ISO7741FDBQR Digital Isolator: Specs, Design, Alternatives

ISO7741FDBQR Digital Isolator: Specs, Design Guide, and Alternatives

Admin · Aug 27, 2026 · 3 min read AI-Assisted · Updated: Aug 26, 2026 · Fact-Checked

ISO7741FDBQR is a 4-channel reinforced digital isolator from TI with 100 Mbps data rate, 85 kV/µs CMTI, and 3000 Vrms isolation. Available now at $0.7636 (1000+).

Quick Answers: What Is the ISO7741FDBQR and What Are Its Key Verified Specs?

The Texas Instruments ISO7741FDBQR is a reinforced quad-channel digital isolator that transfers digital signals across an isolation barrier, preventing ground loops and protecting low-voltage circuitry. It delivers 100 Mbps data rate, 85 kV/µs common-mode transient immunity (CMTI), and 3000 Vrms reinforced isolation in a 16-pin SSOP (DBQ) package. As of 2026-08-27, it is in stock at XAIPART with 99,999 units available and a base price of $0.7636 at quantities of 1000 or more. This device operates from 2.25 V to 5.5 V and across -55°C to +125°C, making it suitable for industrial and automotive applications.

Technical Guide: How to Select and Design In the ISO7741FDBQR

When selecting a digital isolator, verify that the channel configuration, data rate, isolation rating, and output state meet your system requirements. The ISO7741FDBQR provides 4 channels in a 3 forward / 1 reverse arrangement, supporting full-duplex communication with one reverse channel for status or handshake signals. Its 100 Mbps data rate handles high-speed SPI, UART, and GPIO isolation. The 3000 Vrms reinforced isolation per UL 1577 is suitable for safety-critical applications, and the 85 kV/µs CMTI ensures reliable operation in noisy environments like motor drives and inverters.

For design-in, pay attention to power supply decoupling: place 0.1 µF capacitors close to VCC1 and VCC2 pins (pins 1 and 16) and route grounds carefully to minimize noise. The default-low output state (F suffix) provides a known safe state during power-up, which is critical for fail-safe designs. If you need default-high outputs, choose the ISO7741DBQR variant.

PCB layout must respect creepage and clearance distances for the isolation voltage. The SSOP package has a compact footprint, but ensure adequate spacing between primary and secondary sides. Follow the manufacturer's layout recommendations in the datasheet for optimal EMC performance.

Alternatives & Comparison: Drop-In Replacements for ISO7741FDBQR

Parameter	ISO7741FDBQR	ISO7741DBQR	ISO7741DWR	ISO7741FQDWRQ1	ISO7741FDBQ	ISO7741FDBQRQ1
Output State	Default low	Default high	Default low	Default low	Default low	Default low
Package	16-SSOP (DBQ)	16-SSOP (DBQ)	Wide-body SOIC	Wide-body SOIC	16-SSOP (DBQ)	16-SSOP (DBQ)
Isolation Rating	3000 Vrms	3000 Vrms	5000 Vrms	5000 Vrms	3000 Vrms	3000 Vrms
Pin-Compatible with ISO7741FDBQR	Yes	Yes	No	No	Yes	Yes
Automotive Grade	No	No	No	Yes	No	Yes
Packaging	Tape & Reel	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	Tube	[DATA_NEEDED]

Summary: For a drop-in replacement with default-high outputs, choose the ISO7741DBQR. For higher isolation (5000 Vrms) in a larger package, consider the ISO7741DWR or ISO7741FQDWRQ1 (automotive). The ISO7741FDBQ offers the same die in tube packaging, and the ISO7741FDBQRQ1 is the automotive-grade version.

Industry Insight: Market Position, Lifecycle, and Supply

The ISO7741FDBQR is an active product from Texas Instruments, indicating ongoing production and availability. As of 2026-08-27, XAIPART lists 99,999 units in stock, suggesting healthy supply. Pricing tiers start at $1.3091 for single units and decrease to $0.7636 at 1000+ quantities. The device is certified to UL 1577, VDE, CSA, TUV, and CQC, which supports its use in safety-critical applications. [DATA_NEEDED: market share or competitive landscape data]

Trends & Outlook: What Buyers Should Watch

Demand for digital isolators continues to grow in industrial automation, renewable energy, and automotive electrification. The ISO7741FDBQR's 100 Mbps data rate and 85 kV/µs CMTI position it well for high-speed, noisy environments. Buyers should monitor supply availability and pricing trends, as the active lifecycle ensures continued production. The availability of automotive-grade variants (ISO7741FDBQRQ1) and higher-isolation options (ISO7741DWR) provides flexibility for evolving requirements. As designs move toward higher data rates and stricter safety standards, components like the ISO7741FDBQR with reinforced isolation and robust EMC will remain relevant.

Frequently Asked Questions

The ISO7741FDBQR provides 3000 Vrms reinforced isolation per UL 1577 in the DBQ package. According to the TI datasheet, this rating ensures robust protection against high-voltage transients in industrial and automotive applications.

The ISO7741FDBQR supports data rates up to 100 Mbps, making it suitable for high-speed SPI, UART, and GPIO isolation. This high throughput is achieved with low propagation delay, ensuring reliable communication in time-critical systems.

The ISO7741FDBQR has a common-mode transient immunity (CMTI) of 85 kV/µs. This high CMTI ensures reliable operation in noisy environments like motor drives and inverters, where fast voltage transients can otherwise corrupt data.

The ISO7741FDBQR has default-low outputs (F suffix), while the ISO7741DBQR has default-high outputs. Both are pin-compatible and share the same package and isolation rating. Choose the F variant for fail-safe low state during power-up.

The ISO7741FDBQR operates from -55°C to +125°C, making it suitable for extreme industrial and automotive environments. This wide range ensures reliable performance in harsh conditions.

ISO7741FDBQR is available from authorized distributors like DigiKey, Mouser, and LCSC. As of 2026-08-26, LCSC lists it at $0.9813. Check current stock and pricing on distributor websites.

As of 2026-08-26, the price of ISO7741FDBQR is approximately $0.98 at LCSC for single-unit quantities. Volume pricing may be lower; check distributors like DigiKey for bulk discounts.

Lead time for ISO7741FDBQR varies by distributor and stock levels. DigiKey typically ships within 24 hours if in stock. For large orders, lead time may be 4-8 weeks. Check distributor websites for real-time availability.

As of 2026-08-26, ISO7741FDBQR is in stock at major distributors like DigiKey and LCSC. Availability can change quickly, so verify current stock on distributor websites before ordering.

The best drop-in replacement for ISO7741FDBQR is the ISO7742FDBQR, which is pin-compatible and offers the same package and isolation rating. Other options include ISO7741DBQR (default-high) and ISO7741DWR (wide-body SOIC with 5000 Vrms).

Yes, the ISO7741FDBQR is suitable for automotive applications due to its -55°C to +125°C range and robust EMC performance. It is commonly used in battery management systems and motor drives.

The ISO7741FDBQR datasheet is available from TI's website at https://www.ti.com/lit/ds/symlink/iso7741.pdf. It is also available on third-party sites like Alldatasheet and DigChip.

The ISO7741FDBQR is a 4-channel digital isolator with 3 forward and 1 reverse channels, 3000 Vrms reinforced isolation, 100 Mbps data rate, 85 kV/µs CMTI, and default-low outputs. It operates from 2.25V to 5.5V and -55°C to +125°C, in a 16-pin SSOP package.

The best TI equivalent for ISO7741FDBQR is the ISO7742FDBQR, which is pin-compatible and offers the same isolation and data rate. For a default-high version, choose ISO7741DBQR.