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Texas Instruments SN74CBT3306DRG4
- Part No.:
- SN74CBT3306DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT3306DRG4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,371
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Product details
Overview
SN74CBT3306DRG4 from Texas Instruments is a dual FET bus switch IC with independent 5-Ω on-state resistance switches, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and operation over −40°C to 85°C. It enables bidirectional signal routing in low-voltage digital systems such as address/data bus isolation in microcontroller peripherals and memory expansion interfaces.
For engineers reviewing the SN74CBT3306DRG4 datasheet, SN74CBT3306DRG4 pinout, SN74CBT3306DRG4 application, or SN74CBT3306DRG4 equivalent, key selection criteria include on-resistance matching (5–7 Ω), fast enable/disable timing (ten = 1.8 ns, tdis = 1 ns at VCC = 5 V), low input capacitance (3 pF), and TSSOP-8 package compatibility with high-density PCB layouts.
Technical Context
The SN74CBT3306DRG4 implements two independent transmission-gate-based FET switches controlled by separate OE inputs; each switch connects A and B ports when OE is low and isolates them when OE is high. Its architecture avoids latch-up and supports rail-to-rail analog/digital signal pass-through up to VCC = 5.5 V.
It operates without internal level-shifting circuitry-switch conduction is governed solely by gate drive relative to VCC and GND-making it suitable for unidirectional or bidirectional data paths where voltage translation is not required. The device draws only 3 μA ICC at VCC = 5.5 V and exhibits minimal charge injection (<1 pC typical) due to matched FET geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V, II = 30 mA - ensures <150 mV voltage drop under 30 mA load, preserving logic margin in 3.3-V/5-V systems. |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V, CL = 50 pF - enables sub-nanosecond signal routing critical for high-speed parallel bus applications. |
| Enable time (ten) | 1.8 ns at VCC = 5 V - allows rapid bus arbitration and dynamic channel switching in real-time peripheral multiplexing. |
| Disable time (tdis) | 1 ns at VCC = 5 V - minimizes glitch risk during hot-swap or power sequencing transitions. |
| Input capacitance (Ci) | 3 pF per control input - reduces loading on upstream drivers and maintains signal integrity in fan-out-constrained designs. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed 3.3-V/5-V system backplanes via level-shifter-free interface. |
| Operating temperature | −40°C to 85°C - qualified for industrial-grade embedded control and instrumentation environments. |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant matte tin lead finish, MSL Level 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE1) | Channel 1 output-enable control | Active-low logic input; drives Channel 1 (1A ↔ 1B) into high-impedance state when high. |
| 2 (1A) | Channel 1 port A terminal | Bidirectional signal node; electrically identical to 1B when OE1 = L; no internal directionality. |
| 3 (1B) | Channel 1 port B terminal | Bidirectional signal node; forms low-resistance path with 1A when OE1 = L. |
| 4 (GND) | Power ground reference | Return path for all internal FET sources and bias networks; must be low-inductance connection. |
| 5 (VCC) | Positive supply rail | Supplies gate drive and internal bias; decoupling capacitor (0.1 μF) required within 5 mm of this pin. |
| 6 (OE2) | Channel 2 output-enable control | Independent active-low control for Channel 2 (2A ↔ 2B); enables asynchronous switching of dual buses. |
| 7 (2B) | Channel 2 port B terminal | Bidirectional node; isolated from 2A when OE2 = H; matches 1B electrical characteristics. |
| 8 (2A) | Channel 2 port A terminal | Bidirectional node; functionally symmetric to 2B; supports identical current and timing specs. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω matched on-resistance | Ensures uniform signal attenuation across both channels and minimizes skew between parallel data lines. |
| TTL-compatible control inputs | Accepts standard 5-V TTL logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) without external level shifters. |
| Sub-2-ns enable/disable timing | Supports dynamic bus reconfiguration at >500 MHz effective switching rates in burst-mode protocols. |
| Low 3-pF input capacitance | Reduces capacitive loading on microcontroller GPIOs or FPGA I/O banks driving OE signals. |
| Rail-to-rail analog/digital pass-through | Transmits signals from GND to VCC without clipping-enabling use in mixed-signal test fixtures and sensor multiplexing. |
Applications
| Microcontroller Bus Isolation | Memory Expansion Interface |
|---|---|
Use Scenario: Isolating shared address/data bus between MCU and multiple peripheral ICs (e.g., ADC, DAC, EEPROM) to prevent contention during concurrent access. IC Role / Device Role / Timing Role: Dual-channel bidirectional switch enabling time-multiplexed bus sharing with nanosecond-scale channel enable/disable control. Use Value: Eliminates need for tristate buffers or complex arbitration logic while maintaining signal integrity at 20-MHz bus clock rates. | Use Scenario: Connecting multiple SRAM or Flash devices to a single microprocessor data bus using OE-controlled channel selection. IC Role / Device Role / Timing Role: Low-latency bus switch providing <2 ns channel switching to support fast page-mode memory reads/writes. Use Value: Reduces address decode complexity and PCB trace count versus discrete buffer solutions, saving >30% board area in compact modules. |
| FPGA I/O Multiplexing | Test Fixture Signal Routing |
Use Scenario: Dynamically rerouting JTAG, SPI, or UART signals from FPGA I/O banks to different target devices on a production test board. IC Role / Device Role / Timing Role: Bidirectional signal path selector with matched on-resistance ensuring consistent rise/fall times across all routed channels. Use Value: Enables single-tester hardware to validate multiple board variants without manual jumper changes or firmware reconfiguration. | Use Scenario: Building automated test equipment that routes stimulus signals (e.g., clock, reset, data) to DUT pins under software control. IC Role / Device Role / Timing Role: Precision analog/digital switch supporting DC–100 MHz signal pass-through with <150 mV max voltage drop at 30 mA. Use Value: Provides repeatable, low-distortion signal routing without relay wear-out or mechanical hysteresis in high-cycle automated testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3306PWR | Includes bus-hold circuitry on A/B ports; higher ICC (10 μA typical); same ron (5–7 Ω) and timing. | Required where floating-bus immunity is critical (e.g., unpopulated slots in modular backplanes). | Select SN74CBTD3306PWR only if bus-hold functionality is explicitly needed; otherwise SN74CBT3306DRG4 offers lower quiescent current. |
| 74LVC2G66DP,125 | Single-channel; 5.5-Ω ron; 3.3-V only supply (1.65–5.5 V); smaller XSON-8 (2.1 × 1.6 mm) package. | Suitable for space-constrained 3.3-V-only designs requiring one switch channel instead of two. | Use 74LVC2G66DP,125 when footprint reduction or 3.3-V native operation outweighs need for dual-channel integration. |
Compared with SN74CBTD3306PWR and 74LVC2G66DP,125, the SN74CBT3306DRG4 delivers optimal balance of dual-channel density, 5-V compatibility, ultra-low ICC (3 μA), and industry-standard TSSOP-8 layout-making it preferred for industrial microcontroller bus management where bus-hold is unnecessary and supply flexibility matters.
Availability
SN74CBT3306DRG4 is available at Aetrix Electronics and suitable for microcontroller bus isolation, memory expansion interfaces, FPGA I/O multiplexing, and automated test fixture signal routing requiring stable component supply and long-term industrial availability.
Supply support for SN74CBT3306DRG4 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 founded in 1930, specializing in analog, embedded processing, and logic ICs with global manufacturing and quality certification to ISO 9001 and IATF 16949 standards.
The SN74CBT3306DRG4 belongs to TI's CBT (Crossbar Bus Transceiver) logic family, designed specifically for low-latency, low-distortion bidirectional signal routing in high-speed digital systems without level translation.
FAQ
What is the maximum continuous current rating for each switch channel in the SN74CBT3306DRG4?
The SN74CBT3306DRG4 supports a continuous channel current of 128 mA per switch, verified under absolute maximum ratings. This rating applies to steady-state DC conduction through either 1A–1B or 2A–2B path when enabled. Derating is required above 70°C ambient per θJA = 149°C/W for the TSSOP-8 package.
Does the SN74CBT3306DRG4 support bidirectional signal flow, and is direction controlled by external logic?
Yes, the SN74CBT3306DRG4 supports fully bidirectional signal flow on both channels-neither A nor B port is designated as input or output. Direction is determined entirely by external signal source/sink configuration; the device imposes no inherent directionality. Control is limited to enable/disable via OE1 and OE2 pins.
Can the SN74CBT3306DRG4 operate reliably at 3.3 V supply voltage?
No-the SN74CBT3306DRG4 is specified only for VCC = 4 V to 5.5 V per recommended operating conditions. At 3.3 V, the on-resistance rises significantly (>15 Ω), propagation delay degrades, and TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) may not be met reliably. Use 74LVC2G66 or SN74CB3Q3245 for 3.3-V operation.
What is the thermal performance of the SN74CBT3306DRG4 in its TSSOP-8 package?
The SN74CBT3306DRG4 in TSSOP-8 (PW) package has a junction-to-ambient thermal impedance (θJA) of 149°C/W, measured per JESD 51-7. With 3 μA ICC and <1 mW dynamic power under typical switching, self-heating is negligible at room temperature-but PCB copper area and airflow must be considered for sustained 128 mA loads near 85°C ambient.
Is the SN74CBT3306DRG4 pin-compatible with other members of the SN74CBT3306 family?
Yes-the SN74CBT3306DRG4 shares identical pinout, electrical behavior, and functional logic with SN74CBT3306D, SN74CBT3306DR, SN74CBT3306PW, and SN74CBT3306PWR. All variants use the same die and differ only in packaging, marking, and tape/reel configuration; no PCB redesign is needed when migrating between them.
SN74CBT3306DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
SN74CBT3306DRG4 FAQ
1.How can I place an order for SN74CBT3306DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3306DRG4 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 SN74CBT3306DRG4 reliable?
The price and inventory of SN74CBT3306DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3306DRG4 is usually 5 days.
3.What payment methods are accepted for SN74CBT3306DRG4?
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4.How is shipping managed for SN74CBT3306DRG4?
SN74CBT3306DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3306DRG4 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 SN74CBT3306DRG4?
For technical support, including SN74CBT3306DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3306DRG4 requirements.
6.How does Aetrix verify that SN74CBT3306DRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3306DRG4 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 SN74CBT3306DRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3306DRG4?
All SN74CBT3306DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3306DRG4, 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 SN74CBT3306DRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3306DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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