TLP621-4 Equivalent & Substitute Parts

Part Overview

The TLP621-4 is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation up to 5300Vrms across four independent channels in a 16-DIP package. The device is classified as Active product status and is suitable for applications requiring high-voltage isolation with DC input control and transistor switching output.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across critical isolation, switching, and thermal parameters within the specified operating range.

Substiute Parts

TLP621-4

Isocom Components 2004 LTDIn Stock: 5644TLP621-4 Datasheet

Current PartRFQ

ISP521-4X

Isocom Components 2004 LTDIn Stock: 2080ISP521-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TLP621-4 is determined by strict equivalence across the following critical parameters:

• Number of Channels: Must equal 4
• Voltage - Isolation: Must equal 5300Vrms
• Current Transfer Ratio range: Must maintain 50% (Min) @ 5mA and 600% (Max) @ 5mA
• Output Type: Must be Transistor
• Voltage - Output (Max): Must equal 55V
• Current - Output / Channel: Must equal 50mA
• Vce Saturation (Max): Must not exceed 400mV
• Operating Temperature: Must cover -30°C ~ 100°C
• Package / Case: Must be 16-DIP (0.300", 7.62mm)
• Mounting Type: Must be Through Hole

The ISP521-4X meets all substitution criteria and is classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both TLP621-4 and ISP521-4X are Active status products manufactured by Isocom Components 2004 LTD with identical compliance certifications (ROHS3 Compliant, REACH Unaffected, MSL 1). Selection between these parts should be based on availability and packaging format. The TLP621-4 is supplied in standard packaging, while the ISP521-4X is supplied in Tube packaging. Both devices meet all electrical and mechanical requirements for direct substitution in 16-DIP through-hole applications requiring quad-channel 5300Vrms isolation with 50mA transistor output per channel.

Frequently Asked Questions (FAQ)

Q: Can ISP521-4X replace TLP621-4 in existing designs?

A: Yes. Both parts are electrically and mechanically equivalent across all critical parameters: 4-channel configuration, 5300Vrms isolation, 50% to 600% current transfer ratio, 55V maximum output voltage, 50mA per-channel output current, and 16-DIP through-hole package. Both operate across -30°C to 100°C and meet ROHS3 compliance.

Q: What is the difference between TLP621-4 and ISP521-4X?

A: The primary difference is packaging format. TLP621-4 uses standard packaging while ISP521-4X uses Tube packaging. Rise/Fall time specification for ISP521-4X is 4µs/3µs compared to 2µs/3µs for TLP621-4. Turn-on/turn-off time is not specified for ISP521-4X.

Q: Are both parts suitable for high-voltage isolation applications?

A: Yes. Both devices provide 5300Vrms isolation rating and are designed for galvanic isolation in industrial and power management applications. Operating temperature range of -30°C to 100°C supports standard industrial environments.

Q: What mounting considerations apply to these parts?

A: Both parts use through-hole mounting in 16-DIP (0.300", 7.62mm) package format. PCB layout and soldering procedures are identical between the two parts.