Specifications
| Type | Description |
|---|---|
| Part Number | ISO1540 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | SOIC (8), D package, 4.90 mm × 3.91 mm nominal body size |
| Device Function | Low-power bidirectional I2C-compatible isolator |
| Channel Configuration | Two isolated bidirectional channels for clock and data lines |
| Maximum Operating Frequency | 1 MHz; maximum bus load and maximum current sink |
| Supply Voltage Range | 3 V to 5.5 V; VCC1, VCC2 recommended operating conditions |
| Operating Ambient Temperature | -40°C to +125°C; recommended operating conditions |
| Operating Junction Temperature | -40°C to +136°C; recommended operating conditions |
| Thermal Shutdown Temperature | 139°C to 197°C; recommended operating conditions |
| Transient Immunity | ±50 kV/µs typical |
| Side 1 Output Sink Current Capability | 3.5 mA; open-drain outputs |
| Side 2 Output Sink Current Capability | 35 mA; open-drain outputs |
| Output Current Side 1 | 0.5 mA to 3.5 mA; IOL1 recommended operating conditions |
| Output Current Side 2 | 0.5 mA to 35 mA; IOL2 recommended operating conditions |
| Capacitive Load Side 1 | 40 pF max; C1 recommended operating conditions |
| Capacitive Load Side 2 | 400 pF max; C2 recommended operating conditions |
| Side 1 Low-Level Input Voltage | 0 V to 0.5 V; VIL1 recommended operating conditions |
| Side 1 High-Level Input Voltage | 0.7 × VCC1 to VCC1; VIH1 recommended operating conditions |
| Side 2 Low-Level Input Voltage | 0 V to 0.3 × VCC2; VIL2 recommended operating conditions |
| Side 2 High-Level Input Voltage | 0.7 × VCC2 to VCC2; VIH2 recommended operating conditions |
| Side 1 Signal Voltage Range | 0 V to VCC1; VSDA1, VSCL1 input and output signal voltages |
| Side 2 Signal Voltage Range | 0 V to VCC2; VSDA2, VSCL2 input and output signal voltages |
| Absolute Maximum Supply Voltage | -0.5 V to 6 V; VCC1, VCC2 absolute maximum ratings |
| Absolute Maximum Side 1 Signal Voltage | -0.5 V to VCC1 + 0.5 V, not exceeding 6 V; SDA1, SCL1 absolute maximum ratings |
| Absolute Maximum Side 2 Signal Voltage | -0.5 V to VCC2 + 0.5 V, not exceeding 6 V; SDA2, SCL2 absolute maximum ratings |
| Absolute Maximum Side 1 Output Current | 0 mA to 20 mA; SDA1, SCL1 absolute maximum ratings |
| Absolute Maximum Side 2 Output Current | 0 mA to 100 mA; SDA2, SCL2 absolute maximum ratings |
| Maximum Junction Temperature | 150°C; absolute maximum rating |
| Storage Temperature | -65°C to +150°C; absolute maximum rating |
| HBM ESD Protection Bus Pins | ±8000 V; human body model per ANSI/ESDA/JEDEC JS-001 |
| HBM ESD Protection All Pins | ±4000 V; human body model per ANSI/ESDA/JEDEC JS-001 |
| CDM ESD Protection | ±1500 V; charged-device model per JEDEC JESD22-C101 |
| Isolation Rating | 4242 VPK; DIN EN IEC 60747-17 / VDE 0884-17 safety certification |
| UL Isolation Rating | 2500 VRMS for 1 minute; UL 1577 safety certification |
| Isolation Barrier Material | Silicon dioxide capacitive isolation barrier |
| SDA1 Pin | Pin 2, input/output; serial data input/output, side 1, ISO1540 |
| SDA2 Pin | Pin 7, input/output; serial data input/output, side 2, ISO1540 |
| SCL1 Pin | Pin 3, input/output; serial clock input/output, side 1, ISO1540 |
| SCL2 Pin | Pin 6, input/output; serial clock input/output, side 2, ISO1540 |
| VCC1 Pin | Pin 1; supply voltage, side 1 |
| VCC2 Pin | Pin 8; supply voltage, side 2 |
| GND1 Pin | Pin 4; ground, side 1 |
| GND2 Pin | Pin 5; ground, side 2 |
| Datasheet Status | request_only |
Product Overview
The ISO1540 is a Texas Instruments low-power bidirectional I2C-compatible isolator for Signal_Chain designs. It provides two isolated bidirectional channels assigned to serial data and serial clock, allowing the SDA and SCL lines to cross an isolation barrier while maintaining side-specific signal ranges from 0 V to VCC1 and 0 V to VCC2.
The device operates from 3 V to 5.5 V supplies on both VCC1 and VCC2 and supports operation up to 1 MHz under the stated maximum bus load and current sink condition. Side 1 open-drain outputs support 3.5 mA sink capability, while side 2 supports 35 mA. Recommended capacitive loading is 40 pF maximum on side 1 and 400 pF maximum on side 2.
The package is an SOIC (8) D package with a 4.90 mm × 3.91 mm nominal body size. Pin functions include VCC1 on pin 1, SDA1 on pin 2, SCL1 on pin 3, GND1 on pin 4, GND2 on pin 5, SCL2 on pin 6, SDA2 on pin 7, and VCC2 on pin 8.
Key Features
- Low-power bidirectional I2C-compatible isolator
- Two isolated bidirectional clock and data channels
- Supports operation up to 1 MHz
- 3 V to 5.5 V VCC1 and VCC2 supplies
- -40°C to +125°C operating ambient range
- ±50 kV/µs typical transient immunity
- Side 1 open-drain sink capability of 3.5 mA
- Side 2 open-drain sink capability of 35 mA
- Silicon dioxide capacitive isolation barrier
- 4242 VPK isolation certification rating
- 2500 VRMS UL isolation for 1 minute
- SOIC-8 D package with 4.90 mm × 3.91 mm body
Typical Applications
- Isolated I2C clock lines
- Isolated I2C data lines
- Bidirectional SDA and SCL isolation
- 3 V to 5.5 V I2C interfaces
- High-capacitance side 2 buses
- High-temperature I2C-compatible interfaces
Procurement Notes
When requesting a quote for ISO1540, 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 ISO1540?
The ISO1540 is a Texas Instruments low-power bidirectional I2C-compatible isolator. It provides two isolated bidirectional channels for the serial clock and serial data lines.
What supply voltage range does the ISO1540 support?
The recommended operating supply range for both VCC1 and VCC2 is 3 V to 5.5 V. The absolute maximum supply voltage rating is -0.5 V to 6 V.
What package is specified for the ISO1540?
The ISO1540 is specified in an SOIC (8), D package with a 4.90 mm × 3.91 mm nominal body size. The device includes separate side 1 and side 2 supply and ground pins.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 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.