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Texas Instruments SN74CBTD3306PWR
- Part No.:
- SN74CBTD3306PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTD3306PWR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,949
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Product details
Overview
SN74CBTD3306PWR from Texas Instruments is a dual FET bus switch with integrated level-shifting capability, designed for bidirectional signal routing between 5-V and 3.3-V logic domains. It features 5-Ω on-state resistance, TTL-compatible control inputs, and internal VCC-clamp diodes enabling reliable 5-V-to-3.3-V translation. Used in mixed-voltage memory/data bus interfaces where low propagation delay (0.25 ns) and fast enable/disable timing are critical.
For engineers reviewing the SN74CBTD3306PWR datasheet, SN74CBTD3306PWR pinout, SN74CBTD3306PWR application, or SN74CBTD3306PWR equivalent, key selection criteria include verified 5-Ω ron, guaranteed −40°C to 85°C operation, TSSOP-8 package thermal performance (θJA = 149°C/W), and explicit support for level-shifting without external components.
Technical Context
This device implements two independent NMOS transmission-gate switches, each controlled by a dedicated OE input operating under positive logic (low-enable). The integrated diode-to-VCC structure allows forward-biased clamping of 5-V inputs while maintaining 3.3-V output compliance-enabling true unidirectional level translation without pull-up resistors or external biasing.
Switching behavior is characterized by sub-nanosecond propagation delay (tpd ≤ 0.25 ns), fast enable (ten ≤ 5.4 ns) and disable (tdis ≤ 4.7 ns) times, and low off-state capacitance (Cio(OFF) = 4 pF), making it suitable for high-speed data paths in legacy 5-V systems interfacing with modern 3.3-V peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V supply rails and tolerance against ripple/noise |
| ron (Typ) | 5 Ω - enables minimal voltage drop (<150 mV at 30 mA) and preserves signal integrity across switched data lines |
| tpd (Max) | 0.25 ns - supports >1 GHz data rates in point-to-point or stubbed bus configurations |
| Cio(OFF) | 4 pF - limits capacitive loading on disabled channels, reducing crosstalk and signal degradation |
| VIH/VIL | 2.0 V / 0.8 V - guarantees robust TTL-level recognition even with marginal noise margins or slow edges |
| θJA | 149°C/W - defines thermal derating limit in standard PCB layouts using TSSOP-8 footprint |
Pinout & Package
TSSOP-8 package (PW), 3.1 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present. RoHS-compliant, moisture sensitivity level (MSL) not specified in available documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Channel 1 Output Enable | Active-low control: drives channel 1A↔1B connection when low; high-Z state when high |
| 2 (1A) | Channel 1 Input/Output A | Bidirectional terminal for first switched path; connects to 5-V domain side |
| 3 (1B) | Channel 1 Input/Output B | Bidirectional terminal for first switched path; connects to 3.3-V domain side |
| 4 (GND) | Ground Reference | Common return for all internal circuitry and substrate bias; must be low-impedance |
| 5 (2B) | Channel 2 Input/Output B | Bidirectional terminal for second switched path; connects to 3.3-V domain side |
| 6 (2A) | Channel 2 Input/Output A | Bidirectional terminal for second switched path; connects to 5-V domain side |
| 7 (2OE) | Channel 2 Output Enable | Active-low control: drives channel 2A↔2B connection when low; high-Z state when high |
| 8 (VCC) | Positive Supply | 5-V power rail; supplies internal clamp diodes and switch bias; decoupling required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent bus switches | Enables simultaneous isolation or connection of two separate 5-V ↔ 3.3-V signal pairs without interference |
| Integrated level-shifting diodes | Eliminates need for external clamping diodes or resistor networks in 5-V-to-3.3-V translation paths |
| Low on-state resistance (5 Ω typ) | Maintains signal rise/fall times and reduces insertion loss in high-speed digital buses |
| TTL-compatible control inputs | Directly interfaces with legacy 5-V microcontrollers, FPGAs, or ASICs without level translators on OE lines |
| Sub-nanosecond propagation delay | Preserves timing margins in DDR, PCI, or parallel flash memory interfaces operating above 100 MHz |
Applications
| PCI Bus Interface | Legacy Microcontroller I/O Expansion |
|---|---|
Use Scenario: Interfacing a 5-V PCI slot controller with 3.3-V peripheral cards requiring strict voltage domain separation. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch managing AD[31:0], C/BE#[3:0], and PAR signals during active transactions. Use Value: Enables direct 5-V-to-3.3-V signal coupling with <0.25 ns added delay and no external components-reducing BOM count and layout area. | Use Scenario: Expanding GPIO count of an older 5-V MCU to drive 3.3-V sensors or displays via parallel interface. IC Role / Device Role / Timing Role: Isolating and translating address/data/control lines between MCU port pins and external 3.3-V peripheral ICs. Use Value: Provides deterministic 5-Ω conduction path and TTL-level OE control-ensuring glitch-free handshaking and eliminating level translator ICs. |
| Flash Memory Address Latching | Industrial PLC Backplane Interfacing |
Use Scenario: Connecting 5-V address latches to 3.3-V NOR flash memory in embedded boot loaders. IC Role / Device Role / Timing Role: Enabling/disabling address bus segments during read/write cycles while maintaining voltage translation integrity. Use Value: Delivers 4 pF off-capacitance and 0.25 ns tpd-minimizing address skew and setup/hold violations at 40-MHz access rates. | Use Scenario: Bridging 5-V fieldbus controller modules with 3.3-V I/O conditioning boards in modular PLC racks. IC Role / Device Role / Timing Role: Providing hot-swap-safe, isolated signal routing between mixed-voltage backplane slots. Use Value: Supports −40°C to 85°C industrial temperature range and withstands 128 mA continuous channel current-meeting long-term reliability requirements. |
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 |
|---|---|---|---|
| SN74CBT3306PWR | No integrated level-shifting diodes; requires external biasing for 5-V-to-3.3-V translation | Suitable only when external clamping or resistor networks are acceptable | Select SN74CBT3306PWR if board space allows discrete diodes and cost optimization outweighs integration benefit |
| SN74AVC4T245RTER | Direction-controlled (not bidirectional per channel); includes auto-direction sensing and 3.3-V/2.5-V/1.8-V support | Designed for multi-voltage translation with direction management, not pure passive switching | Choose SN74AVC4T245RTER when bidirectional automatic direction detection and wider voltage flexibility are required |
Compared with SN74CBTD3306PWR, SN74CBT3306PWR lacks on-die level-shifting diodes-increasing component count and layout complexity-while SN74AVC4T245RTER adds direction control logic and broader voltage support but sacrifices true passive bidirectionality and sub-ns delay performance.
Availability
SN74CBTD3306PWR is available at Aetrix Electronics and suitable for PCI bus interfacing, legacy microcontroller I/O expansion, flash memory address latching, and industrial PLC backplane interfacing requiring stable component supply and verified mixed-voltage signal routing.
Supply support for SN74CBTD3306PWR 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, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The SN74CBTD3306PWR belongs to TI's 74CBT family of CMOS bus switches, engineered specifically for low-distortion, high-speed signal routing in mixed-voltage digital systems with emphasis on level translation and minimal propagation delay.
FAQ
What is the maximum continuous current rating for each channel of the SN74CBTD3306PWR?
The SN74CBTD3306PWR supports up to 128 mA continuous channel current per switch, as specified in its absolute maximum ratings. This rating applies under steady-state conditions with proper PCB thermal design and within the recommended VCC range of 4.5 V to 5.5 V. Exceeding this current may cause thermal overstress or parametric shift in ron and switching characteristics. The SN74CBTD3306PWR datasheet confirms this value under "Absolute Maximum Ratings" with no derating required at TA = 25°C.
Does the SN74CBTD3306PWR require external pull-up resistors on its A or B ports for level-shifting operation?
No, the SN74CBTD3306PWR does not require external pull-up resistors on its A or B ports for level-shifting operation. Its internal diode-to-VCC structure provides inherent clamping that enables direct 5-V-to-3.3-V translation without external biasing components. This functionality is explicitly documented in the device description and functional diagram of the SN74CBTD3306PWR datasheet, distinguishing it from non-level-shifting variants like SN74CBT3306PWR.
Can the SN74CBTD3306PWR operate reliably at 3.3-V VCC?
No, the SN74CBTD3306PWR is not rated for 3.3-V VCC operation. Its recommended operating VCC range is strictly 4.5 V to 5.5 V, and the internal level-shifting diodes depend on this 5-V rail to function correctly. Operating the SN74CBTD3306PWR below 4.5 V violates the recommended conditions and risks failure to clamp or translate properly. The datasheet specifies VIH = 2.0 V and VIL = 0.8 V for TTL compatibility, but VCC itself must remain at 5 V ±10%.
How does the SN74CBTD3306PWR handle floating control inputs (OE pins)?
All unused OE inputs on the SN74CBTD3306PWR must be held at either VCC or GND to ensure predictable channel states and prevent undefined switching behavior. Leaving OE pins floating can result in partial turn-on, increased ICC, or oscillation due to CMOS input sensitivity. TI's application report SCBA004 ("Implications of Slow or Floating CMOS Inputs") explicitly mandates this practice for the SN74CBTD3306PWR and is cited in the "Recommended Operating Conditions" section of its datasheet.
Is the SN74CBTD3306PWR pin-compatible with SN74CBT3306PWR?
Yes, the SN74CBTD3306PWR is pin-compatible with SN74CBT3306PWR in the same TSSOP-8 (PW) package, sharing identical pinout, footprint, and terminal assignments. However, they differ functionally: SN74CBTD3306PWR integrates level-shifting diodes, while SN74CBT3306PWR does not. This means SN74CBTD3306PWR can replace SN74CBT3306PWR in existing layouts only if the diode functionality is desired and VCC remains at 5 V; no PCB changes are needed, but system-level validation of level-shifting behavior is required.
SN74CBTD3306PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- 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
SN74CBTD3306PWR FAQ
1.How can I place an order for SN74CBTD3306PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD3306PWR 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 SN74CBTD3306PWR reliable?
The price and inventory of SN74CBTD3306PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD3306PWR is usually 5 days.
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SN74CBTD3306PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTD3306PWR 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 SN74CBTD3306PWR?
For technical support, including SN74CBTD3306PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD3306PWR requirements.
6.How does Aetrix verify that SN74CBTD3306PWR is sourced from the original manufacturer or authorized distributors?
All SN74CBTD3306PWR 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 SN74CBTD3306PWR meets industry standards.
7.What is the process for return or replacement of SN74CBTD3306PWR?
All SN74CBTD3306PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD3306PWR, 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 SN74CBTD3306PWR part is unused and in its original packaging.
Return procedure for SN74CBTD3306PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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