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Texas Instruments SN74CBT3306PWRE4
- Part No.:
- SN74CBT3306PWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3306PWRE4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,462
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Product details
Overview
SN74CBT3306PWRE4 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 across −40°C to 85°C. It enables bidirectional signal routing in low-voltage data paths such as address/data bus isolation in microcontroller peripherals and memory expansion interfaces.
For engineers reviewing the SN74CBT3306PWRE4 datasheet, SN74CBT3306PWRE4 pinout, SN74CBT3306PWRE4 application, or SN74CBT3306PWRE4 equivalent, key selection criteria include on-resistance matching (5–7 Ω), 50-pF load switching speed (tpd = 0.25 ns at VCC = 5 V), OE-controlled disconnect timing (ten = 5 ns, tdis = 4.6 ns), and TSSOP-8 thermal performance (θJA = 149°C/W).
Technical Context
The SN74CBT3306PWRE4 implements two independent single-pole single-throw (SPST) analog switches using NMOS pass transistors with integrated level-shifting circuitry for TTL-compatible enable inputs. Each switch connects A and B ports bidirectionally when its OE input is logic low (≤0.8 V), and presents high-impedance isolation (>10⁹ Ω) when OE is high (≥2 V).
It operates from 4 V to 5.5 V supply, supports ±1 μA input leakage and 3 μA quiescent ICC, and maintains consistent on-resistance (ron = 5–7 Ω) across VI = 0–3 V signal swing. Switching is characterized at CL = 50 pF with propagation delay dominated by RC time constant of ron and load capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage I/O domains without level shifters. |
| ron (Typ) | 5 Ω - Enables <100-mV voltage drop at 64-mA channel current, preserving signal integrity in high-speed digital buses. |
| tpd (Max) | 0.35 ns at VCC = 4 V - Supports >1-GHz data rates in short-reach interconnects with minimal timing skew. |
| ten / tdis | 5.6 ns / 4.6 ns - Allows precise enable/disable sequencing in synchronous bus arbitration and hot-swap control circuits. |
| Cio(OFF) | 4 pF - Limits capacitive loading during disable state, reducing crosstalk and maintaining signal rise/fall times. |
| VIH / VIL | 2 V / 0.8 V - Guarantees reliable recognition of standard TTL logic levels without external biasing networks. |
Pinout & Package
TSSOP-8 package (PW), 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, JEDEC MO-153 compliant. RoHS-compliant, lead-finish NiPdAu.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Enable input for Channel 1 | Active-low control: drives Channel 1 (1A ↔ 1B) into low-Z conduction when ≤0.8 V; high-Z isolation when ≥2 V. |
| 2 (1A) | Channel 1 input/output A | Bidirectional signal terminal; electrically identical to 1B when enabled; no internal directionality or drive strength asymmetry. |
| 3 (1B) | Channel 1 input/output B | Bidirectional signal terminal; mirrors 1A behavior; supports equal AC/DC loading in either direction. |
| 4 (GND) | Power ground reference | Common return path for all internal FET sources and control logic; must be low-impedance to minimize ground bounce during switching. |
| 5 (VCC) | Positive supply rail | Provides operating voltage for internal level shifters and pass transistors; bypass capacitor required near pin for transient current stability. |
| 6 (2OE) | Enable input for Channel 2 | Independent active-low control for Channel 2 (2A ↔ 2B); allows asynchronous enable/disable of second bus segment. |
| 7 (2B) | Channel 2 input/output B | Second bidirectional port; fully isolated from Channel 1 except via shared VCC/GND; no cross-talk coupling above 4 pF. |
| 8 (2A) | Channel 2 input/output A | Second bidirectional port; matches 2B electrical characteristics; supports independent bus segmentation or redundancy switching. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω typical on-resistance | Minimizes insertion loss and voltage droop in 3.3-V/5-V digital signal paths, enabling clean logic-level transmission up to 100-MHz clock domains. |
| TTL-compatible control inputs | Eliminates need for external pull-up resistors or level translators when interfacing with legacy 5-V microcontrollers or FPGA I/O banks. |
| Independent dual-channel operation | Allows simultaneous but separate control of two data lines-e.g., isolating upper/lower byte lanes in 16-bit parallel interfaces without shared timing constraints. |
| Low 4-pF off-capacitance | Reduces capacitive loading on adjacent traces during disable state, preserving signal edge rates and minimizing crosstalk in dense PCB layouts. |
Applications
| Memory Expansion Interface | Microcontroller Peripheral Isolation |
|---|---|
Use Scenario: Adding external SRAM or Flash memory to an MCU with limited native address/data bus pins. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling dynamic connection/disconnection of memory address and data lines during bank switching or power-down modes. Use Value: Prevents contention between internal and external memory controllers while maintaining sub-nanosecond propagation delay for timing-critical read/write cycles. | Use Scenario: Sharing a single UART or SPI interface among multiple peripheral devices (e.g., sensors, displays) on a shared bus. IC Role / Device Role / Timing Role: Signal path selector that routes TX/RX or MOSI/MISO lines to one device at a time under software-controlled OE signals. Use Value: Eliminates need for multiplexed I/O firmware overhead and avoids signal integrity degradation caused by stub traces in daisy-chained topologies. |
| Hot-Swappable Module Interface | Legacy Bus Signal Conditioning |
Use Scenario: Enabling safe insertion/removal of daughterboards carrying I²C or SMBus sensors in industrial control systems. IC Role / Device Role / Timing Role: Isolation gate placed between backplane and module connector; OE asserted only after mechanical mating and power stabilization. Use Value: Blocks inrush current and prevents bus lockup during hot-plug events while supporting full-speed communication once enabled. | Use Scenario: Interfacing modern 3.3-V FPGAs with legacy 5-V parallel peripherals (e.g., LCD controllers, EPROM programmers). IC Role / Device Role / Timing Role: Voltage-transparent signal bridge that passes logic levels unchanged while blocking DC current flow between mismatched supply domains. Use Value: Avoids level-shifter latency and power consumption penalties while preserving nanosecond-scale timing margins in high-throughput data transfers. |
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 |
|---|---|---|---|
| SN74CBTD3306PWRE4 | Includes bus-hold circuitry on A/B ports; higher ICC (10 μA typ); same ron (5–7 Ω) and pinout. | Preferred where floating-bus immunity is required without external pull resistors; unsuitable if bus-hold causes unintended latching. | Select SN74CBTD3306PWRE4 only when bus-hold functionality is explicitly needed; otherwise SN74CBT3306PWRE4 offers lower static power and simpler biasing. |
| 74LVC2G66DP,125 | Single-channel, 3.3-V only (1.65–5.5 V), ron = 8 Ω (typ), smaller XSON-8 package (2.0 × 1.25 mm). | Suitable for space-constrained designs requiring only one switch; lacks independent dual-channel control and 5-V tolerance. | Choose 74LVC2G66DP,125 for compact 3.3-V-only systems; SN74CBT3306PWRE4 remains optimal for dual-channel, 5-V tolerant, TSSOP-8 footprint applications. |
Compared with SN74CBTD3306PWRE4 and 74LVC2G66DP,125, the SN74CBT3306PWRE4 delivers the lowest quiescent current (3 μA), widest supply range (4–5.5 V), and true dual-channel independence-making it ideal for robust, low-power, 5-V bus isolation where bus-hold is unnecessary and board area permits TSSOP-8.
Availability
SN74CBT3306PWRE4 is available at Aetrix Electronics and suitable for memory expansion interfaces, microcontroller peripheral isolation, and hot-swappable module interfaces requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT3306PWRE4 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The SN74CBT3306PWRE4 belongs to TI's CBT (Crossbar Bus Transceiver) family, designed specifically for low-latency, low-distortion signal routing in high-speed digital systems where minimal propagation delay and predictable on-resistance are critical.
FAQ
What is the maximum continuous channel current rating for the SN74CBT3306PWRE4?
The SN74CBT3306PWRE4 has a maximum continuous channel current rating of 128 mA per switch, verified under absolute maximum ratings conditions. This value defines the upper limit for sustained DC current through the A–B path without thermal damage. Operation at this level requires careful PCB thermal design due to the TSSOP-8 package's θJA of 149°C/W; derating is recommended above 85°C ambient.
Does the SN74CBT3306PWRE4 support bidirectional signal flow between its A and B ports?
Yes, the SN74CBT3306PWRE4 supports fully bidirectional signal flow between each A and B port pair. Its NMOS-based FET switch architecture imposes no inherent directionality-voltage and current can pass equally from A to B or B to A when the corresponding OE input is asserted low. This makes the SN74CBT3306PWRE4 suitable for data, address, and control lines in both transmit and receive directions.
Can the SN74CBT3306PWRE4 operate reliably at 3.3 V supply voltage?
No-the SN74CBT3306PWRE4 is specified only for VCC = 4 V to 5.5 V per its recommended operating conditions. At 3.3 V, the internal level-shifting circuitry fails to guarantee proper TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), and on-resistance increases beyond 7 Ω, degrading signal integrity. For 3.3-V systems, consider the SN74LVC2G66 or SN74CB3Q3245 families instead of the SN74CBT3306PWRE4.
What is the thermal impedance (θJA) of the SN74CBT3306PWRE4 in its TSSOP-8 package?
According to TI's datasheet SCDS016H, the SN74CBT3306PWRE4 in the TSSOP-8 (PW) package has a junction-to-ambient thermal impedance (θJA) of 149°C/W under standard JEDEC test conditions. This value assumes a 2-layer PCB with minimal copper pour; actual thermal performance improves significantly with internal ground/power planes and thermal vias beneath the exposed pad (if present) or GND/VCC pins.
Is the SN74CBT3306PWRE4 pin-compatible with the SOIC-8 version SN74CBT3306DR?
Yes-the SN74CBT3306PWRE4 (TSSOP-8) and SN74CBT3306DR (SOIC-8) share identical pin numbering, pin functions, and logic behavior. Both use the same 1OE/1A/1B/GND/VCC/2OE/2B/2A ordering. However, due to differing package dimensions and soldering profiles, PCB layout and reflow parameters must be adjusted; the SN74CBT3306PWRE4 cannot be substituted onto an SOIC-8 footprint without redesign.
SN74CBT3306PWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
SN74CBT3306PWRE4 FAQ
1.How can I place an order for SN74CBT3306PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3306PWRE4 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 SN74CBT3306PWRE4 reliable?
The price and inventory of SN74CBT3306PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3306PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74CBT3306PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3306PWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3306PWRE4?
SN74CBT3306PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3306PWRE4 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 SN74CBT3306PWRE4?
For technical support, including SN74CBT3306PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3306PWRE4 requirements.
6.How does Aetrix verify that SN74CBT3306PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3306PWRE4 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 SN74CBT3306PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3306PWRE4?
All SN74CBT3306PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3306PWRE4, 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 SN74CBT3306PWRE4 part is unused and in its original packaging.
Return procedure for SN74CBT3306PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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