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Texas Instruments SN74CBTS3306PW
- Part No.:
- SN74CBTS3306PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBTS3306PW.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
SN74CBTS3306PW 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 FPGA-to-ASIC interconnects.
For engineers reviewing the SN74CBTS3306PW datasheet, SN74CBTS3306PW pinout, SN74CBTS3306PW application, or SN74CBTS3306PW equivalent, key selection criteria include on-resistance matching, OE-controlled bidirectional switching latency, thermal performance in TSSOP-8, and compatibility with 3.3-V/5-V mixed-signal logic domains.
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 behavior is strictly level-sensitive: no latching or memory function exists. Propagation delay is RC-limited (typ. 0.25 ns at VCC = 5 V, CL = 50 pF), and disable timing (tdis) is faster than enable (ten), supporting precise bus turn-off sequencing in shared-data systems.
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 distortion in 50-Ω impedance-matched paths. |
| Propagation delay (tpd) | 0.25 ns max at VCC = 5 V, CL = 50 pF - supports >1 GHz data rates in short-reach digital interconnects. |
| Supply voltage range (VCC) | 4 V to 5.5 V - compatible with both 3.3-V LVTTL and 5-V TTL logic families without level shifters. |
| Input clamp voltage (VIK) | −1.2 V at II = −18 mA - protects downstream logic from −2-V transient undershoot common in hot-swap or cable-disconnect events. |
| Thermal resistance (θJA) | 149°C/W for TSSOP-8 package - requires derating above 65°C ambient in sustained 128-mA channel current operation. |
| Enable/disable timing (ten/tdis) | 5 ns / 4.3 ns max at VCC = 5 V - enables tight timing margins for synchronous bus arbitration and clock-domain crossing. |
| Control input thresholds (VIH/VIL) | 2 V / 0.8 V - fully compatible with standard TTL logic levels, eliminating need for external biasing. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, JEDEC MO-153 compliant, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive supply rail - must be decoupled locally with ≤100 nF ceramic capacitor to sustain fast-switching current transients. |
| 2 | 2OE | Active-low enable for second switch - drives high-impedance state on pins 3 (2B) and 4 (2A) when logic high. |
| 3 | 2B | Port B terminal of second switch - bidirectionally connected to 2A when 2OE = low; clamped to −1.2 V minimum. |
| 4 | 2A | Port A terminal of second switch - electrically identical to 2B; shares same on-resistance and timing specs. |
| 5 | 1OE | Active-low enable for first switch - independently controls connection between pins 6 (1A) and 7 (1B). |
| 6 | 1A | Port A terminal of first switch - supports 128 mA continuous current; Schottky diode limits reverse current. |
| 7 | 1B | Port B terminal of first switch - interchangeable with 1A; no directionality or master/slave assignment. |
| 8 | GND | Reference ground - must be low-inductance connection to minimize ground bounce during simultaneous switching. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Minimizes insertion loss and duty-cycle distortion in high-speed digital signals up to 500 Mbps. |
| TTL-compatible control inputs | Eliminates need for level translators when interfacing with legacy 5-V microcontrollers or FPGAs. |
| Integrated Schottky clamps | Prevents latch-up and I/O damage from −2-V undershoot transients without external diodes. |
| Independent dual-channel control | Enables selective isolation of two independent data lines (e.g., address vs. data bus segments) with no crosstalk. |
| 149°C/W thermal resistance (TSSOP) | Supports 128 mA per channel at ≤65°C ambient without heatsinking in compact PCB layouts. |
Applications
| PCI Express Gen1 Interconnect Isolation | FPGA Configuration Bus Switching |
|---|---|
|
Use Scenario: Isolating PCIe reference clock and sideband signals between host CPU and add-in card during hot-plug detection. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling clock and PERST# paths under firmware control. Use Value: Prevents signal reflection and ground bounce during insertion/removal while maintaining <1 ns skew between differential pairs. |
Use Scenario: Routing configuration bitstreams from flash memory to multiple FPGA banks with dynamic bank selection. IC Role / Device Role / Timing Role: Dual-channel data path selector that isolates unused configuration lanes to reduce capacitive loading. Use Value: Reduces configuration time by 18% versus multiplexed routing and eliminates cross-talk-induced bit errors in JTAG chains. |
| Industrial Ethernet PHY Interface | Automotive Infotainment Data Multiplexing |
|
Use Scenario: Switching MDIO/MDC management interface between MCU and multiple Ethernet PHYs in a ring topology. IC Role / Device Role / Timing Role: Low-latency, bidirectional bus switch enabling shared PHY register access without protocol translation. Use Value: Enables deterministic 2.5 µs register read/write turnaround using native MDIO timing, avoiding software polling overhead. |
Use Scenario: Sharing a single LVDS display interface between instrument cluster MCU and head-unit processor in dual-display mode. IC Role / Device Role / Timing Role: High-fidelity analog switch preserving LVDS common-mode voltage and edge rate integrity. Use Value: Maintains <15 ps channel-to-channel skew across 24-bit RGB + sync lines, meeting MIPI D-PHY v1.2 eye diagram requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CB3Q3245PW | 8-bit wide, 3.3-V only, 4-Ω ron, higher ICC (12 µA), no Schottky clamps | Requires external undershoot protection; suited for fixed-width parallel buses, not dual independent channels | Choose when scaling to 8-bit data paths with tighter ron tolerance and lower VCC headroom. |
| 74LVC1G3157GW | Single-channel, 1.65–5.5-V operation, 10-Ω ron, 3.5 ns tpd, no I/O clamps | Lacks dual independent control; requires two units for equivalent functionality; higher propagation delay | Prefer for space-constrained designs needing single-line isolation with wider voltage flexibility but lower speed demand. |
Compared with SN74CBTS3306PW, SN74CB3Q3245PW offers higher integration but sacrifices independent channel control and undershoot resilience, while 74LVC1G3157GW trades dual-channel capability for broader supply range and smaller footprint - neither provides pin-compatible replacement.
Availability
SN74CBTS3306PW is available at Aetrix Electronics and suitable for FPGA interconnects, industrial Ethernet PHY management, and automotive infotainment data routing requiring stable component supply across extended temperature ranges.
Supply support for SN74CBTS3306PW 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 U.S.-based semiconductor company specializing in analog, embedded processing, and connectivity solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBTS3306PW belongs to TI's CBTS-series bus switch family, designed specifically for low-distortion, high-speed digital signal routing in mixed-voltage systems where signal integrity and transient resilience are critical.
FAQ
What is the maximum continuous current rating per channel for the SN74CBTS3306PW?
The SN74CBTS3306PW supports up to 128 mA continuous channel current per switch, verified under recommended operating conditions (VCC = 4–5.5 V, TA = −40°C to 85°C). Exceeding this limit risks thermal runaway due to its 149°C/W junction-to-ambient thermal resistance in the TSSOP-8 package. Derating is required above 65°C ambient temperature.
Does the SN74CBTS3306PW support 3.3-V logic inputs while operating at 5-V VCC?
Yes, the SN74CBTS3306PW accepts 3.3-V logic-level inputs at its OE pins even when VCC = 5 V, because its VIH threshold is specified at 2 V min and VIL at 0.8 V max - well within 3.3-V CMOS logic swing. No level-shifting circuitry is needed, making it ideal for mixed-voltage board designs.
Can the SN74CBTS3306PW be used in bidirectional analog signal paths such as I²C or SMBus?
No - the SN74CBTS3306PW is not rated for open-drain bus protocols like I²C or SMBus. Its internal structure lacks weak pull-up capability and its 5-Ω on-resistance creates excessive voltage drop on pull-up resistors. It is intended exclusively for push-pull digital signal isolation, not wired-AND bus topologies.
What is the purpose of the Schottky diodes on the I/O pins of the SN74CBTS3306PW?
The Schottky diodes on all I/O pins of the SN74CBTS3306PW clamp negative undershoot transients to −1.2 V (at −18 mA), protecting downstream CMOS inputs from latch-up or oxide damage during hot-swap, cable disconnect, or ESD events. This eliminates the need for external clamping diodes in ruggedized industrial interfaces.
Is the SN74CBTS3306PW pin-compatible with other members of the SN74CBTS3306 family?
Yes - the SN74CBTS3306PW shares identical pinout and electrical specifications with SN74CBTS3306D (SOIC-8) and SN74CBTS3306PWR (TSSOP-8 tape-and-reel), differing only in package dimensions and thermal characteristics. Layout reuse is possible between PW and PWR variants; SOIC-8 requires footprint adaptation.
SN74CBTS3306PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTS
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
SN74CBTS3306PW FAQ
1.How can I place an order for SN74CBTS3306PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTS3306PW 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 SN74CBTS3306PW reliable?
The price and inventory of SN74CBTS3306PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTS3306PW is usually 5 days.
3.What payment methods are accepted for SN74CBTS3306PW?
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4.How is shipping managed for SN74CBTS3306PW?
SN74CBTS3306PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTS3306PW 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 SN74CBTS3306PW?
For technical support, including SN74CBTS3306PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTS3306PW requirements.
6.How does Aetrix verify that SN74CBTS3306PW is sourced from the original manufacturer or authorized distributors?
All SN74CBTS3306PW 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 SN74CBTS3306PW meets industry standards.
7.What is the process for return or replacement of SN74CBTS3306PW?
All SN74CBTS3306PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTS3306PW, 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 SN74CBTS3306PW part is unused and in its original packaging.
Return procedure for SN74CBTS3306PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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