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Texas Instruments SN74CBT1G384DCKT
- Part No.:
- SN74CBT1G384DCKT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SN74CBT1G384DCKT.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,045
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Product details
Overview
SN74CBT1G384DCKT from Texas Instruments is a single-pole, single-throw (SPST) FET bus switch in SC-70 (DCK) 5-pin package, featuring 5-Ω on-state resistance at 4 V supply, TTL-compatible OE control input, and bidirectional signal routing between A and B ports. It operates from –40°C to 85°C with 4–5.5 V supply and supports high-speed digital isolation in data path switching applications.
For engineers reviewing the SN74CBT1G384DCKT datasheet, SN74CBT1G384DCKT pinout, SN74CBT1G384DCKT application, or SN74CBT1G384DCKT equivalent, this page delivers verified electrical parameters, validated SC-70 pin mapping, real-world use cases in level-shifting and bus isolation, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The SN74CBT1G384DCKT implements a single-channel transmission gate using NMOS pass transistor architecture with no internal pull-ups or level shifters. Its OE input enables/disables conduction between A and B terminals with propagation delay under 0.35 ns at 5 V and disable time under 4.5 ns.
It requires no external biasing and supports rail-to-rail analog/digital signal pass-through up to 128 mA continuous current. The device exhibits low input capacitance (3 pF) and off-state I/O capacitance (4 pF), minimizing signal integrity degradation in high-frequency data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, 30 mA - ensures minimal voltage drop and power loss in signal path |
| Propagation delay (tpd) | 0.35 ns max at VCC = 5 V, CL = 50 pF - enables sub-nanosecond timing in high-speed interfaces |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V logic systems and tolerant of supply variation |
| Control input levels | VIL ≤ 0.8 V, VIH ≥ 2 V - fully TTL-compatible, eliminating need for level translators |
| Operating temperature | –40°C to +85°C - qualified for industrial ambient environments without derating |
| Off-state I/O capacitance | 4 pF - reduces capacitive loading and crosstalk when switch is disabled |
| Input capacitance (Ci) | 3 pF - minimizes driver load and preserves rise/fall times on OE control line |
Pinout & Package
SN74CBT1G384DCKT uses the SC-70 (DCK) 5-pin surface-mount package (1.3 mm × 2.2 mm × 1.1 mm height), optimized for space-constrained PCB layouts while maintaining thermal performance (θJA = 252°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A) | Input/Output port A | Bidirectional signal terminal - connects to source or sink side of data path |
| 2 (GND) | Ground reference | Return path for internal FET body and control logic - must be low-impedance |
| 3 (OE) | Output-enable control | Active-low logic input - high disables A–B connection, low enables conduction |
| 4 (VCC) | Power supply | Supplies internal gate drive and bias - must be decoupled near pin |
| 5 (B) | Input/Output port B | Bidirectional signal terminal - electrically identical to Pin 1, forms switched path with A |
Key Features
| Feature | Design Value |
|---|---|
| Low on-state resistance | 5 Ω typical ensures <50 mV drop at 10 mA - preserves logic high/low margins |
| TTL-compatible control | OE accepts standard 0.8 V/2.0 V thresholds - eliminates external level-shifting circuitry |
| Ultra-fast switching | 0.35 ns propagation delay enables use in >1 GHz data paths with minimal skew |
| Bidirectional operation | No inherent directionality - supports signal flow from A→B or B→A without reconfiguration |
| Low capacitive loading | 3 pF input + 4 pF off-state I/O capacitance - maintains signal integrity in high-speed traces |
Applications
| USB 2.0 Data Line Isolation | PCI Express Lane Multiplexing |
|---|---|
Use Scenario: Isolating D+ and D– lines during USB device hot-plug detection to prevent backdrive into host controller. IC Role / Device Role / Timing Role: SPST analog switch placed inline with differential pair - controlled by microcontroller GPIO to enable/disable physical layer connection. Use Value: Prevents signal contention and ESD-induced latch-up during enumeration; 5-Ω Ron avoids USB eye diagram distortion. | Use Scenario: Dynamically rerouting PCIe Gen1 lanes between two endpoints using shared physical traces. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling lane sharing without protocol-aware logic - OE synchronized to link training state. Use Value: Reduces PCB layer count and connector pins; sub-ns tpd avoids violating PCIe timing budgets. |
| Microcontroller GPIO Expansion | Legacy Parallel Bus Level Translation |
Use Scenario: Sharing limited MCU GPIOs across multiple peripherals via time-multiplexed access to parallel interface lines. IC Role / Device Role / Timing Role: Signal gating element controlled by address decoder output - isolates inactive peripherals from data bus. Use Value: Eliminates need for tri-state buffers or complex bus arbitration; 5-V tolerant I/O supports mixed-voltage peripherals. | Use Scenario: Interfacing 3.3-V FPGA I/O banks to legacy 5-V parallel EEPROM or SRAM devices. IC Role / Device Role / Timing Role: Passive level translator - leverages bidirectional conduction and rail-to-rail voltage handling without active logic. Use Value: Avoids propagation delay and power consumption of active translators; 5-Ω Ron preserves setup/hold timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD1G384DCKT | Includes bus-hold circuitry on A/B ports; higher ICC (10 µA vs. 1 µA); same SC-70 package | Required where floating-bus immunity is critical (e.g., unconnected test points); adds ~0.5 ns tpd | Select when bus-hold functionality prevents undefined states during idle periods - not drop-in due to increased quiescent current |
| 74LVC1G3157GW,125 | Dual SPDT configuration; 3.3-V only supply (1.65–5.5 V); 6.5 Ω Ron at 3.3 V; SOT-363 package | Supports signal routing between three ports (common + two throws); larger footprint than SC-70 | Choose when dual-switch topology or wider voltage range is needed - not pin-compatible; requires layout change |
Compared with SN74CBT1G384DCKT, SN74CBTD1G384DCKT adds bus-hold but increases leakage and delay, while 74LVC1G3157GW,125 offers dual switching and broader voltage support at the cost of pinout and package incompatibility - all require design validation before substitution.
Availability
SN74CBT1G384DCKT is available at Aetrix Electronics and suitable for industrial automation I/O modules, embedded USB peripheral hubs, and FPGA-based prototyping platforms requiring stable component supply and long-term manufacturability.
Supply support for SN74CBT1G384DCKT 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 over 90 years of innovation in precision analog and logic solutions.
The SN74CBT1G384DCKT belongs to TI's CBT (Crossbar Technology) family of high-speed CMOS bus switches, engineered for low-latency, low-distortion signal routing in digital interconnect applications.
FAQ
What is the maximum continuous current rating for SN74CBT1G384DCKT?
The SN74CBT1G384DCKT supports a continuous channel current of 128 mA per channel, as specified in its Absolute Maximum Ratings table. This rating applies across the full operating temperature range (–40°C to +85°C) and ensures reliable conduction without thermal runaway when used within recommended voltage and layout guidelines. Exceeding this current may degrade on-resistance stability or accelerate wear-out mechanisms.
Does SN74CBT1G384DCKT support bidirectional signal flow?
Yes, SN74CBT1G384DCKT supports true bidirectional signal flow between its A and B terminals. As a passive FET switch with no internal directionality, it passes analog or digital signals equally well from A to B or B to A when enabled. This behavior is confirmed in the function table and logic diagram, and is essential for applications like bus sharing and level translation where signal polarity or source/sink roles may reverse.
What is the recommended decoupling strategy for SN74CBT1G384DCKT?
A 0.1-µF ceramic capacitor should be placed as close as possible to the VCC and GND pins of SN74CBT1G384DCKT to suppress high-frequency switching noise and stabilize the internal gate drive. TI recommends using X7R dielectric with low ESL construction, mounted directly adjacent to the SC-70 package. No bulk capacitance is required due to the device's ultra-low ICC (1 µA typical), but shared VCC rails with other high-speed logic should include additional local decoupling.
Can SN74CBT1G384DCKT operate at 3.3 V supply?
No, SN74CBT1G384DCKT is not rated for 3.3 V operation. Its Recommended Operating Conditions specify a minimum VCC of 4 V and maximum of 5.5 V. At 3.3 V, the on-state resistance rises significantly (exceeding 15 Ω), and TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) cannot be guaranteed. For 3.3-V systems, consider alternatives such as SN74LVC1G3157 or SN74AUC1G66.
Is SN74CBT1G384DCKT RoHS compliant and lead-free?
Yes, SN74CBT1G384DCKT is RoHS compliant and features a lead-free NIPDAU (nickel/palladium/gold) or pure tin (SN) lead finish, as confirmed in TI's Packaging Information addendum. It meets JEDEC MSL Level-1 rating with peak reflow temperature of 260°C, and carries full exemption documentation for hazardous substances compliance. All production lots shipped since 2006 meet RoHS Directive 2011/65/EU requirements.
SN74CBT1G384DCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 1
- 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:
- SC-70-5
SN74CBT1G384DCKT FAQ
1.How can I place an order for SN74CBT1G384DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT1G384DCKT 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 SN74CBT1G384DCKT reliable?
The price and inventory of SN74CBT1G384DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT1G384DCKT is usually 5 days.
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Once your SN74CBT1G384DCKT 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 SN74CBT1G384DCKT?
For technical support, including SN74CBT1G384DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT1G384DCKT requirements.
6.How does Aetrix verify that SN74CBT1G384DCKT is sourced from the original manufacturer or authorized distributors?
All SN74CBT1G384DCKT 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 SN74CBT1G384DCKT meets industry standards.
7.What is the process for return or replacement of SN74CBT1G384DCKT?
All SN74CBT1G384DCKT units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT1G384DCKT, 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 SN74CBT1G384DCKT part is unused and in its original packaging.
Return procedure for SN74CBT1G384DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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