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Texas Instruments SN74CBTS3384PW
- Part No.:
- SN74CBTS3384PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTS3384PW.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,030
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Product details
Overview
SN74CBTS3384PW from Texas Instruments is a 10-bit FET bus switch with Schottky diode clamping, designed for high-speed TTL-compatible signal routing in memory and data-path applications. It features 5-Ω on-state resistance, 0.25 ns propagation delay at 5 V, and dual independent 5-bit switches controlled by separate OE inputs. Used in address/data bus isolation in industrial controllers and FPGA I/O expansion.
For engineers reviewing the SN74CBTS3384PW datasheet, SN74CBTS3384PW pinout, SN74CBTS3384PW application, or SN74CBTS3384PW equivalent, key selection criteria include on-resistance matching, undershoot protection via integrated Schottky clamps, dual-OE control flexibility, and TSSOP-24 thermal performance (θJA = 88°C/W).
Technical Context
The SN74CBTS3384PW implements two independent 5-bit FET-based analog switches using NMOS pass transistors with back-to-back Schottky diodes on all A/B I/Os to clamp negative undershoot down to –0.6 V. Each switch operates bidirectionally with no direction pin required.
Control logic uses active-low OE inputs: low enables connection between port A and port B; high places both ports in high-impedance state. The device requires no external biasing and supports rail-to-rail signal switching across 4 V to 5.5 V supply range.
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 distortion under 64 mA load. |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V, CL = 50 pF - enables sub-nanosecond timing-critical bus gating in high-speed digital systems. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed-voltage 4.5–5.5 V system rails. |
| Input clamp voltage (VIK) | –0.6 V at II = 18 mA - protects downstream logic from negative transients via integrated Schottky diodes. |
| Off-state capacitance (Cio(OFF)) | 6.5 pF at VO = 3 V - minimizes capacitive loading when switch is disabled, preserving signal integrity on shared buses. |
| Operating temperature | –40°C to +85°C - qualified for industrial ambient environments without derating. |
| Package thermal resistance (θJA) | 88°C/W for TSSOP-24 - defines maximum power dissipation limit (≈140 mW) under natural convection. |
Pinout & Package
TSSOP-24 package (PW), 7.8 mm × 4.4 mm × 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 24 | GND / VCC / OE / OE | Pins 1 (1OE), 12 (GND), 13 (VCC), 24 (2OE) provide dual enable control and power distribution - critical for independent bus segment isolation. |
| 2–6, 14–18 | Port A / Port B I/O | Pins 2–6 = 1A1–1A5; pins 14–18 = 2A1–2A5 - bidirectional signal paths with Schottky clamps on each line. |
| 7–11, 19–23 | Port B / Port A I/O | Pins 7–11 = 1B1–1B5; pins 19–23 = 2B1–2B5 - mirror A-side connections; full 10-bit crosspoint routing capability. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 5-Ω FET switch | Enables low-loss, polarity-agnostic signal routing between microcontroller GPIOs and peripheral buses without direction control logic. |
| Integrated Schottky clamping | Clamps I/O undershoot to –0.6 V, eliminating need for external TVS diodes in noisy industrial bus environments. |
| Dual independent OE control | Allows selective isolation of two 5-bit segments (e.g., address vs. data lines) with zero inter-segment crosstalk when one is disabled. |
| TTL-compatible input thresholds | VIL ≤ 0.8 V and VIH ≥ 2 V ensure reliable interfacing with legacy 5-V CMOS/TTL logic without level shifters. |
| Low 6.5-pF off-capacitance | Maintains high-frequency signal fidelity (>100 MHz) on adjacent traces during inactive states, reducing bus coupling noise. |
Applications
| Memory Bus Isolation | FPGA I/O Expansion |
|---|---|
Use Scenario: Isolating DRAM address/data lines from CPU during DMA transfers to prevent contention and signal corruption. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling/disabling physical layer connectivity with sub-ns timing control. Use Value: Eliminates need for discrete MOSFET arrays and external clamping diodes while maintaining <0.3 ns skew across all 10 bits. | Use Scenario: Extending limited FPGA I/O banks to drive multiple peripheral modules (ADCs, DACs, sensors) sharing common data lanes. IC Role / Device Role / Timing Role: Signal multiplexer with independent enable control per 5-bit group for time-multiplexed peripheral access. Use Value: Reduces PCB layer count by consolidating routing through single TSSOP-24 instead of multiple discrete switches. |
| Industrial PLC Backplane | Legacy Microcontroller Interface |
Use Scenario: Routing sensor data streams across modular I/O slots in programmable logic controllers with EMI-prone cabinet environments. IC Role / Device Role / Timing Role: ESD-robust bus gate providing undershoot suppression and high-Z isolation between hot-swappable modules. Use Value: Integrated Schottky clamps meet IEC 61000-4-2 Level 3 (±6 kV contact) transient immunity without added components. | Use Scenario: Interfacing 8051-family microcontrollers with 5-V peripherals while managing bus contention during reset or sleep modes. IC Role / Device Role / Timing Role: Controlled impedance buffer isolating MCU address latch outputs from shared memory-mapped peripherals. Use Value: 5-Ω ron ensures <50 mV voltage drop at 10 mA sink/source, preserving TTL logic margins across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3384PW | Same pinout, identical ron and tpd, but lacks Schottky clamps on I/Os. | Requires external clamping diodes in noisy environments; unsuitable for direct replacement where undershoot protection is mandatory. | Select only if system-level transient protection is already implemented externally and cost reduction is prioritized. |
| 74LVC1G3157GW | Single-pole double-throw (SPDT) analog switch, 5-V tolerant, 6 Ω ron, but only 1 channel and no dual-OE support. | Cannot replace 10-bit dual-bus functionality; suitable only for point-to-point signal routing, not bus-wide gating. | Use for isolated signal path switching where density and multi-bit coordination are not required. |
Compared with SN74CBTS3384PW, SN74CBT3384PW omits integrated Schottky clamps-increasing BOM count and board area-while 74LVC1G3157GW provides only 1/10 the channel count and no parallel bus control, making neither a drop-in substitute for full 10-bit dual-OE operation.
Availability
SN74CBTS3384PW is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion, memory bus isolation, and legacy microcontroller interface applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74CBTS3384PW 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 and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The SN74CBTS3384PW belongs to TI's CBTS (CMOS Bus Transceiver Switch) family, engineered specifically for high-speed, low-distortion bus gating in 5-V systems where signal integrity, undershoot resilience, and compact packaging are critical.
FAQ
What is the maximum continuous current rating per channel for the SN74CBTS3384PW?
The SN74CBTS3384PW supports up to 128 mA continuous channel current per switch path, as specified in its absolute maximum ratings. This rating applies under recommended operating conditions (VCC = 4–5.5 V, TA = –40°C to +85°C) and ensures safe operation without thermal runaway when used within its 5-Ω on-resistance envelope. Exceeding this current may degrade ron stability or accelerate wear-out mechanisms.
Does the SN74CBTS3384PW require external pull-up or pull-down resistors on its OE inputs?
No, the SN74CBTS3384PW does not require external pull-up or pull-down resistors on its OE inputs. Its TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) allow direct connection to standard 5-V logic outputs. However, TI recommends tying unused OE inputs to VCC or GND to prevent floating states that could cause unintended switching or increased ICC.
Can the SN74CBTS3384PW operate reliably at 3.3 V supply voltage?
No, the SN74CBTS3384PW is not characterized or guaranteed for operation at 3.3 V. Its recommended operating VCC range is strictly 4 V to 5.5 V, and electrical specifications-including 5-Ω ron, 0.25 ns tpd, and –0.6 V VIK-are validated only within that range. At 3.3 V, the device may fail to turn on fully or exhibit degraded noise margins and timing performance.
How does the Schottky diode clamping in the SN74CBTS3384PW improve system robustness?
The Schottky diode clamping in the SN74CBTS3384PW limits I/O undershoot to –0.6 V at 18 mA, preventing negative voltage excursions from damaging downstream CMOS inputs or violating absolute maximum ratings. This eliminates the need for discrete clamping diodes in designs exposed to inductive kickback or ESD events, directly improving board-level reliability in industrial motor-control and PLC backplane applications where SN74CBTS3384PW is commonly deployed.
Is the SN74CBTS3384PW pin-compatible with other packages in the same family, such as SN74CBTS3384PWR?
Yes, the SN74CBTS3384PW is mechanically and electrically pin-compatible with SN74CBTS3384PWR-the only difference is packaging format (tube vs. tape-and-reel). Both use identical TSSOP-24 (PW) footprint, pinout, marking (CR384), and thermal characteristics (θJA = 88°C/W). No PCB layout changes are needed when migrating between SN74CBTS3384PW and SN74CBTS3384PWR for production scaling or prototype assembly.
SN74CBTS3384PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTS
- 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
SN74CBTS3384PW FAQ
1.How can I place an order for SN74CBTS3384PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTS3384PW 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 SN74CBTS3384PW reliable?
The price and inventory of SN74CBTS3384PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTS3384PW is usually 5 days.
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Once your SN74CBTS3384PW 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 SN74CBTS3384PW?
For technical support, including SN74CBTS3384PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTS3384PW requirements.
6.How does Aetrix verify that SN74CBTS3384PW is sourced from the original manufacturer or authorized distributors?
All SN74CBTS3384PW 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 SN74CBTS3384PW meets industry standards.
7.What is the process for return or replacement of SN74CBTS3384PW?
All SN74CBTS3384PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTS3384PW, 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 SN74CBTS3384PW part is unused and in its original packaging.
Return procedure for SN74CBTS3384PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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