TLP621 Optoisolator Transistor Output Equivalent & Substitute Parts

Part Overview

The TLP621 is a single-channel optoisolator with transistor output, rated for 5300Vrms isolation voltage. Manufactured by Isocom Components 2004 LTD, this component is designed for applications requiring galvanic isolation between input and output circuits. The part is currently in active production status with 10,072 pieces in stock. Substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and compliance certifications to ensure direct functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP621
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 (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TLP621 are qualified based on the following critical parameters that determine functional equivalence:

Isolation Voltage: 5300Vrms (all substitutes match)
Number of Channels: 1 (all substitutes match)
Output Type: Transistor (all substitutes match)
Current Transfer Ratio Range: 50% to 600% @ 5mA (all substitutes match)
Maximum Output Voltage: 55V (all substitutes match)
Maximum Output Current: 50mA per channel (all substitutes match)
Vce Saturation: 400mV maximum (all substitutes match)
Operating Temperature Range: -30°C to 100°C (all substitutes match)
Package Type: 4-DIP (0.300", 7.62mm) (all substitutes match)
Mounting Type: Through Hole (all substitutes match)
Compliance: ROHS3 Compliant, REACH Unaffected (all substitutes match)

The identified substitutes—ISP521-1X, TLP521-1X, and TLP621XBL—maintain electrical and mechanical compatibility with the TLP621 across all critical parameters.

Parameter Comparison

Parameter	TLP621	ISP521-1X	TLP521-1X	TLP621XBL
Manufacturer	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD
Number of Channels	1	1	1	1
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	Not specified	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	4µs, 3µs	4µs, 3µs	2µs, 3µs
Output Type	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	55V	55V	55V	55V
Current - Output / Channel	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV
Operating Temperature	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All identified substitute parts—ISP521-1X, TLP521-1X, and TLP621XBL—are active production components manufactured by Isocom Components 2004 LTD. Each part maintains full compliance with ROHS3 standards and REACH regulations, ensuring regulatory equivalence with the TLP621.

The TLP621XBL variant shares identical timing characteristics (Turn On/Turn Off Time: 3µs, 3µs; Rise/Fall Time: 2µs, 3µs) with the original TLP621, making it the closest electrical match. The TLP521-1X also provides matching timing specifications. The ISP521-1X differs only in Rise/Fall Time (4µs, 3µs versus 2µs, 3µs), which remains within acceptable tolerance for most circuit applications while maintaining all other critical electrical parameters.

Selection among these substitutes should be based on availability, packaging preference (Tube packaging is standard for all substitutes), and specific timing requirements of the application circuit.

Frequently Asked Questions (FAQ)

Q: Can ISP521-1X be used as a direct replacement for TLP621?

A: Yes. The ISP521-1X is electrically equivalent to the TLP621 across all critical parameters including isolation voltage (5300Vrms), current transfer ratio (50-600% @ 5mA), output voltage (55V max), and output current (50mA). The only difference is Rise/Fall Time (4µs, 3µs versus 2µs, 3µs), which does not affect functional compatibility in standard applications.

Q: What is the difference between TLP521-1X and TLP621XBL?

A: Both parts are functionally equivalent to the TLP621. The TLP521-1X belongs to the TLP521-1 series, while TLP621XBL is a variant of the TLP621 series. Electrically, they are identical in all critical parameters. Selection between them depends on part availability and inventory management.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts—ISP521-1X, TLP521-1X, and TLP621XBL—are supplied in 4-DIP (0.300", 7.62mm) through-hole packages, identical to the TLP621. They are pin-compatible and can be used interchangeably on PCBs designed for the TLP621.

Q: Do the substitute parts meet the same compliance standards as the TLP621?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the TLP621. They carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications.

Q: Which substitute part should I choose if timing is critical?

A: If Turn On/Turn Off Time specifications are critical, select either TLP621XBL or TLP521-1X, both of which match the TLP621 specification (3µs, 3µs). The ISP521-1X does not specify Turn On/Turn Off Time but provides matching Rise/Fall Time of 3µs on the fall edge.

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