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Texas Instruments SN74CBT3306PWRG4
- Part No.:
- SN74CBT3306PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3306PWRG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
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Product details
Overview
SN74CBT3306PWRG4 from Texas Instruments is a dual FET bus switch IC with independent 5-Ω on-state resistance switches, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and operation across −40°C to 85°C. It enables bidirectional signal routing between two ports (A↔B) per channel under OE control, used in low-latency data path isolation for digital logic interfaces.
For engineers reviewing the SN74CBT3306PWRG4 datasheet, SN74CBT3306PWRG4 pinout, SN74CBT3306PWRG4 application, or SN74CBT3306PWRG4 equivalent, key selection criteria include on-resistance matching, 50-pF load switching speed (tpd = 0.25 ns at 5 V), thermal performance in TSSOP-8 (θJA = 149°C/W), and compatibility with 4–5.5 V supply systems requiring rail-to-rail analog/digital signal pass-through.
Technical Context
This device implements two independent NMOS transmission gate switches, each controlled by a dedicated OE input. When OE is low, the A and B ports are connected via a low-RON FET path; when OE is high, the channel is fully disconnected with Cio(OFF) = 4 pF.
It operates without level-shifting-supports bidirectional signal flow across VCC-referenced logic domains-and features ±1 μA input leakage, 3 μA quiescent ICC, and robust absolute ratings (−0.5 V to 7 V on all pins), making it suitable for hot-swap-capable backplane and I/O expansion designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures stable operation in standard 5-V digital systems with margin for supply variation. |
| RON (Typical) | 5 Ω - Enables minimal voltage drop (<320 mV at 64 mA) and preserves signal integrity in high-speed data paths. |
| tpd (Max) | 0.35 ns at 4 V - Supports sub-nanosecond propagation for timing-critical address/data bus switching. |
| Cio(OFF) | 4 pF - Limits capacitive loading during disable state, reducing crosstalk in dense PCB layouts. |
| θJA | 149°C/W - Defines thermal derating in TSSOP-8 package; requires ≤128 mA continuous current to stay within safe junction limits. |
| IIK | −50 mA clamp current - Protects against negative transients without external diodes in mixed-voltage interconnects. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, JEDEC MO-153 compliant. RoHS-compliant, lead-finish unspecified per TI documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Channel 1 output-enable control input | Active-low enable: drives internal NMOS gate to connect/disconnect 1A–1B path. |
| 2 (1A) | Channel 1 port A terminal | Bidirectional signal node; electrically identical to 1B when enabled; no polarity constraint. |
| 3 (1B) | Channel 1 port B terminal | Matches 1A in voltage range and current capability; supports rail-to-rail analog/digital signals up to VCC. |
| 4 (GND) | Power ground reference | Return path for switch conduction current and control logic; must be low-impedance for noise immunity. |
| 5 (VCC) | Positive supply rail | Powers internal bias circuitry and defines logic threshold; bypass capacitor required near pin. |
| 6 (2OE) | Channel 2 output-enable control input | Independent of 1OE; allows asynchronous enable/disable of second switch pair. |
| 7 (2B) | Channel 2 port B terminal | Electrically isolated from 1B; shares same VCC/GND but no internal coupling. |
| 8 (2A) | Channel 2 port A terminal | Functionally identical to 2B; supports separate data lanes (e.g., dual-bit bus isolation). |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω typical on-state resistance | Minimizes insertion loss and duty-cycle distortion in clock or data lines operating up to 100 MHz. |
| TTL-compatible control inputs | Accepts standard 5-V logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) without pull-ups or level shifters. |
| 4 pF off-state capacitance | Reduces crosstalk and maintains signal integrity in high-density routing environments like FPGA I/O banks. |
| −40°C to 85°C operating range | Validated for industrial temperature applications including programmable logic controllers and test equipment. |
| Independent dual-channel control | Enables selective isolation of two signal pairs (e.g., address + data) without shared enable timing constraints. |
Applications
| PCI Bus Isolation | FPGA I/O Expansion |
|---|---|
Use Scenario: Isolating legacy PCI add-in cards from motherboard logic during hot-plug events or power sequencing. IC Role / Device Role / Timing Role: Dual-channel bidirectional bus switch providing galvanic separation while preserving signal rise/fall times. Use Value: Prevents back-driving and latch-up during card insertion/removal using independent OE control per lane. |
Use Scenario: Expanding FPGA GPIO count by routing unused I/O through configurable switch paths to peripheral interfaces. IC Role / Device Role / Timing Role: Low-latency signal path selector enabling dynamic reconfiguration of I²C, SPI, or parallel buses. Use Value: Achieves <0.35 ns propagation delay and 5 Ω RON to maintain timing margins in multi-FPGA synchronization schemes. |
| Memory Address Multiplexing | Digital Test Equipment Signal Routing |
Use Scenario: Sharing a single address bus between multiple memory devices (e.g., SRAM and Flash) in microcontroller-based systems. IC Role / Device Role / Timing Role: Bidirectional bus switch acting as an address-path gate controlled by chip-select logic. Use Value: Eliminates need for tristate buffers or complex glue logic while supporting 5-V tolerant signaling across memory families. |
Use Scenario: Automated test fixture routing of stimulus signals to DUT pins under software control in ATE platforms. IC Role / Device Role / Timing Role: Precision signal path selector with low Cio(OFF) and matched RON for calibrated signal injection. Use Value: Delivers 4 pF off-capacitance and ±1 μA leakage to ensure measurement accuracy and minimize settling time errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3306PWR | Includes bus-hold circuitry and higher drive strength; RON = 4 Ω typical; VCC = 4.5–5.5 V only. | Preferred where input floating states must be prevented without external resistors (e.g., unconnected test points). | Select when bus-hold functionality is required and tighter RON tolerance justifies narrower VCC range. |
| 74LVC2G66DP,125 | Single-channel, 3.3-V only (1.65–5.5 V), RON = 8 Ω typical, tpd = 0.7 ns; smaller XSON-8 package. | Suitable for space-constrained 3.3-V systems where dual-channel integration is not mandatory. | Choose for compact 3.3-V designs needing lower footprint; not drop-in due to single-channel and different pinout. |
Compared with SN74CBT3306PWRG4, SN74CBTD3306PWR adds bus-hold but narrows supply range, while 74LVC2G66DP,125 offers smaller size and wider voltage support at the cost of doubled board area for dual-channel use and higher RON.
Availability
SN74CBT3306PWRG4 is available at Aetrix Electronics and suitable for industrial control systems, FPGA I/O expansion modules, and digital test equipment requiring stable component supply with verified TSSOP-8 packaging and −40°C to 85°C operation.
Supply support for SN74CBT3306PWRG4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The SN74CBT3306PWRG4 belongs to TI's CBT (Crosspoint Bus Transceiver) family, designed specifically for low-RON, high-speed digital bus switching in 5-V logic systems with minimal propagation delay and precise signal fidelity.
FAQ
What is the maximum continuous current rating for each switch channel in the SN74CBT3306PWRG4?
The SN74CBT3306PWRG4 supports a continuous channel current of 128 mA per switch, as specified in its absolute maximum ratings. This value reflects the maximum DC current the internal FET can conduct without exceeding thermal limits under defined PCB layout and ambient conditions. Exceeding this current risks junction overheating and long-term reliability degradation. The SN74CBT3306PWRG4 must be used within this limit even if voltage drop remains acceptable.
Does the SN74CBT3306PWRG4 support bidirectional signal flow between its A and B ports?
Yes, the SN74CBT3306PWRG4 supports true bidirectional signal flow-signals pass equally well from A to B or B to A when the corresponding OE input is low. Its NMOS transmission gate architecture imposes no directionality, and both terminals tolerate voltages from GND to VCC. This makes the SN74CBT3306PWRG4 ideal for data, address, and clock lines where signal direction changes dynamically.
Can the SN74CBT3306PWRG4 operate with a 3.3-V supply voltage?
No, the SN74CBT3306PWRG4 is not rated for reliable operation at 3.3 V. Its recommended operating VCC range is 4 V to 5.5 V, and VIH/VIL thresholds (2 V/0.8 V) assume full 5-V logic compatibility. At 3.3 V, the control inputs may fail to register valid logic levels, and RON increases significantly-degrading signal integrity. Use SN74LVC2G66 or similar 3.3-V-optimized switches instead of SN74CBT3306PWRG4.
What is the thermal resistance (θJA) of the SN74CBT3306PWRG4 in its TSSOP-8 package?
The SN74CBT3306PWRG4 has a junction-to-ambient thermal resistance (θJA) of 149°C/W in the TSSOP-8 (PW) package, per TI's datasheet. This value assumes standard JEDEC test conditions (single-layer copper, no airflow). Real-world PCB layout-including copper area, layer count, and thermal vias-will affect actual thermal performance. For sustained 128 mA operation, the SN74CBT3306PWRG4 requires careful thermal design to avoid exceeding 125°C junction temperature.
Is the SN74CBT3306PWRG4 pin-compatible with other members of the SN74CBT3306 family?
Yes, the SN74CBT3306PWRG4 shares identical pinout and electrical behavior with SN74CBT3306PWR, SN74CBT3306PW, and SN74CBT3306DR-despite differing packaging (TSSOP vs SOIC) and marking variants. All share the same D or PW package footprint, identical function table, and matching pin assignments (1OE, 1A, 1B, GND, VCC, 2OE, 2B, 2A). Thus, SN74CBT3306PWRG4 can replace SN74CBT3306PWR in existing TSSOP-8 layouts without modification.
SN74CBT3306PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 2
- 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:
- 8-TSSOP
SN74CBT3306PWRG4 FAQ
1.How can I place an order for SN74CBT3306PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3306PWRG4 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 SN74CBT3306PWRG4 reliable?
The price and inventory of SN74CBT3306PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3306PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74CBT3306PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3306PWRG4 transactions.
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4.How is shipping managed for SN74CBT3306PWRG4?
SN74CBT3306PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3306PWRG4 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 SN74CBT3306PWRG4?
For technical support, including SN74CBT3306PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3306PWRG4 requirements.
6.How does Aetrix verify that SN74CBT3306PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3306PWRG4 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 SN74CBT3306PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3306PWRG4?
All SN74CBT3306PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3306PWRG4, 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 SN74CBT3306PWRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3306PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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