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Texas Instruments SN74CBTS3306PWR
- Part No.:
- SN74CBTS3306PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTS3306PWR.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74CBTS3306PWR from Texas Instruments is a dual 1-bit bus switch IC with independent TTL-compatible enable control, 5-Ω on-state resistance, and Schottky-clamped I/Os for undershoot protection - used in high-speed data path isolation between microcontrollers and peripheral buses in industrial control systems.
For engineers reviewing the SN74CBTS3306PWR datasheet, SN74CBTS3306PWR pinout, SN74CBTS3306PWR application, or SN74CBTS3306PWR equivalent, key selection criteria include on-resistance matching, OE-controlled bidirectional switching, TSSOP-8 thermal performance (149°C/W), and compatibility with 4–5.5 V supply rails in space-constrained PCB layouts.
Technical Context
This device implements two independent single-pole single-throw (SPST) analog switches with complementary metal-oxide-semiconductor (CMOS) control logic. Each switch connects its A and B port only when the corresponding OE input is low, enabling precise per-line bus gating without signal inversion or level translation.
It features Schottky diodes on all I/O pins to clamp negative undershoot transients down to −1.2 V, supports 128 mA continuous channel current, and maintains sub-1 ns propagation delay (tpd = 0.25 ns at VCC = 5 V) under 50 pF load - critical for maintaining signal integrity in DDR, PCI, and legacy parallel bus interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, ensuring minimal voltage drop (<320 mV at 64 mA) and low power loss in signal routing paths. |
| Propagation delay (tpd) | 0.25 ns max at VCC = 5 V, CL = 50 pF - enables use in >1 GHz data rate applications without timing skew. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5 V logic domains and tolerant of rail droop during transient loads. |
| Input voltage range (VI) | −0.5 V to 7 V - accommodates overshoot/undershoot events while maintaining latch-up immunity. |
| Enable disable time (tdis) | 4.3 ns max at VCC = 5 V - allows rapid bus reconfiguration in dynamic memory or FPGA configuration interfaces. |
| Thermal impedance (θJA) | 149°C/W for TSSOP-8 package - defines maximum power dissipation (≤36 mW at 85°C ambient) before thermal derating. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade embedded systems including programmable logic controllers and motor drives. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, moisture sensitivity level 1, RoHS-compliant NIPDAU finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply rail | Must be decoupled locally with ≥0.1 µF ceramic capacitor; powers internal switch FETs and control logic. |
| 2 (2OE) | Channel 2 output-enable input | Active-low control: drives 2A↔2B path when low; high-impedance state when high (no current flow). |
| 3 (2B) | Channel 2 bidirectional I/O terminal | Connects to peripheral-side bus segment; Schottky clamping protects against −1.2 V undershoot. |
| 4 (2A) | Channel 2 bidirectional I/O terminal | Connects to controller-side bus segment; electrically identical to 2B with matched on-resistance. |
| 5 (1OE) | Channel 1 output-enable input | Independent active-low enable for 1A↔1B path; allows asymmetric bus gating across two data lines. |
| 6 (1A) | Channel 1 bidirectional I/O terminal | Controller-side interface point; supports 128 mA continuous current without thermal shutdown. |
| 7 (1B) | Channel 1 bidirectional I/O terminal | Peripheral-side interface point; symmetric electrical characteristics to 1A ensure balanced signal routing. |
| 8 (GND) | Digital ground reference | Must connect to low-impedance system ground plane; separates noise from VCC return path to minimize crosstalk. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Minimizes insertion loss and signal attenuation in high-frequency digital paths up to 500 MHz. |
| TTL-compatible control inputs | VIH = 2 V / VIL = 0.8 V thresholds allow direct interfacing with legacy 5 V microcontrollers without level shifters. |
| Integrated Schottky clamping diodes | Clamps I/O undershoot to −1.2 V, eliminating need for external TVS devices in noisy industrial environments. |
| Bidirectional signal routing | No direction pin required - data flows equally well from A-to-B or B-to-A depending on system topology. |
| Independent channel enables | Per-line gating enables selective isolation of individual bus signals (e.g., address vs. data lines) in multi-function peripherals. |
Applications
| PCI Bus Isolation | FPGA Configuration Interface |
|---|---|
|
Use Scenario: Isolating legacy PCI add-in cards from host bridge logic during hot-plug detection or reset sequencing. IC Role / Device Role / Timing Role: Dual-channel bus switch providing per-signal gating for AD[31:0] and C/BE#[3:0] lines with sub-nanosecond timing alignment. Use Value: Prevents back-driving and contention during card insertion/removal while preserving signal edge rates via 5-Ω Ron. |
Use Scenario: Enabling/disabling configuration data lanes between FPGA JTAG TDI/TDO and external PROM or flash memory. IC Role / Device Role / Timing Role: Bidirectional switch isolating configuration bus during FPGA reconfiguration to avoid data corruption. Use Value: Eliminates need for discrete MOSFETs or complex logic; OE-controlled disconnect ensures zero static current leakage. |
| Microcontroller Peripheral Multiplexing | Industrial Sensor Data Hub |
|
Use Scenario: Sharing limited GPIO pins between UART, SPI, and I²C peripherals on resource-constrained MCU designs. IC Role / Device Role / Timing Role: Signal path selector routing shared pins to different peripheral subsystems based on software-configured OE states. Use Value: Reduces PCB layer count by avoiding dedicated routing layers; 0.25 ns tpd prevents timing violations in 25 MHz SPI transfers. |
Use Scenario: Aggregating analog and digital sensor outputs (e.g., thermocouple ADC, RS-485 transceivers) onto a common backplane bus. IC Role / Device Role / Timing Role: Fault-isolation switch preventing fault propagation from one sensor node to others during overvoltage or ESD events. Use Value: Schottky clamping limits transient-induced damage; independent OE control allows per-node diagnostics without system-wide reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3306PWR | Same functional block, identical pinout, but lacks Schottky clamping diodes on I/Os. | Requires external undershoot protection in electrically noisy environments. | Select when cost sensitivity outweighs need for integrated transient suppression. |
| 74LVC1G3157DP,125 | Single-channel, 3.3 V only (1.65–5.5 V), higher Ron (6.5 Ω typ), smaller X2SON-6 package. | Better suited for low-pin-count, low-power portable applications rather than industrial dual-bus isolation. | Choose for space-constrained designs where only one signal line requires switching and 3.3 V operation suffices. |
Compared with SN74CBT3306PWR and 74LVC1G3157DP,125, the SN74CBTS3306PWR uniquely combines dual-channel operation, 5 V tolerance, integrated Schottky clamping, and TSSOP-8 manufacturability - making it optimal for industrial bus isolation where reliability and layout simplicity are prioritized over minimal footprint.
Availability
SN74CBTS3306PWR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded computing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74CBTS3306PWR 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 experience in high-reliability industrial and automotive components.
The SN74CBTS3306PWR belongs to TI's CBTS (Crosspoint Bus Switch) family, engineered specifically for low-latency, bidirectional signal routing in legacy and mixed-voltage digital systems where signal integrity and robustness against electrical transients are critical.
FAQ
What is the maximum continuous current rating for each switch channel in the SN74CBTS3306PWR?
The SN74CBTS3306PWR supports up to 128 mA continuous channel current per switch path. This rating is defined under absolute maximum conditions and assumes proper PCB thermal design - including adequate copper pour on VCC and GND pads - to maintain junction temperature within safe limits during sustained operation.
Does the SN74CBTS3306PWR require external pull-up or pull-down resistors on its OE inputs?
No, the SN74CBTS3306PWR does not require external biasing on its OE inputs. Its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 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 undefined switch behavior.
Can the SN74CBTS3306PWR operate reliably at 3.3 V supply voltage?
The SN74CBTS3306PWR is specified for 4 V to 5.5 V operation per its recommended conditions; operation at 3.3 V is outside datasheet specifications. At 3.3 V, on-resistance increases significantly (>10 Ω), propagation delay degrades, and input threshold margins shrink - risking unreliable switching. Use SN74LVC1G3157 or similar 3.3 V-optimized switches instead.
How does the Schottky clamping in the SN74CBTS3306PWR improve system-level ESD robustness?
The integrated Schottky diodes on all I/O pins of the SN74CBTS3306PWR clamp negative transients to −1.2 V (VIK), diverting undershoot energy away from downstream logic gates. This reduces reliance on board-level TVS devices, lowers BOM cost, and improves immunity to fast-edge noise in motor drive or relay-switching environments where ground bounce is common.
Is the SN74CBTS3306PWR pin-compatible with the SN74CBT3306PWR?
Yes, the SN74CBTS3306PWR is pin-compatible with the SN74CBT3306PWR - both use identical TSSOP-8 (PW) packaging and share the same pinout (VCC, 2OE, 2B, 2A, 1OE, 1A, 1B, GND). The primary difference is the inclusion of Schottky clamping diodes in the 'S' variant, which adds transient protection without altering mechanical or electrical pin assignments.
SN74CBTS3306PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTS
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-TSSOP
SN74CBTS3306PWR FAQ
1.How can I place an order for SN74CBTS3306PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTS3306PWR 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 SN74CBTS3306PWR reliable?
The price and inventory of SN74CBTS3306PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTS3306PWR is usually 5 days.
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Once your SN74CBTS3306PWR 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 SN74CBTS3306PWR?
For technical support, including SN74CBTS3306PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTS3306PWR requirements.
6.How does Aetrix verify that SN74CBTS3306PWR is sourced from the original manufacturer or authorized distributors?
All SN74CBTS3306PWR 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 SN74CBTS3306PWR meets industry standards.
7.What is the process for return or replacement of SN74CBTS3306PWR?
All SN74CBTS3306PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTS3306PWR, 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 SN74CBTS3306PWR part is unused and in its original packaging.
Return procedure for SN74CBTS3306PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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