream design; unsuitable where signal polarity must be preserved | Select only when system-level timing or logic equations require inverted outputs - otherwise use SN74LVC125APWRE4 for direct signal pass-through |
| 74LVC125ADTR2G | SOIC-14 package (8.6mm × 6mm); same electrical specs but larger footprint and higher RθJA (127.8°C/W vs 150.8°C/W) | Preferred for prototyping or low-volume manual assembly; not suitable for space-constrained telecom modules | Choose SN74LVC125APWRE4 for production-grade density and thermal performance in TSSOP-based designs; use SOIC variant only for first-article validation |
Compared with SN74LVC126APWRE4 and 74LVC125ADTR2G, the SN74LVC125APWRE4 provides noninverting signal integrity in the smallest industrial-grade package, delivering optimal trade-off between board area, thermal resistance, and logic fidelity for high-reliability telecom infrastructure.
Availability
SN74LVC125APWRE4 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 production lifecycles.
Supply support for SN74LVC125APWRE4 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVC125A belongs to TI's LVC logic family - engineered for low-voltage operation, high noise immunity, and interoperability across mixed-supply systems in telecom infrastructure and enterprise networking equipment.
FAQ
What is the maximum input voltage rating for SN74LVC125APWRE4?
The SN74LVC125APWRE4 supports input voltages up to 5.5V across its entire operating VCC range (1.65V–3.6V). This 5.5V tolerance is absolute - no external clamping or current limiting is required when interfacing with 5V logic sources, making it ideal for legacy system upgrades and mixed-voltage board designs.
Does SN74LVC125APWRE4 support hot-swap operation?
Yes, SN74LVC125APWRE4 supports hot-swap operation due to its high latch-up immunity (>250mA per JESD17) and robust ESD protection (±2000V HBM). Its 3-state outputs can be safely enabled/disabled while VCC is stable, and the device remains functional during partial power sequencing - critical for modular telecom shelf systems.
What is the recommended bypass capacitor for SN74LVC125APWRE4?
A 0.1μF ceramic capacitor placed as close as possible to the VCC pin (Pin 14) is the minimum recommended bypass. For improved high-frequency noise suppression in dense layouts, TI recommends paralleling a 0.01μF capacitor near each VCC connection point - though SN74LVC125APWRE4 has only one VCC pin, so a single 0.1μF placement suffices.
Can SN74LVC125APWRE4 drive a 50Ω transmission line directly?
No - SN74LVC125APWRE4 is not designed for 50Ω line driving. Its output drive strength (±24mA at 3.0V) targets capacitive loads ≤50pF and resistive loads ≥100Ω. For 50Ω transmission lines, use a dedicated line driver IC or add series termination (e.g., 33Ω resistor) to match impedance and suppress reflections.
How does SN74LVC125APWRE4 handle power-up sequencing?
SN74LVC125APWRE4 enters a high-impedance state on power-up if OE pins are tied to VCC via a pull-up resistor. TI specifies this configuration ensures outputs remain disabled until firmware asserts valid OE control - preventing bus contention during boot. The minimum pull-up value depends on the driver's current-sourcing capability, typically ≥10kΩ.
SN74LVC125APWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm 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-TSSOP
SN74LVC125APWRE4 FAQ
1.How can I place an order for SN74LVC125APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125APWRE4 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 SN74LVC125APWRE4 reliable?
The price and inventory of SN74LVC125APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125APWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC125APWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125APWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125APWRE4?
SN74LVC125APWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125APWRE4 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 SN74LVC125APWRE4?
For technical support, including SN74LVC125APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125APWRE4 requirements.
6.How does Aetrix verify that SN74LVC125APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC125APWRE4 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 SN74LVC125APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC125APWRE4?
All SN74LVC125APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125APWRE4, 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 SN74LVC125APWRE4 part is unused and in its original packaging.
Return procedure for SN74LVC125APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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