TLP521-2BLG Equivalent & Substitute Parts

Part Overview

The TLP521-2BLG 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 electrical isolation between input and output circuits. The part is currently in active production status with 1029 units available in stock. Substitute parts are identified to support component availability, inventory management, and design flexibility while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP521-2BLG
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
Package / Case	8-DIP (0.400", 10.16mm)
Operating Temperature	-30°C ~ 100°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TLP521-2BLG are qualified based on the following critical parameters that determine functional interchangeability:

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
Package / Case: 8-DIP (0.400", 10.16mm)
Mounting Type: Through Hole
Operating Temperature Range: -30°C ~ 100°C
RoHS Compliance: ROHS3 Compliant

All substitute parts meet or exceed these parameters, ensuring direct functional replacement in circuit designs without modification to PCB layout or electrical connections.

Parameter Comparison

Parameter	TLP521-2BLG	ISP521-2XBLG	TLP521-2XBLG
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
Turn On / Turn Off Time (Typ)	3µs, 3µs	Not specified	3µs, 3µs
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs
Input Type	DC	DC	DC
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
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	8-DIP (0.400", 10.16mm)	8-DIP (0.400", 10.16mm)	8-DIP (0.400", 10.16mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Inventory Status	1029 Pcs New Original In Stock	835 Pcs New Original In Stock	1018 Pcs New Original In Stock

Engineering Selection Recommendations

All three parts—TLP521-2BLG, ISP521-2XBLG, and TLP521-2XBLG—are manufactured by Isocom Components 2004 LTD and maintain active product status. Selection between these parts is based on the following criteria:

TLP521-2BLG: Primary choice with complete timing specifications (Turn On / Turn Off Time: 3µs, 3µs). Highest inventory availability at 1029 units.

TLP521-2XBLG: Functionally equivalent to TLP521-2BLG with identical timing specifications. Inventory of 1018 units supports high-volume applications.

ISP521-2XBLG: Meets all electrical and mechanical requirements with the exception that Turn On / Turn Off Time is not specified in available documentation. Inventory of 835 units. This part is suitable for applications where timing specifications are not critical design parameters.

All parts comply with ROHS3 and REACH requirements, supporting regulatory compliance in end-use applications. Moisture Sensitivity Level 1 (Unlimited) indicates no special handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can ISP521-2XBLG be used as a direct replacement for TLP521-2BLG?

A: ISP521-2XBLG meets all specified electrical and mechanical parameters for the TLP521-2BLG. The primary difference is that Turn On / Turn Off Time specifications are not documented for the ISP521-2XBLG. If timing performance is not a critical design requirement, this part provides functional equivalence.

Q: Are all substitute parts pin-compatible with the TLP521-2BLG?

A: Yes. All parts use the 8-DIP (0.400", 10.16mm) package with identical through-hole mounting configuration, ensuring direct PCB compatibility without layout modifications.

Q: Do the substitute parts maintain the same isolation voltage rating?

A: Yes. All parts provide 5300Vrms isolation voltage, meeting the same galvanic isolation requirements as the TLP521-2BLG.

Q: What is the difference between TLP521-2BLG and TLP521-2XBLG?

A: Both parts are from the TLP521-2 series with identical electrical specifications and timing characteristics. The primary distinction is the part number suffix, which may indicate different manufacturing batches or packaging configurations. Both are suitable for direct substitution.

Q: Are there any compliance or regulatory differences between these parts?

A: No. All three parts maintain identical RoHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited) ratings, ensuring equivalent regulatory compliance across all substitute options.

Q: What is the maximum output current per channel?

A: All parts support 50mA maximum output current per channel with a maximum output voltage of 55V, providing identical load-driving capability.

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