HCPL-4701#520 Equivalent & Substitute Parts

Part Overview

The HCPL-4701#520 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 variations in switching speed and operating temperature range.

Key Parameters

Parameter	HCPL-4701#520
Voltage - Isolation	5000Vrms
Number of Channels	1
Output Type	Darlington with Base
Current - Output / Channel	60mA
Voltage - Output (Max)	18V
Current Transfer Ratio (Min)	600% @ 500µA
Operating Temperature	0°C ~ 70°C
Package / Case	8-SMD, Gull Wing
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

Voltage - Isolation: minimum 5000Vrms (5300Vrms acceptable as higher rating)
Number of Channels: 1 (single channel required)
Output Type: Darlington with Base (configuration must match)
Current - Output / Channel: 60mA (minimum requirement)
Package / Case: 8-SMD, Gull Wing (physical compatibility)
Input Type: DC (functional requirement)

Acceptable variations include:

Current Transfer Ratio: minimum 300% @ 1.6mA or higher
Operating Temperature: wider ranges acceptable
Turn On / Turn Off Time: variations acceptable if within application tolerance
Voltage - Forward (Vf): minor variations acceptable (1.25V to 1.4V range)
RoHS Compliance: ROHS3 compliant substitutes preferred for new designs

Parameter Comparison

Parameter	HCPL-4701#520	HCPL-4701-520E	6N138S1(TA)	6N138S1(TB)	6N138SMT/R	6N139-X009	6N139-X017T	6N139S1(TA)
Manufacturer	Broadcom Limited	Broadcom Limited	Everlight Electronics	Everlight Electronics	Isocom Components	Vishay Semiconductor	Vishay Semiconductor	Everlight Electronics
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5300Vrms	5300Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1	1
Output Type	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base	Darlington with Base
Current - Output / Channel	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Voltage - Output (Max)	18V	18V	7V	7V	7V	18V	18V	18V
Current Transfer Ratio (Min)	600% @ 500µA	600% @ 500µA	300% @ 1.6mA	300% @ 1.6mA	300% @ 1.6mA	500% @ 1.6mA	500% @ 1.6mA	500% @ 1.6mA
Turn On / Turn Off Time (Typ)	3µs, 34µs	3µs, 34µs	1.4µs, 8µs	1.4µs, 8µs	10µs, 35µs (Max)	600ns, 1.5µs	600ns, 1.5µs	200ns, 1.7µs
Voltage - Forward (Vf) (Typ)	1.25V	1.25V	1.3V	1.3V	1.3V	1.4V	1.4V	1.3V
Current - DC Forward (If) (Max)	10mA	10mA	20mA	20mA	20mA	25mA	25mA	20mA
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 85°C
Package / Case	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Broadcom Replacement: HCPL-4701-520E is the primary substitute, offering identical electrical specifications and packaging. This part maintains the original 5000Vrms isolation, 600% minimum current transfer ratio, and 18V maximum output voltage. The transition from RoHS non-compliant to ROHS3 compliant status makes this the preferred choice for new designs. Packaging changes from bulk to Tape & Reel format.

Everlight Electronics Alternatives: The 6N138S1 series (TA, TA-V, TB, TB-V variants) and 6N139S1(TA) provide active alternatives with ROHS3 compliance. These parts maintain 5000Vrms isolation and 60mA output current. The 6N138S1 variants feature reduced maximum output voltage (7V vs. 18V) and lower current transfer ratio (300% @ 1.6mA), requiring circuit evaluation for applications demanding higher output voltage swing. The 6N139S1(TA) variant offers improved switching speed (200ns/1.7µs) and higher current transfer ratio (500% @ 1.6mA) with extended operating temperature range (-40°C to 85°C).

Isocom Components Alternative: 6N138SMT/R provides 5000Vrms isolation with ROHS3 compliance and high inventory availability. Output voltage is limited to 7V maximum. Switching characteristics (10µs/35µs maximum) are comparable to the original part.

Vishay Semiconductor Options: 6N139-X009, 6N139-X009T, and 6N139-X017T deliver enhanced specifications with 5300Vrms isolation rating and 18V maximum output voltage. These parts feature superior switching speed (600ns/1.5µs) and higher current transfer ratio (500% @ 1.6mA). Extended operating temperature range (-55°C to 100°C) supports demanding thermal environments. Packaging options include Tube, Tape & Reel, and Cut Tape formats.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4701-520E be used as a direct replacement for HCPL-4701#520?

A: Yes. HCPL-4701-520E is the direct Broadcom equivalent with identical electrical specifications, isolation voltage, output current, and package configuration. The primary difference is RoHS compliance status and packaging format (Tape & Reel vs. bulk).

Q: What is the key limitation when substituting with 6N138S1 series parts?

A: The 6N138S1 variants have a maximum output voltage of 7V compared to the original 18V specification. Applications requiring higher output voltage swing must use alternatives such as 6N139-X009, 6N139-X017T, or 6N139S1(TA), which maintain the 18V maximum output voltage.

Q: Are Everlight and Vishay parts pin-compatible with the original Broadcom device?

A: All substitute parts maintain the 8-SMD Gull Wing package configuration and Darlington with Base output topology. Pin compatibility is preserved across all listed alternatives.

Q: Which substitute offers the fastest switching performance?

A: The Vishay 6N139 series (6N139-X009, 6N139-X009T, 6N139-X017T) provides the fastest switching with 600ns turn-on and 1.5µs turn-off times. The Everlight 6N139S1(TA) offers intermediate performance at 200ns/1.7µs.

Q: What is the difference between 6N139-X009 and 6N139-X009T?

A: Both parts are electrically identical with 5300Vrms isolation and identical electrical specifications. The difference is packaging: 6N139-X009 is supplied in Tube format, while 6N139-X009T is supplied in Tape & Reel format.

Q: Can I use a substitute with a lower current transfer ratio?

A: Substitutes with lower current transfer ratio (300% @ 1.6mA vs. 600% @ 500µA) are acceptable if circuit design accommodates the reduced gain. Verify input drive current and output switching characteristics for your specific application.

Q: Which substitute has the widest operating temperature range?

A: The Vishay 6N139 series supports -55°C to 100°C, providing the widest temperature range. This exceeds the original 0°C to 70°C specification and is suitable for extended thermal environments.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed active substitutes carry ROHS3 compliance certification, making them suitable for applications with RoHS requirements. The original HCPL-4701#520 is RoHS non-compliant.

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