TLP521-1BLSM Equivalent & Substitute Parts

Part Overview

The TLP521-1BLSM is an optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This single-channel device provides 5300Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation. The component is currently in active production status with 859 units in stock. Substitute parts are identified to support supply chain continuity and design flexibility while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP521-1BLSM
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)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

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

Single-channel configuration (Number of Channels: 1)
Isolation voltage rating (5300Vrms)
Current transfer ratio range (200% to 600% @ 1mA)
Transistor output type with maximum output voltage of 55V
Maximum output current of 50mA per channel
Vce saturation maximum of 400mV
Operating temperature range of -30°C to 100°C
4-SMD surface mount package (0.300", 7.62mm)
DC input type
ROHS3 compliance and MSL Level 1 rating

All substitute parts maintain these core electrical and mechanical specifications, ensuring direct replacement capability in existing circuit designs.

Parameter Comparison

Parameter	TLP521-1BLSM	ISP521-1XBLSM	TLP521-1XBLSM	TLP521XBLSM
Manufacturer	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD
Number of Channels	1	1	1	1
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms
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
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	50 mA	50 mA	50 mA	50 mA
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)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99

Engineering Selection Recommendations

All substitute parts listed maintain active product status with Isocom Components 2004 LTD and carry identical ROHS3 compliance and REACH unaffected certifications. The TLP521-1XBLSM and TLP521XBLSM variants provide complete parameter alignment with the primary TLP521-1BLSM part, including specified turn-on and turn-off timing characteristics. The ISP521-1XBLSM variant maintains all critical electrical parameters with the exception of turn-on and turn-off time specifications, which are not provided in the datasheet. Selection between these parts should be based on availability and specific timing requirements for the application circuit.

Frequently Asked Questions (FAQ)

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

A: The ISP521-1XBLSM is electrically equivalent across all specified isolation voltage, current transfer ratio, output voltage, output current, and saturation voltage parameters. The primary difference is that turn-on and turn-off time specifications are not provided for the ISP521-1XBLSM. If timing characteristics are critical to circuit operation, TLP521-1XBLSM or TLP521XBLSM are preferred alternatives.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the 4-SMD (0.300", 7.62mm) surface mount package with identical pin configuration and PCB footprint compatibility.

Q: What is the difference between TLP521-1BLSM, TLP521-1XBLSM, and TLP521XBLSM?

A: These parts differ only in series designation. TLP521-1BLSM and TLP521-1XBLSM belong to the TLP521-1 series, while TLP521XBLSM belongs to the TLP521 series. All three maintain identical electrical specifications and package configuration.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All parts are ROHS3 compliant, REACH unaffected, classified as EAR99, and carry MSL Level 1 (Unlimited) moisture sensitivity rating.

Q: What inventory levels are available for each part?

A: TLP521-1BLSM: 859 units; ISP521-1XBLSM: 1000 units; TLP521-1XBLSM: 1138 units; TLP521XBLSM: 967 units.

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