ISP521-1 Equivalent & Substitute Parts

Part Overview

The ISP521-1 is a single-channel optoisolator with transistor output, rated for 5300Vrms isolation voltage in a 4-DIP package. This component is designed for applications requiring galvanic isolation between input and output circuits with DC input control and transistor switching capability. The ISP521-1 maintains Active product status with full RoHS3 compliance and REACH unaffected classification. Alternative models are identified to support supply chain flexibility, design optimization, and inventory management across equivalent and similar performance specifications.

Substiute Parts

ISP521-1

Isocom Components 2004 LTDIn Stock: 45328ISP521-1 Datasheet

Current PartRFQ

ISP521-1X

Isocom Components 2004 LTDIn Stock: 45128ISP521-1X Datasheet

Parametric EquivalentRFQ

TLP521-1X

Isocom Components 2004 LTDIn Stock: 2410TLP521-1X Datasheet

Parametric EquivalentRFQ

TLP621XBL

Isocom Components 2004 LTDIn Stock: 2832TLP621XBL Datasheet

Parametric EquivalentRFQ

SFH615AA

Vishay Semiconductor Opto DivisionIn Stock: 4262SFH615AA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on parametric alignment with the ISP521-1:

Parametric Equivalents (ISP521-1X, TLP521-1X, TLP621XBL): These parts match all critical electrical parameters including isolation voltage (5300Vrms), current transfer ratio range (50%-600% @ 5mA), output voltage maximum (55V), output current (50mA), and Vce saturation (400mV). All three maintain identical package configuration (4-DIP), mounting type (Through Hole), and compliance certifications (RoHS3, REACH unaffected). Parametric equivalents are direct substitutes within the specified parameter tolerance.

Similar Part (SFH615AA): This Vishay component shares the same isolation voltage (5300Vrms), current transfer ratio specifications (50%-600% @ 5mA), output current (50mA), and package form factor (4-DIP Through Hole). Differences include higher maximum output voltage (70V vs 55V), higher maximum forward current (60mA vs 50mA), extended operating temperature range (-55°C to 100°C vs -30°C to 100°C), and different turn-on/turn-off timing characteristics. The SFH615AA is suitable for applications where these parameter variations are acceptable.

Parameter Comparison

Engineering Selection Recommendations

ISP521-1X: Direct parametric equivalent manufactured by Isocom Components 2004 LTD. Identical electrical specifications, package configuration, and compliance certifications. Inventory availability of 45,100 units supports immediate procurement. Selection is appropriate for applications requiring exact parameter matching with the ISP521-1.

TLP521-1X: Parametric equivalent from Isocom Components 2004 LTD with identical isolation voltage, current transfer ratio, output specifications, and package form factor. Turn-on/turn-off time specification provided (3µs, 3µs) versus unspecified for ISP521-1. Inventory of 2,375 units available. Suitable for designs where timing characteristics are documented and acceptable.

TLP621XBL: Parametric equivalent from Isocom Components 2004 LTD with improved rise time performance (2µs vs 4µs). All other electrical parameters match ISP521-1 specifications. Inventory of 2,743 units available. Selection is appropriate for applications benefiting from faster switching response within the same isolation and output specifications.

SFH615AA: Similar part manufactured by Vishay Semiconductor Opto Division. Maintains core isolation voltage and current transfer ratio specifications. Extended operating temperature range (-55°C to 100°C) supports applications in wider environmental conditions. Higher maximum output voltage (70V) and forward current (60mA) provide design margin for higher-voltage applications. Inventory of 4,200 units available. Selection requires confirmation that parameter differences are compatible with circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can ISP521-1X be used as a direct replacement for ISP521-1?

A: Yes. ISP521-1X is a parametric equivalent with identical electrical specifications, package configuration (4-DIP Through Hole), isolation voltage (5300Vrms), current transfer ratio (50%-600% @ 5mA), output voltage (55V maximum), output current (50mA), and compliance certifications (RoHS3, REACH unaffected).

Q: What is the difference between TLP521-1X and TLP621XBL?

A: Both are parametric equivalents with identical isolation voltage, current transfer ratio, and output specifications. TLP621XBL provides faster rise time (2µs vs 4µs). Selection depends on whether improved switching speed is required for the application.

Q: Is SFH615AA compatible with ISP521-1 designs?

A: SFH615AA shares the same isolation voltage (5300Vrms), current transfer ratio range (50%-600% @ 5mA), output current (50mA), and 4-DIP package. Differences include higher maximum output voltage (70V vs 55V), higher maximum forward current (60mA vs 50mA), and extended operating temperature range (-55°C to 100°C). Compatibility depends on whether these parameter variations are acceptable for the specific application circuit.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. ISP521-1, ISP521-1X, TLP521-1X, TLP621XBL, and SFH615AA are all RoHS3 compliant with REACH unaffected status.

Q: What is the package form factor for all listed parts?

A: All parts use 4-DIP (0.300", 7.62mm) package with Through Hole mounting type, ensuring mechanical and electrical compatibility on standard PCB layouts.

Q: Which substitute part has the best inventory availability?

A: ISP521-1X has the highest inventory with 45,100 units in stock, followed by SFH615AA with 4,200 units, TLP621XBL with 2,743 units, and TLP521-1X with 2,375 units.