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Home > Products > Sensors, Transducers > Optical Sensors > Photointerrupters - Slot Type - Transistor Output

onsemi MOC70P2

Name: MOC70P2
Brand: onsemi
SKU: MOC70P2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MOC70P2

Manufacturer:: onsemi

Category:: Photointerrupters - Slot Type - Transistor Output

Package:: Slotted, PC Pins

Datasheet:: MOC70P2.pdf

Description:: SENSOR OPT SLOT PHOTOTRAN PC PIN

Quantity:: RFQ Add To RFQ list

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Inventory:2,770

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Product details

Overview

MOC70P2 from Fairchild Semiconductor is a phototransistor-based optical interrupter switch with 5 mm sensing gap, transistor output, and PCB mount package. It delivers 0.30 mA minimum on-state collector current at 5 mA LED drive and 10 V V_CE, supports −55°C to +100°C operation, and is used in position detection for industrial encoders and printer paper-path sensors.

For engineers reviewing the MOC70P2 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed I_C(ON) at low LED current, V_CEO = 30 V tolerance, turn-on/turn-off times under 20 µs / 80 µs, and compatibility with 0.100" (2.54 mm) pitch PCB layouts.

Technical Context

The MOC70P2 integrates an infrared GaAs LED emitter optically coupled to an NPN silicon phototransistor in a single molded housing. Its wide-gap design enables non-contact object detection without mechanical wear.

Electrical isolation between input and output exceeds 5000 V_RMS, and it operates with forward LED current up to 50 mA while delivering phototransistor collector current up to 3.0 mA at 30 mA LED drive - confirming its role as a medium-sensitivity digital optical switch for industrial control interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
I_C(ON) @ 5 mA	0.30 mA min - ensures reliable logic-level switching with low-power microcontroller GPIO drive
I_C(ON) @ 30 mA	3.0 mA min - provides sufficient drive margin for TTL/CMOS input stages or small relays
V_CEO	30 V - supports direct interface with 24 V industrial control rails without external clamping
t_ON/t_OFF	20 / 80 µs - enables detection of objects moving at ≤10 kHz interrupt rate in encoder applications
Sensing Gap	5 mm - accommodates mechanical clearances in motor feedback, vending machine coin slots, and printer paper path designs
Operating Temp	−55°C to +100°C - qualified for under-hood automotive modules and factory-floor PLC I/O modules

Pinout & Package

Package: 4-pin DIP-4 (dual in-line package), 0.100" (2.54 mm) lead pitch, low-profile surface-mount compatible body with 0.270" (6.86 mm) height.

Pin/Terminal	Circuit Role	Design Meaning
PIN 1 (ANODE)	LED Anode	Positive terminal of infrared emitter diode; requires series resistor for current limiting from 3.3 V or 5 V supply
PIN 2 (CATHODE)	LED Cathode	Ground return for emitter; polarity-sensitive - reverse connection prevents LED activation
PIN 3 (COLLECTOR)	Phototransistor Collector	Active-high open-collector output; pulled high via external resistor to define logic HIGH level
PIN 4 (EMITTER)	Phototransistor Emitter	Ground reference for phototransistor; tied to system ground to complete output current path

Key Features

Feature	Design Value
No contact sensing	Eliminates mechanical wear and bounce in position detection, enabling >100 million cycle lifetime
5 mm gap	Accommodates thick obstructions or large mechanical tolerances without alignment fixtures
Transistor output	Provides active pull-down capability compatible with standard logic families and microcontroller inputs
PCB mount	Enables automated assembly using standard SMT or through-hole reflow/reflow-compatible processes

Applications

Industrial Encoder Feedback	Printer Paper Path Detection
Use Scenario: Detecting rotation of slotted metal disc in servo motor feedback loop. IC Role / Device Role / Timing Role: Optical interrupter providing edge-triggered pulse train synchronized to shaft position. Use Value: 3.0 mA I_C(ON) at 30 mA LED drive ensures clean TTL-compatible pulses even with aging LED output or dust accumulation.	Use Scenario: Monitoring paper presence and jam condition in laser printer paper feed mechanism. IC Role / Device Role / Timing Role: Digital presence sensor triggering interrupt on paper insertion or blockage. Use Value: 5 mm gap allows robust detection across variable paper thicknesses and misalignment without recalibration.
Vending Machine Coin Validation	Factory Automation Door Interlock
Use Scenario: Verifying coin diameter and material by measuring interruption duration and signal amplitude. IC Role / Device Role / Timing Role: High-reliability optical gate for multi-stage coin discrimination logic. Use Value: −55°C to +100°C rating supports outdoor kiosk deployment in extreme ambient conditions.	Use Scenario: Safety-critical door-open detection on CNC machine enclosure. IC Role / Device Role / Timing Role: Fail-safe position monitor disabling motion when door is unsealed. Use Value: 30 V V_CEO withstands induced transients on factory floor wiring without protection circuitry.

Industrial Encoder Feedback

Printer Paper Path Detection

Use Scenario: Detecting rotation of slotted metal disc in servo motor feedback loop.

IC Role / Device Role / Timing Role: Optical interrupter providing edge-triggered pulse train synchronized to shaft position.

Use Value: 3.0 mA I_C(ON) at 30 mA LED drive ensures clean TTL-compatible pulses even with aging LED output or dust accumulation.

Use Scenario: Monitoring paper presence and jam condition in laser printer paper feed mechanism.

IC Role / Device Role / Timing Role: Digital presence sensor triggering interrupt on paper insertion or blockage.

Use Value: 5 mm gap allows robust detection across variable paper thicknesses and misalignment without recalibration.

Vending Machine Coin Validation

Factory Automation Door Interlock

Use Scenario: Verifying coin diameter and material by measuring interruption duration and signal amplitude.

IC Role / Device Role / Timing Role: High-reliability optical gate for multi-stage coin discrimination logic.

Use Value: −55°C to +100°C rating supports outdoor kiosk deployment in extreme ambient conditions.

Use Scenario: Safety-critical door-open detection on CNC machine enclosure.

IC Role / Device Role / Timing Role: Fail-safe position monitor disabling motion when door is unsealed.

Use Value: 30 V V_CEO withstands induced transients on factory floor wiring without protection circuitry.

Equivalent & Alternatives

The following parts are listed as comparable options for similar optical interrupter switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TCST1103	0.25 mA I_C(ON) @ 5 mA drive; 0.35 mA typical at 20 mA; V_CEO = 20 V	Lower output current and breakdown voltage limit use in 12 V systems only	Select TCST1103 only if cost sensitivity outweighs need for 30 V tolerance and higher I_C(ON)
OPB911T	0.5 mA I_C(ON) @ 10 mA drive; 0.4 V V_CE(SAT); TO-5 metal can package	Higher sensitivity but larger footprint and manual assembly requirement	Choose OPB911T when higher signal margin is needed and DIP-4 PCB layout is not constrained

Compared with TCST1103 and OPB911T, the MOC70P2 offers balanced performance: higher V_CEO than TCST1103 for 24 V industrial use, and smaller DIP-4 footprint than OPB911T for high-density PCBs - making it optimal for space-constrained encoder modules requiring 30 V tolerance.

Availability

MOC70P2 is available at Aetrix Electronics and suitable for industrial encoder feedback, printer paper path detection, vending machine coin validation, and factory automation door interlock requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MOC70P2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer acquired by ON Semiconductor in 2016; its legacy optoelectronics portfolio remains widely deployed in industrial and automotive systems.

The MOC70PX family was designed specifically for rugged, wide-gap optical interrupter applications where reliability, temperature resilience, and consistent I_C(ON) across variants are critical - distinguishing it from general-purpose phototransistors.

FAQ

What is the guaranteed minimum on-state collector current for MOC70P2 at 5 mA LED drive?

The MOC70P2 guarantees a minimum I_C(ON) of 0.30 mA when driven with 5 mA forward current and measured at V_CE = 10 V. This value is specified in the Optical Switch Selection Guide on page 3 of the DS300009 datasheet and confirms reliable switching behavior even with low-power microcontroller outputs driving the LED.

Does MOC70P2 support operation at 100°C ambient temperature?

Yes, the MOC70P2 is rated for continuous operation from −55°C to +100°C ambient temperature per its Absolute Maximum Ratings table. This makes the MOC70P2 suitable for under-hood automotive modules and industrial PLC I/O cards exposed to high thermal stress without derating beyond the specified linear power dissipation curve.

What is the pin configuration and spacing for MOC70P2?

The MOC70P2 uses a 4-pin DIP-4 package with 0.100" (2.54 mm) lead pitch. Pin 1 is ANODE, Pin 2 is CATHODE, Pin 3 is COLLECTOR, and Pin 4 is EMITTER - as confirmed in the schematic and package drawing on page 1 of the DS300009 datasheet. The body height is 0.270" (6.86 mm).

Can MOC70P2 be used as a direct replacement for MOC70P1 or MOC70P3?

No - MOC70P2 is not a drop-in replacement for MOC70P1 or MOC70P3. While all share identical package and pinout, their I_C(ON) ratings differ: MOC70P1 = 0.15 mA, MOC70P2 = 0.30 mA, MOC70P3 = 0.60 mA (at 5 mA drive). Substituting requires verifying that the target circuit's load and noise margin accommodate the specific gain variant.

What is the maximum forward current rating for the LED in MOC70P2?

The absolute maximum continuous forward current for the MOC70P2 LED is 50 mA, as stated in the Absolute Maximum Ratings table. Exceeding this value risks permanent degradation of the infrared emitter. For reliable 10+ year operation, Fairchild recommends limiting steady-state IF to ≤30 mA with appropriate series resistance.

MOC70P2 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: Slotted, PC Pins

Packaging:: Tube

Product Status:: Obsolete

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:: -55°C ~ 100°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole, Flange

MOC70P2 FAQ

1.How can I place an order for MOC70P2 through Aetrix?

Please submit a Request for Quotation (RFQ) for MOC70P2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MOC70P2 reliable?

The price and inventory of MOC70P2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MOC70P2 is usually 5 days.

3.What payment methods are accepted for MOC70P2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MOC70P2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MOC70P2?

MOC70P2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MOC70P2 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MOC70P2?

For technical support, including MOC70P2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MOC70P2 requirements.

6.How does Aetrix verify that MOC70P2 is sourced from the original manufacturer or authorized distributors?

All MOC70P2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MOC70P2 meets industry standards.

7.What is the process for return or replacement of MOC70P2?

All MOC70P2 units undergo pre-shipment inspection (PSI). If there is an issue with MOC70P2, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MOC70P2 part is unused and in its original packaging.

Return procedure for MOC70P2:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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