OPI125 Equivalent & Substitute Parts

Part Overview

The OPI125 is a logic output optoisolator manufactured by TT Electronics/Optek Technology, designed for 15000VDC isolation applications with push-pull totem pole output configuration. This component operates at 250kbps data rate and is rated for -55°C to 100°C operating temperature range. The OPI125 is currently classified as obsolete, making identification of active equivalent parts essential for ongoing system support and new design implementations.

Substiute Parts

OPI125

TT Electronics/Optek TechnologyIn Stock: 1013OPI125 Datasheet

Current PartRFQ

OPI126

TT Electronics/Optek TechnologyIn Stock: 1037OPI126 Datasheet

MFR RecommendedRFQ

OPI127-032

TT Electronics/Optek TechnologyIn Stock: 991OPI127-032 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OPI125 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Voltage isolation rating: 15000VDC
• Number of channels: 1
• Input type: DC
• Data rate: 250kbps
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -55°C ~ 100°C
• Mounting type: Through Hole
• RoHS3 compliance and MSL rating

Output Configuration Consideration: The OPI125 features push-pull totem pole output. The OPI127-032 maintains identical output configuration, while the OPI126 provides open collector output as an alternative topology. Both substitute parts meet all isolation, speed, and environmental specifications.

Parameter Comparison

Engineering Selection Recommendations

OPI127-032 (Preferred Direct Replacement) The OPI127-032 is the primary substitute for the OPI125. Both parts share identical output topology (push-pull totem pole), electrical specifications, and thermal ratings. The OPI127-032 is currently in active production status with confirmed inventory availability. This part maintains full functional and pin-compatible equivalence for direct board-level substitution.

OPI126 (Alternative with Output Configuration Change) The OPI126 provides equivalent isolation voltage, data rate, and thermal performance but implements open collector output topology instead of push-pull. Selection of the OPI126 requires circuit redesign to accommodate the output configuration difference. The OPI126 is in active production status. This option is suitable only when circuit topology permits open collector operation.

Both substitute parts maintain ROHS3 compliance and MSL rating 1 (unlimited moisture sensitivity), ensuring compatibility with standard manufacturing and storage environments.

Frequently Asked Questions (FAQ)

Q: Can the OPI126 be used as a direct replacement for the OPI125? A: The OPI126 meets all electrical and isolation specifications but features open collector output instead of push-pull totem pole. Direct substitution requires circuit modification to accommodate the different output topology. If the application circuit is designed for push-pull output, the OPI126 will not function without redesign.

Q: Is the OPI127-032 a pin-compatible replacement for the OPI125? A: The OPI127-032 maintains identical output configuration (push-pull totem pole) and electrical specifications. However, the package differs: OPI125 uses Axial - 5 Leads while OPI127-032 uses Axial - 4 Leads. Physical board layout verification is required before implementation.

Q: What is the primary reason for substituting the OPI125? A: The OPI125 is classified as obsolete. The OPI127-032 and OPI126 are active production parts from the same manufacturer, ensuring long-term availability and supply chain continuity.

Q: Are there any compliance differences between the OPI125 and its substitutes? A: All three parts maintain identical RoHS3 compliance status and MSL rating 1 (unlimited). No compliance-related restrictions apply to substitution.

Q: What is the key difference between OPI127-032 and OPI126? A: The primary difference is output configuration. OPI127-032 provides push-pull totem pole output, while OPI126 provides open collector output. All other electrical parameters, isolation voltage, data rate, and thermal specifications are identical.