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Texas Instruments SN74CBTLV3126DGVR
- Part No.:
- SN74CBTLV3126DGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTLV3126DGVR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,429
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Product details
Overview
SN74CBTLV3126 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 across 2.3–3.6 V supply, supports –40°C to 85°C ambient, and is used for protocol isolation in JTAG/SPI/GPIO routing on server backplanes and industrial controllers.
For engineers reviewing the SN74CBTLV3126 datasheet, SN74CBTLV3126 pinout, SN74CBTLV3126 application, or SN74CBTLV3126 equivalent, key selection criteria include on-resistance stability over voltage range, guaranteed high-impedance state during power sequencing, thermal performance in TVSOP packaging, and compatibility with 1.8-V/3.3-V mixed-signal interfaces.
Technical Context
The SN74CBTLV3126 implements four independent bidirectional FET switches, each controlled by an active-high OE input. Each switch connects A and B ports with sub-8 Ω typical on-resistance at 3.3 V and supports full rail-to-rail analog/digital signal pass-through without level translation.
Its Ioff specification (≤10 µA at VCC = 0 V) ensures no backflow current when unpowered, enabling hot-swap isolation in live-insertion systems. The device maintains channel isolation and latch-up immunity (>100 mA per JESD 78 Class II) across its full operating temperature range.
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 families without level shifters. |
| On-Resistance (ron) | 5 Ω (typ) at VCC = 3.3 V, II = 64 mA - Ensures minimal signal attenuation and voltage drop in high-speed data paths. |
| Ioff | 10 µA max at VCC = 0 V - Guarantees safe operation during partial power-down; prevents backdrive damage to powered subsystems. |
| Propagation Delay (tpd) | 0.15–0.25 ns at VCC = 3.3 V - Supports >1 GHz signal integrity for JTAG, SPI, and GPIO isolation without timing penalty. |
| Operating Temperature | –40°C to +85°C - Validated for industrial control and enterprise computing environments with passive cooling. |
| ESD Rating (HBM) | ±2000 V - Meets JEDEC JS-001 for robust handling in automated assembly and field service. |
| Switch Capacitance (Cio(OFF)) | 7 pF - Minimizes crosstalk and loading on adjacent high-speed traces in dense PCB layouts. |
Pinout & Package
SN74CBTLV3126DGVR uses the TVSOP-14 (DGV) package: 3.60 mm × 4.40 mm body, 0.65 mm lead pitch, exposed thermal pad (optional GND connection). Pin count and function mapping match standard 126-type layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-high enable inputs | Individually control switch conduction; pull low to isolate A–B path; compatible with 1.8-V CMOS logic thresholds. |
| 1A–4A, 1B–4B | Bidirectional I/O channels | Pass signals in either direction with rail-to-rail swing; no internal directionality or buffering - true analog bus switch behavior. |
| VCC | Power supply | Single 2.3–3.6 V supply powers all four switches; decoupling capacitor required at pin 14 for noise suppression. |
| GND | Ground reference | Common return for all channels and control logic; must be low-impedance to maintain ron consistency and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Standard 126-type pinout | Enables drop-in replacement of legacy 74-series bus switches without PCB redesign or footprint change. |
| 5 Ω switch resistance | Delivers <10 mV drop at 20 mA, preserving signal integrity in 3.3-V digital and mixed-signal applications. |
| Rail-to-rail I/O | Supports full 0–3.6 V analog/digital signal pass-through - eliminates need for external biasing or clamping networks. |
| Ioff partial-power-down | Prevents back-current flow when VCC = 0 V, allowing safe isolation of powered peripherals during system sleep or hot-swap events. |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II - ensures reliability in noisy industrial and datacenter environments with transient coupling. |
Applications
| Server Backplane Isolation | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Isolating JTAG debug ports between CPU and FPGA on multi-board server blades to prevent cross-talk and enable concurrent firmware updates. IC Role / Device Role / Timing Role: Bidirectional analog bus switch providing signal path control without introducing propagation delay or voltage offset. Use Value: Eliminates need for sequenced power-up; enables live insertion of compute modules while maintaining debug access to powered subsystems. |
Use Scenario: Routing SPI signals from a central controller to multiple modular I/O cards in programmable logic controllers with varying supply domains. IC Role / Device Role / Timing Role: Voltage-agnostic signal gate that passes clock/data/MOSI/MISO without level translation or timing skew. Use Value: Reduces BOM count by replacing discrete MOSFET arrays; simplifies layout with single 14-pin TVSOP instead of four discrete switches. |
| Motor Drive Communication Hub | Building Automation Sensor Network |
|
Use Scenario: Multiplexing CAN and RS-485 control lines between MCU and multiple motor inverters in variable-frequency drives. IC Role / Device Role / Timing Role: High-impedance isolation switch activated only during active communication bursts to reduce standby current and EMI. Use Value: Low 7 pF off-capacitance minimizes signal reflection on 1-Mbps differential buses; Ioff prevents ground loop currents during drive idle states. |
Use Scenario: Sharing a single 3.3-V microcontroller GPIO bank across temperature, occupancy, and lighting sensors in smart HVAC systems. IC Role / Device Role / Timing Role: Low-ron analog switch enabling time-division multiplexing of sensor outputs onto common ADC inputs. Use Value: 5 Ω ron introduces <0.1% gain error at 10 kΩ sensor impedance - preserves measurement accuracy without calibration overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3126PW | Same 126 pinout and 5 Ω ron, but rated only to 70°C ambient; TSSOP-14 package has larger footprint (5.00 × 4.40 mm) and higher RθJA (148.9°C/W). | Not qualified for extended industrial temperature range; unsuitable for enclosed enclosures without forced air. | Select SN74CBTLV3126DGVR when operating above 70°C or requiring lower thermal resistance in space-constrained designs. |
| SN74LVC1G3157DCKR | Single-channel variant in SC70-6; ron = 6 Ω at 3.3 V but lacks Ioff spec; maximum ambient = 85°C. | Requires four separate devices and additional PCB area; no guaranteed powered-off isolation behavior. | Choose SN74CBTLV3126DGVR for integrated quad-channel operation, proven Ioff protection, and reduced component count in multi-signal isolation. |
Compared with SN74CBT3126PW and SN74LVC1G3157DCKR, the SN74CBTLV3126DGVR delivers verified partial-power-down safety, superior thermal performance in compact TVSOP packaging, and guaranteed rail-to-rail operation across the full industrial temperature range - making it the optimal choice for mission-critical isolation where reliability and layout efficiency are prioritized.
Availability
SN74CBTLV3126DGVR is available at Aetrix Electronics and suitable for server backplane isolation, industrial PLC I/O expansion, and motor drive communication hubs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74CBTLV3126DGVR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and high-reliability interface solutions.
The SN74CBTLV3126 belongs to TI's low-voltage bus switch product line, designed specifically for high-fidelity signal routing in mixed-voltage systems where power sequencing, hot-swap capability, and minimal signal distortion are critical.
FAQ
What is the maximum continuous current rating per channel for the SN74CBTLV3126DGVR?
The SN74CBTLV3126DGVR supports up to 128 mA continuous channel current per switch, as specified in its Absolute Maximum Ratings table. This rating applies under recommended operating conditions (VCC = 2.3–3.6 V, TA = –40°C to 85°C) and ensures reliable conduction without thermal runaway or parametric shift. Exceeding this current may degrade ron stability or trigger latch-up.
Does the SN74CBTLV3126DGVR support 1.8-V logic-level control inputs?
Yes, the SN74CBTLV3126DGVR supports 1.8-V compatible control inputs: its VIL (low-level input voltage) is 0.7 V minimum at VCC = 2.3–2.7 V, and VIH (high-level input voltage) is 1.7 V minimum at the same supply range. This allows direct interfacing with 1.8-V microcontrollers without level-shifting circuitry.
How does the Ioff feature of the SN74CBTLV3126DGVR protect downstream circuits during power-down?
The Ioff feature limits leakage current to ≤10 µA when VCC = 0 V and any I/O port is biased between 0–3.6 V. This prevents damaging back-current flow from powered peripherals into the unpowered SN74CBTLV3126DGVR, ensuring safe isolation during hot-swap, sleep mode, or partial system shutdown - a requirement validated per JESD 78 Class II.
Can the SN74CBTLV3126DGVR be used to switch analog sensor signals?
Yes, the SN74CBTLV3126DGVR is suitable for analog sensor signal routing due to its rail-to-rail I/O capability (0–3.6 V), low 7 pF off-capacitance, and flat 5–8 Ω on-resistance across input voltage. It preserves signal fidelity for DC-coupled sensors like RTDs or potentiometers, provided channel current remains within 128 mA and bandwidth requirements stay below ~1 GHz.
What is the thermal resistance (RθJA) of the SN74CBTLV3126DGVR in its TVSOP-14 package?
The SN74CBTLV3126DGVR in TVSOP-14 (DGV) package has a junction-to-ambient thermal resistance (RθJA) of 154.8°C/W, as measured per JEDEC JESD51 standards. This value assumes standard 2-layer PCB layout with no thermal vias; adding copper pour and thermal vias beneath the exposed pad can reduce effective RθJA by up to 30%.
SN74CBTLV3126DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 14-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-TVSOP
SN74CBTLV3126DGVR FAQ
1.How can I place an order for SN74CBTLV3126DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3126DGVR 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 SN74CBTLV3126DGVR reliable?
The price and inventory of SN74CBTLV3126DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3126DGVR is usually 5 days.
3.What payment methods are accepted for SN74CBTLV3126DGVR?
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4.How is shipping managed for SN74CBTLV3126DGVR?
SN74CBTLV3126DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3126DGVR 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 SN74CBTLV3126DGVR?
For technical support, including SN74CBTLV3126DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3126DGVR requirements.
6.How does Aetrix verify that SN74CBTLV3126DGVR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3126DGVR 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 SN74CBTLV3126DGVR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3126DGVR?
All SN74CBTLV3126DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3126DGVR, 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 SN74CBTLV3126DGVR part is unused and in its original packaging.
Return procedure for SN74CBTLV3126DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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