ISP621-2G Equivalent & Substitute Parts

Part Overview

The ISP621-2G 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 with transistor-based switching outputs. The part is currently in active production status with 688 units in stock. Substitute parts are identified based on matching electrical specifications, mechanical compatibility, and compliance certifications to ensure direct functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISP621-2G
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 ISP621-2G are qualified based on the following critical parameters that determine functional equivalence:

Number of Channels: 2 channels (dual configuration)
Voltage - Isolation: 5300Vrms minimum
Current Transfer Ratio: 50% minimum @ 5mA input
Output Type: Transistor output configuration
Maximum Output Voltage: 55V
Maximum Output Current: 50mA per channel
Package / Case: 8-DIP (0.400", 10.16mm)
Mounting Type: Through Hole
Operating Temperature Range: -30°C ~ 100°C
Compliance: ROHS3 Compliant, MSL 1

All substitute parts listed maintain identical electrical performance specifications and mechanical compatibility with the ISP621-2G, ensuring direct pin-for-pin and functional replacement capability.

Parameter Comparison

Parameter	ISP621-2G	ISP521-2XG	ISP621-2XG	ISP621-2XGR	ISP621-2XGRG	TLP521-2XG
Manufacturer	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD
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)
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active production status with Isocom Components 2004 LTD and carry identical ROHS3 compliance and MSL 1 certifications. Selection among ISP621-2G, ISP521-2XG, ISP621-2XG, ISP621-2XGR, ISP621-2XGRG, and TLP521-2XG is determined by availability and inventory levels rather than electrical or mechanical differences. Current inventory availability is as follows: ISP621-2XGRG (1155 units), ISP621-2XGR (1059 units), TLP521-2XG (1055 units), ISP521-2XG (996 units), ISP621-2XG (810 units), and ISP621-2G (688 units). All parts are suitable for direct substitution in applications requiring dual-channel optoisolation at 5300Vrms with transistor output switching.

Frequently Asked Questions (FAQ)

Q: Can ISP521-2XG replace ISP621-2G directly? A: Yes. ISP521-2XG is a parametric equivalent with identical electrical specifications, isolation voltage, output current rating, and 8-DIP package configuration. Direct pin-for-pin substitution is supported.

Q: What is the difference between ISP621-2XG and ISP621-2XGR? A: Both parts share identical electrical and mechanical specifications. The suffix variation indicates packaging or tape/reel configuration differences only. Functional performance and pin compatibility remain unchanged.

Q: Is TLP521-2XG compatible with ISP621-2G applications? A: Yes. TLP521-2XG meets all electrical requirements including 5300Vrms isolation, dual-channel transistor output, 50mA per channel current rating, and 8-DIP through-hole mounting. Turn-on/turn-off time specification (3µs, 3µs) is provided for this variant.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 moisture sensitivity rating, matching the ISP621-2G environmental and regulatory requirements.

Q: Can these parts be used in high-temperature applications? A: All parts support the operating temperature range of -30°C ~ 100°C. Applications requiring operation outside this range require alternative component selection.

Q: What is the significance of the 8-DIP package specification? A: The 8-DIP (0.400", 10.16mm) package ensures mechanical compatibility with existing PCB layouts and through-hole soldering processes. All substitute parts use identical package dimensions and pin spacing.

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