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Texas Instruments SN74LVC125APWR
- Part No.:
- SN74LVC125APWR
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC125APWR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:83,890
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Product details
Overview
SN74LVC125APWR 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 SN74LVC125APWR datasheet, SN74LVC125APWR pinout, SN74LVC125APWR application, or SN74LVC125APWR equivalent, key selection criteria include 3-state output control per channel, independent OE inputs, VI tolerance up to 5.5V, thermal performance (RθJA = 150.8°C/W), and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC125APWR implements four independent noninverting buffers, each with dedicated output-enable (OE) logic that places its Y output in high-impedance when asserted high. Its CMOS design ensures balanced drive strength (±24mA at 3V) and low dynamic power consumption (Cpd = 15pF at 3.3V).
Input overvoltage tolerance enables seamless interfacing between 3.3V logic domains and legacy 5V peripherals without external level shifters. The device's latch-up immunity (>250mA per JESD17) and ESD robustness (±2000V HBM) support reliable deployment in telecom infrastructure with noisy power rails and hot-swap events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - enables single-supply operation across LVC-family voltage domains including 1.8V, 2.5V, and 3.3V systems. |
| Input Voltage Max | 5.5V - allows direct connection to 5V TTL/CMOS outputs without clamping diodes or external resistors. |
| tpd (Max) | 4.8ns at VCC = 3.3V - supports >100MHz data rates in buffered address/data bus applications. |
| IOH/IOL | ±24mA at VCC = 3V - drives standard 50Ω transmission lines or multiple CMOS loads without fanout limitation. |
| Operating Temp | –40°C to 125°C - qualified for industrial and telecom base station environments with extended thermal cycling. |
| RθJA | 150.8°C/W (TSSOP-14) - defines maximum power dissipation (≤3.3mW) before junction exceeds 125°C at 25°C ambient. |
Pinout & Package
TSSOP-14 (PW) package: 5.00mm × 6.4mm body, 0.65mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Input | Active-low enable controls individual buffer output state; high = high-Z, low = pass-through A→Y. |
| 1A–4A | Input | Buffer input signals; tolerant to 5.5V regardless of VCC, enabling mixed-voltage signal routing. |
| 1Y–4Y | Output | Noninverting buffered outputs with 3-state capability; driven only when corresponding OE is low. |
| VCC (Pin 14) | Power | Single positive supply for all four buffers; requires local 0.1μF bypass capacitor per TI layout guidelines. |
| GND (Pin 7) | Ground | Common reference for all I/O and internal logic; must be connected to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control | Four separate OE inputs allow selective bus segment isolation without affecting other channels. |
| 5.5V-tolerant inputs | Eliminates need for external level translators when interfacing with 5V microcontrollers or legacy peripherals. |
| Low propagation delay | 4.8ns max at 3.3V enables timing-critical applications such as DDR address buffering and FPGA I/O expansion. |
| High noise immunity | VIL = 0.8V and VIH = 2.0V at 3.3V provide >1.5V noise margin against rail-to-rail interference. |
| Latch-up immunity | Exceeds 250mA per JESD17 - prevents destructive failure during transient overcurrent events in telecom power domains. |
Applications
| Telecom Baseband Units | Optical Networking Line Cards |
|---|---|
Use Scenario: Buffering parallel control signals between FPGA and RF transceiver ICs in LTE/5G baseband processing modules. IC Role / Device Role / Timing Role: Signal integrity-preserving bus isolator with per-channel 3-state control for dynamic resource allocation. Use Value: Prevents bus contention during partial reconfiguration while maintaining <4.8ns timing alignment across four independent control paths. |
Use Scenario: Interfacing 3.3V SERDES controllers with 5V analog monitoring circuits in EPON OLT line cards. IC Role / Device Role / Timing Role: Voltage-level translator and bus driver with 5.5V-tolerant inputs and fast edge control. Use Value: Enables direct connection without external resistive dividers, reducing BOM count and preserving signal rise time (<2.5ns/V). |
| Industrial PLC I/O Modules | Test Equipment Backplanes |
Use Scenario: Isolating digital I/O expansion buses between main controller and modular sensor/actuator carriers. IC Role / Device Role / Timing Role: Hot-swap-safe bus buffer with high-impedance default state during power sequencing. Use Value: OE pins tied to VCC via pullup ensure safe high-Z startup, preventing backdrive into unpowered downstream logic. |
Use Scenario: Driving multiple instrument slots on a PXI-style backplane with synchronized trigger and clock distribution. IC Role / Device Role / Timing Role: Low-skew, low-capacitance repeater for TTL-compatible control signals across long traces. Use Value: Cpd = 15pF at 3.3V minimizes loading on shared backplane nets, supporting stable operation at 100MHz+ toggle rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APW | Same silicon, identical electrical specs, but supplied in tube packaging (90 pcs) vs. tape-and-reel (2000 pcs). | No functional difference; suitable for prototyping or low-volume builds where reel handling is unnecessary. | Select SN74LVC125APW for bench evaluation; SN74LVC125APWR preferred for automated SMT production. |
| 74LVC125AD | SOIC-14 package (8.6mm × 6mm), higher RθJA (127.8°C/W), same logic function and voltage specs. | Better thermal margin in low-airflow enclosures; larger footprint limits high-density routing in compact telecom modules. | Choose 74LVC125AD when board space permits and thermal derating above 70°C is required. |
Compared with SN74LVC125APW and 74LVC125AD, the SN74LVC125APWR offers optimal balance of small-footprint TSSOP packaging, production-ready tape-and-reel delivery, and verified 125°C operation - making it the preferred choice for volume-manufactured telecom and industrial control hardware.
Availability
SN74LVC125APWR is available at Aetrix Electronics and suitable for telecom baseband units, optical networking line cards, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74LVC125APWR 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 logic solutions with decades of automotive and industrial qualification expertise.
The SN74LVC125A family was developed to address voltage translation and bus isolation needs in high-speed digital systems operating across 1.65V–3.6V rails, particularly targeting telecom infrastructure and industrial automation.
FAQ
What is the maximum input voltage rating for SN74LVC125APWR?
The SN74LVC125APWR supports input voltages up to 5.5V regardless of VCC level, enabling direct interface with 5V logic families without external protection. This overvoltage tolerance is guaranteed across the full operating temperature range (–40°C to 125°C) and applies to all A-input pins (1A–4A). The specification is validated per TI's absolute maximum ratings table and confirmed in Section 5.1 of the official datasheet SCAS290T.
Does SN74LVC125APWR support hot-swap operation?
Yes, SN74LVC125APWR supports controlled hot-swap behavior when OE pins are pulled high via external resistors during power-up. TI recommends tying each OE to VCC through a pullup resistor sized per the driver's current-sinking capability to ensure outputs remain in high-impedance until VCC stabilizes. This prevents backdrive into unpowered downstream circuitry - a critical requirement in modular telecom and test equipment designs using the SN74LVC125APWR.
What is the thermal resistance (RθJA) of SN74LVC125APWR in its native package?
The SN74LVC125APWR in TSSOP-14 (PW) package has a junction-to-ambient thermal resistance of 150.8°C/W, as specified in Section 5.4 of the datasheet. This value assumes standard JEDEC 2-layer board conditions and directly determines allowable power dissipation: at 25°C ambient, maximum continuous power is ~3.3mW before junction temperature reaches 125°C. Layout practices such as copper pour under the package and optimized trace width further improve thermal performance in real-world SN74LVC125APWR implementations.
Can SN74LVC125APWR be used as a level shifter between 3.3V and 5V domains?
Yes, SN74LVC125APWR functions as a unidirectional level shifter from 5V inputs to 3.3V-compatible outputs. Its 5.5V-tolerant inputs accept 5V logic highs while operating from a 3.3V VCC, and its outputs swing rail-to-rail (0V to 3.3V) with sufficient drive strength (±24mA) to meet 3.3V CMOS input thresholds. This eliminates external components in mixed-voltage systems - a documented use case in TI's SN74LVC125A application schematic (Figure 8-1) and explicitly supported by the SN74LVC125APWR's VIH/VIL specifications at 3.3V.
What are the recommended bypass capacitor values for SN74LVC125APWR?
Texas Instruments specifies a 0.1μF ceramic capacitor placed as close as possible to the VCC pin (Pin 14) of the SN74LVC125APWR, with short, low-inductance connections to GND (Pin 7). For boards with multiple VCC pins or high-noise environments, paralleling a 1μF capacitor is acceptable to suppress lower-frequency ripple. These recommendations appear in Section 8.2 of the SN74LVC125APWR datasheet and are validated for stable operation across the full 1.65V–3.6V supply range and –40°C to 125°C temperature span.
SN74LVC125APWR 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
SN74LVC125APWR FAQ
1.How can I place an order for SN74LVC125APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125APWR 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 SN74LVC125APWR reliable?
The price and inventory of SN74LVC125APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125APWR is usually 5 days.
3.What payment methods are accepted for SN74LVC125APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC125APWR?
SN74LVC125APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125APWR 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 SN74LVC125APWR?
For technical support, including SN74LVC125APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125APWR requirements.
6.How does Aetrix verify that SN74LVC125APWR is sourced from the original manufacturer or authorized distributors?
All SN74LVC125APWR 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 SN74LVC125APWR meets industry standards.
7.What is the process for return or replacement of SN74LVC125APWR?
All SN74LVC125APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125APWR, 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 SN74LVC125APWR part is unused and in its original packaging.
Return procedure for SN74LVC125APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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