ISP621-2GR Equivalent & Substitute Parts

Part Overview

The ISP621-2GR 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 in active production status with 914 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same product category, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISP621-2GR
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
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the ISP621-2GR are qualified based on strict equivalence across the following critical parameters:

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

All identified substitute parts maintain identical electrical performance specifications and physical form factors, enabling direct pin-compatible replacement.

Parameter Comparison

Parameter	ISP621-2GR	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
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.15V	1.15V
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)	914	996	810	1059	1155	1055

Engineering Selection Recommendations

All identified substitute parts maintain full electrical and mechanical equivalence to the ISP621-2GR. Selection among these alternatives is based on availability and supply chain considerations:

ISP521-2XG: Parametric equivalent from the ISP521 series with 996 units in stock. Suitable for direct replacement with identical performance characteristics.

ISP621-2XG: Same series variant with 810 units available. Maintains all critical specifications for seamless substitution.

ISP621-2XGR: ISP621 series variant with enhanced inventory (1059 units). Provides equivalent functionality with improved availability.

ISP621-2XGRG: ISP621 series variant with highest inventory level (1155 units). Recommended for high-volume applications requiring consistent supply.

TLP521-2XG: Cross-series equivalent from the TLP521 family with 1055 units in stock. Delivers identical electrical performance with alternative series designation.

All substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the ISP621-2GR.

Frequently Asked Questions (FAQ)

Q: Can ISP521-2XG replace ISP621-2GR in existing designs?

A: Yes. ISP521-2XG maintains identical electrical specifications including 5300Vrms isolation, dual-channel configuration, 50-600% current transfer ratio, and 8-DIP through-hole packaging. Direct pin-compatible replacement is supported.

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

A: Both parts are electrically and mechanically identical. The suffix variation indicates packaging or tape/reel configuration differences. Both are suitable substitutes with equivalent performance.

Q: Is TLP521-2XG compatible with ISP621-2GR applications?

A: Yes. TLP521-2XG provides identical electrical performance across all critical parameters: 5300Vrms isolation, 2-channel transistor output, 50mA per channel, and 8-DIP form factor. Series designation difference does not affect functional compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the ISP621-2GR.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. All substitute parts share identical 8-DIP (0.400", 10.16mm) through-hole packaging and pin configuration, enabling direct PCB footprint compatibility without layout modifications.

Q: Which substitute part offers the best availability?

A: ISP621-2XGRG provides the highest inventory level at 1155 units, followed by ISP621-2XGR at 1059 units. Both are suitable for applications requiring consistent supply.

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