HCPL2531 Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL2531 is a 2-channel optoisolator with transistor output manufactured by onsemi, rated for 2500Vrms isolation voltage. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. The HCPL2531 operates with DC input, provides transistor output configuration, and is packaged in 8-DIP through-hole format suitable for standard PCB assembly.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL2531
Manufacturer	onsemi
Number of Channels	2
Voltage - Isolation	2500Vrms
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Turn On / Turn Off Time (Typ)	450ns, 300ns
Output Type	Transistor
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.45V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the HCPL2531 is determined by the following critical parameters: number of channels (2), package type (8-DIP through-hole), output configuration (transistor), input type (DC), and electrical compatibility within isolation voltage, current transfer ratio, and output voltage ratings.

Substitute parts are grouped into two categories:

Category 1: Direct Manufacturer Upgrade (onsemi) The HCPL2531M represents the manufacturer's active-status equivalent, offering enhanced isolation voltage (5000Vrms vs. 2500Vrms) while maintaining identical channel count, package, and output specifications. This part is suitable for applications requiring higher isolation margins.

Category 2: Cross-Manufacturer Alternatives (Broadcom Limited, Isocom Components) Parts including HCPL-2531, HCPL-2531-000E, HCPL-2531-020E, HCPL-2533, HCPL-2533-000E, HCPL-253L-000E, HCPL-4534-000E, and ICPL2531 provide functional equivalence through matching channel count, package format, and transistor output configuration. These parts vary in isolation voltage (3750Vrms to 5000Vrms), current transfer ratio specifications, output voltage ratings, and compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	Channels	CTR Min @ 16mA	CTR Max @ 16mA	Turn On/Off Time (ns)	Output Voltage Max	Package	Status	RoHS
HCPL2531	onsemi	2500Vrms	2	19%	50%	450, 300	20V	8-DIP	Obsolete	ROHS3
HCPL2531M	onsemi	5000Vrms	2	19%	50%	250, 260	20V	8-DIP	Active	ROHS3
HCPL-2531	Broadcom Limited	3750Vrms	2	19%	50%	200, 600	20V	8-DIP	Active	Non-compliant
HCPL-2531-000E	Broadcom Limited	3750Vrms	2	19%	50%	200, 600	20V	8-DIP	Active	ROHS3
HCPL-2531-020E	Broadcom Limited	5000Vrms	2	19%	50%	200, 600	20V	8-DIP	Active	ROHS3
HCPL-2533	Broadcom Limited	3750Vrms	2	15%	—	800, 1000	7V	8-DIP	Active	Non-compliant
HCPL-2533-000E	Broadcom Limited	3750Vrms	2	15%	—	800, 1000	7V	8-DIP	Active	ROHS3
HCPL-253L-000E	Broadcom Limited	3750Vrms	2	19%	50%	200, 600	7V	8-DIP	Active	ROHS3
HCPL-4534-000E	Broadcom Limited	3750Vrms	2	15%	50%	200, 600	20V	8-DIP	Active	ROHS3
ICPL2531	Isocom Components 2004 LTD	5000Vrms	2	19%	50%	350, 300	20V	8-DIP	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: HCPL2531M (onsemi) This part is the manufacturer's direct upgrade path from the obsolete HCPL2531. It maintains identical electrical specifications for current transfer ratio and output characteristics while providing enhanced isolation voltage (5000Vrms). Active product status ensures long-term availability and supply chain stability. ROHS3 compliance aligns with modern manufacturing standards.

Secondary Recommendation: HCPL-2531-000E (Broadcom Limited) This part provides functional equivalence with ROHS3 compliance and active status. The 3750Vrms isolation voltage exceeds the original 2500Vrms specification, providing adequate margin for most applications. Identical current transfer ratio range (19%–50% @ 16mA) and 20V maximum output voltage ensure direct functional compatibility.

Alternative for Enhanced Isolation: HCPL-2531-020E (Broadcom Limited) This variant offers 5000Vrms isolation voltage matching the HCPL2531M specification, with ROHS3 compliance and active status. Suitable for applications requiring maximum isolation margin.

Consideration for Output Voltage Constraints: HCPL-253L-000E (Broadcom Limited) If the application circuit limits output voltage to 7V maximum, this part provides compatible current transfer ratio (19%–50% @ 16mA) with ROHS3 compliance and active status. The 3750Vrms isolation voltage remains adequate for most isolation requirements.

Not Recommended: HCPL-2533 and HCPL-2533-000E These parts feature reduced maximum output voltage (7V vs. 20V) and lower minimum current transfer ratio (15% @ 8mA vs. 19% @ 16mA), introducing functional constraints not present in the original HCPL2531 specification.

Frequently Asked Questions (FAQ)

Q: Can HCPL2531M directly replace HCPL2531 in existing designs? A: Yes. The HCPL2531M maintains identical channel count, package format, current transfer ratio range, and output voltage specifications. The enhanced isolation voltage (5000Vrms vs. 2500Vrms) provides additional safety margin without requiring circuit modification.

Q: What is the primary difference between HCPL-2531-000E and HCPL-2531-020E? A: Both are Broadcom Limited parts with identical electrical performance. The key difference is isolation voltage: HCPL-2531-000E provides 3750Vrms, while HCPL-2531-020E provides 5000Vrms. Selection depends on application isolation requirements.

Q: Are there compliance differences between substitute parts? A: Yes. HCPL2531M, HCPL-2531-000E, HCPL-2531-020E, HCPL-253L-000E, HCPL-4534-000E, and ICPL2531 are ROHS3 compliant. HCPL-2531 and HCPL-2533 are RoHS non-compliant. For applications requiring RoHS compliance, select only ROHS3-compliant alternatives.

Q: Why is HCPL-2533 listed as a substitute if it has different output voltage? A: HCPL-2533 maintains the 2-channel, 8-DIP transistor output configuration and shares the same base product family. However, the 7V maximum output voltage represents a functional constraint compared to the original 20V specification. Use only if application circuits operate within 7V output voltage limits.

Q: What is the significance of turn-on and turn-off time differences? A: The original HCPL2531 specifies 450ns turn-on and 300ns turn-off time. Substitute parts vary: HCPL2531M offers faster switching (250ns, 260ns), while Broadcom alternatives provide 200ns turn-on with 600ns turn-off. Verify switching performance compatibility with application timing requirements.

Q: Is ICPL2531 from Isocom Components a suitable alternative? A: Yes. ICPL2531 provides 5000Vrms isolation voltage, matching current transfer ratio specifications (19%–50% @ 16mA), 20V output voltage, and ROHS3 compliance. Operating temperature range is -40°C to 100°C, which is narrower than the original -55°C to 100°C specification. Confirm application temperature requirements before selection.

Q: Can I use HCPL-4534-000E as a substitute? A: HCPL-4534-000E maintains 2-channel, 8-DIP configuration with 20V output voltage and ROHS3 compliance. However, the minimum current transfer ratio is 15% @ 16mA (vs. 19% for HCPL2531), representing reduced transfer efficiency. Use only if application circuits tolerate lower current transfer ratio.

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