TLP621-2BLG Equivalent & Substitute Parts

Part Overview

The TLP621-2BLG is a dual-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 8-DIP through-hole component provides 5300Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation. The part is currently active in production with 1068 units in stock. Substitute parts are identified based on matching electrical specifications, isolation ratings, package configuration, and compliance certifications to ensure direct functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP621-2BLG
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Number of Channels	2
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	8-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the TLP621-2BLG are qualified based on the following critical parameters that determine functional equivalence:

Electrical Equivalence Criteria:

Number of Channels: 2 (dual-channel configuration)
Voltage - Isolation: 5300Vrms (isolation rating)
Current Transfer Ratio: 50% (Min) @ 5mA and 600% (Max) @ 5mA
Output Type: Transistor
Voltage - Output (Max): 55V
Current - Output / Channel: 50mA
Vce Saturation (Max): 400mV
Input Type: DC
Voltage - Forward (Vf) (Typ): 1.15V
Current - DC Forward (If) (Max): 50mA

Mechanical & Environmental Equivalence Criteria:

Package / Case: 8-DIP (0.400", 10.16mm)
Mounting Type: Through Hole
Operating Temperature: -30°C ~ 100°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain these specifications and are therefore suitable for direct replacement in applications designed for the TLP621-2BLG.

Parameter Comparison

Parameter	TLP621-2BLG	ISP521-2XG	ISP621-2XG	ISP621-2XGR	ISP621-2XGRG	TLP521-2XG
Manufacturer	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom
Number of Channels	2	2	2	2	2	2
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	55V	55V	55V	55V	55V	55V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	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	-30°C ~ 100°C
Package / Case	8-DIP (0.400", 10.16mm)	8-DIP (0.400", 10.16mm)	8-DIP (0.400", 10.16mm)	8-DIP (0.400", 10.16mm)	8-DIP (0.400", 10.16mm)	8-DIP (0.400", 10.16mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical equivalence to the TLP621-2BLG. Selection among these alternatives should be based on:

Product Availability: Current inventory levels vary across substitute parts. ISP621-2XGRG offers 1155 units, ISP621-2XGR provides 1059 units, TLP521-2XG has 1055 units, ISP621-2XG contains 810 units, and ISP521-2XG has 996 units in stock.

Compliance Status: All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and identical moisture sensitivity ratings, ensuring regulatory equivalence for applications requiring these certifications.

Series Designation: The TLP621-2BLG belongs to the TLP621-2 series, while ISP521-2XG belongs to the ISP521-2 series, and ISP621-2XG, ISP621-2XGR, and ISP621-2XGRG belong to the ISP621-2 series. Series designation does not affect functional substitution when all electrical parameters match.

Frequently Asked Questions (FAQ)

Q: Can ISP521-2XG replace TLP621-2BLG in all applications?

A: Yes. ISP521-2XG maintains identical electrical specifications including 5300Vrms isolation voltage, 50% to 600% current transfer ratio, 55V maximum output voltage, and 50mA per-channel output current. The 8-DIP through-hole package and operating temperature range are identical. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between ISP621-2XG, ISP621-2XGR, and ISP621-2XGRG?

A: These three parts are from the ISP621-2 series and share identical electrical and mechanical specifications. The suffix variations (XG, XGR, XGRG) indicate packaging or tape/reel configuration differences but do not affect functional performance or substitution capability.

Q: Is TLP521-2XG electrically equivalent to TLP621-2BLG?

A: Yes. TLP521-2XG provides the same isolation voltage (5300Vrms), current transfer ratio range (50% to 600% @ 5mA), output specifications (55V max, 50mA per channel), and saturation voltage (400mV max). Both use 8-DIP through-hole packaging and operate across -30°C to 100°C.

Q: Are all substitute parts suitable for PCB through-hole mounting?

A: Yes. All substitute parts use 8-DIP (0.400", 10.16mm) through-hole package configuration and are rated for identical mounting type, ensuring direct PCB compatibility without layout modifications.

Q: Do substitute parts require different lead times or certifications?

A: All substitute parts are manufactured by Isocom Components 2004 LTD and maintain identical compliance certifications: ROHS3 compliant, REACH Unaffected, and MSL 1 (Unlimited). Lead times may vary based on current inventory levels.

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