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Texas Instruments SN74CB3T3384DBQR
- Part No.:
- SN74CB3T3384DBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CB3T3384DBQR.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,820
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Product details
Overview
SN74CB3T3384DBQR from Texas Instruments is a 10-bit FET bus switch IC with dual 5-bit configurable operation, 5 Ω typical ON-state resistance, 0.25 ns max propagation delay at 3.3 V, and 2.3–3.6 V VCC operation. It enables bidirectional voltage-level translation across mixed-signal buses in memory interleaving and system isolation applications.
For engineers reviewing the SN74CB3T3384DBQR datasheet, SN74CB3T3384DBQR pinout, SN74CB3T3384DBQR application, or SN74CB3T3384DBQR equivalent, key selection factors include Ioff-enabled partial-power-down support, 5-V-tolerant I/Os with device powered up or down, 5 pF typical OFF-state I/O capacitance, and SSOP-24 package compatibility with space-constrained portable designs.
Technical Context
The SN74CB3T3384DBQR implements two independent 5-bit FET-based analog switches controlled by separate OE inputs (1OE, 2OE), supporting either dual 5-bit or single 10-bit bus switching configurations. Its gate drive architecture tracks VCC to enable output voltage translation matching the supply rail.
Each switch channel features undervoltage clamp diodes on data I/Os, supports 0–5 V signaling levels (including 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5 V), and maintains high-impedance isolation when disabled - with Ioff limiting backflow current during partial power-down states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - defines minimum/maximum supply for guaranteed logic and analog switching operation |
| ron (Typ) | 5 Ω - ensures minimal signal attenuation and voltage drop across active switch paths |
| tpd (Max) | 0.25 ns at 3.3 V - enables high-speed digital bus switching without timing bottlenecks |
| Cio(OFF) (Typ) | 5 pF - reduces capacitive loading on upstream drivers and adjacent traces |
| Ioff (Max) | 10 µA at VCC = 0 V - prevents damaging current flow during system power sequencing |
| VI/O Range | 0 V to 5.5 V - allows interoperability with legacy 5-V TTL, modern 1.8-V/2.5-V CMOS, and mixed-voltage buses |
| ICC (Max) | 40 µA - supports ultra-low static power in battery-powered portable equipment |
Pinout & Package
SN74CB3T3384DBQR uses a 24-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 7.9 mm × 4.5 mm body size, and 1.2 mm max height - optimized for compact PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output Enable Inputs | Active-low controls for respective 5-bit switch banks; tie to VCC via pullup for power-up high-impedance safety |
| 1A1–1A5, 2A1–2A5 | Switch Input Ports | Source-side terminals of FET switches; accept 0–5.5 V signals regardless of VCC state |
| 1B1–1B5, 2B1–2B5 | Switch Output Ports | Sink-side terminals; output voltage tracks VCC when enabled, isolates when disabled |
| VCC | Supply Voltage | Power rail defining translation level and internal bias; must be stable between 2.3 V and 3.6 V |
| GND | Ground Reference | Common return path for all control and I/O circuits; requires low-impedance PCB connection |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Output level dynamically tracks VCC - enables seamless interface between 5-V, 3.3-V, 2.5-V, and sub-2-V logic domains |
| 5-V-tolerant I/Os | Operates with 0–5.5 V signals on A/B ports even when VCC = 2.3 V or device is unpowered - eliminates external level shifters |
| Bidirectional zero-delay switching | Sub-nanosecond propagation (0.25 ns max) and near-zero RC delay - preserves signal integrity in high-speed parallel buses |
| Ioff partial-power-down protection | Blocks reverse current flow when VCC = 0 V - prevents backfeeding and latch-up in hot-swap or multi-rail systems |
| Low OFF-state capacitance | 5 pF typical Cio(OFF) - minimizes crosstalk and timing skew in dense interconnect environments |
Applications
| Memory Interleaving | Hot-Swappable Backplane Interface |
|---|---|
|
Use Scenario: Isolating two DRAM banks sharing a common address/data bus while enabling independent refresh cycles. IC Role / Device Role / Timing Role: Bidirectional 10-bit bus switch that enables/disables physical connectivity between controller and memory banks under software control. Use Value: Eliminates bus contention during bank switching and reduces system-level timing uncertainty with sub-0.3 ns propagation delay. |
Use Scenario: Connecting a field-replaceable module to a powered-backplane without disrupting active system operation. IC Role / Device Role / Timing Role: Ioff-enabled isolation barrier that blocks power domain interaction during insertion/removal of live cards. Use Value: Prevents backdrive damage and system reset events by limiting leakage to ≤10 µA when VCC = 0 V. |
| Portable SoC Power Domain Bridging | Legacy Peripheral Interface Adapter |
|
Use Scenario: Interfacing a 1.8-V mobile processor GPIO bank to a 3.3-V SD card slot while maintaining low standby current. IC Role / Device Role / Timing Role: Voltage-translating bus switch operating at 2.5-V VCC to translate 1.8-V logic up to ~2.5-V output swing. Use Value: Achieves <100 nA total quiescent current per switch bank and supports dynamic voltage scaling without level-shifter reconfiguration. |
Use Scenario: Adding USB 1.1 or RS-232 transceivers to a modern microcontroller with only 3.3-V I/Os. IC Role / Device Role / Timing Role: 5-V-tolerant signal bridge allowing legacy 5-V peripherals to connect directly to 3.3-V host without external clamping or resistors. Use Value: Reduces BOM count by eliminating discrete protection diodes and pull-up networks required for 5-V signal compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DBQR | Higher VCC range (4.5–5.5 V); no Ioff; 3.5 Ω ron; 5-V-only operation | Requires 5-V supply; lacks partial-power-down capability; suited for fixed-rail industrial backplanes | Select when system operates exclusively at 5 V and Ioff is unnecessary |
| SN74LVC1G3157DCKR | Single-channel SPDT; 3.3-V only; 10 Ω ron; 5.5-V tolerant I/Os; SC70-6 package | Not scalable to 10-bit; limited to point-to-point routing; unsuitable for parallel bus isolation | Choose for low-pin-count, low-density signal routing where space is critical and bus width is narrow |
Compared with SN74CB3T3384DBQR, SN74CBTD3384DBQR offers lower ON-resistance but sacrifices Ioff and mixed-voltage flexibility, while SN74LVC1G3157DCKR provides footprint efficiency at the cost of channel count and translation versatility - making SN74CB3T3384DBQR optimal for scalable, multi-rail, high-density bus isolation.
Availability
SN74CB3T3384DBQR is available at Aetrix Electronics and suitable for memory subsystems, hot-pluggable modules, portable SoC interfaces, and legacy peripheral adapters requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for SN74CB3T3384DBQR 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 decades of expertise in high-reliability interface and signal-path solutions.
The SN74CB3T3384DBQR belongs to TI's CB3T family of FET bus switches, engineered specifically for low-latency, mixed-voltage bus isolation in portable, industrial, and communications infrastructure equipment.
FAQ
What is the maximum allowable VI/O voltage for SN74CB3T3384DBQR when VCC = 0 V?
The SN74CB3T3384DBQR supports VI/O from −0.5 V to 7 V regardless of VCC state. When VCC = 0 V, data I/O pins remain 5-V tolerant with no risk of damage, and Ioff limits reverse current to ≤10 µA - enabling safe hot-insertion into live 5-V buses without auxiliary protection circuitry.
Can SN74CB3T3384DBQR translate 1.2-V logic to 2.5-V levels?
Yes. The SN74CB3T3384DBQR supports user-defined voltage translation: with VCC = 2.5 V, it translates 1.2-V input signals to approximately 2.5-V output levels (tracking VCC), verified across 0–5.5 V input range per Figure 1 in the datasheet. This behavior holds for all supported VCC values from 2.3 V to 3.6 V.
Does SN74CB3T3384DBQR require external pull-up resistors on OE pins?
Yes. To ensure high-impedance state during power-up or power-down, OE pins (1OE, 2OE) must be tied to VCC through external pull-up resistors. Minimum resistor value depends on driver sink capability; TI recommends evaluating based on worst-case IIH (≤10 µA) and system noise margins - typical values range from 10 kΩ to 100 kΩ.
What is the thermal resistance (θJA) of SN74CB3T3384DBQR in its SSOP package?
The SN74CB3T3384DBQR in DBQ (SSOP-24) package has a specified junction-to-ambient thermal resistance (θJA) of 61°C/W under standard JEDEC test conditions. This value assumes a 2-layer board with 1-in² copper pour; actual performance improves with enhanced PCB copper area and thermal vias.
How does SN74CB3T3384DBQR differ from SN74CB3T3384DWR?
The SN74CB3T3384DBQR and SN74CB3T3384DWR share identical electrical specifications and functionality, differing only in package and packaging format: SN74CB3T3384DBQR uses SSOP-24 (DBQ) in tape-and-reel (2500 pcs), while SN74CB3T3384DWR uses SOIC-24 (DW) in tape-and-reel (2000 pcs). Both operate over −40°C to +85°C and support identical VCC and I/O voltage ranges.
SN74CB3T3384DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 5 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74CB3T3384DBQR FAQ
1.How can I place an order for SN74CB3T3384DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T3384DBQR 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 SN74CB3T3384DBQR reliable?
The price and inventory of SN74CB3T3384DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T3384DBQR is usually 5 days.
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Once your SN74CB3T3384DBQR 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 SN74CB3T3384DBQR?
For technical support, including SN74CB3T3384DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T3384DBQR requirements.
6.How does Aetrix verify that SN74CB3T3384DBQR is sourced from the original manufacturer or authorized distributors?
All SN74CB3T3384DBQR 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 SN74CB3T3384DBQR meets industry standards.
7.What is the process for return or replacement of SN74CB3T3384DBQR?
All SN74CB3T3384DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T3384DBQR, 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 SN74CB3T3384DBQR part is unused and in its original packaging.
Return procedure for SN74CB3T3384DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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