74CBT1G125DCKR Texas Instruments Integrated Circuit (SOT23 (5-Pin)) In Stock
Texas Instruments 74CBT1G125DCKR is a single-channel bus switch with 3-state output and 5-pin SC-70 package supporting 2.3 V to 3.6 V supplies. Features near-zero propagation delay under 0.25 ns and 5 Ω on-resistance for transparent signal switching. Available in stock from major distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- 74CBT1G125DCKR Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of 74CBT1G125DCKR?
- Near-zero propagation delay of less than 0.25 ns enables transparent pass-through switching without timing penalty in high-speed data buses
- 5 Ω flat on-resistance over 2.3 V to 3.6 V supply range allows direct signal level pass-through without voltage shift or waveform degradation
- Tiny 5-pin SC-70 package (2.0 mm x 2.1 mm) minimizes board footprint in portable and space-constrained designs such as smartphones and wearables
What is 74CBT1G125DCKR used for?
The 74CBT1G125DCKR is ideal for isolating or multiplexing single data, clock, or control signals on 3.3 V digital buses in microcontroller, FPGA, and SoC platforms. Its near-zero propagation delay makes it suitable for connecting or disconnecting signals in USB, I2C, and SPI bus segments where timing integrity is critical. The compact SC-70 package fits easily into portable consumer electronics, handheld instruments, and battery-operated IoT nodes requiring minimal area per switched signal.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the 74CBT1G125DCKR datasheet?
74CBT1G125DCKR Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for 74CBT1G125DCKR?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the on-resistance of the 74CBT1G125DCKR, and how does it affect signal integrity on a 3.3 V I2C bus?
The 74CBT1G125DCKR has a typical on-resistance of approximately 5 Ω over the 2.3 V to 3.6 V supply range. On a 3.3 V I2C bus with a 4.7 kΩ pull-up resistor, this 5 Ω switch resistance contributes less than 0.1% to the total bus impedance, causing negligible voltage drop and no measurable degradation to rising-edge timing at standard 400 kHz Fast-mode I2C speeds.
In what scenarios should a designer use the 74CBT1G125DCKR to protect a microcontroller GPIO during peripheral power sequencing?
During power sequencing, if a peripheral is unpowered while the microcontroller GPIO is driven high, direct connection can cause latch-up or current leakage through the peripheral's ESD diodes. Inserting the 74CBT1G125DCKR with OE held low (disabled) isolates the GPIO from the unpowered peripheral. The switch's 5 Ω on-resistance and 2.3 V minimum supply ensure it remains transparent once both rails are active, without requiring an extra level-shifter.
What supply voltage range and package does the 74CBT1G125DCKR support for use in 3.3 V portable designs?
The 74CBT1G125DCKR operates from 2.3 V to 3.6 V, directly compatible with 3.3 V systems and LDO-regulated 2.5 V rails. It is housed in a 5-pin SC-70 package measuring 2.0 mm x 2.1 mm with 0.65 mm pin pitch, making it one of the smallest single-channel bus switches available. This footprint suits handheld consumer devices, smartwatch boards, and PCB areas with tight routing constraints.
How does the 74CBT1G125DCKR compare to a standard logic buffer for multiplexing a single SPI clock line between two devices?
Unlike a logic buffer, the 74CBT1G125DCKR passes signals bi-directionally with under 0.25 ns propagation delay, preserving both edges without introducing asymmetric delay skew. A buffer adds unidirectional 3 ns to 5 ns delay and cannot pass signals in reverse. For SPI clock multiplexing at up to 40 MHz, the bus switch's transparent pass-through with 5 Ω resistance better preserves edge integrity compared to a buffered approach that would require two separate directional components.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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