10pcs ISO1540D SOIC-8 2.5kVrms Bidirectional I2C Isolator IC
10pcs ISO1540D SOIC-8 2.5kVrms Bidirectional I2C Isolator IC
ISO1540D / ISO1540DR – 2.5kVrms Bidirectional I²C Isolator (Pack of 10)
Get reliable galvanic isolation for your I²C bus with this pack of 10 × ISO1540D / ISO1540DR ICs in the compact SOIC-8 package. Designed for engineers, makers, and electronics hobbyists who need robust two-way communication across an isolation barrier, these chips deliver up to 2,500 Vrms of isolation voltage, protecting sensitive microcontrollers and sensors from high-voltage transients and ground-loop interference.
Made in Mainland China.
Key Features
- Bidirectional I²C isolation – fully transparent SCL and SDA lines in both directions; no extra logic required
- 2.5 kVrms isolation voltage – robust galvanic barrier suitable for industrial and general-purpose designs
- SOIC-8 package (ISO1540D / ISO1540DR) – easy to solder, compatible with standard PCB footprints
- Supports I²C clock frequencies up to 1 MHz (Fast Mode Plus)
- Low propagation delay – maintains signal integrity for time-sensitive I²C transactions
- Wide supply voltage range – works with both 3.3 V and 5 V systems on either side of the isolation barrier
- General-purpose use – suitable for industrial automation, sensor isolation, medical instrumentation prototyping, motor drives, and more
- Pack of 10 – ideal for prototyping runs, small batch production, or stocking your component drawer
Specifications
| Model | ISO1540D / ISO1540DR |
| Package | SOIC-8 |
| Isolation Voltage | 2,500 Vrms |
| Interface | Bidirectional I²C (SCL + SDA) |
| Max Clock Frequency | 1 MHz (FM+) |
| Supply Voltage | 3.3 V / 5 V compatible |
| Quantity | 10 pieces per order |
| Origin | Mainland China |
Who Is This For?
Whether you're designing an industrial PLC interface, isolating a sensor from a noisy power bus, or building a prototype that demands electrically separated I²C segments, the ISO1540D delivers a drop-in, no-fuss solution. Its standard SOIC-8 footprint makes it straightforward to incorporate into new or existing PCB layouts.
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Frequently Asked Questions
Q: What is the ISO1540D used for in electronic circuits?
A: The ISO1540D is a bidirectional I²C isolator IC. It creates a galvanic isolation barrier between two sections of an I²C bus, preventing high-voltage transients, ground loops, and noise from one side of the circuit from damaging or disrupting components on the other side. It is commonly used in industrial automation, motor control, sensor interfaces, and any design where the I²C master and slave operate on different ground potentials.
Q: Is the ISO1540D compatible with both 3.3 V and 5 V microcontrollers?
A: Yes. The ISO1540D supports mixed-voltage designs, allowing one side to operate at 3.3 V and the other at 5 V, making it versatile for connecting modern low-voltage microcontrollers to legacy 5 V peripherals or vice versa.
Q: What is the difference between ISO1540D and ISO1540DR?
A: The ISO1540D is the standard SOIC-8 variant, while the ISO1540DR is the tape-and-reel packaged version of the same chip — both are electrically identical. This pack includes both markings (D and DR), so you receive genuine compatible parts regardless of the suffix on the label.
Q: How many ICs are included in one order?
A: Each order includes 10 pieces of the ISO1540D / ISO1540DR in SOIC-8 packaging, making it ideal for prototyping, small production runs, or replenishing your component stock.