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Texas Instruments SN74CBTD1G384DCKR
- Part No.:
- SN74CBTD1G384DCKR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
SN74CBTD1G384DCKR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,079
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Product details
Overview
SN74CBTD1G384DCKR 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 input levels (VIH = 2 V, VIL = 0.8 V), and operates across –40°C to 85°C. Used in voltage-domain interfacing within digital subsystems such as microcontroller I/O expansion and FPGA configuration buses.
For engineers reviewing the SN74CBTD1G384DCKR datasheet, SN74CBTD1G384DCKR pinout, SN74CBTD1G384DCKR application, or SN74CBTD1G384DCKR equivalent, key selection criteria include on-resistance matching, level-shifting capability under fast-edge conditions, thermal performance in SC-70 packaging, and compatibility with 5-V/3.3-V mixed-signal interface designs.
Technical Context
The SN74CBTD1G384DCKR implements a single NMOS transmission gate with an integrated diode-to-VCC structure enabling passive level shifting from 5-V inputs to 3.3-V outputs. Its OE-controlled switching path supports bidirectional signal flow with propagation delay under 0.25 ns and enable/disable times of 2–5.9 ns.
It operates within a 4.5–5.5-V supply range and exhibits latch-up immunity exceeding 100 mA per JESD 78 Class II. The device requires all unused control inputs tied to VCC or GND to prevent floating-node instability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance | 5 Ω typical at VCC = 4.5 V, enabling low-voltage-drop signal pass-through for high-speed data lines |
| Supply voltage range | 4.5 V to 5.5 V - ensures stable operation in standard 5-V digital rails with ±10% tolerance |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V - compatible with TTL logic families without level translation on OE pin |
| Propagation delay | 0.25 ns max - supports >1-GHz signal integrity in short-reach interconnect applications |
| Thermal impedance (θJA) | 252 °C/W - reflects SC-70 package's thermal limitation, requiring careful power budgeting above 50 mA |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and peripheral interface modules |
| Channel current rating | 128 mA continuous - defines maximum sustained current through A–B path without derating |
Pinout & Package
SN74CBTD1G384DCKR uses the SC-70 (DCK) 5-pin surface-mount package, measuring 2.15 mm × 1.40 mm × 1.10 mm (L × W × H), with gull-wing leads and pin 1 marked by an index area. Thermal pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A port | Bidirectional signal terminal connected to higher-voltage domain (e.g., 5-V MCU I/O) |
| 2 | GND | Ground reference for internal circuitry and substrate bias |
| 3 | OE | Active-low output-enable control; high disables A–B conduction path |
| 4 | VCC | Positive supply rail (4.5–5.5 V); powers internal level-shifting diode and gate drive |
| 5 | B port | Bidirectional signal terminal connected to lower-voltage domain (e.g., 3.3-V FPGA bank) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated level shifting | Enables direct 5-V-to-3.3-V signal translation without external components via on-chip diode-to-VCC architecture |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II - ensures robustness against transient-induced parasitic thyristor activation |
| TTL-compatible OE input | Accepts standard 5-V TTL logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating need for dedicated OE-level translators |
| Low on-capacitance | Cio(OFF) = 3.5 pF - minimizes signal loading and crosstalk in high-frequency bus environments |
| Fast switching | Enable time (ten) ≤ 5.9 ns and disable time (tdis) ≤ 4.7 ns - supports sub-100-MHz clocked data transfers |
Applications
| Microcontroller I/O Expansion | FPGA Configuration Interface |
|---|---|
Use Scenario: Interfacing legacy 5-V peripherals (e.g., EEPROM, UART transceivers) to modern 3.3-V microcontrollers with limited GPIO voltage tolerance. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch managing data/address lines during read/write cycles. Use Value: Eliminates discrete resistor-divider or active translator circuits, reducing BOM count and PCB area while maintaining signal integrity up to 100 MHz. | Use Scenario: Connecting 5-V configuration PROMs or flash memory to 3.3-V FPGA configuration pins during power-up and bitstream loading. IC Role / Device Role / Timing Role: Controlled signal bridge activated only during configuration phase via FPGA GPIO-driven OE. Use Value: Prevents overvoltage damage to FPGA configuration inputs while preserving setup/hold timing margins due to sub-nanosecond propagation delay. |
| Industrial Sensor Hub Interface | USB Peripheral Power Management |
Use Scenario: Aggregating multiple 5-V analog sensor outputs into a 3.3-V ADC front-end within compact industrial edge nodes. IC Role / Device Role / Timing Role: Signal path enabler with OE synchronized to ADC sampling window to isolate inactive channels. Use Value: Reduces channel-to-channel leakage (<3.5 pF off-capacitance) and maintains SNR by minimizing capacitive coupling between adjacent sensor lines. | Use Scenario: Isolating 5-V USB PHY power domain from 3.3-V host controller logic during suspend/resume transitions. IC Role / Device Role / Timing Role: Controlled isolation switch asserting OE during USB suspend to decouple VBUS-related noise from logic rails. Use Value: Enables clean power-state transitions without signal contention, leveraging 128-mA channel current rating for transient surge handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT1G384DBVR | SOT-23 (DBV) package; θJA = 206 °C/W; identical electrical specs and pinout | Better thermal performance in space-constrained layouts where SC-70 heat dissipation is limiting | Select when board layout allows larger footprint and thermal management prioritizes lower junction rise |
| SN74LVC1G3157DCKR | 3.3-V-only supply; no integrated level shifting; 6-Ω ron; supports 1.65–5.5-V I/O | Requires external level shifters for 5-V interfaces; suited for pure 3.3-V or dual-supply mixed-voltage systems | Choose when system already includes centralized level translation and lower static current (0.1 µA ICC) is critical |
Compared with SN74CBTD1G384DCKR, SN74CBT1G384DBVR offers improved thermal dissipation in SOT-23 but occupies more PCB area, while SN74LVC1G3157DCKR eliminates level-shifting capability but reduces quiescent current by three orders of magnitude-making it preferable in always-on low-power monitoring nodes where external translation is feasible.
Availability
SN74CBTD1G384DCKR is available at Aetrix Electronics and suitable for industrial sensor hubs, microcontroller I/O expansion, and FPGA configuration interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74CBTD1G384DCKR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBTD1G384DCKR belongs to TI's 74CBT logic family, engineered for high-speed, low-distortion signal routing in mixed-voltage digital systems where level translation and minimal propagation delay are essential.
FAQ
What is the maximum continuous current rating for the SN74CBTD1G384DCKR?
The SN74CBTD1G384DCKR supports a continuous channel current of 128 mA, verified per absolute maximum ratings in the official datasheet. This value applies to steady-state DC conduction between A and B ports under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to 85°C). Exceeding this current may trigger thermal shutdown or degrade long-term reliability, especially in the SC-70 package with its 252 °C/W thermal impedance.
Does the SN74CBTD1G384DCKR require external pull-up or pull-down resistors on the OE pin?
No, the SN74CBTD1G384DCKR does not require external pull-up or pull-down resistors on the OE pin, but all unused control inputs must be held at a defined logic level. Per TI's SCBA004 application report, OE must be actively driven to VCC (disable) or GND (enable); leaving it floating risks undefined switching behavior and increased ICC. The device's TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) allow direct connection to MCU GPIO without additional biasing.
Can the SN74CBTD1G384DCKR translate signals from 3.3-V to 5-V?
No, the SN74CBTD1G384DCKR is unidirectional in level-shifting capability: it translates 5-V inputs at the A port to 3.3-V-compatible outputs at the B port using an internal diode-to-VCC structure. Driving 3.3-V signals into A or B will not produce 5-V outputs. For bidirectional level shifting, a dedicated dual-supply translator like TXS0102 or discrete solution is required. The SN74CBTD1G384DCKR's architecture inherently limits translation to high-to-low voltage only.
What is the typical on-state resistance of the SN74CBTD1G384DCKR at 5-V supply?
The typical on-state resistance (ron) of the SN74CBTD1G384DCKR is 5 Ω at VCC = 4.5 V and II = 30 mA, and remains near 5–7 Ω across the full 4.5–5.5-V supply range per electrical characteristics tables. At exactly 5 V, the datasheet specifies 5 Ω (typical) under VI = 2.4 V and II = 15 mA test conditions. This low ron ensures minimal voltage drop and signal attenuation for high-speed digital signals routed through the A–B path.
Is the SN74CBTD1G384DCKR RoHS compliant and lead-free?
Yes, the SN74CBTD1G384DCKR is RoHS compliant and lead-free, with NIPDAU (nickel-palladium-gold) or pure tin (SN) lead finish as specified in TI's Packaging Information Addendum. It carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and meets JEDEC J-STD-020 reflow profile requirements up to 260°C peak. The "Yes" RoHS designation applies to all production lots shipped after TI's full compliance transition date, confirmed in the official package addendum dated 11-Nov-2025.
SN74CBTD1G384DCKR 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
SN74CBTD1G384DCKR FAQ
1.How can I place an order for SN74CBTD1G384DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD1G384DCKR 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 SN74CBTD1G384DCKR reliable?
The price and inventory of SN74CBTD1G384DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD1G384DCKR is usually 5 days.
3.What payment methods are accepted for SN74CBTD1G384DCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTD1G384DCKR transactions.
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4.How is shipping managed for SN74CBTD1G384DCKR?
SN74CBTD1G384DCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTD1G384DCKR 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 SN74CBTD1G384DCKR?
For technical support, including SN74CBTD1G384DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD1G384DCKR requirements.
6.How does Aetrix verify that SN74CBTD1G384DCKR is sourced from the original manufacturer or authorized distributors?
All SN74CBTD1G384DCKR 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 SN74CBTD1G384DCKR meets industry standards.
7.What is the process for return or replacement of SN74CBTD1G384DCKR?
All SN74CBTD1G384DCKR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD1G384DCKR, 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 SN74CBTD1G384DCKR part is unused and in its original packaging.
Return procedure for SN74CBTD1G384DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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