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Texas Instruments SN74CBT3384APW
- Part No.:
- SN74CBT3384APW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3384APW.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:520
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Product details
Overview
SN74CBT3384APW from Texas Instruments is a 10-bit FET bus switch IC with dual 5-bit independent channels, 5-Ω on-state resistance, TTL-compatible control inputs, and operation over −40°C to 85°C. It enables high-speed bidirectional signal routing in memory expansion, data multiplexing, and hot-swap I/O isolation applications.
For engineers reviewing the SN74CBT3384APW datasheet, SN74CBT3384APW pinout, SN74CBT3384APW application, or SN74CBT3384APW equivalent, key selection criteria include its 24-pin TSSOP package, dual OE-controlled switching, sub-1 ns propagation delay at 5 V, and 128 mA continuous channel current capability.
Technical Context
The SN74CBT3384APW implements two independent 5-bit FET-based analog switches, each controlled by a dedicated output-enable (OE) input operating at TTL logic levels. Its architecture provides true bidirectional signal flow with no internal directionality or level-shifting circuitry.
Each switch channel exhibits low on-resistance (5–7 Ω typical), minimal charge injection (<1 pC), and low off-capacitance (4.5 pF). The device operates without DC bias on signal paths and supports rail-to-rail analog/digital signal pass-through when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω typical - ensures minimal voltage drop and signal attenuation for 3.3 V/5 V digital buses. |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V - enables use in >1 GHz clock domain bridging and high-speed data multiplexing. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5 V TTL and mixed-voltage 3.3 V/5 V system interfaces. |
| Control input thresholds | VIL ≤ 0.8 V, VIH ≥ 2 V - guarantees robust noise margin and direct interfacing with legacy TTL outputs. |
| Channel current rating | 128 mA continuous - supports driving multiple CMOS loads or short PCB traces without derating. |
| Off-state capacitance (Cio) | 4.5 pF - minimizes crosstalk and loading on adjacent high-frequency signal lines. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade embedded control and communications equipment. |
Pinout & Package
TSSOP-24 (PW) package: 7.9 mm × 4.5 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable inputs | Active-low control: drives corresponding 5-bit switch ON when low; high-impedance isolation when high. |
| 1A1–1A5, 2A1–2A5 | Port A terminals (channel group 1 & 2) | Input/output nodes for first and second 5-bit data paths; bidirectional, no polarity constraint. |
| 1B1–1B5, 2B1–2B5 | Port B terminals (channel group 1 & 2) | Paired with respective A ports; identical electrical behavior - interchangeable as source/sink. |
| VCC, GND | Power supply and reference | Single 4–5.5 V supply only; no separate logic or analog rails required. |
Key Features
| Feature | Design Value |
|---|---|
| Low on-resistance matching | ≤1 Ω max mismatch between A/B pins in same channel - preserves signal integrity in differential or parallel bus routing. |
| TTL-compatible control | No level-shifter needed - directly driven by 74LS, 74F, or microcontroller GPIO without pull-ups or translators. |
| Bidirectional signal path | No direction pin or internal bias - supports upstream/downstream data flow depending on system topology. |
| High off-isolation | Typical off-leakage < ±1 μA - prevents unintended coupling in powered-down subsystems or standby modes. |
| Fast enable/disable timing | ten = 1.9 ns, tdis = 2.1 ns at 5 V - enables cycle-accurate bus arbitration and dynamic reconfiguration. |
Applications
| Memory Expansion Interface | Data Bus Multiplexing |
|---|---|
Use Scenario: Expanding address/data bus width between MCU and external SRAM or Flash using shared physical traces. IC Role / Device Role / Timing Role: Bidirectional 10-bit bus switch isolating memory banks during access arbitration. Use Value: Eliminates need for discrete transceivers or complex glue logic while maintaining sub-nanosecond timing alignment. |
Use Scenario: Routing sensor data from multiple ADCs to a single processor input port under software control. IC Role / Device Role / Timing Role: Low-latency analog/digital signal selector enabling time-multiplexed sampling. Use Value: Preserves signal fidelity with <4.5 pF off-capacitance and avoids added jitter from active buffers. |
| Hot-Swap I/O Isolation | Legacy System Interfacing |
Use Scenario: Safely inserting/removing peripheral cards in live backplane systems without disrupting main controller operation. IC Role / Device Role / Timing Role: High-impedance barrier activated before card insertion and released after power stabilization. Use Value: Prevents bus contention and latch-up via fast 2.1 ns disable time and 128 mA fault-current tolerance. |
Use Scenario: Connecting modern 3.3 V FPGA I/O to legacy 5 V TTL peripherals like UARTs or display controllers. IC Role / Device Role / Timing Role: Voltage-transparent signal bridge supporting mixed-supply environments. Use Value: Enables interoperability without level-shifters, preserving rise/fall times and eliminating translation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384APW | Includes power-down control (1OE/2OE active-high with internal pull-down); higher ICC (30 μA vs 3 μA). | Better suited for systems requiring automatic high-Z state on power loss or reset assertion. | Select SN74CBTD3384APW if power-fail safety or auto-isolation is required; otherwise SN74CBT3384APW offers lower quiescent current. |
| 74LVC1G3157DP | Single-pole double-throw (SPDT) 2-channel; 5 V tolerant but only 2-bit capacity; 6 Ω ron. | Limited to point-to-point or dual-source routing; insufficient for full 10-bit bus handling. | Use 74LVC1G3157DP only for compact, low-pin-count signal switching; SN74CBT3384APW remains optimal for parallel bus isolation. |
Compared with SN74CBTD3384APW and 74LVC1G3157DP, the SN74CBT3384APW delivers superior channel density (10-bit), lowest static current (3 μA), and fastest propagation (0.25 ns), making it the preferred choice for high-throughput, low-power bus gating in industrial and telecom infrastructure.
Availability
SN74CBT3384APW is available at Aetrix Electronics and suitable for memory expansion, data bus multiplexing, hot-swap I/O isolation, and legacy system interfacing requiring stable component supply across industrial temperature ranges.
Supply support for SN74CBT3384APW 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-performance logic and interface solutions.
The SN74CBT3384APW belongs to TI's CBT (Crossbar Bus Transceiver) family, designed specifically for low-latency, low-distortion bidirectional signal routing in high-speed digital systems.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT3384APW?
The SN74CBT3384APW supports up to 128 mA continuous current per switched channel. This rating applies to any individual A–B path (e.g., 1A1–1B1) under recommended operating conditions (VCC = 4–5.5 V, TA = −40°C to 85°C), verified per TI's absolute maximum ratings table and confirmed in thermal derating curves for the TSSOP-24 package.
Does the SN74CBT3384APW require external pull-up or pull-down resistors on its OE inputs?
No, the SN74CBT3384APW does not require external pull-up or pull-down resistors on 1OE or 2OE inputs. Its TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) allow direct connection to microcontroller GPIO or logic gates. However, TI recommends tying unused OE inputs to VCC or GND to prevent floating states that could cause undefined switching behavior.
Can the SN74CBT3384APW be used to switch analog signals such as audio or sensor outputs?
Yes, the SN74CBT3384APW can switch analog signals including audio and sensor outputs because it uses FET-based transmission gates with rail-to-rail signal capability, no internal biasing, and low charge injection (<1 pC). Its 5–7 Ω on-resistance and 4.5 pF off-capacitance preserve bandwidth and minimize distortion for signals within DC–100 MHz range under proper layout practices.
What is the thermal resistance (θJA) of the SN74CBT3384APW in its TSSOP-24 package?
The SN74CBT3384APW in the TSSOP-24 (PW) package has a junction-to-ambient thermal resistance (θJA) of 88°C/W, as specified in TI's absolute maximum ratings table. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 2 oz Cu) and must be factored into power dissipation calculations when operating near maximum channel current limits.
Is the SN74CBT3384APW pin-compatible with other members of the CBT3384 family?
Yes, the SN74CBT3384APW shares identical pinout and function mapping with all CBT3384 variants in 24-pin packages (e.g., DW, DB, DBQ, DGV), including matching 1OE/2OE placement, A/B port ordering, and VCC/GND locations. Mechanical dimensions differ slightly between TSSOP (PW) and SSOP/SOIC, but PCB footprint compatibility is maintained per JEDEC MO-153 standards.
SN74CBT3384APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74CBT3384APW FAQ
1.How can I place an order for SN74CBT3384APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3384APW 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 SN74CBT3384APW reliable?
The price and inventory of SN74CBT3384APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3384APW is usually 5 days.
3.What payment methods are accepted for SN74CBT3384APW?
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SN74CBT3384APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3384APW 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 SN74CBT3384APW?
For technical support, including SN74CBT3384APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3384APW requirements.
6.How does Aetrix verify that SN74CBT3384APW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3384APW 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 SN74CBT3384APW meets industry standards.
7.What is the process for return or replacement of SN74CBT3384APW?
All SN74CBT3384APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3384APW, 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 SN74CBT3384APW part is unused and in its original packaging.
Return procedure for SN74CBT3384APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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