PS8502L2-AX Optoisolator - Equivalent & Substitute Parts

Part Overview

The PS8502L2-AX is a single-channel optoisolator with transistor output, rated for 5000Vrms isolation voltage. This component belongs to the NEPOC series manufactured by CEL. The PS8502L2-AX is currently discontinued at DiGi Electronics, necessitating the identification of equivalent and substitute parts for continued system integration and maintenance applications. Substitute components must maintain electrical compatibility across isolation voltage, output characteristics, and thermal operating range.

Key Parameters

Parameter	Value
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	15% @ 16mA
Output Voltage (Max)	35V
Output Current / Channel	8mA
Input Voltage - Forward (Typ)	1.7V
Input Current - DC Forward (Max)	25mA
Operating Temperature Range	-55°C ~ 100°C
Package / Case	8-SMD, Gull Wing
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Compatibility Criteria:

Isolation voltage of 5000Vrms minimum
Single-channel transistor output configuration
Output voltage capability of 20V or greater
Output current capacity of 8mA or greater
Current transfer ratio minimum of 15% @ 16mA
Input characteristics compatible with 25mA DC forward current

Packaging Consideration:

Original part uses 8-SMD Gull Wing surface mount package
Substitutes with 8-DIP Gull Wing configuration are electrically compatible but require PCB layout re-evaluation

Product Status Impact:

Original PS8502L2-AX is discontinued; substitutes with active product status are preferred for new designs
Substitutes with RoHS3 compliance and active status provide superior availability and regulatory alignment

Substitute parts are categorized into two groups:

Group A - Broadcom Limited HCNW4502 and HCNW4503 Series: Identical electrical ratings (5000Vrms isolation, 15% min CTR @ 16mA, 20V max output) with active product status. These parts support equivalent circuit functionality with different packaging options.

Group B - Broadcom Limited HCNW4504 Series: Enhanced current transfer ratio (19-63% @ 16mA), faster switching times (200ns / 300ns vs. 220ns / 350ns), and active status. These provide superior performance characteristics within the same 5000Vrms isolation specification.

Group C - Broadcom Limited HCPL-4504 Series: HCPL-4504-320E maintains 5000Vrms isolation with superior CTR (25-60%), matching operating temperature range, and RoHS3 compliance. HCPL-4504#300 operates at reduced isolation voltage (3750Vrms) and is not recommended as a direct substitute for 5000Vrms applications.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 16mA	Output Voltage (Max)	Turn On / Turn Off Time	Operating Temp	Package	Product Status	RoHS Status
PS8502L2-AX	CEL	5000Vrms	15%	35V	220ns, 350ns	-55°C ~ 100°C	8-SMD GW	Discontinued	RoHS3
HCNW4502-500E	Broadcom	5000Vrms	15%	20V	1µs, 1µs	-55°C ~ 85°C	8-DIP GW	Active	RoHS3
HCNW4503#300	Broadcom	5000Vrms	15%	20V	1µs, 1µs	-55°C ~ 85°C	8-DIP GW	Active	RoHS Non-compliant
HCNW4503-500E	Broadcom	5000Vrms	15%	20V	1µs, 1µs	-55°C ~ 85°C	8-DIP GW	Active	RoHS3
HCNW4504-300E	Broadcom	5000Vrms	19%	20V	200ns, 300ns	-55°C ~ 85°C	8-DIP GW	Active	RoHS3
HCNW4504-500E	Broadcom	5000Vrms	19%	20V	200ns, 300ns	-55°C ~ 85°C	8-SMD	Active	RoHS3
HCPL-4504#300	Broadcom	3750Vrms	25%	20V	200ns, 300ns	-55°C ~ 100°C	8-SMD GW	Active	RoHS Non-compliant
HCPL-4504-320E	Broadcom	5000Vrms	25%	20V	200ns, 300ns	-55°C ~ 100°C	8-SMD GW	Active	RoHS3
PS8502L2-AX (Renesas)	Renesas Electronics	5000Vrms	15%	35V	220ns, 350ns	-55°C ~ 100°C	8-SMD GW	Active	RoHS3

Engineering Selection Recommendations

Primary Substitute - Preferred for Direct Replacement: PS8502L2-AX manufactured by Renesas Electronics Corporation is a parametric equivalent with identical electrical characteristics, package configuration, and operating temperature range. This component maintains the 35V maximum output voltage capability of the original CEL part while offering active product status and full RoHS3 compliance. Selection of this part eliminates PCB re-layout requirements.

Secondary Substitutes - Broadcom HCNW4504-500E: This part provides electrical equivalence through 5000Vrms isolation, identical output current capacity, and RoHS3 compliance. The 8-SMD package matches the original configuration, eliminating layout concerns. Superior current transfer ratio (19% minimum) and faster switching times (200ns / 300ns) provide improved performance characteristics. Reduced maximum output voltage (20V vs. 35V) requires circuit validation but is acceptable for most applications operating below 20V output levels.

Tertiary Substitutes - Broadcom HCNW4503-500E and HCNW4504-300E: These components satisfy the 5000Vrms isolation and 8mA output current requirements with active product status. The 8-DIP Gull Wing package necessitates PCB re-layout. HCNW4504-300E offers enhanced current transfer ratio and faster switching. Both require component re-qualification for footprint compatibility.

Alternative - HCPL-4504-320E: This part meets full electrical requirements including 5000Vrms isolation, enhanced current transfer ratio (25-60%), and operates across the identical -55°C to 100°C temperature range. The 8-SMD Gull Wing package eliminates layout changes. RoHS3 compliance and active product status support long-term procurement stability.

Not Recommended: HCPL-4504#300 operates at 3750Vrms isolation voltage and does not satisfy the 5000Vrms isolation requirement of the original design. HCNW4503#300 carries RoHS non-compliant status, limiting applicability in regulated environments.

Frequently Asked Questions (FAQ)

Q: Can I use HCNW4504-500E as a direct replacement without PCB modifications? A: Yes. The HCNW4504-500E uses the same 8-SMD Gull Wing package as the original PS8502L2-AX, eliminating PCB re-layout requirements. The 20V maximum output voltage is compatible with circuits designed for the original 35V rating, provided the actual operating voltage does not exceed 20V.

Q: What is the difference between HCNW4503-500E and HCNW4504-500E? A: Both parts maintain identical 5000Vrms isolation and 15% minimum current transfer ratio. The HCNW4504 series exhibits superior switching characteristics (200ns / 300ns vs. 1µs) and higher current transfer ratio range (19-63% vs. 15%), providing faster transient response suitable for higher-frequency switching applications.

Q: Is the Renesas PS8502L2-AX equivalent truly identical to the original CEL part? A: Yes. The Renesas PS8502L2-AX shares identical part numbering, electrical specifications, and package configuration with the original CEL part. Both operate across -55°C to 100°C with 35V maximum output voltage and 5000Vrms isolation. This component provides the optimal direct replacement path.

Q: Why do some substitutes list different operating temperature ranges? A: The original CEL PS8502L2-AX operates from -55°C to 100°C. Broadcom HCNW series components specify -55°C to 85°C operation, a narrower range. Selection depends on end-application thermal requirements. For applications requiring operation above 85°C, Renesas PS8502L2-AX or Broadcom HCPL-4504-320E are required.

Q: Can I substitute a part with 3750Vrms isolation for a 5000Vrms application? A: No. The HCPL-4504#300 operates at 3750Vrms isolation and does not satisfy design specifications requiring 5000Vrms isolation voltage. Isolation voltage is a non-negotiable parameter determined by circuit safety and regulatory compliance requirements.

Q: What packaging options are available among the substitutes? A: Three packaging configurations exist: 8-SMD Gull Wing (PS8502L2-AX Renesas, HCNW4504-500E, HCPL-4504 series), 8-DIP Gull Wing (HCNW4502-500E, HCNW4503 series), and Tube / Reel variations. The 8-SMD Gull Wing matches the original CEL package without re-layout. 8-DIP Gull Wing substitutes require PCB footprint re-design.

Q: What does "Current Transfer Ratio" mean in the context of optoisolator selection? A: Current Transfer Ratio (CTR) expresses the relationship between input LED current and output transistor collector current, specified as a percentage. A 15% CTR @ 16mA input produces 2.4mA output current. Higher CTR values reduce input drive current requirements for equivalent output performance. The minimum specified CTR ensures worst-case performance across manufacturing tolerances and operating conditions.

Q: Are all recommended substitutes RoHS3 compliant? A: No. HCNW4503#300 and HCPL-4504#300 are marked as RoHS non-compliant. All other listed substitutes carry RoHS3 compliance, supporting use in regulated applications with lead-free manufacturing requirements.

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