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Texas Instruments SN74LVC125APWTG4
- Part No.:
- SN74LVC125APWTG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC125APWTG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,171
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Product details
Overview
SN74LVC125APWTG4 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 SN74LVC125APWTG4 datasheet, SN74LVC125APWTG4 pinout, SN74LVC125APWTG4 application, or SN74LVC125APWTG4 equivalent, key selection criteria include 3-state output control per channel, 5.5V input tolerance enabling 3.3V/5V interfacing, low ground bounce (<0.8V), and TSSOP-14 package suitability for high-density PCB layouts.
Technical Context
The SN74LVC125APWTG4 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 sharing without contention.
Its CMOS design supports rail-to-rail input logic thresholds, 5.5V-tolerant inputs regardless of VCC, and robust ESD protection (±2000V HBM). The device features controlled output drive strength (±24mA at 3V), low power dissipation (1μA typical ICC), and specified switching performance across –40°C to 125°C.
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 logic domains without level shifters. |
| Input Voltage Tolerance | Up 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 - ensures timing compliance in high-speed data paths up to ~100MHz clock-equivalent rates. |
| Output Drive Strength | ±24mA at VCC = 3V - sufficient to drive standard 50Ω transmission lines or multiple CMOS loads without external buffering. |
| Operating Temperature | –40°C to 125°C - qualified for deployment in telecom shelters, remote radio units, and industrial baseband equipment. |
| ESD Rating | ±2000V HBM - meets JEDEC JS-001 requirements for robust handling in automated assembly and field environments. |
| Power Dissipation | 500mW max (TA ≤ 125°C) - supports continuous operation in thermally constrained TSSOP-14 packages with appropriate board layout. |
Pinout & Package
TSSOP-14 (PW) package: 5.00mm × 6.4mm body, 0.65mm lead pitch, exposed thermal pad not present, RoHS-compliant NiPdAu lead 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 pullup for power-up safety. |
| 1A–4A | Buffer input | Noninverting data input for each channel; accepts 0–5.5V regardless of VCC. |
| 1Y–4Y | Buffer output | 3-state output driven by A when OE is low; high-impedance when OE is high. |
| VCC (Pin 14) | Positive supply | Single supply rail for all logic and output stages; bypass with 0.1μF capacitor near pin. |
| GND (Pin 7) | Ground reference | Common return path for all I/O and internal circuitry; connect to low-impedance ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective bus arbitration and multi-drop line sharing without external logic or timing constraints. |
| 5.5V-tolerant inputs on all A pins | Eliminates need for discrete level translators when interfacing 5V sensors or legacy controllers to 3.3V systems. |
| Low ground bounce (VOLP < 0.8V @ 3.3V) | Maintains signal integrity during simultaneous switching, reducing noise coupling into analog or RF sections. |
| Specified operation to 125°C | Validates use in enclosed telecom enclosures and outdoor wireless infrastructure without derating. |
| High noise immunity (VIH/VIL thresholds scale with VCC) | Ensures reliable logic detection across voltage and temperature variations, minimizing false triggering. |
Applications
| Telecom Baseband Units | Optical Networking Interfaces |
|---|---|
Use Scenario: Signal routing between FPGA I/O banks and high-speed DACs/ADCs in CPRI/JESD204B-capable baseband processing cards. IC Role / Device Role / Timing Role: Bus buffer isolating voltage domains and enabling hot-swap-safe 3-state control during reconfiguration. Use Value: Prevents bus contention during partial reconfiguration and supports 5.5V-tolerant control signals from monitoring microcontrollers. |
Use Scenario: Interfacing SFP+ module control lines (I²C, GPIO) to host processor in EPON OLT line cards. IC Role / Device Role / Timing Role: Level-translating buffer for bidirectional management buses operating across 3.3V host and 5V module domains. Use Value: Eliminates external level shifters while maintaining timing margins due to sub-5ns tpd and controlled edge rates. |
| Remote Radio Units (RRU) | Industrial Power Monitoring Units |
Use Scenario: Isolating FPGA configuration JTAG and SPI lines from RF front-end ASICs in tower-mounted amplifiers. IC Role / Device Role / Timing Role: 3-state gate enabling shared debug/test access without signal loading or crosstalk. Use Value: Reduces BOM count versus discrete MOSFET switches and avoids latch-up risk from mixed-voltage probing. |
Use Scenario: Buffering isolated analog sensor outputs (current/voltage sense) to isolated MCU ADC inputs in telecom PDUs. IC Role / Device Role / Timing Role: Digital interface conditioner for opto-isolated digital control signals entering the main controller domain. Use Value: Provides clean, glitch-free enable/disable of monitoring functions with guaranteed high-Z during power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APWRG4 | TSSOP-14, 2000-piece tape-and-reel vs. 250-piece small reel; identical electrical specs and marking. | Same functional use; preferred for high-volume production runs requiring automated placement efficiency. | Select SN74LVC125APWRG4 for volume manufacturing; SN74LVC125APWTG4 suits prototyping and low-MOQ builds. |
| 74LVC125ADTR2G (onsemi) | SOIC-14 package, ±2000V HBM, 1.65–3.6V operation, but no 5.5V input tolerance - max VI = VCC + 0.3V. | Limited to same-supply-domain buffering; cannot replace SN74LVC125APWTG4 in mixed 3.3V/5V systems. | Use only where all connected devices share VCC; verify input voltage limits before substitution. |
Compared with SN74LVC125APWRG4, SN74LVC125APWTG4 offers identical performance in a smaller reel format ideal for evaluation and pilot builds; compared with 74LVC125ADTR2G, it uniquely supports 5.5V-tolerant inputs - a critical differentiator for legacy interface bridging.
Availability
SN74LVC125APWTG4 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 SN74LVC125APWTG4 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 SN74LVC125APWTG4 belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-signal interface applications in telecom infrastructure, enterprise networking, and industrial automation systems.
FAQ
What is the maximum input voltage rating for SN74LVC125APWTG4?
The SN74LVC125APWTG4 supports input voltages up to 5.5V on all A pins, independent of VCC level - a key feature enabling interoperability between 3.3V logic and 5V peripherals without external level shifters. This rating is absolute and applies across the full operating temperature range (–40°C to 125°C).
Does SN74LVC125APWTG4 require external pull-up resistors on 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 via an external pull-up resistor. The minimum resistance value depends on the current-sourcing capability of the driving source; TI recommends verifying against the driver's IOH spec under worst-case conditions.
Can SN74LVC125APWTG4 be used in a 1.8V system?
Yes - SN74LVC125APWTG4 is fully specified from 1.65V to 3.6V, including 1.8V operation. At 1.8V, it delivers tpd ≤ 11.8ns and supports VIH/VIL thresholds scaled to VCC, ensuring reliable logic detection and noise margin in low-voltage FPGA or ASIC interfaces.
What is the thermal resistance (RθJA) of the SN74LVC125APWTG4 package?
The SN74LVC125APWTG4 uses a TSSOP-14 (PW) package with a junction-to-ambient thermal resistance (RθJA) of 150.8°C/W, measured under JEDEC JESD51-2 conditions. This value assumes standard 2-layer board layout with minimal copper; adding thermal vias and ground planes can significantly improve actual thermal performance.
Is SN74LVC125APWTG4 pin-compatible with other LVC125 variants?
Yes - SN74LVC125APWTG4 shares identical pinout and function mapping with all SN74LVC125x variants in TSSOP-14 (PW) packaging, including SN74LVC125APWRG4 and SN74LVC125APWE4. Differences are limited to reel size, packaging date code, and minor process enhancements - no PCB redesign is required for substitution within the same package type.
SN74LVC125APWTG4 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
SN74LVC125APWTG4 FAQ
1.How can I place an order for SN74LVC125APWTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125APWTG4 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 SN74LVC125APWTG4 reliable?
The price and inventory of SN74LVC125APWTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125APWTG4 is usually 5 days.
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4.How is shipping managed for SN74LVC125APWTG4?
SN74LVC125APWTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125APWTG4 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 SN74LVC125APWTG4?
For technical support, including SN74LVC125APWTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125APWTG4 requirements.
6.How does Aetrix verify that SN74LVC125APWTG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC125APWTG4 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 SN74LVC125APWTG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC125APWTG4?
All SN74LVC125APWTG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125APWTG4, 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 SN74LVC125APWTG4 part is unused and in its original packaging.
Return procedure for SN74LVC125APWTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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