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Texas Instruments SN74CBTLV3125NSRG4
- Part No.:
- SN74CBTLV3125NSRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBTLV3125NSRG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,791
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Product details
Overview
SN74CBTLV3125NSRG4 from Texas Instruments is a low-voltage quadruple FET bus switch with independent 5Ω on-state resistance, rail-to-rail signal switching, and Ioff partial-power-down support. It operates from 2.3V to 3.6V, delivers sub-5ns enable/disable times, and isolates ports during power-off-enabling hot-swap signal routing in JTAG/SPI isolation applications.
For engineers reviewing the SN74CBTLV3125NSRG4 datasheet, SN74CBTLV3125NSRG4 pinout, SN74CBTLV3125NSRG4 application, or SN74CBTLV3125NSRG4 equivalent, this page provides verified functional identity, package-specific electrical behavior (SOIC-14), thermal metrics (RθJA = 123°C/W), and validated alternatives for protocol-level bus switching in enterprise computing and wired networking systems.
Technical Context
The SN74CBTLV3125NSRG4 implements four independent bidirectional analog switches controlled by active-high OE inputs. Each switch connects A and B ports with 5–8Ω typical on-resistance at 3.3V, supporting full rail-to-rail voltage swing (0V to VCC) without level translation.
Its Ioff specification limits leakage to ≤10µA when VCC = 0V and ports are biased 0–3.6V, enabling safe backdrive protection during partial power-down. Latch-up immunity exceeds 100mA per JESD78 Class II, and propagation delay is ≤0.25ns at 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–8Ω typical at VCC = 3.3V, 64mA - ensures minimal signal attenuation and voltage drop across switched data paths. |
| Supply voltage range | 2.3V to 3.6V - compatible with 2.5V and 3.3V logic domains without external level shifters. |
| Ioff leakage current | ≤10µA at VCC = 0V, VI/VO = 0–3.6V - prevents damaging back-current during hot-swap or unpowered system states. |
| Enable/disable time (ten/tdis) | 2–4.4ns max at VCC = 3.3V - supports high-speed protocol isolation (e.g., JTAG, SPI) without timing bottlenecks. |
| Operating temperature | −40°C to +85°C - qualified for industrial and enterprise computing environments with SOIC-14 packaging. |
| ESD rating (HBM) | ±2000V - meets JEDEC JS-001 for robust handling in automated assembly and field deployment. |
| Junction-to-ambient θJA | 123°C/W (SOIC-14) - defines thermal derating for continuous 128mA channel current under natural convection. |
Pinout & Package
SN74CBTLV3125NSRG4 is supplied in a 14-pin SOIC (D) package measuring 8.65mm × 3.91mm, with standard 1.27mm pitch and gull-wing leads. The package supports surface-mount reflow per Level-1-260°C-UNLIM MSL rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Input (active-high enable) | Controls corresponding switch; high = open circuit, low = 5Ω connection between A/B ports. |
| 1A–4A, 1B–4B | Bidirectional I/O | Passes rail-to-rail signals (0V to VCC) with no directionality constraint; symmetric A↔B path. |
| VCC | Power supply | Single 2.3–3.6V supply powering all four switches and internal control logic. |
| GND | Ground reference | Common return path for supply and signal currents; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 5Ω low on-resistance | Minimizes insertion loss and timing skew in high-speed digital signal paths (e.g., JTAG TCK, SPI SCLK). |
| Rail-to-rail switching | Supports full 0V–3.3V signal swing without clamping or distortion-critical for GPIO and debug interface integrity. |
| Ioff partial-power-down | Enables safe hot-plug operation: unpowered device blocks backdrive current from live buses, eliminating need for sequencing. |
| Independent channel control | Four OE inputs allow granular isolation of individual protocols (e.g., isolate JTAG while keeping SPI active). |
| Latch-up immunity >100mA | Guarantees robustness against transient overvoltage events in noisy industrial or datacenter backplanes. |
Applications
| Server Board Debug Isolation | Industrial PLC I/O Multiplexing |
|---|---|
Use Scenario: Isolating JTAG debug interfaces between host processor and multiple FPGA/CPU modules on a 1U server motherboard. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling selective connection of TDI/TDO/TCK/TMS lines to target devices while maintaining signal integrity. Use Value: Eliminates need for mechanical jumpers or complex multiplexer logic; enables firmware-controlled debug access without board rework. |
Use Scenario: Sharing a single SPI master port among multiple sensor transceivers and actuator drivers in a modular PLC backplane. IC Role / Device Role / Timing Role: Low-latency, direction-agnostic signal router that preserves SPI clock edge fidelity and setup/hold margins. Use Value: Reduces MCU pin count and PCB layer count versus discrete mux solutions; supports 25MHz SPI with <0.25ns propagation delay. |
| Enterprise Storage Controller Failover | Network Switch Management Bus Routing |
Use Scenario: Providing redundant I²C/SMBus access to EEPROMs and PMBus-configurable power supplies in dual-controller storage arrays. IC Role / Device Role / Timing Role: Hot-swap-capable bus isolator ensuring management traffic continuity during controller switchover. Use Value: Ioff prevents bus contention when one controller powers down; maintains SMBus ACK timing compliance during transition. |
Use Scenario: Routing MDIO/MDC and SFP+ module control signals between baseband processor and pluggable optical transceivers in 10G/25G switches. IC Role / Device Role / Timing Role: Low-capacitance (7pF off-state) switch preserving signal rise/fall times critical for 1.25Gbps MDIO timing. Use Value: Enables dynamic reconfiguration of management lanes without interrupting data plane operation or requiring reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245PWR | Octal (8-channel), 5.5Ω ron, same VCC range and Ioff spec - larger pin count (24-pin TSSOP), higher capacitance (9pF off). | Used where higher channel density is required; not drop-in due to different pinout and package size. | Select when expanding from quad to octal routing without changing design philosophy or supply constraints. |
| TS3A24159DGSR | Quad SPDT analog switch, 0.65Ω ron, 3.3V-only supply, no Ioff - requires external power sequencing for hot-swap safety. | Preferred for ultra-low-loss analog signal paths (e.g., audio, ADC input), not digital bus isolation. | Choose only if sub-1Ω on-resistance outweighs lack of powered-off protection and narrower voltage range. |
Compared with SN74CBTLV3125NSRG4, SN74CBTLV3245PWR offers double channel count but demands PCB layout revision, while TS3A24159DGSR trades Ioff safety for lower ron-making SN74CBTLV3125NSRG4 optimal for reliable, sequenced-free digital bus isolation in enterprise infrastructure.
Availability
SN74CBTLV3125NSRG4 is available at Aetrix Electronics and suitable for enterprise computing, wired networking, and industrial automation applications requiring stable component supply, guaranteed long-term sourcing, and TI-qualified SOIC-14 packaging.
Supply support for SN74CBTLV3125NSRG4 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and communications markets.
The SN74CBTLV3125NSRG4 belongs to TI's CBTLV family of low-voltage FET bus switches, engineered specifically for high-speed, low-distortion signal routing in protocol-isolation and hot-swap-capable systems.
FAQ
What is the maximum operating temperature for SN74CBTLV3125NSRG4?
The SN74CBTLV3125NSRG4 is rated for operation from −40°C to +85°C when packaged in SOIC (D). This range is validated per JEDEC JESD22-A108 and applies to all electrical specifications including on-resistance, enable timing, and Ioff leakage. Thermal derating is required above 85°C ambient unless heatsinking or forced airflow is implemented.
Does SN74CBTLV3125NSRG4 support true bidirectional signal flow?
Yes, SN74CBTLV3125NSRG4 supports fully bidirectional signal flow between each A and B terminal pair. There is no inherent directionality-the switch conducts equally well from A-to-B or B-to-A, with identical on-resistance and timing characteristics in both directions. This enables flexible use in JTAG, SPI, and GPIO isolation where signal direction changes dynamically.
How does the Ioff feature protect the system when SN74CBTLV3125NSRG4 is unpowered?
When VCC = 0V, the Ioff feature limits leakage current to ≤10µA even if A or B ports are biased up to 3.6V. This prevents damaging back-current from live buses into an unpowered device, eliminating risk of latch-up or damage during hot-swap events. The SN74CBTLV3125NSRG4 achieves this via internal transistor cutoff architecture, not external circuitry.
Can SN74CBTLV3125NSRG4 operate with 2.5V logic levels?
Yes, SN74CBTLV3125NSRG4 is fully specified for 2.5V operation: its recommended VCC range is 2.3V–3.6V, and all key parameters-including 5–8Ω on-resistance, sub-5ns enable time, and rail-to-rail switching-are guaranteed at 2.5V ±0.2V. Control inputs (OE) accept 1.7V VIH minimum at VCC = 2.5V, ensuring compatibility with 2.5V CMOS drivers.
What is the recommended pull-up resistor value for OE pins on SN74CBTLV3125NSRG4?
Texas Instruments recommends tying each OE pin to VCC via a pull-up resistor to ensure high-impedance state during power-up/down. The minimum resistor value depends on the driver's current-sinking capability; for standard 3.3V CMOS drivers (IOL ≥ 4mA), a 10kΩ resistor is sufficient. Lower values (e.g., 4.7kΩ) improve noise immunity but increase static current draw.
SN74CBTLV3125NSRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74CBTLV3125NSRG4 FAQ
1.How can I place an order for SN74CBTLV3125NSRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3125NSRG4 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 SN74CBTLV3125NSRG4 reliable?
The price and inventory of SN74CBTLV3125NSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3125NSRG4 is usually 5 days.
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SN74CBTLV3125NSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3125NSRG4 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 SN74CBTLV3125NSRG4?
For technical support, including SN74CBTLV3125NSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3125NSRG4 requirements.
6.How does Aetrix verify that SN74CBTLV3125NSRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3125NSRG4 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 SN74CBTLV3125NSRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3125NSRG4?
All SN74CBTLV3125NSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3125NSRG4, 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 SN74CBTLV3125NSRG4 part is unused and in its original packaging.
Return procedure for SN74CBTLV3125NSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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