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ISP621-1G Optoisolator Equivalent & Substitute Parts
Part Overview
The ISP621-1G is a single-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 4-DIP through-hole component provides 5300Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation in industrial and consumer electronics. The part is currently active in production with 693 units in stock. Substitute parts are necessary to address supply chain variations, packaging preferences, and performance optimization across equivalent product lines within the ISP and TLP series families.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | ISP621-1G |
| 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 ISP621-1G are qualified based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical parameters:
- Single channel configuration (1 channel)
- Isolation voltage of 5300Vrms
- Current transfer ratio range: 50% to 600% @ 5mA
- Transistor output type
- Maximum output voltage of 55V
- Maximum output current of 50mA per channel
- Vce saturation maximum of 400mV
- Operating temperature range of -30°C to 100°C
- 4-DIP through-hole package (0.400", 10.16mm)
- ROHS3 compliance and MSL Level 1 rating
Substitutes are grouped into two series families: ISP621-1 variants and TLP521/TLP621 variants. Within each family, packaging designations (XG, XGR, XGRG, XBLG, XGBG) represent different tape-and-reel or tube configurations and lead finishes, which do not affect electrical performance or functional compatibility.
Parameter Comparison
| Part Number | Series | Channels | Isolation (Vrms) | CTR Min @ 5mA | CTR Max @ 5mA | Output Type | Vout Max (V) | Iout Max (mA) | Vce Sat Max (mV) | Temp Range (°C) | Package | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ISP621-1G | ISP621-1 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 693 |
| ISP521-1XG | ISP521-1 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 789 |
| ISP621-1XG | ISP621-1 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 1250 |
| ISP621-1XGR | ISP621-1 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 769 |
| ISP621-1XGRG | ISP621-1 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 1003 |
| TLP521-1XG | TLP521-1 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 796 |
| TLP521XG | TLP521 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 1085 |
| TLP621XBLG | TLP621 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 1074 |
| TLP621XG | TLP621 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 893 |
| TLP621XGBG | TLP621 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 3102 |
| TLP621XGR | TLP621 | 1 | 5300 | 50% | 600% | Transistor | 55 | 50 | 400 | -30 to 100 | 4-DIP | 842 |
Engineering Selection Recommendations
All listed substitute parts are manufactured by Isocom Components 2004 LTD and maintain active product status. Each part carries ROHS3 compliance certification and MSL Level 1 rating, confirming suitability for standard manufacturing and storage conditions without moisture sensitivity constraints.
Selection among substitute parts should be based on inventory availability and packaging designation requirements. The ISP621-1 series variants (ISP621-1XG, ISP621-1XGR, ISP621-1XGRG) provide direct series compatibility with the primary part number. The TLP521 and TLP621 series variants offer equivalent electrical performance and are interchangeable at the circuit level, with TLP621XGBG offering the highest current inventory level at 3102 units.
Packaging designations (XG, XGR, XGRG, XBLG, XGBG) indicate different tape-and-reel configurations or tube packaging formats and do not affect electrical characteristics or board-level compatibility. Selection should prioritize parts with adequate stock levels and matching packaging requirements for your assembly process.
Frequently Asked Questions (FAQ)
Q: Can I substitute ISP621-1G with any of the listed TLP621 variants?
A: Yes. All TLP621 variants listed (TLP621XG, TLP621XBLG, TLP621XGBG, TLP621XGR) maintain identical electrical specifications and 4-DIP package dimensions as the ISP621-1G. They are functionally interchangeable at the circuit level.
Q: What do the packaging designations (XG, XGR, XGRG, XBLG, XGBG) mean?
A: These designations represent different delivery formats and lead finish specifications. XG, XGR, and XGRG variants differ in tape-and-reel or tube packaging configurations. XBLG and XGBG indicate alternative lead finish or packaging batches. All variants maintain identical electrical performance and pinout compatibility.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed carry ROHS3 compliance certification and MSL Level 1 rating, confirming compliance with current environmental and manufacturing standards.
Q: Can I mix ISP621-1 and TLP621 series parts in the same design?
A: Yes. Both series families meet identical electrical and mechanical specifications for this application. They share the same 4-DIP package footprint, pinout, and performance characteristics. Series selection can be based on inventory availability and supplier preference.
Q: What is the maximum operating temperature for all substitute parts?
A: All substitute parts operate across the temperature range of -30°C to 100°C, matching the primary ISP621-1G specification.
Q: Are there any timing differences between ISP621-1 and TLP521/TLP621 variants?
A: The ISP621-1G does not specify turn-on/turn-off time values. TLP521-1XG and TLP621 variants specify 3µs turn-on and 3µs turn-off times. Rise and fall times are 4µs and 3µs respectively for ISP621-1G, and 2µs and 3µs for TLP621 variants. These minor timing variations do not affect functional compatibility in standard isolation applications.
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