ISO7741BDWR Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7741BDWR is a general purpose digital isolator manufactured by Texas Instruments, designed for galvanic isolation applications requiring 5000Vrms isolation voltage with 4-channel unidirectional signal transmission. This capacitive coupling technology device operates at 100Mbps data rate with 85kV/µs common mode transient immunity in a 16-SOIC surface mount package. The part is Active status and ROHS3 compliant, suitable for industrial and automotive isolation circuits. Substitute parts are identified when equivalent electrical performance, package compatibility, and isolation specifications align with application requirements.

Key Parameters

Parameter	Value	Unit
Isolation Voltage	5000	Vrms
Number of Channels	4	—
Channel Configuration	3/1 (Unidirectional)	—
Data Rate	100	Mbps
Common Mode Transient Immunity (Min)	85	kV/µs
Propagation Delay (tpLH / tpHL Max)	16 / 16	ns
Pulse Width Distortion (Max)	4.9	ns
Supply Voltage Range	2.25 – 5.5	V
Operating Temperature Range	−55 to +125	°C
Package / Case	16-SOIC (0.295", 7.50mm Width)	—
Technology	Capacitive Coupling	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	2 (1 Year)	—

Substitute Part Grouping Explanation

Substitute parts for the ISO7741BDWR are classified into two categories based on electrical parameter alignment:

Parametric Equivalents (Texas Instruments ISO774x Series): Parts ISO7741DWR, ISO7741FBDWR, and ISO7741FDWR maintain identical electrical specifications across all critical parameters: 5000Vrms isolation, 4-channel unidirectional configuration, 100Mbps data rate, 85kV/µs CMTI, 16ns propagation delay, and −55°C to +125°C operating range. These parts differ only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and inventory availability. All are Active status, ROHS3 compliant, and use capacitive coupling technology.

Similar Parts (Skyworks Solutions SI864x Series): Parts SI8641BB-B-ISR, SI8641BD-B-IS2, SI8641BD-B-ISR, SI8641ED-B-IS2, and SI8641ED-B-ISR provide functional isolation capability with the same 4-channel unidirectional configuration and 16-SOIC package. However, these parts exhibit reduced CMTI performance (35–50kV/µs versus 85kV/µs), higher data rate capability (150Mbps versus 100Mbps), and narrower operating temperature range (−40°C to +125°C versus −55°C to +125°C). SI8641BB-B-ISR operates at reduced isolation voltage (2500Vrms). These differences require application-level evaluation for compatibility.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage (Vrms)	Data Rate (Mbps)	CMTI Min (kV/µs)	Propagation Delay Max (ns)	Operating Temp (°C)	Package	Packaging Format
ISO7741BDWR	Texas Instruments	5000	100	85	16	−55 to +125	16-SOIC	Cut Tape & Digi-Reel
ISO7741DWR	Texas Instruments	5000	100	85	16	−55 to +125	16-SOIC	Cut Tape & Digi-Reel
ISO7741FBDWR	Texas Instruments	5000	100	85	16	−55 to +125	16-SOIC	Tape & Reel
ISO7741FDWR	Texas Instruments	5000	100	85	16	−55 to +125	16-SOIC	Cut Tape & Digi-Reel
SI8641BB-B-ISR	Skyworks Solutions	2500	150	35	13	−40 to +125	16-SOIC	Tape & Reel
SI8641BD-B-IS2	Skyworks Solutions	5000	150	50	13	−40 to +125	16-SOIC	Tube
SI8641BD-B-ISR	Skyworks Solutions	5000	150	35	13	−40 to +125	16-SOIC	Cut Tape & Digi-Reel
SI8641ED-B-IS2	Skyworks Solutions	5000	150	50	13	−40 to +125	16-SOIC	Tube
SI8641ED-B-ISR	Skyworks Solutions	5000	150	35	13	−40 to +125	16-SOIC	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Substitution (Parametric Equivalents): ISO7741DWR, ISO7741FBDWR, and ISO7741FDWR are direct electrical equivalents to ISO7741BDWR. All three parts maintain identical isolation voltage (5000Vrms), data rate (100Mbps), CMTI (85kV/µs), propagation delay (16ns), and operating temperature range (−55°C to +125°C). Selection among these three is determined by packaging format requirements: Cut Tape & Digi-Reel format for ISO7741DWR and ISO7741FDWR, or Tape & Reel format for ISO7741FBDWR. All are Active status and ROHS3 compliant. Inventory availability differs: ISO7741FDWR has highest stock (36,114 pcs), followed by ISO7741DWR (20,300 pcs) and ISO7741FBDWR (2,764 pcs).

Conditional Substitution (Skyworks SI864x Series): SI8641BD-B-ISR and SI8641ED-B-ISR are suitable substitutes when application requirements accommodate reduced CMTI performance (35kV/µs versus 85kV/µs) and narrower low-temperature operating range (−40°C minimum versus −55°C minimum). These parts offer higher data rate capability (150Mbps) and maintain 5000Vrms isolation voltage. SI8641BD-B-ISR and SI8641ED-B-ISR are available in Cut Tape & Digi-Reel format with substantial inventory (95,400 pcs and 47,420 pcs respectively). SI8641BD-B-IS2 and SI8641ED-B-IS2 provide identical electrical performance but are packaged in Tube format with lower inventory availability.

Not Recommended: SI8641BB-B-ISR operates at reduced isolation voltage (2500Vrms) and is suitable only for applications not requiring 5000Vrms isolation specification.

Frequently Asked Questions (FAQ)

Q: Can ISO7741DWR replace ISO7741BDWR directly? A: Yes. ISO7741DWR is a parametric equivalent with identical electrical specifications: 5000Vrms isolation, 100Mbps data rate, 85kV/µs CMTI, 16ns propagation delay, and −55°C to +125°C operating temperature. Both use 16-SOIC packaging and are ROHS3 compliant. The only difference is packaging format (both are Cut Tape & Digi-Reel compatible).

Q: What is the difference between ISO7741FBDWR and ISO7741FDWR? A: Both parts are parametric equivalents with identical electrical performance. ISO7741FBDWR is supplied in Tape & Reel format, while ISO7741FDWR is supplied in Cut Tape & Digi-Reel format. Electrical specifications are identical across all parameters.

Q: Can Skyworks SI8641BD-B-ISR replace ISO7741BDWR? A: SI8641BD-B-ISR maintains 5000Vrms isolation and 4-channel unidirectional configuration but exhibits reduced CMTI (35kV/µs versus 85kV/µs), higher data rate (150Mbps versus 100Mbps), and narrower operating temperature range (−40°C to +125°C versus −55°C to +125°C). Substitution is conditional on application tolerance for these parameter differences.

Q: Why does SI8641BB-B-ISR have lower isolation voltage? A: SI8641BB-B-ISR is rated for 2500Vrms isolation, which is half the 5000Vrms specification of ISO7741BDWR. This part is not suitable for applications requiring 5000Vrms isolation.

Q: What packaging formats are available for direct equivalents? A: ISO7741DWR and ISO7741FDWR are supplied in Cut Tape & Digi-Reel format. ISO7741FBDWR is supplied in Tape & Reel format. All three are parametric equivalents with identical electrical specifications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. ISO7741BDWR and all parametric equivalents (ISO7741DWR, ISO7741FBDWR, ISO7741FDWR) are ROHS3 compliant. Skyworks SI864x series parts are also ROHS3 compliant.

Q: What is the moisture sensitivity level difference between parts? A: ISO7741BDWR and Texas Instruments parametric equivalents are rated MSL 2 (1 Year). Skyworks SI8641BD-B-ISR and SI8641ED-B-ISR are rated MSL 2A (4 Weeks). SI8641BD-B-IS2 and SI8641ED-B-IS2 are rated MSL 3 (168 Hours). Lower MSL ratings require shorter shelf life management.

Q: Can I use SI8641ED-B-ISR in place of ISO7741BDWR for low-temperature applications? A: SI8641ED-B-ISR operates down to −40°C, not −55°C. If your application requires operation below −40°C, SI8641ED-B-ISR is not suitable. Use ISO7741BDWR or its parametric equivalents (ISO7741DWR, ISO7741FBDWR, ISO7741FDWR) which operate to −55°C.

Q: What is the significance of CMTI rating differences? A: CMTI (Common Mode Transient Immunity) specifies the maximum rate of voltage change the isolator can withstand without errors. ISO7741BDWR has 85kV/µs CMTI, while Skyworks SI864x parts have 35–50kV/µs CMTI. Applications with high dV/dt switching transients require the higher CMTI rating.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message