Specifications
| Type | Description |
|---|---|
| Part Number | ISO1640 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | SOIC-8 D package 4.90 mm x 3.91 mm; SOIC-16 DW package 10.30 mm x 7.50 mm |
| I2C Channel Configuration | Bidirectional SDA and SCL communication; condition: ISO1640; source page: 1 |
| Hot-Swappable Bus Pins | SDA and SCL hot-swappable; condition: SDA and SCL lines; source page: 1 |
| Maximum Bidirectional Data Rate | 1.7 MHz; condition: I2C compatible operation; source page: 1 |
| Side 1 Supply Voltage Range | 3 V to 5.5 V; condition: recommended operating supply range; source page: 1 |
| Side 2 Supply Voltage Range | 2.25 V to 5.5 V; condition: recommended operating supply range; source page: 1 |
| Side 1 Open-Drain Sink Current | 3.5 mA; condition: open-drain outputs, Side 1; source page: 1 |
| Side 2 Open-Drain Sink Current | 50 mA; condition: open-drain outputs, Side 2; source page: 1 |
| Side 1 Maximum Capacitive Load | 80 pF; condition: I2C bus Side 1; source page: 1 |
| Side 2 Maximum Capacitive Load | 400 pF; condition: I2C bus Side 2; source page: 1 |
| Operating Temperature Range | -40°C to +125°C; condition: operating free-air temperature; source page: 1 |
| Isolation Rating | 3000 VRMS; condition: ISO164xBD, SOIC-8 D package, UL 1577; source page: 1 |
| Isolation Rating | 5000 VRMS; condition: ISO164xDW, SOIC-16 DW package, UL 1577; source page: 1 |
| Protection Level | Basic; condition: ISO164xBD isolation option; source page: 1 |
| Protection Level | Reinforced; condition: ISO164xDW isolation option; source page: 1 |
| Surge Test Voltage | 6500 VPK; condition: ISO164xBD isolation option; source page: 1 |
| Surge Test Voltage | 10000 VPK; condition: ISO164xDW isolation option; source page: 1 |
| Working Voltage | 450 VRMS / 637 VPK; condition: ISO164xBD isolation option; source page: 1 |
| Working Voltage | 1500 VRMS / 2121 VPK; condition: ISO164xDW isolation option; source page: 1 |
| Common-Mode Transient Immunity | ±100 kV/µs typical; condition: across isolation barrier; source page: 1 |
| IEC ESD Contact Discharge Protection | ±8 kV; condition: IEC 61000-4-2 contact discharge across isolation barrier; source page: 1 |
| Same-Side Unpowered IEC ESD Contact Discharge | ±8 kV; condition: SCL2 and SDA2, Side 2; source page: 1 |
| Absolute Maximum Supply Voltage | -0.5 V to 6 V; condition: VCC1, VCC2 over operating free-air temperature range; source page: 8 |
| Absolute Maximum SDA1/SCL1 Voltage | -0.5 V to VCCX + 0.5 V; condition: input/output voltage, SDA1 and SCL1; source page: 8 |
| Absolute Maximum SDA2/SCL2 Voltage | -0.5 V to VCCX + 0.5 V; condition: input/output voltage, SDA2 and SCL2; source page: 8 |
| Powered-Off Hotswap Bus Pin Voltage | 0 V to 6 V; condition: 0 V < SDAx, SCLx < 6 V during powered-off hotswap; source page: 8 |
| Absolute Maximum SDA1/SCL1 Current | 0 mA to 20 mA; condition: input/output current, SDA1 and SCL1; source page: 8 |
| Absolute Maximum SDA2/SCL2 Current | 0 mA to 100 mA; condition: input/output current, SDA2 and SCL2; source page: 8 |
| Maximum Junction Temperature | 150°C; condition: absolute maximum rating; source page: 8 |
| Storage Temperature Range | -65°C to 150°C; condition: absolute maximum rating; source page: 8 |
| HBM ESD Rating All Pins | ±6000 V; condition: human body model per ANSI/ESDA/JEDEC JS-001; source page: 8 |
| HBM ESD Rating Bus Pins Side 1 | ±10000 V; condition: ISO1640/ISO1641 SDA1 and SCL1 pins; source page: 8 |
| HBM ESD Rating Bus Pins Side 2 | ±14000 V; condition: ISO1640/ISO1641 SDA2 and SCL2 pins; source page: 8 |
| CDM ESD Rating | ±1500 V; condition: charged-device model per ANSI/ESDA/JEDEC JS-002; source page: 8 |
| IEC ESD Isolation Barrier Withstand | ±8000 V; condition: contact discharge per IEC 61000-4-2, isolation barrier withstand test; source page: 8 |
| Datasheet Status | request_only |
Product Overview
ISO1640 is a Texas Instruments bidirectional I2C digital isolator in the Signal_Chain category. It supports bidirectional SDA and SCL communication, with SDA and SCL pins specified as hot-swappable. I2C-compatible operation is specified up to a 1.7 MHz maximum bidirectional data rate.
The device separates Side 1 and Side 2 supply and bus characteristics. Side 1 operates from 3 V to 5.5 V and supports 3.5 mA open-drain sink current with an 80 pF maximum capacitive load. Side 2 operates from 2.25 V to 5.5 V and supports 50 mA open-drain sink current with a 400 pF maximum capacitive load.
Package and isolation options include the SOIC-8 D package at 4.90 mm x 3.91 mm and the SOIC-16 DW package at 10.30 mm x 7.50 mm. The ISO164xBD option provides basic protection with 3000 VRMS isolation, 6500 VPK surge test voltage, and 450 VRMS / 637 VPK working voltage. The ISO164xDW option provides reinforced protection with 5000 VRMS isolation, 10000 VPK surge test voltage, and 1500 VRMS / 2121 VPK working voltage.
Key Features
- Bidirectional SDA and SCL communication for ISO1640
- SDA and SCL bus pins are hot-swappable
- I2C-compatible bidirectional data rate up to 1.7 MHz
- Side 1 supply range is 3 V to 5.5 V
- Side 2 supply range is 2.25 V to 5.5 V
- Side 1 open-drain outputs sink 3.5 mA
- Side 2 open-drain outputs sink 50 mA
- Side 1 supports 80 pF maximum bus capacitance
- Side 2 supports 400 pF maximum bus capacitance
- Operating free-air temperature spans -40°C to +125°C
- SOIC-8 option provides 3000 VRMS basic isolation
- SOIC-16 option provides 5000 VRMS reinforced isolation
Typical Applications
- Isolated I2C SDA and SCL links
- Hot-swappable I2C bus connections
- Side 1 low-capacitance I2C segments
- Side 2 higher-capacitance I2C segments
- Basic isolation I2C interfaces
- Reinforced isolation I2C interfaces
- High-transient-immunity isolation barriers
Procurement Notes
When requesting a quote for ISO1640, 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 ISO1640?
ISO1640 is a Texas Instruments bidirectional I2C digital isolator. It supports bidirectional SDA and SCL communication and is categorized here as a Signal_Chain component.
What data rate does ISO1640 support for I2C operation?
For I2C-compatible operation, ISO1640 supports a maximum bidirectional data rate of 1.7 MHz. This value applies to bidirectional SDA and SCL communication as extracted from the manufacturer technical datasheet.
What supply ranges are specified for each side?
Side 1 has a recommended operating supply range of 3 V to 5.5 V. Side 2 has a recommended operating supply range of 2.25 V to 5.5 V.
Which package and isolation options are listed for ISO1640?
The SOIC-8 D package is listed at 4.90 mm x 3.91 mm with the ISO164xBD basic isolation option rated 3000 VRMS. The SOIC-16 DW package is listed at 10.30 mm x 7.50 mm with the ISO164xDW reinforced isolation option rated 5000 VRMS.
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.