TLP521-4BL Equivalent & Substitute Parts

Part Overview

The TLP521-4BL is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-DIP through-hole component provides galvanic isolation up to 5300Vrms across four independent channels, each capable of 50mA output current. The device is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when identical electrical and mechanical parameters are maintained across the isolation voltage, channel configuration, output current rating, and package specification.

Substiute Parts

TLP521-4BL

Isocom Components 2004 LTDIn Stock: 2748TLP521-4BL Datasheet

Current PartRFQ

ISP521-4XBL

Isocom Components 2004 LTDIn Stock: 1297ISP521-4XBL Datasheet

Parametric EquivalentRFQ

TLP521-4XBL

Isocom Components 2004 LTDIn Stock: 940TLP521-4XBL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLP521-4BL are qualified based on strict equivalence across the following critical parameters:

• Isolation Voltage: 5300Vrms (determines safety and regulatory compliance)
• Channel Count: 4 channels (defines circuit integration density)
• Output Type: Transistor (specifies switching characteristics)
• Maximum Output Current: 50mA per channel (establishes load-driving capability)
• Package Configuration: 16-DIP through-hole (ensures mechanical and electrical compatibility)
• Operating Temperature Range: -30°C ~ 100°C (defines thermal operating envelope)
• Current Transfer Ratio Range: 200% to 600% @ 1mA (ensures switching performance consistency)

The identified substitutes maintain all critical electrical parameters and package specifications, allowing direct replacement in existing circuit designs without modification.

Parameter Comparison

Engineering Selection Recommendations

Both TLP521-4XBL and ISP521-4XBL are qualified substitutes for the TLP521-4BL based on electrical and mechanical parameter equivalence. All three parts maintain Active product status and identical compliance certifications including RoHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity rating.

The TLP521-4XBL provides complete parameter specification including turn-on and turn-off timing data. The ISP521-4XBL maintains all critical electrical parameters with the exception of unspecified turn-on and turn-off time values; all other timing and performance characteristics remain equivalent.

Selection between these substitutes should be based on availability and application-specific timing requirements where turn-on and turn-off time specifications are critical design constraints.

Frequently Asked Questions (FAQ)

Q: Can TLP521-4XBL and ISP521-4XBL be used interchangeably with TLP521-4BL?

A: Both parts are parametric equivalents meeting all critical electrical and mechanical specifications. Direct substitution is supported for applications where the specified parameters are the design requirements.

Q: What is the significance of the isolation voltage rating of 5300Vrms?

A: The 5300Vrms isolation voltage establishes the maximum potential difference that can be safely applied between input and output circuits. This rating determines the component's suitability for high-voltage isolation applications and regulatory compliance in industrial and safety-critical systems.

Q: Are there differences in timing characteristics between the three parts?

A: TLP521-4BL and TLP521-4XBL both specify turn-on and turn-off times of 3µs. ISP521-4XBL does not provide turn-on and turn-off time specifications. All three parts specify identical rise and fall times of 4µs and 3µs respectively.

Q: Does the 16-DIP package ensure mechanical compatibility across all three parts?

A: Yes. All three parts use the 16-DIP (0.300", 7.62mm) through-hole package configuration, ensuring identical pin spacing, board layout compatibility, and mechanical mounting requirements.

Q: What compliance certifications apply to these optoisolators?

A: All three parts are RoHS3 compliant, REACH unaffected, and carry MSL rating 1 (unlimited moisture sensitivity). These certifications apply uniformly across TLP521-4BL, TLP521-4XBL, and ISP521-4XBL.

Q: What is the current transfer ratio and why is it important?

A: The current transfer ratio of 200% to 600% @ 1mA defines the relationship between input LED current and output transistor current. This parameter determines switching efficiency and is consistent across all three substitute parts.