MOC70P2 Equivalent & Substitute Parts

Part Overview

The MOC70P2 is an optical sensor manufactured by onsemi, designed as a through-beam phototransistor with slotted configuration and PC pin mounting. This component operates with a 0.200" (5.08mm) sensing distance and is classified as an unamplified optical sensor. The MOC70P2 is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations where through-beam optical sensing is required.

Key Parameters

Parameter	MOC70P2 Specification
Sensing Distance	0.200" (5.08mm)
Sensing Method	Through-Beam
Output Configuration	Phototransistor
Current - DC Forward (If) (Max)	50 mA
Current - Collector (Ic) (Max)	20 mA
Voltage - Collector Emitter Breakdown (Max)	30 V
Response Time	20µs, 80µs
Operating Temperature Range	-55°C ~ 100°C
Mounting Type	Through Hole, Flange
Package / Case	Slotted, PC Pins
Type	Unamplified
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MOC70P2 is determined by alignment of the following critical parameters:

Sensing Method: Both the main part and substitute must operate on through-beam optical sensing principles
Sensing Distance: Substitute sensing distance must be within acceptable tolerance of the original 0.200" (5.08mm) specification
Voltage Rating: Collector-Emitter breakdown voltage must meet or exceed 30 V
Mounting Configuration: Physical mounting type and pin configuration must be compatible with existing PCB layouts
Package Type: Slotted configuration with PC pins is required for mechanical compatibility

The LTH-301A from Lite-On Inc. qualifies as a substitute based on these parameters. It maintains through-beam sensing methodology, operates at a comparable sensing distance of 0.205" (5.2mm), and provides equivalent voltage rating of 30 V with compatible PC pin slotted mounting.

Parameter Comparison

Parameter	MOC70P2 (onsemi)	LTH-301A (Lite-On Inc.)	Compatibility Notes
Sensing Distance	0.200" (5.08mm)	0.205" (5.2mm)	Distances are equivalent within typical application tolerances
Sensing Method	Through-Beam	Through-Beam	Identical sensing methodology
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	Matched voltage rating
Mounting Type	Through Hole, Flange	Through Hole	Both support through-hole mounting; flange compatibility requires verification
Package / Case	Slotted, PC Pins	Module, PC Pins, Slot Type	Both feature slotted configuration with PC pins
Type	Unamplified	Unamplified	Identical sensor type
Operating Temperature Range	-55°C ~ 100°C	-25°C ~ 85°C	LTH-301A has narrower operating range; suitable for standard industrial applications
Product Status	Obsolete	Active	LTH-301A is currently in active production

Engineering Selection Recommendations

The LTH-301A represents a functionally equivalent substitute for the obsolete MOC70P2 based on matching through-beam sensing methodology, equivalent sensing distance, and identical voltage rating. The substitute maintains unamplified sensor architecture and compatible PC pin slotted packaging.

Key considerations for selection:

Product Availability: The LTH-301A is in active production status, ensuring long-term supply chain continuity compared to the obsolete MOC70P2
Operating Temperature: Applications requiring operation below -25°C or above 85°C should evaluate the narrower temperature range of the LTH-301A against system requirements
Compliance Status: The LTH-301A carries RoHS3 compliance certification, meeting modern regulatory requirements
Current Specifications: The LTH-301A exhibits lower maximum collector current (500 µA vs. 20 mA) and forward current (20 mA vs. 50 mA); circuit designs must accommodate these reduced current ratings

Frequently Asked Questions (FAQ)

Q: Can the LTH-301A directly replace the MOC70P2 in existing designs?

A: The LTH-301A is mechanically and electrically compatible for through-hole PCB mounting with PC pins. However, the reduced current specifications require circuit verification to ensure the application does not exceed the LTH-301A's maximum ratings.

Q: What is the significance of the sensing distance difference (0.200" vs. 0.205")?

A: The 0.005" (0.12mm) difference is negligible for typical through-beam optical sensor applications and falls within standard mechanical tolerances for slot-type sensor housings.

Q: Does the LTH-301A meet the same regulatory requirements as the MOC70P2?

A: The LTH-301A is RoHS3 compliant and carries EAR99 ECCN classification, meeting current regulatory standards. The MOC70P2 is listed as REACH Unaffected. Both components are classified as unlimited moisture sensitivity (MSL 1).

Q: Are there any performance differences in response time?

A: The LTH-301A exhibits faster response time (3µs, 4µs) compared to the MOC70P2 (20µs, 80µs). This represents improved performance and does not create compatibility issues in standard applications.

Q: What mounting considerations apply when substituting these parts?

A: Both components support through-hole mounting with PC pins and slotted configuration. Physical slot dimensions should be verified against PCB design specifications to ensure proper alignment and mechanical fit.

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