TLP521-4SM Equivalent & Substitute Parts

Part Overview

The TLP521-4SM is a quad-channel optoisolator with transistor output manufactured by Isocom Components 2004 LTD. This 16-pin surface mount device provides 5300Vrms isolation across four independent channels, each capable of 50mA output current. The part is classified as Active status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across isolation voltage, channel configuration, output specifications, and package format.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP521-4SM
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
Vce Saturation (Max)	400mV
Rise / Fall Time (Typ)	4µs, 3µs
Operating Temperature	-30°C ~ 100°C
Package / Case	16-SMD, Gull Wing
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the TLP521-4SM are qualified based on strict equivalence across the following critical parameters:

Number of Channels: 4
Voltage - Isolation: 5300Vrms
Current Transfer Ratio range: 50% to 600% @ 5mA
Output Type: Transistor
Voltage - Output (Max): 55V
Current - Output / Channel: 50mA
Vce Saturation (Max): 400mV
Rise / Fall Time: 4µs, 3µs
Package / Case: 16-SMD, Gull Wing
Mounting Type: Surface Mount
Operating Temperature: -30°C ~ 100°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All identified substitute parts maintain identical electrical performance specifications and mechanical compatibility with the main part number.

Parameter Comparison

Parameter	TLP521-4SM	ISP521-4XSM	ISP621-4XGRSM	ISP621-4XSM
Manufacturer	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD
Number of Channels	4	4	4	4
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	55V	55V	55V	55V
Current - Output / Channel	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	16-SMD, Gull Wing	16-SMD, Gull Wing	16-SMD, Gull Wing	16-SMD, Gull Wing
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed maintain full parametric equivalence with the TLP521-4SM across electrical and mechanical specifications. Selection among these parts may be based on inventory availability and supply chain considerations. The ISP521-4XSM represents the closest series variant, while ISP621-4XGRSM and ISP621-4XSM represent alternative series options with identical performance characteristics. All parts carry Active product status and maintain ROHS3 compliance with unlimited moisture sensitivity rating, ensuring compatibility with current manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the TLP521-4SM?

A: Substitute parts must maintain identical specifications across isolation voltage (5300Vrms), channel count (4), output type (Transistor), maximum output voltage (55V), output current per channel (50mA), saturation voltage (400mV), rise/fall times (4µs, 3µs), operating temperature range (-30°C to 100°C), and package format (16-SMD, Gull Wing surface mount).

Q: Are the ISP521-4XSM and ISP621-4XSM parts interchangeable with TLP521-4SM?

A: Yes. Both parts meet all electrical and mechanical equivalence criteria. The ISP521-4XSM belongs to the ISP521-4 series, while ISP621-4XSM and ISP621-4XGRSM belong to the ISP621-4 series. All three substitute parts are parametrically equivalent to the TLP521-4SM.

Q: Does package format affect substitution eligibility?

A: All qualified substitute parts use the identical 16-SMD, Gull Wing surface mount package. Package compatibility is a mandatory substitution criterion and is maintained across all listed alternatives.

Q: What is the significance of the Current Transfer Ratio specification?

A: The Current Transfer Ratio (50% to 600% @ 5mA) defines the optical coupling efficiency between input and output stages. All substitute parts maintain this identical range, ensuring equivalent signal transfer characteristics and circuit performance.

Q: Are there compliance differences between the main part and substitutes?

A: No. All parts carry identical RoHS3 compliance status, REACH Unaffected designation, and Moisture Sensitivity Level 1 (Unlimited) rating. Compliance profiles are equivalent across all listed parts.

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