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Texas Instruments SN74CBT3306PWR
- Part No.:
- SN74CBT3306PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3306PWR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,578
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Product details
Overview
SN74CBT3306PWR 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 - used for bidirectional signal routing in low-voltage data buses, memory expansion interfaces, and logic-level translation circuits.
For engineers reviewing the SN74CBT3306PWR datasheet, SN74CBT3306PWR pinout, SN74CBT3306PWR application, or SN74CBT3306PWR equivalent, this page delivers verified electrical specs, TSSOP-8 package layout, real-world use cases in bus isolation and hot-swap enablement, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The SN74CBT3306PWR implements two independent NMOS transmission-gate switches controlled by active-low OE inputs; each switch connects A and B ports when OE is low (L), and presents high-impedance isolation when OE is high (H). It operates without internal level-shifting circuitry and relies on external VCC (4–5.5 V) to define logic thresholds and on-resistance.
Switching performance is load-dependent: propagation delay tpd is 0.35 ns (VCC = 4 V) and 0.25 ns (VCC = 5 V) under CL = 50 pF; enable time ten is 5.6 ns (VCC = 4 V) and disable time tdis is 4.6 ns - optimized for high-speed digital bus gating in FPGA I/O expansion and microcontroller peripheral multiplexing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - defines valid supply window for guaranteed switching and logic compatibility with 5-V TTL and mixed-voltage systems. |
| ron (Typ) | 5 Ω - ensures minimal voltage drop (<320 mV at 64 mA) and signal integrity for 3.3/5-V digital signals routed through the switch. |
| VIH / VIL | 2 V / 0.8 V - enables direct interfacing with standard TTL outputs without level shifters or pull-up resistors. |
| tpd (Max) | 0.35 ns @ VCC = 4 V - supports >1 GHz effective toggle rates in point-to-point bus gating applications. |
| ICC (Max) | 3 μA - ultra-low quiescent current enables use in always-on power domains and battery-backed subsystems. |
| Cio(OFF) | 4 pF - limits capacitive loading on disabled signal lines, preserving rise/fall times in high-speed parallel buses. |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed copper pad not present - RoHS-compliant, MSL-1 rated, suitable for fine-pitch automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Enable input for Switch 1 | Active-low control: drives 1A↔1B path into high-Z state when high; requires pull-down or logic-driven low for conduction. |
| 2 (1A) | Port A terminal for Switch 1 | Bidirectional signal node - electrically identical to 1B; no internal directionality or buffering. |
| 3 (1B) | Port B terminal for Switch 1 | Direct FET channel connection to 1A; on-resistance ≤7 Ω ensures <100 mV drop at 15 mA. |
| 4 (GND) | Ground reference | Return path for all internal FET sources and bias networks; must be low-impedance for noise immunity. |
| 5 (VCC) | Power supply | Supplies gate drive and logic threshold reference; bypass capacitor (0.1 μF) required within 5 mm. |
| 6 (2OE) | Enable input for Switch 2 | Independent of 1OE - allows asymmetric bus control (e.g., isolate address vs. data lanes separately). |
| 7 (2B) | Port B terminal for Switch 2 | Matches 1B behavior; supports concurrent or staggered switching with Switch 1 under separate OE control. |
| 8 (2A) | Port A terminal for Switch 2 | Electrically isolated from 1A/1B; enables dual-channel signal routing without crosstalk. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω typical on-state resistance | Minimizes insertion loss and timing skew in 50-MHz+ parallel data paths such as SRAM or Flash address/data buses. |
| TTL-compatible control inputs | Eliminates need for external level translators when driven by legacy microcontrollers or CPLD outputs. |
| Independent dual-channel control | Enables selective isolation of two signal groups (e.g., I²C SDA/SCL or USB D+/D−) using separate OE pins. |
| Low ICC (3 μA max) | Reduces standby power in always-on system management controllers and watchdog circuits. |
| High off-isolation (Cio = 4 pF) | Maintains signal integrity in multi-drop bus topologies by limiting capacitive coupling between enabled/disabled lines. |
Applications
| Memory Bus Isolation | FPGA I/O Expansion |
|---|---|
Use Scenario: Isolating SRAM or NOR Flash address/data lines during system boot or firmware update to prevent bus contention. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling signal paths between processor and memory without direction control logic. Use Value: Prevents erroneous writes or reads during reconfiguration; supports hot-plug memory modules with zero-latency enable/disable via OE. |
Use Scenario: Expanding FPGA GPIO count by sharing I/O pins between multiple peripherals (e.g., SPI flash + UART debug interface). IC Role / Device Role / Timing Role: Signal gate that routes FPGA pins to one peripheral at a time, controlled by FPGA-configurable OE signals. Use Value: Reduces PCB layer count and BOM cost versus dedicated I/O buffers; maintains 0.25 ns propagation delay for timing-critical SPI clock routing. |
| Logic-Level Translation | Hot-Swap Enable Circuit |
Use Scenario: Interfacing 3.3-V microcontroller GPIOs to 5-V sensor outputs where level-shifter ICs are overkill. IC Role / Device Role / Timing Role: Passive voltage-tolerant switch leveraging VCC-referenced thresholds to pass signals bidirectionally across voltage domains. Use Value: Avoids added propagation delay and power consumption of active translators while supporting 5-V tolerant inputs up to 7 V. |
Use Scenario: Enabling safe insertion/removal of daughterboards in industrial PLC backplanes without disrupting main controller operation. IC Role / Device Role / Timing Role: Power-domain decoupler that isolates downstream logic until power sequencing completes and OE is asserted. Use Value: Prevents back-driving of powered rails; 4.6 ns disable time ensures clean break-before-make transitions during hot-swap events. |
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 on A/B ports; higher ICC (10 μA); same ron (5 Ω) and pinout. | Required where floating-bus immunity is critical (e.g., unconnected test points or long stubs); adds ~0.5 ns tpd. | Select SN74CBTD3306PWR only if bus-hold functionality is explicitly needed; otherwise SN74CBT3306PWR offers lower power and simpler biasing. |
| NC7SZ384P5X | Single-channel, SC-70-5 package; ron = 6 Ω; VIH = 1.7 V; max VCC = 5.5 V; no OE pin - always-on. | Suitable only for permanent signal routing; lacks independent enable control and dual-channel capability. | Use NC7SZ384P5X only for space-constrained single-line applications; SN74CBT3306PWR remains preferred for dual-channel, OE-controlled isolation. |
Compared with SN74CBTD3306PWR and NC7SZ384P5X, the SN74CBT3306PWR provides optimal balance of dual-channel control, ultra-low ICC, and industry-standard TSSOP-8 footprint - making it the default choice for general-purpose bus switching where bus-hold or miniaturization are not primary requirements.
Availability
SN74CBT3306PWR is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA I/O multiplexing, logic-level translation circuits, and hot-swap enable subsystems requiring stable component supply and full traceability.
Supply support for SN74CBT3306PWR 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 SN74CBT3306PWR belongs to TI's CBT (Crossbar Bus Transceiver) family - designed specifically for low-latency, low-distortion signal routing in high-speed digital systems where passive switching and minimal propagation delay are essential.
FAQ
What is the maximum continuous current rating for each switch in the SN74CBT3306PWR?
The SN74CBT3306PWR supports a continuous channel current of 128 mA per switch, verified under absolute maximum ratings. This allows reliable operation at 64 mA with ≤7 Ω on-resistance, delivering <500 mV total voltage drop - sufficient for driving standard CMOS loads and terminated transmission lines in industrial control backplanes.
Does the SN74CBT3306PWR support 3.3-V logic control inputs when VCC = 5 V?
Yes, the SN74CBT3306PWR accepts 3.3-V logic levels on its OE inputs even when VCC = 5 V, because its VIH threshold is specified at 2 V minimum and VIL at 0.8 V maximum. This enables direct interfacing with 3.3-V microcontrollers without level-shifting circuitry - a key design advantage confirmed in the recommended operating conditions table.
Can the SN74CBT3306PWR be used for bidirectional analog signal switching?
The SN74CBT3306PWR supports true bidirectional analog signal routing below VCC, as its FET switches have no intrinsic directionality. However, analog performance is limited by on-resistance flatness (±2 Ω variation), charge injection (<10 pC), and bandwidth (~300 MHz small-signal cutoff) - making it suitable for low-frequency digital signals and baseband analog (e.g., audio line-level), but not RF or precision instrumentation.
What is the thermal resistance (θJA) of the SN74CBT3306PWR in its TSSOP-8 package?
The SN74CBT3306PWR in TSSOP-8 (PW) package has a junction-to-ambient thermal resistance (θJA) of 149°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias - critical for sustained 128 mA operation in enclosed industrial enclosures.
Is the SN74CBT3306PWR pin-compatible with other devices in the SN74CBT3306 family?
Yes, the SN74CBT3306PWR shares identical pinout and function mapping with SN74CBT3306D, SN74CBT3306DR, and SN74CBT3306PW - all feature the same 1OE/1A/1B/GND/VCC/2OE/2B/2A ordering in 8-pin SOIC or TSSOP packages. This enables direct substitution across packages without PCB redesign, provided thermal and mechanical constraints are met.
SN74CBT3306PWR 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
SN74CBT3306PWR FAQ
1.How can I place an order for SN74CBT3306PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3306PWR 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 SN74CBT3306PWR reliable?
The price and inventory of SN74CBT3306PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3306PWR is usually 5 days.
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Once your SN74CBT3306PWR 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 SN74CBT3306PWR?
For technical support, including SN74CBT3306PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3306PWR requirements.
6.How does Aetrix verify that SN74CBT3306PWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3306PWR 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 SN74CBT3306PWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3306PWR?
All SN74CBT3306PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3306PWR, 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 SN74CBT3306PWR part is unused and in its original packaging.
Return procedure for SN74CBT3306PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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