ISO7761DBQ - 6-Channel 5/1 Digital Isolator, 3kVrms | Texas Instruments
MPN: ISO7761DBQ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.07 | $30.70 |
| 100 | $2.62 | $262.00 |
| 500 | $2.21 | $1,105.00 |
| 1,000 | $1.84 | $1,840.00 |
ISO7761DBQ Overview
A digital isolator is a semiconductor device that transfers data across an galvanically isolated barrier using high-voltage capacitive or magnetic coupling instead of an optocoupler LED. Within the broader taxonomy a digital isolator falls under isolators -> interface ICs -> integrated circuits, and it replaces legacy optocouplers in applications that demand higher speed, lower power, better CMTI, and tighter channel-to-channel timing skew. The ISO7761 specifically targets the reinforced insulation class per UL 1577 and is certified by VDE, CSA, TUV and CQC.
Key features include 100 Mbps signaling on all six channels simultaneously, 85 kV/us minimum CMTI, low propagation delay of typically 11 ns, low pulse-width distortion of 0.5 ns, and 2.5 mA per-channel quiescent current at 1 Mbps. The robust EMC performance includes system-level IEC 61000-4-2 (ESD) ratings above 8 kV contact and 15 kV air, along with IEC 61000-4-4 (EFT) compliance. All inputs and outputs support 2.25 V to 5.5 V supplies, allowing voltage level translation across the isolation barrier.
The ISO7761 is fabricated on TI's proprietary silicon-dioxide (SiO2) capacitive isolation technology, which delivers industry-leading CMTI performance and radiation tolerance. Internal refresh circuitry continuously resynchronizes the output state to the input, eliminating bit errors from CMTI events. The device integrates dc-dc converter interface pins (VCC pins are independent on each side), and all logic I/O pins use Schmitt-trigger inputs for noise immunity.
Typical applications include industrial fieldbus isolation (RS-485, CAN, SPI), motor drive gate-driver signal isolation, solar inverter high-voltage interface isolation, PLC analog/digital I/O module isolation, and medical equipment patient-isolation interfaces. The 5/1 channel count matches the typical MCU SPI or UART port arrangement. When designing with the ISO7761, place 0.1 uF and 1 uF decoupling capacitors close to each VCC pin and ensure that the high-voltage barrier trace clearance meets end-equipment isolation standards.
Drop-in alternatives for ISO7761DBQ — 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 ISO7761DBQ (same form factor and footprint) — differing in Package, MSL Level, Channel Configuration, Number of Channels, Common-Mode Transient Immunity (CMTI).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISO7761DBQR
✅ Drop-In✓ In Stock
$1.84 / Unit
View Datasheet →ISO7761FDBQ
✅ Drop-In✓ In Stock
$2.69 / Unit
View Datasheet →ISO7761FDBQR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7742DBQR
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →ISO7741DBQR
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →ISO7761DBQ Specifications
| Isolation Type | Digital Isolator (capacitive SiO2) |
| Number of Channels | 6 |
| Channel Configuration | 5 Forward / 1 Reverse |
| Isolation Rating (UL 1577) | 3000 Vrms (DBQ package) |
| Data Rate (max) | 100 Mbps |
| Common-Mode Transient Immunity (CMTI) | 85 kV/us (min) |
| Propagation Delay (typ) | 11 ns |
| Pulse-Width Distortion (max) | 0.5 ns |
| Supply Voltage (each side) | 2.25 V to 5.5 V |
| Quiescent Current per Channel (1 Mbps) | 2.5 mA (typ) |
| Operating Temperature | -40 C to +125 C |
| Package | 16-SSOP (DBQ), 0.154 inch / 3.90 mm body width |
| Mounting Type | Surface Mount |
| Safety Approvals | UL 1577, VDE, CSA, TUV, CQC |
| EMC Coverage | IEC 61000-4-2 ESD, IEC 61000-4-4 EFT |
| MSL Level | 2 |
ISO7761DBQ Pin Configuration
| Pin 1 | VCC1 — Power supply, side 1 (2.25 V to 5.5 V) |
| Pin 2 | IN1 — Logic input, channel 1 |
| Pin 3 | IN2 — Logic input, channel 2 |
| Pin 4 | IN3 — Logic input, channel 3 |
| Pin 5 | IN4 — Logic input, channel 4 |
| Pin 6 | IN5 — Logic input, channel 5 |
| Pin 7 | GND1 — Ground, side 1 |
| Pin 8 | OUT1 — Logic output, channel 1 |
| Pin 9 | OUT2 — Logic output, channel 2 |
| Pin 10 | OUT3 — Logic output, channel 3 |
| Pin 11 | OUT4 — Logic output, channel 4 |
| Pin 12 | OUT5 — Logic output, channel 5 |
| Pin 13 | GND2 — Ground, side 2 |
| Pin 14 | OUT6 — Logic output, reverse channel 6 (side 2 -> side 1) |
| Pin 15 | IN6 — Logic input, reverse channel 6 (side 2) |
| Pin 16 | VCC2 — Power supply, side 2 (2.25 V to 5.5 V) |
Typical Applications
ISO7761DBQ is suitable for 6 applications: Industrial Fieldbus Isolation, Motor Drive Gate Driver Signal Isolation, Solar Inverter High-Voltage Interface, PLC Analog and Digital I/O Module Isolation, Medical Equipment Patient Isolation, Battery Management System (BMS) Isolation.
Industrial Fieldbus Isolation
The ISO7761DBQ provides reinforced 3000 Vrms isolation for industrial fieldbus nodes including RS-485 transceivers, CAN-FD buses, and SPI peripherals across an 800 V or 1000 V dc bus. With 100 Mbps per-channel data rate and 85 kV/us CMTI, the device tolerates fast switching transients from inverters and motor drives on the same board, eliminating bit errors on the bus. Five forward channels map directly to UART TX/RTS/CTS plus two GPIO, while the reverse channel carries UART RX, replacing two slower optocouplers with one SSOP-16 IC.
Recommended
Motor Drive Gate Driver Signal Isolation
The ISO7761DBQ delivers reinforced isolation between a low-voltage MCU and a 600 V / 1200 V IGBT or SiC gate driver stage. The 85 kV/us minimum CMTI prevents false gate pulses during fast Vds transitions on the power switch, a critical requirement for motor inverters operating at 20-100 kHz PWM. With 11 ns typical propagation delay and 0.5 ns pulse-width distortion, the device preserves the dead-time accuracy of the original MCU PWM signals. Five forward channels carry the three PWM phases plus fault feedback, while the reverse channel returns the overcurrent flag.
Recommended
Solar Inverter High-Voltage Interface
The ISO7761DBQ isolates the control board from the high-voltage dc-link of a solar inverter, where common-mode dv/dt can exceed 50 kV/us during IGBT turn-off. The 100 Mbps data rate supports high-resolution PWM and fast MPPT updates, while the 3000 Vrms isolation rating satisfies IEC 62109 safety requirements for PV systems up to 1000 V dc. Five forward channels isolate the PWM and enable signals, and the reverse channel isolates the fault feedback line, all within one 16-SSOP package that fits underneath the gate-driver heatsink area.
Recommended
PLC Analog and Digital I/O Module Isolation
The ISO7761DBQ provides the channel count needed for a typical 4-output plus 1-input digital I/O card, leaving one channel unused or for redundancy. The 2.25-5.5 V supply range on each side matches the 3.3 V logic of PLC backplanes and the 5 V logic of field-side drivers, eliminating external level shifters. The 85 kV/us CMTI rejects the switching noise of nearby relay coils and TRIAC loads, while the 3000 Vrms isolation meets IEC 61131-2 reinforced insulation requirements for industrial control.
Recommended
Medical Equipment Patient Isolation
The ISO7761DBQ delivers reinforced 3000 Vrms isolation required for patient-connected medical devices such as patient monitors, infusion pumps, and ECG systems per IEC 60601-1. With 100 Mbps data rate, the device handles high-resolution ADC data streams and LCD video sidebands across the isolation barrier without adding audible or visual artifacts. The low 2.5 mA per-channel quiescent current extends battery life on portable devices, while the SSOP-16 footprint allows compact, handheld form factors.
Recommended
Battery Management System (BMS) Isolation
The ISO7761DBQ isolates the slave-side battery monitor ICs (such as the BQ79616 family) from the master MCU in a 400 V or 800 V traction battery pack. Five forward channels carry daisy-chain communication and enable signals, while the reverse channel handles the FAULT return line. The 85 kV/us CMTI prevents spurious wake-ups during precharge relay switching, and the -40 C to +125 C temperature grade supports under-the-hood automotive environments. Reinforced 3000 Vrms isolation meets the IEC 61851 and UN R100 requirements for electric vehicle battery systems.
Recommended
Recommended Products Summary
Engineering reference data for ISO7761DBQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISO7761DBQR | ISO7761FDBQ | ISO7761FDBQR | ISO7742DBQR | ISO7741DBQR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-SSOP (DBQ) | 16-SSOP (DBQ) | 16-SSOP (DBQ) | 16-SSOP (DBQ) | 16-SSOP (DBQ) | 16-SSOP (DBQ) |
| Number of Channels | 6 | 6 | 6 | 6 | 4 | 4 |
| Channel Direction | 5 Forward / 1 Reverse | 5/1 | 5/1 | 5/1 | 3/1 | 3/1 |
| Max Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps |
| CMTI (min) | 85 kV/us | 85 kV/us | 85 kV/us | 85 kV/us | 25 kV/us | 25 kV/us |
| Isolation Rating (UL 1577) | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms |
| AEC-Q100 Qualified | No | No | Yes | Yes | No | No |
Key Differentiators
- Industry-leading 85 kV/us CMTI vs 25 kV/us on ISO774x (vs ISO7741DBQR)
- 6 channels in 5/1 configuration vs 4 channels in 3/1 (vs ISO7742DBQR)
- Reinforced 3000 Vrms UL 1577 rating in narrow-body SSOP (vs ISO7761DW)
Design Notes
Place a 0.1 uF low-ESR ceramic bypass capacitor within 2 mm of each VCC pin (VCC1 at pin 1, VCC2 at pin 16), plus a bulk 1 uF to 10 uF capacitor on each supply rail. The SSOP-16 (DBQ) body width is only 3.90 mm, so use a four-layer PCB with a continuous ground plane directly beneath the part to maximize isolation barrier creepage and minimize switching-node coupling. Per TI datasheet layout guidance, no PCB copper or traces should cross the isolation barrier - keep all side-1 copper on the left half and all side-2 copper on the right half of the package outline.
Drive the input pins (IN1-IN6) with CMOS source impedance below 50 ohm to keep the 11 ns propagation delay and 0.5 ns pulse-width distortion within datasheet limits. Avoid long PCB traces between the isolator and the MCU or peripheral; keep each input trace under 25 mm. If driving the inputs from a logic buffer that has series resistance, place the buffer within 50 mm of the isolator input pin. Inputs have internal Schmitt-trigger hysteresis; no external hysteresis resistors are required.
Do not connect the two grounds (GND1 at pin 7 and GND2 at pin 13) together anywhere on the PCB - the 3000 Vrms isolation depends on maintaining this barrier. Use separate ground planes for side 1 and side 2, joined only at the system-level isolation star-point. Do not place any decoupling capacitor across the isolation barrier. Never apply reverse voltage to VCC1 or VCC2; each side has independent ESD clamps that are not rated for reverse polarity. For reinforced insulation, the PCB must maintain a minimum 8 mm creepage distance across the isolation barrier per IEC 61010-13. Estimated: input capacitance contribution to propagation delay is approximately 4 ps per pF of stray capacitance; trace length 25 mm adds approximately 2-3 pF total.
Compliance Information
RoHS compliant per TI product page. UL 1577, VDE, CSA, TUV, CQC safety certified per the TI ISO7761 product family page. AEC-Q100 qualified variants are ISO7761FDBQ / ISO7761FDBQR, not the standard ISO7761DBQ.
