SN74LVC1T45DCKR - Single-Bit Level Translator | Texas Instruments
MPN: SN74LVC1T45DCKR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.38 | $3.80 |
| 100 | $0.29 | $29.00 |
| 500 | $0.23 | $115.00 |
| 1,000 | $0.18 | $180.00 |
| 3,000 | $0.16 | $480.00 |
Drop-in alternatives for SN74LVC1T45DCKR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SN74LVC1T45DCKT
✅ Drop-In📋 Reference alternative (not in catalog)
SN74AVC1T45DCKR
✅ Drop-In📋 Reference alternative (not in catalog)
SN74LVC1T45DCKR Maximum Ratings & Electrical Characteristics
| Technology | CMOS |
| Device Type | Line / Bus Driver |
| Supply Voltage (VCCA) | 1.65 V to 5.5 V |
| Supply Voltage (VCCB) | 1.65 V to 5.5 V |
| Data Rate | 420 Mbps |
| Propagation Delay (tpd) | 3.3 ns at 3.3 V |
| Maximum ICC | 10 µA |
| Output Drive | ±24 mA at 3.3 V |
| Input Voltage Tolerance | 5.5 V max |
| ESD Protection | 2000-V HBM (JESD 22 A114-A) |
| Operating Temperature | -40°C to +125°C |
| Package | SC-70-6 (DCK) |
| Mounting Type | Surface Mount |
| Number of Channels | 1 |
| Direction Control | Yes (DIR pin) |
| Output Enable | Yes (active high) |
| Ioff Protection | Yes |
| Qualified for Automotive | Yes |
SN74LVC1T45DCKR Pin Configuration
| Pin 1 | VCCA — Supply voltage for A port |
| Pin 2 | A — Data input/output for A port |
| Pin 3 | GND — Ground |
| Pin 4 | B — Data input/output for B port |
| Pin 5 | DIR — Direction control: high = A to B, low = B to A |
| Pin 6 | VCCB — Supply voltage for B port |
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
SN74LVC1T45DCKR is suitable for 6 applications: I2C Bus Level Shifting, SPI Level Shifting, Microcontroller to Sensor Interfacing, Memory Card Interface, Automotive Electronics, Portable and Battery-Powered Devices.
I2C Bus Level Shifting
The SN74LVC1T45DCKR is ideal for I2C bus level shifting between different voltage domains, such as 3.3V and 5V. Its bidirectional capability and high data rate (420 Mbps) far exceed I2C's requirements, ensuring reliable communication. The dual-supply design allows each bus side to operate at its native voltage, preventing damage to low-voltage devices. The small SC-70 package fits space-constrained designs, and the DIR pin can be tied high or low for unidirectional use if needed. Proper pull-up resistors on both sides are recommended for I2C compliance.
Recommended
SPI Level Shifting
The SN74LVC1T45DCKR supports SPI level shifting with data rates up to 420 Mbps, covering all standard SPI modes. It translates between different voltage domains, such as 1.8V and 3.3V, ensuring proper logic levels for SPI peripherals. The bidirectional capability allows it to handle MOSI and MISO lines, while the DIR pin can be controlled by the SPI master. The low propagation delay (3.3 ns) minimizes signal skew, and the 3-state outputs enable bus sharing. For multi-slave SPI, multiple devices can be used with separate chip selects.
Recommended
Microcontroller to Sensor Interfacing
The SN74LVC1T45DCKR enables communication between microcontrollers and sensors operating at different voltage levels. For example, a 1.8V MCU can interface with a 3.3V sensor, ensuring signal integrity and preventing damage. The device's low power consumption (10 µA max ICC) is ideal for battery-powered sensor nodes. The bidirectional data flow simplifies wiring, and the small package fits compact designs. The wide operating temperature range (-40°C to +125°C) makes it suitable for industrial sensors. Proper decoupling on both supply rails is recommended.
Recommended
Memory Card Interface
The SN74LVC1T45DCKR is used in memory card interfaces, such as SD and microSD cards, to translate between the host controller voltage and the card voltage. It supports high data rates required for SD card communication, and the bidirectional capability handles command and data lines. The dual-supply design ensures proper logic levels for both sides, and the 3-state outputs allow multiple cards to share a bus. The small package is ideal for portable devices. The device's ESD protection (2000-V HBM) provides robustness in harsh environments.
Recommended
Automotive Electronics
The SN74LVC1T45DCKR is qualified for automotive applications, making it suitable for level shifting in vehicle electronics. It operates over the full automotive temperature range (-40°C to +125°C) and supports 5V VCC operation, which is common in automotive systems. The device can interface between different voltage domains, such as 3.3V and 5V, in ECUs, sensors, and infotainment systems. Its high ESD protection (2000-V HBM) ensures reliability in harsh automotive environments. The small package is ideal for space-constrained modules.
Recommended
Portable and Battery-Powered Devices
The SN74LVC1T45DCKR is ideal for portable and battery-powered devices due to its low power consumption (10 µA max ICC) and small package. It enables level shifting between different voltage domains, such as 1.8V and 3.3V, in smartphones, wearables, and IoT devices. The device supports high data rates for fast communication, and the Ioff feature prevents backflow current during power-down, extending battery life. The wide operating temperature range ensures reliable operation in various environments. Proper power management is essential to maximize battery life.
Recommended
Recommended Products Summary
Engineering reference data for SN74LVC1T45DCKR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LVC1T45DCKT | SN74LVC1T45DPKR | SN74AVC1T45DCKR |
|---|---|---|---|---|
| Package | SC-70-6 (DCK) | SC-70-6 (DCK) - same | SOT-23-6 (DPK) | SC-70-6 (DCK) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage Range | 1.65V to 5.5V | 1.65V to 5.5V | 1.65V to 5.5V | 0.9V to 3.6V |
| Data Rate | 420 Mbps | 420 Mbps | 420 Mbps | 320 Mbps |
| Propagation Delay | 3.3 ns at 3.3V | 3.3 ns at 3.3V | 3.3 ns at 3.3V | 2.5 ns at 3.3V |
| Output Drive | ±24 mA at 3.3V | ±24 mA at 3.3V | ±24 mA at 3.3V | ±12 mA at 3.3V |
| ESD Protection | 2000-V HBM | 2000-V HBM | 2000-V HBM | 2000-V HBM |
| Automotive Qualified | Yes | Yes | Yes | No |
Key Differentiators
- Higher data rate than many competitors (vs SN74AVC1T45DCKR)
- Wider supply voltage range (vs SN74AVC1T45DCKR)
- Automotive qualified (vs SN74AVC1T45DCKR)
Design Notes
Ensure both VCCA and VCCB are powered and within their specified ranges (1.65V to 5.5V). The device does not have a power-down mode, so both supplies must be present for proper operation. Use decoupling capacitors (0.1 µF) close to each supply pin to minimize noise and ensure stable operation.
Place the SN74LVC1T45DCKR close to the interface connector or the low-voltage device to minimize trace length and reduce signal integrity issues. Keep the traces for A and B ports short and avoid routing them near high-speed switching signals. Use ground planes to provide a low-impedance return path.
Do not leave the DIR or OE pins floating. Drive them to valid logic levels to avoid bus contention and excessive current draw. When using the device for bidirectional communication, ensure the DIR signal is properly synchronized to avoid data corruption. Also, avoid exceeding the maximum input voltage of 5.5V on any pin.
Compliance Information
Qualified for automotive applications per TI product page. RoHS and REACH compliant.
