6N135W Optoisolator Equivalent & Substitute Parts

Part Overview

The 6N135W is an optoisolator transistor with base output manufactured by onsemi, rated for 2500Vrms isolation voltage in a single-channel 8-DIP package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The 6N135W provides DC input with transistor output including base access, suitable for applications requiring galvanic isolation with moderate voltage ratings and 8mA output current capability.

Key Parameters

Parameter	Value
Manufacturer Part Number	6N135W
Manufacturer	onsemi
Category	Optoisolators
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	2500Vrms
Current Transfer Ratio (Min)	7% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Turn On / Turn Off Time (Typ)	450ns, 500ns
Input Type	DC
Output Type	Transistor with Base
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.45V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.400", 10.16mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the 6N135W is determined by the following critical parameters:

Isolation Voltage: Substitute parts must maintain minimum 2500Vrms isolation or higher
Output Type: Must be transistor with base output for circuit compatibility
Number of Channels: Single channel requirement
Input Type: DC input compatibility
Output Current: 8mA per channel minimum
Mounting Type: Through hole configuration
Package Style: 8-DIP format

The substitute parts listed (HCPL-4562, HCPL-4562-000E, HCPL-4562-020E, HCPL-4562-060E) all meet these core requirements. Broadcom Limited HCPL-4562 series components provide higher isolation voltage ratings (3750Vrms to 5000Vrms) with active product status, making them suitable replacements for the obsolete 6N135W in new designs.

Parameter Comparison

Parameter	6N135W	HCPL-4562	HCPL-4562-000E	HCPL-4562-020E	HCPL-4562-060E
Manufacturer	onsemi	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Product Status	Obsolete	Active	Active	Active	Active
Number of Channels	1	1	1	1	1
Voltage - Isolation	2500Vrms	3750Vrms	3750Vrms	5000Vrms	3750Vrms
Input Type	DC	DC	DC	DC	DC
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	20V	20V	20V	20V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.45V	1.3V	1.3V	1.3V	1.3V
Current - DC Forward (If) (Max)	25mA	12mA	12mA	12mA	12mA
Operating Temperature	-55°C ~ 100°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	8-DIP (0.400", 10.16mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All listed HCPL-4562 variants are active products with ROHS3 compliance, providing regulatory advantages over the obsolete 6N135W. The HCPL-4562-020E offers the highest isolation voltage rating at 5000Vrms, suitable for applications requiring enhanced isolation margins. HCPL-4562 and HCPL-4562-000E/060E variants provide 3750Vrms isolation, exceeding the 6N135W minimum requirement while maintaining active product status and long-term availability.

Package dimensions differ between the 6N135W (0.400" width) and HCPL-4562 series (0.300" width), requiring PCB layout verification during substitution. Forward voltage is lower in HCPL-4562 variants (1.3V vs 1.45V), and maximum forward current is reduced (12mA vs 25mA), necessitating input circuit review for LED drive compatibility.

Operating temperature range narrows from -55°C to -40°C minimum in HCPL-4562 series; applications requiring extended low-temperature operation below -40°C must retain the 6N135W or identify alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4562 series parts directly replace 6N135W without circuit modification?

A: Functional substitution is possible due to matching output type (transistor with base), single-channel configuration, and compatible isolation voltage. However, input LED drive circuits require adjustment due to lower forward voltage (1.3V vs 1.45V) and reduced maximum forward current (12mA vs 25mA). PCB layout changes are necessary due to different package widths (0.300" vs 0.400").

Q: Which HCPL-4562 variant should be selected for maximum design margin?

A: HCPL-4562-020E provides the highest isolation voltage at 5000Vrms, offering the greatest margin above the 6N135W baseline of 2500Vrms. Selection depends on application isolation requirements and cost considerations.

Q: Are there temperature range limitations when substituting with HCPL-4562 series?

A: Yes. HCPL-4562 variants operate from -40°C to 85°C, compared to 6N135W range of -55°C to 100°C. Applications requiring operation below -40°C or above 85°C cannot use these substitutes.

Q: What is the significance of package dimension differences?

A: The 6N135W uses 8-DIP (0.400", 10.16mm) while HCPL-4562 series uses 8-DIP (0.300", 7.62mm). Both are through-hole 8-pin DIP packages with identical pinout compatibility, but PCB footprints differ. Existing PCB designs require layout modification or use of adapter carriers.

Q: Do HCPL-4562 variants have compliance advantages?

A: All HCPL-4562 variants are ROHS3 compliant and active products, providing regulatory compliance and long-term supply assurance compared to the obsolete 6N135W status.

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