LSF0108PWR - 8-Ch Bidirectional Level Translator | TI
MPN: LSF0108PWR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.38 | $3.80 |
| 100 | $0.3 | $30.00 |
| 500 | $0.25 | $125.00 |
| 1,000 | $0.2 | $200.00 |
Drop-in alternatives for LSF0108PWR — 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:
LSF0108QPWRQ1
✅ Drop-In✓ In Stock
$0.67 / Unit
View Datasheet →TXB0108PWR
✅ Drop-In✓ In Stock
$0.62 / Unit
View Datasheet →SN74LVC8T245PWR
✅ Drop-In✓ In Stock
$0.6 / Unit
View Datasheet →LSF0108PW-Q100J
✅ Drop-In📋 Reference alternative (not in catalog)
LSF0108QPWRQ1
✅ Drop-In✓ In Stock
$0.67 / Unit
View Datasheet →LSF0108PWR Maximum Ratings & Electrical Characteristics
| Number of Channels | 8 |
| Number of Circuits | 1 |
| Direction | Bidirectional |
| Voltage - VCCA | 0 V to 5 V |
| Voltage - VCCB | 0 V to 5 V |
| Propagation Delay | 1.5 ns |
| Output Type | Open Drain, Push-Pull |
| Operating Temperature | -40°C to 125°C |
| Package / Case | 20-TSSOP |
| Mounting Type | Surface Mount |
| Supplier Device Package | 20-TSSOP |
| RoHS Status | Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Input/Output Voltage | 0 V to 5 V |
| Number of Pins | 20 |
LSF0108PWR Pin Configuration
| Pin 1 | A1 — A-side channel 1 |
| Pin 2 | A2 — A-side channel 2 |
| Pin 3 | A3 — A-side channel 3 |
| Pin 4 | A4 — A-side channel 4 |
| Pin 5 | A5 — A-side channel 5 |
| Pin 6 | A6 — A-side channel 6 |
| Pin 7 | A7 — A-side channel 7 |
| Pin 8 | A8 — A-side channel 8 |
| Pin 9 | GND — Ground |
| Pin 10 | VREF_A — Reference voltage for A-side |
| Pin 11 | VREF_B — Reference voltage for B-side |
| Pin 12 | B8 — B-side channel 8 |
| Pin 13 | B7 — B-side channel 7 |
| Pin 14 | B6 — B-side channel 6 |
| Pin 15 | B5 — B-side channel 5 |
| Pin 16 | B4 — B-side channel 4 |
| Pin 17 | B3 — B-side channel 3 |
| Pin 18 | B2 — B-side channel 2 |
| Pin 19 | B1 — B-side channel 1 |
| Pin 20 | EN — Enable (active high) |
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
LSF0108PWR is suitable for 6 applications: I2C Bus Level Shifting, UART Interfacing, SPI Level Shifting, Sensor Interfacing, Industrial Control Systems, Consumer Electronics.
I2C Bus Level Shifting
The LSF0108PWR is ideal for I2C bus level shifting between different voltage domains, such as 1.8V to 3.3V or 5V. Its auto-bidirectional capability and open-drain support ensure proper communication without direction control. With 8 channels, it can handle multiple I2C lines simultaneously. The 1.5ns propagation delay maintains signal integrity at standard and fast-mode speeds. External pull-up resistors are required, which can be sized to meet rise-time specifications. This makes it a reliable solution for mixed-voltage systems.
Recommended
UART Interfacing
The LSF0108PWR can translate UART signals between microcontrollers and peripherals operating at different voltages, such as 3.3V and 5V. Its bidirectional capability allows both TX and RX lines to be shifted with a single device. The push-pull support ensures compatibility with standard UART drivers. The wide voltage range (0V to 5V) covers common logic levels. The 8 channels provide ample capacity for multiple UARTs or additional control signals. This simplifies PCB design by reducing the need for multiple translators.
Recommended
SPI Level Shifting
The LSF0108PWR can shift SPI signals between different voltage domains, enabling communication between 3.3V microcontrollers and 5V peripherals. Its push-pull support is suitable for SPI's push-pull drivers. The 1.5ns propagation delay supports SPI clock rates up to several MHz. The 8 channels can accommodate MOSI, MISO, SCK, and multiple chip-select lines. External pull-ups are not required for push-pull signals, simplifying the design. This makes it a versatile solution for mixed-voltage SPI buses.
Recommended
Sensor Interfacing
The LSF0108PWR is used to interface sensors operating at different voltage levels, such as 1.8V sensors with 3.3V microcontrollers. Its bidirectional capability allows both data and control signals to be translated. The open-drain support is useful for sensors with open-drain outputs. The wide voltage range accommodates various sensor supply voltages. The 8 channels can handle multiple sensor signals, reducing component count. This ensures reliable communication in multi-voltage sensor networks.
Recommended
Industrial Control Systems
In industrial control systems, the LSF0108PWR translates signals between different logic levels, such as 24V I/O and 3.3V logic. Its wide voltage range and bidirectional capability make it suitable for various fieldbus interfaces. The device's robustness over -40°C to 125°C ensures operation in harsh environments. The 8 channels can handle multiple control signals, simplifying wiring. This enhances system reliability by ensuring proper signal levels between different subsystems.
Recommended
Consumer Electronics
The LSF0108PWR is used in consumer electronics to interface between different voltage domains, such as 1.8V application processors and 3.3V peripherals. Its small TSSOP package is ideal for space-constrained designs. The auto-bidirectional feature simplifies firmware and hardware design. The low propagation delay supports high-speed interfaces like SDIO. The 8 channels provide flexibility for multiple interfaces. This makes it a popular choice for smartphones, tablets, and wearables.
Recommended
Recommended Products Summary
Engineering reference data for LSF0108PWR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LSF0108QPWRQ1 | TXB0108PWR | SN74LVC8T245PWR | LSF0108PW-Q100J | LSF0108 |
|---|---|---|---|---|---|---|
| Package | 20-TSSOP | 20-TSSOP | 20-TSSOP | 20-TSSOP | 20-TSSOP | 20-TSSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Nexperia | Diodes Incorporated |
| Number of Channels | 8 | 8 | 8 | 8 | 8 | 8 |
| Direction | Bidirectional | Bidirectional | Bidirectional | Direction-controlled | Bidirectional | Bidirectional |
| Voltage Range | 0 V to 5 V | 0 V to 5 V | 1.2 V to 3.6 V | 1.65 V to 5.5 V | 0 V to 5 V | 0 V to 5 V |
| Propagation Delay | 1.5 ns | 1.5 ns | 1.5 ns | 1.5 ns | 1.5 ns | 1.5 ns |
| Output Type | Open Drain, Push-Pull | Open Drain, Push-Pull | Push-Pull | Push-Pull | Open Drain, Push-Pull | Open Drain, Push-Pull |
| Automotive Grade | No | Yes (AEC-Q100) | No | No | Yes (AEC-Q100) | No |
Key Differentiators
- Auto-bidirectional without direction pin (vs SN74LVC8T245PWR)
- Supports open-drain and push-pull (vs TXB0108PWR)
- Wide voltage range 0V to 5V (vs TXB0108PWR)
Design Notes
For the LSF0108PWR, place external pull-up resistors on both A and B sides, connected to VREF_A and VREF_B respectively. The resistor values should be chosen based on bus capacitance and speed. For I2C at 400 kHz, typical values are 2.2kΩ to 10kΩ. Keep traces short and use ground planes to minimize noise.
The LSF0108PWR requires VREF_A and VREF_B to be connected to the respective voltage rails. Ensure these rails are stable and within the 0V to 5V range. The device does not require a separate power supply, as it uses the reference voltages for level shifting. Bypass capacitors on VREF pins are recommended for noise reduction.
Do not leave the EN pin floating; tie it high to enable the device. For open-drain applications, ensure pull-up resistors are present on both sides. Avoid exceeding the absolute maximum ratings of 5V on any pin. Also, note that the LSF0108PWR is not suitable for level shifting signals with very high speeds above 100 MHz; for such applications, consider dedicated translators.
Compliance Information
RoHS compliant per TI product page. Automotive grade available in LSF0108QPWRQ1.
