TLP521-2BL Equivalent & Substitute Parts

Part Overview

The TLP521-2BL is a dual-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 8-DIP through-hole component provides galvanic isolation up to 5300Vrms and is designed for applications requiring electrical isolation between input and output circuits. The part is currently in active production status with 743 units in stock. Substitute parts are identified to support inventory management, design flexibility, and supply chain continuity.

Substiute Parts

TLP521-2BL

Isocom Components 2004 LTDIn Stock: 776TLP521-2BL Datasheet

Current PartRFQ

ISP521-2XBL

Isocom Components 2004 LTDIn Stock: 1187ISP521-2XBL Datasheet

Parametric EquivalentRFQ

TLP521-2XBL

Isocom Components 2004 LTDIn Stock: 766TLP521-2XBL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLP521-2BL are qualified based on the following critical parameters that determine functional interchangeability:

• Number of Channels: 2 channels (dual configuration)
• Voltage - Isolation: 5300Vrms minimum
• Current Transfer Ratio: 200% minimum @ 1mA
• Output Type: Transistor output
• Voltage - Output (Max): 55V
• Current - Output / Channel: 50mA
• Package / Case: 8-DIP (0.300", 7.62mm)
• Operating Temperature Range: -30°C ~ 100°C
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant

The identified substitutes ISP521-2XBL and TLP521-2XBL meet all critical electrical and mechanical parameters required for direct replacement in applications using the TLP521-2BL.

Parameter Comparison

Engineering Selection Recommendations

All three parts—TLP521-2BL, ISP521-2XBL, and TLP521-2XBL—are active products from Isocom Components 2004 LTD with identical electrical specifications and package configurations. Selection between these parts is based on the following factors:

Compliance & Certifications: All parts are ROHS3 compliant, REACH unaffected, and carry MSL rating of 1 (unlimited moisture sensitivity). All meet the same regulatory requirements for industrial and commercial applications.

Inventory Availability: ISP521-2XBL offers the highest current stock level at 1107 units, followed by TLP521-2XBL at 704 units and TLP521-2BL at 743 units. Selection may be influenced by supply chain requirements and lead time considerations.

Timing Specifications: TLP521-2BL and TLP521-2XBL both specify turn-on/turn-off times of 3µs. ISP521-2XBL does not specify this parameter but maintains identical rise/fall time characteristics of 4µs and 3µs respectively. For applications with strict timing requirements, TLP521-2BL or TLP521-2XBL are preferred.

Frequently Asked Questions (FAQ)

Q: Can ISP521-2XBL replace TLP521-2BL in existing designs?

A: Yes. ISP521-2XBL meets all critical electrical parameters including isolation voltage, current transfer ratio, output voltage/current ratings, and package configuration. The primary difference is the unspecified turn-on/turn-off time in ISP521-2XBL documentation. For applications where this timing specification is not a design constraint, ISP521-2XBL is a direct substitute.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 8-DIP (0.300", 7.62mm) package with identical through-hole mounting. PCB layouts and socket designs are interchangeable.

Q: What is the difference between TLP521-2BL and TLP521-2XBL?

A: Both parts are from the same TLP521-2 series with identical electrical specifications and timing characteristics. The primary difference is the part number suffix, which may indicate different manufacturing batches or packaging variants. Both are active products with equivalent performance.

Q: Do these parts require any special handling or storage considerations?

A: All three parts carry MSL rating 1 (unlimited), indicating no moisture sensitivity restrictions. Standard component storage practices apply. ROHS3 compliance and REACH unaffected status confirm environmental compliance for all applications.

Q: Which part should be selected for new designs?

A: For new designs, any of the three parts is acceptable based on availability and supply chain strategy. TLP521-2BL and TLP521-2XBL are preferred if turn-on/turn-off timing specifications are critical to circuit performance.