Specifications
| Type | Description |
|---|---|
| Part Number | ISO1541 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Interface compatibility | I2C compatible; isolated bidirectional communication |
| Maximum operating frequency | 1 MHz at maximum bus load and maximum current sink |
| Supply voltage range | 3 V to 5.5 V, recommended operating conditions for VCC1 and VCC2 |
| Output type | Open-drain outputs on SDA and SCL bus pins |
| Side 1 sink current capability | 3.5 mA, open-drain output side 1 |
| Side 2 sink current capability | 35 mA, open-drain output side 2 |
| Operating ambient temperature | -40°C to +125°C, recommended operating conditions |
| Typical transient immunity | ±50 kV/µs common-mode transient immunity |
| HBM ESD protection, all pins | ±4000 V, human body model per ANSI/ESDA/JEDEC JS-001 |
| HBM ESD protection, bus pins | ±8000 V, human body model per ANSI/ESDA/JEDEC JS-001 |
| CDM ESD protection | ±1500 V, charged-device model per JEDEC JESD22-C101 |
| Isolation rating, VDE | 4242 VPK per DIN EN IEC 60747-17 / VDE 0884-17 |
| Isolation rating, UL | 2500 VRMS for 1 minute per UL 1577 |
| Isolation barrier material | Silicon dioxide, SiO2, Texas Instruments capacitive isolation technology |
| ISO1540 channel configuration | Two isolated bidirectional channels for clock and data lines |
| ISO1541 channel configuration | Bidirectional data channel and unidirectional clock channel for single-controller applications |
| Clock stretching support guidance | Use ISO1540 where clock stretching by the target is possible |
| Package pin count | 8 pins, SOIC D package |
| Package case | SOIC (8), D package, 4.90 mm × 3.91 mm nominal body size |
| VCC1 absolute maximum voltage | -0.5 V to 6 V with respect to local ground, peak voltage |
| VCC2 absolute maximum voltage | -0.5 V to 6 V with respect to local ground, peak voltage |
| SDA1 and SCL1 absolute maximum voltage | -0.5 V to VCC1 + 0.5 V, not exceeding 6 V, with respect to GND1 |
| SDA2 and SCL2 absolute maximum voltage | -0.5 V to VCC2 + 0.5 V, not exceeding 6 V, with respect to GND2 |
| Side 1 absolute maximum output current | 0 mA to 20 mA on SDA1 and SCL1 |
| Side 2 absolute maximum output current | 0 mA to 100 mA on SDA2 and SCL2 |
| Maximum junction temperature | 150°C, absolute maximum rating |
| Storage temperature | -65°C to 150°C, absolute maximum rating |
| Side 1 input/output signal voltage | 0 V to VCC1, recommended VSDA1 and VSCL1 |
| Side 2 input/output signal voltage | 0 V to VCC2, recommended VSDA2 and VSCL2 |
| Side 1 low-level input voltage | 0 V to 0.5 V, recommended VIL1 |
| Side 1 high-level input voltage | 0.7 × VCC1 to VCC1, recommended VIH1 |
| Side 2 low-level input voltage | 0 V to 0.3 × VCC2, recommended VIL2 |
| Side 2 high-level input voltage | 0.7 × VCC2 to VCC2, recommended VIH2 |
| Side 1 output current | 0.5 mA to 3.5 mA, recommended IOL1 |
| Side 2 output current | 0.5 mA to 35 mA, recommended IOL2 |
| Side 1 capacitive load | 40 pF, recommended C1 |
| Side 2 capacitive load | 400 pF, recommended C2 |
| Junction temperature operating range | -40°C to 136°C, recommended operating conditions |
| Thermal shutdown temperature | 139°C to 197°C, recommended TSD |
| ISO1540 SCL1 pin function | Serial clock input/output, side 1, pin 3 |
| ISO1540 SCL2 pin function | Serial clock input/output, side 2, pin 6 |
| ISO1541 SCL1 pin function | Serial clock input, side 1, pin 3 |
| ISO1541 SCL2 pin function | Serial clock output, side 2, pin 6 |
| Datasheet Status | request_only |
Product Overview
The ISO1541 is a Texas Instruments bidirectional I2C digital isolator for isolated communication across I2C clock and data lines. For ISO1541, the data channel is bidirectional while the clock channel is unidirectional, with SCL1 defined as the serial clock input on side 1 and SCL2 defined as the serial clock output on side 2. The datasheet guidance specifies ISO1540 instead where target-side clock stretching is possible.
The device operates from 3 V to 5.5 V supplies on VCC1 and VCC2 and supports operation up to 1 MHz at maximum bus load and maximum current sink. SDA and SCL bus pins use open-drain outputs, with side 1 sink capability of 3.5 mA and side 2 sink capability of 35 mA. Recommended capacitive loads are 40 pF on side 1 and 400 pF on side 2.
Isolation is implemented with Texas Instruments capacitive isolation technology using a silicon dioxide barrier. Ratings include 4242 VPK per DIN EN IEC 60747-17 / VDE 0884-17 and 2500 VRMS for 1 minute per UL 1577. The 8-pin SOIC D package has a 4.90 mm × 3.91 mm nominal body size and is specified for -40°C to +125°C ambient operation.
Key Features
- I2C-compatible isolated bidirectional communication
- Maximum 1 MHz operating frequency
- 3 V to 5.5 V VCC1 and VCC2 range
- Open-drain SDA and SCL bus outputs
- 3.5 mA side 1 sink current capability
- 35 mA side 2 sink current capability
- ±50 kV/µs typical common-mode transient immunity
- 4242 VPK VDE isolation rating
- 2500 VRMS UL 1577 isolation rating
- Silicon dioxide capacitive isolation barrier
- 8-pin SOIC D package
Typical Applications
- Isolated I2C communication
- Single-controller I2C isolation
- Isolated clock and data lines
- Open-drain SDA and SCL buses
- Systems requiring side 1 and side 2 isolation
- Applications without target clock stretching
Procurement Notes
When requesting a quote for ISO1541, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What type of device is the ISO1541?
The ISO1541 is a Texas Instruments bidirectional I2C digital isolator. It provides a bidirectional data channel and a unidirectional clock channel for isolated single-controller I2C communication.
What supply voltage range does ISO1541 support?
The recommended operating supply voltage range is 3 V to 5.5 V for both VCC1 and VCC2. Input and output signal voltages are referenced to the corresponding side supply rails.
Does ISO1541 support target-side clock stretching?
The extracted datasheet guidance says to use ISO1540 in applications where clock stretching by the target is possible. ISO1541 uses a bidirectional data channel and a unidirectional clock channel.
What isolation ratings are specified for ISO1541?
The extracted facts list 4242 VPK isolation per DIN EN IEC 60747-17 / VDE 0884-17 and 2500 VRMS for 1 minute per UL 1577. The isolation barrier material is silicon dioxide.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 20, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.