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HCPL-4503 Equivalent & Substitute Parts
Part Overview
The HCPL-4503 is an optoisolator with transistor output manufactured by Broadcom Limited, rated for 3750Vrms isolation voltage in an 8-DIP through-hole package. This component is classified as Active product status and is used in applications requiring galvanic isolation between input and output circuits with DC input control and transistor switching output.
Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameters. Alternative sources and variants are documented to support procurement flexibility, inventory management, and design continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | HCPL-4503 |
| Manufacturer | Broadcom Limited |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 3750Vrms |
| Current Transfer Ratio (Min) | 19% @ 16mA |
| Current Transfer Ratio (Max) | 50% @ 16mA |
| Turn On / Turn Off Time (Typ) | 200ns, 600ns |
| Input Type | DC |
| Output Type | Transistor |
| Voltage - Output (Max) | 20V |
| Current - Output / Channel | 8mA |
| Voltage - Forward (Vf) (Typ) | 1.5V |
| Current - DC Forward (If) (Max) | 25mA |
| Operating Temperature | -55°C ~ 100°C |
| Mounting Type | Through Hole |
| Package / Case | 8-DIP (0.300", 7.62mm) |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the HCPL-4503 are classified based on the following critical parameters that determine functional equivalence:
Primary Equivalence Criteria:
- Number of Channels: 1
- Input Type: DC
- Output Type: Transistor (or Transistor with Base)
- Mounting Type: Through Hole
- Package / Case: 8-DIP (0.300", 7.62mm)
- Current Transfer Ratio (Min): 19% @ 16mA
- Current Transfer Ratio (Max): 50% @ 16mA
- Voltage - Output (Max): 20V or higher
- Current - Output / Channel: 8mA
- Current - DC Forward (If) (Max): 25mA
Substitution Categories:
Category 1: Parametric Equivalents (Broadcom Limited) Parts HCPL-4502-000E, HCPL-4503-000E, and HCPL-4502 maintain identical electrical specifications and package configuration. These variants differ in RoHS compliance status and turn-on/turn-off timing characteristics but preserve core isolation voltage and switching performance.
Category 2: Manufacturer Recommended Alternatives Parts HCPL4503M (onsemi) and SFH6345 (Vishay Semiconductor Opto Division) provide higher isolation voltage ratings (5000Vrms and 5300Vrms respectively) while maintaining compatible current transfer ratios, output voltage ratings, and package form factors. These alternatives support applications with enhanced isolation requirements.
Parameter Comparison
| Parameter | HCPL-4503 | HCPL-4502-000E | HCPL-4503-000E | HCPL4503M | SFH6345 | HCPL-4502 |
|---|---|---|---|---|---|---|
| Manufacturer | Broadcom Limited | Broadcom Limited | Broadcom Limited | onsemi | Vishay Semiconductor Opto Division | Broadcom Limited |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Isolation | 3750Vrms | 3750Vrms | 3750Vrms | 5000Vrms | 5300Vrms | 3750Vrms |
| Current Transfer Ratio (Min) | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA | 19% @ 16mA |
| Current Transfer Ratio (Max) | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | 50% @ 16mA | Not specified | 50% @ 16mA |
| Turn On / Turn Off Time (Typ) | 200ns, 600ns | 200ns, 600ns | 1µs, 1µs (Max) | 250ns, 260ns | 300ns, 300ns | 200ns, 600ns |
| Input Type | DC | DC | DC | DC | DC | DC |
| Output Type | Transistor | Transistor | Transistor | Transistor with Base | Transistor | Transistor |
| Voltage - Output (Max) | 20V | 20V | 20V | 20V | 25V | 20V |
| Current - Output / Channel | 8mA | 8mA | 8mA | 8mA | 8mA | 8mA |
| Voltage - Forward (Vf) (Typ) | 1.5V | 1.5V | 1.5V | 1.45V | 1.33V | 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 | -40°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Package / Case | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | Not Applicable | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
For RoHS3 Compliant Applications: HCPL-4502-000E, HCPL-4503-000E, HCPL4503M, and SFH6345 are all ROHS3 compliant and suitable for designs requiring environmental compliance. HCPL-4503 and HCPL-4502 are RoHS non-compliant and should be selected only when legacy component specifications are mandated.
For Standard Isolation Voltage (3750Vrms): HCPL-4502-000E, HCPL-4503-000E, and HCPL-4502 maintain the original 3750Vrms isolation rating. These parts are direct parametric equivalents with identical switching performance characteristics.
For Enhanced Isolation Voltage: HCPL4503M (5000Vrms) and SFH6345 (5300Vrms) provide higher isolation margins. These alternatives are suitable for applications with elevated isolation requirements while maintaining compatible electrical performance across current transfer ratio, output voltage, and output current specifications.
For Operating Temperature Range: HCPL-4503, HCPL-4502-000E, HCPL-4503-000E, HCPL-4502, and SFH6345 support the full -55°C to 100°C operating range. HCPL4503M operates from -40°C to 100°C and is suitable for applications not requiring the extended lower temperature specification.
For Switching Speed: HCPL-4503, HCPL-4502-000E, and HCPL-4502 provide the fastest turn-on/turn-off times (200ns/600ns). HCPL4503M (250ns/260ns) and SFH6345 (300ns/300ns) have slightly longer switching times but remain compatible with standard DC switching applications.
Frequently Asked Questions (FAQ)
Q: Can HCPL-4502-000E be used as a direct replacement for HCPL-4503?
A: Yes. HCPL-4502-000E maintains identical isolation voltage (3750Vrms), current transfer ratio (19% to 50% @ 16mA), output voltage rating (20V), output current (8mA), and package configuration (8-DIP through-hole). The primary difference is RoHS3 compliance status. Switching times are identical (200ns turn-on, 600ns turn-off).
Q: What is the difference between HCPL-4503-000E and HCPL-4503?
A: Both parts share the same isolation voltage, current transfer ratio, output specifications, and package. HCPL-4503-000E is ROHS3 compliant while HCPL-4503 is RoHS non-compliant. HCPL-4503-000E has maximum turn-on/turn-off times of 1µs compared to typical values of 200ns/600ns for HCPL-4503.
Q: Can HCPL4503M replace HCPL-4503 in all applications?
A: HCPL4503M is compatible for applications requiring the specified electrical performance. It provides higher isolation voltage (5000Vrms versus 3750Vrms) and includes a base connection on the transistor output. Operating temperature range is -40°C to 100°C (versus -55°C to 100°C for HCPL-4503). Applications requiring the full -55°C lower temperature specification must use HCPL-4503 or equivalent Broadcom parts.
Q: Is SFH6345 a suitable substitute for HCPL-4503?
A: SFH6345 is compatible based on current transfer ratio (19% @ 16mA minimum), output current (8mA), and package configuration (8-DIP through-hole). It provides higher isolation voltage (5300Vrms) and maximum output voltage (25V). Switching times are slightly longer (300ns turn-on and turn-off). SFH6345 is manufactured by Vishay Semiconductor Opto Division and is ROHS3 compliant.
Q: What are the key parameters that determine substitution compatibility?
A: Substitution compatibility is determined by: single channel configuration, DC input type, transistor output type, 8-DIP through-hole package, current transfer ratio range (19% to 50% @ 16mA), maximum output voltage of 20V or higher, output current of 8mA, and maximum forward current of 25mA. Isolation voltage may be equal or higher than the original specification.
Q: Are all substitute parts available in the same packaging?
A: Yes. All substitute parts listed are available in 8-DIP (0.300", 7.62mm) through-hole package configuration, ensuring mechanical compatibility with existing PCB designs and socket configurations.
Q: What is the significance of the Moisture Sensitivity Level (MSL) rating?
A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. HCPL4503M is listed as Not Applicable, indicating it does not have moisture sensitivity constraints. All parts in this comparison are suitable for standard storage conditions.
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