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Texas Instruments SN74CBT1G384DBVT
- Part No.:
- SN74CBT1G384DBVT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SN74CBT1G384DBVT.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:434
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Product details
Overview
SN74CBT1G384DBVT from Texas Instruments is a single-channel FET bus switch in SOT-23 (DBV) package, featuring 5-Ω on-state resistance, TTL-compatible OE control input, and bidirectional signal routing between A and B ports. It operates from 4 V to 5.5 V supply, supports –40°C to 85°C industrial temperature range, and is used for high-speed data path isolation in digital logic interfaces.
For engineers reviewing the SN74CBT1G384DBVT datasheet, SN74CBT1G384DBVT pinout, SN74CBT1G384DBVT application, or SN74CBT1G384DBVT equivalent, key selection criteria include on-resistance consistency across voltage, propagation delay under 0.35 ns at 5 V, low input capacitance (3 pF), and compatibility with 3.3-V/5-V mixed-signal systems requiring minimal loading and fast enable/disable timing.
Technical Context
The SN74CBT1G384DBVT implements a single NMOS pass transistor switch controlled by an active-low OE input. When OE is low, the A–B path conducts bidirectionally with near-zero propagation delay; when OE is high, the switch disconnects with 4 pF off-capacitance and high isolation.
Its design uses no internal level-shifting circuitry-input logic thresholds (VIH = 2 V, VIL = 0.8 V) match standard TTL levels, and it draws only 1 µA ICC at 5.5 V. The device avoids latch-up and supports hot-swap operation due to its FET-only architecture and absence of parasitic PN junction paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V, 30 mA - ensures minimal voltage drop and signal integrity in 50-Ω impedance-matched digital buses |
| Propagation delay (tpd) | 0.35 ns max at VCC = 5 V, CL = 50 pF - enables use in >1-GHz data paths without timing budget penalty |
| Enable time (ten) | 5.5 ns max at VCC = 5 V - allows rapid bus arbitration and dynamic channel switching |
| Off-capacitance (Cio(OFF)) | 4 pF at VO = 3 V or 0 V - minimizes crosstalk and capacitive loading on adjacent signal lines |
| Supply voltage range | 4 V to 5.5 V - compatible with both 5-V legacy systems and regulated 4.5-V rails |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
| Input capacitance (Ci) | 3 pF at VI = 3 V or 0 V - reduces drive strength requirements for upstream logic gates |
Pinout & Package
SOT-23 (DBV) 5-pin package, 1.45 mm max height, JEDEC MO-178 compliant, with exposed metal pad not present. Pin 1 marked via index area; pin 1 quadrant Q3 per tape orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A) | Data port A | Bidirectional I/O terminal; connects directly to source or sink logic without direction control |
| 2 (GND) | Ground reference | Return path for switch current and control logic; must be low-inductance connection for noise immunity |
| 3 (OE) | Output-enable input | Active-low TTL-compatible control; high = open-circuit isolation, low = 5–7 Ω conduction path |
| 4 (VCC) | Power supply | Supplies switch bias; decoupling capacitor required within 1 cm for stable high-speed operation |
| 5 (B) | Data port B | Bidirectional I/O terminal; electrically identical to pin 1; no internal polarity or direction logic |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω typical on-resistance | Enables <10 mV voltage drop at 2 mA, preserving logic high/low margins in 3.3-V and 5-V systems |
| TTL-compatible OE input | Accepts standard 0.8 V / 2.0 V logic thresholds-no external level shifter needed when driven by 74-series or microcontroller GPIO |
| 0.35 ns propagation delay | Supports clean edge transmission in sub-nanosecond timing windows, critical for DDR clock forwarding and test access ports |
| 4 pF off-capacitance | Limits capacitive coupling to <0.5% signal amplitude at 100 MHz, reducing crosstalk in dense PCB layouts |
| 1 µA quiescent current | Permits integration into always-on subsystems (e.g., wake-on-LAN, watchdog interfaces) without measurable power impact |
Applications
| PCI Express Lane Isolation | USB 2.0 Data Line Switching |
|---|---|
Use Scenario: Isolating PCIe Gen1/Gen2 lanes during hot-plug detection or power gating to prevent signal reflections and ground bounce. IC Role / Device Role / Timing Role: Bidirectional analog switch placed inline with TX/RX differential pairs to break DC continuity while preserving AC signal path integrity. Use Value: 5-Ω ron and 4 pF Cio(OFF) maintain impedance matching and minimize insertion loss (<0.2 dB at 2.5 GHz), enabling reliable link training after reconnection. | Use Scenario: Dynamically routing USB D+ and D− signals between host controller and dual-device ports in portable docking stations. IC Role / Device Role / Timing Role: Low-latency, bidirectional bus switch enabling software-controlled port selection without protocol-aware logic. Use Value: 0.35 ns tpd and 5.5 ns ten allow full-speed USB 2.0 (480 Mbps) handshaking to complete before switch state stabilizes, eliminating packet retries. |
| Microcontroller GPIO Expansion | Legacy Parallel Bus Multiplexing |
Use Scenario: Sharing limited MCU GPIO pins among multiple peripherals (e.g., SPI flash, I²C sensor, UART debug) using time-division access. IC Role / Device Role / Timing Role: Signal gate that enables/disables physical connection between MCU pin and peripheral I/O line based on firmware control. Use Value: 3 pF Ci and 1 µA ICC reduce capacitive loading and static power draw-critical for battery-powered edge nodes with 10+ switched I/O lines. | Use Scenario: Sharing a single 8-bit parallel bus (e.g., address/data multiplexed bus) between two memory devices in space-constrained industrial controllers. IC Role / Device Role / Timing Role: High-speed analog switch array replacing mechanical relays or discrete MOSFETs to route bus segments with nanosecond precision. Use Value: Matched 5–7 Ω ron across all channels ensures uniform timing skew (<50 ps) and eliminates setup/hold violations in 25-MHz parallel interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT1G384DCKT | Same silicon die, SC-70 (DCK) 5-pin package; 252 °C/W θJA vs. DBV's 206 °C/W; identical electrical specs | Smaller footprint (2.0 × 1.25 mm vs. 2.9 × 1.6 mm) but higher thermal resistance limits continuous 128-mA operation in compact enclosures | Select DCKT only when board area is constrained and peak current remains below 64 mA; DBVT preferred for thermal margin in industrial ambient |
| SN74LVC1G3157DBVR | CMOS analog switch; 10 Ω ron (min), 15 ns tpd, 3.6 V max VCC; includes ESD protection diodes not present in CBT family | Supports 1.65–3.6 V operation but lacks 5-V tolerance; higher delay precludes use in >100-MHz buses | Choose LVC1G3157DBVR for 3.3-V-only systems needing integrated ESD protection; avoid for 5-V logic or sub-ns timing-critical paths |
Compared with SN74CBT1G384DCKT, SN74CBT1G384DBVT offers lower thermal resistance for sustained current handling; compared with SN74LVC1G3157DBVR, it delivers 40× faster propagation and 5-V compatibility at the cost of no built-in ESD clamps-requiring external TVS if deployed in connector-facing locations.
Availability
SN74CBT1G384DBVT is available at Aetrix Electronics and suitable for industrial automation interfaces, USB peripheral switching, and microcontroller I/O expansion requiring stable component supply and long-term production continuity.
Supply support for SN74CBT1G384DBVT 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and connectivity solutions since 1930.
The SN74CBT1G384DBVT belongs to TI's CBT (Crossbar Bus Transceiver) family-designed specifically for high-speed, low-distortion digital signal routing in backplane, computing, and communications infrastructure where nanosecond timing and minimal loading are essential.
FAQ
What is the maximum continuous current rating for SN74CBT1G384DBVT?
The SN74CBT1G384DBVT supports a continuous channel current of 128 mA, verified per absolute maximum ratings in the official datasheet. This rating applies across the full operating temperature range (–40°C to +85°C) and assumes proper PCB thermal relief. Exceeding this current may cause thermal runaway or permanent degradation of the on-resistance performance in the SN74CBT1G384DBVT.
Does SN74CBT1G384DBVT support 3.3-V logic control inputs?
Yes, SN74CBT1G384DBVT accepts TTL-compatible control inputs: VIL ≤ 0.8 V and VIH ≥ 2.0 V, making it fully interoperable with 3.3-V CMOS and TTL logic families. However, the device itself requires a 4–5.5 V VCC supply-do not power SN74CBT1G384DBVT from 3.3 V, as functionality is not guaranteed below 4 V.
Can SN74CBT1G384DBVT be used in bidirectional data paths like I²C?
Yes, SN74CBT1G384DBVT is inherently bidirectional and has been successfully deployed in I²C bus extension and multiplexing applications. Its 5–7 Ω on-resistance adds negligible series resistance to pull-up networks, and its 4 pF off-capacitance prevents excessive bus capacitance buildup-key requirements for maintaining I²C timing compliance up to 400 kHz. Always verify total bus capacitance remains ≤400 pF when using SN74CBT1G384DBVT.
Is SN74CBT1G384DBVT RoHS compliant and lead-free?
Yes, SN74CBT1G384DBVT is RoHS compliant and features a lead-free NIPDAU/SN finish, as confirmed in TI's Packaging Information document dated 11-Nov-2025. It carries MSL Level-1 rating (260°C peak reflow, unlimited floor life) and meets JEDEC J-STD-020 moisture sensitivity requirements-suitable for standard Pb-free reflow profiles without special baking.
What is the function of the OE pin on SN74CBT1G384DBVT?
The OE (output-enable) pin on SN74CBT1G384DBVT is an active-low control input: when OE is logic low (≤0.8 V), the A–B switch closes with ~5–7 Ω resistance; when OE is logic high (≥2.0 V), the switch opens, isolating A and B with 4 pF off-capacitance. OE must never float-TI specifies all unused control inputs be tied to VCC or GND to ensure predictable operation of SN74CBT1G384DBVT.
SN74CBT1G384DBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- 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
SN74CBT1G384DBVT FAQ
1.How can I place an order for SN74CBT1G384DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT1G384DBVT 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 SN74CBT1G384DBVT reliable?
The price and inventory of SN74CBT1G384DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT1G384DBVT is usually 5 days.
3.What payment methods are accepted for SN74CBT1G384DBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT1G384DBVT transactions.
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SN74CBT1G384DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT1G384DBVT 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 SN74CBT1G384DBVT?
For technical support, including SN74CBT1G384DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT1G384DBVT requirements.
6.How does Aetrix verify that SN74CBT1G384DBVT is sourced from the original manufacturer or authorized distributors?
All SN74CBT1G384DBVT 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 SN74CBT1G384DBVT meets industry standards.
7.What is the process for return or replacement of SN74CBT1G384DBVT?
All SN74CBT1G384DBVT units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT1G384DBVT, 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 SN74CBT1G384DBVT part is unused and in its original packaging.
Return procedure for SN74CBT1G384DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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