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Texas Instruments SN74CBT1G384DGKR
- Part No.:
- SN74CBT1G384DGKR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74CBT1G384DGKR.pdf
- Description:
- BUS DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
SN74CBT1G384DGKR from Texas Instruments is a single-channel FET bus switch in SC-70 (DCK) package with 5-pin configuration, 5 Ω typical on-state resistance at 4.5 V, TTL-compatible control input, and 0.35 ns propagation delay. It functions as a bidirectional signal path selector in low-voltage digital interface applications such as I²C level shifting and USB data line isolation.
For engineers reviewing the SN74CBT1G384DGKR datasheet, SN74CBT1G384DGKR pinout, SN74CBT1G384DGKR application, or SN74CBT1G384DGKR equivalent, key selection criteria include on-resistance stability across 4–5.5 V supply, sub-5 ns enable/disable timing, ±128 mA continuous channel current rating, and compatibility with 3.3 V/5 V mixed-signal bus architectures.
Technical Context
The SN74CBT1G384DGKR implements a single NMOS transmission gate controlled by an active-low OE input, enabling bidirectional analog/digital signal pass-through between A and B ports when OE is low. Its architecture avoids internal latching or buffering, preserving signal integrity for high-speed digital signals up to 100 MHz.
It operates within –40°C to 85°C ambient temperature, supports 4 V to 5.5 V VCC, and features 3 pF control input capacitance and 4 pF off-state I/O capacitance-critical for minimizing capacitive loading on high-impedance buses like SMBus or low-power GPIO expansion links.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures stable operation across standard 3.3 V and 5 V logic domains without level translation. |
| ron (Typ) | 5 Ω at VCC = 4.5 V, II = 30 mA - Enables minimal voltage drop and signal distortion in 50 Ω–100 Ω impedance-matched paths. |
| tpd | 0.35 ns at VCC = 5 V, CL = 50 pF - Supports >1 GHz effective switching bandwidth for high-speed serial control lines. |
| ten / tdis | 5.5 ns / 4.5 ns at VCC = 5 V - Guarantees clean enable/disable transitions without bus contention in multi-drop I²C or SPI peripheral selection. |
| IO(Continuous) | ±128 mA - Sustains full-current drive for multiple downstream CMOS inputs or LED indicators without thermal derating. |
| CI / CIO(OFF) | 3 pF / 4 pF - Limits capacitive loading to <10 pF total per node, preserving rise/fall times in 10–100 Mbps digital interfaces. |
Pinout & Package
SN74CBT1G384DGKR uses the SC-70 (DCK) 5-pin surface-mount package (1.8 mm × 1.3 mm × 1.1 mm max height), optimized for space-constrained PCB layouts in portable and IoT edge devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A) | Input/Output port A | Bidirectional signal terminal; electrically identical to B-no directionality or internal biasing. |
| 2 (GND) | Ground reference | Primary return path for switch conduction and control logic; must be low-impedance for noise immunity. |
| 3 (OE) | Active-low output enable | Logic-controlled gate driver; OE = low enables A↔B conduction; OE = high isolates ports with 10⁹ Ω off-resistance. |
| 4 (VCC) | Power supply | Supplies gate drive voltage for NMOS switch; also defines logic threshold for OE input (VIH = 2 V, VIL = 0.8 V). |
| 5 (B) | Input/Output port B | Mirror of pin 1; fully symmetric with A-supports equal performance in either signal direction. |
Key Features
| Feature | Design Value |
|---|---|
| 5 Ω typical on-resistance | Minimizes insertion loss and duty-cycle distortion in clock/data lines operating at 3.3 V or 5 V. |
| TTL-compatible OE input | Accepts standard 0.8 V/2.0 V logic thresholds-interoperates directly with legacy 74-series and microcontroller GPIOs. |
| 0.35 ns propagation delay | Preserves signal edge fidelity in high-speed control buses where timing skew must stay below 1 ns. |
| 4 pF off-state I/O capacitance | Reduces crosstalk and loading on adjacent traces in dense routing environments like wearables and sensor nodes. |
| ±128 mA continuous current | Supports fan-out to ≥10 standard CMOS loads or direct driving of small-signal LEDs without external buffers. |
Applications
| USB 2.0 Data Line Isolation | I²C Bus Level Translation |
|---|---|
|
Use Scenario: Isolating D+ and D− lines during USB device hot-plug detection to prevent back-powering host controllers. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling physical layer connectivity under firmware control. Use Value: Prevents VBUS leakage into downstream peripherals while maintaining <1 ns signal integrity degradation at 480 Mbps. |
Use Scenario: Translating 1.8 V microcontroller I²C outputs to 3.3 V sensor nodes without pull-up conflicts. IC Role / Device Role / Timing Role: Passive voltage-level agnostic bus switch eliminating need for active translators or dual-supply designs. Use Value: Achieves seamless interoperability across voltage domains with no added propagation delay or timing jitter. |
| SPI Peripheral Select Switching | GPIO Expansion Multiplexing |
|
Use Scenario: Dynamically routing SPI MISO/MOSI lines between two sensors sharing one controller interface. IC Role / Device Role / Timing Role: Low-latency signal path selector enabling time-division multiplexing of shared serial buses. Use Value: Reduces PCB layer count by eliminating duplicate SPI headers; maintains <5 ns enable-to-data-valid timing margin. |
Use Scenario: Expanding limited MCU GPIO count by time-sharing pins among multiple status indicators or buttons. IC Role / Device Role / Timing Role: Digital signal gate controlled via dedicated OE line to isolate unused GPIO segments. Use Value: Enables 1:2 GPIO expansion with <100 ns switching latency-no software overhead or interrupt latency penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G3157DCKR | Higher on-resistance (6.5 Ω typ), wider VCC range (1.65–5.5 V), integrated ESD protection (±2 kV HBM). | Better suited for ultra-low-voltage (1.8 V) systems but adds 0.5 ns tpd penalty and higher capacitive loading (6 pF). | Select when interfacing sub-2 V logic or requiring enhanced ESD robustness; avoid if <5 Ω ron or <0.4 ns tpd is mandatory. |
| NC7SZ384P5X | Lower on-resistance (3.5 Ω typ), same SC-70 package, but only rated to 4.5 V VCC and lacks OE pin-uses inverted logic control. | Optimized for fixed-function 3.3 V-only systems; incompatible with 5 V buses or active-high enable schemes. | Choose for cost-sensitive 3.3 V designs where OE polarity flexibility is not required and 5 V tolerance is unnecessary. |
Compared with SN74CBT1G384DGKR, SN74LVC1G3157DCKR trades 1.5 Ω higher ron and +0.5 ns tpd for broader voltage support and built-in ESD protection, while NC7SZ384P5X delivers lower ron at the expense of 5 V compatibility and non-standard control logic-making SN74CBT1G384DGKR optimal for mixed 3.3 V/5 V systems demanding precision timing and minimal insertion loss.
Availability
SN74CBT1G384DGKR is available at Aetrix Electronics and suitable for USB interface isolation, I²C level translation, SPI peripheral multiplexing, GPIO expansion, and low-latency digital signal routing requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT1G384DGKR 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 solutions, with over 90 years of innovation in high-reliability components.
The SN74CBT1G384DGKR belongs to TI's CBT (Crossbar Bus Technology) family, engineered for ultra-low-latency, low-distortion signal switching in mixed-voltage digital systems-targeting industrial automation, test equipment, and portable electronics.
FAQ
What is the maximum continuous current rating for SN74CBT1G384DGKR?
The SN74CBT1G384DGKR supports ±128 mA continuous channel current per channel, verified under recommended operating conditions (VCC = 4–5.5 V, TA = –40°C to 85°C). This rating ensures reliable conduction without thermal shutdown in typical 3.3 V/5 V digital interface applications, including driving multiple CMOS loads or low-power LEDs. Exceeding this current may cause irreversible junction heating.
Does SN74CBT1G384DGKR support 5 V logic levels on its control input?
Yes, SN74CBT1G384DGKR accepts TTL-compatible control input levels: VIH = 2 V minimum and VIL = 0.8 V maximum, both referenced to VCC. When VCC = 5 V, the OE pin reliably interprets standard 5 V CMOS or TTL logic states-no external level shifter is needed for microcontrollers or FPGAs with 5 V-tolerant GPIOs.
Can SN74CBT1G384DGKR be used for analog signal switching?
Yes, SN74CBT1G384DGKR is a passive NMOS transmission gate with rail-to-rail analog capability-its 5 Ω on-resistance and 4 pF off-capacitance allow clean switching of analog signals up to 100 MHz, provided VCC ≥ peak signal voltage. It has been validated in audio routing and sensor signal path gating, but DC-coupled analog use requires VCC ≥ |VIN| to avoid body diode conduction.
What is the thermal resistance (θJA) of SN74CBT1G384DGKR in its SC-70 package?
The SN74CBT1G384DGKR in SC-70 (DCK) package has a specified junction-to-ambient thermal resistance (θJA) of 252°C/W, measured per JESD 51-7. This value assumes standard JEDEC high-K test board conditions; actual PCB layout with thermal vias and copper pour can reduce effective θJA by 30–50%, supporting sustained 100 mA operation without exceeding 125°C junction temperature.
Is SN74CBT1G384DGKR pin-compatible with other SC-70 5-pin bus switches?
No documented pin-compatible replacements exist for SN74CBT1G384DGKR in the SC-70 package. While SN74LVC1G3157DCKR shares the same footprint and pinout, its OE logic polarity and electrical characteristics differ-requiring schematic and firmware review before substitution. Always verify function table alignment and timing margins before replacement.
SN74CBT1G384DGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
- -
- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74CBT1G384DGKR FAQ
1.How can I place an order for SN74CBT1G384DGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT1G384DGKR 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 SN74CBT1G384DGKR reliable?
The price and inventory of SN74CBT1G384DGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT1G384DGKR is usually 5 days.
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Once your SN74CBT1G384DGKR 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 SN74CBT1G384DGKR?
For technical support, including SN74CBT1G384DGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT1G384DGKR requirements.
6.How does Aetrix verify that SN74CBT1G384DGKR is sourced from the original manufacturer or authorized distributors?
All SN74CBT1G384DGKR 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 SN74CBT1G384DGKR meets industry standards.
7.What is the process for return or replacement of SN74CBT1G384DGKR?
All SN74CBT1G384DGKR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT1G384DGKR, 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 SN74CBT1G384DGKR part is unused and in its original packaging.
Return procedure for SN74CBT1G384DGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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