TLP521-4G Optoisolator Equivalent & Substitute Parts

Part Overview

The TLP521-4G is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-pin DIP component provides 5300Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation. The part is currently in active production status with 2400 units in stock. Substitute parts are identified based on matching electrical specifications, isolation ratings, channel configuration, and package compatibility to ensure direct functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP521-4G
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
Input Type	DC
Output Type	Transistor
Voltage - Output (Max)	55V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.15V
Current - DC Forward (If) (Max)	50 mA
Vce Saturation (Max)	400mV
Operating Temperature	-30°C ~ 100°C
Mounting Type	Through Hole
Package / Case	16-DIP (0.400", 10.16mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8541.49.8000

Substitute Part Grouping Explanation

Substitute parts for the TLP521-4G are qualified based on the following critical parameters that determine functional equivalence:

4-channel configuration with transistor output topology
5300Vrms isolation voltage rating
Current transfer ratio range: 50% to 600% @ 5mA
Rise/Fall time specifications: 4µs and 3µs
Maximum output voltage of 55V per channel
Maximum output current of 50mA per channel
Vce saturation maximum of 400mV
Operating temperature range of -30°C to 100°C
16-DIP through-hole package with 0.400" (10.16mm) pitch
ROHS3 compliance and MSL Level 1 rating

All substitute parts listed maintain identical electrical performance characteristics and package specifications, enabling direct replacement in existing circuit designs without modification.

Parameter Comparison

Parameter	TLP521-4G	ISP521-4XG	TLP521-4XG	ISP621-4XG	ISP621-4XGR	ISP621-4XGRG
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
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	50 mA	50 mA	50 mA	50 mA	50 mA	50 mA
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)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed are manufactured by Isocom Components 2004 LTD and maintain active production status. Each part carries ROHS3 compliance certification and REACH Unaffected status, meeting current environmental and regulatory requirements. The ISP521-4XG, TLP521-4XG, ISP621-4XG, ISP621-4XGR, and ISP621-4XGRG are direct parametric equivalents to the TLP521-4G with identical electrical specifications and package configuration.

Selection between the main part and substitutes may be based on packaging format availability (tube packaging for substitute variants versus standard packaging for TLP521-4G) and current inventory levels. All parts are suitable for applications requiring quad-channel galvanic isolation with 5300Vrms rating and transistor output topology.

Frequently Asked Questions (FAQ)

Q: Can ISP521-4XG replace TLP521-4G in existing designs? A: Yes. ISP521-4XG is a parametric equivalent with identical electrical specifications, isolation voltage, channel configuration, output characteristics, and 16-DIP package dimensions. Direct substitution is supported without circuit modification.

Q: What is the difference between TLP521-4XG and ISP621-4XG? A: Both parts are parametric equivalents to TLP521-4G with identical electrical performance. The difference lies in series designation (TLP521-4 versus ISP621-4) and packaging format (tube). All electrical parameters, isolation ratings, and package dimensions remain identical.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts, including TLP521-4G, ISP521-4XG, TLP521-4XG, ISP621-4XG, ISP621-4XGR, and ISP621-4XGRG, carry ROHS3 compliance certification and are REACH Unaffected.

Q: What does MSL Level 1 mean for these optoisolators? A: MSL Level 1 indicates unlimited shelf life with no moisture sensitivity restrictions. These parts do not require special moisture control during storage or handling.

Q: Can these parts be used interchangeably in PCB designs? A: Yes. All substitute parts share the identical 16-DIP (0.400", 10.16mm) through-hole package configuration, enabling direct PCB footprint compatibility and pin-for-pin replacement.

Q: What inventory levels are available for each part? A: TLP521-4G: 2400 units; ISP521-4XG: 948 units; TLP521-4XG: 1171 units; ISP621-4XG: 935 units; ISP621-4XGR: 875 units; ISP621-4XGRG: 631 units.

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