HCPL2531SV Equivalent & Substitute Parts

Part Overview

The HCPL2531SV is a 2-channel optoisolator with transistor output manufactured by onsemi, rated for 2500Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 100°C and is packaged in 8-SMD Gull Wing configuration for surface mount applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL2531SV
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
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the HCPL2531SV are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent (Direct Replacement): The HCPL2531SDV by Fairchild Semiconductor maintains identical electrical specifications including 2500Vrms isolation voltage, 19-50% current transfer ratio at 16mA, 450ns/300ns turn-on/turn-off times, 20V maximum output voltage, and 8mA output current per channel. This part is classified as active and provides direct functional substitution with matching performance characteristics.

Similar Substitutes (Higher Isolation Voltage): The HCPL-2533-300E, HCPL-2533-500E, HCPL-253L-500E, and HCPL-253L-520E by Broadcom Limited offer enhanced isolation voltage ratings (3750Vrms to 5000Vrms) while maintaining 2-channel configuration, 8mA output current per channel, and compatible operating temperature range. These parts are active products with RoHS3 compliance. The HCPL-253L series additionally matches the current transfer ratio specifications (19-50% @ 16mA) and turn-on/turn-off timing (200ns/600ns) of the original part.

Parameter Comparison

Parameter	HCPL2531SV (Main)	HCPL2531SDV	HCPL-2533-300E	HCPL-2533-500E	HCPL-253L-500E	HCPL-253L-520E
Manufacturer	onsemi	Fairchild Semiconductor	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Product Status	Obsolete	Active	Active	Active	Active	Active
Number of Channels	2	2	2	2	2	2
Voltage - Isolation	2500Vrms	2500Vrms	3750Vrms	3750Vrms	3750Vrms	5000Vrms
Current Transfer Ratio (Min)	19% @ 16mA	19% @ 16mA	15% @ 8mA	15% @ 8mA	19% @ 16mA	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA	50% @ 16mA	—	—	50% @ 16mA	50% @ 16mA
Turn On / Turn Off Time (Typ)	450ns, 300ns	450ns, 300ns	800ns, 1µs	800ns, 1µs	200ns, 600ns	200ns, 600ns
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	20V	20V	7V	7V	7V	7V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.45V	1.45V	1.5V	1.5V	1.5V	1.5V
Current - DC Forward (If) (Max)	25mA	25mA	25mA	25mA	25mA	25mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing
RoHS Status	—	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	—	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Active): The HCPL2531SDV by Fairchild Semiconductor is the primary substitute for the obsolete HCPL2531SV. This part maintains all electrical and mechanical specifications, ensuring pin-for-pin compatibility and identical circuit performance. The HCPL2531SDV is actively manufactured and available in high inventory quantities.

For Enhanced Isolation Requirements: When circuit design permits higher isolation voltage ratings, the HCPL-253L-500E and HCPL-253L-520E by Broadcom Limited provide superior isolation performance (3750Vrms and 5000Vrms respectively) while preserving the critical current transfer ratio specifications (19-50% @ 16mA) and improved switching times (200ns/600ns). These parts carry RoHS3 compliance certification, meeting modern environmental standards.

For Standard Isolation Applications: The HCPL-2533-300E and HCPL-2533-500E offer 3750Vrms isolation with active product status and RoHS3 compliance. These parts are suitable for applications where the original 2500Vrms specification can be exceeded without circuit modification. Note that these variants specify 15% minimum current transfer ratio at 8mA, differing from the original part's 19% specification at 16mA.

Frequently Asked Questions (FAQ)

Q: Can HCPL2531SDV directly replace HCPL2531SV in existing designs? A: Yes. The HCPL2531SDV maintains identical electrical specifications including isolation voltage (2500Vrms), current transfer ratio (19-50% @ 16mA), switching times (450ns/300ns), and output characteristics (20V maximum, 8mA per channel). The 8-SMD Gull Wing package is mechanically compatible.

Q: What is the primary difference between HCPL-253L and HCPL-2533 series substitutes? A: The HCPL-253L series matches the original part's current transfer ratio specifications (19-50% @ 16mA) and provides faster switching times (200ns/600ns). The HCPL-2533 series specifies 15% minimum current transfer ratio at 8mA with slower switching times (800ns/1µs). Both offer higher isolation voltages than the original part.

Q: Are the Broadcom substitutes compatible with the original circuit layout? A: All substitute parts maintain the 8-SMD Gull Wing package configuration and identical pin count (8 pins). However, the maximum output voltage differs: HCPL2531SV and HCPL2531SDV support 20V maximum output, while Broadcom substitutes are rated for 7V maximum output. Circuit designs must accommodate this specification difference.

Q: Which substitute offers the best compliance for modern manufacturing? A: All active Broadcom substitutes (HCPL-2533-300E, HCPL-2533-500E, HCPL-253L-500E, HCPL-253L-520E) carry RoHS3 compliance certification. The HCPL2531SDV does not specify RoHS status in available documentation.

Q: What isolation voltage should be selected for new designs? A: Selection depends on circuit requirements. The HCPL-253L-520E provides maximum isolation at 5000Vrms. The HCPL-253L-500E and HCPL-2533-500E offer 3750Vrms. The HCPL2531SDV maintains the original 2500Vrms specification. Higher isolation ratings provide design margin but do not reduce performance in lower-voltage applications.

Q: Are there inventory considerations when selecting substitutes? A: HCPL2531SDV shows highest availability at 99,900 pieces. HCPL-253L-520E has 686 pieces available. HCPL-253L-500E has 971 pieces. HCPL-2533-500E has 997 pieces. HCPL-2533-300E has 6,000 pieces. Inventory levels should be confirmed with suppliers for production requirements.

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