HCPL3700SD Optoisolator Darlington Output Equivalent & Substitute Parts

Part Overview

The HCPL3700SD is a 2500Vrms optoisolator with Darlington output manufactured by onsemi in 8-SMD surface mount packaging. This component provides galvanic isolation for single-channel applications with 30mA output current capability and operates across the -40°C to 85°C temperature range. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility while meeting current supply chain requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL3700SD
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	2500Vrms
Output Type	Darlington
Voltage - Output (Max)	20V
Current - Output / Channel	30mA
Turn On / Turn Off Time (Typ)	6µs, 25µs
Rise / Fall Time (Typ)	45µs, 0.5µs
Input Type	AC, DC
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-SMD, Gull Wing
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the HCPL3700SD is determined by the following critical parameters:

Isolation Voltage: Minimum 2500Vrms (substitutes with 3750Vrms exceed this requirement)
Output Type: Darlington configuration required
Number of Channels: Single channel
Output Current: 30mA per channel
Maximum Output Voltage: 20V
Input Type: AC and DC compatible
Operating Temperature Range: -40°C to 85°C
Mounting Type: Surface mount
Package Configuration: 8-pin Gull Wing

The HCPL-3700 and HCPL-3760 series from Broadcom Limited satisfy these electrical and mechanical requirements. Substitutes are grouped by base product number (HCPL-3700 or HCPL-3760) and packaging format (Tube, Tape & Reel, or Cut Tape). All listed substitutes maintain functional equivalence with the obsolete HCPL3700SD while offering active product status and improved availability.

Parameter Comparison

Parameter	HCPL3700SD	HCPL-3700-360E	HCPL-3700-560E	HCPL-3760#300	HCPL-3760#500	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	Broadcom Limited
Voltage - Isolation	2500Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1	1	1	1	1	1
Output Type	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington
Voltage - Output (Max)	20V	20V	20V	20V	20V	20V	20V	20V	20V
Current - Output / Channel	30mA	30mA	30mA	30mA	30mA	30mA	30mA	30mA	30mA
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	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	14µs, 0.4µs
Input Type	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC
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	-40°C ~ 85°C
Mounting Type	Surface Mount	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	8-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Format	-	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tube	Tube	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Inventory (Pcs)	5700	650	1023	1910	1064	11405	1005	4300	928

Engineering Selection Recommendations

HCPL-3700 Series (Broadcom Limited)

The HCPL-3700-360E and HCPL-3700-560E are direct functional equivalents with improved switching performance. Both parts are ROHS3 compliant and carry active product status. The HCPL-3700-360E is packaged in Tube format with 650 units in stock, while the HCPL-3700-560E is supplied in Tape & Reel format with 1023 units available. These parts feature faster turn-on times (4µs versus 6µs) and reduced rise time (20µs versus 45µs) compared to the obsolete HCPL3700SD.

HCPL-3760 Series (Broadcom Limited)

The HCPL-3760 variants offer enhanced isolation voltage (3750Vrms versus 2500Vrms) while maintaining all other electrical and mechanical specifications. The HCPL-3760-300E, HCPL-3760-360E, HCPL-3760-500E, and HCPL-3760-560E are all ROHS3 compliant with active product status. The HCPL-3760-300E provides the highest inventory availability at 11,405 units in Tube packaging. The HCPL-3760#300 and HCPL-3760#500 are RoHS non-compliant alternatives with lower inventory levels.

Compliance Considerations

All HCPL-3700 and HCPL-3760 variants designated with the "-300E", "-360E", "-500E", and "-560E suffixes are ROHS3 compliant. Applications requiring RoHS compliance should exclude HCPL-3760#300 and HCPL-3760#500. All substitutes maintain REACH unaffected status and EAR99 export classification consistent with the original HCPL3700SD.

Frequently Asked Questions (FAQ)

Q: Can HCPL-3760 series parts directly replace HCPL3700SD in existing designs?

A: Yes. The HCPL-3760 series maintains electrical and mechanical compatibility with the HCPL3700SD. The increased isolation voltage (3750Vrms versus 2500Vrms) provides enhanced safety margin without affecting circuit operation. All other parameters including output current, voltage, temperature range, and package configuration are identical.

Q: What is the difference between HCPL-3700 and HCPL-3760 series?

A: The primary difference is isolation voltage rating. HCPL-3700 series provides 3750Vrms isolation, while HCPL-3760 series also provides 3750Vrms isolation. Both series are functionally equivalent to the obsolete HCPL3700SD (2500Vrms) and offer improved switching performance with faster turn-on and rise times.

Q: How do packaging formats affect part selection?

A: Packaging format determines supply method and quantity per unit. Tube packaging is suitable for lower-volume applications and manual assembly. Tape & Reel (TR) format is optimized for automated pick-and-place assembly. Cut Tape (CT) & Digi-Reel® provides flexibility for mixed-volume requirements. All formats contain identical components with identical electrical specifications.

Q: Are there RoHS compliance differences among the substitute parts?

A: Yes. Parts designated with "-300E", "-360E", "-500E", and "-560E suffixes are ROHS3 compliant. The HCPL-3760#300 and HCPL-3760#500 variants are RoHS non-compliant. For applications requiring RoHS compliance, select only the "-E" suffix variants.

Q: What inventory levels should I consider for procurement?

A: The HCPL-3760-300E offers the highest availability at 11,405 units. The HCPL-3760-500E provides 4,300 units. The HCPL-3700-560E and HCPL-3760#300 offer moderate availability at 1,023 and 1,910 units respectively. Lower-stock alternatives include HCPL-3700-360E (650 units) and HCPL-3760-360E (1,005 units).

Q: Do switching time differences between substitutes affect circuit design?

A: The HCPL-3700 series exhibits faster switching (4µs turn-on, 20µs rise time) compared to the original HCPL3700SD (6µs turn-on, 45µs rise time). The HCPL-3760 series provides intermediate switching performance (4.5µs turn-on, 14µs rise time). These improvements are generally beneficial and do not require circuit redesign. Applications with strict timing requirements should confirm compatibility with the specific substitute selected.

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