MOC8112M Equivalent & Substitute Parts

Part Overview

The MOC8112M is a transistor output optoisolator manufactured by onsemi, designed for high-voltage isolation applications requiring 7500Vpk isolation capability. This component features a single channel configuration in a 6-DIP package and is rated for operating temperatures from -40°C to 100°C. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

MOC8112M

onsemiIn Stock: 2460MOC8112M Datasheet

Current PartRFQ

CNY17F2M

Fairchild SemiconductorIn Stock: 5459CNY17F2M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MOC8112M optoisolator is determined by the following critical parameters:

Isolation Voltage: The MOC8112M provides 7500Vpk isolation. Substitute parts must maintain equivalent or superior isolation voltage ratings to ensure safe operation in high-voltage isolation circuits.

Package Configuration: The 6-DIP through-hole package is a primary compatibility requirement. Substitute parts must use identical package geometry to ensure direct board-level replacement without redesign.

Output Type and Electrical Characteristics: Single-channel transistor output configuration with maximum output voltage of 70V and saturation voltage of 400mV must be preserved. Current transfer ratio, forward voltage, and maximum forward current define the input-output signal transfer characteristics.

Operating Temperature Range: The -40°C to 100°C operating range must be maintained or exceeded to ensure functionality across the intended application environment.

The CNY17F2M from Fairchild Semiconductor is identified as a substitute part. While its isolation voltage rating (4170Vrms) is lower than the MOC8112M (7500Vpk), it maintains the same package type, single-channel transistor output configuration, identical maximum output voltage (70V), matching saturation voltage (400mV), and compatible operating temperature range. The CNY17F2M is currently in active production status.

Parameter Comparison

Engineering Selection Recommendations

The MOC8112M is obsolete and no longer manufactured by onsemi. The CNY17F2M from Fairchild Semiconductor is an active production alternative that shares the same 6-DIP package footprint and core electrical characteristics (transistor output, 70V maximum output voltage, 400mV saturation voltage, and -40°C to 100°C operating range).

The primary difference is isolation voltage rating: the MOC8112M specifies 7500Vpk while the CNY17F2M specifies 4170Vrms. Applications requiring the full 7500Vpk isolation capability of the original part may require evaluation of the lower isolation rating in the CNY17F2M. Applications with isolation requirements at or below 4170Vrms can directly substitute the CNY17F2M.

The CNY17F2M demonstrates improved switching performance (faster turn-on/turn-off times) and higher minimum current transfer ratio (63% versus 50%), which may provide operational advantages in signal integrity and noise margin. The reduced maximum forward current (60mA versus 90mA) should be verified against input drive circuit capabilities.

Both parts carry identical compliance certifications (ECCN: EAR99, HTSUS: 8541.49.8000) and are suitable for equivalent regulatory environments.

Frequently Asked Questions (FAQ)

Q: Can the CNY17F2M directly replace the MOC8112M in existing designs?

A: Direct board-level replacement is possible due to identical 6-DIP package geometry and pinout compatibility. However, the isolation voltage difference (4170Vrms versus 7500Vpk) must be evaluated against circuit isolation requirements. If the application requires 7500Vpk isolation, the CNY17F2M may not be suitable.

Q: What is the difference between Vpk and Vrms isolation ratings?

A: Vpk (peak voltage) and Vrms (RMS voltage) are different measurement standards for isolation voltage. Direct numerical comparison requires conversion based on the waveform characteristics of the isolation barrier test. The MOC8112M specification of 7500Vpk and CNY17F2M specification of 4170Vrms represent different testing methodologies and cannot be directly equated.

Q: Are there performance differences between these parts?

A: Yes. The CNY17F2M exhibits faster switching times (2µs turn-on versus 4.2µs, 3µs turn-off versus 23µs) and higher current transfer ratio (63% minimum versus 50% minimum). The CNY17F2M has lower maximum forward current (60mA versus 90mA), which may affect input drive circuit design.

Q: Is the CNY17F2M available in the same packaging options?

A: Both parts are supplied in 6-DIP (0.300", 7.62mm) through-hole packages. The MOC8112M was available in bulk packaging, while the CNY17F2M is currently available in bulk packaging. Package geometry and pin spacing are identical.

Q: What compliance certifications apply to these parts?

A: Both the MOC8112M and CNY17F2M carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications, indicating equivalent regulatory treatment for export and tariff purposes.