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Texas Instruments SN74LVC125ADBRG4
- Part No.:
- SN74LVC125ADBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC125ADBRG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,642
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Product details
Overview
SN74LVC125ADBRG4 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 SN74LVC125ADBRG4 datasheet, SN74LVC125ADBRG4 pinout, SN74LVC125ADBRG4 application, or SN74LVC125ADBRG4 equivalent, key selection criteria include 3-state output control per channel, input overvoltage tolerance, low ground bounce (<0.8V), and SSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC125ADBRG4 implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Its CMOS design enables bidirectional voltage translation: 3.3V logic can drive 5V-tolerant inputs while sourcing/sinking ±24mA at 3V supply, supporting clean signal routing across power domain boundaries.
Each buffer features controlled edge rates (≤8 ns/V), latch-up immunity >250mA per JESD17, and robust ESD protection (±2000V HBM). The device requires external pull-up on OE pins during power sequencing to guarantee high-impedance state at startup - a critical requirement for hot-swap and backplane applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V–3.6V: Enables interoperability between 1.8V, 2.5V, and 3.3V logic domains without level shifters. |
| Input Voltage Tolerance | Up to 5.5V: Allows direct connection to legacy 5V peripherals without clamping diodes or resistors. |
| tpd (Max) | 4.8ns at 3.3V: Supports >100MHz data rates in point-to-point digital interfaces like JTAG or parallel control buses. |
| Output Drive | ±24mA at 3V: Sufficient to drive 50Ω transmission lines or multiple CMOS loads without buffering. |
| Operating Temp | –40°C to 125°C: Qualified for industrial and telecom infrastructure environments including remote radio units (RRU). |
| ESD Rating | ±2000V HBM: Meets IEC 61000-4-2 Level 2 requirements for board-level handling and field reliability. |
| Power Dissipation | 500mW max (TA ≤125°C): Compatible with standard SSOP thermal pads and airflow-limited enclosures. |
Pinout & Package
SN74LVC125ADBRG4 uses the SSOP-14 (DB) package: 6.20mm × 7.8mm body, 0.65mm lead pitch, gull-wing leads. Pin 1 marked by beveled corner; pin 7 = GND, pin 14 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Independent control per buffer; must be pulled high via resistor during power-up to prevent bus contention. |
| 1A–4A | Noninverting input | Accepts 0–5.5V signals; compatible with TTL, LVTTL, and 5V CMOS sources. |
| 1Y–4Y | 3-state noninverting output | High-impedance when OE = high; drives rail-to-rail outputs with <0.8V ground bounce at 3.3V. |
| GND (Pin 7) | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance connection to PCB ground plane. |
| VCC (Pin 14) | Positive supply | Must be bypassed with 0.1μF ceramic capacitor placed ≤2mm from pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel 3-state control | Enables selective bus isolation without disabling entire data path - essential for multi-drop memory or configuration buses. |
| 5.5V-tolerant inputs | Eliminates need for external voltage translators when interfacing with 5V microcontrollers or legacy peripherals. |
| Low ground bounce (VOLP < 0.8V) | Prevents false logic transitions in adjacent circuits during simultaneous output switching - critical in dense telecom modules. |
| Wide temperature range (–40°C to 125°C) | Validated for deployment in outdoor wireless infrastructure such as tower-mounted amplifiers (TMA) and remote electrical tilt (RET) units. |
| Latch-up immunity >250mA | Ensures robustness against transient overcurrent events in unregulated power environments like DC/DC telecom modules. |
Applications
| Optical Networking Line Card | Telecom Baseband Unit |
|---|---|
Use Scenario: Signal conditioning and isolation between FPGA I/O banks and EPON optical transceivers operating at different voltage domains. IC Role / Device Role / Timing Role: Bidirectional level translator and bus driver enabling 3.3V FPGA to interface with 5V-tolerant SFP+ module control lines. Use Value: Eliminates discrete level-shifter ICs, reduces BOM count, and maintains signal integrity up to 100MHz due to sub-5ns propagation delay. | Use Scenario: Isolating control signals between DSP processors and analog front-end (AFE) components in 4G/5G base station radios. IC Role / Device Role / Timing Role: Quad buffer providing independent enable control for clock enable, reset, and GPIO lines routed across mixed-voltage subsystems. Use Value: Prevents bus contention during power sequencing and ensures deterministic high-Z state during processor reset sequences. |
| Remote Radio Unit (RRU) | Power Distribution Unit (PDU) |
Use Scenario: Managing status and configuration signals between RF transceiver ASICs and monitoring microcontrollers in outdoor cellular base stations. IC Role / Device Role / Timing Role: Temperature-hardened bus buffer ensuring reliable communication under thermal cycling from –40°C to 125°C ambient. Use Value: Maintains timing margins and signal fidelity despite wide junction temperature swings, avoiding rework in field-deployed hardware. | Use Scenario: Interfacing microcontroller GPIOs with relay drivers and current-sense ADCs in telecom shelter power management systems. IC Role / Device Role / Timing Role: Voltage-translating buffer isolating 3.3V MCU logic from noisy 5V analog sensor and actuator circuitry. Use Value: Prevents analog measurement corruption caused by digital switching noise coupling through shared ground paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125ADR | SOIC-14 package; identical electrical specs and pinout; same -40°C to 125°C rating. | Preferred for through-hole prototyping or legacy board designs using D-package footprints. | Select when mechanical compatibility with existing SOIC layouts is required; no redesign needed. |
| 74LVC125APW | TSSOP-14 package; identical logic function and specs; slightly higher RθJA (150.8°C/W vs. 140.4°C/W for DB). | Better suited for space-constrained PCBs where SSOP lead spacing causes soldering challenges. | Choose for fine-pitch automated assembly; verify thermal margin in sealed enclosures due to higher junction-to-ambient resistance. |
Compared with SN74LVC125ADR and 74LVC125APW, SN74LVC125ADBRG4 offers optimal thermal performance (RθJA = 140.4°C/W) and proven manufacturability in SSOP-14 for high-volume telecom line cards - making it the preferred choice where board area and thermal reliability are jointly constrained.
Availability
SN74LVC125ADBRG4 is available at Aetrix Electronics and suitable for telecom infrastructure, optical networking, and industrial embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC125ADBRG4 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 SN74LVC125A family was engineered for voltage translation and bus isolation in high-reliability telecom and networking equipment - emphasizing robust ESD performance, wide temperature operation, and seamless integration into mixed-voltage system architectures.
FAQ
What is the maximum input voltage the SN74LVC125ADBRG4 can tolerate?
The SN74LVC125ADBRG4 accepts input voltages up to 5.5V regardless of VCC level - a feature that enables direct interfacing with 5V logic without external level-shifting components. This overvoltage tolerance is specified across the full operating temperature range (–40°C to 125°C) and applies to all A-input pins. It is not a transient rating but a continuous DC specification verified per JEDEC standards.
Does the SN74LVC125ADBRG4 require external pull-up resistors on its OE pins?
Yes, the SN74LVC125ADBRG4 requires external pull-up resistors on all four OE pins to ensure outputs remain in high-impedance state during power-up and power-down sequences. TI recommends connecting each OE to VCC via a resistor sized to limit current to ≤100μA - typically 10kΩ to 100kΩ depending on VCC and driver sink capability. This prevents bus contention in systems with asynchronous power sequencing.
What is the typical propagation delay of the SN74LVC125ADBRG4 at 3.3V?
The typical propagation delay (tpd) of the SN74LVC125ADBRG4 is 2.5ns at VCC = 3.3V ± 0.3V and TA = 25°C, with a maximum of 4.8ns across the full operating temperature range (–40°C to 125°C). This value is measured under standard load conditions (CL = 30pF, Δt/Δv = 8ns/V) and applies to both rising and falling edges from A to Y terminals.
Can the SN74LVC125ADBRG4 be used in hot-swap applications?
Yes, the SN74LVC125ADBRG4 supports hot-swap operation when OE pins are properly biased with pull-up resistors and VCC ramp rates comply with TI's recommended limits (≤1V/ms). Its 5.5V-tolerant inputs, latch-up immunity (>250mA), and guaranteed high-Z state during power transitions make it suitable for backplane and modular telecom systems where cards are inserted or removed under power.
What package type does the SN74LVC125ADBRG4 use, and what are its key mechanical dimensions?
The SN74LVC125ADBRG4 uses the SSOP-14 (DB) package: body size 6.20mm × 5.30mm, overall footprint 6.20mm × 7.8mm, lead pitch 0.65mm, and gull-wing lead form. It is RoHS-compliant, moisture-sensitive level 1 (MSL-1), and rated for peak reflow at 260°C. The part marking "LC125A" appears on the top surface.
SN74LVC125ADBRG4 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:
- 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-SSOP
SN74LVC125ADBRG4 FAQ
1.How can I place an order for SN74LVC125ADBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC125ADBRG4 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 SN74LVC125ADBRG4 reliable?
The price and inventory of SN74LVC125ADBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC125ADBRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC125ADBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC125ADBRG4 transactions.
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4.How is shipping managed for SN74LVC125ADBRG4?
SN74LVC125ADBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC125ADBRG4 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 SN74LVC125ADBRG4?
For technical support, including SN74LVC125ADBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC125ADBRG4 requirements.
6.How does Aetrix verify that SN74LVC125ADBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC125ADBRG4 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 SN74LVC125ADBRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC125ADBRG4?
All SN74LVC125ADBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC125ADBRG4, 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 SN74LVC125ADBRG4 part is unused and in its original packaging.
Return procedure for SN74LVC125ADBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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