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HCPL-J312 Equivalent & Substitute Parts
Part Overview
The HCPL-J312 is a 1-channel optical isolation gate driver manufactured by Broadcom Limited, designed for high-voltage switching applications requiring galvanic isolation. This device provides 3750Vrms isolation voltage with 2.5A peak output current in an 8-DIP through-hole package. The part is currently active in production with 30,300 units in stock.
Substitute parts become necessary when the HCPL-J312 reaches end-of-life status, when inventory constraints occur, or when design requirements call for enhanced electrical performance within compatible package and pinout specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Isolation Voltage | 3750 | Vrms |
| Number of Channels | 1 | — |
| Peak Output Current | 2.5 | A |
| Common Mode Transient Immunity (Min) | 25 | kV/µs |
| Propagation Delay (Max) | 500 | ns |
| Package Type | 8-DIP (0.300", 7.62mm) | — |
| Operating Temperature Range | -40 to 100 | °C |
| Output Supply Voltage | 15–30 | V |
Substitute Part Grouping Explanation
Substitute parts for the HCPL-J312 must meet the following criteria:
- Single-channel optical isolation gate driver architecture
- 8-DIP through-hole package with 0.300" (7.62mm) body dimensions
- Isolation voltage minimum 3750Vrms (equal or higher)
- Peak output current minimum 2.5A (equal or higher)
- Output supply voltage range 15–30V compatibility
- Operating temperature range -40°C to 100°C or broader
- Common mode transient immunity minimum 25kV/µs (equal or higher)
The FOD3120 and FOD3120V from onsemi satisfy all substitution criteria. Both devices exceed the isolation voltage specification (5000Vrms vs. 3750Vrms), provide higher peak output current (3A vs. 2.5A), and deliver improved common mode transient immunity (35kV/µs vs. 25kV/µs). Both maintain identical package geometry and pinout compatibility.
Parameter Comparison
| Parameter | HCPL-J312 (Broadcom) | FOD3120 (onsemi) | FOD3120V (onsemi) | Unit |
|---|---|---|---|---|
| Isolation Voltage | 3750 | 5000 | 5000 | Vrms |
| Number of Channels | 1 | 1 | 1 | — |
| Peak Output Current | 2.5 | 3 | 3 | A |
| Common Mode Transient Immunity (Min) | 25 | 35 | 35 | kV/µs |
| Propagation Delay (Max) | 500 | 400 | 400 | ns |
| Pulse Width Distortion (Max) | 300 | 100 | 100 | ns |
| Rise / Fall Time (Typ) | 100 / 100 | 60 / 60 | 60 / 60 | ns |
| Output Supply Voltage | 15–30 | 15–30 | 15–30 | V |
| Operating Temperature | -40 to 100 | -40 to 100 | -40 to 100 | °C |
| Package / Case | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | — |
| Mounting Type | Through Hole | Through Hole | Through Hole | — |
Engineering Selection Recommendations
FOD3120 and FOD3120V are direct functional equivalents to the HCPL-J312 with superior electrical performance across all critical parameters. Both substitute parts are active products with confirmed production status.
FOD3120 carries UL approval and is RoHS3 compliant. This variant is suitable for applications requiring regulatory compliance with North American standards.
FOD3120V carries both IEC and UL approvals and is RoHS3 compliant. This variant provides broader international regulatory coverage and is recommended for applications requiring European or global certification pathways.
The HCPL-J312 is RoHS non-compliant, whereas both FOD3120 variants meet RoHS3 requirements. For new designs or applications with RoHS compliance mandates, FOD3120 or FOD3120V are the appropriate selections.
Frequently Asked Questions (FAQ)
Q: Can FOD3120 or FOD3120V be used as direct pin-for-pin replacements for HCPL-J312?
A: Yes. Both substitute parts use identical 8-DIP package geometry (0.300", 7.62mm) and maintain through-hole mounting compatibility. Pinout alignment is preserved for direct board-level substitution.
Q: What are the key performance improvements when substituting to FOD3120 or FOD3120V?
A: The substitute parts deliver higher isolation voltage (5000Vrms vs. 3750Vrms), increased peak output current (3A vs. 2.5A), faster propagation delay (400ns vs. 500ns), and superior common mode transient immunity (35kV/µs vs. 25kV/µs). Pulse width distortion is reduced from 300ns to 100ns, and rise/fall times improve from 100ns to 60ns.
Q: Which substitute part should be selected for RoHS-compliant applications?
A: Both FOD3120 and FOD3120V are RoHS3 compliant. FOD3120 is recommended for applications requiring UL certification. FOD3120V is recommended for applications requiring both IEC and UL certifications or broader international regulatory coverage.
Q: Are the output supply voltage requirements identical across all three parts?
A: Yes. HCPL-J312, FOD3120, and FOD3120V all operate with output supply voltage in the 15–30V range and maintain identical operating temperature specifications (-40°C to 100°C).
Q: What is the inventory status of substitute parts?
A: FOD3120 has 17,300 units in stock. FOD3120V has 2,067 units in stock. Both are available as new original components in tube packaging.
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