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Texas Instruments SN74CBTLV3126RGYR
- Part No.:
- SN74CBTLV3126RGYR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
SN74CBTLV3126RGYR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:56,342
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Product details
Overview
SN74CBTLV3126 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-0.25ns propagation delay at 3.3V, and isolates ports during power-off-used for protocol isolation in JTAG/SPI interconnects within enterprise servers and industrial controllers.
For engineers reviewing the SN74CBTLV3126 datasheet, SN74CBTLV3126 pinout, SN74CBTLV3126 application, or SN74CBTLV3126 equivalent, key selection criteria include on-resistance matching across channels, thermal performance in VQFN (RGY) package, Ioff leakage under 10µA at 0V VCC, and OE-controlled channel enable/disable timing.
Technical Context
The SN74CBTLV3126 implements four independent bidirectional analog switches using NMOS pass transistors with integrated gate control logic. Each channel connects A and B ports when its dedicated OE input is high, and presents >10⁹Ω isolation when OE is low or VCC = 0V.
Its Ioff architecture blocks backflow current during partial power-down by disabling all transistor channels when VCC drops below threshold, ensuring robustness in hot-swap systems. Rail-to-rail operation supports full 0–3.3V signal swing without level translation, and latch-up immunity exceeds 100mA per JESD 78 Class II.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5Ω typical at 3.3V/64mA - ensures minimal voltage drop and signal attenuation in high-speed data paths |
| Propagation delay (tpd) | 0.15–0.25ns at 3.3V - enables clean switching for >2GHz digital signals without timing skew |
| Ioff leakage | 10µA max at VCC = 0V - guarantees safe isolation during system power sequencing or standby |
| Supply voltage range | 2.3V to 3.6V - compatible with 2.5V and 3.3V logic domains without external level shifters |
| Operating temperature | –40°C to +85°C - validated for industrial and enterprise computing environments |
| ESD rating (HBM) | ±2000V - meets standard handling requirements for automated assembly and field service |
| Channel count | 4 independent bidirectional switches - supports parallel isolation of JTAG, SPI, or GPIO buses |
Pinout & Package
VQFN-14 (RGY) package: 4.00mm × 3.50mm body with exposed thermal pad; pin pitch 0.5mm; RoHS-compliant NiPdAu finish; MSL Level-1 (260°C, unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-high enable inputs | Individually control each switch; pull low to isolate A–B path; require no external pull-down if driven actively |
| 1A–4A, 1B–4B | Bidirectional I/O terminals | Pass signals in either direction when enabled; support rail-to-rail 0–3.3V swing with <5Ω resistance |
| VCC | Power supply | Single 2.3–3.6V supply powers all switches and internal logic; bypass with 0.1µF capacitor near pin |
| GND | Ground reference | Return path for all channels and control logic; must connect to solid ground plane for EMI control |
| Thermal Pad | Exposed copper pad | Not required to be soldered; if connected, must be left floating or tied to GND to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| 5Ω on-state resistance | Minimizes insertion loss and maintains signal integrity in high-speed digital interconnects up to 2Gbps |
| Rail-to-rail switching | Supports full 0–3.3V logic swing without clamping or distortion-critical for mixed-voltage system partitioning |
| Ioff partial-power-down | Prevents damaging back-current flow when VCC = 0V, enabling safe hot-swap and live-insertion in modular systems |
| Standard 126-type pinout | Ensures drop-in compatibility with legacy SN74CBT and SN74LV families for design reuse and migration |
| Latch-up immunity | Exceeds 100mA per JESD 78 Class II-guarantees robust operation in noisy industrial power environments |
Applications
| Server Backplane Interconnect | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating JTAG debug interfaces between CPU module and hot-swappable mezzanine cards in 1U rack servers. IC Role / Device Role / Timing Role: Bidirectional signal switch enabling secure, low-latency access to FPGA/CPU boundary scan chains without affecting main data lanes. Use Value: Eliminates need for sequenced power-up and prevents backfeed during card removal-reducing firmware complexity and improving MTBF. |
Use Scenario: Multiplexing SPI communication between a central controller and multiple remote I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Channel-selectable bus switch routing sensor/actuator commands while maintaining electrical isolation between zones. Use Value: Enables deterministic 0.25ns-per-channel timing control and withstands 100mA latch-up events common in motor drive noise environments. |
| Enterprise Storage Controller | Building Management System Hub |
Use Scenario: Switching SMBus or I²C control lines between RAID controller ASIC and redundant fan/power modules. IC Role / Device Role / Timing Role: Low-capacitance (7pF OFF) analog switch preserving rise/fall times under 10ns for 400kHz bus compliance. Use Value: Maintains signal fidelity across 3.3V bus segments while supporting fail-safe shutdown via Ioff during thermal fault conditions. |
Use Scenario: Isolating RS-485 transceiver enable lines and GPIO status indicators across HVAC zone controllers in smart buildings. IC Role / Device Role / Timing Role: Quad-channel switch managing bi-directional control signaling between microcontroller and distributed sensor nodes. Use Value: Provides 5Ω ON resistance for minimal voltage drop on 24V-tolerant logic interfaces and supports –40°C cold-start operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245RGYR | Octal configuration, 3-state outputs, higher ICC (20µA), same RON and tpd specs | Used where 8-channel isolation is needed instead of 4; requires additional OE logic for channel grouping | Select when expanding bus width beyond 4 lanes while retaining identical VQFN footprint and thermal profile |
| SN74LVC1G3157DCKR | Single-channel, smaller SC70-6 package, higher RON (6.5Ω typ), wider VCC range (1.65–5.5V) | Suitable for point-of-load signal gating rather than parallel bus isolation | Choose for space-constrained designs needing discrete channel control-not for quad-bus consolidation |
Compared with SN74CBTLV3126, SN74CBTLV3245RGYR offers double channel count in same RGY package but lacks independent OE per channel, while SN74LVC1G3157DCKR provides broader voltage support in minimal area but cannot replace quad-channel functionality without four discrete units.
Availability
SN74CBTLV3126 is available at Aetrix Electronics and suitable for enterprise server backplanes, industrial PLC I/O expansion, and building management system hubs requiring stable component supply across extended product lifecycles.
Supply support for SN74CBTLV3126 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 SN74CBTLV3126 belongs to TI's CBTLV logic family, engineered for ultra-low on-resistance and fast switching in high-density digital interconnects-targeting datacenter, networking, and real-time control applications.
FAQ
What is the maximum operating temperature for SN74CBTLV3126 in the RGY package?
The SN74CBTLV3126 in VQFN (RGY) package is rated for operation from –40°C to +85°C ambient temperature. This specification is validated per JEDEC JESD51 thermal testing standards and applies to all RGY-orderable variants including SN74CBTLV3126RGYR. Operation beyond 85°C ambient requires derating based on PCB layout and airflow.
Does SN74CBTLV3126 support true bidirectional signal flow?
Yes, SN74CBTLV3126 supports fully bidirectional signal flow on each A–B channel. Its FET-based architecture imposes no directionality-signals pass equally well from A to B or B to A when OE is high. This enables use in JTAG TDI/TDO, SPI MOSI/MISO, and GPIO sharing applications without polarity constraints.
How does the Ioff feature protect SN74CBTLV3126 during partial power-down?
The Ioff feature in SN74CBTLV3126 disables all internal FET channels when VCC drops to 0V, limiting leakage current to ≤10µA regardless of voltage applied to A/B pins. This prevents back-current damage to powered-down sections of a system-critical for hot-swap PCIe add-in cards and modular server architectures where subsystems power up/down independently.
Can SN74CBTLV3126 replace older 74CBT3126 devices in existing designs?
Yes, SN74CBTLV3126 is pin-compatible with SN74CBT3126 in SOIC, TSSOP, and TVSOP packages and shares the standard 126-type pinout. However, SN74CBTLV3126 operates at lower voltage (2.3–3.6V vs. 4.5–5.5V) and offers improved RON (5Ω vs. 7Ω) and lower ICC. Verify VCC domain compatibility before drop-in replacement.
What is the recommended decoupling for SN74CBTLV3126RGYR?
Texas Instruments specifies a 0.1µF ceramic capacitor placed as close as possible to the VCC pin of SN74CBTLV3126RGYR, with short, low-inductance traces to the GND plane. For multi-layer PCBs, route the capacitor directly to an internal solid ground plane. Avoid shared vias or daisy-chained decoupling to maintain signal integrity in high-speed switching paths.
SN74CBTLV3126RGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 14-VFQFN Exposed Pad
- 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-VQFN (3.5x3.5)
SN74CBTLV3126RGYR FAQ
1.How can I place an order for SN74CBTLV3126RGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3126RGYR 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 SN74CBTLV3126RGYR reliable?
The price and inventory of SN74CBTLV3126RGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3126RGYR is usually 5 days.
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SN74CBTLV3126RGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3126RGYR 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 SN74CBTLV3126RGYR?
For technical support, including SN74CBTLV3126RGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3126RGYR requirements.
6.How does Aetrix verify that SN74CBTLV3126RGYR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3126RGYR 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 SN74CBTLV3126RGYR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3126RGYR?
All SN74CBTLV3126RGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3126RGYR, 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 SN74CBTLV3126RGYR part is unused and in its original packaging.
Return procedure for SN74CBTLV3126RGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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