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Texas Instruments SN74CBT3126PW
- Part No.:
- SN74CBT3126PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3126PW.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,793
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Product details
Overview
SN74CBT3126PW from Texas Instruments is a quadruple FET bus switch IC used for high-speed, low-distortion signal routing in digital logic interfaces. It features four independent 5-Ω bidirectional switches, TTL-compatible control inputs, and operates from 4 V to 5.5 V supply. Each switch disconnects when its OE input is low, enabling precise bus isolation in memory address/data paths and I/O expansion circuits.
For engineers reviewing the SN74CBT3126PW datasheet, SN74CBT3126PW pinout, SN74CBT3126PW application, or SN74CBT3126PW equivalent, key selection criteria include on-state resistance (5–7 Ω), propagation delay (≤0.35 ns at VCC = 4 V), latch-up immunity (>250 mA), thermal impedance (113°C/W), and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
This device implements four independent NMOS transmission gate switches with no internal pull-ups or level-shifting circuitry. Each channel supports bidirectional signal flow between A and B ports under active-high OE control, with guaranteed high-impedance state during power sequencing when OE is tied to GND via pulldown resistor.
It complies with JESD 17 latch-up specifications and supports rail-to-rail analog/digital signal switching up to 128 mA continuous channel current. Input clamp current rating of −50 mA and VI/O range of −0.5 V to 7 V allow robust handling of undershoot/overshoot transients in mixed-signal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V, ensuring minimal voltage drop and signal attenuation in high-speed data paths. |
| Propagation delay (tpd) | ≤0.35 ns at VCC = 4 V, CL = 50 pF - enables sub-nanosecond timing integrity in 100+ MHz bus applications. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed 3.3/5-V system interfaces without level shifters. |
| Latch-up immunity | >250 mA per JESD 17 - guarantees robust operation in noisy industrial or hot-plug environments. |
| Input voltage range (VI) | −0.5 V to 7 V - accommodates transient excursions beyond rails without damage or false triggering. |
| Thermal impedance (θJA) | 113°C/W for PW package - defines maximum power dissipation limit (~30 mW) under natural convection. |
| Control input leakage (II) | ±1 μA at VCC = 5.5 V - ensures negligible loading on upstream drivers and stable OE logic thresholds. |
Pinout & Package
TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, 1.2 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Independent output-enable inputs | Active-high control signals; each disables its associated switch when low, enabling per-channel bus gating. |
| 1A–4A, 1B–4B | Bidirectional signal terminals | Paired A/B ports form four independent transmission paths; no directionality - signal flows either way when enabled. |
| GND (Pin 7) | Ground reference | Common return path for all switches and control logic; must be low-impedance for noise immunity and latch-up prevention. |
| VCC (Pin 8) | Power supply | Single 4–5.5 V supply powers all four switches and input buffers; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Minimizes insertion loss and timing skew across all four channels, critical for parallel bus integrity. |
| TTL-compatible input levels | VIH = 2 V min, VIL = 0.8 V max - allows direct interfacing with legacy 5-V microcontrollers and FPGAs without translators. |
| High-impedance state on power-up | OE tied to GND via pulldown ensures default isolation - prevents bus contention during system boot or brownout. |
| 128 mA continuous channel current | Supports driving multiple CMOS loads or short traces without derating, suitable for backplane and motherboard routing. |
| −0.5 V to 7 V input voltage tolerance | Enables safe operation with overshoot/undershoot events common in fast-switching digital systems. |
Applications
| Memory Address/Data Bus Isolation | Hot-Swap I/O Expansion |
|---|---|
|
Use Scenario: Isolating CPU address/data lines from peripheral modules during dynamic reconfiguration. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling/disabling signal paths without direction control logic. Use Value: Prevents bus contention and data corruption when adding/removing daughter cards or memory banks in real time. |
Use Scenario: Enabling safe insertion/removal of I/O interface cards in industrial PLC backplanes. IC Role / Device Role / Timing Role: Per-port enable-controlled isolation barrier between live backplane and unpowered module. Use Value: Eliminates need for complex power sequencing; OE pins synchronized with card detect signals ensure zero-current hot-swap. |
| FPGA Configuration Interface Multiplexing | Legacy Peripheral Interfacing |
|
Use Scenario: Sharing FPGA configuration pins (e.g., JTAG, SPI) among multiple devices on a shared header. IC Role / Device Role / Timing Role: Low-latency, bidirectional signal selector with sub-ns propagation delay. Use Value: Enables single FPGA to program multiple flash memories or configure multiple FPGAs without external mux logic. |
Use Scenario: Connecting modern microcontrollers to legacy 5-V peripherals (e.g., LCD controllers, DACs). IC Role / Device Role / Timing Role: Voltage-tolerant, low-Ron bus switch preserving signal rise/fall times. Use Value: Avoids level-shifters while maintaining full 5-V logic swing and timing margins for reliable communication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PW | Octal configuration, higher on-resistance (7–10 Ω), supports 3.3-V and 5-V mixed-mode operation. | Suitable for wider buses requiring eight channels; not drop-in due to different pin count and control architecture. | Choose when expanding to 8-bit data paths or needing dual-supply translation capability. |
| 74LVC1G3157DP | Single-pole double-throw (SPDT) analog switch, 5-V tolerant, 6 Ω typical Ron, SC-70-6 package. | Provides signal routing flexibility (A-to-B1/B2) but lacks quad independent enables and bus topology. | Select for compact, single-channel analog/digital multiplexing where space is constrained and per-channel gating is unnecessary. |
Compared with SN74CBT3126PW, SN74CBTD3384PW offers greater channel density at the cost of higher Ron and larger footprint, while 74LVC1G3157DP trades quad independence for ultra-small size and SPDT functionality - neither is pin-compatible, but both serve adjacent routing needs in logic and mixed-signal designs.
Availability
SN74CBT3126PW is available at Aetrix Electronics and suitable for memory bus isolation, hot-swap I/O expansion, and FPGA configuration multiplexing requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT3126PW 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 decades of expertise in high-reliability logic and interface solutions.
The SN74CBT3126PW belongs to the CBT (Crosspoint Bus Transceiver) family, designed specifically for low-latency, low-distortion digital signal routing in high-speed computing, industrial control, and communications infrastructure.
FAQ
What is the maximum operating temperature range for the SN74CBT3126PW?
The SN74CBT3126PW is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in demanding environments such as factory automation controllers, network equipment, and automotive infotainment head units where thermal cycling and extended temperature exposure occur.
Does the SN74CBT3126PW require external pull-up or pull-down resistors on its OE pins?
Yes - to guarantee high-impedance state during power-up or power-down, each OE pin of the SN74CBT3126PW must be tied to GND through a pulldown resistor. The minimum value depends on the driver's current-sourcing capability, but typical values range from 1 kΩ to 10 kΩ for robust noise immunity and fast turn-off.
Can the SN74CBT3126PW be used to switch analog signals like audio or sensor outputs?
Yes - the SN74CBT3126PW supports bidirectional analog signal switching up to its 128 mA continuous channel current and −0.5 V to 7 V input voltage range. Its 5–7 Ω on-resistance and low charge injection make it suitable for DC-coupled audio routing, sensor multiplexing, and low-frequency analog bus sharing, provided signal swing remains within supply rails.
Is the SN74CBT3126PW pin-compatible with other packages in the same family?
No - while the SN74CBT3126PW shares identical logic functionality and pin numbering with D, DB, and DGV packages, its TSSOP-14 (PW) footprint differs mechanically from SOIC (D), SSOP (DB), and TVSOP (DGV). Board layout must match PW-specific dimensions: 4.4 mm × 5.0 mm body, 0.65 mm pitch, and gull-wing lead form.
What is the recommended decoupling capacitance for the VCC pin of the SN74CBT3126PW?
A minimum 100 nF ceramic capacitor placed as close as possible to the VCC (Pin 8) and GND (Pin 7) pins is recommended for the SN74CBT3126PW. For systems with high switching activity across multiple channels, adding a 1 µF bulk capacitor nearby further stabilizes supply voltage and suppresses high-frequency noise coupling into sensitive logic paths.
SN74CBT3126PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74CBT3126PW FAQ
1.How can I place an order for SN74CBT3126PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3126PW 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 SN74CBT3126PW reliable?
The price and inventory of SN74CBT3126PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3126PW is usually 5 days.
3.What payment methods are accepted for SN74CBT3126PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3126PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3126PW?
SN74CBT3126PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3126PW 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 SN74CBT3126PW?
For technical support, including SN74CBT3126PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3126PW requirements.
6.How does Aetrix verify that SN74CBT3126PW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3126PW 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 SN74CBT3126PW meets industry standards.
7.What is the process for return or replacement of SN74CBT3126PW?
All SN74CBT3126PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3126PW, 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 SN74CBT3126PW part is unused and in its original packaging.
Return procedure for SN74CBT3126PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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