TLP521-1G Optoisolator Equivalent & Substitute Parts

Part Overview

The TLP521-1G is a single-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 4-DIP through-hole component provides 5300Vrms isolation and is designed for DC input applications requiring galvanic isolation in industrial and consumer electronics. The part maintains Active product status with 2300 units in current inventory. Substitute parts are identified based on matching electrical performance parameters, mechanical compatibility, and regulatory compliance to support design flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP521-1G
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Number of Channels	1
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	4-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TLP521-1G are qualified based on the following critical parameters that determine functional equivalence:

Electrical Equivalence Criteria:

Voltage - Isolation: 5300Vrms (mandatory match)
Number of Channels: 1 (mandatory match)
Current Transfer Ratio range: 50% to 600% @ 5mA (mandatory match)
Output Type: Transistor (mandatory match)
Voltage - Output (Max): 55V (mandatory match)
Current - Output / Channel: 50mA (mandatory match)
Vce Saturation (Max): 400mV (mandatory match)
Input Type: DC (mandatory match)

Mechanical Equivalence Criteria:

Package / Case: 4-DIP (0.400", 10.16mm) (mandatory match)
Mounting Type: Through Hole (mandatory match)

Regulatory Equivalence Criteria:

RoHS Status: ROHS3 Compliant (mandatory match)
Moisture Sensitivity Level: 1 (Unlimited) (mandatory match)

All substitute parts listed maintain identical electrical performance specifications, mechanical form factor, and regulatory compliance status. Variations in Turn On/Turn Off Time and Rise/Fall Time specifications do not disqualify substitution when other critical parameters align, as these timing characteristics remain within acceptable operational ranges for the application class.

Parameter Comparison

Part Number	Manufacturer	Series	Isolation Voltage	Channels	CTR Min / Max	Output Type	Vce Sat (Max)	Output Current	Package	Temp Range	RoHS	Inventory
TLP521-1G	Isocom	TLP521-1	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	2300
ISP521-1XG	Isocom	ISP521-1	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	789
ISP621-1XG	Isocom	ISP621-1	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	1250
ISP621-1XGR	Isocom	ISP621-1	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	769
ISP621-1XGRG	Isocom	ISP621-1	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	1003
TLP521-1XG	Isocom	TLP521-1	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	796
TLP521XG	Isocom	TLP521	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	1085
TLP621XBLG	Isocom	TLP621	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	1074
TLP621XG	Isocom	TLP621	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	893
TLP621XGBG	Isocom	TLP621	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	3102
TLP621XGR	Isocom	TLP621	5300Vrms	1	50% / 600%	Transistor	400mV	50mA	4-DIP	-30°C ~ 100°C	ROHS3	842

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the TLP521-1G. Selection among equivalent parts should be based on inventory availability and packaging format requirements. ISP621-1XGRG, TLP621XGBG, and TLP621XG offer the highest inventory levels (1003, 3102, and 893 units respectively), supporting supply chain continuity. Parts designated with tube packaging (ISP and TLP621 variants) provide alternative packaging options to the standard format. The TLP521-1 and TLP521 series variants maintain identical electrical specifications and mechanical compatibility, differing only in packaging designation and series nomenclature.

Frequently Asked Questions (FAQ)

Q: Can I substitute TLP521-1G with ISP521-1XG? A: Yes. Both parts share identical electrical specifications (5300Vrms isolation, 50-600% CTR, 400mV Vce saturation, 50mA output current), operate across the same temperature range (-30°C to 100°C), use the same 4-DIP package, and maintain ROHS3 compliance. The primary difference is series designation and packaging format.

Q: What is the difference between TLP621 and TLP521 series substitutes? A: Both series meet all electrical equivalence criteria for the TLP521-1G. The TLP621 variants (TLP621XG, TLP621XBLG, TLP621XGBG, TLP621XGR) are functionally interchangeable with TLP521 variants. Series designation reflects manufacturer product line organization but does not affect electrical performance or mechanical compatibility.

Q: Are ISP621-1 parts equivalent to TLP521-1G? A: Yes. ISP621-1XG, ISP621-1XGR, and ISP621-1XGRG all meet the mandatory equivalence criteria: 5300Vrms isolation, single channel, 50-600% CTR, transistor output, 400mV Vce saturation, 50mA output current, 4-DIP package, and ROHS3 compliance.

Q: Does packaging format affect substitution eligibility? A: No. All substitute parts use identical 4-DIP (0.400", 10.16mm) through-hole packages. Packaging designation suffixes (such as "G" or "GR") indicate tape/reel or tube formats but do not alter electrical performance or mechanical fit.

Q: Which substitute part has the best inventory availability? A: TLP621XGBG offers the highest inventory level at 3102 units, followed by ISP621-1XG at 1250 units and TLP621XG at 893 units.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the regulatory status of the TLP521-1G.

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