ISP521-1BL Equivalent & Substitute Parts

Part Overview

The ISP521-1BL is an optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This single-channel device provides 5300Vrms isolation in a 4-DIP package and is designed for DC input applications requiring galvanic isolation with transistor-based switching output. The part is currently active in production with full RoHS3 compliance. Substitute parts are identified based on matching electrical specifications, isolation voltage, output characteristics, and package compatibility to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISP521-1BL
Manufacturer	Isocom Components 2004 LTD
Category	Optoisolators
Number of Channels	1
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	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the ISP521-1BL 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: 200% to 600% @ 1mA (all substitutes match)
Maximum Output Voltage: 55V (all substitutes match)
Maximum Output Current: 50mA per channel (all substitutes match)
Package Type: 4-DIP (0.300", 7.62mm) (all substitutes match)
Mounting Type: Through Hole (all substitutes match)
Operating Temperature Range: -30°C ~ 100°C (all substitutes match)
Vce Saturation: 400mV maximum (all substitutes match)

All identified substitutes maintain identical electrical performance specifications and physical package compatibility, enabling direct replacement in existing circuit designs without modification.

Parameter Comparison

Parameter	ISP521-1BL	ISP521-1XBL	TLP521-1XBL	TLP521XBL
Manufacturer	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD
Series	ISP521-1	ISP521-1	TLP521-1	TLP521
Number of Channels	1	1	1	1
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Current Transfer Ratio (Min)	200% @ 1mA	200% @ 1mA	200% @ 1mA	200% @ 1mA
Current Transfer Ratio (Max)	600% @ 1mA	600% @ 1mA	600% @ 1mA	600% @ 1mA
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
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All substitute parts listed—ISP521-1XBL, TLP521-1XBL, and TLP521XBL—are active production components with full RoHS3 compliance and REACH unaffected status. Selection among these equivalents may be based on inventory availability and lead time considerations. The ISP521-1BL and ISP521-1XBL share identical series designation and specifications. The TLP521-1XBL and TLP521XBL variants represent alternative series designations from the same manufacturer but maintain complete electrical and mechanical compatibility with the primary part.

Frequently Asked Questions (FAQ)

Q: Can ISP521-1XBL be used as a direct replacement for ISP521-1BL?

A: Yes. Both parts share identical electrical specifications, isolation voltage, output characteristics, and 4-DIP package configuration. No circuit modifications are required.

Q: What is the difference between TLP521-1XBL and TLP521XBL?

A: Both parts maintain identical electrical performance and package specifications. The difference is in series designation (TLP521-1 versus TLP521). Both are functionally equivalent to ISP521-1BL.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitutes—ISP521-1XBL, TLP521-1XBL, and TLP521XBL—are ROHS3 compliant and REACH unaffected.

Q: Can these parts be used in applications requiring 5300Vrms isolation?

A: Yes. All substitute parts maintain the 5300Vrms isolation voltage specification of the ISP521-1BL.

Q: Are there any differences in turn-on/turn-off timing between the main part and substitutes?

A: The ISP521-1BL does not specify turn-on/turn-off time. The TLP521-1XBL and TLP521XBL specify 3µs turn-on and 3µs turn-off time. Rise and fall times are identical across all parts at 4µs and 3µs respectively.

Q: What is the maximum operating temperature range for these parts?

A: All parts operate across -30°C to 100°C.

Q: Are these parts suitable for through-hole PCB assembly?

A: Yes. All parts feature through-hole mounting in 4-DIP (0.300", 7.62mm) packages.

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