TLP621-4BLSM Equivalent & Substitute Parts

Part Overview

The TLP621-4BLSM 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 full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified based on matching electrical specifications, isolation voltage, channel configuration, and package compatibility to ensure direct functional equivalence in circuit applications.

Substiute Parts

TLP621-4BLSM

Isocom Components 2004 LTDIn Stock: 1109TLP621-4BLSM Datasheet

Current PartRFQ

ISP521-4XSM

Isocom Components 2004 LTDIn Stock: 1061ISP521-4XSM Datasheet

Parametric EquivalentRFQ

ISP621-4XGRSM

Isocom Components 2004 LTDIn Stock: 1109ISP621-4XGRSM Datasheet

Parametric EquivalentRFQ

ISP621-4XSM

Isocom Components 2004 LTDIn Stock: 1144ISP621-4XSM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLP621-4BLSM are qualified based on the following critical parameters that must match or exceed the main part specifications:

• Number of Channels: 4 channels required
• Voltage - Isolation: 5300Vrms minimum
• Current Transfer Ratio: 50% (Min) @ 5mA and 600% (Max) @ 5mA
• Output Type: Transistor output configuration
• Voltage - Output (Max): 55V
• Current - Output / Channel: 50mA
• Vce Saturation (Max): 400mV
• Package / Case: 16-SMD, Gull Wing surface mount
• Operating Temperature Range: -30°C ~ 100°C
• Compliance: RoHS3 Compliant, REACH Unaffected

All three substitute parts (ISP521-4XSM, ISP621-4XGRSM, ISP621-4XSM) meet these electrical and mechanical requirements and are manufactured by the same supplier, ensuring functional equivalence and direct pin-compatible replacement capability.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active production components with full RoHS3 compliance and REACH unaffected status, matching the regulatory and environmental requirements of the TLP621-4BLSM. The primary distinction among substitutes is the rise/fall time specification: the TLP621-4BLSM specifies 2µs rise and 3µs fall times, while all substitute parts specify 4µs rise and 3µs fall times. This difference does not affect functional equivalence for standard isolation applications but should be evaluated in timing-critical circuits requiring the faster rise time of the main part. All parts maintain identical isolation voltage, current transfer ratios, output voltage and current ratings, saturation voltage, and operating temperature range. Selection should be based on application timing requirements and component availability.

Frequently Asked Questions (FAQ)

Q: Can ISP521-4XSM, ISP621-4XGRSM, and ISP621-4XSM be used interchangeably with TLP621-4BLSM?

A: Yes, all three substitute parts are pin-compatible and electrically equivalent for standard isolation applications. They share identical isolation voltage (5300Vrms), channel count (4), current transfer ratios, output specifications, and package configuration (16-SMD, Gull Wing). The primary difference is rise time specification (4µs vs. 2µs), which is not significant for most applications.

Q: What is the key difference between the TLP621-4BLSM and its substitutes?

A: The TLP621-4BLSM specifies a 2µs typical rise time, while all substitute parts specify 4µs typical rise time. Both maintain 3µs typical fall time. This difference is application-dependent and should be evaluated for circuits with strict timing requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts (ISP521-4XSM, ISP621-4XGRSM, ISP621-4XSM) are RoHS3 compliant with REACH unaffected status, matching the compliance profile of the TLP621-4BLSM.

Q: What is the isolation voltage rating for these optoisolators?

A: All parts in this group, including the main part and substitutes, provide 5300Vrms isolation voltage across four independent channels.

Q: Are these parts suitable for surface mount assembly?

A: Yes, all parts use 16-SMD Gull Wing surface mount packaging, suitable for automated PCB assembly processes.

Q: What is the maximum output current per channel?

A: Each of the four channels supports a maximum output current of 50mA, with a maximum output voltage of 55V.