ISP521-2G Equivalent & Substitute Parts

Part Overview

The ISP521-2G 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 applications requiring galvanic isolation between input and output circuits. The part is currently active in production with 8280 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	ISP521-2G
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 ISP521-2G 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)
Package / Case: 8-DIP (0.400", 10.16mm) (mandatory match)
Mounting Type: Through Hole (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)
Vce Saturation: 400mV maximum (mandatory match)
Operating Temperature Range: -30°C ~ 100°C (mandatory match)
RoHS Compliance: ROHS3 Compliant (mandatory match)

All identified substitute parts maintain identical electrical performance characteristics and physical form factors, ensuring direct functional replacement without circuit modification.

Parameter Comparison

Parameter	ISP521-2G	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
Inventory (Pcs)	8280	996	810	1059	1155	1055

Engineering Selection Recommendations

All substitute parts listed maintain full parametric equivalence with the ISP521-2G across electrical performance, isolation characteristics, and physical form factor. Selection among these alternatives should be based on:

Product Availability: ISP521-2G offers the highest inventory level at 8280 units. ISP621-2XGRG provides the second-highest availability at 1155 units, followed by ISP621-2XGR at 1059 units.

Compliance Status: All parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8541.49.8000.

Series Designation: ISP521-2 series parts (ISP521-2G and ISP521-2XG) share the same series designation. ISP621-2 series parts (ISP621-2XG, ISP621-2XGR, ISP621-2XGRG) represent an alternative series within the same product family. TLP521-2XG represents a distinct series variant.

All parts are suitable for direct substitution in applications requiring dual-channel optoisolation at 5300Vrms with transistor output in 8-DIP through-hole packaging.

Frequently Asked Questions (FAQ)

Q: Can ISP521-2XG be used as a direct replacement for ISP521-2G?

A: Yes. ISP521-2XG maintains identical electrical parameters, isolation voltage, channel configuration, output characteristics, and 8-DIP package specifications. Direct substitution is supported without circuit modification.

Q: What is the difference between ISP521-2 series and ISP621-2 series parts?

A: Both series maintain identical electrical performance across all critical parameters including isolation voltage, current transfer ratio, output voltage and current ratings, and operating temperature range. The series designation reflects internal design variants within the same functional category. All are electrically equivalent for substitution purposes.

Q: Is TLP521-2XG compatible with ISP521-2G?

A: Yes. TLP521-2XG meets all parametric requirements for substitution, including 5300Vrms isolation, dual-channel transistor output, 50mA per-channel current capability, and 8-DIP through-hole packaging. The part number prefix reflects manufacturer or design variant classification but does not affect functional compatibility.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All listed substitute parts use 8-DIP (0.400", 10.16mm) through-hole packaging with identical pin configuration and mounting requirements.

Q: Do all substitute parts have the same compliance certifications?

A: Yes. All parts are ROHS3 compliant, REACH unaffected, and carry identical ECCN and HTSUS classifications.

Q: What is the minimum current transfer ratio specification?

A: All parts, including the main part and all substitutes, maintain a minimum current transfer ratio of 50% at 5mA input current, with maximum ratio of 600% at the same input level.

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

A: Yes. All substitute parts share identical 8-DIP through-hole package dimensions and pin assignments, enabling direct PCB compatibility without layout modification.

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