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Texas Instruments SN74CBTLV3125NSR
- Part No.:
- SN74CBTLV3125NSR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBTLV3125NSR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,804
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Product details
Overview
SN74CBTLV3125 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 protection. It operates from 2.3V to 3.6V, supports −40°C to 85°C ambient temperature (NS package), and delivers sub-nanosecond propagation delay (0.25 ns typical at 3.3V) for high-speed data isolation in JTAG, SPI, and GPIO routing.
For engineers reviewing the SN74CBTLV3125 datasheet, SN74CBTLV3125 pinout, SN74CBTLV3125 application, or SN74CBTLV3125 equivalent, this device serves as a low-loss, bidirectional signal switch for hot-swap-capable systems requiring powered-off isolation, latch-up immunity (>100 mA per JESD 78 Class II), and minimal insertion loss across 0–3.3V logic rails.
Technical Context
The SN74CBTLV3125 implements four independent NMOS pass-gate switches, each controlled by an active-high output-enable (OE) input. Each channel connects A and B ports bidirectionally with no internal directionality - signal flow is determined solely by external voltage differentials.
Its Ioff specification ensures <10 µA leakage when VCC = 0V and I/O pins are biased up to 3.6V, enabling true isolation during power-down. The device uses standard 125-type terminal-out architecture and requires OE pullup to VCC for reliable high-impedance state during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at 3.3V/64 mA - enables low-voltage-drop signal routing with <0.32 V drop at full rated current |
| Propagation delay (tpd) | 0.25 ns typical at 3.3V - supports >1 GHz signal integrity for high-speed digital buses |
| Supply voltage range | 2.3 V to 3.6 V - compatible with 2.5V and 3.3V logic families without level translation |
| Ioff leakage current | 10 µA max at VCC = 0V, VI/O = 0–3.6V - prevents backdrive damage during partial power-down |
| Operating temperature | −40°C to +85°C (NS package) - qualified for industrial-grade embedded and networking equipment |
| ESD rating (HBM) | ±2000 V - meets JEDEC JS-001 for robust handling in automated assembly and field service |
| Latch-up immunity | >100 mA per JESD 78 Class II - ensures reliability in noisy or fault-prone signal environments |
Pinout & Package
SN74CBTLV3125NSR is supplied in a 14-pin SOIC (NS) package measuring 8.65 mm × 3.91 mm, with standard 125-type terminal-out pin layout and gull-wing leads. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-high enable input | Drives corresponding switch ON when low; high-impedance state when high - requires pullup to VCC for safe power-up |
| 1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B | Bidirectional I/O port pair | Passes signals in either direction with rail-to-rail swing; no internal buffering or direction control |
| VCC | Power supply | Single 2.3–3.6V supply powers all four switches and internal bias circuitry |
| GND | Ground reference | Common return path for all channels and internal logic - must be low-inductance connection |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail switching | Supports full 0–3.3V signal swing on both A and B ports without clipping or distortion |
| Ioff partial-power-down protection | Blocks damaging back-current when VCC = 0V and I/O pins remain active - eliminates need for external power sequencing |
| 5Ω low on-resistance | Minimizes voltage drop and timing skew across high-speed data lines (e.g., JTAG TCK, SPI SCLK) |
| Sub-nanosecond propagation delay | 0.25 ns typical at 3.3V enables use in >1 Gbps serial links and multi-MHz clock distribution paths |
| Latch-up immunity >100 mA | Guarantees operation in electrically noisy environments such as motor drive control boards and industrial PLCs |
Applications
| Protocol Isolation | Hot-Swap Backplane |
|---|---|
|
Use Scenario: Isolating JTAG debug interface from host processor to prevent interference during firmware updates. IC Role / Device Role / Timing Role: Bidirectional signal switch enabling transparent TDI/TDO/TCK/TMS routing while blocking cross-talk between debug and application domains. Use Value: Eliminates need for separate level shifters or directional buffers; maintains signal integrity up to 100 MHz with <0.3 V drop at 64 mA. |
Use Scenario: Enabling live insertion of line cards into telecom chassis without disrupting upstream data flow. IC Role / Device Role / Timing Role: Signal gate that disconnects card-side buses during power-up/down sequences while preserving voltage isolation. Use Value: Ioff protection allows card I/O pins to remain at valid logic levels even when VCC is unpowered - avoids system reset or bus contention. |
| GPIO Multiplexing | Memory Interface Sharing |
|
Use Scenario: Sharing limited MCU GPIO pins among multiple peripherals (e.g., sensor array, display driver, UART transceiver). IC Role / Device Role / Timing Role: Low-latency analog switch selecting which peripheral connects to shared data/control lines. Use Value: 5Ω ron and 0.25 ns tpd preserve rise/fall times for 20+ MHz GPIO toggling; no added propagation skew between channels. |
Use Scenario: Allowing two processors to share a single parallel NOR flash memory without bus contention. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating flash address/data lines when one processor is inactive. Use Value: Rail-to-rail operation supports full 3.3V flash I/O swing; Ioff prevents backfeed from powered flash into unpowered controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245DBQR | Octal (8-channel), 5.5Ω ron, same VCC range and Ioff spec, but larger SSOP-24 package | Higher channel count suits wider data buses (e.g., 16-bit memory interfaces); not pin-compatible | Select when expanding from quad to octal switching without redesigning logic control scheme |
| TS3A24159RGTR | Quad SPDT analog switch, 0.75Ω ron, 3.6V max, but lacks Ioff and rail-to-rail support below 1.8V | Better for analog signal routing (e.g., audio, ADC inputs); unsuitable for powered-off isolation | Choose only for low-distortion analog multiplexing where Ioff and wide VIO range are not required |
Compared with SN74CBTLV3125, SN74CBTLV3245DBQR offers double the channel density at identical performance per channel but requires PCB layout changes; TS3A24159RGTR provides lower on-resistance for analog paths but cannot replace SN74CBTLV3125 in hot-swap or partial-power-down designs due to missing Ioff and limited voltage range.
Availability
SN74CBTLV3125 is available at Aetrix Electronics and suitable for datacenter interconnects, industrial motor drives, and wired networking infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74CBTLV3125 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 high-reliability IC design.
The SN74CBTLV3125 belongs to TI's CBTLV (low-voltage BiCMOS logic) family, engineered specifically for high-speed, low-power signal routing in computing, communications, and industrial control systems where signal integrity and power sequencing simplicity are critical.
FAQ
What is the maximum continuous current per channel for SN74CBTLV3125?
The SN74CBTLV3125 supports a continuous channel current of 128 mA per switch. This rating is specified under recommended operating conditions (VCC = 2.3 V to 3.6 V, TA = −40°C to +85°C) and ensures thermal stability and long-term reliability without derating in typical PCB layouts with adequate copper pour. Exceeding this current may increase on-resistance and junction temperature beyond safe limits.
Does SN74CBTLV3125 require external pull-up resistors on OE pins?
Yes, SN74CBTLV3125 requires OE pins to be tied to VCC via a pull-up resistor to ensure high-impedance state during power-up or power-down. The minimum resistor value depends on the current-sinking capability of the driving source; TI recommends values between 1 kΩ and 10 kΩ for most microcontroller GPIO drivers. Leaving OE floating risks unintended channel activation and signal contention.
Can SN74CBTLV3125 operate with 1.8V logic signals while powered from 3.3V VCC?
Yes, SN74CBTLV3125 supports rail-to-rail switching and fully accommodates 1.8V logic signals on its A/B ports when VCC = 3.3V. Its input thresholds (VIH = 2.0V min, VIL = 0.8V max at VCC = 3.3V) and bidirectional pass-gate architecture allow seamless interfacing between 1.8V peripherals and 3.3V controllers without level shifters - confirmed in TI's Application Report SBAA335.
What is the thermal resistance (RθJA) of SN74CBTLV3125NSR?
The SN74CBTLV3125NSR (SOIC-14 package) has a junction-to-ambient thermal resistance (RθJA) of 123.0°C/W under standard JEDEC test conditions (1-layer board, 1 in² copper). This value assumes proper PCB layout with thermal vias and ground plane; actual RθJA improves significantly with enhanced copper area and airflow. TI's Thermal Metrics report confirms this rating applies specifically to the NS package variant.
Is SN74CBTLV3125 compatible with hot-swap applications where VCC may be unpowered while I/O remains active?
Yes, SN74CBTLV3125 is explicitly designed for hot-swap use cases via its Ioff feature. When VCC = 0V, leakage current remains ≤10 µA even with I/O pins biased from 0V to 3.6V - preventing back-current damage and ensuring isolation. This capability is validated per JESD78 Class II latch-up testing and documented in Section 7.3 of the SCDS037K datasheet.
SN74CBTLV3125NSR 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
SN74CBTLV3125NSR FAQ
1.How can I place an order for SN74CBTLV3125NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3125NSR 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 SN74CBTLV3125NSR reliable?
The price and inventory of SN74CBTLV3125NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3125NSR is usually 5 days.
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SN74CBTLV3125NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3125NSR 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 SN74CBTLV3125NSR?
For technical support, including SN74CBTLV3125NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3125NSR requirements.
6.How does Aetrix verify that SN74CBTLV3125NSR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3125NSR 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 SN74CBTLV3125NSR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3125NSR?
All SN74CBTLV3125NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3125NSR, 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 SN74CBTLV3125NSR part is unused and in its original packaging.
Return procedure for SN74CBTLV3125NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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