ISP521-1BLSMT&R Equivalent & Substitute Parts

Part Overview

The ISP521-1BLSMT&R is a single-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation up to 5300Vrms and is designed for applications requiring DC input signal isolation with transistor-based output switching. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified based on matching electrical characteristics, isolation voltage, output specifications, and surface mount packaging requirements.

Substiute Parts

ISP521-1BLSMT&R

Isocom Components 2004 LTDIn Stock: 1016ISP521-1BLSMT&R Datasheet

Current PartRFQ

ISP521-1XBLSMT&R

Isocom Components 2004 LTDIn Stock: 1865ISP521-1XBLSMT&R Datasheet

Parametric EquivalentRFQ

TLP521-1XBLSMT&R

Isocom Components 2004 LTDIn Stock: 1845TLP521-1XBLSMT&R Datasheet

Parametric EquivalentRFQ

TLP521XBLSMT&R

Isocom Components 2004 LTDIn Stock: 1820TLP521XBLSMT&R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISP521-1BLSMT&R are qualified based on the following critical parameters that determine functional interchangeability:

Isolation Voltage: All substitutes maintain 5300Vrms isolation rating, ensuring equivalent galvanic separation capability.

Channel Configuration: Single-channel design is consistent across all parts, maintaining identical signal path architecture.

Output Specifications: Maximum output voltage (55V) and output current per channel (50mA) are identical, ensuring compatible load-switching capability.

Current Transfer Ratio: All parts specify 200% minimum and 600% maximum CTR at 1mA input, providing equivalent optical coupling efficiency.

Input/Output Type: DC input with transistor output is maintained across all substitutes, preserving circuit interface requirements.

Electrical Characteristics: Forward voltage (1.15V typical), maximum DC forward current (50mA), and Vce saturation (400mV maximum) are identical.

Packaging: All substitutes use 4-SMD surface mount package with 0.300" (7.62mm) dimensions, enabling direct PCB footprint compatibility.

Compliance: All parts are RoHS3 compliant with MSL 1 rating, meeting environmental and moisture handling requirements.

The three substitute parts differ only in series designation (ISP521-1 versus TLP521-1 versus TLP521) and turn-on/turn-off timing specifications where documented.

Parameter Comparison

Engineering Selection Recommendations

All four parts are active products with identical RoHS3 compliance and MSL 1 ratings, qualifying them for equivalent use in applications requiring single-channel optoisolation at 5300Vrms with transistor output switching. Selection between ISP521-1BLSMT&R and its substitutes should be based on availability and supply chain requirements, as electrical performance and environmental compliance are equivalent across all options.

The ISP521-1 series (ISP521-1BLSMT&R and ISP521-1XBLSMT&R) and TLP521 series (TLP521-1XBLSMT&R and TLP521XBLSMT&R) are functionally interchangeable for circuit design purposes. Inventory levels vary across part numbers, with ISP521-1XBLSMT&R offering 1824 units, TLP521-1XBLSMT&R offering 1736 units, and TLP521XBLSMT&R offering 1797 units in current stock.

Frequently Asked Questions (FAQ)

Q: Can ISP521-1XBLSMT&R be used as a direct replacement for ISP521-1BLSMT&R?

A: Yes. Both parts are from the ISP521-1 series with identical electrical specifications, isolation voltage, output current rating, and 4-SMD package dimensions. They are functionally equivalent for circuit applications.

Q: What is the difference between ISP521-1 and TLP521-1 series optoisolators?

A: The ISP521-1 and TLP521-1 series share identical electrical characteristics including 5300Vrms isolation, 200-600% CTR, 55V maximum output voltage, and 50mA output current. Both use the same 4-SMD package. Series designation reflects manufacturer product line organization but does not affect functional compatibility.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All four parts use the 4-SMD (0.300", 7.62mm) surface mount package, enabling direct PCB footprint compatibility without layout modifications.

Q: Do these optoisolators meet RoHS requirements?

A: All parts are RoHS3 compliant and carry MSL 1 (unlimited moisture sensitivity) rating, meeting environmental and handling standards for industrial applications.

Q: What is the maximum isolation voltage rating?

A: All parts provide 5300Vrms galvanic isolation, ensuring equivalent electrical separation between input and output circuits.

Q: Can these parts handle the same output current and voltage?

A: Yes. All substitute parts are rated for 50mA maximum output current per channel and 55V maximum output voltage, providing identical load-switching capability.