ISP521-2BL Equivalent & Substitute Parts

Part Overview

The ISP521-2BL is a dual-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 8-DIP through-hole component provides galvanic isolation up to 5300Vrms and is designed for applications requiring isolated signal switching and control. The part is currently active in production with 646 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the specified tolerances for this optoisolator category.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISP521-2BL
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Number of Channels	2
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	200% @ 1mA
Current Transfer Ratio (Max)	600% @ 1mA
Output Type	Transistor
Voltage - Output (Max)	55V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-30°C ~ 100°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the ISP521-2BL are qualified based on the following critical parameters that define functional equivalence:

Number of Channels: 2 channels (dual configuration)
Voltage - Isolation: 5300Vrms minimum
Current Transfer Ratio: 200% minimum @ 1mA
Output Type: Transistor output
Voltage - Output (Max): 55V
Current - Output / Channel: 50mA
Vce Saturation (Max): 400mV
Package / Case: 8-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Operating Temperature Range: -30°C ~ 100°C
RoHS Status: ROHS3 Compliant

The identified substitute parts maintain all critical electrical and mechanical parameters within the specified tolerances, ensuring direct functional compatibility in applications designed for the ISP521-2BL.

Parameter Comparison

Parameter	ISP521-2BL	ISP521-2XBL	TLP521-2XBL
Manufacturer	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD
Number of Channels	2	2	2
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms
Current Transfer Ratio (Min)	200% @ 1mA	200% @ 1mA	200% @ 1mA
Current Transfer Ratio (Max)	600% @ 1mA	600% @ 1mA	600% @ 1mA
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	55V	55V	55V
Current - Output / Channel	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	50 mA	50 mA	50 mA
Vce Saturation (Max)	400mV	400mV	400mV
Operating Temperature	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Inventory (Pcs)	646	1107	704

Engineering Selection Recommendations

All three parts—ISP521-2BL, ISP521-2XBL, and TLP521-2XBL—are active products with ROHS3 compliance and REACH unaffected status. Selection between these optoisolators should be based on:

Availability: ISP521-2XBL offers the highest inventory level at 1107 units, followed by TLP521-2XBL at 704 units, and ISP521-2BL at 646 units.

Series Designation: ISP521-2BL and ISP521-2XBL belong to the ISP521-2 series, while TLP521-2XBL belongs to the TLP521-2 series. Both series maintain identical electrical specifications within the parameters provided.

Compliance: All parts meet ROHS3 requirements and are unaffected by REACH regulations, suitable for applications with environmental compliance requirements.

All three parts are functionally equivalent for applications requiring dual-channel optoisolation at 5300Vrms with transistor output in 8-DIP through-hole packaging.

Frequently Asked Questions (FAQ)

Q: Can ISP521-2XBL be used as a direct replacement for ISP521-2BL?

A: Yes. ISP521-2XBL maintains identical electrical and mechanical parameters as ISP521-2BL, including isolation voltage, current transfer ratio, output specifications, and 8-DIP package configuration. Both parts belong to the ISP521-2 series and are functionally equivalent.

Q: What is the difference between ISP521-2BL and TLP521-2XBL?

A: Both parts share identical electrical specifications for isolation voltage (5300Vrms), current transfer ratio (200-600% @ 1mA), output voltage (55V max), output current (50mA per channel), and operating temperature range (-30°C ~ 100°C). The primary difference is series designation: ISP521-2 versus TLP521-2. Both are manufactured by Isocom Components 2004 LTD and use the same 8-DIP through-hole package.

Q: Are all three parts suitable for high-voltage isolation applications?

A: Yes. All three optoisolators provide 5300Vrms isolation voltage, meeting requirements for high-voltage galvanic isolation in industrial control, power management, and signal switching applications.

Q: Do these parts require any special handling or storage considerations?

A: All parts have Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no special moisture control requirements during storage or handling.

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

A: Yes. All three parts use identical 8-DIP (0.300", 7.62mm) through-hole packaging and mounting configuration, allowing direct PCB footprint compatibility without design modifications.

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