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Texas Instruments SN74CBTD1G384DCKT
- Part No.:
- SN74CBTD1G384DCKT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SN74CBTD1G384DCKT.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
SN74CBTD1G384DCKT from Texas Instruments is a single-channel FET bus switch with integrated level shifting, 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 (VIH = 2 V, VIL = 0.8 V), and operates across –40°C to 85°C with 4.5–5.5-V supply. It is used in mixed-voltage I²C, SMBus, and GPIO interface bridging.
For engineers reviewing the SN74CBTD1G384DCKT datasheet, SN74CBTD1G384DCKT pinout, SN74CBTD1G384DCKT application, or SN74CBTD1G384DCKT equivalent, key selection criteria include on-resistance matching, level-shifting capability under fast-edge conditions, latch-up immunity (>100 mA), thermal impedance (252°C/W), and SC-70 package compatibility with high-density PCB layouts.
Technical Context
This device implements a single NMOS transmission gate with an integrated VCC-referenced diode for input-side clamping, enabling 5-V-to-3.3-V unidirectional level shifting when driven from higher-voltage sources. The OE control uses positive logic: low enables A↔B conduction; high disconnects both ports.
Switching performance is optimized for low-capacitance loads (CL = 50 pF), delivering 0.25-ns propagation delay and sub-6-ns enable/disable times. Its 128-mA continuous channel current rating and JESD 78 Class II latch-up compliance support robust operation in industrial and embedded interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, II = 30 mA - ensures minimal voltage drop and signal integrity in 3.3-V data paths |
| Supply voltage range | 4.5 V to 5.5 V - targets stable 5-V system rail operation with ±5% tolerance |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V - guarantees reliable TTL-level compatibility without external level translators |
| Propagation delay (tpd) | 0.25 ns typical at CL = 50 pF - supports high-speed digital switching up to >1 GHz effective bandwidth |
| Latch-up immunity | >100 mA per JESD 78 Class II - eliminates risk of destructive latch-up in mixed-voltage board environments |
| Thermal impedance (θJA) | 252°C/W (SC-70 package) - defines maximum power dissipation limit (~15 mW at ΔT = 38°C rise) |
| Operating temperature | –40°C to 85°C - qualified for industrial-grade embedded and automotive body electronics applications |
Pinout & Package
SN74CBTD1G384DCKT is housed in a 5-pin SC-70 (DCK) package measuring 2.15 mm × 1.40 mm × 1.10 mm (max height), optimized for space-constrained PCBs and reflow-compatible with standard SMT processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A) | Input/Output port A | Bidirectional signal terminal connected to source-side logic (e.g., 5-V microcontroller GPIO) |
| 2 (GND) | Ground reference | Return path for internal switch and control circuitry; must be low-impedance to minimize noise coupling |
| 3 (OE) | Output-enable control | Active-low TTL-compatible enable; drives switch ON when pulled ≤0.8 V, OFF when ≥2 V |
| 4 (B) | Input/Output port B | Bidirectional signal terminal connected to sink-side logic (e.g., 3.3-V sensor interface) |
| 5 (VCC) | Power supply | 5-V supply input powering internal clamp diode and switch bias; sets output high-level reference |
Key Features
| Feature | Design Value |
|---|---|
| Integrated level-shifting diode | Enables 5-V-to-3.3-V signal translation without external components, reducing BOM count and layout area |
| Low on-state resistance | 5 Ω typical minimizes insertion loss and maintains signal edge fidelity in high-speed digital buses |
| TTL-compatible OE input | Eliminates need for pull-up resistors or logic inverters when interfacing with legacy 5-V controllers |
| JESD 78 Class II latch-up immunity | Guarantees survivability during voltage transients or hot-plug events in mixed-rail systems |
| Sub-1 ns switching timing | Supports clean pass-through of fast clock edges and data strobes in I²C/SMBus repeater applications |
Applications
| I²C Bus Level Translation | SMBus Interface Bridging |
|---|---|
Use Scenario: Connecting a 5-V microcontroller I²C master to a 3.3-V EEPROM slave in an industrial control module. IC Role / Device Role / Timing Role: Bidirectional bus switch providing voltage-domain isolation while preserving SCL/SDA timing integrity. Use Value: Eliminates external level shifters and reduces interconnect capacitance, maintaining I²C timing margins at 400 kHz. | Use Scenario: Enabling communication between a 5-V baseboard management controller (BMC) and 3.3-V temperature sensors on a server motherboard. IC Role / Device Role / Timing Role: Single-pole analog switch acting as a programmable SMBus signal bridge with OE-controlled arbitration. Use Value: Supports hot-swap-safe SMBus transactions by isolating fault currents and preventing back-powering of 3.3-V rails. |
| GPIO Voltage Domain Isolation | Legacy Peripheral Interface |
Use Scenario: Routing GPIO signals from a 5-V FPGA I/O bank to a 3.3-V ADC in a test equipment front-end. IC Role / Device Role / Timing Role: Direction-agnostic signal conduit with controlled enable timing to prevent metastability during mode transitions. Use Value: Maintains <100 ps skew between parallel GPIO lines, critical for synchronous sampling alignment. | Use Scenario: Interfacing a 5-V legacy UART peripheral (e.g., RS-232 transceiver) to a 3.3-V SoC in a medical diagnostic device. IC Role / Device Role / Timing Role: Unidirectional level translator for TX line only, leveraging internal VCC diode for safe 5-V input clamping. Use Value: Avoids external Schottky diodes and resistor dividers, improving ESD robustness and reducing component count by 3×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G3157DCKR | Lower VCC range (1.65–5.5 V); no integrated level-shifting diode; 6 Ω ron | Requires external biasing for 5-V-to-3.3-V translation; better suited for single-supply 3.3-V systems | Select when operating from 3.3-V rail only and full 5-V input tolerance is not required |
| TS5A23157DCUR | Higher ron (8 Ω typ); dual-channel; 1.65–5.5-V operation; no VCC-referenced diode | Needs external clamping for 5-V inputs; supports independent channel control but lacks native level shifting | Choose for multi-signal routing where space allows dual-channel integration and external protection is acceptable |
Compared with SN74CBTD1G384DCKT, SN74LVC1G3157DCKR offers wider supply flexibility but requires external circuitry for 5-V-tolerant inputs, while TS5A23157DCUR provides channel independence at the cost of higher on-resistance and no built-in level-shifting capability-making SN74CBTD1G384DCKT uniquely suited for compact, self-contained 5-V-to-3.3-V bidirectional bridging.
Availability
SN74CBTD1G384DCKT is available at Aetrix Electronics and suitable for industrial automation interfaces, embedded sensor hubs, and mixed-voltage communication modules requiring stable component supply and long-term manufacturability assurance.
Supply support for SN74CBTD1G384DCKT 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 industrial, automotive, and communications markets.
The SN74CBTD1G384DCKT belongs to TI's 74CBT logic family, engineered specifically for low-latency, low-distortion signal routing in mixed-voltage digital systems where level translation and signal integrity are critical.
FAQ
What is the maximum continuous current rating for SN74CBTD1G384DCKT?
The SN74CBTD1G384DCKT supports a continuous channel current of 128 mA, verified per absolute maximum ratings in the official datasheet. This rating applies under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to 85°C) and ensures reliable conduction without thermal runaway or parametric shift. Exceeding this value may compromise latch-up immunity or long-term reliability.
Does SN74CBTD1G384DCKT support bidirectional level shifting?
SN74CBTD1G384DCKT enables 5-V-to-3.3-V level shifting only when signals originate from the A port (5-V side) due to its integrated VCC-referenced diode. It does not provide active 3.3-V-to-5-V translation; reverse-direction signals remain at 3.3-V levels. For true bidirectional translation, external circuitry or a dedicated dual-rail level shifter is required.
Can SN74CBTD1G384DCKT operate with a 3.3-V supply voltage?
No - SN74CBTD1G384DCKT requires a 4.5–5.5-V supply (VCC) to function correctly. Its internal level-shifting diode and switch biasing depend on 5-V operation. Applying 3.3 V to VCC violates recommended operating conditions and will result in undefined behavior, including failure to enable the switch or improper output voltage levels.
What is the thermal resistance (θJA) of SN74CBTD1G384DCKT in its SC-70 package?
The junction-to-ambient thermal resistance (θJA) for SN74CBTD1G384DCKT in the SC-70 (DCK) package is 252°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC high-K test board conditions and determines the maximum allowable power dissipation (e.g., ~15 mW for a 38°C rise above ambient) before thermal derating is needed.
Is SN74CBTD1G384DCKT pin-compatible with other 5-pin SC-70 bus switches?
SN74CBTD1G384DCKT follows the standard SC-70-5 pinout (A-GND-OE-B-VCC), matching industry conventions for single-channel switches like SN74LVC1G3157 and TS5A23157. However, functional differences - such as integrated level-shifting diodes, control logic polarity, and on-resistance - mean electrical compatibility must be verified per application; physical pin alignment alone does not guarantee drop-in replacement.
SN74CBTD1G384DCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- 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
SN74CBTD1G384DCKT FAQ
1.How can I place an order for SN74CBTD1G384DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD1G384DCKT 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 SN74CBTD1G384DCKT reliable?
The price and inventory of SN74CBTD1G384DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD1G384DCKT is usually 5 days.
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Once your SN74CBTD1G384DCKT 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 SN74CBTD1G384DCKT?
For technical support, including SN74CBTD1G384DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD1G384DCKT requirements.
6.How does Aetrix verify that SN74CBTD1G384DCKT is sourced from the original manufacturer or authorized distributors?
All SN74CBTD1G384DCKT 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 SN74CBTD1G384DCKT meets industry standards.
7.What is the process for return or replacement of SN74CBTD1G384DCKT?
All SN74CBTD1G384DCKT units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD1G384DCKT, 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 SN74CBTD1G384DCKT part is unused and in its original packaging.
Return procedure for SN74CBTD1G384DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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