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Texas Instruments SN74LVC125ADBR
- Part No.:
- SN74LVC125ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC125ADBR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,860
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Product details
Overview
SN74LVC125ADBR 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 –40°C to 125°C industrial temperature range - enabling use in telecom baseband units and optical networking line cards.
For engineers reviewing the SN74LVC125ADBR datasheet, SN74LVC125ADBR pinout, SN74LVC125ADBR application, or SN74LVC125ADBR equivalent, key selection criteria include 3-state output control per channel, 5.5V input tolerance for 3.3V/5V interfacing, thermal performance in SSOP-14 (RθJA = 140.4°C/W), and latch-up immunity exceeding 250mA per JESD17.
Technical Context
The SN74LVC125ADBR implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Its CMOS design enables bidirectional voltage translation: 5V logic inputs drive 3.3V outputs without external level shifters, while maintaining rail-to-rail output swing (VOH ≥ VCC–0.2V, VOL ≤ 0.3V at IOL = 12mA).
Each buffer features high-impedance state control via OE, with power-up/down robustness ensured by tying OE to VCC through an external pullup resistor. Input transition rate is specified at ≤8 ns/V, and output ground bounce (VOLP) remains <0.8V at 3.3V/25°C - critical for signal integrity in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65V to 3.6V - enables direct integration into 3.3V systems and compatibility with 2.5V/1.8V domains via derated operation. |
| Input Voltage Range | 0V to 5.5V - allows safe interfacing with legacy 5V logic without external clamping or level-shifting circuitry. |
| Propagation Delay | ≤4.8ns at VCC = 3.3V - supports >100MHz data rates in bus buffering applications such as backplane interfaces. |
| Output Drive | ±24mA at VCC = 3.0V - sufficient to drive 50Ω transmission lines or multiple CMOS loads without fanout limitations. |
| Operating Temperature | –40°C to 125°C - qualified for deployment in telecom shelters, remote radio units (RRU), and industrial base stations. |
| Latch-up Immunity | >250mA per JESD17 - ensures robustness against transient current surges in noisy power environments. |
Pinout & Package
SN74LVC125ADBR uses the SSOP-14 (DB) package: 6.20mm × 7.8mm body size, 0.65mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Independent control per buffer; high = high-Z output, low = enabled pass-through (A→Y). |
| 1A–4A | Buffer input | CMOS-compatible inputs tolerant to 5.5V regardless of VCC; no external pullups required for 3.3V logic. |
| 1Y–4Y | Buffer output | 3-state CMOS outputs with rail-to-rail swing; capable of sourcing/sinking 24mA at 3V for driving stubs or parallel loads. |
| VCC (Pin 14) | Positive supply | Single 1.65–3.6V rail powers all four buffers; requires local 0.1μF bypass capacitor adjacent to pin. |
| GND (Pin 7) | Ground reference | Common return path for all I/O and internal circuitry; must be connected to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| 5.5V-tolerant inputs | Enables seamless interface between 3.3V SN74LVC125ADBR and upstream 5V microcontrollers or FPGAs without level shifters. |
| Per-channel 3-state control | Four independent OE pins allow selective bus segmentation - e.g., isolating CPU data bus from peripheral memory during DMA transfers. |
| Low propagation delay | 4.8ns max at 3.3V supports timing-critical applications like high-speed serial link sideband signaling or clock distribution gating. |
| High latch-up immunity | 250mA+ rating per JESD17 eliminates risk of destructive latch-up in telecom power modules exposed to ESD or load dump transients. |
| Wide temperature range | –40°C to 125°C operation meets extended industrial requirements for outdoor wireless infrastructure and base station cabinets. |
Applications
| Telecom Baseband Units | Optical Networking Line Cards |
|---|---|
|
Use Scenario: Isolating FPGA I/O banks from high-noise analog front-end circuits in 5G baseband processing units. IC Role / Device Role / Timing Role: Bus buffer providing controlled 3-state separation between digital control logic and RF calibration paths. Use Value: Prevents signal corruption during FPGA configuration cycles using independent OE control, while 5.5V input tolerance accommodates mixed-voltage test interfaces. |
Use Scenario: Driving parallel status LEDs and monitoring signals on EPON OLT line cards operating in temperature-controlled chassis. IC Role / Device Role / Timing Role: Noninverting level translator buffering GPIO outputs from 3.3V SoC to 5V LED drivers and fault-reporting optocouplers. Use Value: Eliminates need for discrete MOSFET translators; 24mA drive strength directly lights high-brightness indicators without external transistors. |
| Remote Radio Units (RRU) | Industrial Telecom Shelters |
|
Use Scenario: Managing data bus contention between dual-core DSPs and shared ADC/DAC peripherals in compact RRUs mounted on cell towers. IC Role / Device Role / Timing Role: Quad buffer acting as bi-directional bus arbitrator with per-lane OE control synchronized to DMA handshaking signals. Use Value: 4.8ns tpd ensures sub-cycle latency for real-time I/Q data routing; 125°C rating sustains reliability under sealed enclosure thermal stress. |
Use Scenario: Interfacing MCU-based power monitoring units (PMU) with legacy 5V sensor arrays in telecom shelter DC/DC module bays. IC Role / Device Role / Timing Role: Voltage-level adapter converting 3.3V MCU GPIOs to 5V-compatible control lines for relay drivers and thermal sensors. Use Value: Input overvoltage tolerance removes series resistors and protection diodes; reduces BOM count and layout area in space-constrained PMU PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH125A | Includes bus-hold circuitry on all inputs; otherwise identical voltage range, speed, and pinout. | Eliminates need for external pullup/pulldown resistors on unused inputs in high-reliability telecom control planes. | Select when floating input prevention is required without adding discrete components - especially in unattended RRU deployments. |
| 74LVC125PW,118 | NXP variant in TSSOP-14; identical electrical specs but different thermal resistance (RθJA = 150.8°C/W vs. 140.4°C/W for DB). | Slightly higher junction temperature rise under same power dissipation; may require derating in 125°C ambient enclosures. | Prefer SN74LVC125ADBR for thermally constrained telecom shelters where lower RθJA improves margin. |
Compared with SN74LVCH125A, SN74LVC125ADBR lacks bus-hold but offers tighter thermal performance in SSOP; versus 74LVC125PW,118, it provides superior thermal management for sustained operation in high-ambient telecom environments.
Availability
SN74LVC125ADBR is available at Aetrix Electronics and suitable for telecom baseband units, optical networking line cards, and industrial telecom shelters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC125ADBR 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 for industrial, automotive, and communications markets.
The SN74LVC125ADBR belongs to TI's LVC logic family, engineered for low-voltage, high-speed bus interfacing in mixed-signal telecom infrastructure - emphasizing voltage translation, noise immunity, and thermal resilience.
FAQ
What is the maximum input voltage the SN74LVC125ADBR can tolerate?
The SN74LVC125ADBR accepts input voltages up to 5.5V regardless of VCC level - a key feature enabling direct connection to 5V legacy logic without external level-shifting components. This specification is guaranteed across the full operating temperature range (–40°C to 125°C) and is validated per TI's absolute maximum ratings table. The SN74LVC125ADBR maintains this tolerance even when VCC is as low as 1.65V.
Does the SN74LVC125ADBR support hot insertion or live bus swapping?
Yes, the SN74LVC125ADBR supports hot insertion due to its 5.5V-tolerant inputs and 3-state outputs. When OE is held high during power-up, all outputs remain in high-impedance state until VCC stabilizes - preventing bus contention. TI recommends tying each OE to VCC via a pullup resistor (value determined by driver sink capability) to ensure defined state during power sequencing. This behavior is explicitly documented in the SN74LVC125ADBR functional description section.
What is the thermal resistance (RθJA) of the SN74LVC125ADBR in its SSOP-14 package?
The SN74LVC125ADBR in SSOP-14 (DB) package has a junction-to-ambient thermal resistance (RθJA) of 140.4°C/W, as specified in TI's official thermal metrics table. This value applies under standard JEDEC high-K board conditions and is critical for thermal design in enclosed telecom shelters. Derating begins above 60°C ambient, with linear reduction of 5.5mW/K - a detail confirmed in the SN74LVC125ADBR datasheet Section 5.4.
Can the SN74LVC125ADBR be used as a level shifter between 3.3V and 5V systems?
Yes, the SN74LVC125ADBR functions as a unidirectional level shifter: 5V inputs are safely accepted and translated to 3.3V-compatible outputs (VOH ≥ VCC–0.2V, VOL ≤ 0.3V). However, it does not translate 3.3V outputs to 5V - the output swing is rail-referenced to VCC. For bidirectional translation, external circuitry or a dedicated level shifter IC is required. This capability is explicitly cited in the SN74LVC125ADBR feature list and application examples.
What is the recommended bypass capacitor for the SN74LVC125ADBR VCC pin?
Texas Instruments recommends a 0.1μF ceramic bypass capacitor placed as close as possible to the VCC pin (Pin 14) of the SN74LVC125ADBR. This value is specified in Section 8.2 of the official datasheet for single-supply devices. For optimal high-frequency noise suppression, TI further suggests paralleling with a 1μF capacitor - a practice validated in layout guidelines shown in Figure 8-4 of the SN74LVC125ADBR documentation.
SN74LVC125ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-SSOP (0.209", 5.30mm 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-SSOP
SN74LVC125ADBR FAQ
1.How can I place an order for SN74LVC125ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125ADBR 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 SN74LVC125ADBR reliable?
The price and inventory of SN74LVC125ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125ADBR is usually 5 days.
3.What payment methods are accepted for SN74LVC125ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125ADBR transactions.
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4.How is shipping managed for SN74LVC125ADBR?
SN74LVC125ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125ADBR 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 SN74LVC125ADBR?
For technical support, including SN74LVC125ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125ADBR requirements.
6.How does Aetrix verify that SN74LVC125ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LVC125ADBR 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 SN74LVC125ADBR meets industry standards.
7.What is the process for return or replacement of SN74LVC125ADBR?
All SN74LVC125ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125ADBR, 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 SN74LVC125ADBR part is unused and in its original packaging.
Return procedure for SN74LVC125ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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