ISP621-4BLSM Equivalent & Substitute Parts

Part Overview

The ISP621-4BLSM is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-pin surface mount device provides 5300Vrms isolation across four independent channels, each capable of 50mA output current. The part is currently active in production with 748 units in stock. Substitute parts are identified when identical electrical and mechanical parameters are maintained across all critical specifications, ensuring direct functional equivalence in circuit applications.

Substiute Parts

ISP621-4BLSM

Isocom Components 2004 LTDIn Stock: 854ISP621-4BLSM Datasheet

Current PartRFQ

ISP621-4XBLSM

Isocom Components 2004 LTDIn Stock: 866ISP621-4XBLSM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The ISP621-4XBLSM qualifies as a parametric equivalent to the ISP621-4BLSM based on strict alignment of all critical electrical and mechanical specifications. Substitution eligibility is determined by the following parameters:

• Number of Channels: 4 (identical)
• Voltage - Isolation: 5300Vrms (identical)
• Current Transfer Ratio: 200% - 600% @ 5mA (identical)
• Rise / Fall Time: 4µs, 3µs (identical)
• Output Type: Transistor (identical)
• Voltage - Output (Max): 55V (identical)
• Current - Output / Channel: 50mA (identical)
• Vce Saturation (Max): 400mV (identical)
• Operating Temperature: -30°C ~ 100°C (identical)
• Package / Case: 16-SMD, Gull Wing (identical)
• RoHS Status: ROHS3 Compliant (identical)
• Moisture Sensitivity Level: 1 (Unlimited) (identical)

All parameters match without deviation, confirming direct functional and mechanical interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Both the ISP621-4BLSM and ISP621-4XBLSM are active production parts from Isocom Components 2004 LTD with identical electrical and mechanical specifications. Selection between these parts is based on inventory availability and supply chain considerations rather than technical performance differences. The ISP621-4BLSM currently has 748 units in stock, while the ISP621-4XBLSM has 784 units available. Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for industrial and commercial applications. The 16-SMD gull wing package format ensures compatibility with standard surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can ISP621-4XBLSM replace ISP621-4BLSM in existing designs?

A: Yes. Both parts are parametrically identical across all electrical and mechanical specifications, including isolation voltage, channel count, output current rating, and package format. Direct substitution is supported without circuit modification.

Q: Are there differences in isolation voltage between these parts?

A: No. Both the ISP621-4BLSM and ISP621-4XBLSM provide 5300Vrms isolation across all four channels.

Q: Do these parts have different current transfer ratios?

A: No. Both parts maintain identical current transfer ratio specifications of 200% minimum to 600% maximum at 5mA input current.

Q: Are the package dimensions and pin configurations identical?

A: Yes. Both parts use the 16-SMD gull wing package format with identical pin assignments and mechanical dimensions.

Q: What is the difference between ISP621-4BLSM and ISP621-4XBLSM?

A: These parts are parametrically equivalent. The designation difference reflects manufacturing or distribution variants from Isocom Components 2004 LTD, but no functional or electrical differences exist.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the ISP621-4BLSM and ISP621-4XBLSM are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements.

Q: What is the maximum output current per channel?

A: Both parts support 50mA maximum output current per channel across all four channels.

Q: Are the operating temperature ranges the same?

A: Yes. Both parts operate across the identical temperature range of -30°C to 100°C.