6N135 Optoisolator Transistor with Base Output — Equivalent & Substitute Parts

Part Overview

The 6N135 is a 2500Vrms optoisolator with transistor output and base connection in 8-DIP packaging, manufactured by onsemi. This component provides galvanic isolation for DC input signals with a single channel configuration. The 6N135 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across isolation voltage, output type, package form factor, and electrical performance parameters.

Key Parameters

Parameter	Value
Isolation Voltage	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
Voltage - Forward (Vf) (Typ)	1.45V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-55°C ~ 100°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the 6N135 is determined by the following criteria:

Primary Compatibility Requirements:

Package / Case: 8-DIP (0.300", 7.62mm) — mandatory for pin-compatible replacement
Output Type: Transistor with Base — required for circuit interface compatibility
Isolation Voltage: Minimum 2500Vrms — equal or higher isolation rating acceptable
Number of Channels: 1 — single channel configuration
Mounting Type: Through Hole — PCB assembly compatibility

Electrical Performance Criteria:

Current Transfer Ratio (Min/Max): 7% to 50% @ 16mA — defines signal transfer efficiency
Voltage - Output (Max): 20V — output voltage rating
Current - Output / Channel: 8mA — output current capability
Operating Temperature Range: Must encompass or exceed -55°C ~ 100°C for thermal compatibility

Acceptable Substitutes: Parts meeting all primary requirements and electrical performance criteria are classified as direct substitutes. Parts with higher isolation voltage ratings or improved performance characteristics are acceptable upgrades. Parts with reduced operating temperature ranges or lower current transfer ratios require application-level verification.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 16mA	CTR Max @ 16mA	Output Voltage (Max)	Output Current	Operating Temp	Product Status	RoHS Status
6N135	onsemi	2500Vrms	7%	50%	20V	8mA	-55°C ~ 100°C	Obsolete	Not specified
6N135M	onsemi	5000Vrms	7%	50%	20V	8mA	-40°C ~ 100°C	Active	ROHS3 Compliant
6N135	Fairchild Semiconductor	5000Vrms	7%	50%	20V	8mA	-55°C ~ 100°C	Obsolete	RoHS non-compliant
6N135-000E	Broadcom Limited	3750Vrms	7%	50%	20V	8mA	-55°C ~ 100°C	Active	ROHS3 Compliant
HCPL-4562-020E	Broadcom Limited	5000Vrms	Not specified	Not specified	20V	8mA	-40°C ~ 85°C	Active	ROHS3 Compliant
HCPL-4562-060E	Broadcom Limited	3750Vrms	Not specified	Not specified	20V	8mA	-40°C ~ 85°C	Active	ROHS3 Compliant
HCPL-4562-000E	Broadcom Limited	3750Vrms	Not specified	Not specified	20V	8mA	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitute: 6N135M (onsemi)

The 6N135M is the direct onsemi equivalent with active product status. It provides 5000Vrms isolation (double the original specification), maintains identical current transfer ratio performance (7% to 50% @ 16mA), and is ROHS3 compliant. Operating temperature range is -40°C ~ 100°C, which covers the original -55°C minimum with a 15°C reduction at the lower bound. This part is suitable for applications where the lower temperature limit of -40°C is acceptable.

Alternative Substitute: 6N135-000E (Broadcom Limited)

The 6N135-000E provides 3750Vrms isolation with identical electrical performance (7% to 50% CTR @ 16mA) and maintains the full operating temperature range of -55°C ~ 100°C. ROHS3 compliance and active product status support long-term availability. This part is preferred for applications requiring the full -55°C lower temperature specification.

Higher Isolation Option: HCPL-4562-020E (Broadcom Limited)

The HCPL-4562-020E offers 5000Vrms isolation with active status and ROHS3 compliance. Operating temperature range is -40°C ~ 85°C. Current transfer ratio specifications are not provided in the datasheet summary. This part is suitable for applications where higher isolation voltage is required and the reduced upper temperature limit of 85°C is acceptable.

Compliance Consideration:

All recommended active substitutes are ROHS3 compliant. The original 6N135 (Fairchild Semiconductor variant) is RoHS non-compliant and obsolete; this variant should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can the 6N135M replace the original 6N135 in existing designs?

A: Yes, the 6N135M is pin-compatible and maintains identical electrical performance. The primary difference is higher isolation voltage (5000Vrms vs. 2500Vrms) and a reduced lower operating temperature limit (-40°C vs. -55°C). Verify that your application does not require operation below -40°C.

Q: What is the difference between 6N135-000E and HCPL-4562-020E?

A: Both are Broadcom optoisolators with 8-DIP packaging and transistor output. The 6N135-000E provides 3750Vrms isolation with specified current transfer ratio (7% to 50% @ 16mA) and full temperature range (-55°C ~ 100°C). The HCPL-4562-020E provides 5000Vrms isolation with unspecified current transfer ratio and reduced temperature range (-40°C ~ 85°C). Select 6N135-000E if CTR specifications are critical; select HCPL-4562-020E if maximum isolation voltage is required.

Q: Are all substitute parts available in the same packaging?

A: Yes, all listed substitutes use 8-DIP (0.300", 7.62mm) through-hole packaging. Pin compatibility is maintained across all parts listed.

Q: Why is the original 6N135 marked as obsolete?

A: The 6N135 has been superseded by higher-performance variants with improved isolation ratings and compliance certifications. Active alternatives with superior specifications are now the standard in the market.

Q: Can I use HCPL-4562 series parts as direct replacements?

A: HCPL-4562 series parts are functionally equivalent with identical package and output type. However, current transfer ratio specifications are not provided for these variants. Confirm CTR performance requirements with the component datasheet before substitution in applications where signal transfer efficiency is critical.

Q: What is the impact of operating temperature range differences?

A: The original 6N135 operates from -55°C to 100°C. The 6N135M operates from -40°C to 100°C (15°C reduction at lower limit). HCPL-4562 variants operate from -40°C to 85°C (15°C reduction at lower limit, 15°C reduction at upper limit). Verify your application's thermal requirements before selecting a substitute with a narrower temperature range.

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