MOC223VM Optoisolator Equivalent & Substitute Parts

Part Overview

The MOC223VM is an optoisolator with Darlington output and base connection, rated for 2500Vrms isolation voltage. Manufactured by onsemi, this component features a single channel configuration in 8-SOIC surface mount packaging. The MOC223VM is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across isolation voltage, output type, channel configuration, and package format.

Key Parameters

Parameter	MOC223VM Value
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	2500Vrms
Current Transfer Ratio (Min)	500% @ 1mA
Output Type	Darlington with Base
Voltage - Output (Max)	30V
Current - Output / Channel	150mA
Vce Saturation (Max)	1V
Operating Temperature	-40°C ~ 100°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the MOC223VM are selected based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Single channel configuration (Number of Channels = 1)
Darlington output with base connection (Output Type)
8-SOIC surface mount package (Package / Case)
DC input type
Maximum output voltage of 30V
Vce saturation maximum of 1V

Isolation Voltage Consideration: The MOC223VM operates at 2500Vrms isolation. Substitute parts with higher isolation ratings (4000Vrms) provide enhanced isolation capability and are functionally compatible for applications requiring 2500Vrms or less.

Current Transfer Ratio Grouping: Substitute parts are available with Current Transfer Ratio (Min) values of 100%, 200%, and 500% @ 1mA. The MOC223VM specifies 500% minimum, matching IL223AT and VO223AT exactly. Parts with lower CTR values (IL221AT, IL222AT, VO221AT, VO222AT) represent reduced-performance alternatives suitable only when lower current transfer is acceptable.

Output Current Capability: The MOC223VM supports 150mA output current. Substitute parts IL221AT, IL222AT, and IL223AT do not specify output current, while VO221AT, VO222AT, and VO223AT are rated for 50mA maximum output current. This represents a functional limitation for VO-series parts in high-current applications.

Parameter Comparison

Parameter	MOC223VM	IL221AT	IL222AT	IL223AT	VO221AT	VO222AT	VO223AT
Manufacturer	onsemi	Vishay	Vishay	Vishay	Vishay	Vishay	Vishay
Voltage - Isolation	2500Vrms	4000Vrms	4000Vrms	4000Vrms	4000Vrms	4000Vrms	4000Vrms
Current Transfer Ratio (Min)	500% @ 1mA	100% @ 1mA	200% @ 1mA	500% @ 1mA	100% @ 1mA	200% @ 1mA	500% @ 1mA
Turn On / Turn Off Time (Typ)	10µs, 125µs	—	—	—	3µs, 3µs	3µs, 3µs	3µs, 3µs
Output Type	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base
Voltage - Output (Max)	30V	30V	30V	30V	30V	30V	30V
Current - Output / Channel	150mA	—	—	—	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.08V	1V	1V	1V	1V	1V	1V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	1V	1V	1V	1V	1V	1V	1V
Operating Temperature	-40°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: IL223AT

IL223AT is the closest functional equivalent to MOC223VM. It maintains the 500% minimum current transfer ratio, identical output voltage and saturation specifications, and 8-SOIC package format. IL223AT is active in production with ROHS3 compliance and higher isolation rating (4000Vrms). Extended operating temperature range (-55°C to 100°C) provides broader environmental coverage compared to MOC223VM.

Secondary Substitutes by Current Transfer Ratio:

IL222AT (200% CTR) and IL221AT (100% CTR) provide lower current transfer performance. These are suitable only when reduced CTR is acceptable for the application. IL222AT and IL221AT maintain identical package, output voltage, and saturation characteristics.

Alternative with Faster Switching: VO223AT

VO223AT matches the 500% current transfer ratio and maintains all core electrical specifications. Turn-on and turn-off times are significantly faster (3µs vs. 10µs and 125µs). However, output current is limited to 50mA compared to MOC223VM's 150mA. VO223AT is appropriate for applications requiring faster switching with lower output current demands.

Lower Performance Alternatives: VO221AT and VO222AT

VO221AT (100% CTR) and VO222AT (200% CTR) offer faster switching characteristics but reduced current transfer and output current capability (50mA maximum). These are suitable only when both reduced CTR and lower output current are acceptable.

Compliance and Availability:

All substitute parts are active in production status with ROHS3 compliance. IL-series parts (IL221AT, IL222AT, IL223AT) do not specify output current in available data. VO-series parts (VO221AT, VO222AT, VO223AT) explicitly limit output current to 50mA, representing a functional constraint for high-current applications.

Frequently Asked Questions (FAQ)

Q: Can IL223AT directly replace MOC223VM in all applications?

A: IL223AT is functionally compatible for applications requiring 2500Vrms isolation or less. The higher 4000Vrms isolation rating provides enhanced capability. However, verify that the extended temperature range (-55°C to 100°C) and any timing differences are acceptable for your specific application. Pinout compatibility in 8-SOIC package is maintained.

Q: What is the significance of Current Transfer Ratio (CTR) values?

A: CTR determines the ratio of output current to input current. MOC223VM specifies 500% minimum CTR @ 1mA. IL223AT and VO223AT match this specification. IL221AT and VO221AT provide only 100% CTR, while IL222AT and VO222AT provide 200% CTR. Lower CTR values require higher input current to achieve equivalent output current.

Q: Why do VO-series parts show 50mA output current while MOC223VM supports 150mA?

A: Output current capability is a specified electrical limit. VO221AT, VO222AT, and VO223AT are rated for maximum 50mA output current per channel. MOC223VM supports 150mA. Applications requiring output currents above 50mA must use IL-series substitutes or MOC223VM if available. VO-series parts are suitable only for lower-current applications.

Q: Are IL-series parts suitable substitutes if output current is not specified?

A: IL221AT, IL222AT, and IL223AT do not provide explicit output current specifications in available data. This does not indicate incompatibility; rather, the specification may not be published. For applications requiring confirmed output current capability above 50mA, contact the manufacturer or use VO-series parts only if their 50mA limit is acceptable.

Q: What is the impact of faster switching times in VO-series parts?

A: VO-series parts (VO221AT, VO222AT, VO223AT) feature turn-on and turn-off times of 3µs compared to MOC223VM's 10µs and 125µs. Faster switching reduces propagation delay and may improve system response time. However, this benefit applies only if the application circuit is designed to accommodate faster switching characteristics. Verify that faster switching does not introduce noise or timing conflicts in your circuit.

Q: Is the 8-SOIC package identical across all substitute parts?

A: All parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging. Pinout compatibility is maintained across MOC223VM, IL-series, and VO-series parts. PCB layout and footprint are interchangeable.

Q: What compliance certifications apply to substitute parts?

A: IL221AT, IL222AT, IL223AT, VO221AT, VO222AT, and VO223AT are all ROHS3 compliant. All parts carry ECCN EAR99 and HTSUS 8541.49.8000 classifications. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special moisture handling requirements.

Q: Can I use a substitute part with higher isolation voltage (4000Vrms) in place of MOC223VM (2500Vrms)?

A: Yes. Higher isolation voltage rating provides enhanced isolation capability and is functionally compatible for applications requiring 2500Vrms or less. No circuit modifications are required. The higher rating represents improved performance margin.

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