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Texas Instruments SN74CBTS3306D
- Part No.:
- SN74CBTS3306D
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTS3306D.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:616
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Product details
Overview
SN74CBTS3306D from Texas Instruments is a dual 1-bit bus switch IC with independent TTL-compatible enable control, 5-Ω on-state resistance, Schottky-clamped I/Os for undershoot protection, and operation across −40°C to 85°C - used in high-speed data path isolation for PCI, memory expansion, and hot-swap interface circuits.
For engineers reviewing the SN74CBTS3306D datasheet, SN74CBTS3306D pinout, SN74CBTS3306D application, or SN74CBTS3306D equivalent, key selection criteria include on-resistance matching, OE-controlled bidirectional switching latency, thermal performance in SOIC-D package, and compatibility with 3.3 V/5 V mixed-signaling systems.
Technical Context
This device implements two independent single-pole single-throw (SPST) analog switches controlled by separate OE inputs, each enabling bidirectional signal flow between A and B ports when low. The internal architecture uses NMOS pass transistors with integrated Schottky clamps on all I/O pins to suppress negative undershoot below −1.2 V.
Switching is fully bidirectional with no direction pin; propagation delay is ≤0.35 ns at VCC = 4 V and CL = 50 pF, while enable/disable times are ≤5.6 ns (ten) and ≤4.6 ns (tdis). It operates within 4 V to 5.5 V supply range and supports TTL-level control inputs (VIH ≥ 2 V, VIL ≤ 0.8 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, 30 mA - ensures minimal voltage drop and signal integrity in 3.3 V/5 V digital buses. |
| Propagation delay (tpd) | 0.35 ns max at VCC = 4 V, CL = 50 pF - enables sub-nanosecond timing-critical signal routing without added skew. |
| Enable time (ten) | 5.6 ns max at VCC = 4 V - supports fast dynamic bus partitioning in hot-plug or power-gating applications. |
| Supply voltage range | 4 V to 5.5 V - compatible with both 3.3 V logic systems (with margin) and legacy 5 V designs. |
| Input clamp voltage (VIK) | −1.2 V at II = −18 mA - protects downstream circuitry from −2 V transient undershoot events. |
| Off-state capacitance (Cio(OFF)) | 6 pF at VO = 3 V or 0 V - minimizes capacitive loading and crosstalk during disabled state. |
| Operating temperature | −40°C to 85°C - qualified for industrial-grade embedded control and communications equipment. |
Pinout & Package
SN74CBTS3306D is housed in an 8-pin SOIC (D) package with 1.27 mm lead pitch, 3.94 mm body width, and 1.75 mm maximum height - optimized for automated assembly and thermal dissipation (θJA = 97°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Enable input for Channel 1 | Active-low control: drives 1A ↔ 1B path when low; high-impedance isolation when high. |
| 2 (1A) | Channel 1 input/output A-side terminal | Bidirectional port - connects to upstream data source or sink without direction constraint. |
| 3 (1B) | Channel 1 input/output B-side terminal | Bidirectional port - connects to downstream bus segment or peripheral interface. |
| 4 (GND) | Ground reference | Primary return path for switch current and logic control; must be low-inductance connection. |
| 5 (2OE) | Enable input for Channel 2 | Independent active-low control for second switch; enables concurrent or staggered bus partitioning. |
| 6 (2A) | Channel 2 input/output A-side terminal | Second bidirectional data path - electrically isolated from Channel 1 except via shared VCC/GND. |
| 7 (2B) | Channel 2 input/output B-side terminal | Second bidirectional data path - supports independent routing of parallel signals or address/data lanes. |
| 8 (VCC) | Positive supply | Power rail for internal switch bias and level translation; bypass capacitor required per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Minimizes insertion loss and maintains signal edge fidelity in high-speed parallel buses up to 100 MHz. |
| TTL-compatible control inputs | Accepts standard 3.3 V or 5 V logic levels without external level shifters - simplifies integration with microcontrollers and FPGAs. |
| Schottky diode clamping on all I/Os | Clamps negative transients to −1.2 V, protecting connected logic from ESD-induced undershoot in hot-swap environments. |
| Independent dual-channel enable | Allows selective isolation of two data paths (e.g., address vs. data lines) without cross-talk or shared timing constraints. |
| Sub-1 ns propagation delay | Preserves timing margins in synchronous interfaces such as PCI-X add-in cards and memory-mapped peripherals. |
Applications
| PCI Bus Isolation | Memory Expansion Interface |
|---|---|
|
Use Scenario: Isolating legacy PCI add-in card signals from motherboard during hot insertion/removal to prevent bus contention. IC Role / Device Role / Timing Role: Dual-channel bidirectional bus switch providing real-time signal path enable/disable under system controller OE command. Use Value: Prevents data corruption and power surges by decoupling unpowered peripherals before insertion, enabled by <5.6 ns ten and robust −1.2 V undershoot clamping. |
Use Scenario: Extending DRAM address/data bus between SoC and additional memory modules in industrial controllers. IC Role / Device Role / Timing Role: Low-resistance, low-capacitance signal bridge that preserves setup/hold timing across extended trace lengths. Use Value: Maintains signal integrity with 5 Ω ron and 6 pF Cio(OFF), reducing reflection-induced jitter and supporting >83 MHz clock domains. |
| Hot-Swap Backplane Interface | FPGA I/O Expansion Hub |
|
Use Scenario: Managing signal routing between field-replaceable modules and backplane in telecom line cards. IC Role / Device Role / Timing Role: Independent channel switching allows staged power-up sequencing and fault containment per module slot. Use Value: Enables safe live insertion via OE-controlled isolation, backed by −40°C to 85°C qualification and 97°C/W thermal resistance in SOIC-D. |
Use Scenario: Multiplexing FPGA GPIO banks to multiple peripheral interfaces (UART, SPI, I²C) where pin count is constrained. IC Role / Device Role / Timing Role: Bidirectional analog switch extending I/O flexibility without dedicated transceivers or level translators. Use Value: Delivers 0.35 ns tpd and TTL-compatible control - eliminating need for external buffers while preserving FPGA timing closure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3306D | Same pinout and function but lacks Schottky clamps on I/Os; higher VIK (−0.7 V); lower ESD robustness. | Not suitable for hot-swap or noisy industrial environments requiring undershoot suppression. | Select SN74CBTS3306D when Schottky clamping and −1.2 V VIK are required for transient immunity. |
| 74LVC1G3157GW | Single-channel, smaller XSON-6 package; 6 Ω ron; 3.3 V only; no integrated clamps; 3 ns tpd. | Limited to low-pin-count, space-constrained designs with single-lane isolation needs. | Choose 74LVC1G3157GW only for compact 3.3 V-only applications where dual-channel operation is unnecessary. |
Compared with SN74CBT3306D and 74LVC1G3157GW, SN74CBTS3306D uniquely delivers dual-channel isolation with Schottky undershoot protection, 5 Ω ron, and full 4–5.5 V operation - making it the only option qualified for industrial hot-swap and mixed-voltage PCI-style bus architectures.
Availability
SN74CBTS3306D is available at Aetrix Electronics and suitable for PCI bus isolation, memory expansion interfaces, and hot-swap backplane designs requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74CBTS3306D 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 SN74CBTS3306D belongs to TI's CBTS (CrossBar Transistor Switch) family - engineered specifically for low-latency, low-resistance bidirectional signal routing in high-speed digital systems with stringent noise and timing requirements.
FAQ
What is the maximum continuous current rating for each switch channel in SN74CBTS3306D?
The SN74CBTS3306D supports a continuous channel current of 128 mA per switch, verified per absolute maximum ratings. This rating applies under recommended operating conditions (VCC = 4–5.5 V, TA = −40°C to 85°C) and assumes proper PCB thermal design. Exceeding this current may degrade on-resistance stability or accelerate electromigration in bond wires. The SN74CBTS3306D datasheet specifies this limit in Section 5.1 under "Absolute Maximum Ratings".
Does SN74CBTS3306D support 3.3 V-only operation, or is 5 V mandatory?
SN74CBTS3306D operates across a supply range of 4 V to 5.5 V, so 3.3 V is not supported. Its minimum VCC is 4 V, and recommended operating conditions specify 4 V minimum - meaning it cannot reliably function at 3.3 V logic rails. For 3.3 V systems, designers must use level-shifting or select alternatives like SN74LVC1G3157. The SN74CBTS3306D electrical characteristics table confirms VIH/VIL thresholds assume VCC ≥ 4 V.
How does the Schottky clamping in SN74CBTS3306D improve system reliability?
The Schottky diodes on all I/O pins of SN74CBTS3306D clamp negative transients to −1.2 V (VIK), preventing undershoot from damaging downstream CMOS inputs during hot-swap events or cable disconnects. This feature directly enhances system reliability in industrial backplanes and PCI slots where uncontrolled ground bounce or inductive kick occurs. The SN74CBTS3306D datasheet specifies VIK = −1.2 V at −18 mA in Section 6.5.
Is SN74CBTS3306D pin-compatible with SN74CBT3306D?
Yes, SN74CBTS3306D is pin-compatible with SN74CBT3306D - both share identical SOIC-8 (D) package, pinout, and functional mapping. However, SN74CBTS3306D adds Schottky clamps and improves VIK to −1.2 V versus −0.7 V in SN74CBT3306D. No PCB changes are required for substitution, but system-level undershoot immunity improves with SN74CBTS3306D.
What is the thermal resistance (θJA) of SN74CBTS3306D in its SOIC-D package?
The junction-to-ambient thermal resistance (θJA) of SN74CBTS3306D in the SOIC-D package is 97°C/W, measured per JESD 51-7 under standard JEDEC test board conditions. This value assumes a 2-layer PCB with 1 in² copper pour per side and is critical for calculating maximum power dissipation (Pmax = (TJmax − TA)/θJA). The SN74CBTS3306D datasheet lists this in Section 5.2 under "Absolute Maximum Ratings".
SN74CBTS3306D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTS
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 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:
- 8-SOIC
SN74CBTS3306D FAQ
1.How can I place an order for SN74CBTS3306D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTS3306D 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 SN74CBTS3306D reliable?
The price and inventory of SN74CBTS3306D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTS3306D is usually 5 days.
3.What payment methods are accepted for SN74CBTS3306D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTS3306D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBTS3306D?
SN74CBTS3306D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTS3306D 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 SN74CBTS3306D?
For technical support, including SN74CBTS3306D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTS3306D requirements.
6.How does Aetrix verify that SN74CBTS3306D is sourced from the original manufacturer or authorized distributors?
All SN74CBTS3306D 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 SN74CBTS3306D meets industry standards.
7.What is the process for return or replacement of SN74CBTS3306D?
All SN74CBTS3306D units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTS3306D, 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 SN74CBTS3306D part is unused and in its original packaging.
Return procedure for SN74CBTS3306D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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