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Texas Instruments SN74CBTLV3125PWG4
- Part No.:
- SN74CBTLV3125PWG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTLV3125PWG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,883
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Product details
Overview
SN74CBTLV3125PWG4 from Texas Instruments is a low-voltage quadruple FET bus switch with independent 5Ω analog switches, rail-to-rail signal switching (0–3.6 V), and Ioff partial-power-down protection. It operates from 2.3 V to 3.6 V, supports −40°C to +85°C ambient, and is used for protocol isolation (e.g., JTAG/SPI) in enterprise computing and wired networking systems.
For engineers reviewing the SN74CBTLV3125PWG4 datasheet, SN74CBTLV3125PWG4 pinout, SN74CBTLV3125PWG4 application, or SN74CBTLV3125PWG4 equivalent, key selection criteria include on-resistance (5–8 Ω), Ioff leakage (<10 µA at VCC = 0), propagation delay (<0.25 ns at 3.3 V), and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The SN74CBTLV3125PWG4 implements four independent bidirectional FET switches, each controlled by an active-high output-enable (OE) input. Each channel connects A and B ports with no polarity or direction constraint, enabling true analog signal pass-through.
Its Ioff feature actively blocks current flow when VCC = 0 V, ensuring isolation during power-down states-critical for hot-swap and live-insertion systems. The device uses standard CMOS-level control inputs compatible with 1.8-V logic thresholds while supporting full 0–3.6-V rail-to-rail data I/O swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.3 V to 3.6 V - Enables direct interface with 2.5-V and 3.3-V logic domains without level shifters. |
| On-State Resistance | 5 Ω typical at VCC = 3.3 V, 64 mA - Minimizes voltage drop and signal attenuation in high-speed digital or analog signal paths. |
| Ioff Leakage | <10 µA at VCC = 0 V - Prevents backdrive damage when downstream circuitry remains powered during host IC power-down. |
| Propagation Delay | 0.25 ns typical at VCC = 3.3 V - Supports >1-GHz signal integrity for JTAG, SPI, and GPIO isolation without timing penalty. |
| ESD Rating | ±2000 V HBM - Meets industrial-grade ESD robustness requirements for board-level handling and system integration. |
| Operating Temperature | −40°C to +85°C - Qualified for enterprise infrastructure, building automation, and wired networking equipment. |
| Channel Count | 4 independent bidirectional switches - Allows simultaneous isolation of multiple signal pairs (e.g., TCK/TMS/TDI/TDO). |
Pinout & Package
TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm lead pitch, surface-mount, lead-free (NiPdAu), moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 1B | Channel 1 I/O pair | Bidirectional signal path; connected when 1OE = low; isolated when 1OE = high. |
| 1OE | Channel 1 enable input | Active-high control; must be pulled to VCC via resistor during power-up/down to ensure high-Z state. |
| 2A, 2B | Channel 2 I/O pair | Independent of other channels; supports asynchronous enable/disable per signal line. |
| 2OE | Channel 2 enable input | CMOS-compatible threshold (VIH ≥ 2.0 V at VCC = 3.6 V); no external pull required if driven. |
| 3A, 3B / 4A, 4B | Channels 3 & 4 I/O pairs | Identical electrical behavior to Channels 1–2; enables full quad-signal routing flexibility. |
| 3OE, 4OE | Channels 3 & 4 enable inputs | Allow granular power gating per signal group-e.g., disable debug lines while keeping data lines active. |
| VCC | Power supply | Single 2.3–3.6 V rail powers all channels and logic; decoupling capacitor (0.1 µF) required adjacent to pin. |
| GND | Ground reference | Common return for all channels and control logic; requires low-inductance connection to solid ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | Supports 0–3.6 V signal swing across all four channels without distortion or clipping-ideal for mixed-voltage GPIO and debug interfaces. |
| Ioff partial-power-down protection | Blocks current flow between A/B ports when VCC = 0 V, eliminating need for external power sequencing in hot-swap applications. |
| 5 Ω low on-resistance | Ensures <10 mV voltage drop at 2 mA signal current-preserves logic margins and reduces jitter in clock/data paths. |
| 100 mA latch-up immunity | Complies with JESD78 Class II, enabling reliable operation in noisy industrial environments with transient coupling risks. |
| 1.8-V logic-compatible OE inputs | Accepts 1.7 V VIH minimum at VCC = 2.7–3.6 V-allows direct drive from low-voltage microcontrollers without level translation. |
Applications
| JTAG Debug Isolation | SPI Peripheral Multiplexing |
|---|---|
Use Scenario: Isolating JTAG pins (TCK/TMS/TDI/TDO) between host processor and FPGA/CPLD during firmware update or field reconfiguration. IC Role / Device Role / Timing Role: Bidirectional signal gate that enables/disables debug access without physical connector removal or system reset. Use Value: Eliminates risk of bus contention during concurrent debug and runtime operations; supports live firmware patching in enterprise servers. |
Use Scenario: Sharing a single SPI master interface among multiple flash memory devices or sensors in space-constrained embedded systems. IC Role / Device Role / Timing Role: Low-latency, low-distortion analog switch enabling time-multiplexed SPI communication without protocol translation. Use Value: Reduces MCU pin count and PCB layer count; maintains SPI timing integrity (tPHL/tpd < 0.25 ns) across all four channels. |
| Hot-Swap Backplane Signaling | Industrial GPIO Signal Routing |
Use Scenario: Enabling safe insertion/removal of line cards in telecom or datacenter backplanes where control signals remain active during card power cycling. IC Role / Device Role / Timing Role: Power-fault-tolerant signal bridge that isolates powered subsystems from unpowered modules. Use Value: Ioff prevents backfeed into unpowered cards; eliminates need for complex power-sequencing controllers in modular chassis designs. |
Use Scenario: Routing programmable I/O signals (e.g., alarm outputs, sensor inputs, actuator controls) in building automation controllers with mixed-voltage peripherals. IC Role / Device Role / Timing Role: Voltage-agnostic bidirectional switch supporting 0–3.3 V logic levels across diverse sensor/actuator interfaces. Use Value: Simplifies BOM by replacing multiple discrete level shifters; maintains signal integrity for 100-kHz GPIO toggling with sub-nanosecond skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245PWR | Octal (8-channel) configuration, identical 5 Ω ron and Ioff specs, same TSSOP-20 package. | Higher channel density suits wider buses (e.g., parallel address/data), but requires more PCB area and layout complexity. | Select when consolidating multiple signal groups onto one IC; verify trace length matching for timing-critical parallel buses. |
| TS3A24159RGTR | Lower 0.7 Ω ron, 1.65–3.6 V supply, ±30 mA continuous current, VQFN-16 package. | Better performance for analog sensor signals or higher-current GPIO, but lacks JESD78 Class II latch-up rating. | Prefer for precision analog multiplexing or battery-powered edge nodes; avoid in safety-critical industrial control where latch-up immunity is mandated. |
Compared with SN74CBTLV3125PWG4, SN74CBTLV3245PWR offers double the channel count in a larger footprint, while TS3A24159RGTR delivers lower resistance and wider voltage range at the cost of reduced latch-up robustness-making SN74CBTLV3125PWG4 optimal for cost-sensitive, high-reliability digital isolation in enterprise infrastructure.
Availability
SN74CBTLV3125PWG4 is available at Aetrix Electronics and suitable for enterprise computing, wired networking, and building automation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74CBTLV3125PWG4 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 SN74CBTLV3125PWG4 belongs to TI's CBTLV low-voltage bus switch family, engineered for high-speed digital signal isolation in infrastructure equipment where power sequencing simplicity, signal integrity, and reliability are critical.
FAQ
What is the maximum operating temperature range for SN74CBTLV3125PWG4?
The SN74CBTLV3125PWG4 is rated for operation from −40°C to +85°C ambient temperature. This range applies specifically to the TSSOP-14 (PW) package variant and is validated per JEDEC JESD22-A104 thermal cycling standards. Operation outside this range may degrade parametric performance or reliability.
Does SN74CBTLV3125PWG4 support true bidirectional signal flow?
Yes, SN74CBTLV3125PWG4 supports fully bidirectional analog signal transmission between its A and B terminals. Each of the four channels functions as a passive FET switch with no internal directionality-data flows equally well from A→B or B→A when the corresponding OE pin is low.
How does the Ioff feature protect circuits during partial power-down?
The Ioff feature in SN74CBTLV3125PWG4 disables all internal conduction paths when VCC = 0 V, limiting leakage current to <10 µA regardless of voltage applied to A/B ports. This prevents damaging back-current from powered downstream components into the unpowered SN74CBTLV3125PWG4, satisfying IEC 61000-4-2 system-level ESD survivability requirements.
What is the recommended pull-up resistor value for OE pins on SN74CBTLV3125PWG4?
Texas Instruments recommends tying each OE pin to VCC through a pull-up resistor to guarantee high-impedance state during power-up/down transients. The minimum resistor value depends on the driver's sink capability; for standard CMOS drivers, 10 kΩ is typical. Values below 1 kΩ increase static current without improving reliability.
Can SN74CBTLV3125PWG4 be used with 1.8-V logic control signals?
Yes, SN74CBTLV3125PWG4 accepts 1.8-V logic levels on its OE inputs: VIH is specified as ≥1.7 V at VCC = 2.3–2.7 V and ≥2.0 V at VCC = 2.7–3.6 V. This allows direct interfacing with 1.8-V microcontrollers or FPGAs without level-shifting circuitry-reducing BOM count and layout complexity.
SN74CBTLV3125PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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-TSSOP
SN74CBTLV3125PWG4 FAQ
1.How can I place an order for SN74CBTLV3125PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3125PWG4 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 SN74CBTLV3125PWG4 reliable?
The price and inventory of SN74CBTLV3125PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3125PWG4 is usually 5 days.
3.What payment methods are accepted for SN74CBTLV3125PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTLV3125PWG4 transactions.
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4.How is shipping managed for SN74CBTLV3125PWG4?
SN74CBTLV3125PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3125PWG4 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 SN74CBTLV3125PWG4?
For technical support, including SN74CBTLV3125PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3125PWG4 requirements.
6.How does Aetrix verify that SN74CBTLV3125PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3125PWG4 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 SN74CBTLV3125PWG4 meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3125PWG4?
All SN74CBTLV3125PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3125PWG4, 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 SN74CBTLV3125PWG4 part is unused and in its original packaging.
Return procedure for SN74CBTLV3125PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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