TLP521-4BLSM Equivalent & Substitute Parts

Part Overview

The TLP521-4BLSM is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-pin surface mount device provides galvanic isolation up to 5300Vrms across four independent channels, each capable of 50mA output current. The part is active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified based on matching electrical isolation characteristics, channel configuration, output specifications, and surface mount packaging requirements.

Substiute Parts

TLP521-4BLSM

Isocom Components 2004 LTDIn Stock: 1089TLP521-4BLSM Datasheet

Current PartRFQ

ISP521-4XBLSM

Isocom Components 2004 LTDIn Stock: 919ISP521-4XBLSM Datasheet

Parametric EquivalentRFQ

TLP521-4XBLSM

Isocom Components 2004 LTDIn Stock: 995TLP521-4XBLSM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLP521-4BLSM are qualified based on the following critical parameters that must match or exceed the main part specifications:

• Isolation Voltage: 5300Vrms minimum
• Channel Count: 4 channels
• Output Type: Transistor output configuration
• Maximum Output Current: 50mA per channel
• Maximum Output Voltage: 55V
• Current Transfer Ratio Range: 200% to 600% @ 1mA
• Package Type: 16-SMD, Gull Wing surface mount
• Operating Temperature Range: -30°C to 100°C
• Input Type: DC
• Compliance: RoHS3 compliant, REACH unaffected

The identified substitutes maintain electrical equivalence across isolation performance, switching characteristics, and output drive capability while preserving the same physical footprint and thermal operating envelope.

Parameter Comparison

Engineering Selection Recommendations

All three parts—TLP521-4BLSM, ISP521-4XBLSM, and TLP521-4XBLSM—are active production components with identical RoHS3 compliance and REACH unaffected status. Selection between these parts is based on availability and specific timing characteristics.

The TLP521-4BLSM and TLP521-4XBLSM are functionally identical, with both specifying turn-on and turn-off times of 3µs. The ISP521-4XBLSM provides the same electrical performance but does not specify turn-on/turn-off timing parameters. For applications requiring documented switching speed specifications, TLP521-4BLSM or TLP521-4XBLSM are preferred. For applications where turn-on/turn-off timing is not a design constraint, ISP521-4XBLSM is a valid substitute with equivalent isolation, output current, and thermal characteristics.

All parts maintain the same 16-SMD gull wing package footprint, enabling direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can ISP521-4XBLSM replace TLP521-4BLSM in all applications?

A: ISP521-4XBLSM is electrically equivalent for isolation voltage, channel count, output current, and output voltage specifications. The primary difference is that turn-on/turn-off timing is not specified for ISP521-4XBLSM. If your application has no timing constraints on these parameters, substitution is valid. If turn-on/turn-off timing is specified in your design requirements, use TLP521-4BLSM or TLP521-4XBLSM.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 16-SMD, Gull Wing package with identical pinout and footprint, enabling direct substitution on the PCB without layout changes.

Q: What is the difference between TLP521-4BLSM and TLP521-4XBLSM?

A: Both parts are from the same TLP521-4 series with identical electrical specifications, including turn-on/turn-off times of 3µs. The difference is in the packaging designation (BLSM vs. XBLSM). Both are active production parts with full RoHS3 compliance.

Q: Do all substitutes meet the same isolation voltage requirement?

A: Yes. All three parts specify 5300Vrms isolation voltage, meeting the same galvanic isolation standard.

Q: Are there any thermal or environmental differences between these parts?

A: No. All three parts operate across the same temperature range (-30°C to 100°C) and share identical moisture sensitivity level (MSL 1, Unlimited) and compliance certifications.

Q: Can these parts be used interchangeably in high-speed switching applications?

A: TLP521-4BLSM and TLP521-4XBLSM both specify 3µs turn-on and turn-off times with 4µs and 3µs rise/fall times respectively. ISP521-4XBLSM does not specify turn-on/turn-off timing. For documented high-speed switching performance, use TLP521-4BLSM or TLP521-4XBLSM.