TLP521BLSM Equivalent & Substitute Parts

Part Overview

The TLP521BLSM is an optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This single-channel device provides galvanic isolation rated at 5300Vrms and is designed for DC input applications requiring transistor-based switching outputs. The component is housed in a 4-SMD package and maintains active product status with full RoHS3 compliance. Substitute parts are identified to address inventory availability, supply chain continuity, and equivalent functional performance across the TLP521 series.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP521BLSM
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	200% @ 1mA
Current Transfer Ratio (Max)	600% @ 1mA
Output Type	Transistor
Voltage - Output (Max)	55V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-30°C ~ 100°C
Package / Case	4-SMD (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the TLP521BLSM are qualified based on strict parametric equivalence within the following critical criteria:

Isolation and Safety: Voltage isolation rating of 5300Vrms is maintained across all substitutes.

Switching Performance: Current transfer ratio range (200% to 600% @ 1mA), output voltage maximum (55V), and output current per channel (50mA) are identical across all qualified substitutes.

Saturation Characteristics: Vce saturation maximum of 400mV is consistent.

Thermal Operating Range: All substitutes operate across -30°C to 100°C.

Package Compatibility: All substitutes use 4-SMD (0.300", 7.62mm) surface mount packaging.

Regulatory Compliance: All substitutes maintain RoHS3 compliance and MSL Level 1 rating.

The three qualified substitutes—ISP521-1XBLSM, TLP521-1XBLSM, and TLP521XBLSM—differ only in series designation and minor timing specifications where explicitly noted, with no impact on functional substitution within the specified electrical and mechanical parameters.

Parameter Comparison

Parameter	TLP521BLSM	ISP521-1XBLSM	TLP521-1XBLSM	TLP521XBLSM
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Number of Channels	1	1	1	1
Current Transfer Ratio (Min)	200% @ 1mA	200% @ 1mA	200% @ 1mA	200% @ 1mA
Current Transfer Ratio (Max)	600% @ 1mA	600% @ 1mA	600% @ 1mA	600% @ 1mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	Not specified	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Output Type	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	55V	55V	55V	55V
Current - Output / Channel	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV
Operating Temperature	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Package / Case	4-SMD (0.300", 7.62mm)	4-SMD (0.300", 7.62mm)	4-SMD (0.300", 7.62mm)	4-SMD (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All three substitute parts—ISP521-1XBLSM, TLP521-1XBLSM, and TLP521XBLSM—are qualified as direct parametric equivalents to the TLP521BLSM based on identical electrical specifications, mechanical packaging, and regulatory compliance status. Each substitute maintains active product status with full RoHS3 compliance and MSL Level 1 rating.

Selection among these substitutes should be based on inventory availability and supply chain logistics. The ISP521-1XBLSM offers 1000 pieces in stock, the TLP521-1XBLSM provides 1138 pieces, and the TLP521XBLSM has 967 pieces available. All three are supplied in tube packaging and are suitable for immediate integration into surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can ISP521-1XBLSM, TLP521-1XBLSM, and TLP521XBLSM be used interchangeably with TLP521BLSM?

A: Yes. All three substitutes meet identical electrical and mechanical specifications across isolation voltage, current transfer ratio, output voltage and current ratings, saturation characteristics, operating temperature range, and 4-SMD package dimensions. All maintain RoHS3 compliance and MSL Level 1 rating.

Q: What is the difference between the substitute part numbers?

A: The substitutes differ in series designation (ISP521-1, TLP521-1, and TLP521) and minor timing specification documentation. The ISP521-1XBLSM does not specify turn-on/turn-off time values, while TLP521-1XBLSM and TLP521XBLSM provide complete timing data. These differences do not affect functional substitution within the specified electrical parameters.

Q: Are all substitutes available in the same packaging format?

A: Yes. All substitutes are supplied in tube packaging with identical 4-SMD (0.300", 7.62mm) surface mount package dimensions, ensuring compatibility with existing PCB layouts and assembly equipment.

Q: Do the substitutes maintain the same isolation rating?

A: Yes. All substitutes maintain the 5300Vrms isolation rating, ensuring equivalent galvanic isolation performance in high-voltage isolation applications.

Q: Are there any compliance or certification differences?

A: No. All substitutes are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 (unlimited moisture sensitivity) rating, matching the compliance profile of the TLP521BLSM.

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