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 | $0.48 | $48.00 |
| 500 | $0.42 | $210.00 |
| 1,000 | $0.38 | $380.00 |
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)
SN74CBT3245ADWRE4
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)
MC74CBT3245ADWG
β Drop-Inπ Reference alternative (not in catalog)
SN74CBT3245ADWR Maximum Ratings & Electrical Characteristics
| Type | Octal FET Bus Switch |
| Configuration | 8 x 1:1 (SPST) |
| Number of Channels | 8 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| On-State Resistance (Ron) | 5 ohm (typical) |
| Propagation Delay | 250 ps (typical) |
| Bandwidth | [DATA_NEEDED: Bandwidth] |
| Control Inputs | 1 (OE) |
| Package | SOIC-20 (DW) |
| Operating Temperature Range | -40Β°C to +85Β°C |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
| Technology | CMOS |
| Logic Family | CBT |
| Pinout | Standard 245-type |
SN74CBT3245ADWR Pin Configuration
| Pin 1 | OE β Output enable (active low) |
| Pin 2 | A1 β Bus A port 1 |
| Pin 3 | A2 β Bus A port 2 |
| Pin 4 | A3 β Bus A port 3 |
| Pin 5 | A4 β Bus A port 4 |
| Pin 6 | A5 β Bus A port 5 |
| Pin 7 | A6 β Bus A port 6 |
| Pin 8 | A7 β Bus A port 7 |
| Pin 9 | A8 β Bus A port 8 |
| Pin 10 | GND β Ground |
| Pin 11 | B8 β Bus B port 8 |
| Pin 12 | B7 β Bus B port 7 |
| Pin 13 | B6 β Bus B port 6 |
| Pin 14 | B5 β Bus B port 5 |
| Pin 15 | B4 β Bus B port 4 |
| Pin 16 | B3 β Bus B port 3 |
| Pin 17 | B2 β Bus B port 2 |
| Pin 18 | B1 β Bus B port 1 |
| Pin 19 | GND β Ground |
| Pin 20 | VCC β Power supply (4.5V to 5.5V) |
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 provides eight bits of high-speed bus switching with low on-state resistance (5 ohm) and propagation delay (<250 ps), making it ideal for isolating buses in microprocessor systems. It allows signals to pass bidirectionally, and the OE pin can disable the switch to prevent bus contention during power sequencing or fault conditions. This ensures reliable operation in multi-board systems where bus isolation is critical for signal integrity.
Recommended
Hot-Swap and Power-Down Isolation
In hot-swap applications, the SN74CBT3245ADWR isolates a bus during power-up or power-down to prevent glitches and contention. Its low on-state resistance and high bandwidth ensure minimal signal degradation when the switch is enabled. The OE pin can be driven low to disable the switch, providing a high-impedance state that protects both the bus and the connected components. This makes it suitable for redundant power supplies and line cards in telecom equipment.
Recommended
Signal Routing in Networking Equipment
The SN74CBT3245ADWR is used for signal routing in networking and telecommunications equipment, where high-speed data buses require low insertion loss and minimal delay. Its 5-ohm on-state resistance and <250 ps propagation delay ensure that signals are transmitted with high fidelity. The device supports bidirectional switching, allowing it to route data in both directions, which is essential for Ethernet and other communication protocols. It is commonly found in switches, routers, and line cards.
Recommended
Test and Measurement Equipment
In test and measurement equipment, the SN74CBT3245ADWR is used to route signals between different test points or to isolate measurement circuits. Its low on-state resistance and high bandwidth ensure accurate signal transmission without distortion. The device's bidirectional capability allows it to be used in both input and output paths, making it versatile for various test configurations. The OE pin provides control for enabling or disabling the switch during measurements.
Recommended
Industrial Control Systems
The SN74CBT3245ADWR is used in industrial control systems for bus isolation and signal routing. Its wide operating temperature range (-40Β°C to +85Β°C) makes it suitable for harsh environments. The low on-state resistance ensures minimal signal loss, and the high bandwidth supports fast control signals. The device can be used to isolate different sections of a control system, preventing electrical noise from affecting sensitive circuits.
Recommended
Consumer Electronics
In consumer electronics, the SN74CBT3245ADWR is used for signal routing in devices such as set-top boxes, gaming consoles, and smart TVs. Its low power consumption and small SOIC-20 package make it suitable for space-constrained designs. The device's high bandwidth supports high-definition video and audio signals, ensuring minimal signal degradation. The OE pin allows for power management by disabling the switch when not in use.
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 | SN74CBT3245ADWRE4 | SN74CBT3245ADWRG4 | 74CBT3245D | MC74CBT3245ADWG |
|---|---|---|---|---|---|---|
| Package | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 | SOIC-20 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | onsemi |
| On-State Resistance (Ron) | 5 ohm (typ) | 3.5 ohm (typ) | 5 ohm (typ) | 5 ohm (typ) | 5 ohm (typ) | 5 ohm (typ) |
| Propagation Delay | <250 ps | <250 ps | <250 ps | <250 ps | <250 ps | <250 ps |
| Supply Voltage Range | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Operating Temperature Range | -40Β°C to +85Β°C | -40Β°C to +85Β°C | -40Β°C to +85Β°C | -40Β°C to +85Β°C | -40Β°C to +85Β°C | -40Β°C to +85Β°C |
| RoHS Compliant | Yes | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status | EOL | Active | EOL | EOL | Active | Active |
Key Differentiators
- Lower on-state resistance in alternative (vs SN74CBT3245CDWR)
- Same die, different ordering code (vs SN74CBT3245ADWRE4)
- Cross-brand availability (vs 74CBT3245D)
Design Notes
Ensure the OE pin is properly controlled to avoid bus contention. When OE is high, the switch is disabled, providing a high-impedance state. Do not leave OE floating; connect it to a defined logic level. Also, avoid exceeding the supply voltage range of 4.5V to 5.5V to prevent damage.
Place decoupling capacitors (0.1uF) close to the VCC pin to filter high-frequency noise. Use a solid ground plane to minimize inductance and ensure signal integrity. Keep traces short and matched for high-speed signals to reduce reflections.
The SN74CBT3245ADWR is a low-power device, but in high-speed switching applications, ensure adequate airflow or copper area for heat dissipation. The SOIC-20 package has a thermal resistance of approximately 100Β°C/W; for most applications, this is sufficient without additional heatsinking.
Compliance Information
RoHS compliant per TI product page. No AEC-Q100 qualification for this logic device.
