4N25S(TB)-V Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N25S(TB)-V is a high-voltage isolation optoisolator manufactured by Everlight Electronics Co Ltd, designed for applications requiring galvanic isolation with 5000Vrms isolation voltage rating. This single-channel transistor output optoisolator with base connection operates in the DC input domain and is packaged in a 6-SMD surface mount configuration.

The 4N25S(TB)-V maintains Active product status with 642 units currently in stock. Substitute parts are identified based on functional equivalence within the 4N25 optoisolator family, accommodating variations in isolation voltage ratings, output voltage specifications, and manufacturer sourcing requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	4N25S(TB)-V
Manufacturer	Everlight Electronics Co Ltd
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	20% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	80V
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	60 mA
Vce Saturation (Max)	500mV
Turn On / Turn Off Time (Typ)	3µs, 3µs
Operating Temperature Range	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the 4N25S(TB)-V are identified from the 4N25 optoisolator family based on the following substitution criteria:

Primary Compatibility Parameters:

Single-channel configuration (Number of Channels = 1)
Transistor output with base connection
DC input type
6-SMD surface mount package with gull wing leads
Vce saturation specification of 500mV
Current transfer ratio minimum of 20% @ 10mA
Operating temperature range overlap with -55°C lower bound

Substitution Logic: Substitute parts are grouped by isolation voltage rating, as this parameter determines the maximum voltage differential the optoisolator can safely isolate. The 4N25S(TB)-V specifies 5000Vrms isolation. Substitute parts with lower isolation ratings (2500Vrms, 4170Vrms, 5300Vrms) represent functional alternatives where the application isolation requirement does not exceed the substitute part's rating. Output voltage maximum and forward current specifications vary among substitutes and must be evaluated against specific circuit requirements.

Parameter Comparison

Parameter	4N25S(TB)-V (Main)	4N25-300E	4N25-500E	4N25S	4N25S-TA1	4N25SM
Manufacturer	Everlight Electronics Co Ltd	Broadcom Limited	Broadcom Limited	onsemi	Lite-On Inc.	onsemi
Number of Channels	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	2500Vrms	2500Vrms	5300Vrms	2500Vrms	4170Vrms
Current Transfer Ratio (Min)	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	80V	30V	30V	30V	30V	30V
Current - Output / Channel	Not specified	100mA	100mA	Not specified	100mA	Not specified
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.2V	1.18V	1.2V	1.18V
Current - DC Forward (If) (Max)	60 mA	80 mA	80 mA	100 mA	80 mA	60 mA
Vce Saturation (Max)	500mV	500mV	500mV	500mV	500mV	500mV
Turn On / Turn Off Time (Typ)	3µs, 3µs	Not specified	Not specified	2µs, 2µs	Not specified	2µs, 2µs
Operating Temperature Range	-55°C ~ 110°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Obsolete	Active	Active

Engineering Selection Recommendations

Active Product Status Substitutes: The 4N25-300E, 4N25-500E, 4N25S-TA1, and 4N25SM maintain Active product status and are suitable for new designs and ongoing production. The 4N25S (onsemi) is marked Obsolete and should not be selected for new applications requiring long-term supply continuity.

Isolation Voltage Considerations: The 4N25S(TB)-V provides 5000Vrms isolation. Substitutes with lower isolation ratings (4N25-300E, 4N25-500E, 4N25S-TA1at 2500Vrms) are suitable only where circuit isolation requirements do not exceed 2500Vrms. The 4N25SM (4170Vrms) and 4N25S (5300Vrms) provide intermediate or equivalent isolation performance.

Output Voltage Limitation: The 4N25S(TB)-V specifies 80V maximum output voltage, while all substitute parts specify 30V maximum output voltage. Applications requiring output voltages above 30V cannot use these substitutes.

Compliance and Certification: All Active substitute parts (4N25-300E, 4N25-500E, 4N25S-TA1, 4N25SM) are ROHS3 Compliant. The 4N25S (onsemi) does not specify RoHS status. All parts carry MSL 1 (Unlimited) moisture sensitivity rating and are classified under ECCN EAR99 and HTSUS 8541.49.8000.

Packaging and Availability: 4N25-300E is supplied in Tube packaging; 4N25-500E in Tape & Reel; 4N25S-TA1 in Cut Tape & Digi-Reel; 4N25SM in Tube. Inventory levels range from 1180 to 10300 units across substitute parts.

Frequently Asked Questions (FAQ)

Q: Can the 4N25-300E or 4N25-500E substitute for the 4N25S(TB)-V in high-voltage isolation applications?

A: No. The 4N25-300E and 4N25-500E specify 2500Vrms isolation voltage, which is 50% lower than the 4N25S(TB)-V 5000Vrms rating. These parts are suitable only for applications where the isolation requirement does not exceed 2500Vrms. Additionally, these parts specify 30V maximum output voltage compared to the 4N25S(TB)-V 80V rating.

Q: What is the difference between 4N25-300E and 4N25-500E?

A: Both parts are manufactured by Broadcom Limited and share identical electrical specifications: 2500Vrms isolation, 30V maximum output voltage, 100mA output current, and -55°C to 100°C operating temperature. The primary difference is packaging: 4N25-300E is supplied in Tube, while 4N25-500E is supplied in Tape & Reel (TR). Inventory availability also differs (1180 units vs. 4020 units).

Q: Is the 4N25S (onsemi) a suitable substitute?

A: The 4N25S provides 5300Vrms isolation voltage, which exceeds the 4N25S(TB)-V 5000Vrms specification, and maintains the same 6-SMD package configuration. However, the 4N25S is marked Obsolete and should not be selected for new designs or applications requiring long-term supply assurance. Active alternatives with equivalent or superior isolation ratings are available.

Q: How does the 4N25SM compare to the main part?

A: The 4N25SM (onsemi) provides 4170Vrms isolation, which is lower than the 4N25S(TB)-V 5000Vrms but higher than the Broadcom 2500Vrms options. The 4N25SM specifies 30V maximum output voltage (vs. 80V for the main part) and 60mA maximum forward current (matching the main part). The 4N25SM is Active status and ROHS3 compliant. It is suitable where isolation requirements fall between 4170Vrms and 5000Vrms and output voltage does not exceed 30V.

Q: What is the significance of the 6-SMD Gull Wing package specification?

A: All substitute parts maintain the same 6-SMD Gull Wing surface mount package as the 4N25S(TB)-V. This ensures mechanical and electrical compatibility with existing PCB layouts and assembly processes. No redesign of footprints or assembly procedures is required when substituting between these parts.

Q: Are all substitute parts ROHS3 compliant?

A: All Active substitute parts (4N25-300E, 4N25-500E, 4N25S-TA1, 4N25SM) are ROHS3 Compliant. The 4N25S (onsemi, Obsolete) does not specify RoHS status in the provided data.

Q: Which substitute offers the highest inventory availability?

A: The 4N25S-TA1 (Lite-On Inc.) offers the highest inventory with 10300 units in stock, followed by 4N25-500E (Broadcom) with 4020 units. The 4N25S(TB)-V main part has 642 units available.

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