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Texas Instruments SN74CBT3126PWRG4
- Part No.:
- SN74CBT3126PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3126PWRG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,099
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Product details
Overview
SN74CBT3126PWRG4 from Texas Instruments is a quadruple FET bus switch IC with independent 5-Ω bidirectional analog/digital signal paths, TTL-compatible control inputs, and 4.0–5.5 V supply operation. It enables or isolates four data lines in high-speed digital interfaces such as memory expansion, address/data multiplexing, and level-translating I/O buffering.
For engineers reviewing the SN74CBT3126PWRG4 datasheet, SN74CBT3126PWRG4 pinout, SN74CBT3126PWRG4 application, or SN74CBT3126PWRG4 equivalent, this device is selected for low-on-resistance switching, fast enable/disable timing (≤5.4 ns), latch-up immunity (>250 mA), and TSSOP-14 packaging compatible with space-constrained PCB layouts.
Technical Context
This device implements four independent NMOS transmission-gate switches controlled by separate OE inputs, each providing a low-impedance path (5–7 Ω typical) between A and B terminals when enabled. The architecture supports bidirectional signal flow without direction control pins and maintains high-impedance isolation when OE is low.
It operates across −40°C to +85°C with supply voltage from 4.0 V to 5.5 V, features input clamp current rating of −50 mA, and meets JESD 17 latch-up performance exceeding 250 mA. Input capacitance is 3 pF and off-state I/O capacitance is 4 pF, minimizing signal distortion in high-frequency data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (rON) | 5–7 Ω at VCC = 4.5 V, enabling low-voltage-drop signal routing for 3.3 V/5 V mixed-signal systems |
| Propagation delay (tpd) | 0.25–0.35 ns at VCC = 5 V, supporting >1 GHz data rates in high-speed bus applications |
| Enable/disable time (ten/tdis) | 1.6–5.4 ns, allowing precise timing control for dynamic bus arbitration and hot-swap isolation |
| Supply voltage range | 4.0–5.5 V, ensuring compatibility with standard 5 V logic rails and tolerant of minor rail droop |
| Input voltage range (VI) | −0.5 V to 7 V, permitting safe interfacing with overvoltage-tolerant or floating-bus conditions |
| Latch-up immunity | >250 mA per JESD 17, eliminating risk of destructive latch-up during transient fault events |
| Off-state I/O capacitance (Cio(OFF)) | 4 pF, minimizing capacitive loading on adjacent traces and preserving signal integrity in dense routing |
Pinout & Package
TSSOP-14 (PW) package: 5.0 mm × 4.4 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 enables its corresponding A↔B switch pair; tie low via pulldown resistor for power-up high-Z safety |
| 1A–4A, 1B–4B | Bidirectional signal terminals | Four independent analog/digital channels; no directionality-signal flows A→B or B→A identically when enabled |
| VCC | Positive supply | 4.0–5.5 V power rail; decoupling capacitor required near pin for noise suppression and transient current delivery |
| GND | Ground reference | Common return path for all internal FETs and control logic; must be low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple independent FET switches | Enables selective isolation of four parallel data lines without shared control or crosstalk coupling |
| 5 Ω typical on-resistance | Minimizes voltage drop and power loss in 5 V/3.3 V signal paths, critical for maintaining logic thresholds in fan-out scenarios |
| TTL-compatible input thresholds | VIL ≤ 0.8 V / VIH ≥ 2.0 V ensures reliable interfacing with legacy 5 V TTL and CMOS drivers without level shifters |
| Low input and off-state capacitance | 3 pF control input / 4 pF off-state I/O capacitance reduces loading on driving sources and preserves edge rate in high-speed buses |
| High latch-up immunity | Exceeds 250 mA per JESD 17, allowing robust operation in noisy industrial environments with ESD or surge transients |
Applications
| Memory Expansion Interface | Address/Data Bus Multiplexing |
|---|---|
|
Use Scenario: Isolating SRAM or Flash memory data lines during configuration or standby to prevent back-driving and leakage. IC Role / Device Role / Timing Role: Bidirectional signal gate placed between microcontroller data bus and external memory array. Use Value: Prevents contention during reset or sleep modes while maintaining full-speed read/write throughput when active. |
Use Scenario: Separating shared address/data bus lines between CPU and peripheral controllers in 8080-style parallel interfaces. IC Role / Device Role / Timing Role: Four-channel bus switch enabling time-multiplexed access to common bus resources. Use Value: Eliminates need for complex bus arbitration logic and reduces PCB layer count by replacing discrete buffers. |
| Hot-Swappable I/O Module | Level-Translating Signal Buffer |
|
Use Scenario: Safely connecting/removing peripheral modules (e.g., sensor cards) while main system remains powered. IC Role / Device Role / Timing Role: Isolation element placed in front of module I/O lines, controlled by hot-swap controller. Use Value: Provides galvanic isolation during insertion/removal, preventing bus glitches and protecting host controller I/O pins. |
Use Scenario: Interfacing 3.3 V FPGA I/O to 5 V legacy peripherals where voltage translation is required without direction control. IC Role / Device Role / Timing Role: Passive analog switch used with external pull-up resistors to achieve bidirectional level shifting. Use Value: Enables interoperability between mixed-voltage domains using only passive components and no active translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PWR | Octal channel, higher rON (7–10 Ω), supports 3.3 V–5 V dual-supply operation | Used where higher channel count and dual-rail support outweigh single-supply simplicity | Choose when expanding to 8-line buses or requiring independent VCC/VREF rails |
| 74LVC1G3157DBVR | Single-channel, lower rON (3–5 Ω), 1.65–5.5 V supply, smaller SOT-23-6 package | Applied in point-of-load signal gating where space is constrained and channel count is minimal | Prefer for ultra-compact designs needing only one isolated path with tighter on-resistance tolerance |
Compared with SN74CBT3126PWRG4, SN74CBTD3384PWR offers double the channel density but requires additional supply management, while 74LVC1G3157DBVR delivers superior rON in half the footprint but lacks multi-channel integration-selection depends on channel scaling, voltage flexibility, and board area trade-offs.
Availability
SN74CBT3126PWRG4 is available at Aetrix Electronics and suitable for memory expansion interfaces, address/data bus multiplexing, hot-swappable I/O modules, and level-translating signal buffering requiring stable component supply and long-term production continuity.
Supply support for SN74CBT3126PWRG4 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 SN74CBT3126PWRG4 belongs to TI's CBT (Crosspoint Bus Transceiver) family, designed specifically for low-latency, low-distortion signal routing in high-speed digital systems including computing, communications, and industrial control.
FAQ
What is the maximum continuous current per channel for SN74CBT3126PWRG4?
The SN74CBT3126PWRG4 supports a continuous channel current of 128 mA per switch. This rating applies under recommended operating conditions (VCC = 4.0–5.5 V, TA = −40°C to +85°C) and ensures safe conduction without thermal runaway or parametric shift. Exceeding this limit risks permanent degradation of the FET channel resistance and reliability.
Does SN74CBT3126PWRG4 require external pull-up or pull-down resistors on its OE inputs?
Yes - to ensure high-impedance state during power-up or power-down, each OE input of SN74CBT3126PWRG4 must be tied to GND through a pulldown resistor. The minimum value is determined by the current-sourcing capability of the driver; TI recommends values between 1 kΩ and 10 kΩ for most 5 V logic systems to guarantee fast, deterministic disable behavior.
Can SN74CBT3126PWRG4 operate with a 3.3 V supply voltage?
No - SN74CBT3126PWRG4 has a specified minimum supply voltage of 4.0 V per its recommended operating conditions. Operation below 4.0 V may result in undefined switching behavior, increased on-resistance, or failure to meet timing specifications. For 3.3 V systems, consider alternatives like SN74LVC1G3157 or SN74CB3Q3257.
Is SN74CBT3126PWRG4 pin-compatible with other packages in the same family?
Yes - SN74CBT3126PWRG4 (TSSOP-14) shares identical pinout with SN74CBT3126D (SOIC-14), SN74CBT3126DBR (SSOP-14), and SN74CBT3126DGVR (TVSOP-14). All use the standard '126-type pin assignment: OE/A/B groups arranged symmetrically with VCC at pin 8 and GND at pin 7, enabling direct PCB footprint substitution across these packages.
What is the thermal resistance (θJA) of SN74CBT3126PWRG4 in its TSSOP package?
The junction-to-ambient thermal resistance (θJA) for SN74CBT3126PWRG4 in the PW (TSSOP-14) package is 113°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2-layer test board conditions; actual board-level performance improves significantly with copper pour, thermal vias, and proper layout per TI's PCB design guidelines for PW packages.
SN74CBT3126PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
SN74CBT3126PWRG4 FAQ
1.How can I place an order for SN74CBT3126PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3126PWRG4 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 SN74CBT3126PWRG4 reliable?
The price and inventory of SN74CBT3126PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3126PWRG4 is usually 5 days.
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SN74CBT3126PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3126PWRG4 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 SN74CBT3126PWRG4?
For technical support, including SN74CBT3126PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3126PWRG4 requirements.
6.How does Aetrix verify that SN74CBT3126PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3126PWRG4 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 SN74CBT3126PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3126PWRG4?
All SN74CBT3126PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3126PWRG4, 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 SN74CBT3126PWRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3126PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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