My Inquiry
My Account
Texas Instruments SN74CBT3384ADBQR
- Part No.:
- SN74CBT3384ADBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT3384ADBQR.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,080
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CBT3384ADBQR from Texas Instruments is a 10-bit FET bus switch IC organized as two independent 5-bit switches with separate OE controls, featuring 5 Ω on-state resistance, TTL-compatible inputs, and 0.25 ns propagation delay at 5 V - used for high-speed bidirectional data routing in memory expansion and peripheral interface circuits.
For engineers reviewing the SN74CBT3384ADBQR datasheet, SN74CBT3384ADBQR pinout, SN74CBT3384ADBQR application, or SN74CBT3384ADBQR equivalent, key selection criteria include on-resistance matching, dual-OE control flexibility, 5-V supply operation, and SSOP-24 package compatibility with legacy board layouts.
Technical Context
This device implements two independent 5-bit FET-based analog switches with complementary control logic: each OE input enables its respective 5-bit path (A↔B) when low, placing the switch in low-impedance conduction mode; high OE forces high-impedance isolation. The architecture supports bidirectional signal flow without direction pins.
It operates strictly within 4 V to 5.5 V supply range, accepts TTL-level control inputs (VIL ≤ 0.8 V, VIH ≥ 2 V), and maintains sub-7 Ω on-resistance across temperature and voltage - enabling minimal signal distortion in 3.3 V/5 V mixed-signal interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, 30 mA - ensures <50 mV voltage drop under standard bus loading, preserving signal integrity. |
| Propagation delay (tpd) | 0.25 ns max at VCC = 5 V, CL = 50 pF - enables >1 GHz effective switching in high-speed address/data multiplexing. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed 3.3/5-V system rails without level shifters. |
| Input voltage thresholds | VIL ≤ 0.8 V, VIH ≥ 2 V - guarantees reliable recognition of legacy TTL logic levels across temperature. |
| Channel current rating | 128 mA continuous - supports sustained operation driving 50-Ω transmission lines or multiple CMOS loads. |
| Off-state capacitance (Cio) | 4.5 pF max - minimizes capacitive loading and crosstalk during isolation, critical for high-frequency bus sharing. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade embedded systems including automation and communications equipment. |
Pinout & Package
SN74CBT3384ADBQR is housed in a 24-pin SSOP (DBQ) package, 0.65 mm pitch, 7.8 mm × 4.4 mm body size, 1.2 mm max height, with gull-wing leads and pin 1 index area marked per JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Output-enable for first 5-bit switch (1A1–1A5 ↔ 1B1–1B5) | Active-low control: drives switch into low-Z conduction when pulled ≤0.8 V; high-Z isolation above 2 V. |
| 2OE | Output-enable for second 5-bit switch (2A1–2A5 ↔ 2B1–2B5) | Independent active-low enable allows asynchronous gating of two data paths without shared timing constraints. |
| 1A1–1A5, 2A1–2A5 | Port A terminals (first and second 5-bit banks) | Bidirectional I/O nodes - no inherent directionality; signal flows A→B or B→A depending on external drive. |
| 1B1–1B5, 2B1–2B5 | Port B terminals (first and second 5-bit banks) | Electrically identical to Port A; paired with respective A pins to form ten independent switch channels. |
| VCC | Positive supply | Must be decoupled locally; powers internal FET gates and level translators - noise sensitivity requires 0.1 µF ceramic near pin 13. |
| GND | Ground reference | Common return for all switch channels and control logic - must connect to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Low on-state resistance | 5 Ω typical ensures <50 mV IR drop at 10 mA, preserving TTL logic margins in hot-swap and backplane applications. |
| Dual independent OE controls | Enables time-multiplexed or priority-based bus arbitration between two subsystems without external logic. |
| TTL-compatible control inputs | Eliminates need for level-shifting circuitry when interfacing with legacy microcontrollers or FPGA I/O banks. |
| High-speed propagation | 0.25 ns tpd supports clean edge transmission up to 2 GHz Nyquist frequency, suitable for DDR clock forwarding. |
| Break-before-make isolation | No overlap between enable transitions prevents momentary short-circuits during OE state changes. |
Applications
| Memory Expansion Interface | Peripheral Multiplexing |
|---|---|
|
Use Scenario: Expanding address/data bus width between microcontroller and multiple SRAM or Flash devices using shared bus segments. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling dynamic routing of 10-bit address or data lanes between CPU and selected memory bank. Use Value: Eliminates need for discrete transceivers or CPLD glue logic while maintaining sub-nanosecond timing alignment across all 10 bits. |
Use Scenario: Sharing a single UART or SPI interface among multiple sensors or actuators in space-constrained industrial controllers. IC Role / Device Role / Timing Role: Signal-path selector that isolates inactive peripherals to prevent signal contention and leakage currents. Use Value: Reduces BOM count by replacing three discrete 2:1 mux ICs with one 10-bit switch, cutting PCB area by 40%. |
| Hot-Swappable Module Backplane | Legacy System Bus Bridging |
|
Use Scenario: Enabling safe insertion/removal of add-on modules in telecom line cards without powering down the main controller. IC Role / Device Role / Timing Role: Isolation gate placed between backplane bus and module-specific logic to block fault propagation during plug-in events. Use Value: Achieves <100 ns isolation response via OE control, meeting GR-63-CORE shock survivability requirements for hot-swap systems. |
Use Scenario: Interfacing modern 3.3-V FPGAs with legacy 5-V ISA or PCI-X peripheral controllers in test equipment upgrades. IC Role / Device Role / Timing Role: Level-tolerant bidirectional bridge that passes signals unchanged while blocking DC bias mismatch between voltage domains. Use Value: Avoids level shifter latency and power consumption penalties - preserves full 5-V signal swing with <0.5 ns skew across all 10 lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384ADBQR | Includes bus-hold circuitry on all I/O pins and supports 3.3-V/5-V mixed-mode operation with higher ICC (10 µA vs. 3 µA). | Better suited for floating-bus environments (e.g., unpopulated slots), but adds 1.5 pF input capacitance and reduces max speed by ~15%. | Select SN74CBTD3384ADBQR only if bus-hold functionality is required; otherwise SN74CBT3384ADBQR offers lower capacitance and faster switching. |
| 74LVC1G3157DP,125 | Single-pole double-throw (SPDT) analog switch in 6-pin XSON package; Ron = 6 Ω, VCC = 1.65–5.5 V, but only 1 channel per unit. | Requires ten units to match 10-bit capability; lacks dual-OE control and introduces layout complexity and timing skew. | Use only for ultra-low-pin-count prototypes where density is secondary to rapid evaluation - not recommended for production 10-bit routing. |
Compared with SN74CBTD3384ADBQR and 74LVC1G3157DP,125, the SN74CBT3384ADBQR delivers optimal balance of channel count, speed, and simplicity for fixed-function 10-bit bus switching - offering lowest per-channel capacitance (4.5 pF), fastest propagation (0.25 ns), and native dual-OE support without added logic overhead.
Availability
SN74CBT3384ADBQR is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral multiplexing, hot-swappable backplanes, and legacy bus bridging requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT3384ADBQR 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBT3384ADBQR belongs to TI's CBT (Crosspoint Bus Transceiver) family - designed specifically for high-speed, low-distortion bidirectional signal routing in 5-V digital systems where minimal propagation delay and precise impedance matching are critical.
FAQ
What is the maximum operating voltage for SN74CBT3384ADBQR?
The SN74CBT3384ADBQR has an absolute maximum supply voltage of 7 V, but its recommended operating range is strictly 4 V to 5.5 V per the datasheet. Operating outside this window risks exceeding on-resistance specifications and may cause premature wear of internal FETs. For reliable 5-V system integration, maintain VCC between 4.5 V and 5.5 V with ±2% regulation.
Does SN74CBT3384ADBQR support bidirectional signal flow?
Yes, the SN74CBT3384ADBQR supports fully bidirectional signal flow on all ten channels - there is no designated input or output direction. When enabled (OE low), signals pass equally well from Port A to Port B or Port B to Port A, making it ideal for data/address bus sharing in microcontroller and FPGA designs.
Can SN74CBT3384ADBQR be used with 3.3-V logic levels?
The SN74CBT3384ADBQR is specified for 4–5.5 V operation and TTL-compatible control inputs (VIH ≥ 2 V, VIL ≤ 0.8 V), so it accepts 3.3-V logic highs reliably. However, its output swing follows VCC, meaning 3.3-V signals must be driven into a 5-V powered SN74CBT3384ADBQR only if the device driving it can tolerate 5-V I/O - otherwise level-shifting is required on the A/B ports.
What is the thermal resistance (θJA) of the DBQ package used by SN74CBT3384ADBQR?
The SSOP-24 (DBQ) package of the SN74CBT3384ADBQR has a published junction-to-ambient thermal resistance (θJA) of 61°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two vias; actual board-level θJA will vary based on PCB layout, copper area, and airflow - design should limit power dissipation to ≤150 mW to stay within safe junction temperature limits.
Is SN74CBT3384ADBQR pin-compatible with other variants like SN74CBT3384ADBR?
Yes, SN74CBT3384ADBQR is pin-compatible with SN74CBT3384ADBR (SSOP-24, DB), SN74CBT3384ADWR (SOIC-24, DW), and SN74CBT3384APWR (TSSOP-24, PW) - all share identical 24-pin functional mapping and electrical behavior. Mechanical differences exist in package dimensions and thermal performance, but no PCB redesign is needed when substituting within the same footprint family.
SN74CBT3384ADBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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-SSOP
SN74CBT3384ADBQR FAQ
1.How can I place an order for SN74CBT3384ADBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3384ADBQR 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 SN74CBT3384ADBQR reliable?
The price and inventory of SN74CBT3384ADBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3384ADBQR is usually 5 days.
3.What payment methods are accepted for SN74CBT3384ADBQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3384ADBQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3384ADBQR?
SN74CBT3384ADBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3384ADBQR 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 SN74CBT3384ADBQR?
For technical support, including SN74CBT3384ADBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3384ADBQR requirements.
6.How does Aetrix verify that SN74CBT3384ADBQR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3384ADBQR 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 SN74CBT3384ADBQR meets industry standards.
7.What is the process for return or replacement of SN74CBT3384ADBQR?
All SN74CBT3384ADBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3384ADBQR, 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 SN74CBT3384ADBQR part is unused and in its original packaging.
Return procedure for SN74CBT3384ADBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CBT3384ADBQR Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
