6N135SD Optoisolator Equivalent & Substitute Parts

Part Overview

The 6N135SD is an optoisolator transistor with base output manufactured by onsemi, rated for 2500Vrms isolation voltage in an 8-SMD surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The 6N135SD provides galvanic isolation with a single channel transistor output configuration suitable for DC input applications requiring isolation in industrial and power management circuits.

Key Parameters

Parameter	Value
Manufacturer Part Number	6N135SD
Manufacturer	onsemi
Product Status	Obsolete
Voltage - Isolation	2500Vrms
Number of Channels	1
Output Type	Transistor with Base
Current Transfer Ratio (Min)	7% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Operating Temperature	-55°C ~ 100°C
Package / Case	8-SMD, Gull Wing
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 6N135SD is determined by the following critical parameters:

Voltage - Isolation: Minimum 2500Vrms required; higher ratings are acceptable
Output Type: Must be Transistor with Base configuration
Number of Channels: Single channel only
Current Transfer Ratio: Range 7% to 50% @ 16mA acceptable
Package / Case: 8-SMD, Gull Wing form factor
Mounting Type: Surface Mount
Input Type: DC
Voltage - Output (Max): 20V
Current - Output / Channel: 8mA

Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes (onsemi): Parts maintaining the same base product line with enhanced specifications.

Cross-Manufacturer Alternatives (Broadcom Limited): Parts from alternative manufacturers meeting or exceeding isolation voltage and electrical performance requirements while maintaining package compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Isolation	Output Type	CTR Min @ 16mA	CTR Max @ 16mA	Voltage - Output (Max)	Current - Output	Operating Temp	Product Status	Package
6N135SD	onsemi	2500Vrms	Transistor with Base	7%	50%	20V	8mA	-55°C ~ 100°C	Obsolete	8-SMD, Gull Wing
6N135SDM	onsemi	5000Vrms	Transistor with Base	7%	50%	20V	8mA	-40°C ~ 100°C	Active	8-SMD, Gull Wing
6N135-300E	Broadcom Limited	3750Vrms	Transistor with Base	7%	50%	20V	8mA	-55°C ~ 100°C	Active	8-SMD, Gull Wing
6N135-500E	Broadcom Limited	3750Vrms	Transistor with Base	7%	50%	20V	8mA	-55°C ~ 100°C	Active	8-SMD, Gull Wing
HCPL-4504#300	Broadcom Limited	3750Vrms	Transistor	25%	60%	20V	8mA	-55°C ~ 100°C	Active	8-SMD, Gull Wing
HCPL-4562-300E	Broadcom Limited	3750Vrms	Transistor with Base	—	—	20V	8mA	-40°C ~ 85°C	Active	8-SMD, Gull Wing
HCPL-4562-500E	Broadcom Limited	3750Vrms	Transistor with Base	—	—	20V	8mA	-40°C ~ 85°C	Active	8-SMD, Gull Wing
HCPL-4562-520E	Broadcom Limited	5000Vrms	Transistor with Base	—	—	20V	8mA	-40°C ~ 85°C	Active	8-SMD, Gull Wing
HCPL-J454-400E	Broadcom Limited	3750Vrms	Transistor	19%	60%	20V	8mA	-55°C ~ 100°C	Active	8-SMD, Gull Wing
HCPL-J454-600E	Broadcom Limited	3750Vrms	Transistor	19%	60%	20V	8mA	-55°C ~ 100°C	Active	8-SMD, Gull Wing

Engineering Selection Recommendations

Primary Recommendation: 6N135SDM

The 6N135SDM is the direct successor from onsemi, offering enhanced 5000Vrms isolation voltage while maintaining identical electrical performance and package compatibility. Active product status ensures long-term availability and supply chain stability. Operating temperature range of -40°C to 100°C covers most industrial applications; applications requiring -55°C operation require alternative selection.

Secondary Recommendation: 6N135-300E or 6N135-500E

Broadcom Limited 6N135-300E and 6N135-500E provide 3750Vrms isolation with identical current transfer ratio specifications and full -55°C to 100°C operating range. Both are active products with RoHS3 compliance. Selection between -300E (Tube packaging) and -500E (Tape & Reel packaging) depends on procurement and assembly requirements.

Alternative for Higher Isolation: HCPL-4562-520E

The HCPL-4562-520E provides 5000Vrms isolation matching the 6N135SDM specification. Operating temperature range is -40°C to 85°C. RoHS3 compliance and active status support modern design requirements. Current transfer ratio specifications are not provided in available documentation.

Note on HCPL-4504#300 and HCPL-J454 Series

These parts lack base output configuration (transistor output only), making them incompatible with designs requiring base drive capability. Selection of these alternatives requires circuit redesign and is not recommended for direct substitution of the 6N135SD.

Frequently Asked Questions (FAQ)

Q: Can the 6N135SDM directly replace the 6N135SD?

A: Yes. The 6N135SDM maintains identical electrical performance (7% to 50% current transfer ratio), package configuration (8-SMD Gull Wing), and output type (Transistor with Base). The enhanced 5000Vrms isolation rating provides additional design margin. Operating temperature minimum of -40°C (versus -55°C) must be verified against application requirements.

Q: What is the difference between 6N135-300E and 6N135-500E?

A: Both parts are electrically identical with 3750Vrms isolation and identical current transfer ratio specifications. The primary difference is packaging: 6N135-300E is supplied in Tube format, while 6N135-500E is supplied in Tape & Reel format. Selection depends on procurement volume and assembly line requirements.

Q: Why are HCPL-4504#300 and HCPL-J454 series listed as substitutes if they lack base output?

A: These parts are listed in the original substitute reference but are not recommended for direct substitution due to output type mismatch (Transistor versus Transistor with Base). Circuits designed for base drive capability cannot use these alternatives without modification.

Q: Is the 6N135SD still available for purchase?

A: The 6N135SD is classified as obsolete. Active alternatives such as 6N135SDM, 6N135-300E, 6N135-500E, and HCPL-4562-520E are recommended for new designs and ongoing production.

Q: What are the RoHS compliance differences between substitutes?

A: The 6N135SDM, 6N135-300E, 6N135-500E, HCPL-4562-300E, HCPL-4562-500E, HCPL-4562-520E, HCPL-J454-400E, and HCPL-J454-600E are RoHS3 compliant. The HCPL-4504#300 is RoHS non-compliant. Application requirements for RoHS compliance must be verified before part selection.

Q: Can I use a substitute with higher isolation voltage than the 6N135SD?

A: Yes. Higher isolation voltage ratings (3750Vrms, 5000Vrms) provide additional design margin and are functionally compatible. Circuit design must account for any differences in switching speed or current transfer ratio specifications.

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