ISO7240CDW Equivalent & Substitute Parts

Part Overview

The ISO7240CDW is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 4 channels, and 25Mbps data rate in a 16-SOIC package. This device is currently in Last Time Buy status, indicating discontinued production. Identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and new design implementations where active alternatives are preferred.

Substiute Parts

ISO7240CDW

Texas InstrumentsIn Stock: 1462ISO7240CDW Datasheet

Current PartRFQ

ISO7240CDWR

Texas InstrumentsIn Stock: 35214ISO7240CDWR Datasheet

MFR RecommendedRFQ

ISO7230CDW

Texas InstrumentsIn Stock: 3479ISO7230CDW Datasheet

Parametric EquivalentRFQ

ISO7240CFDW

Texas InstrumentsIn Stock: 2145ISO7240CFDW Datasheet

Parametric EquivalentRFQ

SI8640AB-B-ISR

Skyworks Solutions Inc.In Stock: 1089SI8640AB-B-ISR Datasheet

MFR RecommendedRFQ

SI8645BB-B-ISR

Skyworks Solutions Inc.In Stock: 875SI8645BB-B-ISR Datasheet

MFR RecommendedRFQ

SI8645BD-B-ISR

Skyworks Solutions Inc.In Stock: 1076SI8645BD-B-ISR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISO7240CDW is determined by the following critical parameters:

Primary Substitution Criteria:

• Package / Case: 16-SOIC (0.295", 7.50mm Width) — mechanical and electrical interface compatibility
• Number of Channels: 4 — functional requirement for signal isolation paths
• Voltage - Isolation: 2500Vrms — minimum isolation specification
• Technology: Capacitive Coupling — isolation method consistency
• Type: General Purpose — application category
• Mounting Type: Surface Mount — assembly compatibility

Secondary Compatibility Parameters:

• Voltage - Supply: 3.15V ~ 5.5V range or compatible subset
• Operating Temperature: -40°C ~ 125°C or compatible range
• RoHS Status: ROHS3 Compliant — regulatory compliance

Substitutes are grouped into two categories:

Category 1: Direct Equivalents (Same Manufacturer - Texas Instruments)

• ISO7240CDWR: Identical electrical specifications, different packaging (Cut Tape & Digi-Reel), Active status
• ISO7240CFDW: Identical electrical specifications, Tube packaging, Last Time Buy status

Category 2: Cross-Manufacturer Equivalents (Skyworks Solutions Inc.)

• SI8640AB-B-ISR: 4 channels, 2500Vrms isolation, different data rate (1Mbps vs 25Mbps), higher CMTI (35kV/µs)
• SI8645BB-B-ISR: 4 channels, 2500Vrms isolation, higher data rate (150Mbps), higher CMTI (35kV/µs), Active status
• SI8645BD-B-ISR: 4 channels, higher isolation voltage (5000Vrms), higher data rate (150Mbps), higher CMTI (35kV/µs), Active status

Category 3: Parametric Equivalent (Different Channel Count - Texas Instruments)

• ISO7230CDW: 3 channels instead of 4, identical isolation and performance specs, Last Time Buy status

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): ISO7240CDWR is the primary recommended substitute. It maintains all electrical and mechanical specifications of the ISO7240CDW while offering Active product status and improved supply availability (35,200 pcs in stock vs. 1,412 pcs). The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube), which does not affect electrical performance. Both devices are ROHS3 Compliant and carry identical regulatory certifications (EAR99, HTSUS 8542.39.0001).

For Applications Requiring Lower Channel Count: ISO7230CDW provides identical electrical performance with 3 channels instead of 4. This substitute is applicable only if the application requires exactly 3 isolated channels. Product status is Last Time Buy, similar to the main part.

For Applications Tolerating Different Data Rates: SI8640AB-B-ISR (1Mbps) and SI8645BB-B-ISR (150Mbps) are cross-manufacturer alternatives from Skyworks Solutions Inc. Both maintain 4-channel configuration, 2500Vrms isolation, and 16-SOIC package. These devices offer Active product status and superior CMTI (35kV/µs vs. 25kV/µs). Selection depends on application data rate requirements. SI8645BB-B-ISR provides significantly faster data rate (150Mbps) with faster propagation delay (13ns vs. 42ns), suitable for high-speed applications. SI8640AB-B-ISR operates at 1Mbps, appropriate for low-speed isolation applications.

For Applications Requiring Higher Isolation Voltage: SI8645BD-B-ISR provides 5000Vrms isolation (double the ISO7240CDW specification) with 150Mbps data rate and Active status. This substitute is applicable when enhanced isolation voltage is required without changing package or channel configuration.

All recommended substitutes maintain surface mount compatibility, -40°C to 125°C operating temperature range, and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can ISO7240CDWR be used as a direct replacement for ISO7240CDW? A: Yes. ISO7240CDWR is electrically and mechanically identical to ISO7240CDW. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube). Both devices are pin-compatible, have identical electrical specifications, and are ROHS3 compliant. ISO7240CDWR is recommended for new designs due to Active product status.

Q: What is the difference between ISO7240CDW and ISO7240CFDW? A: Both devices are electrically identical with 4 channels, 2500Vrms isolation, and 25Mbps data rate. Both use Tube packaging. The primary difference is product status: ISO7240CDW is Last Time Buy while ISO7240CFDW is also Last Time Buy. Both have limited long-term availability.

Q: Can SI8645BB-B-ISR replace ISO7240CDW in existing designs? A: SI8645BB-B-ISR is mechanically compatible (16-SOIC package, 4 channels, 2500Vrms isolation) but offers significantly different electrical performance: 150Mbps data rate vs. 25Mbps, 13ns propagation delay vs. 42ns, and 35kV/µs CMTI vs. 25kV/µs. Substitution is valid only if the application can tolerate or benefit from these performance improvements. Pin compatibility must be verified against specific application requirements.

Q: Why would I choose SI8645BD-B-ISR over SI8645BB-B-ISR? A: SI8645BD-B-ISR provides 5000Vrms isolation voltage compared to SI8645BB-B-ISR's 2500Vrms. All other specifications are identical. Selection depends on isolation voltage requirements. If 2500Vrms is sufficient, SI8645BB-B-ISR is appropriate. If higher isolation voltage is required, SI8645BD-B-ISR is necessary.

Q: Is ISO7230CDW a suitable substitute if my application uses only 3 channels? A: Yes, if your application requires exactly 3 isolated channels. ISO7230CDW maintains all electrical specifications of ISO7240CDW (2500Vrms isolation, 25Mbps data rate, 25kV/µs CMTI) in a 16-SOIC package. However, it has Last Time Buy status, limiting future availability.

Q: What are the supply voltage differences between these substitutes? A: ISO7240CDW, ISO7240CDWR, ISO7240CFDW, and ISO7230CDW all operate at 3.15V to 5.5V. Skyworks devices (SI8640AB-B-ISR, SI8645BB-B-ISR, SI8645BD-B-ISR) operate at 2.5V to 5.5V, providing a lower minimum supply voltage. This difference is not a barrier to substitution if your application supplies voltage within the 3.15V to 5.5V range.

Q: Are all these parts ROHS3 compliant? A: Texas Instruments parts (ISO7240CDW, ISO7240CDWR, ISO7240CFDW, ISO7230CDW) are explicitly ROHS3 compliant. Skyworks parts (SI8640AB-B-ISR, SI8645BB-B-ISR, SI8645BD-B-ISR) do not list RoHS status in the provided specifications. Verify RoHS compliance with Skyworks documentation if regulatory compliance is required.

Q: What is the difference in Moisture Sensitivity Level (MSL) between manufacturers? A: Texas Instruments parts have MSL 2 (1 Year). Skyworks parts have MSL 2A (4 Weeks). This affects storage and handling requirements. MSL 2A requires more stringent moisture control during storage and has a shorter shelf life before reflow soldering.