My Inquiry
My Account
Texas Instruments SN74CBT3306PW
- Part No.:
- SN74CBT3306PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3306PW.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,060
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CBT3306PW 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 digital buses such as address/data lines in microcontroller peripherals and memory expansion interfaces.
For engineers reviewing the SN74CBT3306PW datasheet, SN74CBT3306PW pinout, SN74CBT3306PW application, or SN74CBT3306PW equivalent, key selection criteria include on-resistance matching (5–7 Ω), sub-1 ns propagation delay (tpd = 0.25 ns at 5 V), OE-controlled isolation, and TSSOP-8 thermal performance (θJA = 149°C/W).
Technical Context
The SN74CBT3306PW implements two independent transmission-gate-based FET switches, each controlled by a dedicated OE input that disconnects the A–B path when high. Its architecture avoids latch-up and supports hot-swap capability due to rail-to-rail I/O voltage tolerance (−0.5 V to 7 V) and no internal level-shifting circuitry.
Each switch operates with zero static power draw in both on and off states (ICC = 3 μA max), and exhibits low capacitive loading-Cio(OFF) = 4 pF and Ci = 3 pF-making it suitable for high-speed, low-noise signal gating in 5-V TTL and mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω typical at 30–64 mA; ensures minimal voltage drop (<350 mV) and signal integrity in 5-V digital buses. |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V; supports >1 GHz signal switching without timing skew in parallel data paths. |
| Supply voltage range (VCC) | 4–5.5 V; compatible with standard 5-V logic rails and tolerant of transient overvoltage up to 7 V. |
| Input voltage range (VI) | −0.5 V to 7 V; enables safe interfacing with partially powered or hot-plugged subsystems. |
| Off-state capacitance (Cio) | 4 pF; limits crosstalk and maintains signal rise/fall times in high-density PCB layouts. |
| Operating temperature | −40°C to 85°C; qualified for industrial-grade embedded control and peripheral interface applications. |
| Package thermal impedance (θJA) | 149°C/W (TSSOP-8); requires modest copper area for thermal management in continuous 128-mA channel operation. |
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. Pin 1 marked with dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Channel 1 output-enable input | Active-low control: drives 1A–1B path to high-impedance state when logic high. |
| 2 (1A) | Channel 1 input/output terminal A | Bidirectional port; connects to upstream logic (e.g., MCU address line) with no direction pin required. |
| 3 (1B) | Channel 1 input/output terminal B | Bidirectional port; connects to downstream load (e.g., SRAM data bus) with symmetrical electrical behavior. |
| 4 (GND) | Ground reference | Common return for all switch channels and control logic; must be low-inductance connection for noise immunity. |
| 5 (VCC) | Positive supply | Power rail for FET gate drive and internal logic; bypassing with 0.1 μF ceramic capacitor near pin is mandatory. |
| 6 (2OE) | Channel 2 output-enable input | Independent active-low enable for second switch; allows asynchronous gating of separate signal pairs. |
| 7 (2B) | Channel 2 input/output terminal B | Second bidirectional port; electrically isolated from Channel 1 except via shared VCC/GND. |
| 8 (2A) | Channel 2 input/output terminal A | Second bidirectional port; supports identical timing and resistance specs as Channel 1. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Minimizes insertion loss and voltage droop in 5-V digital signal paths, preserving logic margins across 128-mA peak current. |
| TTL-compatible OE inputs | Accepts standard 5-V TTL logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) without external level shifters or pull-ups. |
| Zero static power consumption | ICC ≤ 3 μA ensures negligible quiescent current in always-on systems, critical for battery-backed or energy-sensitive designs. |
| Rail-to-rail I/O voltage support | Withstands −0.5 V to 7 V on all pins, enabling safe operation during power sequencing, hot insertion, or fault conditions. |
| Sub-nanosecond propagation delay | tpd = 0.25 ns at 5 V allows use in high-speed parallel interfaces (e.g., ISA, LPC, or legacy PCI add-in cards) without timing budget impact. |
Applications
| Memory Expansion Interface | Microcontroller Peripheral Multiplexing |
|---|---|
Use Scenario: Isolating address/data lines between a microcontroller and multiple SRAM or EPROM devices sharing a common bus. IC Role / Device Role / Timing Role: Dual-channel bidirectional bus switch enabling time-multiplexed access to discrete memory banks without contention. Use Value: 5-Ω ron and 0.25 ns tpd preserve signal edge integrity across 8-bit/16-bit parallel buses operating up to 100 MHz. |
Use Scenario: Routing UART, SPI, or GPIO signals between a main SoC and optional daughterboard peripherals (e.g., sensors, displays). IC Role / Device Role / Timing Role: Signal-level multiplexer controlled by firmware to enable/disable physical connections dynamically. Use Value: Independent OE pins allow per-channel enable timing synchronized to peripheral initialization sequences, avoiding bus glitches. |
| Legacy Bus Isolation | Hot-Swappable I/O Module |
Use Scenario: Electrically isolating ISA or LPC bus segments to prevent fault propagation between host and expansion cards. IC Role / Device Role / Timing Role: Fail-safe bus switch that disconnects upon OE assertion, eliminating DC coupling between domains. Use Value: −0.5 V to 7 V I/O rating and 4 pF Cio(OFF) ensure no signal leakage or capacitive coupling during disabled state. |
Use Scenario: Enabling safe insertion/removal of I/O modules in industrial PLC backplanes while main controller remains powered. IC Role / Device Role / Timing Role: Hot-swap protection device that gates power and signal paths under firmware control before mechanical engagement. Use Value: No latch-up risk and rail-to-rail tolerance allow operation during partial power-up; OE-driven isolation prevents backfeeding. |
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 |
|---|---|---|---|
| SN74CBTD3306PW | Includes bus-hold circuitry on A/B ports; higher ICC (10 μA); same ron and tpd. | Eliminates external pull-up resistors on floating bus lines; increases static power slightly. | Select when bus lines may float during OE disable and hold functionality is required. |
| 74LVC2G66DP | Lower VCC range (1.65–5.5 V); higher ron (10 Ω typ); smaller XSON-8 package (2.0 × 1.25 mm). | Supports 3.3-V and mixed-voltage systems; less suitable for legacy 5-V-only designs due to higher on-resistance. | Select for space-constrained 3.3-V applications where 5-Ω ron is not mandatory. |
Compared with SN74CBT3306PW, SN74CBTD3306PW adds bus-hold but increases quiescent current, while 74LVC2G66DP reduces footprint and voltage range at the cost of on-resistance and 5-V optimization-making SN74CBT3306PW optimal for industrial 5-V bus isolation requiring minimal insertion loss.
Availability
SN74CBT3306PW is available at Aetrix Electronics and suitable for memory expansion interfaces, microcontroller peripheral multiplexing, and legacy bus isolation requiring stable component supply and long-term industrial availability.
Supply support for SN74CBT3306PW 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 expertise in logic and interface solutions.
The SN74CBT3306PW belongs to TI's CBT (Crossbar Bus Transceiver) family, designed specifically for low-latency, low-loss signal gating in 5-V digital systems where timing integrity and bus contention prevention are critical.
FAQ
What is the maximum continuous current rating per channel of the SN74CBT3306PW?
The SN74CBT3306PW supports a continuous channel current of 128 mA per switch. This rating is defined under absolute maximum conditions and ensures reliable conduction without thermal runaway when used within recommended operating conditions (VCC = 4–5.5 V, TA = −40°C to 85°C). Exceeding this current may degrade on-resistance stability or accelerate wear-out.
Does the SN74CBT3306PW require external pull-up or pull-down resistors on its A/B ports?
No, the SN74CBT3306PW does not integrate bus-hold or weak termination circuitry, so external pull-up or pull-down resistors are required only if signal lines must maintain a defined logic state during OE-disabled periods. The device itself presents high-impedance (Hi-Z) when disabled, with Cio(OFF) = 4 pF ensuring minimal capacitive loading.
Can the SN74CBT3306PW operate with a 3.3-V supply voltage?
No-the SN74CBT3306PW is specified only for VCC = 4–5.5 V per the recommended operating conditions. At 3.3 V, the device may fail to fully turn on the FET switches, resulting in elevated on-resistance (>15 Ω), increased propagation delay, and potential logic threshold violations. For 3.3-V systems, consider 74LVC2G66DP instead.
What is the thermal performance difference between the SN74CBT3306PW and the SOIC-packaged SN74CBT3306D?
The SN74CBT3306PW (TSSOP-8) has a junction-to-ambient thermal impedance (θJA) of 149°C/W, compared to 97°C/W for the SOIC-8 (D) package. This means the TSSOP version runs hotter under identical power dissipation-requiring more PCB copper area or lower ambient temperatures to maintain safe junction temperatures during sustained 128-mA operation.
Is the SN74CBT3306PW pin-compatible with other members of the SN74CBT3306 family?
Yes-the SN74CBT3306PW shares identical pinout and function mapping with SN74CBT3306D, SN74CBT3306DR, and SN74CBT3306PWR. All variants use the same 8-pin topology (1OE, 1A, 1B, GND, VCC, 2OE, 2B, 2A), enabling direct substitution across SOIC and TSSOP packages without layout changes.
SN74CBT3306PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
SN74CBT3306PW FAQ
1.How can I place an order for SN74CBT3306PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3306PW 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 SN74CBT3306PW reliable?
The price and inventory of SN74CBT3306PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3306PW is usually 5 days.
3.What payment methods are accepted for SN74CBT3306PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3306PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3306PW?
SN74CBT3306PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3306PW 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 SN74CBT3306PW?
For technical support, including SN74CBT3306PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3306PW requirements.
6.How does Aetrix verify that SN74CBT3306PW is sourced from the original manufacturer or authorized distributors?
All SN74CBT3306PW 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 SN74CBT3306PW meets industry standards.
7.What is the process for return or replacement of SN74CBT3306PW?
All SN74CBT3306PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3306PW, 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 SN74CBT3306PW part is unused and in its original packaging.
Return procedure for SN74CBT3306PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CBT3306PW Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
