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Texas Instruments SN74CBTLV3126PW
- Part No.:
- SN74CBTLV3126PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTLV3126PW.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,668
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Product details
Overview
SN74CBTLV3126PW from Texas Instruments is a low-voltage quadruple FET bus switch with independent 5Ω analog switches, 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, and is used for protocol isolation (JTAG/SPI/GPIO) in enterprise computing and wired networking systems.
For engineers reviewing the SN74CBTLV3126PW datasheet, SN74CBTLV3126PW pinout, SN74CBTLV3126PW application, or SN74CBTLV3126PW equivalent, key selection criteria include on-resistance (5–8 Ω), Ioff leakage (<10 µA at VCC = 0), propagation delay (<0.25 ns), thermal resistance (148.9°C/W), and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The SN74CBTLV3126PW implements four independent bidirectional FET switches, each controlled by a dedicated active-high output-enable (OE) input. Its CMOS-based transmission-gate architecture enables rail-to-rail analog/digital signal pass-through without level shifting.
Each switch exhibits low on-state resistance (5–8 Ω typical at VCC = 3.3V, II = 64mA), minimal charge injection, and guaranteed isolation during power-off via Ioff functionality. The device meets JESD 78 Class II latch-up immunity (>100 mA) and supports hot-swap operation without power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (ron) | 5–8 Ω typical at VCC = 3.3V, 64mA - ensures minimal voltage drop and signal attenuation across switched paths |
| Supply voltage (VCC) | 2.3V to 3.6V - compatible with 2.5V and 3.3V logic domains without level translation |
| Ioff leakage current | <10 µA at VCC = 0V - prevents backflow current and protects powered-down circuitry |
| Propagation delay (tpd) | 0.15–0.25 ns - enables high-speed signal routing in >1 GHz digital interfaces |
| Operating temperature | –40°C to +85°C - qualified for industrial and enterprise-grade embedded environments |
| ESD rating (HBM) | ±2000 V - provides robust handling margin during board assembly and system integration |
| Input capacitance (Ci) | 2.5 pF - minimizes loading on driving sources and preserves signal integrity |
Pinout & Package
TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm lead pitch, exposed thermal pad (optional GND connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-high enable inputs | Individually control conduction state of each switch; tie to GND via pull-down resistor for safe power-up/down |
| 1A/1B, 2A/2B, 3A/3B, 4A/4B | Bidirectional I/O channels | Pass rail-to-rail analog/digital signals with no directionality constraint; symmetric A↔B path |
| VCC | Power supply | Single 2.3–3.6V supply powers all four switches and internal logic; requires local 0.1 µF decoupling |
| GND | Ground reference | Common return for all channels and control logic; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 5Ω low on-resistance | Enables <10 mV drop at 2 mA, preserving signal fidelity in high-speed data buses |
| Rail-to-rail switching | Supports full 0–VCC analog/digital swing without clipping or distortion on any I/O pair |
| Ioff partial-power-down | Blocks current flow when VCC = 0, eliminating need for external isolation in hot-swap systems |
| Standard 126-type pinout | Ensures drop-in compatibility with legacy 74-series bus switches in existing PCB layouts |
| JESD 78 Class II latch-up immunity | Withstands >100 mA transient stress, meeting industrial reliability requirements |
Applications
| Protocol Isolation | Hot-Swap Backplane |
|---|---|
Use Scenario: Isolating JTAG debug, SPI configuration, or GPIO control lines between processor and peripherals in server motherboards. IC Role / Device Role / Timing Role: Bidirectional signal gate enabling/disabling per-channel access without level shifters or buffers. Use Value: Eliminates cross-talk and contention during firmware updates while maintaining full 3.3V signal integrity. |
Use Scenario: Enabling live insertion/removal of line cards in telecom chassis with uncontrolled power sequencing. IC Role / Device Role / Timing Role: Power-fault-tolerant bus switch providing isolation when VCC is absent or unstable. Use Value: Prevents backfeeding into powered-down modules, removing need for complex power-rail coordination logic. |
| Enterprise Storage Interconnect | Industrial I/O Multiplexing |
Use Scenario: Sharing a single SPI flash interface among multiple FPGA configuration images in storage controllers. IC Role / Device Role / Timing Role: Low-latency, low-capacitance analog switch routing clock/data between master and selected slave. Use Value: Achieves sub-nanosecond tpd and 2.5 pF Ci to sustain >50 MHz SPI clock rates without signal degradation. |
Use Scenario: Dynamically routing sensor inputs or actuator outputs across shared MCU ADC/DAC pins in PLC modules. IC Role / Device Role / Timing Role: Four independent, software-controllable signal paths replacing mechanical relays or discrete MOSFET arrays. Use Value: Reduces BOM count and PCB area vs. discrete solutions while supporting 0–3.3V industrial sensor ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245PW | Octal channel, 3-state outputs, higher Ron (~6.5 Ω), same VCC range and Ioff | Used where 8-channel density and output disable (not just switch open) are required | Select SN74CBTLV3245PW when expanding from quad to octal routing or needing 3-state bus hold capability |
| TS3A24159RGTR | 2-channel, 0.7 Ω Ron, 1.65–3.6V VCC, lower ESD (±2 kV HBM), no Ioff spec | Targeted at portable, battery-powered systems requiring ultra-low Ron and smaller footprint | Choose TS3A24159RGTR only if Ioff is not needed and dual-channel operation suffices for the design |
Compared with SN74CBTLV3126PW, SN74CBTLV3245PW offers double channel count but lacks independent OE per switch, while TS3A24159RGTR delivers lower Ron and wider voltage range but omits Ioff protection-making SN74CBTLV3126PW optimal for industrial hot-swap isolation where power-domain independence is critical.
Availability
SN74CBTLV3126PW is available at Aetrix Electronics and suitable for enterprise computing, wired networking, and industrial automation applications requiring stable component supply and long-term lifecycle support.
Supply support for SN74CBTLV3126PW 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74CBTLV3126PW belongs to TI's CBTLV low-voltage bus switch family, engineered for high-speed, low-distortion signal routing in dense, power-sensitive digital systems.
FAQ
What is the maximum operating temperature for the SN74CBTLV3126PW?
The SN74CBTLV3126PW is rated for operation from –40°C to +85°C ambient temperature. This specification applies specifically to the TSSOP-14 (PW) package variant and is validated per JEDEC JESD22-A104. Operation beyond this range may compromise parametric performance and reliability.
Does the SN74CBTLV3126PW support true bidirectional signal flow?
Yes, the SN74CBTLV3126PW supports fully bidirectional analog and digital signal flow between each A and B terminal pair. Its FET-based transmission gate architecture imposes no directionality-signals pass equally well from A to B or B to A, with identical on-resistance and timing characteristics in both directions.
How does the Ioff feature function in the SN74CBTLV3126PW?
The Ioff feature in the SN74CBTLV3126PW disables all internal conduction paths when VCC = 0V, limiting leakage current to <10 µA regardless of voltage applied to I/O pins. This prevents damaging back-current flow into unpowered sections of a system, enabling safe hot-swap and partial-power-down operation without external protection circuitry.
Can the SN74CBTLV3126PW be used with 1.8V logic levels?
Yes, the SN74CBTLV3126PW supports 1.8V-compatible control thresholds: VIH(min) = 2.0V at VCC = 3.6V and 1.7V at VCC = 2.7V, allowing direct interfacing with 1.8V GPIO drivers when VCC ≥ 2.7V. Input voltage range extends down to –0.5V, ensuring robustness against undershoot.
Is the thermal pad on the SN74CBTLV3126PW package required to be soldered?
No, the exposed thermal pad on the SN74CBTLV3126PW TSSOP-14 package has no electrical or thermal requirement for soldering. If connected, it must be left floating or tied to GND-TI specifies no mandatory thermal attachment, and standard reflow profiles achieve adequate junction temperature control without pad connection.
SN74CBTLV3126PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
SN74CBTLV3126PW FAQ
1.How can I place an order for SN74CBTLV3126PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3126PW 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 SN74CBTLV3126PW reliable?
The price and inventory of SN74CBTLV3126PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3126PW is usually 5 days.
3.What payment methods are accepted for SN74CBTLV3126PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTLV3126PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBTLV3126PW?
SN74CBTLV3126PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3126PW 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 SN74CBTLV3126PW?
For technical support, including SN74CBTLV3126PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3126PW requirements.
6.How does Aetrix verify that SN74CBTLV3126PW is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3126PW 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 SN74CBTLV3126PW meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3126PW?
All SN74CBTLV3126PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3126PW, 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 SN74CBTLV3126PW part is unused and in its original packaging.
Return procedure for SN74CBTLV3126PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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