TLP521-1SMT&R Equivalent & Substitute Parts

Part Overview

The TLP521-1SMT&R is a single-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This surface-mount component provides 5300Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified based on matching electrical characteristics, isolation voltage, output specifications, and package compatibility to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP521-1SMT&R
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Series	TLP521-1
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
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 TLP521-1SMT&R are qualified based on the following critical parameters that determine functional equivalence:

Isolation Voltage: 5300Vrms (all substitutes match)
Number of Channels: 1 (single-channel configuration)
Output Type: Transistor output
Maximum Output Voltage: 55V
Maximum Output Current: 50mA per channel
Current Transfer Ratio Range: 50% to 600% @ 5mA
Package / Case: 4-SMD (0.300", 7.62mm)
Mounting Type: Surface Mount
Operating Temperature Range: -30°C ~ 100°C
Compliance: RoHS3 Compliant, MSL 1

All identified substitute parts maintain these core electrical and mechanical specifications, ensuring direct circuit compatibility without design modification.

Parameter Comparison

Parameter	TLP521-1SMT&R	ISP521-1XSMT&R	TLP521-1XSMT&R	TLP621XBLSMT&R	TLP621XGBXSMT&R
Manufacturer	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD
Series	TLP521-1	ISP521-1	TLP521-1	TLP621	TLP621
Number of Channels	1	1	1	1	1
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	—	3µs, 3µs	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs	2µs, 3µs	2µs, 3µs
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	55V	55V	55V	55V	55V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-30°C ~ 100°C	-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)	4-SMD (0.300", 7.62mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed maintain active production status with full RoHS3 compliance and REACH unaffected certification. Selection between TLP521-1SMT&R and its substitutes depends on availability and application-specific timing requirements:

TLP521-1XSMT&R and TLP521-1SMT&R are functionally identical within the TLP521-1 series, differing only in packaging designation. Both provide 3µs turn-on and turn-off times with 4µs and 3µs rise and fall times respectively.

ISP521-1XSMT&R is a parametric equivalent from the ISP521-1 series with identical electrical specifications. Turn-on and turn-off time data is not specified for this variant, but all other critical parameters match the main part.

TLP621XBLSMT&R and TLP621XGBXSMT&R are from the TLP621 series and provide improved switching performance with 2µs rise time compared to 4µs in the TLP521-1 series, while maintaining all other electrical and mechanical specifications. These parts are suitable for applications requiring faster output transitions.

All parts are manufactured by Isocom Components 2004 LTD and carry identical isolation voltage, output current, and temperature operating range specifications.

Frequently Asked Questions (FAQ)

Q: Can TLP621XBLSMT&R and TLP621XGBXSMT&R be used as direct replacements for TLP521-1SMT&R?

A: Yes. Both TLP621 variants meet all electrical and mechanical requirements of the TLP521-1SMT&R. The primary difference is improved rise time performance (2µs versus 4µs). Applications sensitive to output transition speed benefit from this improvement, while applications with relaxed timing requirements experience no functional difference.

Q: What is the difference between ISP521-1XSMT&R and TLP521-1SMT&R?

A: Both parts are parametric equivalents with matching isolation voltage, output specifications, and package dimensions. The ISP521-1XSMT&R does not specify turn-on and turn-off time values, but all other critical electrical parameters are identical. Both are suitable for DC input optoisolation applications.

Q: Are all substitute parts in the same 4-SMD package?

A: Yes. All substitute parts use the 4-SMD (0.300", 7.62mm) package with surface-mount configuration, ensuring PCB layout compatibility without modification.

Q: Do all parts meet the same compliance standards?

A: Yes. All listed parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating. All parts are active in production status.

Q: What is the maximum isolation voltage for all these parts?

A: All parts provide 5300Vrms isolation voltage, meeting high-voltage isolation requirements in industrial and power management applications.

Q: Can these parts handle the same output current?

A: Yes. All substitute parts support 50mA maximum output current per channel with 55V maximum output voltage and 400mV maximum Vce saturation voltage.

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