ISO1641DWR - 5000Vrms I2C Isolator 1.7Mbps | Texas Instruments
Teilenummer: ISO1641DWR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.16 | $3,16 |
| 10 | $2.95 | $29,50 |
| 100 | $2.68 | $268,00 |
| 500 | $2.45 | $1.225,00 |
| 1.000 | $2.22 | $2.220,00 |
ISO1641DWR Übersicht
A digital isolator is a semiconductor device that transfers digital signals across an isolation barrier, preventing high voltages or ground-potential differences from propagating between two sides of a circuit. Within the signal-chain hierarchy, it belongs to the interface IC family, sitting alongside optocouplers and magnetic/capacitive isolators, and is a core building block of galvanic isolation and power-management architectures. Unlike optocouplers, modern CMOS digital isolators provide faster data rates, tighter timing, lower power, and far better aging characteristics.
Key features of the ISO1641 include bidirectional SDA isolation with TI integrated one-shot dynamic logic for I2C clock stretching support, a unidirectional (clock) second channel, hot-swappable inputs that prevent bus latch-up during live insertion, and open-drain outputs that natively interface with wired-AND I2C buses. Enhanced EMC performance, including the 50 kV/us CMTI rating, keeps the barrier intact in electrically noisy industrial environments.
Technically, the ISO1641 uses TI capacitive isolation technology with high-voltage isolation capacitors and on-chip signal conditioning. The bidirectional channel resolves bus contention automatically, so SDA behaves as a single wired-AND node across the barrier without external logic. Low-power operation suits battery-backed and densely packed field modules.
Typical applications include isolated I2C interfaces for industrial Programmable Logic Controllers (PLCs), battery management systems (BMS), power-supply supervision and PMBus telemetry, and isolated GPIO extension in motor drives and renewable-energy inverters.
Design consideration: the DW-package 5000 Vrms rating requires respecting creepage and clearance on the PCB layout; do not route high-voltage traces across the isolated region, and keep the barrier area free of solder-mask or conformal-coating bridging.
This page synthesizes verified distributor data, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet.
Drop-in-Alternativen für ISO1641DWR – 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 ISO1641DWR (gleiche Bauform und Footprint) – abweichend in Isolation Rating (UL 1577), Isolation Type, Output Type.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ISO1640DWR
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$2.21 / Stück
Datenblatt ansehen →ISO1642DWR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ISO1643DWR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ISO1644DWR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ISO1641DW
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ISO1641DWR Technische Daten
| Product Type | Hot-swappable bidirectional I2C digital isolator with unidirectional clock channel |
| Number of Channels | 2 |
| Isolation Rating (UL 1577) | 5000 Vrms (16-DW package) |
| Maximum Data Rate | 1.7 Mbps |
| CMTI (Common-Mode Transient Immunity) | 50 kV/us |
| Ausgangstyp | Open drain |
| Interface Standard | I2C compatible |
| Hot-Swap Function | Yes (inputs protected during live insertion) |
| Isolation Type | Capacitive isolation barrier |
| Gehäuse | 16-SOIC (DW), 7.50 mm width |
| Montageart | Surface Mount |
| Emissions | Low emissions (enhanced EMC design) |
| RoHS-Status | Compliant |
| Packing | Tape and Reel (R suffix) |
ISO1641DWR 16-soic (dw), 7.50 mm width Pinbelegungsleitfaden
Pinbelegung für ISO1641DWR (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 ISO1641DWR.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
ISO1641DWR ist geeignet für 6 Anwendungs: Isolated I2C in Industrial PLCs, Battery Management Systems (BMS), Power Supply Supervision and PMBus Telemetry, Motor Drives and Inverters, Isolated GPIO Extension in Renesas/MCU Systems, Medical and Test Instrumentation Isolation.
Isolated I2C in Industrial PLCs
The ISO1641DWR fits Programmable Logic Controller (PLC) I/O modules where a controller must communicate with sensors across a galvanic barrier separating the 24 V industrial field domain from logic-side electronics. Its 5000 Vrms UL 1577 isolation rating withstands sustained field overvoltages, and the 50 kV/us CMTI rating prevents data corruption from contactor and relay switching transients that routinely exceed 10 kV/us in industrial cabinets. The hot-swap inputs allow live module replacement without latching the I2C bus, a common maintenance requirement in PLC racks. Installed on the SDA/SCL run between the PLC backplane controller and the isolated peripheral carrier, the open-drain outputs connect directly to the wired-AND bus without external buffer logic, and the 1.7 Mbps rating leaves ample margin above 400 kHz fast-mode operation.
Empfohlen
Battery Management Systems (BMS)
In multi-series battery packs for EVs, e-mobility, and energy storage, the ISO1641DWR isolates the low-voltage I2C telemetry bus from the high-voltage cell stack. The 5000 Vrms isolation barrier covers the working potential of high-voltage stacks, while the 50 kV/us CMTI immunity maintains signal integrity when contactors and precharge circuits switch kilovolt-per-microsecond transients nearby. Because the ISO1641 is hot-swappable, battery modules can be connected or removed while the system is energized without corrupting the bus, and the low-power design minimizes quiescent drain from isolated auxiliary rails, directly improving shelf life and standby runtime. The open-drain outputs natively share the wired-AND I2C bus with cell-monitoring and fuel-gauge devices, keeping the isolated-side bill of materials to just the isolator and standard pull-up resistors.
Empfohlen
Power Supply Supervision and PMBus Telemetry
AC-DC and high-voltage DC-DC power supplies increasingly expose I2C/PMBus telemetry for health monitoring, and the ISO1641DWR provides the isolation between the primary or high-voltage secondary controller and the system-management bus. Its 5000 Vrms UL 1577 rating satisfies reinforced-isolation requirements of off-line supplies, while the 1.7 Mbps data rate comfortably handles PMBus 400 kHz command traffic for voltage readback, fault registers, and fan control. The enhanced EMC design and 50 kV/us CMTI keep telemetry reliable through converter switching events and surge testing. Because the hot-swap input prevents false start-up signals during live hot-plug of power shelves, the part suits telecom rectifiers and server power supplies where cards are inserted into energized backplanes.
Empfohlen
Motor Drives and Inverters
In motor-drive and solar-inverter designs, the ISO1641DWR isolates the I2C configuration and status bus between the ground-referenced microcontroller and controllers riding on the high-side or gate-driver domain. SiC and GaN power stages produce switching edges with slew rates approaching the 50 kV/us CMTI limit of lesser isolators, so the ISO1641's enhanced-EMC capacitive barrier is a strong fit for noise floors near power semiconductors. The 5000 Vrms rating covers the DC-link potential of 400 V and 800 V bus architectures. Its open-drain outputs let an EEPROM or digital potentiometer share the isolated I2C bus for gain and offset trimming, and hot-swap behavior protects the bus during inverter servicing when harnesses are connected under power.
Empfohlen
Isolated GPIO Extension in Renesas/MCU Systems
The ISO164x family includes GPIO-capable variants, making the ISO1641 a natural I2C-front-end for extending general-purpose I/O across an isolation barrier in embedded control systems. Paired with an I2C GPIO expander on the isolated side, the design moves switch, relay, and LED status lines across the 5000 Vrms barrier while the MCU keeps its I2C peripheral on the logic domain. The 1.7 Mbps bus speed supports fast polling of expansion registers, and the low emissions design simplifies compliance testing for EN-class industrial products. The hot-swap inputs are valuable in modular control cabinets where expansion cards are inserted with the system powered, preventing bus latch-up that generic unidirectional isolators frequently exhibit in the same scenario.
Empfohlen
Medical and Test Instrumentation Isolation
Bench instruments and patient-connected equipment benefit from the ISO1641DWR where an I2C-controlled subsystem must be floated relative to the host. The 5000 Vrms UL 1577 rating supports the basic insulation levels common in test-and-measurement and medical monitoring front ends, and the capacitive, low-emissions barrier avoids the LED aging and slow propagation of optocoupler solutions, preserving sub-microsecond propagation delay for responsive control loops. Hot-swap inputs allow probe heads and patient modules to be connected live during calibration workflows without bus corruption. Because the isolator draws little power, it can sit on small isolated auxiliary supplies, simplifying the design of the isolated floating domain's isolated supply and reducing creepage constraints on the auxiliary DC-DC converter.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ISO1641DWR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ISO1640DWR | ISO1642DWR | ISO1643DWR | ISO1644DWR |
|---|---|---|---|---|---|
| Package | 16-SOIC (DW), 7.50 mm | 16-SOIC (DW) - same | 16-SOIC (DW) - same | 16-SOIC (DW) - same | 16-SOIC (DW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Isolation Rating (UL 1577) | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms |
| Data Rate | 1.7 Mbps | 1.7 Mbps | 1.7 Mbps | 1.7 Mbps | 1.7 Mbps |
| CMTI | 50 kV/us | 50 kV/us | 50 kV/us | 50 kV/us | 50 kV/us |
| Hot-Swap Function | Yes | Yes | Yes | Yes | Yes |
Wichtigste Unterscheidungsmerkmale
- Unidirectional SCL for simpler single-controller buses (vs. ISO1640DWR)
- 5000 Vrms in the wider DW package (vs. ISO1644DWR)
- Integrated one-shot logic removes external I2C isolation glue (vs. generic unidirectional digital isolators)
Designhinweise
To preserve the 5000 Vrms UL 1577 rating in the 16-DW package, keep a continuous keep-out zone under and around the isolator with no traces, vias, or copper pours crossing the isolation barrier. Verify creepage and clearance per the datasheet DW-package figure before routing; solder mask alone does not count as isolation distance. Route side-1 and side-2 grounds on separate layers that never overlap beneath the barrier region, and avoid conformal-coating bridges across the isolated gap that could reduce effective surface distance.
The ISO1641 outputs are open drain, so both sides of the I2C bus require pull-up resistors to their respective local supply rails. Size pull-ups using the standard I2C rise-time equation for total bus capacitance; with the isolator's propagation delay added, verify total rise time still meets the I2C specification at your intended speed. Because one-shot dynamic logic handles bidirectional SDA, do not add external buffers in the bidirectional path without reviewing the datasheet timing diagrams for contention behavior.
A common failure mode is selecting the wrong family variant: ISO1641 has a unidirectional SCL channel, so designs requiring multi-controller arbitration across the barrier (clock driven from both sides) need ISO1640 instead. Also confirm hot-swap behavior applies to your insertion scenario - the inputs prevent bus latch-up during live insertion, but power sequencing between side 1 and side 2 supplies should still follow the datasheet recommended operating conditions. Do not rely on the isolator for functional isolation beyond its certified ratings in mains-reinforced designs without additional barriers.
Compliance-Informationen
RoHS compliance shown on distributor listings (DigiKey). UL 1577 isolation certified at 5000 Vrms for the 16-DW package per TI product data. Other compliance attributes not stated in provided data.
