My Inquiry
My Account
Texas Instruments SN74CBTLV3126D
- Part No.:
- SN74CBTLV3126D
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTLV3126D.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:395
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CBTLV3126D 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 in protocol isolation (JTAG/SPI/GPIO) within enterprise computing and wired networking systems.
For engineers reviewing the SN74CBTLV3126D datasheet, SN74CBTLV3126D pinout, SN74CBTLV3126D application, or SN74CBTLV3126D equivalent, key selection criteria include on-resistance ≤8Ω at 3.3V, 14-pin SOIC package compatibility, Ioff leakage ≤10µA at VCC = 0V, and guaranteed operation across industrial temperature range without power sequencing.
Technical Context
The SN74CBTLV3126D implements four independent bidirectional FET switches, each controlled by a dedicated active-high output-enable (OE) input. Each switch connects A and B ports with sub-8Ω on-resistance and supports full rail-to-rail voltage swing (0V to VCC) on both sides.
Its Ioff feature actively blocks current backflow when VCC = 0V, enabling hot-swap and live-insertion use cases. The device achieves >100mA latch-up immunity per JESD78 Class II and maintains high-impedance isolation during power-up/down when OE is pulled to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (ron) | 5Ω typical, ≤8Ω max at VCC = 3.3V, 64mA - ensures minimal signal attenuation and voltage drop in high-speed data paths. |
| Supply voltage (VCC) | 2.3V to 3.6V - compatible with 2.5V and 3.3V logic domains without level translation. |
| Ioff leakage | ≤10µA at VCC = 0V, VI/VO = 0–3.6V - prevents damaging back-current during partial power-down. |
| Propagation delay (tpd) | 0.15–0.25ns - enables <1GHz signal routing with negligible timing impact in bus-switching applications. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded and networking equipment. |
| ESD rating (HBM) | ±2000V - meets standard handling requirements for automated assembly and field deployment. |
| Input capacitance (Ci) | 2.5pF - minimizes loading on driving sources and preserves signal integrity in high-frequency traces. |
Pinout & Package
SN74CBTLV3126D is packaged in a 14-pin SOIC (D) package measuring 8.65mm × 3.91mm, with gull-wing leads and standard JEDEC MS-012AC footprint. Thermal pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-high enable inputs | Individually control switch conduction; OE = low disables corresponding A–B path into high-Z state. |
| 1A–4A, 1B–4B | Bidirectional I/O channels | Each pair forms a low-resistance, rail-to-rail analog path; no directionality or internal buffering. |
| VCC (Pin 14) | Power supply | Single 2.3–3.6V supply powers all four switches and logic; decoupling capacitor required. |
| GND (Pin 7) | Reference ground | Common return for all signals and supply; must be low-impedance connection for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 5Ω switch resistance | Enables low-loss signal routing for high-speed digital buses (e.g., SPI clock/data lines up to 200MHz). |
| Rail-to-rail I/O | Supports full 0V–VCC voltage swing on both A and B ports-eliminates need for external level shifters in mixed-voltage systems. |
| Ioff partial-power-down | Guarantees <10µA back-current when unpowered-enables safe hot-plug of peripheral modules without system reset. |
| Standard 126-type pinout | Direct drop-in replacement for legacy 74-series bus switches (e.g., SN74CBT3126), simplifying board redesign. |
| JESD78 Class II latch-up | Withstands >100mA transient stress-ensures robustness in noisy industrial environments with ESD or surge events. |
Applications
| Protocol Isolation | Hot-Swap Peripheral Interface |
|---|---|
Use Scenario: Isolating JTAG debug, SPI flash, or GPIO control lines between host processor and removable daughter cards in modular servers. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling signal paths without introducing propagation delay or logic inversion. Use Value: Eliminates need for power sequencing during card insertion/removal; maintains signal integrity with <0.25ns tpd and 5Ω ron. |
Use Scenario: Enabling live insertion of network interface modules in enterprise switches while main system remains powered. IC Role / Device Role / Timing Role: Ioff-protected bus switch providing galvanic isolation between powered and unpowered subsystems. Use Value: Prevents backfeed current from hot-swapped module into main board's VCC rail, avoiding brownouts or latch-up. |
| Data Center Backplane Switching | Industrial I/O Multiplexing |
Use Scenario: Routing sensor data or control signals across shared backplane traces in rack-mounted compute nodes. IC Role / Device Role / Timing Role: Low-capacitance (2.5pF Ci), low-resistance switch minimizing crosstalk and skew across parallel bus segments. Use Value: Supports clean 100+MHz signal transmission with <7pF Cio(OFF) in disabled state-reducing inter-channel interference. |
Use Scenario: Sharing limited MCU GPIO pins among multiple sensors, actuators, or communication peripherals in building automation controllers. IC Role / Device Role / Timing Role: Independent channel enables time-multiplexed access to isolated analog/digital resources without software overhead. Use Value: Reduces BOM count vs discrete switches; 4-channel integration lowers PCB area and improves thermal uniformity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3126DR | Same silicon die, identical electrical specs, 14-pin SOIC package with tape-and-reel packaging (2500 pcs/reel). | Identical functional use; differs only in packaging format and orderable part number suffix. | Select SN74CBTLV3126DR for volume production requiring reel delivery; SN74CBTLV3126D is obsolete but may exist in legacy inventory. |
| SN74CBTLV3126DGVR | Same functionality and specs, but in 14-pin TVSOP (DGV) package (3.60mm × 4.40mm), with Level-1 MSL rating. | Smaller footprint and finer pitch; better suited for space-constrained designs where SOIC is too large. | Choose SN74CBTLV3126DGVR when board real estate is critical and reflow profile supports TVSOP; verify thermal derating (RθJA = 154.8°C/W). |
Compared with SN74CBTLV3126D, SN74CBTLV3126DR offers identical performance in production-ready packaging, while SN74CBTLV3126DGVR trades larger thermal resistance for 45% smaller footprint-making it preferable for density-optimized layouts despite higher junction temperature rise under load.
Availability
SN74CBTLV3126D is available at Aetrix Electronics and suitable for enterprise computing, wired networking, and building automation applications requiring stable component supply and long-term industrial temperature support.
Supply support for SN74CBTLV3126D 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 SN74CBTLV3126D belongs to TI's CBTLV (low-voltage BiCMOS transistor logic) bus switch family, designed specifically for high-speed, low-distortion signal routing in 2.5V/3.3V systems with stringent power-down safety requirements.
FAQ
What is the maximum operating temperature for SN74CBTLV3126D?
The SN74CBTLV3126D is rated for operation from –40°C to +85°C ambient temperature. This specification applies to the SOIC (D) package variant and is validated per JEDEC JESD22-A104. Operation beyond 85°C requires thermal derating analysis using RθJA = 123.0°C/W and board-level cooling validation.
Does SN74CBTLV3126D support true bidirectional signal flow?
Yes, SN74CBTLV3126D provides fully bidirectional analog switching: each A–B channel conducts equally in either direction with identical 5Ω typical on-resistance and rail-to-rail voltage handling. No internal direction control or biasing is required-signal polarity and source/sink roles are determined entirely by external circuitry.
Can SN74CBTLV3126D be used with 1.8V logic interfaces?
SN74CBTLV3126D does not operate from a 1.8V supply, but its rail-to-rail I/O supports 1.8V signal levels when VCC = 2.3–3.6V. Input thresholds (VIH ≥ 1.7V at VCC = 2.3V) and output swing (0V to VCC) ensure interoperability with 1.8V CMOS drivers and receivers without level shifters.
How is Ioff protection implemented in SN74CBTLV3126D?
SN74CBTLV3126D uses integrated FET gate control that forces all channel transistors into cutoff when VCC = 0V, limiting back-current to ≤10µA even with up to 3.6V applied to any I/O pin. This behavior is tested per JESD78 and eliminates need for external blocking diodes in hot-swap architectures.
Is SN74CBTLV3126D pin-compatible with older 74-series bus switches?
Yes, SN74CBTLV3126D uses the standard 126-type pinout defined in TI's 74CBT3126 and industry-standard 14-pin SOIC layout. Pin assignments for OE, A/B channels, VCC, and GND match exactly-enabling direct PCB replacement without layout changes when upgrading from bipolar or older CMOS bus switches.
SN74CBTLV3126D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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-SOIC
SN74CBTLV3126D FAQ
1.How can I place an order for SN74CBTLV3126D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3126D 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 SN74CBTLV3126D reliable?
The price and inventory of SN74CBTLV3126D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3126D is usually 5 days.
3.What payment methods are accepted for SN74CBTLV3126D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTLV3126D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBTLV3126D?
SN74CBTLV3126D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3126D 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 SN74CBTLV3126D?
For technical support, including SN74CBTLV3126D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3126D requirements.
6.How does Aetrix verify that SN74CBTLV3126D is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3126D 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 SN74CBTLV3126D meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3126D?
All SN74CBTLV3126D units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3126D, 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 SN74CBTLV3126D part is unused and in its original packaging.
Return procedure for SN74CBTLV3126D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CBTLV3126D Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
