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Texas Instruments SN74CBTD1G384DBVT
- Part No.:
- SN74CBTD1G384DBVT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SN74CBTD1G384DBVT.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74CBTD1G384DBVT 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. Used in mixed-voltage I/O interfacing on embedded microcontroller peripheral buses.
For engineers reviewing the SN74CBTD1G384DBVT datasheet, SN74CBTD1G384DBVT pinout, SN74CBTD1G384DBVT application, or SN74CBTD1G384DBVT equivalent, key selection criteria include on-resistance matching, level-shifting capability under fast-edge conditions, latch-up immunity (>100 mA), thermal impedance (206°C/W), and SOT-23 (DBV) package compatibility with high-density PCB layouts.
Technical Context
The SN74CBTD1G384DBVT 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 VCC-referenced diode enables 5-V-to-3.3-V level shifting without external components.
Switching is governed by positive-logic control: OE low connects A↔B; OE high isolates ports. Propagation delay is 0.25 ns (typical), enable/disable times are 2–5.9 ns and 1–4.7 ns respectively, and it meets JESD 78 Class II latch-up immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance | 5 Ω (typical at VCC = 4.5 V, II = 30 mA) - ensures minimal voltage drop and signal integrity in high-speed data paths |
| Supply voltage range | 4.5–5.5 V - compatible with standard 5-V logic rails while supporting tight tolerance margins |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V - guarantees reliable TTL-level compatibility without level translators |
| Propagation delay | 0.25 ns (typical, CL = 50 pF) - supports >1 GHz signal switching in high-frequency digital interfaces |
| Latch-up immunity | >100 mA per JESD 78 Class II - provides robust fault tolerance in noisy industrial environments |
| Thermal impedance | 206°C/W (DBV package) - defines maximum power dissipation limit (128 mA continuous) under ambient thermal constraints |
| Operating temperature | –40°C to 85°C - validated for extended use in automotive body electronics and industrial controllers |
Pinout & Package
SOT-23 (DBV) 5-pin surface-mount package, 1.45 mm max height, JEDEC MO-178 compliant, with exposed metal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A) | Input/Output port A | Bidirectional signal terminal; connects to 5-V domain side of level-shifted interface |
| 2 (GND) | Ground reference | Primary return path for switch current and control logic; must be low-impedance for noise immunity |
| 3 (VCC) | Power supply | 5-V supply input; powers internal diode clamp and switch bias circuitry |
| 4 (OE) | Output-enable control | Active-low enable; high state disconnects A/B ports, low state enables bidirectional conduction |
| 5 (B) | Input/Output port B | Bidirectional signal terminal; connects to 3.3-V domain side of level-shifted interface |
Key Features
| Feature | Design Value |
|---|---|
| Integrated level-shifting diode | Enables direct 5-V-to-3.3-V signal translation without external components, reducing BOM count and layout area |
| TTL-compatible OE input | Accepts standard 5-V TTL logic levels (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating need for dedicated OE-level translators |
| Low on-state resistance | 5 Ω typical ensures <150 mV voltage drop at 30 mA, preserving signal swing in high-speed data lines |
| Fast switching performance | 0.25 ns propagation delay and sub-6 ns enable time support operation in >1 GHz clock domains |
| JESD 78 Class II latch-up immunity | Withstands >100 mA transient faults without destructive latch-up, critical for hot-swap and ESD-prone systems |
Applications
| Microcontroller I/O Expansion | Legacy Peripheral Interface |
|---|---|
Use Scenario: Connecting 5-V legacy peripherals (e.g., UART transceivers, SPI EEPROMs) to modern 3.3-V microcontrollers with limited I/O voltage tolerance. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch enabling safe, low-latency signal transfer between mismatched voltage domains. Use Value: Eliminates need for discrete resistor-divider or active translator circuits, reducing component count and board space by >40%. | Use Scenario: Interfacing 5-V FPGA configuration memory or debug interfaces to 3.3-V host processors in reconfigurable computing modules. IC Role / Device Role / Timing Role: High-speed, low-skew signal bridge with sub-nanosecond propagation delay preserving timing margins in configuration data streams. Use Value: Maintains setup/hold timing integrity at 100+ MHz clock rates without added jitter or skew penalties. |
| Industrial Sensor Hub | Automotive Body Control Module |
Use Scenario: Aggregating analog sensor outputs conditioned by 5-V op-amps into a 3.3-V ADC subsystem within compact sensor fusion nodes. IC Role / Device Role / Timing Role: Signal isolation and voltage translation gate controlled by MCU GPIO to enable/disable sensor channels on demand. Use Value: Enables dynamic channel power gating, reducing system standby current by up to 2.5 mA per switched channel. | Use Scenario: Routing LIN bus diagnostic signals or CAN transceiver status flags between 5-V power management ICs and 3.3-V microcontrollers in body control units. IC Role / Device Role / Timing Role: Fault-isolated signal coupler with latch-up immunity exceeding automotive transient requirements (ISO 7637-2 Pulse 5a). Use Value: Survives load-dump events up to 120 V without latch-up, avoiding system resets during battery disconnection/reconnection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G3157DBVR | Lower VCC range (1.65–5.5 V), higher on-resistance (6.5 Ω typ), no integrated level-shifting diode | Requires external biasing for 5-V-to-3.3-V translation; suited for single-supply 3.3-V systems | Select when operating below 4.5 V or when level-shifting is handled elsewhere in the signal chain |
| 74AUP1G3157GW,125 | Ultra-low ICC (0.9 µA max), wider VCC (0.8–3.6 V), no 5-V tolerance on inputs | Not rated for 5-V input signals; intended for ultra-low-power 1.8/2.5/3.3-V only designs | Select only for battery-powered 3.3-V-only applications where 5-V signal presence is guaranteed absent |
Compared with SN74CBTD1G384DBVT, SN74LVC1G3157DBVR offers broader supply flexibility but requires external level-shifting infrastructure, while 74AUP1G3157GW,125 achieves nanowatt static power at the cost of 5-V input incompatibility-making SN74CBTD1G384DBVT uniquely suited for mixed-voltage industrial and automotive I/O bridging where integrated diode-based translation and latch-up robustness are mandatory.
Availability
SN74CBTD1G384DBVT is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, and embedded microcontroller I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74CBTD1G384DBVT 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 for industrial, automotive, and personal electronics markets.
The SN74CBTD1G384DBVT belongs to TI's 74CBT family of advanced bus switches, engineered specifically for high-speed, low-distortion signal routing in mixed-voltage digital systems with stringent reliability requirements.
FAQ
What is the maximum continuous current rating for the SN74CBTD1G384DBVT?
The SN74CBTD1G384DBVT supports a continuous channel current of 128 mA, verified per absolute maximum ratings in the official TI datasheet SCDS066K. This rating applies under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to 85°C) and assumes proper PCB thermal design with adequate copper pour on the GND pad. Exceeding this current may trigger thermal shutdown or degrade long-term reliability.
Does the SN74CBTD1G384DBVT support true bidirectional level shifting between 5-V and 3.3-V domains?
Yes, the SN74CBTD1G384DBVT integrates a VCC-referenced diode that enables passive 5-V-to-3.3-V level shifting from A to B port. However, level shifting is asymmetric: signals from 5-V A to 3.3-V B are translated, but 3.3-V signals driven into B do not shift up to 5-V at A. The device functions as a bidirectional switch with unidirectional level translation capability, confirmed in the Functional Description section of TI's SCDS066K datasheet.
What is the thermal impedance (θJA) of the SN74CBTD1G384DBVT in its DBV package?
The SN74CBTD1G384DBVT in the SOT-23 (DBV) package has a junction-to-ambient thermal impedance (θJA) of 206°C/W, as specified in the Absolute Maximum Ratings table of TI's SCDS066K datasheet. This value assumes standard JEDEC test board conditions (2-layer board, 1-in² copper). Actual thermal performance improves with enhanced PCB copper area and thermal vias beneath the GND pad.
Can the SN74CBTD1G384DBVT be used in systems with fast edge rates above 100 MHz?
Yes, the SN74CBTD1G384DBVT delivers 0.25 ns typical propagation delay and sub-6 ns enable/disable times, making it suitable for signal routing in systems with edge rates up to 1 GHz. However, TI notes in the Recommended Operating Conditions that level-shifting effectiveness diminishes at high frequencies due to capacitive coupling; for >100 MHz applications, verify signal integrity with actual load capacitance (CL = 50 pF typical) and minimize trace length to preserve timing margins.
Is the SN74CBTD1G384DBVT pin-compatible with other 5-pin SOT-23 bus switches like the SN74LVC1G3157?
No, the SN74CBTD1G384DBVT is not pin-compatible with SN74LVC1G3157DBVR or similar devices. While both use SOT-23 (DBV) packages, the pin assignments differ: SN74CBTD1G384DBVT uses Pin 1=A, Pin 2=GND, Pin 3=VCC, Pin 4=OE, Pin 5=B; SN74LVC1G3157DBVR uses Pin 1=IN, Pin 2=GND, Pin 3=EN, Pin 4=VCC, Pin 5=OUT. Swapping them without board revision will cause functional failure and potential damage.
SN74CBTD1G384DBVT 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
SN74CBTD1G384DBVT FAQ
1.How can I place an order for SN74CBTD1G384DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTD1G384DBVT 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 SN74CBTD1G384DBVT reliable?
The price and inventory of SN74CBTD1G384DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD1G384DBVT is usually 5 days.
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Once your SN74CBTD1G384DBVT 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 SN74CBTD1G384DBVT?
For technical support, including SN74CBTD1G384DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD1G384DBVT requirements.
6.How does Aetrix verify that SN74CBTD1G384DBVT is sourced from the original manufacturer or authorized distributors?
All SN74CBTD1G384DBVT 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 SN74CBTD1G384DBVT meets industry standards.
7.What is the process for return or replacement of SN74CBTD1G384DBVT?
All SN74CBTD1G384DBVT units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD1G384DBVT, 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 SN74CBTD1G384DBVT part is unused and in its original packaging.
Return procedure for SN74CBTD1G384DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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