TLP521-1 Equivalent & Substitute Parts

Part Overview

The TLP521-1 is a single-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 4-DIP through-hole component provides 5300Vrms isolation and is designed for DC input applications requiring galvanic isolation. The part is currently active in production with 89,300 units in stock. Substitute parts are identified based on matching electrical characteristics, isolation voltage, output specifications, and package compatibility to ensure direct functional replacement in circuit designs.

Substiute Parts

TLP521-1

Isocom Components 2004 LTDIn Stock: 89363TLP521-1 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

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLP521-1 are qualified based on the following critical parameters that determine functional equivalence:

• Isolation Voltage: 5300Vrms (all substitutes match)
• Number of Channels: 1 channel (all substitutes match)
• Output Type: Transistor output (all substitutes match)
• Maximum Output Voltage: 55V (all substitutes match)
• Maximum Output Current: 50mA per channel (all substitutes match)
• Current Transfer Ratio Range: 50% to 600% @ 5mA (all substitutes match)
• Package / Case: 4-DIP (0.300", 7.62mm) (all substitutes match)
• Mounting Type: Through Hole (all substitutes match)
• Operating Temperature Range: -30°C ~ 100°C (all substitutes match)
• RoHS Compliance: ROHS3 Compliant (all substitutes match)

The identified substitutes—ISP521-1X, TLP521-1X, and TLP621XBL—maintain electrical and mechanical compatibility with the TLP521-1 across all critical parameters. Timing characteristics (Turn On/Turn Off Time and Rise/Fall Time) show minor variations within acceptable tolerances for typical isolation applications.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—ISP521-1X, TLP521-1X, and TLP621XBL—are qualified as direct functional equivalents to the TLP521-1 based on matching electrical specifications and mechanical compatibility. Selection among these parts should be based on availability and packaging requirements:

• TLP521-1X maintains complete specification alignment with the original TLP521-1, including identical timing characteristics (Turn On/Turn Off Time: 3µs, 3µs).
• ISP521-1X provides equivalent electrical performance with the exception of unspecified Turn On/Turn Off Time data; all other critical parameters match the original specification.
• TLP621XBL offers improved rise time performance (2µs versus 4µs) while maintaining all other electrical and mechanical specifications.

All parts carry Active product status, ROHS3 compliance, and REACH Unaffected designation, confirming regulatory and environmental compliance equivalent to the original TLP521-1.

Frequently Asked Questions (FAQ)

Q: Can ISP521-1X be used as a direct replacement for TLP521-1?

A: Yes. ISP521-1X matches all critical electrical parameters including isolation voltage (5300Vrms), output specifications (55V maximum, 50mA per channel), current transfer ratio range (50% to 600% @ 5mA), and package configuration (4-DIP through-hole). The only difference is unspecified Turn On/Turn Off Time data; all other timing and electrical characteristics are equivalent.

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

A: Both parts are electrically equivalent to TLP521-1 across all critical parameters. The primary difference is rise time: TLP621XBL specifies 2µs rise time compared to 4µs for TLP521-1 and TLP521-1X. This faster rise time may provide improved switching performance in time-sensitive applications while maintaining identical isolation voltage, output current, and package compatibility.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts—ISP521-1X, TLP521-1X, and TLP621XBL—are supplied in 4-DIP (0.300", 7.62mm) through-hole packages, ensuring direct mechanical compatibility with existing PCB designs and assembly processes.

Q: Do the substitute parts meet the same regulatory requirements as TLP521-1?

A: Yes. All substitute parts carry ROHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited), matching the regulatory and environmental compliance profile of the original TLP521-1.

Q: Which substitute part should be selected for new designs?

A: Selection should be based on application requirements and availability. TLP521-1X provides complete specification alignment with the original part. TLP621XBL offers faster rise time (2µs) for applications requiring improved switching speed. ISP521-1X is suitable when Turn On/Turn Off Time specification is not critical to circuit performance.