ISO7740FDW Digital Isolator - Equivalent & Substitute Parts

Part Overview

The ISO7740FDW is a general purpose digital isolator manufactured by Texas Instruments, designed for applications requiring galvanic isolation up to 5000Vrms across 4 channels. This capacitive coupling technology isolator operates at 100Mbps data rate with 85kV/µs common mode transient immunity, housed in a 16-SOIC surface mount package. The device is actively produced, AEC-Q100 qualified for automotive applications, and ROHS3 compliant. Substitute parts are identified when electrical and mechanical parameters remain within the specified tolerances for this product category.

Substiute Parts

ISO7740FDW

Texas InstrumentsIn Stock: 3415ISO7740FDW Datasheet

Current PartRFQ

ISO7740DW

Texas InstrumentsIn Stock: 1272ISO7740DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISO7740FDW is determined by strict equivalence across the following critical parameters:

• Isolation voltage rating: 5000Vrms
• Channel count and configuration: 4 channels, unidirectional (4 inputs / 0 outputs)
• Data rate: 100Mbps
• Common mode transient immunity: 85kV/µs minimum
• Propagation delay specifications: 16ns maximum for both tpLH and tpHL
• Pulse width distortion: 4.9ns maximum
• Supply voltage range: 2.25V ~ 5.5V
• Operating temperature range: -55°C ~ 125°C
• Package type: 16-SOIC (0.295", 7.50mm Width)
• Technology platform: Capacitive coupling

The ISO7740DW meets all specified parameters and qualifies as a parametric equivalent. Both parts share identical electrical performance characteristics, thermal specifications, and physical packaging requirements.

Parameter Comparison

Engineering Selection Recommendations

Both ISO7740FDW and ISO7740DW are active products from Texas Instruments with identical electrical and mechanical specifications. Selection between these parts may be based on inventory availability and packaging format (both supplied in tube packaging). The ISO7740FDW currently has 3400 units in stock, while the ISO7740DW has 1191 units available. Both parts maintain AEC-Q100 automotive qualification and ROHS3 compliance, making them suitable for equivalent application deployment in automotive and industrial isolation circuits.

Frequently Asked Questions (FAQ)

Q: Can ISO7740DW be used as a direct replacement for ISO7740FDW?

A: Yes. Both parts are parametric equivalents with identical isolation voltage, channel configuration, data rate, timing specifications, supply voltage range, operating temperature range, and 16-SOIC package dimensions. No circuit modifications are required.

Q: Are there any differences in qualification or compliance between these parts?

A: No. Both parts carry identical certifications: AEC-Q100 automotive qualification, ROHS3 compliance, REACH unaffected status, and EAR99 export classification.

Q: What determines substitution eligibility for ISO7740 series isolators?

A: Substitution is valid when the following parameters match: 5000Vrms isolation rating, 4-channel unidirectional configuration, 100Mbps data rate, 85kV/µs CMTI, 16ns maximum propagation delay, 4.9ns maximum pulse width distortion, 2.25V–5.5V supply range, -55°C to 125°C operating temperature, and 16-SOIC package format.

Q: Can these parts be used in applications requiring different isolation voltages or channel counts?

A: No. These parts are specified exclusively for 5000Vrms isolation with 4 channels. Applications requiring different isolation levels or channel configurations require alternative part numbers.

Q: What is the moisture sensitivity level, and how does it affect handling?

A: Both parts have MSL 2 rating with a 1-year floor life. Standard moisture control procedures during storage and assembly are required to maintain device reliability.