SN74CBT3245ADWR - Octal FET Bus Switch | Texas Instruments
MPN: SN74CBT3245ADWR β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.55 | $5.50 |
| 100 | $0.45 | $45.00 |
| 500 | $0.38 | $190.00 |
| 1,000 | $0.32 | $320.00 |
Drop-in alternatives for SN74CBT3245ADWR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74CBT3245CDWR
β Drop-Inπ Reference alternative (not in catalog)
SN74CBT3245ADW
β Drop-Inπ Reference alternative (not in catalog)
SN74CBT3245ADWRG4
β Drop-Inπ Reference alternative (not in catalog)
74CBT3245D
β Drop-Inπ Reference alternative (not in catalog)
SN74CBT3245ADWR Maximum Ratings & Electrical Characteristics
| Configuration | 8 x 1:1 (SPST) |
| Number of Channels | 8 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| On-State Resistance (Typ) | 5 ohm |
| Propagation Delay | 250 ps |
| Bandwidth | [DATA_NEEDED: Bandwidth] |
| Control Inputs | 1 (OE) |
| Operating Temperature Range | -40C to +85C |
| Package | SOIC-20 (DW) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Logic Family | CBT |
| Number of Bits | 8 |
| Output Type | Bidirectional |
| Supply Current (Max) | [DATA_NEEDED: Supply Current] |
SN74CBT3245ADWR Pin Configuration
| Pin 1 | 1A1 β Switch channel 1, port A |
| Pin 2 | 1B1 β Switch channel 1, port B |
| Pin 3 | 2A1 β Switch channel 2, port A |
| Pin 4 | 2B1 β Switch channel 2, port B |
| Pin 5 | 3A1 β Switch channel 3, port A |
| Pin 6 | 3B1 β Switch channel 3, port B |
| Pin 7 | 4A1 β Switch channel 4, port A |
| Pin 8 | 4B1 β Switch channel 4, port B |
| Pin 9 | GND β Ground |
| Pin 10 | 5B1 β Switch channel 5, port B |
| Pin 11 | 5A1 β Switch channel 5, port A |
| Pin 12 | 6B1 β Switch channel 6, port B |
| Pin 13 | 6A1 β Switch channel 6, port A |
| Pin 14 | 7B1 β Switch channel 7, port B |
| Pin 15 | 7A1 β Switch channel 7, port A |
| Pin 16 | 8B1 β Switch channel 8, port B |
| Pin 17 | 8A1 β Switch channel 8, port A |
| Pin 18 | OE β Output enable (active low) |
| Pin 19 | VCC β Power supply (4.5V to 5.5V) |
| Pin 20 | NC β No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN74CBT3245ADWR is suitable for 6 applications: Bus Isolation, Hot-Swap and Power-Down Isolation, Signal Routing in Networking Equipment, Test and Measurement Equipment, Industrial Control Systems, Consumer Electronics.
Bus Isolation
The SN74CBT3245ADWR is ideal for isolating buses in microprocessor systems. Its low on-state resistance (5 ohm) and fast propagation delay (250 ps) ensure minimal signal degradation. By using the OE pin, the bus can be disconnected during power-down or testing, preventing backfeed and contention. This is critical in multi-board systems where one board may be powered down while others remain active. The device supports bidirectional switching, allowing flexible bus architectures.
Recommended
Hot-Swap and Power-Down Isolation
In hot-swap applications, the SN74CBT3245ADWR prevents glitches on the bus during card insertion or removal. The OE pin can be driven low to disable the switch, isolating the card from the backplane. Its low capacitance and high bandwidth minimize signal distortion, making it suitable for high-speed data buses. The device operates from 4.5V to 5.5V, compatible with standard logic levels. This ensures reliable operation in redundant power systems.
Recommended
Signal Routing in Networking Equipment
The SN74CBT3245ADWR is used in networking equipment for routing signals between different line cards or interfaces. Its high bandwidth and low propagation delay ensure minimal impact on signal integrity. The device can handle TTL-level signals, making it compatible with common networking ICs. The 8-channel configuration allows efficient routing of multiple signals. The SOIC-20 package is compact, saving board space in dense designs.
Recommended
Test and Measurement Equipment
In test and measurement systems, the SN74CBT3245ADWR is used for switching test signals to different measurement paths. Its low on-state resistance and fast switching speed allow accurate signal routing without significant attenuation. The device's wide operating temperature range (-40Β°C to +85Β°C) ensures reliability in various environments. The OE pin enables remote control of signal paths, facilitating automated testing.
Recommended
Industrial Control Systems
The SN74CBT3245ADWR is suitable for industrial control systems where bus isolation and signal routing are required. Its robust design and wide temperature range make it suitable for harsh environments. The device can be used to isolate different control modules, preventing electrical noise from propagating. The low power consumption is beneficial for energy-efficient designs. The standard 245 pinout simplifies PCB layout and reduces design time.
Recommended
Consumer Electronics
In consumer electronics, the SN74CBT3245ADWR is used for switching audio or data signals in devices like set-top boxes and gaming consoles. Its low on-state resistance ensures minimal signal loss, preserving audio/video quality. The device's small SOIC-20 package is ideal for space-constrained designs. The OE pin allows power-saving modes by disabling unused signal paths. This makes it a versatile choice for various consumer applications.
Recommended
Recommended Products Summary
Engineering reference data for SN74CBT3245ADWR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74CBT3245CDWR | SN74CBT3245ADW | SN74CBT3245ADWRG4 | 74CBT3245D |
|---|---|---|---|---|---|
| Package | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Undershoot Protection | No | Yes (-2V) | No | No | [DATA_NEEDED] |
| On-State Resistance (Typ) | 5 ohm | 5 ohm | 5 ohm | 5 ohm | [DATA_NEEDED] |
| Propagation Delay | 250 ps | 250 ps | 250 ps | 250 ps | [DATA_NEEDED] |
| Supply Voltage Range | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | [DATA_NEEDED] |
| Operating Temperature Range | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | [DATA_NEEDED] |
| Lifecycle Status | EOL | Active | EOL | EOL | [DATA_NEEDED] |
Key Differentiators
- Low on-state resistance of 5 ohm (vs SN74CBT3245CDWR)
- Standard 245-type pinout (vs 74CBT3245D)
- Wide operating temperature range (vs SN74CBT3245ADW)
Design Notes
Ensure the OE pin is properly controlled to avoid bus contention. When OE is high, the switch is disabled, and the outputs are high-impedance. Do not drive the switch with voltages exceeding VCC, as this can damage the device. Also, avoid exceeding the maximum junction temperature by providing adequate PCB copper for heat dissipation.
Place decoupling capacitors (0.1uF) close to the VCC pin to filter high-frequency noise. Use a solid ground plane to minimize inductance and improve signal integrity. Keep signal traces short and matched in length to reduce skew. The SOIC-20 package has a standard footprint, so layout guidelines from the TI datasheet should be followed.
The low on-state resistance (5 ohm) and fast propagation delay (250 ps) make the SN74CBT3245ADWR suitable for high-speed signals. However, at frequencies above 100 MHz, consider the capacitance of the switch, which can cause signal degradation. Use proper termination and impedance matching to maintain signal quality. The device is not intended for analog signals requiring high linearity.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified. Lead-free per TI.
