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Texas Instruments ISOW7741FBDFMR
- Part No.:
- ISOW7741FBDFMR
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISOW7741FBDFMR.pdf
- Description:
- LOW-EMISSIONS, LOW-RIPPLE, QUAD-
- Quantity:
- Payment:
- Shipping:
Inventory:2,077
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Product details
Overview
ISOW7741FBDFMR from Texas Instruments is a reinforced-galvanic quad-channel digital isolator with integrated low-noise, low-emission DC-DC converter. It delivers 100 Mbps data rate, 5000 VRMS isolation rating, 100 kV/µs CMTI, and up to 0.55 W isolated output power (5 V → 5 V @ 110 mA). It operates across –40°C to +125°C and targets space-constrained industrial interfaces requiring self-contained isolation and power.
For engineers reviewing the ISOW7741FBDFMR datasheet, ISOW7741FBDFMR pinout, ISOW7741FBDFMR application, or ISOW7741FBDFMR equivalent, key selection criteria include its reinforced isolation certification (VDE, UL, IEC 62368-1), integrated 25 MHz low-noise DC-DC converter with 24 mV ripple, dual independent supply domains (VIO: 1.71–5.5 V; VDD: 3–5.5 V), and 20-pin SOIC-WB package with verified channel directionality (1 forward, 3 reverse).
Technical Context
The ISOW7741FBDFMR implements capacitive signal isolation using double SiO₂ barriers for data channels and thin-film polymer-insulated on-chip transformers for power conversion. Its integrated DC-DC operates at 25 MHz to minimize conducted noise and meets CISPR 32/EN 55032 Class B with >5 dB margin on 2-layer PCBs.
It features dual enable controls (EN_IO1/EN_IO2), fault reporting via EN/FLT pin, VSEL-configurable VISOOUT (3.3 V or 5 V), and robust system-level EMC including ±8 kV IEC 61000-4-2 contact ESD across the barrier. The F-suffix denotes fail-safe default-low output behavior during input loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 100 Mbps - supports high-speed UART, SPI, and CAN bus isolation without external timing constraints. |
| Isolation Rating | 5000 VRMS reinforced - certified per VDE DIN VDE V 0884-11:2017-01 and UL 1577 for safety-critical industrial and medical systems. |
| CMTI | 100 kV/µs (typical) - ensures reliable operation in noisy motor drive and grid infrastructure environments with fast transients. |
| VISOOUT Options | Configurable 3.3 V or 5 V output - selected by VSEL pin; enables direct powering of downstream 3.3 V logic or 5 V peripherals without LDO. |
| Max Isolated Power | 0.55 W (5 V → 5 V @ 110 mA) - eliminates need for external isolated DC-DC, reducing BOM count and board area in compact designs. |
| Output Ripple | 24 mV pk-pk - low-noise performance suitable for sensitive analog front-ends and precision ADC reference supplies. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive subsystems and industrial motor control enclosures. |
Pinout & Package
ISOW7741FBDFMR is housed in a 20-pin wide-body SOIC (DFM) package measuring 12.83 mm × 7.5 mm, with creepage/clearance >8 mm and reinforced insulation barrier.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA, INB, INC, IND | Input channels A–D | Side-1 digital inputs; INA/INB/INC are forward-direction, IND is reverse-direction (F-suffix device defaults low on loss-of-input). |
| OUTA, OUTB, OUTC, OUTD | Output channels A–D | Side-2 digital outputs; OUTA/OUTB/OUTC are reverse-direction, OUTD is forward-direction - matches 1F/3R channel mapping. |
| VIO, GNDIO, GND1 | Primary-side logic supply domain | VIO accepts 1.71–5.5 V; GNDIO and GND1 must be shorted - powers isolator logic and EN_IO1/EN/FLT circuitry. |
| VDD, EN/FLT, VSEL | DC-DC converter control interface | VDD = 3–5.5 V input; EN/FLT serves as enable input or open-drain fault alert; VSEL selects VISOOUT voltage (GND2 = 3.3 V, VISOOUT = 5 V). |
| VISOIN, VISOOUT, GND2, GISOIN | Secondary-side isolated power domain | VISOIN powers isolation channels; VISOOUT delivers regulated isolated output; GND2/GISOIN may be shorted or ferrite-bead filtered to suppress common-mode noise. |
| EN_IO1, EN_IO2 | Channel output enable controls | Independent enables for side-1 (EN_IO1) and side-2 (EN_IO2) outputs - supports dynamic power gating of isolated data paths. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Low-Noise DC-DC | 25 MHz switching frequency minimizes low-frequency harmonics; 24 mV pk-pk ripple enables clean power for ADCs and sensors without post-regulation. |
| CISPR 32 Class B Compliance | Validated on 2-layer PCB with >5 dB margin - eliminates need for complex filtering or 4+ layer boards in cost-sensitive factory automation designs. |
| Reinforced Isolation Certification | VDE, UL 1577, IEC 62368-1, IEC 60601-1, GB 4943.1-2011 - supports dual-MOPP medical equipment and functional safety architectures. |
| High CMTI & System-Level EMC | 100 kV/µs CMTI plus ±8 kV IEC 61000-4-2 contact ESD across barrier - ensures reliable communication in motor drives with fast IGBT switching. |
| F-Suffix Fail-Safe Behavior | Outputs default low on input loss - prevents undefined states in safety-critical control loops (e.g., emergency stop monitoring). |
Applications
| Factory Automation | Motor Control |
|---|---|
Use Scenario: PLC I/O modules interfacing with 24 V field sensors and actuators over long cables in electrically noisy plant floors. IC Role / Device Role / Timing Role: Quad-channel isolator providing bidirectional signal integrity between microcontroller and isolated RS-485/UART peripherals while powering them via integrated DC-DC. Use Value: Eliminates separate isolated power supply, reduces component count by ≥3 parts, and maintains 100 Mbps throughput for real-time motion profiling. |
Use Scenario: Inverter gate driver interface in servo drives where PWM signals cross isolation barrier alongside feedback from current/voltage sensors. IC Role / Device Role / Timing Role: Reinforced isolator delivering high-CMTI timing signals and powering isolated current-sense amplifiers directly from VISOOUT. Use Value: Prevents ground-loop noise injection into analog sensing paths; 24 mV ripple avoids ADC quantization errors in closed-loop current regulation. |
| Grid Infrastructure | Medical Equipment |
Use Scenario: Smart meter communication modules (HPLC/RF) requiring isolation between MCU and PLC transceivers in harsh EMI environments. IC Role / Device Role / Timing Role: Signal isolator with integrated 3.3 V VISOOUT powering the PLC PHY, meeting IEC 61000-4-x immunity standards. Use Value: Achieves system-level surge immunity (10 kVPK) and CISPR 32 Class B without external ferrites or shielding, lowering certification cost. |
Use Scenario: Patient-monitoring devices needing 2-MOPP isolation between microcontroller and isolated analog front-end (ECG, SpO₂). IC Role / Device Role / Timing Role: Reinforced isolator providing galvanic separation for digital control lines and powering isolated ADC reference buffers. Use Value: Certified to IEC 60601-1 and CSA 60601-1 with 250 VRMS working voltage - satisfies regulatory requirements without additional isolation components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated power applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6421ARWZ | 4 forward channels; no reverse configuration; 500 mW max output; 3.3 V only VISOOUT; lower CMTI (75 kV/µs). | Suitable for unidirectional SPI/UART isolation but cannot replace ISOW7741FBDFMR's 1F/3R channel mapping or 5 V VISOOUT capability. | Select when design requires only forward data flow and 3.3 V isolated rail; verify CMTI margin in high-dv/dt environments. |
| SI88640ED-IS | 4 forward channels; 500 mW output; 3.3/5 V VISOOUT selectable; higher efficiency (52%); no integrated EMI optimization for 2-layer boards. | Lacks CISPR 32 Class B validation on simple layouts; requires external filtering to meet emissions limits in cost-sensitive applications. | Prefer when highest power efficiency is critical and board stack-up allows 4-layer layout with dedicated ground planes for EMI control. |
Compared with ADUM6421ARWZ and SI88640ED-IS, ISOW7741FBDFMR uniquely combines 1F/3R channel directionality, 5 V/3.3 V VISOOUT flexibility, CISPR 32 Class B compliance on 2-layer PCBs, and reinforced certification for medical and industrial safety standards - making it optimal for space-constrained, high-reliability bidirectional isolation.
Availability
ISOW7741FBDFMR is available at Aetrix Electronics and suitable for factory automation, motor control, and medical equipment requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.
Supply support for ISOW7741FBDFMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and medical markets.
The ISOW77xx family was designed to eliminate external isolated power supplies in space-constrained digital isolation applications - integrating robust signal isolation, low-noise DC-DC conversion, and comprehensive safety certifications into a single 20-pin SOIC-WB package.
FAQ
What does the 'F' suffix in ISOW7741FBDFMR indicate?
The 'F' suffix in ISOW7741FBDFMR specifies fail-safe output behavior: when input signals are lost, all output channels default to low state. This prevents undefined logic levels in safety-critical control paths. The base ISOW7741 defaults high on input loss, whereas ISOW7741FBDFMR's F-suffix guarantees deterministic low-state recovery - a key requirement for emergency shutdown circuits and ISO 13849-compliant machinery control.
How is the channel directionality configured in ISOW7741FBDFMR?
ISOW7741FBDFMR implements a fixed 1-forward / 3-reverse channel configuration: INA/INB/INC drive OUTD/OUTC/OUTB (forward), while IND drives OUTA (reverse). This mapping is hardwired per the datasheet Figure 6-2 pinout and cannot be altered via configuration pins. It enables bidirectional protocols like half-duplex RS-485 where one line requires reverse isolation while three support controller-to-peripheral signaling - distinct from the 4-forward ISOW7740 or 4-reverse ISOW7744 variants.
Can ISOW7741FBDFMR operate with different input and output voltages?
Yes, ISOW7741FBDFMR supports independent supply domains: VIO (1.71–5.5 V) powers the primary-side logic, while VDD (3–5.5 V) feeds the DC-DC converter. VISOOUT is configurable to 3.3 V or 5 V via the VSEL pin, enabling mixed-voltage system interfacing - for example, a 3.3 V MCU (VIO) can isolate and power a 5 V RS-485 transceiver (VISOOUT) without level shifters. VISOIN must match VISOOUT voltage for proper channel operation.
What safety certifications apply specifically to ISOW7741FBDFMR?
ISOW7741FBDFMR carries reinforced isolation certifications: VDE DIN VDE V 0884-11:2017-01 (VIORM = 1500 VPK), UL 1577 (5000 VRMS), IEC 62368-1, IEC 60601-1 (2 MOPP), and GB 4943.1-2011. These are validated for the FB variant (reinforced) - not the 'B' suffix versions. Its 1000 VRMS working voltage and 6250 VPK surge rating make it suitable for Class I medical devices and industrial equipment requiring dual protection means per IEC 61508 SIL-2.
Does ISOW7741FBDFMR require external components for EMI compliance?
No external EMI components are required for CISPR 32 Class B compliance on 2-layer PCBs - the ISOW7741FBDFMR's integrated DC-DC converter is emission-optimized with >5 dB margin per TI test reports. However, VISOIN and VISOOUT should be connected via a ferrite bead or low-dropout regulator per layout guidelines to suppress residual high-frequency noise. GND2 and GISOIN may also be ferrite-bead filtered to reduce common-mode currents without compromising certification.
ISOW7741FBDFMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- ISOW774x
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 85kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 15.7ns, 15.7ns
- Pulse Width Distortion (Max):
- 5ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.4ns
- Voltage - Supply:
- 2.97V ~ 3.63V, 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
ISOW7741FBDFMR FAQ
1.How can I place an order for ISOW7741FBDFMR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISOW7741FBDFMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISOW7741FBDFMR reliable?
The price and inventory of ISOW7741FBDFMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISOW7741FBDFMR is usually 5 days.
3.What payment methods are accepted for ISOW7741FBDFMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISOW7741FBDFMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISOW7741FBDFMR?
ISOW7741FBDFMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISOW7741FBDFMR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISOW7741FBDFMR?
For technical support, including ISOW7741FBDFMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISOW7741FBDFMR requirements.
6.How does Aetrix verify that ISOW7741FBDFMR is sourced from the original manufacturer or authorized distributors?
All ISOW7741FBDFMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISOW7741FBDFMR meets industry standards.
7.What is the process for return or replacement of ISOW7741FBDFMR?
All ISOW7741FBDFMR units undergo pre-shipment inspection (PSI). If there is an issue with ISOW7741FBDFMR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISOW7741FBDFMR part is unused and in its original packaging.
Return procedure for ISOW7741FBDFMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISOW7741FBDFMR Tags
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