TLP621-4GR Equivalent & Substitute Parts

Part Overview

The TLP621-4GR is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-DIP through-hole component provides 5300Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation. The part is currently active in production with 3055 units in stock. Substitute parts are identified based on matching electrical specifications, isolation ratings, channel configuration, and package compatibility to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP621-4GR
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
Output Type	Transistor
Voltage - Output (Max)	55V
Current - Output / Channel	50mA
Package / Case	16-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
Operating Temperature	-30°C ~ 100°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TLP621-4GR are qualified based on the following critical parameters that determine functional equivalence:

Isolation Voltage: 5300Vrms (all substitutes match)
Number of Channels: 4 channels (all substitutes match)
Output Type: Transistor output (all substitutes match)
Package Configuration: 16-DIP through-hole (all substitutes match)
Current Transfer Ratio Range: 50% to 600% @ 5mA (all substitutes match)
Maximum Output Voltage: 55V (all substitutes match)
Maximum Output Current per Channel: 50mA (all substitutes match)
Operating Temperature Range: -30°C ~ 100°C (all substitutes match)
Compliance: ROHS3 Compliant, REACH Unaffected (all substitutes match)

The substitute parts represent different series designations (ISP521-4, ISP621-4, TLP521-4) and packaging variants (XG, XGR, XGRG) within the same manufacturer's optoisolator product family. All substitutes maintain identical electrical performance specifications and mechanical compatibility.

Parameter Comparison

Parameter	TLP621-4GR	ISP521-4XG	ISP621-4XG	ISP621-4XGR	ISP621-4XGRG	TLP521-4XG
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
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.15V	1.15V
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
Inventory (Pcs)	3055	948	935	875	631	1171

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the TLP621-4GR. Selection among these alternatives should be 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 and REACH unaffected status, matching the regulatory requirements of the primary part.

Packaging Variants: The XG, XGR, and XGRG designations indicate different packaging configurations. Selection should align with specific procurement or assembly requirements.

Timing Specifications: The TLP621-4GR specifies turn-on/turn-off times of 3µs and rise/fall times of 2µs/3µs. Substitute parts do not specify turn-on/turn-off times but provide rise/fall times of 4µs/3µs. Applications with critical timing requirements should evaluate this difference.

Inventory Availability: Current stock levels vary across substitute parts, ranging from 631 to 3055 units. Selection may be influenced by immediate availability needs.

Frequently Asked Questions (FAQ)

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

A: Yes. The ISP521-4XG matches all critical electrical parameters including isolation voltage (5300Vrms), channel count (4), output type (transistor), current transfer ratio range (50-600% @ 5mA), maximum output voltage (55V), and output current per channel (50mA). Both use identical 16-DIP through-hole packaging and operate across the same temperature range (-30°C ~ 100°C).

Q: What is the difference between ISP621-4XG, ISP621-4XGR, and ISP621-4XGRG?

A: These part numbers represent the same ISP621-4 series optoisolator with different packaging variants. The XG, XGR, and XGRG suffixes indicate packaging configuration differences. All three maintain identical electrical specifications and 16-DIP form factor compatibility.

Q: Are there timing differences between TLP621-4GR and the substitute parts?

A: The TLP621-4GR specifies turn-on/turn-off times of 3µs and rise/fall times of 2µs/3µs. Substitute parts do not specify turn-on/turn-off times but list rise/fall times of 4µs/3µs. Applications with timing-critical circuits should evaluate whether the rise/fall time difference of 2µs impacts performance.

Q: Do all substitute parts have the same RoHS and REACH compliance?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the TLP621-4GR.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. All parts use the 16-DIP (0.400", 10.16mm) through-hole package, enabling direct pin-compatible substitution on existing PCB layouts without design modification.

Q: Which substitute part has the highest current inventory?

A: The TLP521-4XG has the highest inventory at 1171 units, followed by the primary TLP621-4GR at 3055 units.

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