ISO7831 - Reinforced 3-Channel Digital Isolator | Texas Instruments
MPN: ISO7831 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.19 | $2,190.00 |
Drop-in alternatives for ISO7831 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISO7831DWR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7731DWR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7741DWR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7742DWR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7721DWR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7721BDWR
✅ Drop-In✓ In Stock
$1.75 / Unit
View Datasheet →ISO7721FQDWRQ1
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →ISO7842FDWW
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →ISO7831 Maximum Ratings & Electrical Characteristics
| Number of Channels | 3 (2 forward, 1 reverse) |
| Isolation Rating | 8000 VPK (reinforced) |
| VIOWM | 2000 Vrms |
| Creepage | 14.5 mm |
| Clearance | 8 mm |
| Data Rate | 100 Mbps |
| CMTI | 70 kV/µs |
| Propagation Delay | 11 ns |
| Pulse Width Distortion | 1 ns |
| Supply Voltage (VCC1/VCC2) | 2.25 V to 5.5 V |
| Operating Temperature | -40°C to +125°C |
| Package | 16-SOIC (DW) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Fail-Safe Output | Yes (default low) |
ISO7831 Pin Configuration
| Pin 1 | VCC1 — Supply voltage for side 1 |
| Pin 2 | GND1 — Ground for side 1 |
| Pin 3 | INA — Input channel A |
| Pin 4 | INB — Input channel B |
| Pin 5 | INC — Input channel C |
| Pin 6 | EN — Enable (active high) |
| Pin 7 | GND1 — Ground for side 1 |
| Pin 8 | OUTA — Output channel A |
| Pin 9 | OUTB — Output channel B |
| Pin 10 | OUTC — Output channel C |
| Pin 11 | GND2 — Ground for side 2 |
| Pin 12 | VCC2 — Supply voltage for side 2 |
| Pin 13 | GND2 — Ground for side 2 |
| Pin 14 | NC — No connect |
| Pin 15 | NC — No connect |
| Pin 16 | GND2 — Ground for side 2 |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ISO7831 is suitable for 6 applications: Industrial Fieldbus Communication, Motor Control, Power Inverters, Isolated SPI/UART Interfaces, Medical Equipment, Automotive Electronics.
Industrial Fieldbus Communication
The ISO7831 provides reinforced isolation for industrial fieldbus interfaces such as PROFIBUS and Modbus. Its 100 Mbps data rate and high CMTI of 70 kV/µs ensure reliable communication in electrically noisy factory environments. The 2/1 channel configuration can isolate TX, RX, and clock signals, while the 8000 VPK isolation rating protects against ground potential differences up to 2000 Vrms. This makes it ideal for PLCs, motor drives, and remote I/O modules where signal integrity and safety are critical.
Recommended
Motor Control
In motor control applications, the ISO7831 isolates the low-voltage controller from the high-voltage power stage. Its high CMTI of 70 kV/µs prevents false triggering from fast-switching IGBTs or MOSFETs, while the 100 Mbps data rate supports high-frequency PWM signals. The reinforced isolation rating of 8000 VPK ensures safety in 480V AC drives. The device's low propagation delay of 11 ns maintains precise timing for current sensing and gate drive signals, improving overall motor efficiency and reliability.
Recommended
Power Inverters
The ISO7831 is used in power inverters for solar, UPS, and electric vehicle applications to isolate control signals from high-voltage DC buses. Its 8000 VPK isolation rating and 14.5 mm creepage provide robust protection against voltage surges. The device's high CMTI ensures stable operation in the presence of fast-switching transients, while the 100 Mbps data rate allows for high-speed communication between the DSP and gate drivers. This enhances system safety and reliability in demanding power conversion environments.
Recommended
Isolated SPI/UART Interfaces
The ISO7831 provides galvanic isolation for SPI and UART interfaces in mixed-voltage systems. Its 2/1 channel configuration can isolate MOSI, MISO, and SCLK signals, while the 100 Mbps data rate supports high-speed communication. The device's low propagation delay and pulse width distortion ensure accurate data transmission, and its wide supply voltage range (2.25 V to 5.5 V) allows interfacing with both 3.3 V and 5 V logic. This makes it ideal for isolated sensor interfaces, data acquisition systems, and communication modules.
Recommended
Medical Equipment
The ISO7831 is suitable for medical equipment requiring reinforced isolation to protect patients from electric shock. Its 8000 VPK isolation rating and compliance with IEC 60747-17 ensure safety in applications such as patient monitors, infusion pumps, and diagnostic devices. The device's low power consumption and high reliability make it ideal for battery-powered portable medical devices. The wide operating temperature range of -40°C to +125°C ensures performance in various clinical environments.
Recommended
Automotive Electronics
The ISO7831 is AEC-Q100 qualified, making it suitable for automotive applications such as battery management systems, on-board chargers, and motor drives. Its high isolation rating of 8000 VPK and CMTI of 70 kV/µs ensure reliable operation in the harsh automotive environment. The device's wide temperature range and low propagation delay support high-speed communication between microcontrollers and power electronics. This enhances the safety and efficiency of electric and hybrid vehicles.
Recommended
Recommended Products Summary
Engineering reference data for ISO7831 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISO7831DWR | ISO7731DWR | ISO7741DWR |
|---|---|---|---|---|
| Package | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Isolation Rating | 8000 VPK | 8000 VPK | 5000 VPK | 5000 VPK |
| Number of Channels | 3 (2/1) | 3 (2/1) | 3 (2/1) | 4 (3/1) |
| Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
| CMTI | 70 kV/µs | 70 kV/µs | 70 kV/µs | 70 kV/µs |
| Propagation Delay | 11 ns | 11 ns | 11 ns | 11 ns |
| Supply Voltage Range | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V |
Key Differentiators
- Highest isolation rating in its class (vs ISO7731DWR)
- High CMTI of 70 kV/µs (vs ISO7721DWR)
- Reinforced isolation certification (vs ISO7731DWR)
Design Notes
Place 0.1 µF decoupling capacitors close to each VCC pin (VCC1 and VCC2) to minimize power supply noise. Use a 10 µF bulk capacitor on each side if the supply is shared with other components. Ensure the ground planes on both sides are separated and only connected at the system star point to maintain isolation integrity.
Maintain at least 8 mm clearance and creepage between the high-voltage and low-voltage sides on the PCB to meet the isolation rating. Avoid routing traces under the isolator. Use a solid ground plane on each side to reduce EMI and improve CMTI performance.
Do not exceed the absolute maximum ratings for supply voltage (6 V) or input voltage. Ensure the enable pin is properly driven to avoid unintended output states. When using the fail-safe feature, note that the output defaults to low when the input supply is lost, which may not be suitable for all applications.
Compliance Information
ISO7831 is AEC-Q100 qualified and RoHS compliant per TI product page.
