M-OACU AC Output Module Equivalent & Substitute Parts

Part Overview

The M-OACU is an AC output module manufactured by Sensata Technologies, designed to provide isolated AC switching capability with a 4.6A output capacity at 12–140VAC operating range. The module operates from a 15VDC supply and features 8.33ms switching response times. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for system maintenance, redesign, and procurement planning.

Substiute Parts

M-OACU

Sensata TechnologiesIn Stock: 1025M-OACU Datasheet

Current PartRFQ

70M-OAC15

Grayhill Inc.In Stock: 123970M-OAC15 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 70M-OAC15 manufactured by Grayhill Inc. qualifies as a functional substitute based on the following alignment of critical parameters:

Matching Parameters:

• Input voltage: 15VDC (identical)
• Switching response time: 8.33ms turn-on and turn-off (identical)
• Output voltage range: 24–140VAC (overlaps with 12–140VAC range)
• Moisture sensitivity: MSL 1 (Unlimited) (identical)
• REACH compliance status: REACH Unaffected (identical)
• Export classification: EAR99 (identical)
• Form factor: Mini style, black color (identical)

Variance in Output Current: The 70M-OAC15 provides 3A maximum output current compared to the M-OACU's 4.6A. This represents a 14% reduction in current capacity and must be evaluated against application requirements.

Variance in Output Voltage Range: The 70M-OAC15 minimum output voltage is 24VAC, whereas the M-OACU operates from 12VAC. Applications requiring output below 24VAC cannot use this substitute.

Parameter Comparison

Engineering Selection Recommendations

For Active Production or New Designs: The 70M-OAC15 is the appropriate selection when the M-OACU is unavailable. This part carries active product status from Grayhill Inc., ensuring ongoing availability and supply chain stability. The lower input current draw (9 mA versus 44 mA) may provide secondary benefits in power-constrained applications.

Substitution Constraints: The 70M-OAC15 is suitable only when both conditions are met:

1. The application output voltage requirement is 24VAC or higher
2. The application output current requirement does not exceed 3A

Compliance Considerations: Both parts maintain identical REACH and export classification status (REACH Unaffected, EAR99), eliminating regulatory barriers to substitution. The 70M-OAC15 is RoHS non-compliant; verify this status against system-level RoHS requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can the 70M-OAC15 replace the M-OACU in all applications? A: No. The 70M-OAC15 is suitable only for applications requiring output voltage of 24VAC or higher and output current of 3A or less. Applications requiring 12–23VAC output or greater than 3A output current cannot use this substitute.

Q: What is the significance of the input current difference (44 mA vs. 9 mA)? A: The 70M-OAC15 draws significantly less input current, which may reduce power supply loading and heat generation in the control circuit. This is a secondary benefit and does not affect the primary AC output function.

Q: Are there packaging differences between these parts? A: The M-OACU is specified with dash packaging notation, while the 70M-OAC15 is supplied in bulk packaging. Both maintain identical mini form factor and black color. Verify bulk packaging compatibility with your assembly process.

Q: What does "Product Status: Obsolete" mean for the M-OACU? A: Obsolete status indicates that Sensata Technologies has discontinued manufacturing and support for this part. The 70M-OAC15 (active status) should be selected for new designs or when existing inventory is depleted.

Q: Are both parts compliant with environmental regulations? A: Both parts carry REACH Unaffected status and EAR99 export classification. However, the 70M-OAC15 is RoHS non-compliant, while the M-OACU status is not specified. Confirm RoHS requirements at the system level before final selection.

Q: What are the switching response characteristics? A: Both parts provide identical 8.33ms turn-on and turn-off times, ensuring equivalent dynamic performance in control applications.