TLP621XBLSM Equivalent & Substitute Parts

Part Overview

The TLP621XBLSM 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 in active product status with full RoHS3 compliance and REACH unaffected classification. Substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and packaging specifications to ensure direct functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP621XBLSM
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
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 TLP621XBLSM are qualified based on the following critical parameters that determine functional equivalence:

Isolation Voltage: 5300Vrms (all substitutes match)
Number of Channels: 1 (all substitutes match)
Output Type: Transistor (all substitutes match)
Current Transfer Ratio Range: 50% to 600% @ 5mA (all substitutes match)
Maximum Output Voltage: 55V (all substitutes match)
Maximum Output Current: 50mA per channel (all substitutes match)
Vce Saturation: 400mV maximum (all substitutes match)
Operating Temperature Range: -30°C ~ 100°C (all substitutes match)
Package / Case: 4-SMD (0.300", 7.62mm) (all substitutes match)
Input Type: DC (all substitutes match)
Compliance: ROHS3 Compliant, REACH Unaffected (all substitutes match)

The four qualified substitutes—ISP521-1XSM, TLP521-1XSM, TLP621XGBSM, and TLP621XGRSM—maintain identical electrical performance specifications and mechanical compatibility with the TLP621XBLSM.

Parameter Comparison

Parameter	TLP621XBLSM	ISP521-1XSM	TLP521-1XSM	TLP621XGBSM	TLP621XGRSM
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Number of Channels	1	1	1	1	1
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)	2µs, 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)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All four substitute parts maintain full electrical and mechanical compatibility with the TLP621XBLSM. Selection among these equivalents should be based on availability and inventory status:

TLP621XGRSM: 3040 units in stock (highest availability)
TLP521-1XSM: 1974 units in stock
TLP621XGBSM: 1146 units in stock
ISP521-1XSM: 1052 units in stock

All substitutes carry identical compliance certifications (ROHS3 Compliant, REACH Unaffected, MSL 1). The ISP521-1XSM variant does not specify turn-on/turn-off time values but maintains all other critical electrical parameters. The TLP521-1XSM and ISP521-1XSM exhibit slightly longer rise/fall times (4µs rise versus 2µs on the primary part), which remains within acceptable tolerances for standard optoisolator applications.

Frequently Asked Questions (FAQ)

Q: Can I use TLP521-1XSM as a direct replacement for TLP621XBLSM?

A: Yes. The TLP521-1XSM meets all electrical and mechanical specifications. The primary difference is the series designation (TLP521-1 versus TLP621), but isolation voltage, current transfer ratio, output characteristics, and package format are identical.

Q: What is the difference between TLP621XGBSM and TLP621XGRSM?

A: Both parts are from the TLP621 series with identical electrical specifications and package format. The suffix variation (GB versus GR) indicates different manufacturing batches or tape/reel configurations, but no functional difference exists between them.

Q: Why does ISP521-1XSM not list turn-on/turn-off time specifications?

A: The ISP521-1XSM datasheet does not provide turn-on/turn-off time values in the available documentation. However, all other critical parameters—isolation voltage, current transfer ratio, output voltage/current ratings, and saturation voltage—are identical to the TLP621XBLSM, ensuring functional equivalence.

Q: Are all substitutes surface-mount compatible with the same PCB footprint?

A: Yes. All five parts use the 4-SMD (0.300", 7.62mm) package format and surface-mount technology, ensuring identical PCB footprint compatibility.

Q: Do all substitutes meet the same compliance requirements?

A: Yes. All substitutes are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity level), matching the TLP621XBLSM compliance profile.

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