PS8101-AX Optoisolator Equivalent & Substitute Parts

Part Overview

The PS8101-AX is a single-channel optoisolator with transistor output manufactured by CEL, rated for 3750Vrms isolation voltage. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement. The PS8101-AX operates with DC input, transistor output configuration, and is housed in a 6-SOIC (5-lead) surface mount package suitable for high-voltage isolation applications.

Key Parameters

Parameter	PS8101-AX Value
Manufacturer	CEL
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	3750Vrms
Current Transfer Ratio (Min)	15% @ 16mA
Current Transfer Ratio (Max)	35% @ 16mA
Turn On / Turn Off Time (Typ)	500ns, 600ns
Input Type	DC
Output Type	Transistor
Voltage - Output (Max)	35V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.7V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SOIC (0.173", 4.40mm Width), 5 Leads
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute optoisolators for the PS8101-AX are selected based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Single-channel configuration (Number of Channels = 1)
Isolation voltage rating of 3750Vrms or higher
Transistor output topology
DC input type
Surface mount package with 5-lead configuration (6-SOIC or 5-SO)
Output current capability of 8mA per channel
RoHS3 compliance and MSL 1 rating

Secondary Compatibility Factors:

Current transfer ratio performance at specified test currents
Turn-on and turn-off switching times
Maximum output voltage rating
Forward voltage characteristics
Operating temperature range overlap

Substitute parts are grouped into two categories: Broadcom Limited R²Coupler™ series optoisolators (ACPL-M43, ACPL-M49, ACPL-M50 families) and onsemi FODM452 series. All substitute parts maintain the same package footprint and lead configuration, enabling direct PCB layout compatibility.

Parameter Comparison

Parameter	PS8101-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	FODM452R2
Manufacturer	CEL	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	onsemi	onsemi
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Voltage - Isolation	3750Vrms	4000Vrms	4000Vrms	3750Vrms	4000Vrms	4000Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Current Transfer Ratio (Min)	15% @ 16mA	32% @ 10mA	32% @ 10mA	32% @ 10mA	32% @ 10mA	32% @ 10mA	100% @ 3mA	100% @ 3mA	100% @ 3mA	20% @ 16mA	20% @ 16mA
Current Transfer Ratio (Max)	35% @ 16mA	100% @ 10mA	100% @ 10mA	80% @ 10mA	80% @ 10mA	80% @ 10mA	200% @ 3mA	200% @ 3mA	200% @ 3mA	50% @ 16mA	50% @ 16mA
Turn On / Turn Off Time (Typ)	500ns, 600ns	150ns, 500ns	150ns, 500ns	200ns, 300ns	—	—	200ns, 380ns	200ns, 380ns	200ns, 380ns	400ns, 350ns	400ns, 350ns
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	35V	20V	20V	20V	20V	20V	24V	24V	24V	20V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.7V	1.55V	1.55V	1.5V	1.5V	1.5V	1.5V	1.5V	1.5V	1.6V	1.6V
Current - DC Forward (If) (Max)	25mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA	25mA	25mA
Operating Temperature	-55°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 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, 5 Leads	6-SOIC, 5 Leads	6-SOIC, 5 Leads	6-SOIC, 5 Leads	6-SOIC, 5 Leads	6-SOIC, 5 Leads	6-SOIC, 5 Leads	6-SOIC, 5 Leads	6-SOIC, 5 Leads	6-SOIC, 5 Leads	6-SOIC, 5 Leads
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)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Broadcom ACPL-M50L Series (ACPL-M50L-000E, ACPL-M50L-500E, ACPL-M50L-560E)

The ACPL-M50L series represents the closest functional equivalent to the PS8101-AX. These parts maintain identical isolation voltage (3750Vrms), matching output voltage capability (24V exceeds the PS8101-AX 35V requirement for most applications), and equivalent output current (8mA). The ACPL-M50L series demonstrates superior current transfer ratio performance (100% minimum at 3mA versus 15% at 16mA for the PS8101-AX), enabling more efficient LED drive circuits. All variants are active products with ROHS3 compliance and MSL 1 rating. The ACPL-M50L-500E and ACPL-M50L-560E variants offer extended availability in cut tape and Digi-Reel packaging formats.

Broadcom ACPL-M43U-000E

The ACPL-M43U-000E provides equivalent isolation voltage (3750Vrms) with improved switching performance (200ns turn-on, 300ns turn-off versus 500ns, 600ns for PS8101-AX). This part is suitable for applications requiring faster response times. Operating temperature range extends to 125°C, providing broader thermal margin. Current transfer ratio performance (32% minimum at 10mA) exceeds the PS8101-AX specification.

Broadcom ACPL-M43T and ACPL-M49T Series

The ACPL-M43T and ACPL-M49T series offer enhanced isolation voltage (4000Vrms) for applications requiring additional isolation margin. The ACPL-M43T series provides the fastest switching performance (150ns turn-on, 500ns turn-off) among all substitutes. These parts are qualified to AEC-Q100 automotive standards, providing additional reliability assurance. Operating temperature range extends to 125°C.

onsemi FODM452 and FODM452R2

The FODM452 series maintains identical isolation voltage (3750Vrms) and current transfer ratio characteristics closely matching the PS8101-AX (20% minimum at 16mA versus 15% minimum). These parts are active products with ROHS3 compliance. The FODM452R2 variant offers extended availability in cut tape and Digi-Reel packaging. Operating temperature range is limited to -40°C to 85°C, which may restrict use in high-temperature applications.

Selection Priority:

For direct replacement with enhanced performance and extended availability, select ACPL-M50L-500E or ACPL-M50L-560E. For applications requiring faster switching response, select ACPL-M43U-000E. For applications requiring maximum isolation voltage margin and automotive qualification, select ACPL-M43T-500E or ACPL-M49T-500E. For cost-optimized replacement with similar electrical characteristics, select FODM452R2.

Frequently Asked Questions (FAQ)

Q: Can the ACPL-M50L series directly replace the PS8101-AX without PCB modifications?

A: Yes. The ACPL-M50L series shares identical package footprint (6-SOIC, 5-lead configuration) and pinout compatibility with the PS8101-AX. No PCB layout changes are required. However, circuit design parameters such as input current limiting resistor values may require adjustment due to superior current transfer ratio performance of the ACPL-M50L series.

Q: What is the primary difference between ACPL-M50L-000E, ACPL-M50L-500E, and ACPL-M50L-560E?

A: These three part numbers are electrically identical. The differences are packaging format and supplier designation. ACPL-M50L-000E is supplied in tube packaging. ACPL-M50L-500E and ACPL-M50L-560E are supplied in cut tape and Digi-Reel formats, offering higher volume availability and automated assembly compatibility.

Q: Why do some substitute parts show higher maximum output voltage (24V or 20V) compared to the PS8101-AX (35V)?

A: The PS8101-AX maximum output voltage specification of 35V is a device rating that does not affect substitution suitability. Substitute parts with 20V or 24V maximum output voltage ratings are suitable for applications where the actual output voltage does not exceed these limits. Circuit design must ensure output voltage remains within the substitute part's rated specification.

Q: Is the ACPL-M43T series suitable for applications requiring the PS8101-AX operating temperature range of -55°C to 100°C?

A: The ACPL-M43T series operates from -40°C to 125°C, which covers the upper portion of the PS8101-AX temperature range (-55°C to 100°C). For applications requiring operation below -40°C, the ACPL-M43T series is not suitable. The FODM452 series operates from -40°C to 85°C and is also unsuitable for sub -40°C operation.

Q: What is the significance of AEC-Q100 qualification on the ACPL-M43T and ACPL-M49T series?

A: AEC-Q100 qualification indicates the parts meet automotive industry reliability and quality standards. This qualification is relevant only for applications requiring automotive-grade components. For non-automotive applications, AEC-Q100 qualification provides no functional advantage.

Q: How does the current transfer ratio difference between PS8101-AX and substitute parts affect circuit design?

A: Current transfer ratio determines the relationship between input LED current and output transistor current. The PS8101-AX specifies 15-35% at 16mA input current. Substitute parts such as ACPL-M50L (100-200% at 3mA) require significantly lower input current to achieve equivalent output current. Circuit input current limiting resistor values must be recalculated based on the substitute part's current transfer ratio specification to maintain proper circuit operation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (ACPL-M43, ACPL-M49, ACPL-M50 series from Broadcom and FODM452 series from onsemi) are ROHS3 compliant. All parts also maintain MSL 1 (unlimited moisture sensitivity level) rating, matching the PS8101-AX specification.

Q: Which substitute part offers the best availability?

A: The ACPL-M50L-500E and ACPL-M49T-500E variants demonstrate the highest inventory levels (30,300 and 33,200 units respectively) in cut tape and Digi-Reel packaging formats, indicating superior long-term availability and supply chain support.

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