TLP621-2G Equivalent & Substitute Parts

Part Overview

The TLP621-2G is a dual-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 8-DIP through-hole component provides 5300Vrms isolation and is designed for DC input applications requiring galvanic isolation in industrial and consumer electronics. The part is currently active in production with 699 units in stock. Substitute parts are identified based on matching electrical specifications, isolation voltage, channel configuration, and package compatibility to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP621-2G
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Number of Channels	2
Voltage - Isolation	5300Vrms
Output Type	Transistor
Voltage - Output (Max)	55V
Current - Output / Channel	50mA
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
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
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TLP621-2G are qualified based on the following critical parameters:

Isolation Voltage: 5300Vrms (all substitutes match)
Number of Channels: 2 (all substitutes match)
Output Type: Transistor (all substitutes match)
Package / Case: 8-DIP (0.400", 10.16mm) (all substitutes match)
Mounting Type: Through Hole (all substitutes match)
Voltage - Output (Max): 55V (all substitutes match)
Current - Output / Channel: 50mA (all substitutes match)
Current Transfer Ratio Range: 50% to 600% @ 5mA (all substitutes match)
Vce Saturation (Max): 400mV (all substitutes match)
Operating Temperature: -30°C ~ 100°C (all substitutes match)
RoHS Status: ROHS3 Compliant (all substitutes match)

All five substitute parts maintain identical electrical performance specifications and physical packaging, enabling direct replacement in existing circuit designs without modification.

Parameter Comparison

Parameter	TLP621-2G	ISP521-2XG	ISP621-2XG	ISP621-2XGR	ISP621-2XGRG	TLP521-2XG
Manufacturer	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom
Series	TLP621-2	ISP521-2	ISP621-2	ISP621-2	ISP621-2	TLP521-2
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
Turn On / Turn Off Time (Typ)	3µs, 3µs	—	—	—	—	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
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
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	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
Product Status	Active	Active	Active	Active	Active	Active
Inventory (Pcs)	699	996	810	1059	1155	1055

Engineering Selection Recommendations

All substitute parts are active products with ROHS3 compliance and REACH unaffected status, matching the regulatory and environmental requirements of the TLP621-2G. Selection among the five qualified substitutes should be based on inventory availability and lead time requirements:

ISP621-2XGRG: Highest inventory (1155 units)
ISP621-2XGR: 1059 units available
TLP521-2XG: 1055 units available
ISP521-2XG: 996 units available
ISP621-2XG: 810 units available

All parts maintain identical electrical performance and physical form factor, ensuring functional equivalence in circuit applications. The TLP521-2XG variant shares the same turn-on/turn-off timing specification (3µs, 3µs) as the primary TLP621-2G part, while ISP series variants do not specify this parameter but maintain all other critical electrical characteristics.

Frequently Asked Questions (FAQ)

Q: Can ISP521-2XG, ISP621-2XG, ISP621-2XGR, ISP621-2XGRG, and TLP521-2XG be used interchangeably with TLP621-2G?

A: Yes. All five substitute parts maintain identical isolation voltage (5300Vrms), channel configuration (2 channels), output type (transistor), package format (8-DIP), and electrical performance specifications including current transfer ratio, output voltage, and saturation voltage. Direct substitution is supported without circuit modification.

Q: What is the difference between the TLP621-2G and TLP521-2XG?

A: Both parts share the TLP series designation and identical turn-on/turn-off timing (3µs, 3µs). The TLP521-2XG has a slightly different rise/fall time specification (4µs, 3µs versus 2µs, 3µs for TLP621-2G), but all other electrical parameters are equivalent. Both are suitable for direct replacement.

Q: Why do ISP series parts not specify turn-on/turn-off time?

A: The ISP521-2XG, ISP621-2XG, ISP621-2XGR, and ISP621-2XGRG parts do not include turn-on/turn-off time in their published specifications. However, they maintain all other critical electrical parameters identical to the TLP621-2G, including rise/fall time, current transfer ratio, isolation voltage, and output characteristics.

Q: Are all substitute parts through-hole mounted in 8-DIP packages?

A: Yes. All substitute parts use identical through-hole mounting with 8-DIP package format (0.400", 10.16mm), ensuring compatibility with existing PCB layouts and assembly processes.

Q: Do all parts meet the same compliance standards?

A: Yes. All substitute parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.49.8000, matching the regulatory status of the TLP621-2G.

Q: Which substitute part should I select if inventory is critical?

A: ISP621-2XGRG offers the highest inventory level (1155 units), followed by ISP621-2XGR (1059 units) and TLP521-2XG (1055 units). All three are immediately available for production use.

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