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H11B255 Equivalent & Substitute Parts
Part Overview
The H11B255 is an optoisolator with Darlington output and base connection, manufactured by onsemi. This component provides 5300Vrms isolation in a 6-DIP through-hole package. The H11B255 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | H11B255 |
| Manufacturer | onsemi |
| Category | Optoisolators |
| Product Status | Obsolete |
| Number of Channels | 1 |
| Voltage - Isolation | 5300Vrms |
| Current Transfer Ratio (Min) | 100% @ 10mA |
| Output Type | Darlington with Base |
| Voltage - Output (Max) | 55V |
| Voltage - Forward (Vf) (Typ) | 1.2V |
| Current - DC Forward (If) (Max) | 100 mA |
| Vce Saturation (Max) | 1V |
| Operating Temperature | -55°C ~ 100°C |
| Package / Case | 6-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole |
| Turn On / Turn Off Time (Typ) | 25µs, 18µs |
Substitute Part Grouping Explanation
Substitution eligibility for the H11B255 is determined by the following critical parameters:
- Package compatibility: 6-DIP (0.300", 7.62mm) through-hole mounting
- Output configuration: Darlington with Base output type
- Isolation voltage: Minimum 5300Vrms
- Input type: DC
- Number of channels: 1 channel
- Electrical characteristics: Current transfer ratio, output voltage rating, and saturation voltage
The H11B1M is identified as a substitute part. While it maintains the same package, mounting type, output configuration, and input type, it operates at a lower isolation voltage (4170Vrms) and has different electrical performance characteristics. The H11B1M is classified as active product status with RoHS3 compliance, contrasting with the obsolete status of the H11B255.
Parameter Comparison
| Parameter | H11B255 (Main Part) | H11B1M (Substitute) |
|---|---|---|
| Manufacturer | onsemi | onsemi |
| Product Status | Obsolete | Active |
| Number of Channels | 1 | 1 |
| Voltage - Isolation | 5300Vrms | 4170Vrms |
| Current Transfer Ratio (Min) | 100% @ 10mA | 500% @ 1mA |
| Output Type | Darlington with Base | Darlington with Base |
| Voltage - Output (Max) | 55V | 30V |
| Current - Output / Channel | Not specified | 150mA |
| Voltage - Forward (Vf) (Typ) | 1.2V | 1.2V |
| Current - DC Forward (If) (Max) | 100 mA | 80 mA |
| Vce Saturation (Max) | 1V | 1V |
| Operating Temperature | -55°C ~ 100°C | -40°C ~ 100°C |
| Package / Case | 6-DIP (0.300", 7.62mm) | 6-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole | Through Hole |
| Turn On / Turn Off Time (Typ) | 25µs, 18µs | 25µs, 18µs |
| RoHS Status | Not specified | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | Not Applicable |
Engineering Selection Recommendations
The H11B255 is obsolete, requiring alternative sourcing for new designs or production continuity. The H11B1M is the identified substitute, offering active product status and RoHS3 compliance.
Selection between these parts depends on application isolation voltage requirements. The H11B255 provides 5300Vrms isolation, while the H11B1M provides 4170Vrms isolation. Applications requiring the full 5300Vrms isolation specification cannot use the H11B1M as a direct substitute.
The H11B1M offers superior current transfer ratio performance (500% @ 1mA versus 100% @ 10mA) but operates at reduced maximum output voltage (30V versus 55V) and lower maximum forward current (80mA versus 100mA). Operating temperature range differs, with the H11B255 supporting -55°C minimum versus -40°C for the H11B1M.
Both parts share identical package geometry, mounting type, output configuration, input type, and switching time characteristics, enabling mechanical and electrical compatibility at the board level when isolation voltage and output specifications align with application requirements.
Frequently Asked Questions (FAQ)
Q: Can the H11B1M directly replace the H11B255 in existing designs?
A: Direct replacement depends on application isolation voltage requirements. If the design requires 5300Vrms isolation, the H11B1M cannot be used as it provides only 4170Vrms. If lower isolation voltage is acceptable, compatibility must be verified against output voltage (30V maximum for H11B1M versus 55V for H11B255) and output current requirements.
Q: Are the packages physically identical?
A: Both parts use 6-DIP (0.300", 7.62mm) through-hole packages with identical pin spacing and mounting requirements. PCB layout compatibility is maintained between the two parts.
Q: What are the key electrical differences?
A: The H11B1M has higher current transfer ratio (500% @ 1mA) compared to the H11B255 (100% @ 10mA), but lower maximum output voltage (30V versus 55V) and lower maximum forward current (80mA versus 100mA). Both maintain identical saturation voltage (1V) and switching times (25µs on, 18µs off).
Q: Does the H11B1M meet current compliance standards?
A: The H11B1M is RoHS3 compliant. The H11B255 compliance status is not specified in available documentation.
Q: What is the operating temperature difference?
A: The H11B255 operates from -55°C to 100°C, while the H11B1M operates from -40°C to 100°C. Applications requiring -55°C minimum operating temperature cannot use the H11B1M.
Q: Why is the H11B255 obsolete?
A: Product status reflects manufacturer discontinuation. The H11B1M represents the active alternative from onsemi's optoisolator product line.
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