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Texas Instruments SN74CBTLV3126DBQR
- Part No.:
- SN74CBTLV3126DBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTLV3126DBQR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,468
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Product details
Overview
SN74CBTLV3126DBQR 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 and supports hot-swap isolation in enterprise computing backplanes and protocol multiplexing for JTAG/SPI GPIO routing.
For engineers reviewing the SN74CBTLV3126DBQR datasheet, SN74CBTLV3126DBQR pinout, SN74CBTLV3126DBQR application, or SN74CBTLV3126DBQR equivalent, key selection criteria include on-resistance stability across voltage range, guaranteed isolation during power-off, thermal performance in SSOP-16, and compatibility with 1.8-V/3.3-V mixed-signal systems.
Technical Context
The SN74CBTLV3126DBQR implements four independent bidirectional FET switches, each controlled by a dedicated active-high OE input. Switch conduction is governed by MOSFET channel resistance, not logic-level translation - enabling true analog pass-through of DC to >100 MHz signals without level shifting.
Its Ioff specification (≤10 µA at VCC = 0 V) ensures no backflow current when unpowered, while latch-up immunity (>100 mA per JESD 78 Class II) guarantees robustness in noisy industrial environments. The device maintains high-impedance isolation during power-up/down sequences when OE is pulled low via external resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (ron) | 5 Ω typical at VCC = 3.3 V, 64 mA - enables <10 mV drop across switch under full load, preserving signal integrity in high-speed data paths. |
| Supply voltage range | 2.3 V to 3.6 V - compatible with 2.5-V and 3.3-V system rails; excludes 1.8-V-only operation without level shifters. |
| Ioff leakage | ≤10 µA at VCC = 0 V - prevents damaging backfeed from live buses into unpowered subsystems during hot insertion. |
| Signal voltage range | 0 V to VCC (rail-to-rail) - supports full-swing digital and analog signals including 1.8-V logic levels when VCC ≥ 1.8 V. |
| Operating temperature | –40 °C to +85 °C - qualified for commercial/industrial ambient conditions; not rated for extended 125 °C operation like DYY/BQA variants. |
| Propagation delay (tpd) | 0.15–0.25 ns at VCC = 2.5 V - sub-nanosecond switching enables use in >1 GHz data paths with minimal timing skew. |
| ESD rating (HBM) | ±2000 V - meets JEDEC JS-001 Class 2, supporting safe handling in standard assembly lines without special ESD controls. |
Pinout & Package
SN74CBTLV3126DBQR uses a 16-pin SSOP (DBQ) package measuring 4.90 mm × 3.90 mm with exposed pad option not present. Pin spacing is 0.65 mm; body thickness is 1.75 mm. Thermal resistance RθJA = 118.7 °C/W enables moderate power dissipation without forced cooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4, 6, 9, 10, 12, 13, 14 | I/O (1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B) | Bidirectional analog/digital signal ports - no internal directionality; signal flows A↔B when enabled. |
| 2, 5, 11, 15 | Input (1OE, 2OE, 3OE, 4OE) | Active-high enable controls - each independently gates one switch pair; floating state disables switch. |
| 8 | GND | Reference ground for all I/O and control signals; must be low-impedance connection to minimize noise coupling. |
| 16 | VCC | Single positive supply (2.3–3.6 V); powers internal FET bias circuitry and defines signal swing limits. |
| 9 (NC) | No connect | Internally unconnected pin - must remain unconnected on PCB; no routing or grounding permitted. |
Key Features
| Feature | Design Value |
|---|---|
| 5 Ω on-resistance | Ensures minimal voltage drop and signal attenuation across all four channels, critical for maintaining eye diagram integrity in high-speed serial links. |
| Rail-to-rail I/O | Supports full 0–VCC signal swing without clamping or distortion, enabling transparent interface between mixed-voltage domains (e.g., 1.8-V MCU ↔ 3.3-V peripheral). |
| Ioff partial-power-down | Guarantees <10 µA leakage when VCC = 0 V, allowing safe hot-plug operation in modular systems without power sequencing constraints. |
| Standard 126-type pinout | Enables drop-in replacement for legacy 74-series bus switches (e.g., SN74CBT3126) in existing layouts with no PCB redesign. |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II - eliminates risk of destructive latch-up during transient overvoltage events in motor drive or industrial I/O applications. |
Applications
| Enterprise Server Backplane | JTAG/SPI Protocol Isolation |
|---|---|
|
Use Scenario: Multiplexing debug and configuration signals across multiple CPU modules sharing a single JTAG chain in a 1U rack server. IC Role / Device Role / Timing Role: Bidirectional signal gate that isolates inactive modules while passing TCK/TMS/TDI/TDO with sub-0.25 ns propagation delay and zero added jitter. Use Value: Eliminates need for separate JTAG controllers per module, reducing BOM cost and board space while enabling firmware updates without system reboot. |
Use Scenario: Enabling dynamic reconfiguration of SPI peripherals (flash, sensors, DACs) on an industrial PLC mainboard without resetting the host MCU. IC Role / Device Role / Timing Role: Low-Ron analog switch providing glitch-free signal path selection between shared SPI bus and up to four peripheral devices. Use Value: Achieves <5 Ω channel resistance and rail-to-rail operation, preserving rise/fall times and minimizing setup/hold margin loss in 25-MHz SPI transfers. |
| Data Center Hot-Swap Module | Building Automation Controller |
|
Use Scenario: Isolating PCIe reference clocks and SMBus control lines between a hot-swappable GPU card and motherboard during insertion/removal. IC Role / Device Role / Timing Role: Power-fail-safe bus switch that maintains high-Z state when VCC is absent, preventing backdrive into powered-down subsystems. Use Value: Leverages Ioff ≤10 µA to meet IEC 61000-4-2 Level 4 ESD immunity requirements without external protection diodes or complex power sequencing. |
Use Scenario: Routing sensor inputs (temperature, occupancy, CO₂) and actuator outputs (valve drivers, relay controls) through a centralized HVAC controller with field-replaceable I/O cards. IC Role / Device Role / Timing Role: Robust analog/digital signal switch rated for –40 °C to +85 °C operation and immune to latch-up in electrically noisy building environments. Use Value: Delivers >100 mA latch-up immunity per JESD 78 Class II, ensuring reliability against induced transients from nearby AC motors and solenoids. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3126DGVR | TVSOP-14 package (3.60 mm × 4.40 mm); RθJA = 154.8 °C/W; same electrical specs but lower thermal performance and no NC pin. | Better suited for space-constrained PCBs where footprint area matters more than thermal headroom; lacks NC pin for simplified layout verification. | Select DGVR for ultra-dense routing; choose DBQR when thermal margin or pin-count consistency with legacy 16-pin designs is required. |
| SN74CBTLV3126PWR | TSSOP-14 package (5.00 mm × 4.40 mm); RθJA = 148.9 °C/W; identical switching specs but slightly larger footprint than DGVR. | Offers higher creepage/clearance for industrial safety compliance; preferred in designs requiring IPC-2221 Class B spacing. | Choose PWR for enhanced isolation in mains-connected equipment; DBQR remains optimal for cost-sensitive commercial servers. |
Compared with SN74CBTLV3126DGVR and SN74CBTLV3126PWR, the SN74CBTLV3126DBQR provides superior thermal resistance (118.7 °C/W vs. ≥148.9 °C/W), a dedicated NC pin for layout validation, and mechanical compatibility with legacy 16-pin socket footprints - making it the preferred choice for thermally demanding, high-reliability server and industrial control applications.
Availability
SN74CBTLV3126DBQR is available at Aetrix Electronics and suitable for enterprise server backplanes, industrial PLC I/O modules, and building automation controllers requiring stable component supply across multi-year production cycles.
Supply support for SN74CBTLV3126DBQR 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 components.
The SN74CBTLV3126DBQR belongs to TI's CBTLV low-voltage FET switch family, engineered for high-speed, low-distortion signal routing in datacenter, industrial, and communications infrastructure where power efficiency and signal fidelity are critical.
FAQ
What is the maximum operating temperature for SN74CBTLV3126DBQR?
The SN74CBTLV3126DBQR is specified for operation from –40 °C to +85 °C ambient temperature. This rating applies specifically to the DBQ (SSOP-16) package variant and is validated per JEDEC JESD22-A104. Operation beyond +85 °C is not guaranteed and may result in increased on-resistance drift or Ioff leakage exceeding 10 µA.
Does SN74CBTLV3126DBQR support 1.8-V logic levels?
Yes, the SN74CBTLV3126DBQR supports 1.8-V logic levels when powered with VCC ≥ 2.3 V. Its rail-to-rail I/O architecture allows signals from 0 V to VCC, so a 1.8-V input applied to any A/B port will pass through undistorted as long as VCC is within 2.3–3.6 V. Control inputs (OE) require VIH ≥ 1.7 V at VCC = 2.3 V.
How does the Ioff feature work in SN74CBTLV3126DBQR?
The Ioff feature in SN74CBTLV3126DBQR disables internal FET conduction paths when VCC = 0 V, limiting leakage current to ≤10 µA even if live signals (0–3.6 V) are present on A/B ports. This prevents backdrive damage to unpowered downstream circuits and enables true hot-swap capability without external power sequencing hardware.
Can SN74CBTLV3126DBQR replace older 74CBT3126 devices?
Yes, SN74CBTLV3126DBQR is pin-compatible with SN74CBT3126DBQR in the same SSOP-16 package and shares the standard 126-type pinout. However, it operates at lower voltage (2.3–3.6 V vs. 4.5–5.5 V) and offers improved on-resistance (5 Ω vs. ~7 Ω) and Ioff protection - requiring VCC rail adjustment but delivering better signal integrity.
What is the purpose of the NC pin on SN74CBTLV3126DBQR?
Pin 9 on SN74CBTLV3126DBQR is a no-connect (NC) terminal with no internal bond wire or silicon connection. It serves as a physical placeholder for layout verification, mechanical alignment, or future package revision flexibility. It must remain unconnected on the PCB - neither routed nor grounded - to avoid unintended parasitic coupling or EMI effects.
SN74CBTLV3126DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 16-SSOP (0.154", 3.90mm 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:
- 16-SSOP
SN74CBTLV3126DBQR FAQ
1.How can I place an order for SN74CBTLV3126DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3126DBQR 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 SN74CBTLV3126DBQR reliable?
The price and inventory of SN74CBTLV3126DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3126DBQR is usually 5 days.
3.What payment methods are accepted for SN74CBTLV3126DBQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTLV3126DBQR transactions.
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4.How is shipping managed for SN74CBTLV3126DBQR?
SN74CBTLV3126DBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3126DBQR 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 SN74CBTLV3126DBQR?
For technical support, including SN74CBTLV3126DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3126DBQR requirements.
6.How does Aetrix verify that SN74CBTLV3126DBQR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3126DBQR 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 SN74CBTLV3126DBQR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3126DBQR?
All SN74CBTLV3126DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3126DBQR, 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 SN74CBTLV3126DBQR part is unused and in its original packaging.
Return procedure for SN74CBTLV3126DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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