ISO1640DWR - 5kVrms Bidirectional I2C Isolator | Texas Instruments
Teilenummer: ISO1640DWR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.08 | $3,08 |
| 10 | $2.92 | $29,20 |
| 100 | $2.68 | $268,00 |
| 500 | $2.45 | $1.225,00 |
| 1.000 | $2.21 | $2.210,00 |
ISO1640DWR Übersicht
A digital isolator is a semiconductor device that transfers digital signals across an isolation barrier separating two ground domains, preventing high voltages or fault currents from propagating between them. Within the power-management and interface-IC hierarchy, the ISO1640 belongs to the digital isolator family, specifically the isolated-protocol-interface subtype that natively understands a communication bus, here the two-wire I2C (Inter-Integrated Circuit) bus used by sensors, EEPROMs, and controllers.
Key features include bidirectional I2C communication on the SCL and SDA lines without direction-control signals, hot-swap capability that keeps both bus sides powered down until a valid connection is established, and enhanced EMC performance suited to electrically noisy industrial environments. The open-drain outputs on each side allow direct connection to a shared I2C bus with external pull-up resistors, matching standard I2C electrical conventions.
Technically, each isolation channel consists of a logic input and an open-drain output separated by a high-voltage isolation barrier implemented in TI's capacitive isolation technology, which supports the 50 kV/us CMTI rating. The low-emissions design minimizes radiated and conducted interference generated by the isolator itself, an important differentiator in EMC-sensitive systems. GPIO channels available on the ISO1640 variant allow two additional isolated general-purpose signals.
Typical applications include isolated I2C links to battery management systems, isolating PMBus/SMBus rails in industrial power supplies, and protecting microcontrollers from ground loops in factory automation and test equipment.
A key design consideration is sizing the pull-up resistors: with 1.7 Mbps support, keep bus capacitance low and choose pull-ups that meet the I2C rise-time spec at your operating frequency; the 8-pin ISO164x variants carry a lower 3000 VRMS rating, so package choice determines the isolation grade.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, adding comparison and sourcing value beyond the raw TI documentation.
Drop-in-Alternativen für ISO1640DWR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ISO1640DWR (gleiche Bauform und Footprint) – abweichend in Isolation Rating (UL 1577), Isolation Type, Output Type.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ISO1641DWR
✅ Drop-In✓ Auf Lager
$2.22 / Stück
Datenblatt ansehen →ISO1640DWR Technische Daten
| Isolation Type | Bidirectional I2C digital isolator |
| Number of Channels | 2 |
| Isolation Rating (UL 1577) | 5000 VRMS |
| Datenrate | 1.7 Mbps |
| CMTI (Common-Mode Transient Immunity) | 50 kV/us |
| Gehäuse | 16-SOIC (DW), 7.50 mm width |
| Hot-Swap Capability | Yes |
| Ausgangstyp | Open-drain |
| GPIO Channels | Yes (ISO1640 variant) |
| Emissions Class | Low emissions, enhanced EMC |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Compliance | UL 1577 isolation rating |
ISO1640DWR 16-soic (dw), 7.50 mm width Pinbelegungsleitfaden
Pinbelegung für ISO1640DWR (16-soic (dw), 7.50 mm width-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für ISO1640DWR.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
ISO1640DWR ist geeignet für 6 Anwendungs: Battery Management Systems (BMS), Isolated PMBus / SMBus Power Supplies, Industrial PLC and Factory Automation, Medical Equipment Isolation, Test and Measurement Equipment, Grid Infrastructure and Solar Inverters.
Battery Management Systems (BMS)
The ISO1640DWR is widely used to isolate the I2C communication bus between a battery pack's cell-monitoring circuitry and the host system controller. Its 5000 VRMS UL 1577 rating withstands the high pack-to-chassis potentials present in high-voltage EV and energy-storage stacks, while the 50 kV/us CMTI tolerates transients from contactor switching and power-converter switching noise. The hot-swap feature is particularly valuable: battery packs are routinely connected and disconnected on live system buses, and the ISO1640 prevents corrupt transactions and back-powering during insertion. Open-drain outputs let the isolated bus share a single SDA/SCL pair with multiple pack-side peripherals. Place the device near the pack connector with 4.7 kOhm pull-ups and short traces to limit bus capacitance.
Empfohlen
Isolated PMBus / SMBus Power Supplies
Telecom rectifiers, server power supplies, and industrial AC-DC modules use PMBus or SMBus over an isolation barrier for telemetry and control. The ISO1640DWR's bidirectional open-drain architecture natively supports the wired-AND behavior, clock stretching, and multi-master arbitration that PMBus requires, with no direction pins to configure. Its 1.7 Mbps rating comfortably covers the 100-400 kHz PMBus operating range with timing margin, while the enhanced EMC and low-emissions design keeps the isolator from polluting sensitive analog control loops nearby. The hot-swap capability allows replacement of power-supply cards on live backplanes without corrupting the shared management bus. Verify the hot-swap default output state matches your power-sequencing scheme before finalizing the design.
Empfohlen
Industrial PLC and Factory Automation
In programmable logic controllers and factory automation systems, the ISO1640DWR isolates I2C links between field-side sensors, EEPROM configuration memories, or ADCs and the grounded controller section. Industrial environments combine ground potential differences, motor drive dv/dt transients, and EMI from contactors, all of which the 50 kV/us CMTI and enhanced EMC design are built to withstand. The two GPIO channels let designers add isolated status or enable signals alongside the I2C bus without a separate optocoupler, reducing component count and board area. Because the part is low power, dense I/O cards can integrate many isolated links without significant thermal budget impact. Follow TI's datasheet layout guidance for creepage and clearance around the 16-SOIC barrier.
Empfohlen
Medical Equipment Isolation
Patient-connected medical devices require galvanic isolation of digital interfaces to protect patients from leakage currents and fault voltages. The ISO1640DWR's 5000 VRMS UL 1577 isolation rating and capacitive isolation barrier support isolated I2C links to front-end sensors, calibration EEPROMs, and patient-monitoring analog modules. The low-emissions design is advantageous in medical environments where radiated emissions limits are strict and other sensitive analog measurement chains operate nearby. Hot-swap support suits modular patient-monitoring systems where sensor pods are attached to live equipment. Designers should perform the full medical-system isolation and creepage/clearance analysis at the enclosure level; the isolator is one element of a complete patient-safety isolation strategy.
Empfohlen
Test and Measurement Equipment
Bench instruments, data loggers, and automated test systems frequently need an isolated I2C port to probe, program, or monitor devices-under-test at different ground potentials. The ISO1640DWR provides a 5000 VRMS isolated two-wire interface with 1.7 Mbps headroom, letting the instrument's host controller talk to DUT EEPROMs and sensors without ground-loop current corrupting measurements. The hot-swap behavior permits attaching the fixture to a powered DUT safely, and the two GPIO channels provide isolated trigger or enable lines in the same 16-pin package. For instrument front panels and fixture cabling, keep the bus short and use moderate pull-ups to preserve edge rates at the full 1.7 Mbps capability.
Empfohlen
Grid Infrastructure and Solar Inverters
Solar string inverters, energy-storage converters, and grid-tie monitoring equipment use isolated I2C links between the high-voltage power stage and low-voltage control electronics. The ISO1640DWR's 50 kV/us CMTI survives the steep dv/dt from SiC and IGBT switching legs, and its 5000 VRMS rating supports the reinforced isolation levels expected between the grid-connected stage and user-accessible control circuits. Hot-swap capability supports board replacement in modular power racks without dropping the system management bus. The low-emissions capacitive isolation keeps conducted and radiated EMI within inverter EMC budgets. Route the isolation barrier with sufficient board creepage and keep high dv/dt planes away from the isolator's side-to-side routing to maintain immunity.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ISO1640DWR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ISO1641DWR |
|---|---|---|
| Package | 16-SOIC (DW), 7.50 mm | 16-SOIC (DW) - same footprint |
| Brand | Texas Instruments | Texas Instruments |
| Isolation Rating (UL 1577) | 5000 VRMS | 5000 VRMS |
| Data Rate | 1.7 Mbps | 1.7 Mbps |
| CMTI | 50 kV/us | 50 kV/us |
| Hot-Swap Default Output State | ISO1640 default behavior | Different default state - see datasheet |
Wichtigste Unterscheidungsmerkmale
- Highest isolation grade in the ISO164x family (vs. ISO1642 (8-pin D))
- Includes GPIO channels alongside isolated I2C (vs. ISO1641DWR)
- Hot-swap operation on live buses (vs. Generic I2C level translators (e.g., PCA9306))
Designhinweise
The ISO1640DWR provides 5000 VRMS isolation in the 16-SOIC (DW) package, and achieving this rating on your board requires respecting creepage and clearance around the isolation barrier. Keep high-voltage routing and copper pours away from the isolator's side-to-side region; if the PCB is used in a reinforced-isolation application, consider a slot or routed channel under the barrier area. Follow the TI ISO164x datasheet layout section and applicable UL 1577 system-level spacing requirements rather than relying on the package alone.
Because both I2C sides use open-drain outputs, pull-up resistor selection directly sets bus speed. To reach the 1.7 Mbps capability, minimize bus capacitance (short traces, few devices per side) and use pull-ups around 1-2 kOhm at 3.3V; for 100-400 kHz operation, 4.7 kOhm is typically acceptable. Estimate the rise time as approximately 0.85 x Rpullup x Cbus and verify against the I2C rise-time limit for your target mode. Long backplane segments should use a buffer such as the TCA9517 on the non-isolated segment.
Do not confuse the ISO1640DWR (16-pin DW, 5000 VRMS) with the 8-pin D variants ISO1642/1643/1644, which are rated only 3000 VRMS and have a different pinout - they are not drop-in compatible. Also verify the hot-swap and unpowered-side default output states against your power-sequencing requirements: ISO1640 and ISO1641 differ in this behavior while being otherwise pin-identical. Substituting one for the other without checking the default-state table can cause bus contention or spurious transactions during hot-plug events.
Compliance-Informationen
UL 1577 isolation rating of 5000 VRMS confirmed in 16-DW package per TI datasheet. RoHS compliance per distributor listing; REACH, lead-free, halogen-free, and conflict-minerals status not stated in provided data.
