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HCPL2531SD Equivalent & Substitute Parts
Part Overview
The HCPL2531SD 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 requirements and production continuity. The part operates with DC input, transistor output configuration, and is packaged in 8-SMD Gull Wing format suitable for surface mount applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Number of Channels | 2 |
| Voltage - Isolation | 2500Vrms |
| Current Transfer Ratio (Min) | 19% @ 16mA |
| Current Transfer Ratio (Max) | 50% @ 16mA |
| Turn On Time (Typ) | 450ns |
| Turn Off Time (Typ) | 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) |
Substitute Part Grouping Explanation
Substitute parts for the HCPL2531SD are classified into two categories based on electrical and mechanical compatibility:
Parametric Equivalent: Parts that maintain identical electrical specifications including isolation voltage (2500Vrms), current transfer ratio range (19%-50% @ 16mA), switching times (450ns on, 300ns off), and operating temperature range (-55°C ~ 100°C). These parts are direct functional replacements with no circuit redesign required.
Similar Parts: Parts that share the same 2-channel transistor output configuration, DC input type, 8-SMD Gull Wing package, and core electrical parameters (current transfer ratio, output voltage, output current, forward voltage) but differ in isolation voltage rating (3750Vrms or 5000Vrms) and switching time characteristics. These parts are suitable for applications where higher isolation voltage provides additional design margin or where switching time differences are acceptable.
The critical parameters determining substitutability are: number of channels (2), input type (DC), output type (transistor), package format (8-SMD Gull Wing), output voltage maximum (20V), output current per channel (8mA), and forward voltage characteristics (1.45V-1.5V typical).
Parameter Comparison
| Parameter | HCPL2531SD (Main) | HCPL2531SDM | HCPL2531SDV | HCPL-2531#300 | HCPL-2531#320 | HCPL-2531#500 | HCPL-2531-300E | HCPL-2531-320E | HCPL-2531-360E | HCPL-2531-500E | HCPL-2531-520E |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | Fairchild Semiconductor | Fairchild Semiconductor | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Voltage - Isolation | 2500Vrms | 5000Vrms | 2500Vrms | 3750Vrms | 5000Vrms | 3750Vrms | 3750Vrms | 5000Vrms | 3750Vrms | 3750Vrms | 5000Vrms |
| Current Transfer Ratio (Min) | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA |
| Current Transfer Ratio (Max) | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA |
| Turn On Time (Typ) | 450ns | 250ns | 450ns | 200ns | 200ns | 200ns | 200ns | 200ns | 200ns | 200ns | 200ns |
| Turn Off Time (Typ) | 300ns | 260ns | 300ns | 600ns | 600ns | 600ns | 600ns | 600ns | 600ns | 600ns | 600ns |
| 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) | 20V | 20V | 20V | 20V | 20V | 20V | 20V | 20V | 20V | 20V | 20V |
| Current - Output / Channel | 8mA | 8mA | 8mA | 8mA | 8mA | 8mA | 8mA | 8mA | 8mA | 8mA | 8mA |
| Voltage - Forward (Vf) (Typ) | 1.45V | 1.45V | 1.45V | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V | 1.5V |
| Current - DC Forward (If) (Max) | 25mA | 25mA | 25mA | 25mA | 25mA | 25mA | 25mA | 25mA | 25mA | 25mA | 25mA |
| Operating Temperature | -55°C ~ 100°C | -40°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -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 | 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 | 8-DIP Gull Wing | 8-SMD, Gull Wing | 8-SMD, Gull Wing | 8-DIP Gull Wing | 8-SMD, Gull Wing |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | Not specified | Not specified | RoHS non-compliant | RoHS non-compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Parametric Equivalent): HCPL2531SDV is the primary parametric equivalent, maintaining identical isolation voltage (2500Vrms), switching characteristics (450ns on, 300ns off), and operating temperature range (-55°C ~ 100°C). This part is manufactured by Fairchild Semiconductor with active product status and ROHS3 compliance. HCPL2531SDV is suitable for direct substitution without circuit modification.
Higher Isolation Voltage Alternatives: HCPL2531SDM (5000Vrms, Fairchild Semiconductor, active status) provides enhanced isolation margin with faster switching times (250ns on, 260ns off) but operates at a reduced temperature minimum of -40°C. HCPL-2531-320E and HCPL-2531-520E (both 5000Vrms, Broadcom Limited, active status, ROHS3 compliant) offer the same isolation upgrade with standard switching characteristics (200ns on, 600ns off).
Intermediate Isolation Voltage Options: HCPL-2531#300, HCPL-2531#500, HCPL-2531-300E, HCPL-2531-360E, and HCPL-2531-500E all provide 3750Vrms isolation with faster turn-on (200ns) but slower turn-off (600ns) compared to the original part. HCPL-2531-300E and HCPL-2531-500E are ROHS3 compliant with active status. HCPL-2531#300 and HCPL-2531#500 are RoHS non-compliant.
Package Consideration: HCPL-2531-300E and HCPL-2531-500E are packaged in 8-DIP Gull Wing format rather than 8-SMD, requiring PCB layout modification. All other alternatives maintain the 8-SMD Gull Wing package compatible with the original design.
Frequently Asked Questions (FAQ)
Q: Can HCPL2531SDV be used as a direct replacement for HCPL2531SD?
A: Yes. HCPL2531SDV is a parametric equivalent with identical isolation voltage (2500Vrms), current transfer ratio (19%-50% @ 16mA), switching times (450ns on, 300ns off), and operating temperature range (-55°C ~ 100°C). No circuit redesign is required.
Q: What is the difference between HCPL2531SDV and HCPL-2531-320E?
A: HCPL2531SDV maintains 2500Vrms isolation with 450ns/300ns switching times. HCPL-2531-320E provides higher 5000Vrms isolation with faster turn-on (200ns) but slower turn-off (600ns). Both maintain identical current transfer ratio, output voltage, and output current specifications. HCPL-2531-320E is ROHS3 compliant with active product status.
Q: Are there RoHS compliance differences among substitute parts?
A: Yes. HCPL2531SDV, HCPL-2531-300E, HCPL-2531-320E, HCPL-2531-360E, and HCPL-2531-500E are ROHS3 compliant. HCPL-2531#300, HCPL-2531#320, and HCPL-2531#500 are RoHS non-compliant. HCPL2531SDM compliance status is not specified. Design requirements for RoHS compliance should guide part selection.
Q: Can I use parts with different isolation voltages (3750Vrms or 5000Vrms) in place of the 2500Vrms original?
A: Yes, from an electrical functionality standpoint. Higher isolation voltage ratings provide additional design margin and are electrically compatible. However, switching time characteristics differ: 3750Vrms and 5000Vrms variants have 200ns turn-on and 600ns turn-off compared to the original 450ns/300ns. Verify that these timing differences are acceptable for your application.
Q: What is the impact of package format differences?
A: HCPL-2531-300E and HCPL-2531-500E use 8-DIP Gull Wing packaging instead of 8-SMD. This requires PCB layout modification and different mounting procedures. All other alternatives maintain the 8-SMD Gull Wing format compatible with the original design footprint.
Q: Which substitute part has the best availability?
A: HCPL2531SDV has the highest inventory (99,900 pcs) among all listed alternatives, followed by HCPL-2531-500E (2,400 pcs) and HCPL-2531-320E (2,266 pcs). Inventory levels should be confirmed with suppliers for current availability.
Q: Are all substitute parts currently in active production?
A: All listed substitute parts except the original HCPL2531SD (obsolete) have active product status. This ensures long-term availability and continued manufacturer support for technical documentation and quality assurance.
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