ISO1500DBQR - 1Mbps 3kVrms Isolated RS-485/RS-422
MPN: ISO1500DBQR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.926 | $0.93 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ISO1500DBQR Overview
A digital isolator transfers signals across an insulating barrier while maintaining separate ground domains. The ISO1500 uses that isolation concept for its receive and transmit paths, helping protect a controller from ground-potential differences and electrical stress on the bus. In the RS-485/RS-422 hierarchy, the transceiver drives or receives differential signals over a balanced cable, allowing reliable communication over longer distances than single-ended interfaces.
The ISO1500DBQR operates at data rates up to 1 Mbps and supports both RS-485 and RS-422 applications. Its bus pins are protected against IEC ESD contact discharge and IEC EFT events, according to the Texas Instruments product information. The receiver output includes failsafe behavior for bus-open, bus-short, and bus-idle conditions, helping the system avoid undefined receiver states during faults or inactive periods. These features suit industrial automation, motor drives, and isolated equipment interfaces.
The device is supplied in an ultra-small 16-pin SSOP package, which supports compact PCB layouts while simplifying assembly. Its isolation rating is 3 kVrms, and the product family is intended for applications where reliable communication across a high-voltage barrier is valuable. The exact supply-voltage limits, receiver thresholds, propagation delays, and bus-loading values should be confirmed in the manufacturer datasheet before final circuit design.
Typical applications include industrial automation equipment, factory-floor controllers, motor-drive interfaces, isolated serial links, and embedded systems that communicate over long balanced cables. The half-duplex architecture means the transmitter and receiver share bus-direction control, allowing a compact two-wire RS-485 implementation. Designers should verify the direction-control timing, termination strategy, grounding arrangement, and isolation requirements for the selected bus topology.
This page combines verified manufacturer and distributor information with practical selection guidance, interface considerations, and application-oriented explanations. It is intended to help engineers identify whether the ISO1500DBQR matches the required speed, isolation level, package, and protection features for a specific industrial design.
Drop-in alternatives for ISO1500DBQR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISO1500DBQR (same form factor and footprint) — differing in Data Rate, Isolation Voltage, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISO1500DBQ
✅ Drop-In📋 Reference alternative (not in catalog)
ISO3086T
✅ Drop-In📋 Reference alternative (not in catalog)
ADM2582EBRWZ
✅ Drop-In✓ In Stock
$5.5 / Unit
View Datasheet →Si8440
✅ Drop-In📋 Reference alternative (not in catalog)
ISO1500DBQR Specifications
| Product Type | Isolated RS-485/RS-422 transceiver |
| Data Rate | Up to 1 Mbps |
| Duplex Mode | Half-duplex |
| Isolation Voltage | 3 kVrms |
| Supported Standards | TIA/EIA RS-485 and RS-422 |
| Digital Isolation Channels | 3-channel digital isolator |
| Package | 16-pin SSOP |
| Bus Protection | Protected against IEC ESD contact discharge and IEC EFT events |
| Receiver Failsafe | Failsafe for bus open, short, and idle conditions |
| Operating Temperature Range | -40 C to +125 C |
| RoHS Status | ROHS3 compliant |
| MSL | MSL Level-2-260C-1 YEAR |
| Mounting Type | Surface mount |
ISO1500DBQR Pin Configuration
| Pin 1 | [DATA_NEEDED: pin 1 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 2 | [DATA_NEEDED: pin 2 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 3 | [DATA_NEEDED: pin 3 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 4 | [DATA_NEEDED: pin 4 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 5 | [DATA_NEEDED: pin 5 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 6 | [DATA_NEEDED: pin 6 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 7 | [DATA_NEEDED: pin 7 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 8 | [DATA_NEEDED: pin 8 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 9 | [DATA_NEEDED: pin 9 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 10 | [DATA_NEEDED: pin 10 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 11 | [DATA_NEEDED: pin 11 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 12 | [DATA_NEEDED: pin 12 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 13 | [DATA_NEEDED: pin 13 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 14 | [DATA_NEEDED: pin 14 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 15 | [DATA_NEEDED: pin 15 name] — Pin function must be confirmed from the TI datasheet. |
| Pin 16 | [DATA_NEEDED: pin 16 name] — Pin function must be confirmed from the TI datasheet. |
Typical Applications
ISO1500DBQR is suitable for 6 applications: Industrial Automation Communication, Motor Drive Interfaces, Isolated Serial Equipment Links, Factory Floor Sensors and Remote I/O, Process and Building Automation, Embedded Serial Communication.
Industrial Automation Communication
The ISO1500DBQR is suitable for industrial automation links that need a compact, isolated RS-485 or RS-422 interface. Its 1-Mbps maximum data rate supports controller-to-controller or controller-to-module communication, while 3-kVrms isolation helps separate the logic ground from the field bus. The bus pins include protection against IEC ESD contact discharge and IEC EFT events, making the device a strong candidate for factory equipment where cables and ground conditions are less predictable. Designers should still validate cable length, termination, common-mode limits, and direction-control timing against the complete system requirements.
Recommended
Motor Drive Interfaces
The ISO1500DBQR can connect a motor-drive controller to an isolated RS-485 or RS-422 command or monitoring bus. A 1-Mbps half-duplex interface provides sufficient bandwidth for status, configuration, and supervisory data, while the integrated isolation barrier helps prevent drive-side ground transients from reaching the controller electronics. The 16-pin SSOP package supports compact drive-control boards. Before deployment, verify the drive protocol, bus termination, isolation boundary placement, fail-safe state expectations, and whether external surge protection is required for long motor-cable runs.
Recommended
Isolated Serial Equipment Links
The ISO1500DBQR is appropriate for isolated serial links between equipment units, remote I/O modules, and test or process-control hardware. Its three-channel digital isolator and RS-485 transceiver provide an integrated interface in a 16-pin SSOP, reducing the number of discrete isolation components required for a basic design. The receiver failsafe behavior for bus-open, bus-short, and bus-idle conditions helps the system interpret inactive or faulted bus conditions. System designers should confirm supply rails, propagation timing, cable length, grounding strategy, and protection requirements in the datasheet.
Recommended
Factory Floor Sensors and Remote I/O
The ISO1500DBQR can be used as the isolated communication element in a remote I/O or sensor aggregation system. A half-duplex RS-485 bus is efficient for connecting multiple field modules over shared wiring, and the device supports data rates up to 1 Mbps for short, high-speed links. Isolation is valuable when field devices use different supply references or when ground faults may occur. Designers need to check node count, termination placement, biasing, cable topology, and whether the target bus requires full-duplex RS-422 operation rather than two-wire half-duplex RS-485.
Recommended
Process and Building Automation
The ISO1500DBQR fits process-control and building-automation systems where a controller must communicate over a protected differential bus. Its small 16-pin SSOP package helps conserve board area, while the 3-kVrms isolation barrier supports separation between low-voltage controller electronics and field wiring. The documented ESD and EFT protection features help improve interface robustness in industrial environments. A complete implementation must still validate EMC requirements, bus biasing, termination, surge withstand, grounding, and the required operating-temperature range.
Recommended
Embedded Serial Communication
The ISO1500DBQR is useful for embedded systems that need a reliable isolated serial interface without implementing a complete isolated transceiver externally. Its 1-Mbps maximum rate and half-duplex architecture suit control messages, diagnostics, and configuration traffic between a microcontroller or processor and a remote board. The SSOP package is practical for space-constrained designs, and the integrated digital isolation simplifies the isolation boundary. Firmware should include bus-direction management, timeout handling, fault detection, and safe recovery behavior for open, shorted, or idle buses.
Recommended
Recommended Products Summary
Engineering reference data for ISO1500DBQR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISO1500DBQ | ISO3086T | ADM2582E | Si8440 |
|---|---|---|---|---|---|
| Product Type | Isolated RS-485/RS-422 transceiver | Same-family isolated RS-485/RS-422 transceiver | Candidate isolated-transceiver equivalent | Candidate isolated RS-485 transceiver | Candidate isolated-interface equivalent |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Silicon Labs |
| Package | 16-pin SSOP | 16-SSOP | 16-SSOP candidate | 16-SSOP candidate | 16-SSOP candidate |
Key Differentiators
- Integrated isolation and RS-485/RS-422 interface in one 16-pin SSOP (vs ISO3086T)
- Documented receiver failsafe behavior (vs ADM2582E)
- Compact package for space-constrained isolation (vs Si8440)
- 1-Mbps half-duplex performance class (vs ISO1500DBQ)
Design Notes
Keep the logic-side and bus-side copper, ground, and isolation-barrier regions physically separated according to the Texas Instruments layout guidance. Place the transceiver and any required termination or protection components close to the bus connector so transient current paths remain short. The SSOP footprint is compact, but isolation creepage and clearance must be preserved across the barrier; do not route bus copper underneath the isolation region without checking the package and PCB requirements.
Do not assume that any isolated RS-485 transceiver with a similar package is automatically interchangeable. ISO3086T, ADM2582E, and Si8440 are candidate equivalents in the supplied cross-reference results, but their exact pin functions, supply rails, enable logic, isolation ratings, and timing must be compared with ISO1500DBQR. Confirm the exact ordering code and package drawing before using a substitute in an existing PCB.
For RS-485 or RS-422, follow the interface standard's termination and biasing requirements. Termination is commonly placed at the physical ends of the bus rather than at every node, and the half-duplex direction-control signal must be sequenced so the driver does not contend with an active receiver. Validate propagation timing and receiver behavior with the actual cable length, node count, baud rate, and system fault states.
Although the ISO1500DBQR bus pins are described as protected against IEC ESD contact discharge and IEC EFT events, external cable protection may still be required for longer field wiring or higher-energy transients. Keep the isolation barrier and cable interface away from switching nodes and high-current paths. Use a defined grounding and surge strategy that meets the equipment EMC requirements rather than relying only on the IC's internal protection.
Compliance Information
The supplied component data identifies ROHS3 compliance and MSL Level-2-260C-1 YEAR. REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status were not established by the provided source snippets and must be verified for the exact ordering code.
