VOD211T Optoisolator Equivalent & Substitute Parts

Part Overview

The VOD211T is a 2-channel optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This component provides 4000Vrms isolation voltage and is designed for applications requiring galvanic isolation between input and output circuits. The part is currently active in production with 12,320 units in stock. Substitute parts are necessary when addressing supply constraints, specific performance requirements, or design optimization needs within compatible electrical and mechanical parameters.

Key Parameters

Parameter	VOD211T
Manufacturer	Vishay Semiconductor Opto Division
Number of Channels	2
Voltage - Isolation	4000Vrms
Current Transfer Ratio (Min)	20% @ 10mA
Turn On / Turn Off Time (Typ)	5µs, 4µs
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-40°C ~ 100°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the VOD211T are qualified based on the following criteria:

Electrical Compatibility Parameters:

Number of channels: 2 (required match)
Output type: Transistor (required match)
Voltage - Output (Max): Must be ≥70V
Current - Output / Channel: Must be ≥50mA
Vce Saturation (Max): Must be ≤400mV
Input Type: DC (required match)

Mechanical Compatibility Parameters:

Mounting Type: Surface Mount (required match)
Package / Case: 8-SOIC or 8-SO (compatible footprints)

Compliance Parameters:

RoHS Status: ROHS3 Compliant (required match)
Moisture Sensitivity Level: 1 (Unlimited) (required match)

All five substitute parts (ACPL-227-500E, ACPL-227-50CE, ACPL-227-560E, ACPL-227-50BE, ACPL-227-56BE) meet these criteria. The primary difference is isolation voltage: substitute parts provide 3000Vrms isolation, which is lower than the VOD211T's 4000Vrms. This reduction is acceptable in applications where 3000Vrms isolation meets system requirements.

Parameter Comparison

Parameter	VOD211T	ACPL-227-500E	ACPL-227-50BE	ACPL-227-50CE	ACPL-227-560E	ACPL-227-56BE
Manufacturer	Vishay	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom
Number of Channels	2	2	2	2	2	2
Voltage - Isolation	4000Vrms	3000Vrms	3000Vrms	3000Vrms	3000Vrms	3000Vrms
Current Transfer Ratio (Min)	20% @ 10mA	50% @ 5mA	130% @ 5mA	200% @ 5mA	50% @ 5mA	130% @ 5mA
Turn On / Turn Off Time (Typ)	5µs, 4µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	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
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.173", 4.40mm)	8-SOIC (0.173", 4.40mm)	8-SOIC (0.173", 4.40mm)	8-SOIC (0.173", 4.40mm)	8-SOIC (0.173", 4.40mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts are active products with ROHS3 compliance and MSL 1 rating, meeting regulatory and environmental requirements equivalent to the VOD211T.

ACPL-227-50CE offers the highest current transfer ratio (200% minimum @ 5mA) and fastest switching response (3µs turn-on, 3µs turn-off), providing improved noise margin and reduced propagation delay compared to the VOD211T.

ACPL-227-50BE and ACPL-227-56BE provide 130% minimum current transfer ratio with identical switching characteristics to ACPL-227-50CE, offering moderate performance improvement over the VOD211T.

ACPL-227-500E and ACPL-227-560E provide 50% minimum current transfer ratio, representing the lowest performance tier among substitutes but still exceeding the VOD211T's 20% specification.

All substitute parts support extended operating temperature range (-55°C to 110°C) compared to the VOD211T (-40°C to 100°C) and higher maximum output voltage (80V versus 70V). The primary trade-off is reduced isolation voltage (3000Vrms versus 4000Vrms).

Frequently Asked Questions (FAQ)

Q: Can ACPL-227 series parts directly replace VOD211T in existing PCB layouts?

A: Package footprints differ slightly. VOD211T uses 8-SOIC with 0.154" (3.90mm) width, while ACPL-227 parts use 8-SOIC with 0.173" (4.40mm) width. Both are 8-pin SOIC packages with compatible pin assignments, but PCB layout verification is required to confirm pad spacing compatibility.

Q: What is the impact of reduced isolation voltage from 4000Vrms to 3000Vrms?

A: Isolation voltage reduction affects maximum allowable voltage differential between input and output circuits. Applications requiring 4000Vrms isolation must retain the VOD211T. Applications with system isolation requirements of 3000Vrms or lower can use ACPL-227 substitutes.

Q: Which substitute part offers the best performance improvement?

A: ACPL-227-50CE provides the highest current transfer ratio (200% minimum) and fastest switching times (3µs on/off), delivering improved signal integrity and reduced propagation delay relative to the VOD211T's 20% transfer ratio and 5µs/4µs switching times.

Q: Are all substitute parts available in equivalent packaging options?

A: ACPL-227-500E, ACPL-227-50CE, and ACPL-227-560E are available in Cut Tape (CT) & Digi-Reel® packaging. ACPL-227-50BE and ACPL-227-56BE are available in Tape & Reel (TR) packaging, matching the VOD211T's TR packaging option.

Q: Do substitute parts meet the same compliance standards?

A: All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the VOD211T's compliance profile. ACPL-227 parts additionally carry REACH Unaffected status.

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