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Texas Instruments SN74LVC125APWT
- Part No.:
- SN74LVC125APWT
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC125APWT.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,226
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Product details
Overview
SN74LVC125APWT 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 SN74LVC125APWT datasheet, SN74LVC125APWT pinout, SN74LVC125APWT application, or SN74LVC125APWT equivalent, key selection criteria include 3-state output control per channel, 5.5V input tolerance enabling 3.3V/5V system interfacing, low ground bounce (<0.8V), and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC125APWT implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Each buffer passes A→Y when OE is low and enters high-impedance state when OE is high - enabling bidirectional bus arbitration and dynamic load isolation.
Its CMOS design supports rail-to-rail output swing (VOH ≥ VCC–0.2V, VOL ≤ 0.3V), exhibits latch-up immunity >250mA (JESD17), and features input transition rate tolerance up to 8 ns/V. The device requires no external biasing beyond standard VCC/GND and pull-up on OE for power-up safety.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65V to 3.6V - enables direct integration into 1.8V, 2.5V, and 3.3V logic domains without level shifters. |
| Input Voltage Range | 0V to 5.5V - allows safe interfacing with legacy 5V peripherals while powered from 3.3V or lower. |
| Max Propagation Delay | 4.8ns at 3.3V - supports >100MHz data rates in point-to-point digital links. |
| Output Drive Strength | ±24mA at 3.0V - sufficient to drive 50Ω transmission lines or multiple CMOS loads without buffering. |
| Operating Temperature | –40°C to 125°C - qualified for telecom shelter, remote radio unit (RRU), and industrial embedded environments. |
| ESD Rating (HBM) | ±2000V - meets IEC 61000-4-2 Level 2 requirements for board-level robustness. |
| Power Dissipation Cap | 500mW at TA ≤125°C - supports continuous operation in thermally constrained TSSOP-14 packages. |
Pinout & Package
TSSOP-14 (PW) package: 5.00mm × 6.4mm body, 0.65mm lead pitch, exposed pad optional, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable input | Individually disables corresponding Y output into high-Z; tie to VCC via pull-up for power-safe default state. |
| 1A–4A | Buffer input | Noninverting data input per channel; 5.5V-tolerant regardless of VCC. |
| 1Y–4Y | Buffer output | 3-state CMOS output; drives high/low or floats based on OE; supports bus sharing. |
| VCC | Positive supply | Single supply pin for all four buffers; requires local 0.1μF bypass capacitor. |
| GND | Ground reference | Common return path; must be low-impedance for noise control and ground bounce suppression. |
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 at any VCC ≥1.65V | Eliminates need for external level translators when connecting 5V sensors or legacy controllers to 3.3V SoCs. |
| Low ground bounce (VOLP < 0.8V @ 3.3V) | Maintains signal integrity during simultaneous switching; reduces risk of false logic transitions in adjacent circuits. |
| Latch-up immunity >250mA | Ensures survivability under transient overvoltage or ESD events per JESD17 - critical for field-deployed telecom hardware. |
| Wide temperature support (–40°C to 125°C) | Validated for use in outdoor wireless infrastructure including RRUs, RETs, and tower-mounted amplifiers. |
Applications
| Telecom Baseband Unit | Optical Networking Interface |
|---|---|
|
Use Scenario: Signal routing between FPGA-based baseband processor and multiple RF front-end ICs in 5G macro base stations. IC Role / Device Role / Timing Role: Bus buffer isolating control/data lanes during reconfiguration; provides 3-state hold during FPGA partial reconfiguration cycles. Use Value: Prevents bus contention during hot-swap of RF modules; 5.5V input tolerance accommodates mixed-voltage sensor interfaces. |
Use Scenario: Interfacing SFP+ module control lines (I²C, GPIO) to host controller in EPON OLT line cards. IC Role / Device Role / Timing Role: Level-translating buffer between 3.3V host MCU and 5V-tolerant SFP+ management interface. Use Value: Enables direct connection without discrete resistors or translators; 4.8ns tpd preserves timing margin in 100kHz I²C clock domain. |
| Remote Radio Unit (RRU) | Industrial Power Monitoring Unit |
|
Use Scenario: Isolating FPGA configuration bus from analog front-end ASICs in compact RRU enclosures with thermal constraints. IC Role / Device Role / Timing Role: Bidirectional bus gate managing JTAG and SPI configuration paths; OE controlled by FPGA reset state machine. Use Value: High-Z state prevents back-driving during power sequencing; 125°C rating ensures reliability inside sealed RF enclosures. |
Use Scenario: Buffering isolated ADC status signals and relay control outputs in telecom PDU monitoring boards. IC Role / Device Role / Timing Role: Digital interface conditioner between isolated microcontroller and non-isolated power MOSFET drivers. Use Value: 24mA drive strength directly switches optocoupler LEDs; 5.5V input tolerance accepts feedback signals from 5V analog comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126APWT | Inverting output logic (A→¬Y); identical voltage, timing, and packaging specs. | Requires logic inversion in signal path; unsuitable where polarity must be preserved. | Select only if system-level logic requires inversion; otherwise, SN74LVC125APWT maintains signal polarity. |
| 74LVC125PW,118 (Nexperia) | Same functional spec, but rated –40°C to 125°C only in PW package; slightly higher ICC (max 40μA vs TI's 40μA). | Drop-in replacement in TSSOP-14 footprint; validated for same telecom applications per Nexperia documentation. | Valid alternative when dual-sourcing is required; verify layout compatibility with exact pad dimensions and thermal pad presence. |
Compared with SN74LVC125APWT, SN74LVC126APWT changes signal polarity - requiring schematic and firmware updates - while 74LVC125PW,118 offers second-source assurance with identical pinout and performance, easing supply chain risk without design change.
Availability
SN74LVC125APWT is available at Aetrix Electronics and suitable for telecom baseband units, optical networking interfaces, remote radio units, and industrial power monitoring units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC125APWT 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, with decades of heritage in logic and interface ICs.
The SN74LVC125A family was engineered for voltage-flexible bus interfacing in communications infrastructure - prioritizing 5V-tolerant inputs, fast switching, and robust operation across harsh thermal environments.
FAQ
What is the maximum input voltage the SN74LVC125APWT can tolerate?
The SN74LVC125APWT accepts input voltages up to 5.5V regardless of VCC level (1.65V–3.6V), making it ideal for interfacing 5V legacy devices in modern low-voltage systems. This tolerance is specified across the full operating temperature range and does not require external clamping circuitry. The SN74LVC125APWT input structure is designed to safely sink current beyond VCC without damage or logic upset.
Does the SN74LVC125APWT require external pull-up resistors on its OE pins?
Yes - to ensure outputs remain in high-impedance state during power-up or power-down, each OE pin should be tied to VCC through a pull-up resistor. The minimum value depends on the driver's current-sourcing capability; typical values range from 4.7kΩ to 10kΩ. This requirement applies to all four OE inputs independently and is explicitly recommended in the SN74LVC125APWT datasheet Section 3.
Can the SN74LVC125APWT operate reliably at 125°C ambient temperature?
Yes - the SN74LVC125APWT is fully specified and tested for continuous operation from –40°C to +125°C ambient temperature. Thermal metrics (e.g., RθJA = 150.8°C/W for TSSOP-14) and electrical parameters (including tpd, VOH, VOL) are guaranteed across this range. This qualification supports deployment in telecom shelters, RRUs, and other uncooled outdoor infrastructure where SN74LVC125APWT must maintain timing and drive integrity.
What is the propagation delay of the SN74LVC125APWT at 2.5V supply?
At VCC = 2.5V ± 0.2V and TA = 25°C, the SN74LVC125APWT has a typical propagation delay (tpd) of 2.7ns and a maximum of 6.3ns across the –40°C to 85°C range. This delay remains stable under load conditions defined in the TI test setup (CL = 30pF, Δt/Δv = 8ns/V), confirming suitability for sub-100MHz digital control paths in SN74LVC125APWT-based designs.
Is the SN74LVC125APWT pin-compatible with other TSSOP-14 logic buffers?
Yes - the SN74LVC125APWT uses standard JEDEC MO-153 TSSOP-14 mechanical dimensions (5.00mm × 6.4mm, 0.65mm pitch) and matches the pinout of industry-standard quad buffer ICs like 74LVC125 and 74LVCH125. However, functional equivalence (e.g., 3-state behavior, input tolerance) must be verified per datasheet; physical compatibility alone does not guarantee drop-in replacement.
SN74LVC125APWT 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:
- 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-TSSOP
SN74LVC125APWT FAQ
1.How can I place an order for SN74LVC125APWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125APWT 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 SN74LVC125APWT reliable?
The price and inventory of SN74LVC125APWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125APWT is usually 5 days.
3.What payment methods are accepted for SN74LVC125APWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125APWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125APWT?
SN74LVC125APWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125APWT 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 SN74LVC125APWT?
For technical support, including SN74LVC125APWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125APWT requirements.
6.How does Aetrix verify that SN74LVC125APWT is sourced from the original manufacturer or authorized distributors?
All SN74LVC125APWT 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 SN74LVC125APWT meets industry standards.
7.What is the process for return or replacement of SN74LVC125APWT?
All SN74LVC125APWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125APWT, 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 SN74LVC125APWT part is unused and in its original packaging.
Return procedure for SN74LVC125APWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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