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Texas Instruments SN74CBT3384APWR
- Part No.:
- SN74CBT3384APWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3384APWR.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
SN74CBT3384APWR 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 across −40°C to 85°C. It enables high-speed bidirectional signal routing in memory address/data buses, PCI local bus interfaces, and level-translating I/O expansion paths.
For engineers reviewing the SN74CBT3384APWR datasheet, SN74CBT3384APWR pinout, SN74CBT3384APWR application, or SN74CBT3384APWR equivalent, key selection criteria include on-resistance matching, propagation delay under 0.35 ns at 4 V, dual OE control for channel isolation, and TSSOP-24 package compatibility with high-density PCB layouts.
Technical Context
The SN74CBT3384APWR implements two independent 5-bit FET-based analog switches, each controlled by a dedicated output-enable (OE) input operating at TTL logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V). Its pass-gate architecture provides bidirectional signal flow with no internal latching or direction control.
Each switch channel exhibits low capacitance (Cio(OFF) = 4.5 pF), minimal charge injection, and rail-to-rail analog signal handling up to VCC = 5.5 V. The device draws only 3 μA ICC at 5.5 V and supports 128 mA continuous channel current per path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V - ensures minimal voltage drop and signal attenuation in high-speed digital or analog signal paths. |
| Propagation delay (tpd) | 0.35 ns max at VCC = 4 V - enables sub-nanosecond timing integrity for >1 GHz data rates in bus switching applications. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed-voltage systems without level-shifting circuitry. |
| Input capacitance (Ci) | 4 pF - reduces loading on upstream drivers and preserves signal edge rate in fan-out-critical designs. |
| Off-state capacitance (Cio) | 4.5 pF - minimizes crosstalk and capacitive coupling between isolated bus segments. |
| Enable/disable time (ten/tdis) | 6.2 ns / 5.5 ns max at VCC = 4 V - supports precise timing control for dynamic bus partitioning and hot-swap arbitration. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade embedded systems including motor control and instrumentation. |
Pinout & Package
TSSOP-24 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad not present, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Output-enable for Channel 1 (1A1–1A5 ↔ 1B1–1B5) | Active-low control: drives channel into low-Z conduction when logic low; high-Z isolation when high. |
| 2OE | Output-enable for Channel 2 (2A1–2A5 ↔ 2B1–2B5) | Independent enable allows asynchronous partitioning of two 5-bit data paths without shared timing constraints. |
| 1A1–1A5, 1B1–1B5 | Channel 1 bidirectional port terminals | Pin-for-pin symmetric I/O: either side may serve as source or sink depending on OE state and system topology. |
| 2A1–2A5, 2B1–2B5 | Channel 2 bidirectional port terminals | Electrically isolated from Channel 1; supports separate voltage domains if VCC is shared but signal references differ. |
| VCC | Positive supply | Must be decoupled locally; powers internal FET gates and defines logic threshold for OE inputs. |
| GND | Ground reference | Common return for all switch paths and control logic; critical for minimizing ground bounce in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Enables <10 mV voltage drop at 20 mA, preserving logic margins in 5-V TTL and LVTTL bus environments. |
| Dual independent OE controls | Permits selective activation of 5-bit segments-e.g., isolate address lines while passing data, or stagger enable timing to reduce simultaneous switching noise. |
| 0.35 ns propagation delay | Supports clean signal transmission through multiple cascaded switches without cumulative timing skew exceeding 1 ns over 3 stages. |
| TTL-compatible input levels | Accepts standard 5-V TTL outputs directly-no external pull-ups or level translators required for legacy controller interfacing. |
| High off-isolation (>50 dB @ 100 MHz) | Measured via Cio(OFF) = 4.5 pF and ron(off) > 1 GΩ - suppresses crosstalk between active and disabled bus sections in multiplexed architectures. |
Applications
| Memory Address/Data Bus Switching | PCI Local Bus Signal Routing |
|---|---|
|
Use Scenario: Isolating DRAM address latches from CPU address bus during refresh cycles while maintaining data bus continuity. IC Role / Device Role / Timing Role: Bidirectional 5-bit switch for A0–A4 and D0–D4 segments, controlled by CPU-generated OE strobes synchronized to memory controller timing. Use Value: Eliminates need for tristate buffers and glue logic; 5-Ω ron ensures <0.5% signal attenuation at 5 V, preserving setup/hold timing margins. |
Use Scenario: Multiplexing shared PCI AD[31:0] lines between two peripheral functions (e.g., Ethernet MAC and USB host controller) on a single slot. IC Role / Device Role / Timing Role: Dual-channel bus switch enabling time-division access to common PCI data/address lines without bus contention. Use Value: 0.35 ns tpd meets PCI Rev 2.2 timing budget for AD line propagation; dual OE allows seamless handoff with <10 ns dead time. |
| I/O Expansion for Microcontrollers | Level-Translating Logic Interface |
|
Use Scenario: Expanding GPIO count of an 8-bit MCU by connecting parallel peripherals (LCD, keypad, ADC) to a shared 10-bit I/O port via bank-select OE signals. IC Role / Device Role / Timing Role: Static bus switch providing non-inverting, low-latency connection between MCU port pins and peripheral data/address lines. Use Value: TTL-compatible inputs accept direct MCU port outputs; 4 pF Ci prevents excessive capacitive loading that would degrade rise/fall times below 10 ns. |
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to a 5-V legacy sensor subsystem requiring bidirectional data exchange without level-shifter ICs. IC Role / Device Role / Timing Role: Passive analog switch leveraging FET channel characteristics to pass signals across voltage domains while maintaining logic polarity. Use Value: Supports rail-to-rail signal swing up to VCC = 5.5 V; 128 mA channel rating handles peak sensor burst currents without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384APWR | Includes power-down control (1OE/2OE active-high with internal pull-downs); higher ICC (10 μA vs. 3 μA); same ron/tpd. | Required where automatic high-Z state on power loss or reset is mandatory (e.g., hot-plug backplanes). | Choose SN74CBTD3384APWR only if active-high OE and guaranteed power-down behavior are design requirements. |
| 74LVC1G3157DP,125 | Single-pole double-throw (SPDT) switch; 1-channel; 6 Ω ron; 5.5 V max VCC; smaller XSON-6 package. | Suitable for point-to-point signal routing (e.g., ADC input mux), not multi-bit bus applications. | Use 74LVC1G3157DP,125 only for single-line switching; SN74CBT3384APWR remains optimal for 10-bit parallel path control. |
Compared with SN74CBTD3384APWR, the SN74CBT3384APWR offers lower quiescent current and simpler OE polarity for fixed-function systems, while the 74LVC1G3157DP,125 lacks multi-bit coordination and cannot replace the 10-bit channel structure required in bus arbitration scenarios.
Availability
SN74CBT3384APWR is available at Aetrix Electronics and suitable for industrial automation controllers, test equipment signal routing, and legacy 5-V embedded systems requiring stable component supply and long-term lifecycle support.
Supply support for SN74CBT3384APWR 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 over 50 years of innovation in high-reliability interface solutions.
The SN74CBT3384APWR belongs to TI's CBT (Crosspoint Bus Transceiver) family, engineered for ultra-low-latency, low-distortion signal routing in high-speed digital systems where timing predictability and signal fidelity are critical.
FAQ
What is the maximum operating voltage for SN74CBT3384APWR?
The SN74CBT3384APWR supports a supply voltage range of 4 V to 5.5 V under recommended conditions, with absolute maximum VCC rated at −0.5 V to 7 V. Exceeding 5.5 V may cause increased leakage or reliability degradation; operation above 5.5 V is outside specification and not supported for long-term use. The SN74CBT3384APWR must be powered within its 4–5.5 V window to guarantee 5-Ω on-resistance and sub-0.35 ns propagation delay.
Does SN74CBT3384APWR support bidirectional signal flow?
Yes, the SN74CBT3384APWR is a true bidirectional FET bus switch: signals pass equally well from port A to port B or B to A when the corresponding OE is low. There is no internal direction control or polarity inversion-its pass-gate topology inherently supports analog and digital signals in either direction, making it ideal for memory data bus sharing and I²C/SMBus signal extension where signal integrity must be preserved in both directions.
Can SN74CBT3384APWR be used in 3.3-V systems?
No-the SN74CBT3384APWR is not specified for 3.3-V operation. Its recommended VCC minimum is 4 V, and TTL-compatible inputs require VIH ≥ 2 V and VIL ≤ 0.8 V relative to VCC-not fixed 3.3-V thresholds. Using it at 3.3 V risks undefined switching behavior, elevated on-resistance (>10 Ω), and failure to meet propagation delay specs. For 3.3-V systems, consider TI's SN74LVC series or other 3.3-V-optimized bus switches instead of SN74CBT3384APWR.
What is the thermal performance of SN74CBT3384APWR in TSSOP-24 package?
The SN74CBT3384APWR in TSSOP-24 (PW) package has a junction-to-ambient thermal resistance (θJA) of 88°C/W, measured per JESD 51-7. At 128 mA channel current and 5.5 V VCC, worst-case power dissipation is ~0.7 W, resulting in ~62°C junction rise above ambient. Adequate PCB copper area (≥1 in² thermal pad) and airflow are recommended for sustained full-load operation. This θJA value is higher than SOIC (DW, 46°C/W) but consistent with TSSOP's thinner profile and smaller footprint.
Is SN74CBT3384APWR RoHS compliant and lead-free?
Yes, the SN74CBT3384APWR is RoHS compliant with lead finish/NiPdAu (NIPDAU) plating and meets JEDEC MSL Level-1 (260°C peak reflow, unlimited floor life). Per TI's packaging addendum, it carries "Yes" for RoHS and "NIPDAU" for lead finish. The device is suitable for lead-free assembly processes and complies with EU Directive 2011/65/EU. No exemptions apply, and the SN74CBT3384APWR contains no intentionally added lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE.
SN74CBT3384APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
SN74CBT3384APWR FAQ
1.How can I place an order for SN74CBT3384APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3384APWR 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 SN74CBT3384APWR reliable?
The price and inventory of SN74CBT3384APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3384APWR is usually 5 days.
3.What payment methods are accepted for SN74CBT3384APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3384APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3384APWR?
SN74CBT3384APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3384APWR 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 SN74CBT3384APWR?
For technical support, including SN74CBT3384APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3384APWR requirements.
6.How does Aetrix verify that SN74CBT3384APWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3384APWR 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 SN74CBT3384APWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3384APWR?
All SN74CBT3384APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3384APWR, 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 SN74CBT3384APWR part is unused and in its original packaging.
Return procedure for SN74CBT3384APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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