ISP817 Optoisolator Transistor Output Equivalent & Substitute Parts

Part Overview

The ISP817 is a single-channel optoisolator with transistor output, manufactured by Isocom Components 2004 LTD. This component provides galvanic isolation up to 5300Vrms and is designed for applications requiring DC input control with transistor-based switching output. The ISP817 maintains active product status with 1335 units in current inventory. Substitute parts are identified based on identical electrical specifications, mechanical compatibility, and packaging standards to ensure direct functional replacement in existing circuit designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISP817
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
Rise / Fall Time (Typ)	3µs, 4µs
Input Type	DC
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Vce Saturation (Max)	200mV
Operating Temperature	-55°C ~ 110°C
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the ISP817 are qualified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution criteria include:

Electrical Parameters (Must Match):

Voltage - Isolation: 5300Vrms
Current Transfer Ratio range: 50% to 600% @ 5mA
Output voltage capability: 80V maximum
Output current per channel: 50mA
Vce Saturation: 200mV maximum
Input type: DC
Output type: Transistor

Mechanical & Environmental Parameters (Must Match):

Package / Case: 4-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Operating Temperature: -55°C ~ 110°C
Number of Channels: 1

Compliance & Status (Must Match):

Product Status: Active
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

The following parts meet all substitution criteria: ISP817XA, ISP817XB, and ISP817XD.

Parameter Comparison

Parameter	ISP817	ISP817XA	ISP817XB	ISP817XD
Manufacturer	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD	Isocom Components 2004 LTD
Number of Channels	1	1	1	1
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
Rise / Fall Time (Typ)	3µs, 4µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Input Type	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA
Vce Saturation (Max)	200mV	200mV	200mV	200mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°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)
Current Inventory	1335 Pcs	1280 Pcs	1225 Pcs	22400 Pcs

Engineering Selection Recommendations

All three substitute parts—ISP817XA, ISP817XB, and ISP817XD—are direct parametric equivalents to the ISP817 and are suitable for component replacement in applications requiring single-channel optoisolation with transistor output at 5300Vrms isolation voltage.

Selection Basis:

All substitute parts maintain identical electrical performance specifications including isolation voltage, current transfer ratio range, output voltage and current ratings, and saturation characteristics. Mechanical compatibility is assured through identical 4-DIP through-hole packaging. Environmental operating temperature range and compliance certifications (ROHS3, MSL Level 1) are uniform across all parts.

Inventory Availability:

ISP817XD offers the highest inventory availability at 22400 units, followed by ISP817XA at 1280 units and ISP817XB at 1225 units. The original ISP817 maintains 1335 units in stock. All parts carry active product status.

Frequently Asked Questions (FAQ)

Q: Can ISP817XA, ISP817XB, and ISP817XD be used interchangeably with ISP817?

A: Yes. All three substitute parts meet identical electrical specifications for isolation voltage (5300Vrms), current transfer ratio (50% to 600% @ 5mA), output voltage (80V max), output current (50mA), and saturation voltage (200mV max). Mechanical compatibility is confirmed through identical 4-DIP through-hole packaging and operating temperature range (-55°C ~ 110°C).

Q: Are there any timing differences between ISP817 and its substitutes?

A: Rise and fall times are specified as 3µs and 4µs for ISP817, while ISP817XA, ISP817XB, and ISP817XD specify 4µs and 3µs respectively. Both configurations fall within the same timing envelope and do not affect functional compatibility in standard applications.

Q: Do all substitute parts have the same compliance certifications?

A: Yes. ISP817, ISP817XA, ISP817XB, and ISP817XD are all ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts are manufactured by Isocom Components 2004 LTD and maintain active product status.

Q: What is the package compatibility for these parts?

A: All parts use 4-DIP (0.300", 7.62mm) through-hole packaging. Pin configuration and footprint are identical, ensuring direct PCB compatibility without layout modifications.

Q: Which substitute part should be selected based on availability?

A: ISP817XD provides the highest inventory level at 22400 units. ISP817XA and ISP817XB offer intermediate availability at 1280 and 1225 units respectively. Selection should be based on supply chain requirements and lead time considerations.

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