PS8101-V-F3-AX Optoisolator Equivalent & Substitute Parts

Part Overview

The PS8101-V-F3-AX is a transistor-output optoisolator with 3750Vrms isolation capability, packaged in a 5-SOP (6-SOIC footprint) configuration. This component is classified as discontinued at DiGi Electronics while maintaining adequate inventory support. The identification of substitute optoisolators is driven by the need to ensure design continuity and manufacturing availability with functionally compatible alternatives that meet the electrical and mechanical requirements of the original design.

Key Parameters

Parameter	Specification
Isolation Voltage	3750Vrms
Output Type	Transistor
Number of Channels	1
Current Transfer Ratio (Min)	15% @ 16mA
Current Transfer Ratio (Max)	35% @ 16mA
Maximum Output Voltage	35V
Output Current per Channel	8mA
Input Forward Voltage (Typ)	1.7V
Maximum DC Forward Current	25mA
Operating Temperature Range	-55°C to 100°C
Package Type	6-SOIC (0.173", 4.40mm Width), 5 Leads
Mounting Type	Surface Mount
Input Type	DC
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Optoisolator substitution is determined by strict parameter compatibility across isolation voltage, output characteristics, package footprint, and thermal operating range. The PS8101-V-F3-AX operates at 3750Vrms isolation with a transistor output delivering 8mA per channel at maximum 35V, with DC input characteristics (1.7V forward voltage typical, 25mA maximum forward current).

Substitute parts are categorized as follows:

Parametric Equivalent (Exact Match): PS8101-F3-AX matches all critical electrical parameters of the original part with identical isolation voltage (3750Vrms), current transfer ratio range (15-35% @ 16mA), maximum output voltage (35V), and thermal range (-55°C to 100°C). The sole distinction is product status (active versus discontinued) and packaging availability.

Similar Parts (Extended Compatibility): The Broadcom R²Coupler™ series (ACPL-M43, ACPL-M49, ACPL-M50L) and onsemi FODM452 provide functional substitution with allowable parameter variations. These alternatives maintain the 3750Vrms isolation requirement, transistor output configuration, 8mA output current, and 6-SOIC package footprint, but exhibit differences in isolation voltage level, current transfer ratio performance characteristics, and thermal operating ranges that must be evaluated against specific application requirements.

Parameter Comparison

Parameter	PS8101-V-F3-AX	PS8101-F3-AX	ACPL-M43T-000E	ACPL-M43T-500E	ACPL-M43U-000E	ACPL-M49T-000E	ACPL-M49T-500E	ACPL-M50L-000E	ACPL-M50L-500E	ACPL-M50L-560E	FODM452
Isolation Voltage	3750Vrms	3750Vrms	4000Vrms	4000Vrms	3750Vrms	4000Vrms	4000Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	15% @ 16mA	15% @ 16mA	32% @ 10mA	32% @ 10mA	32% @ 10mA	32% @ 10mA	32% @ 10mA	100% @ 3mA	100% @ 3mA	100% @ 3mA	20% @ 16mA
Current Transfer Ratio (Max)	35% @ 16mA	35% @ 16mA	100% @ 10mA	100% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA	200% @ 3mA	200% @ 3mA	200% @ 3mA	50% @ 16mA
Turn On / Turn Off Time (Typ)	500ns, 600ns	500ns, 600ns	150ns, 500ns	150ns, 500ns	200ns, 300ns	—	—	200ns, 380ns	200ns, 380ns	200ns, 380ns	400ns, 350ns
Voltage - Output (Max)	35V	35V	20V	20V	20V	20V	20V	24V	24V	24V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.7V	1.7V	1.55V	1.55V	1.5V	1.5V	1.5V	1.5V	1.5V	1.5V	1.6V
Current - DC Forward (If) (Max)	25mA	25mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA	25mA
Operating Temperature Range	-55°C to 100°C	-55°C to 100°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 105°C	-40°C to 105°C	-40°C to 105°C	-40°C to 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)	6-SOIC (0.173", 4.40mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)

Engineering Selection Recommendations

PS8101-F3-AX (Parametric Equivalent): This part provides direct substitution with identical electrical and thermal specifications. It is currently in active production status with established supply channels, making it the preferred replacement for PS8101-V-F3-AX applications requiring no design modification.

ACPL-M43T-000E and ACPL-M43T-500E: These Broadcom R²Coupler™ variants offer 4000Vrms isolation (exceeding the original 3750Vrms requirement) with extended operating temperature range (-40°C to 125°C versus -55°C to 100°C). Current transfer ratio performance (32-100% @ 10mA) differs from the original specification, resulting in reduced maximum output voltage (20V versus 35V). These parts are suitable for applications where higher isolation voltage and extended temperature operation are beneficial, provided output voltage limitations are acceptable.

ACPL-M43U-000E: This variant maintains 3750Vrms isolation matching the original specification, with improved current transfer ratio characteristics (32-80% @ 10mA) and faster switching performance (200ns/300ns versus 500ns/600ns). Extended operating temperature (-40°C to 125°C) is provided. Maximum output voltage is reduced to 20V.

ACPL-M49T-000E and ACPL-M49T-500E: These parts provide 4000Vrms isolation with current transfer ratio performance of 32-80% @ 10mA. Operating temperature range extends to 125°C. Maximum output voltage is limited to 20V. Switching time parameters are not specified in the supplied data.

ACPL-M50L-000E, ACPL-M50L-500E, and ACPL-M50L-560E: These variants offer 3750Vrms isolation matching the original part, with superior current transfer ratio characteristics (100-200% @ 3mA) enabling lower input current drive requirements. Maximum output voltage is 24V with operating temperature to 105°C. These parts support high-performance applications requiring lower input power dissipation.

FODM452 (onsemi): This part maintains 3750Vrms isolation with current transfer ratio of 20-50% @ 16mA (within close tolerance of the original 15-35% @ 16mA specification). It supports 25mA maximum forward current matching the original design. Operating temperature range is limited to -40°C to 85°C. Package is 5-Mini-Flat configuration in the 6-SOIC footprint family. This option provides the closest performance match to the original part with modest temperature range trade-off.

All substitute parts are ROHS3 compliant and rated at MSL 1 (unlimited moisture sensitivity), meeting environmental and regulatory requirements equivalent to the original component.

Frequently Asked Questions (FAQ)

Q: What is the primary difference between PS8101-V-F3-AX and PS8101-F3-AX? A: Both parts are electrically and thermally identical with matching isolation voltage (3750Vrms), current transfer ratio range (15-35% @ 16mA), output voltage (35V maximum), and operating temperature (-55°C to 100°C). The distinction is product lifecycle status—PS8101-V-F3-AX is discontinued, while PS8101-F3-AX is in active production. PS8101-F3-AX is the direct substitute.

Q: Can I use parts with higher isolation voltage (4000Vrms) as substitutes? A: Broadcom ACPL-M43 and ACPL-M49 series parts with 4000Vrms isolation are mechanically compatible and electrically functional substitutes. Higher isolation voltage does not degrade circuit performance but increases component cost and may be unnecessary if the original 3750Vrms specification is sufficient for the application.

Q: What is the impact of different current transfer ratio specifications? A: Current transfer ratio determines the efficiency of optical coupling and affects input drive current and output current delivery. The PS8101-V-F3-AX requires 15-35% @ 16mA input current for reliable operation. ACPL-M50L series parts deliver 100-200% @ 3mA, requiring significantly lower input drive current while providing equivalent output performance. ACPL-M43 and ACPL-M49 variants provide 32-80% or 32-100% @ 10mA, requiring intermediate drive levels. Application circuit design must accommodate these differences.

Q: Are all substitute parts compatible with the original package footprint? A: All listed substitutes use the 6-SOIC (0.173", 4.40mm Width) package with 5-lead configuration, providing identical footprint compatibility for direct PCB replacement. Package suppliers may differ (tube, tape and reel, bulk packaging), affecting procurement and assembly logistics but not electrical performance.

Q: What temperature range considerations apply to substitute selection? A: The original PS8101-V-F3-AX operates from -55°C to 100°C. Broadcom parts extend the upper temperature limit to 125°C, supporting high-temperature applications. ACPL-M50L and FODM452 options have reduced upper limits (105°C and 85°C respectively). Design requirements must confirm acceptable operating temperature boundaries.

Q: Does the reduced maximum output voltage in substitute parts affect circuit operation? A: The PS8101-V-F3-AX provides 35V maximum output voltage. Most substitute parts limit this to 20-24V. If the circuit design depends on loading conditions requiring the full 35V capability, output voltage reduction may impact circuit functionality. Circuit analysis of collector load resistances and supply voltages is required.

Q: Are all substitutes ROHS3 compliant? A: All listed substitutes and the original PS8101-V-F3-AX are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity) ratings, meeting environmental and regulatory standards. ACPL-M43T variants carry AEC-Q100 automotive qualification.

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