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Texas Instruments SN74CBTD1G384DBVR
- Part No.:
- SN74CBTD1G384DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SN74CBTD1G384DBVR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,354
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Product details
Overview
SN74CBTD1G384DBVR 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 voltage-level translation for I²C, SMBus, and low-speed data buses.
For engineers reviewing the SN74CBTD1G384DBVR datasheet, SN74CBTD1G384DBVR pinout, SN74CBTD1G384DBVR application, or SN74CBTD1G384DBVR equivalent, key selection criteria include on-resistance matching, level-shifting capability, propagation delay (<0.25 ns), latch-up immunity (>100 mA), and SOT-23 (DBV) package compatibility with high-density PCB layouts.
Technical Context
The SN74CBTD1G384DBVR implements a single NMOS pass-gate switch controlled by an active-low OE input, enabling/disabling bidirectional conduction between A and B ports. Its integrated diode-to-VCC structure enables automatic 5-V-to-3.3-V level shifting without external components.
It operates under strict DC conditions: VCC = 4.5–5.5 V, VI/O = –0.5–7 V, and supports continuous channel current up to 128 mA. The device meets JESD 78 Class II latch-up immunity and exhibits low input capacitance (2 pF) and off-state I/O capacitance (3.5 pF), minimizing signal integrity impact in high-speed digital interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance | 5–7 Ω at VCC = 4.5 V; ensures minimal voltage drop and power loss during signal transmission. |
| Propagation delay | 0.25 ns max (CL = 50 pF); supports high-speed digital switching without timing bottlenecks. |
| Supply voltage range | 4.5–5.5 V; compatible with standard 5-V logic rails while maintaining robust noise margins. |
| Control input levels | VIH = 2 V, VIL = 0.8 V; fully TTL-compatible, eliminating need for level translators on OE line. |
| Operating temperature | –40°C to 85°C; qualified for industrial-grade embedded systems and automotive body electronics. |
| Off-state capacitance | 3.5 pF; reduces crosstalk and loading on adjacent traces in dense routing environments. |
| Latch-up immunity | >100 mA per JESD 78 Class II; ensures reliability in noisy or transient-prone power domains. |
Pinout & Package
SOT-23 (DBV) 5-pin package: compact 2.9 mm × 1.6 mm footprint with 0.95 mm pin pitch, optimized for space-constrained PCBs and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A) | Input/Output port A | Bidirectional signal terminal; connects to higher-voltage (e.g., 5-V) side of level-shifted interface. |
| 2 (GND) | Ground reference | Provides return path for internal switch and control circuitry; must be low-impedance for stable operation. |
| 3 (OE) | Output-enable control | Active-low enable; drives high to disconnect A–B path, isolating domains during power sequencing or fault conditions. |
| 4 (VCC) | Power supply | Supplies 4.5–5.5 V; powers internal level-shifting diode and gate drive; referenced for OE logic thresholds. |
| 5 (B) | Input/Output port B | Bidirectional signal terminal; connects to lower-voltage (e.g., 3.3-V) side, with clamping via on-chip diode to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated level shifting | Enables direct 5-V-to-3.3-V signal translation without external resistors or translators, reducing BOM count and layout area. |
| Low on-resistance | 5–7 Ω typical ensures <50 mV voltage drop at 10 mA, preserving logic high/low margins across the switch. |
| TTL-compatible OE input | Accepts standard 5-V TTL logic levels, allowing direct connection to microcontroller GPIO or FPGA I/O without buffering. |
| High-speed switching | 0.25 ns propagation delay supports >1 GHz effective toggle rates, suitable for fast control signaling and clock distribution. |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II, preventing destructive failure during ESD events or supply transients. |
Applications
| I²C Bus Level Translation | SMBus Power Management Interface |
|---|---|
Use Scenario: Interfacing a 5-V microcontroller I²C master with 3.3-V sensor slaves on shared SDA/SCL lines. IC Role / Device Role / Timing Role: Bidirectional level translator placed inline on both SDA and SCL lines to maintain protocol compliance and timing integrity. Use Value: Eliminates pull-up resistor conflicts and voltage overshoot risks, ensuring reliable ACK/NACK timing and clock stretching behavior. | Use Scenario: Connecting a 5-V system management controller to 3.3-V PMICs or battery monitors over SMBus. IC Role / Device Role / Timing Role: Signal isolation and voltage domain bridging for command/response transactions at up to 100 kHz. Use Value: Maintains strict SMBus timing budgets (tBUF, tHD:STA) while preventing damage from 5-V logic overshoot on 3.3-V receivers. |
| Legacy Peripheral Interface | Hot-Swap Signal Isolation |
Use Scenario: Integrating legacy 5-V UART or GPIO peripherals into modern 3.3-V SoC-based designs. IC Role / Device Role / Timing Role: Unidirectional or bidirectional signal conduit with configurable enable control for power-aware operation. Use Value: Enables seamless interoperability without redesigning peripheral firmware or adding discrete level-shifter ICs. | Use Scenario: Isolating hot-plug detection or status signals between 5-V backplane and 3.3-V module during insertion/removal. IC Role / Device Role / Timing Role: Controlled signal gate activated only after power stabilization, preventing false triggers during ramp-up. Use Value: Reduces risk of metastability and glitch propagation by decoupling domains until both supplies are valid. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G3157DBVR | Lower VCC range (1.65–5.5 V); no integrated level-shifting diode; requires external biasing for 5-V-to-3.3-V translation. | Best suited for single-supply or mixed-voltage systems where level shifting is handled elsewhere; lacks native 5-V-to-3.3-V capability. | Select when lower supply flexibility is needed and external level-shifting is acceptable or already present. |
| TS5A23157DCUR | Higher on-resistance (8–12 Ω); dual-channel configuration; supports 1.65–5.5 V; no integrated VCC-referenced diode. | Used in dual-signal paths (e.g., audio/data pair); requires external circuitry for level shifting; not drop-in compatible. | Choose for dual-switch needs or when board space allows two independent channels instead of one dedicated level shifter. |
Compared with SN74CBTD1G384DBVR, SN74LVC1G3157DBVR offers broader supply range but forfeits autonomous level shifting, while TS5A23157DCUR provides dual-channel density at the cost of higher Ron and no native 5-V-to-3.3-V support-making SN74CBTD1G384DBVR uniquely optimal for single-channel, self-contained voltage translation.
Availability
SN74CBTD1G384DBVR is available at Aetrix Electronics and suitable for industrial automation interfaces, embedded sensor hubs, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for SN74CBTD1G384DBVR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, scalability, and broad design support.
The SN74CBTD1G384DBVR belongs to TI's 74CBT logic family, engineered specifically for high-speed, low-distortion signal routing and voltage-domain bridging in mixed-voltage digital systems.
FAQ
What is the primary function of the SN74CBTD1G384DBVR?
The SN74CBTD1G384DBVR is a single-channel FET bus switch with integrated level shifting, enabling bidirectional signal transfer between 5-V and 3.3-V logic domains. Its core function is to provide low-resistance, high-speed signal routing while automatically translating voltage levels using an on-chip diode to VCC. This eliminates external components in mixed-voltage interfaces, making SN74CBTD1G384DBVR ideal for I²C, SMBus, and GPIO bridging applications where timing integrity and layout simplicity are critical.
Does the SN74CBTD1G384DBVR require external pull-up resistors on the B port?
No, the SN74CBTD1G384DBVR does not require external pull-up resistors on the B port for level-shifting operation. Its internal diode-to-VCC structure provides inherent clamping that enables 5-V-to-3.3-V translation without external biasing. However, standard I²C or SMBus pull-ups remain necessary on both A and B sides per protocol requirements-not for level shifting, but to establish proper bus idle states and meet rise-time specifications defined in those standards. SN74CBTD1G384DBVR itself does not replace protocol-compliant pull-up networks.
Can the SN74CBTD1G384DBVR operate with a 3.3-V supply voltage?
No, the SN74CBTD1G384DBVR is not rated for 3.3-V VCC operation. Its recommended operating supply range is strictly 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. Operating below 4.5 V may result in insufficient gate drive for the internal FET, increased on-resistance, unreliable level shifting, and failure to meet TTL input threshold specifications (VIH = 2 V, VIL = 0.8 V). For 3.3-V supply systems, alternative devices such as SN74LVC1G3157DBVR should be considered-but note SN74CBTD1G384DBVR requires 5-V rail to function correctly.
How does the OE pin behave in the SN74CBTD1G384DBVR?
The OE (output-enable) pin on the SN74CBTD1G384DBVR is active-low: when OE is logic low (≤0.8 V), the A–B switch is enabled and conducts bidirectionally; when OE is logic high (≥2 V), the switch disconnects, presenting high impedance between A and B. OE is TTL-compatible and must be driven to either VCC or GND-floating or slow-ramped OE signals can cause undefined switching states or increased ICC. All unused control inputs, including OE, must be tied to VCC or GND to ensure stable operation of SN74CBTD1G384DBVR in real-world designs.
Is the SN74CBTD1G384DBVR RoHS compliant and lead-free?
Yes, the SN74CBTD1G384DBVR is RoHS compliant and lead-free. Per TI's packaging documentation, the part carries "Yes" for RoHS compliance and uses NIPDAU or pure tin (SN) lead finish. It is rated MSL Level-1 (unlimited floor life) with peak reflow temperature of 260°C, suitable for standard Pb-free soldering processes. The DBV package (SOT-23) is fully qualified for industrial and automotive applications, and SN74CBTD1G384DBVR meets JEDEC J-STD-020 moisture sensitivity requirements without special handling.
SN74CBTD1G384DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
SN74CBTD1G384DBVR FAQ
1.How can I place an order for SN74CBTD1G384DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD1G384DBVR 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 SN74CBTD1G384DBVR reliable?
The price and inventory of SN74CBTD1G384DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD1G384DBVR is usually 5 days.
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SN74CBTD1G384DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTD1G384DBVR 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 SN74CBTD1G384DBVR?
For technical support, including SN74CBTD1G384DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD1G384DBVR requirements.
6.How does Aetrix verify that SN74CBTD1G384DBVR is sourced from the original manufacturer or authorized distributors?
All SN74CBTD1G384DBVR 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 SN74CBTD1G384DBVR meets industry standards.
7.What is the process for return or replacement of SN74CBTD1G384DBVR?
All SN74CBTD1G384DBVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD1G384DBVR, 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 SN74CBTD1G384DBVR part is unused and in its original packaging.
Return procedure for SN74CBTD1G384DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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