HCPL3700S Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL3700S is a 2500Vrms Darlington output optoisolator manufactured by onsemi in 8-SMD surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The HCPL3700S provides galvanic isolation for AC and DC input signals with a single-channel Darlington output configuration suitable for industrial control and power management applications.

Key Parameters

Parameter	HCPL3700S Value
Manufacturer	onsemi
Category	Optoisolators
Packaging	Tube
Number of Channels	1
Voltage - Isolation	2500Vrms
Turn On / Turn Off Time (Typ)	6µs, 25µs
Rise / Fall Time (Typ)	45µs, 0.5µs
Input Type	AC, DC
Output Type	Darlington
Voltage - Output (Max)	20V
Current - Output / Channel	30mA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the HCPL3700S are qualified based on the following criteria:

Core Compatibility Parameters:

Single-channel Darlington output optoisolator configuration
AC and DC input signal support
20V maximum output voltage
30mA output current per channel
8-SMD Gull Wing package footprint
-40°C to 85°C operating temperature range
Surface mount mounting type
MSL 1 (Unlimited) moisture sensitivity

Isolation Voltage Consideration: Substitute parts feature 3750Vrms isolation voltage, which exceeds the HCPL3700S 2500Vrms specification. This higher isolation rating provides enhanced safety margins and is functionally compatible for applications designed for the original 2500Vrms component.

Timing Characteristics: Substitute parts exhibit faster switching performance (4µs to 4.5µs turn-on time versus 6µs) and improved rise/fall times, representing performance enhancements over the original design.

Compliance and Status: Active substitute parts carry ROHS3 compliance certification, ensuring regulatory alignment for current manufacturing environments.

Parameter Comparison

Parameter	HCPL3700S	HCPL-3700-360E	HCPL-3700-560E	HCPL-3760#300	HCPL-3760-300E	HCPL-3760-360E	HCPL-3760-500E	HCPL-3760-560E
Manufacturer	onsemi	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Voltage - Isolation	2500Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Turn On / Turn Off Time (Typ)	6µs, 25µs	4µs, 10µs	4µs, 10µs	4.5µs, 8µs	4.5µs, 8µs	4.5µs, 8µs	4.5µs, 8µs	4.5µs, 8µs
Rise / Fall Time (Typ)	45µs, 0.5µs	20µs, 0.3µs	20µs, 0.3µs	14µs, 0.4µs	14µs, 0.4µs	14µs, 0.4µs	14µs, 0.4µs	14µs, 0.4µs
Input Type	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC
Output Type	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington
Voltage - Output (Max)	20V	20V	20V	20V	20V	20V	20V	20V
Current - Output / Channel	30mA	30mA	30mA	30mA	30mA	30mA	30mA	30mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (HCPL-3700 Series): HCPL-3700-360E and HCPL-3700-560E are direct functional replacements from the Broadcom HCPL-3700 base product family. Both maintain ROHS3 compliance and active product status. These parts offer improved switching performance with 4µs turn-on time and 20µs rise time compared to the original HCPL3700S specifications. Packaging options include Tube (360E) and Tape & Reel (560E) formats.

Secondary Substitutes (HCPL-3760 Series): HCPL-3760-300E, HCPL-3760-360E, HCPL-3760-500E, and HCPL-3760-560E represent the enhanced HCPL-3760 product line with 3750Vrms isolation rating. All carry ROHS3 compliance and active status. These parts provide the fastest switching response with 4.5µs turn-on time and 14µs rise time. Packaging options span Tube, Tape & Reel, and Cut Tape formats.

Non-Compliant Alternative: HCPL-3760#300 and HCPL-3760#500 are functionally equivalent but carry RoHS non-compliant status. These parts are suitable only for applications where RoHS compliance is not required.

Selection Criteria:

For new designs requiring regulatory compliance: select ROHS3-compliant parts from either HCPL-3700 or HCPL-3760 series
For applications requiring fastest switching performance: HCPL-3760 series provides superior timing characteristics
For packaging preference: Tube packaging available in 360E and 300E variants; Tape & Reel available in 560E and 500E variants; Cut Tape available in 500E variant

Frequently Asked Questions (FAQ)

Q: Can HCPL-3760 series parts directly replace HCPL3700S in existing designs? A: Yes. The HCPL-3760 series maintains identical output voltage (20V maximum), output current (30mA), operating temperature range (-40°C to 85°C), and 8-SMD Gull Wing package footprint. The higher 3750Vrms isolation rating provides enhanced safety margins for applications originally designed for 2500Vrms isolation.

Q: What is the difference between HCPL-3700 and HCPL-3760 substitute families? A: Both families provide single-channel Darlington output optoisolators with identical electrical output specifications. The HCPL-3760 series features 3750Vrms isolation versus 3750Vrms for HCPL-3700 series, and faster switching times (4.5µs turn-on versus 4µs). Both are ROHS3 compliant and active products.

Q: Are packaging variants (Tube, Tape & Reel, Cut Tape) electrically equivalent? A: Yes. Packaging variants of the same part number (e.g., HCPL-3760-360E in Tube versus HCPL-3760-560E in Tape & Reel) are electrically identical. Selection depends on manufacturing process requirements and quantity handling preferences.

Q: Why should I avoid HCPL-3760#300 and HCPL-3760#500? A: These parts carry RoHS non-compliant status. Use only in applications where RoHS compliance is not a regulatory requirement. ROHS3-compliant alternatives are available in the same product families.

Q: What is the impact of faster switching times in substitute parts? A: Substitute parts exhibit faster turn-on (4µs to 4.5µs versus 6µs) and faster rise times (14µs to 20µs versus 45µs). These improvements enhance circuit response speed and are backward compatible with designs originally specified for the slower HCPL3700S timing.

Q: Is the 8-SMD Gull Wing package footprint identical across all substitutes? A: Yes. All substitute parts maintain the 8-SMD Gull Wing surface mount package configuration, ensuring PCB layout compatibility with the original HCPL3700S design.

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