TLP521-2G Equivalent & Substitute Parts

Part Overview

The TLP521-2G 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 in active production status with 10,380 units in stock. Substitute parts are identified based on matching electrical specifications, isolation ratings, channel configuration, and package compatibility to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP521-2G
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
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TLP521-2G are qualified based on the following critical parameters that determine functional equivalence:

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)
Current Transfer Ratio Range: 50% to 600% @ 5mA (all substitutes match)
Maximum Output Voltage: 55V (all substitutes match)
Maximum Output Current per Channel: 50mA (all substitutes match)
Vce Saturation: 400mV maximum (all substitutes match)
Operating Temperature Range: -30°C ~ 100°C (all substitutes match)
Mounting Type: Through Hole (all substitutes match)
RoHS Compliance: ROHS3 Compliant (all substitutes match)

All identified substitute parts maintain identical electrical performance characteristics and physical packaging, enabling direct replacement in circuit applications.

Parameter Comparison

Parameter	TLP521-2G	ISP521-2XG	ISP621-2XG	ISP621-2XGR	ISP621-2XGRG	TLP521-2XG
Manufacturer	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom
Series	TLP521-2	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
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)	10,380	996	810	1,059	1,155	1,055

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and mechanical compatibility with the TLP521-2G. Selection among these equivalents should be based on:

Product Status: All substitute parts are in active production status, ensuring continued availability and support.

Compliance Certifications: All substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the primary part.

Inventory Availability: The TLP521-2G maintains the highest inventory level at 10,380 units. Among substitutes, ISP621-2XGRG offers 1,155 units, ISP621-2XG offers 810 units, ISP521-2XG offers 996 units, and TLP521-2XG offers 1,055 units.

Series Designation: The TLP521-2 series (TLP521-2G and TLP521-2XG) and ISP series variants (ISP521-2XG and ISP621-2 variants) are all manufactured by Isocom Components 2004 LTD and provide identical performance parameters.

Frequently Asked Questions (FAQ)

Q: Can ISP521-2XG replace TLP521-2G directly in my circuit?

A: Yes. The ISP521-2XG is a parametric equivalent with identical isolation voltage (5300Vrms), channel count (2), output type (transistor), package (8-DIP), current transfer ratio range (50-600% @ 5mA), maximum output voltage (55V), output current per channel (50mA), and operating temperature range (-30°C ~ 100°C). Direct substitution is supported.

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

A: All three ISP621-2 variants maintain identical electrical specifications and package configuration. The suffix designations (XG, XGR, XGRG) represent different packaging or marking variations from Isocom Components 2004 LTD but do not affect electrical performance or functional compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts, including TLP521-2G, ISP521-2XG, ISP621-2XG, ISP621-2XGR, ISP621-2XGRG, and TLP521-2XG, are ROHS3 compliant and REACH unaffected.

Q: Can I use these parts interchangeably on a PCB designed for 8-DIP through-hole mounting?

A: Yes. All substitute parts use the 8-DIP (0.400", 10.16mm) package with through-hole mounting, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What is the maximum isolation voltage rating for these optoisolators?

A: All parts in this equivalence group provide 5300Vrms isolation voltage, which is the specified isolation rating for this product category.

Q: Are there any differences in rise and fall times between the main part and substitutes?

A: The TLP521-2XG specifies turn-on/turn-off time of 3µs with rise/fall times of 4µs and 3µs. Other substitute parts do not specify turn-on/turn-off time but maintain identical rise/fall times of 4µs and 3µs, ensuring consistent switching performance.

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