ISP621-4G Equivalent & Substitute Parts

Part Overview

The ISP621-4G is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-pin DIP component provides galvanic isolation up to 5300Vrms across four independent channels, each capable of 50mA output current. The part is classified as Active status and is RoHS3 compliant. Substitute parts are identified based on matching electrical isolation ratings, channel configuration, output specifications, and package form factor to ensure direct functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISP621-4G
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Number of Channels	4
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Rise / Fall Time (Typ)	4µs, 3µs
Output Type	Transistor
Voltage - Output (Max)	55V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-30°C ~ 100°C
Package / Case	16-DIP (0.400", 10.16mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the ISP621-4G are qualified based on the following critical parameters that determine functional equivalence:

Number of Channels: 4 channels required
Voltage - Isolation: 5300Vrms minimum isolation rating
Output Type: Transistor output configuration
Current - Output / Channel: 50mA per channel capability
Voltage - Output (Max): 55V maximum output voltage
Package / Case: 16-DIP (0.400", 10.16mm) through-hole form factor
Current Transfer Ratio: 50% minimum @ 5mA, 600% maximum @ 5mA
Rise / Fall Time: 4µs rise, 3µs fall time specifications
Operating Temperature: -30°C ~ 100°C range
RoHS Status: ROHS3 Compliant

All substitute parts listed maintain identical electrical performance across isolation voltage, channel count, output current capacity, and switching characteristics. Package compatibility and compliance certifications are preserved across all equivalents.

Parameter Comparison

Parameter	ISP621-4G	ISP521-4XG	ISP621-4XG	ISP621-4XGR	ISP621-4XGRG	TLP521-4XG
Number of Channels	4	4	4	4	4	4
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
Rise / Fall Time (Typ)	4µs, 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
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	16-DIP (0.400", 10.16mm)	16-DIP (0.400", 10.16mm)	16-DIP (0.400", 10.16mm)	16-DIP (0.400", 10.16mm)	16-DIP (0.400", 10.16mm)	16-DIP (0.400", 10.16mm)
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 product status and ROHS3 compliance, ensuring continued availability and regulatory conformance. The ISP621-4G, ISP521-4XG, ISP621-4XG, ISP621-4XGR, ISP621-4XGRG, and TLP521-4XG are electrically and mechanically interchangeable within applications requiring quad-channel optoisolation at 5300Vrms with 50mA transistor output per channel in 16-DIP through-hole packaging.

Selection among these equivalents may be based on inventory availability and lead time considerations. Current stock levels range from 631 to 1171 pieces across the substitute options, with the ISP621-4G maintaining 1109 pieces in inventory.

Frequently Asked Questions (FAQ)

Q: Are all listed parts pin-compatible with the ISP621-4G?

A: Yes. All substitute parts use the 16-DIP (0.400", 10.16mm) through-hole package with identical pinout configuration, enabling direct board-level replacement without layout modifications.

Q: What determines if a part can substitute for the ISP621-4G?

A: Substitution is based on matching four-channel configuration, 5300Vrms isolation voltage, transistor output type, 50mA per-channel current capacity, 55V maximum output voltage, and identical switching characteristics (4µs rise, 3µs fall time). All listed parts meet these criteria.

Q: Can I use these parts interchangeably in production?

A: Yes. All substitute parts are Active status with ROHS3 compliance and MSL Level 1 rating, meeting the same regulatory and environmental requirements as the ISP621-4G.

Q: What is the difference between ISP621-4XG and ISP621-4XGR?

A: Both parts are electrically identical with matching isolation voltage, channel count, output specifications, and operating temperature range. Differences are limited to packaging variants and internal manufacturing designations that do not affect electrical performance or board compatibility.

Q: Is the TLP521-4XG equivalent to the ISP621-4G?

A: Yes. The TLP521-4XG maintains identical electrical specifications across isolation voltage, channel configuration, output current, switching time, and package form factor. The series designation difference (TLP521 vs ISP621) reflects manufacturer product line organization but does not indicate functional differences.

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