HCPL2531S Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL2531S 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 active equivalent and substitute parts for new designs or ongoing production requirements. The HCPL2531S operates with DC input, transistor output configuration, and is packaged in 8-SMD Gull Wing format suitable for surface mount applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL2531S
Manufacturer	onsemi
Category	Optoisolators
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
Input Type	DC
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	Surface Mount
Package / Case	8-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the HCPL2531S is determined by the following critical parameters:

Number of Channels: Must be 2 channels
Input Type: Must be DC
Output Type: Must be Transistor
Mounting Type: Must be Surface Mount
Package / Case: Must be 8-SMD, Gull Wing or compatible DIP Gull Wing variant
Voltage - Isolation: Minimum 2500Vrms (higher ratings are acceptable)
Current Transfer Ratio: Must maintain 19% minimum @ 16mA
Output Voltage (Max): Must support 20V
Output Current / Channel: Must support 8mA
Operating Temperature Range: Must cover -55°C ~ 100°C or equivalent

Substitute parts are grouped into two categories:

Category 1 - Direct Functional Equivalents (Higher Isolation Voltage): Parts with isolation voltage ratings of 3750Vrms or 5000Vrms provide enhanced isolation performance while maintaining all other electrical and mechanical specifications.

Category 2 - Active Status Alternatives: Parts with active product status from Broadcom Limited and Fairchild Semiconductor, offering improved availability and supply chain continuity compared to the obsolete onsemi original.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	Channels	CTR Min @ 16mA	CTR Max @ 16mA	Turn On / Turn Off Time (ns)	Output Voltage Max	Output Current / Channel	Operating Temp	Package	Product Status	RoHS Status
HCPL2531S	onsemi	2500Vrms	2	19%	50%	450, 300	20V	8mA	-55°C ~ 100°C	8-SMD, Gull Wing	Obsolete	ROHS3 Compliant
HCPL2531SM	Fairchild Semiconductor	5000Vrms	2	19%	50%	250, 260	20V	8mA	-40°C ~ 100°C	8-SMD, Gull Wing	Active	Not specified
HCPL-2531#300	Broadcom Limited	3750Vrms	2	19%	50%	200, 600	20V	8mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active	RoHS non-compliant
HCPL-2531#320	Broadcom Limited	5000Vrms	2	19%	50%	200, 600	20V	8mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active	RoHS non-compliant
HCPL-2531#500	Broadcom Limited	3750Vrms	2	19%	50%	200, 600	20V	8mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active	RoHS non-compliant
HCPL-2531-300E	Broadcom Limited	3750Vrms	2	19%	50%	200, 600	20V	8mA	-55°C ~ 100°C	8-DIP Gull Wing	Active	ROHS3 Compliant
HCPL-2531-320E	Broadcom Limited	5000Vrms	2	19%	50%	200, 600	20V	8mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active	ROHS3 Compliant
HCPL-2531-360E	Broadcom Limited	3750Vrms	2	19%	50%	200, 600	20V	8mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active	ROHS3 Compliant
HCPL-2531-500E	Broadcom Limited	3750Vrms	2	19%	50%	200, 600	20V	8mA	-55°C ~ 100°C	8-DIP Gull Wing	Active	ROHS3 Compliant
HCPL-2531-520E	Broadcom Limited	5000Vrms	2	19%	50%	200, 600	20V	8mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active	ROHS3 Compliant
HCPL-2531-560E	Broadcom Limited	3750Vrms	2	19%	50%	200, 600	20V	8mA	-55°C ~ 100°C	8-SMD, Gull Wing	Active	ROHS3 Compliant

Engineering Selection Recommendations

For RoHS3 Compliant Applications with 8-SMD Gull Wing Package:

HCPL-2531-320E and HCPL-2531-520E are preferred substitutes. Both parts maintain ROHS3 compliance, support 5000Vrms isolation voltage, and are available in the original 8-SMD Gull Wing package. These parts are manufactured by Broadcom Limited with active product status, ensuring long-term supply availability.

For RoHS3 Compliant Applications with Alternative Package Acceptance:

HCPL-2531-300E, HCPL-2531-360E, and HCPL-2531-560E provide ROHS3 compliance with 3750Vrms isolation voltage. HCPL-2531-300E and HCPL-2531-500E are available in 8-DIP Gull Wing package format, suitable for applications where package footprint flexibility exists.

For Non-RoHS Constrained Applications:

HCPL-2531#300, HCPL-2531#320, and HCPL-2531#500 from Broadcom Limited offer active product status with isolation voltages ranging from 3750Vrms to 5000Vrms. These parts maintain compatibility with the original electrical specifications while providing improved supply chain continuity.

For Fairchild Semiconductor Sourcing:

HCPL2531SM provides 5000Vrms isolation voltage with active product status. Operating temperature range is -40°C ~ 100°C, which is narrower than the original -55°C ~ 100°C specification and must be evaluated against application requirements.

Frequently Asked Questions (FAQ)

Q: Can HCPL-2531-300E be used as a direct replacement for HCPL2531S in existing designs?

A: HCPL-2531-300E is electrically compatible with HCPL2531S. Both parts maintain 2-channel configuration, DC input, transistor output, 19-50% current transfer ratio, 20V maximum output voltage, and 8mA output current per channel. The primary difference is package format: HCPL-2531-300E uses 8-DIP Gull Wing versus the original 8-SMD Gull Wing. PCB layout modification is required for package conversion.

Q: What is the significance of isolation voltage differences between 2500Vrms, 3750Vrms, and 5000Vrms?

A: Isolation voltage rating indicates the maximum voltage differential that can be safely applied across the isolation barrier. All substitute parts with 3750Vrms or 5000Vrms ratings exceed the original 2500Vrms specification, providing enhanced isolation performance. Selection depends on application isolation requirements; higher ratings do not negatively impact performance in lower-voltage applications.

Q: Are HCPL-2531#300, HCPL-2531#320, and HCPL-2531#500 interchangeable?

A: These parts are electrically interchangeable within the same isolation voltage class. HCPL-2531#300 and HCPL-2531#500 both provide 3750Vrms isolation, while HCPL-2531#320 provides 5000Vrms. The suffix designations (#300, #320, #500) indicate packaging and tape format variations. All three maintain identical electrical performance parameters.

Q: Why do some substitute parts show RoHS non-compliant status?

A: RoHS compliance status reflects regulatory certification at the time of manufacture. HCPL-2531#300, HCPL-2531#320, and HCPL-2531#500 are marked as RoHS non-compliant, while HCPL-2531-300E, HCPL-2531-320E, HCPL-2531-360E, HCPL-2531-500E, and HCPL-2531-520E are ROHS3 compliant. For applications requiring RoHS3 certification, select parts explicitly marked as ROHS3 Compliant.

Q: What is the impact of turn-on/turn-off time differences between HCPL2531S (450ns, 300ns) and substitute parts (200ns, 600ns)?

A: Turn-on and turn-off times define switching speed characteristics. HCPL2531S exhibits faster turn-on (450ns) compared to most substitutes (200ns), while turn-off times vary (300ns original versus 600ns for most substitutes). These timing differences must be evaluated against application switching frequency and signal integrity requirements. Faster switching may reduce propagation delay; slower switching may increase transition time.

Q: Can HCPL2531SM from Fairchild Semiconductor be used in applications requiring -55°C operation?

A: HCPL2531SM specifies operating temperature range of -40°C ~ 100°C, which does not include -55°C operation. The original HCPL2531S and most Broadcom Limited substitutes support -55°C ~ 100°C. For applications requiring -55°C minimum operating temperature, HCPL2531SM is not suitable; select alternatives with -55°C ~ 100°C rating.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message