TLP521-1XG Equivalent & Substitute Parts

Part Overview

The TLP521-1XG 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 control, power management, and signal conditioning circuits. The part maintains active product status with 796 units in current inventory. Substitute parts are identified based on matching electrical performance parameters, mechanical compatibility, and regulatory compliance to ensure direct functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP521-1XG
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 TLP521-1XG are qualified based on the following critical parameters that determine functional equivalence:

Electrical Performance Criteria:

Voltage - Isolation: 5300Vrms (all substitutes match)
Number of Channels: 1 (all substitutes match)
Current Transfer Ratio: 50% (Min) @ 5mA and 600% (Max) @ 5mA (all substitutes match)
Output Type: Transistor (all substitutes match)
Voltage - Output (Max): 55V (all substitutes match)
Current - Output / Channel: 50mA (all substitutes match)
Vce Saturation (Max): 400mV (all substitutes match)
Input Type: DC (all substitutes match)
Voltage - Forward (Vf) (Typ): 1.15V (all substitutes match)
Current - DC Forward (If) (Max): 50mA (all substitutes match)

Mechanical & Environmental Criteria:

Package / Case: 4-DIP (0.400", 10.16mm) (all substitutes match)
Mounting Type: Through Hole (all substitutes match)
Operating Temperature: -30°C ~ 100°C (all substitutes match)
Moisture Sensitivity Level (MSL): 1 (Unlimited) (all substitutes match)

Regulatory & Compliance Criteria:

RoHS Status: ROHS3 Compliant (all substitutes match)
REACH Status: REACH Unaffected (all substitutes match)
ECCN: EAR99 (all substitutes match)
HTSUS: 8541.49.8000 (all substitutes match)

All identified substitute parts meet these criteria and are therefore electrically, mechanically, and functionally equivalent to the TLP521-1XG.

Parameter Comparison

Part Number	Series	Isolation Voltage	CTR Min / Max	Turn On/Off Time (Typ)	Rise/Fall Time (Typ)	Output Voltage (Max)	Output Current	Vce Sat (Max)	Temp Range	Inventory
TLP521-1XG	TLP521-1	5300Vrms	50% / 600%	3µs, 3µs	4µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	796 Pcs
ISP521-1XG	ISP521-1	5300Vrms	50% / 600%	—	4µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	789 Pcs
ISP621-1XG	ISP621-1	5300Vrms	50% / 600%	—	4µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	1250 Pcs
ISP621-1XGR	ISP621-1	5300Vrms	50% / 600%	—	4µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	769 Pcs
ISP621-1XGRG	ISP621-1	5300Vrms	50% / 600%	—	4µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	1003 Pcs
TLP521XG	TLP521	5300Vrms	50% / 600%	3µs, 3µs	4µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	1085 Pcs
TLP621XBLG	TLP621	5300Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	1074 Pcs
TLP621XG	TLP621	5300Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	893 Pcs
TLP621XGBG	TLP621	5300Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	3102 Pcs
TLP621XGR	TLP621	5300Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	842 Pcs
TLP621XGRG	TLP621	5300Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	55V	50mA	400mV	-30°C ~ 100°C	816 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain active product status and full compliance with ROHS3, REACH, and regulatory classifications (ECCN: EAR99, HTSUS: 8541.49.8000). Selection among equivalent parts should be based on:

Availability: ISP621-1XG offers the highest inventory level at 1250 units, followed by TLP621XGBG at 3102 units, providing supply chain flexibility.

Series Compatibility: TLP521-1XG and TLP521XG share identical series designation and timing specifications (3µs turn-on/off, 4µs/3µs rise/fall times). ISP521-1XG provides an alternative within the ISP521 series with matching electrical performance but unspecified timing parameters.

Timing Performance: TLP621 series variants (TLP621XBLG, TLP621XG, TLP621XGBG, TLP621XGR, TLP621XGRG) feature improved rise time performance at 2µs versus 4µs in TLP521 variants, while maintaining identical turn-on/off times of 3µs. ISP621 series variants do not specify turn-on/off timing.

Packaging Variants: All parts utilize identical 4-DIP through-hole packaging (0.400", 10.16mm) with MSL rating of 1 (Unlimited), ensuring mechanical interchangeability in PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can I substitute TLP521-1XG with any of the listed parts?

A: Yes. All listed parts meet identical electrical specifications for isolation voltage (5300Vrms), current transfer ratio (50–600% @ 5mA), output voltage (55V max), output current (50mA), and saturation voltage (400mV max). All share the same 4-DIP through-hole package and operating temperature range (-30°C to 100°C).

Q: What is the difference between TLP521 and TLP621 series substitutes?

A: The primary difference is rise time performance. TLP621 variants specify 2µs rise time compared to 4µs in TLP521 variants. Both maintain 3µs turn-on and turn-off times. This faster rise time in TLP621 may benefit high-speed switching applications, though both meet the same maximum electrical ratings.

Q: Are ISP521 and ISP621 series parts equivalent to TLP521-1XG?

A: Electrically, yes. ISP521-1XG and ISP621 variants match all critical electrical parameters. However, ISP series parts do not specify turn-on/off timing values, whereas TLP series parts document 3µs timing. If timing specifications are critical to your application, TLP series parts provide explicit performance data.

Q: Does package type differ among substitutes?

A: No. All substitute parts use the same 4-DIP (0.400", 10.16mm) through-hole package with identical pin configuration and mechanical footprint, ensuring direct PCB compatibility.

Q: Are all substitutes RoHS and REACH compliant?

A: Yes. All listed parts carry ROHS3 compliance and REACH Unaffected status, with identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications.

Q: Which substitute offers the best inventory availability?

A: TLP621XGBG provides the highest stock level at 3102 units, followed by ISP621-1XG at 1250 units. Both maintain active product status and full regulatory compliance.

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