HCPL-4701#320 Equivalent & Substitute Parts

Part Overview

The HCPL-4701#320 is a 5000Vrms optoisolator with Darlington output and base connection, configured as a single-channel 8-DIP Gull Wing surface mount device. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain isolation voltage, output current capability, and Darlington configuration while accommodating packaging and performance variations across manufacturers.

Key Parameters

Parameter	HCPL-4701#320
Manufacturer	Broadcom Limited
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	600% @ 500µA
Current Transfer Ratio (Max)	8000% @ 500µA
Output Type	Darlington with Base
Voltage - Output (Max)	18V
Current - Output / Channel	60mA
Input Type	DC
Operating Temperature	0°C ~ 70°C
Package / Case	8-SMD, Gull Wing
RoHS Status	RoHS non-compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

Single channel configuration (1 channel)
Isolation voltage rating of 5000Vrms or higher
Darlington output with base connection
8-SMD Gull Wing package
60mA output current capability
DC input type

Substitute parts are grouped into two categories based on isolation voltage and performance characteristics:

Category A: 5000Vrms Isolation (Direct Voltage Match)

HCPL-4701-320E (Broadcom Limited, Active)
6N138S1(TA), 6N138S1(TA)-V, 6N138S1(TB), 6N138S1(TB)-V (Everlight Electronics)
6N138SMT/R (Isocom Components)
6N139S1(TA) (Everlight Electronics)

Category B: 5300Vrms Isolation (Enhanced Voltage Rating)

6N139-X009, 6N139-X009T, 6N139-X017T (Vishay Semiconductor Opto Division)

All substitute parts maintain the required 60mA output current, Darlington with base output configuration, and 8-SMD Gull Wing package format.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ Test Condition	Output Voltage (Max)	Output Current	Operating Temp	RoHS Status	Product Status
HCPL-4701#320	Broadcom Limited	5000Vrms	600% @ 500µA	18V	60mA	0°C ~ 70°C	Non-compliant	Discontinued
HCPL-4701-320E	Broadcom Limited	5000Vrms	600% @ 500µA	18V	60mA	0°C ~ 70°C	ROHS3 Compliant	Active
6N138S1(TA)	Everlight Electronics	5000Vrms	300% @ 1.6mA	7V	60mA	-40°C ~ 85°C	ROHS3 Compliant	Active
6N138S1(TA)-V	Everlight Electronics	5000Vrms	300% @ 1.6mA	7V	60mA	-40°C ~ 85°C	ROHS3 Compliant	Active
6N138S1(TB)	Everlight Electronics	5000Vrms	300% @ 1.6mA	7V	60mA	-40°C ~ 85°C	ROHS3 Compliant	Active
6N138S1(TB)-V	Everlight Electronics	5000Vrms	300% @ 1.6mA	7V	60mA	-40°C ~ 85°C	ROHS3 Compliant	Active
6N138SMT/R	Isocom Components	5000Vrms	300% @ 1.6mA	7V	60mA	0°C ~ 70°C	ROHS3 Compliant	Active
6N139S1(TA)	Everlight Electronics	5000Vrms	500% @ 1.6mA	18V	60mA	-40°C ~ 85°C	ROHS3 Compliant	Active
6N139-X009	Vishay Semiconductor Opto Division	5300Vrms	500% @ 1.6mA	18V	60mA	-55°C ~ 100°C	ROHS3 Compliant	Active
6N139-X009T	Vishay Semiconductor Opto Division	5300Vrms	500% @ 1.6mA	18V	60mA	-55°C ~ 100°C	ROHS3 Compliant	Active
6N139-X017T	Vishay Semiconductor Opto Division	5300Vrms	500% @ 1.6mA	18V	60mA	-55°C ~ 100°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Recommendation: HCPL-4701-320E

The HCPL-4701-320E from Broadcom Limited is the direct functional equivalent of the discontinued HCPL-4701#320. It maintains identical electrical specifications including 5000Vrms isolation, 600% minimum CTR at 500µA, 18V maximum output voltage, and 60mA output current. The primary distinction is RoHS3 compliance status and active product availability. This part is suitable for applications requiring exact parameter matching and Broadcom component continuity.

Secondary Recommendation: 6N139S1(TA)

The 6N139S1(TA) from Everlight Electronics provides 5000Vrms isolation with 500% CTR at 1.6mA test condition and 18V maximum output voltage, matching the original part's output voltage capability. This part offers extended operating temperature range (-40°C to 85°C) and RoHS3 compliance. Selection is appropriate when temperature performance beyond the original 0°C to 70°C range is required.

Alternative for Enhanced Isolation: 6N139-X009, 6N139-X009T, 6N139-X017T

The Vishay 6N139 series provides 5300Vrms isolation voltage, exceeding the original 5000Vrms specification. These parts maintain 18V output voltage and 60mA current capability with 500% CTR at 1.6mA. Extended operating temperature range (-55°C to 100°C) and RoHS3 compliance are provided. Selection is appropriate for applications requiring higher isolation margin or extended temperature operation.

Alternative for Cost Optimization: 6N138 Series

The Everlight 6N138S1 variants and Isocom 6N138SMT/R provide 5000Vrms isolation with 300% CTR at 1.6mA. Maximum output voltage is limited to 7V compared to the original 18V specification. These parts are suitable only for applications where output voltage does not exceed 7V and lower CTR is acceptable.

All recommended substitutes maintain single-channel configuration, Darlington with base output, 8-SMD Gull Wing package, 60mA output current, and DC input type as required for functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can the HCPL-4701-320E be used as a direct replacement for HCPL-4701#320?

A: Yes. The HCPL-4701-320E maintains identical electrical specifications including isolation voltage, current transfer ratio range, output voltage, and output current. The primary difference is RoHS3 compliance and active product status. Packaging is 8-DIP Gull Wing surface mount in both cases.

Q: What is the difference between 5000Vrms and 5300Vrms isolation ratings?

A: The 5300Vrms rating provides higher isolation margin. Both ratings exceed 5000Vrms minimum requirement. Selection of 5300Vrms parts is appropriate when additional isolation safety margin is required by system design or regulatory requirements.

Q: Why do some substitute parts have lower maximum output voltage (7V vs 18V)?

A: The 6N138 series is rated for 7V maximum output voltage while the original HCPL-4701#320 and 6N139 series are rated for 18V. Substitution with 6N138 parts is valid only if circuit design does not require output voltage exceeding 7V. Verify output voltage requirements before selecting 6N138 alternatives.

Q: What does Current Transfer Ratio (CTR) represent and why does it vary between parts?

A: CTR is the ratio of output current to input current, expressed as a percentage. Different manufacturers specify CTR at different input current test conditions (500µA vs 1.6mA). Higher CTR indicates greater output current for a given input current. All substitute parts provide sufficient CTR for typical optoisolator applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed are RoHS3 compliant. The original HCPL-4701#320 is RoHS non-compliant. RoHS3 compliance is required for new designs and applications subject to RoHS regulations.

Q: What is the significance of packaging variants (Tube, Tape & Reel, Cut Tape)?

A: Packaging affects order quantity and handling. Tube packaging is for small quantities. Tape & Reel (TR) and Cut Tape (CT) packaging are for automated assembly. All variants maintain identical electrical specifications and 8-SMD Gull Wing package format. Selection depends on manufacturing process and order volume requirements.

Q: Can I use 6N139-X009T instead of 6N139-X009?

A: Yes. Both parts are electrically identical. The difference is packaging: 6N139-X009 is supplied in Tube, while 6N139-X009T is supplied in Tape & Reel. Selection depends on assembly process requirements.

Q: What operating temperature range should I select?

A: The original HCPL-4701#320 operates 0°C to 70°C. Substitute parts offer extended ranges: Everlight and Vishay parts operate -40°C to 85°C or -55°C to 100°C. Select based on application temperature requirements. Extended range parts are suitable for industrial and automotive applications.

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