TLP621-4G Equivalent & Substitute Parts

Part Overview

The TLP621-4G is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-DIP through-hole component provides 5300Vrms isolation and is designed for DC input applications requiring galvanic isolation with transistor-based switching outputs. The part is currently active in production with 3445 units in stock. Substitute parts are identified based on matching electrical specifications, mechanical compatibility, and packaging standards to support component availability and supply chain flexibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP621-4G
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
Turn On / Turn Off Time (Typ)	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs
Output Type	Transistor
Voltage - Output (Max)	55V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-30°C ~ 100°C
Package / Case	16-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TLP621-4G are qualified based on the following criteria:

Electrical Compatibility:

Number of Channels: 4
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

Mechanical Compatibility:

Package / Case: 16-DIP (0.400", 10.16mm)
Mounting Type: Through Hole

Compliance & Certification:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected
Product Status: Active

All substitute parts maintain identical isolation voltage, channel count, output current rating, and package footprint. Variations in turn-on/turn-off time and rise/fall time do not affect substitution eligibility as these parameters remain within acceptable operational ranges for the optoisolator function class.

Parameter Comparison

Parameter	TLP621-4G	ISP521-4XG	ISP621-4XG	ISP621-4XGR	ISP621-4XGRG	TLP521-4XG
Manufacturer	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom
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
Turn On / Turn Off Time (Typ)	3µs, 3µs	—	—	—	—	—
Rise / Fall Time (Typ)	2µs, 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
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)
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)	3445	948	935	875	631	1171

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the TLP621-4G. Selection among these alternatives is based on:

Product Status: All parts are active in production, ensuring long-term availability and supply chain stability.

Compliance Certifications: All substitute parts carry ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating, matching the environmental and regulatory requirements of the primary part.

Packaging & Mounting: All parts use identical 16-DIP through-hole packaging, enabling direct board-level substitution without layout modifications.

Inventory Availability: TLP521-4XG offers the highest inventory level at 1171 units, followed by ISP521-4XG at 948 units. Selection may be driven by supply chain requirements and lead time considerations.

Frequently Asked Questions (FAQ)

Q: Can ISP521-4XG be used as a direct replacement for TLP621-4G?

A: Yes. ISP521-4XG meets all electrical specifications including 5300Vrms isolation, 4-channel configuration, 50% to 600% current transfer ratio, 55V maximum output voltage, and 50mA per-channel output current. The 16-DIP through-hole package is identical, enabling direct board substitution.

Q: What is the difference between TLP621-4G and ISP621-4XG?

A: Both parts share identical electrical ratings and package specifications. The primary difference is the series designation (TLP621-4 versus ISP621-4) and rise/fall time specification. TLP621-4G specifies 2µs rise time and 3µs fall time, while ISP621-4XG specifies 4µs rise time and 3µs fall time. Both values remain within acceptable operational ranges for optoisolator switching applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the environmental compliance status of the TLP621-4G.

Q: Can these parts be used interchangeably in high-speed switching applications?

A: All parts maintain the same maximum output current (50mA per channel), maximum output voltage (55V), and saturation voltage (400mV). Timing specifications vary slightly; TLP621-4G specifies 3µs turn-on/turn-off time with 2µs rise time, while substitute parts do not specify turn-on/turn-off time but specify 4µs rise time. Application requirements determine whether these timing differences are acceptable.

Q: What is the operating temperature range for all parts?

A: All parts operate across -30°C to 100°C, providing identical thermal performance specifications.

Q: Are there any package or pinout differences between these parts?

A: No. All parts use 16-DIP (0.400", 10.16mm) through-hole packaging with identical pinout and mounting requirements.

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