MOCD208VM Equivalent & Substitute Parts

Part Overview

The MOCD208VM is a 2-channel optoisolator with transistor output manufactured by onsemi, rated for 2500Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MOCD208VM operates with a current transfer ratio of 40% to 125% at 10mA input and supports output currents up to 150mA per channel in an 8-SOIC surface mount package.

Key Parameters

Parameter	MOCD208VM
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	2
Voltage - Isolation	2500Vrms
Current Transfer Ratio (Min)	40% @ 10mA
Current Transfer Ratio (Max)	125% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	150mA
Vce Saturation (Max)	400mV
Operating Temperature	-40°C ~ 100°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MOCD208VM is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Number of Channels: 2 (all substitutes must maintain dual-channel configuration)
Output Type: Transistor (all substitutes must use transistor output topology)
Mounting Type: Surface Mount (all substitutes must be surface mount)
Package / Case: 8-SOIC form factor (all substitutes must use 8-SOIC or compatible 8-SO package)
Input Type: DC (all substitutes must accept DC input)
Vce Saturation (Max): 400mV (all substitutes must meet or exceed this specification)

Substitution Allowances:

Voltage - Isolation: Substitutes may exceed 2500Vrms (higher isolation voltage is acceptable)
Current Transfer Ratio: Substitutes may vary within their specified ranges
Current - Output / Channel: Substitutes may differ from 150mA (application-dependent)
Operating Temperature: Substitutes may have wider or different temperature ranges
Turn On / Turn Off Time: Substitutes may have different switching characteristics
Rise / Fall Time: Substitutes may have different slew rate characteristics

Substitute parts are grouped into two categories: Broadcom ACPL-227 series (3000Vrms isolation) and Vishay ILD series (4000Vrms isolation). Both groups meet the mandatory compatibility criteria while offering enhanced isolation voltage ratings and active product status.

Parameter Comparison

Parameter	MOCD208VM	ACPL-227-500E	ACPL-227-50BE	ACPL-227-50CE	ACPL-227-560E	ACPL-227-56BE	ACPL-227-56CE	ILD205T	ILD206T	ILD211T	ILD213T
Manufacturer	onsemi	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Vishay	Vishay	Vishay	Vishay
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Number of Channels	2	2	2	2	2	2	2	2	2	2	2
Voltage - Isolation	2500Vrms	3000Vrms	3000Vrms	3000Vrms	3000Vrms	3000Vrms	3000Vrms	4000Vrms	4000Vrms	4000Vrms	4000Vrms
Current Transfer Ratio (Min)	40% @ 10mA	50% @ 5mA	130% @ 5mA	200% @ 5mA	50% @ 5mA	130% @ 5mA	200% @ 5mA	40% @ 10mA	63% @ 10mA	20% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	125% @ 10mA	600% @ 5mA	260% @ 5mA	400% @ 5mA	600% @ 5mA	260% @ 5mA	400% @ 5mA	80% @ 10mA	125% @ 10mA	—	—
Turn On / Turn Off Time (Typ)	7.5µs, 5.7µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	6µs, 5µs	6µs, 5µs	6µs, 5µs	6µs, 5µs
Rise / Fall Time (Typ)	3.2µs, 4.7µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	3µs, 4.7µs	3µs, 4.7µs	3µs, 4.7µs	3µs, 4.7µs
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	80V	80V	80V	80V	80V	80V	70V	70V	70V	70V
Current - Output / Channel	150mA	50mA	50mA	50mA	50mA	50mA	50mA	—	—	—	—
Voltage - Forward (Vf) (Typ)	1.25V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	50mA	50mA	50mA	50mA	50mA	50mA	30mA	30mA	30mA	30mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-40°C ~ 100°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.173", 4.40mm Width)	8-SOIC (0.173", 4.40mm Width)	8-SOIC (0.173", 4.40mm Width)	8-SOIC (0.173", 4.40mm Width)	8-SOIC (0.173", 4.40mm Width)	8-SOIC (0.173", 4.40mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, providing regulatory continuity for new designs. The Broadcom ACPL-227 series offers 3000Vrms isolation with faster switching characteristics (3µs turn-on/off versus 7.5µs/5.7µs for the MOCD208VM) and is available in high inventory quantities. The Vishay ILD series provides 4000Vrms isolation with switching performance comparable to the MOCD208VM and maintains the original 0.154" package width.

Selection between Broadcom and Vishay substitutes depends on isolation voltage requirements and output current capacity. Broadcom ACPL-227 variants support only 50mA per channel output current, requiring circuit redesign if the original 150mA per channel is critical. Vishay ILD parts do not specify per-channel output current but maintain the 70V maximum output voltage rating of the MOCD208VM.

Within the Broadcom ACPL-227 family, variants differ by current transfer ratio: ACPL-227-500E and ACPL-227-560E offer 50% minimum CTR, ACPL-227-50BE and ACPL-227-56BE offer 130% minimum CTR, and ACPL-227-50CE and ACPL-227-56CE offer 200% minimum CTR. Selection should align with input current drive capability and output load requirements.

Within the Vishay ILD series, ILD205T and ILD206T offer 40% and 63% minimum CTR respectively, while ILD211T and ILD213T offer 20% and 100% minimum CTR respectively. All Vishay variants maintain compatibility with the MOCD208VM's 70V output voltage and 400mV saturation voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can ACPL-227 series parts directly replace MOCD208VM in existing designs?

A: ACPL-227 parts are pin-compatible and functionally equivalent for 2-channel optoisolator applications. However, the reduced output current rating (50mA per channel versus 150mA) requires circuit evaluation. If the original design draws more than 50mA per channel, output stage redesign is necessary. The faster switching times (3µs versus 7.5µs turn-on) may also require timing verification in critical applications.

Q: What is the difference between ACPL-227-500E, ACPL-227-50BE, and ACPL-227-50CE?

A: These parts differ only in current transfer ratio specifications. ACPL-227-500E and ACPL-227-560E specify 50% minimum CTR at 5mA input. ACPL-227-50BE and ACPL-227-56BE specify 130% minimum CTR at 5mA input. ACPL-227-50CE and ACPL-227-56CE specify 200% minimum CTR at 5mA input. Selection depends on input current drive capability and required output current gain.

Q: Are Vishay ILD parts compatible with MOCD208VM?

A: Vishay ILD205T, ILD206T, ILD211T, and ILD213T are functionally compatible substitutes. All maintain 2-channel transistor output configuration, 8-SOIC package form factor, and 70V maximum output voltage. The higher 4000Vrms isolation rating provides additional margin. Current transfer ratio varies by part number, requiring selection based on input drive and output requirements.

Q: Does package width difference between 0.154" and 0.173" affect PCB layout?

A: The ACPL-227 series uses 0.173" package width versus 0.154" for the MOCD208VM and Vishay ILD series. This 0.019" difference may require PCB footprint adjustment. Verify PCB layout spacing and trace routing before substitution. Vishay ILD parts maintain the original 0.154" width and require no layout modification.

Q: What is the impact of higher isolation voltage ratings?

A: Broadcom ACPL-227 (3000Vrms) and Vishay ILD (4000Vrms) parts provide higher isolation voltage than the MOCD208VM (2500Vrms). Higher isolation voltage is always acceptable and provides additional safety margin. No circuit modification is required; the higher rating is a direct upgrade.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The MOCD208VM does not specify RoHS status. For new designs subject to RoHS requirements, Broadcom ACPL-227 and Vishay ILD series parts satisfy regulatory compliance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message