HCPL-073A Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL-073A is a 2-channel optoisolator with Darlington output manufactured by Broadcom Limited. This component provides 3750Vrms isolation voltage and is designed for applications requiring high-voltage signal isolation in 8-SOIC surface mount packaging. The part is currently active in production with 2200 units in stock. Equivalent and substitute parts are identified for applications where alternative sourcing, packaging formats, or extended operating temperature ranges are required.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL-073A
Manufacturer	Broadcom Limited
Category	Optoisolators
Number of Channels	2
Voltage - Isolation	3750Vrms
Current Transfer Ratio (Min)	600% @ 500µA
Current Transfer Ratio (Max)	8000% @ 500µA
Turn On / Turn Off Time (Typ)	3µs, 34µs
Output Type	Darlington
Voltage - Output (Max)	18V
Current - Output / Channel	60mA
Voltage - Forward (Vf) (Typ)	1.25V
Current - DC Forward (If) (Max)	5 mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the HCPL-073A are grouped based on the following substitution criteria:

Direct Parametric Equivalents maintain all critical electrical and mechanical parameters within the same tolerance bands:

Number of channels: 2
Output type: Darlington
Package: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Current output per channel: 60mA

Functional Equivalents provide the same 2-channel Darlington optoisolator functionality but with variations in isolation voltage, current transfer ratio ranges, switching speed, or operating temperature range. These parts are suitable for applications where the specified parameter differences do not impact system performance.

The HCPL-073A-000E is a direct parametric equivalent differing only in packaging format (Tube vs. unspecified) and RoHS compliance status.

The FOD073L, FOD073LR2, HCPL0731, and HCPL0731R2 are functional equivalents with the following key parameter variations:

Isolation voltage: 2500Vrms (vs. 3750Vrms for HCPL-073A)
Current transfer ratio ranges: 400-7000% or 400-5000% (vs. 600-8000%)
Switching speed: 5µs/25µs or 300ns/1.6µs (vs. 3µs/34µs)
Operating temperature: -40°C to 85°C (vs. 0°C to 70°C)
Maximum output voltage: 7V or 18V (vs. 18V)

Parameter Comparison

Parameter	HCPL-073A	HCPL-073A-000E	FOD073L	FOD073LR2	HCPL0731	HCPL0731R2
Manufacturer	Broadcom Limited	Broadcom Limited	Fairchild Semiconductor	Fairchild Semiconductor	onsemi	onsemi
Number of Channels	2	2	2	2	2	2
Voltage - Isolation	3750Vrms	3750Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms
Current Transfer Ratio (Min)	600% @ 500µA	600% @ 500µA	400% @ 500µA	400% @ 500µA	400% @ 500µA	400% @ 500µA
Current Transfer Ratio (Max)	8000% @ 500µA	8000% @ 500µA	7000% @ 500µA	7000% @ 500µA	5000% @ 500µA	5000% @ 500µA
Turn On / Turn Off Time (Typ)	3µs, 34µs	3µs, 34µs	5µs, 25µs	5µs, 25µs	300ns, 1.6µs	300ns, 1.6µs
Output Type	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington
Voltage - Output (Max)	18V	18V	7V	7V	18V	18V
Current - Output / Channel	60mA	60mA	60mA	60mA	60mA	60mA
Voltage - Forward (Vf) (Typ)	1.25V	1.25V	1.35V	1.35V	1.35V	1.35V
Current - DC Forward (If) (Max)	5 mA	5 mA	20 mA	20 mA	20 mA	20 mA
Operating Temperature	0°C ~ 70°C	0°C ~ 70°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
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not specified	Not specified	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

HCPL-073A-000E is the primary direct substitute for HCPL-073A. Both parts are manufactured by Broadcom Limited and maintain identical electrical specifications. The HCPL-073A-000E offers ROHS3 compliance, addressing regulatory requirements where the original HCPL-073A does not. Selection between these two parts depends on RoHS compliance mandates for the end application. Packaging format differs (Tube vs. unspecified), which may affect procurement and assembly processes.

FOD073L and FOD073LR2 (Fairchild Semiconductor) are functional equivalents suitable for applications where 2500Vrms isolation voltage is sufficient. These parts feature faster turn-off time (25µs vs. 34µs) and extended operating temperature range (-40°C to 85°C). The maximum output voltage is limited to 7V compared to 18V for the HCPL-073A. FOD073LR2 is supplied in Bulk packaging, while FOD073L packaging is unspecified. Both are ROHS3 compliant.

HCPL0731 and HCPL0731R2 (onsemi) are functional equivalents with 2500Vrms isolation voltage and significantly faster switching characteristics (300ns turn-on, 1.6µs turn-off). These parts maintain 18V maximum output voltage and support extended operating temperature range (-40°C to 85°C). Both are ROHS3 compliant. HCPL0731 is supplied in Tube packaging; HCPL0731R2 is supplied in Tape & Reel format.

Selection among functional equivalents should account for isolation voltage requirements, switching speed specifications, and operating temperature range constraints of the target application. All substitute parts maintain 2-channel Darlington output configuration and 60mA per-channel current capability.

Frequently Asked Questions (FAQ)

Q: Can HCPL-073A-000E be used as a direct replacement for HCPL-073A?

A: Yes. HCPL-073A-000E is a direct parametric equivalent with identical electrical specifications. The primary difference is RoHS compliance status (ROHS3 Compliant vs. non-compliant) and packaging format (Tube). Electrical performance and pin compatibility are equivalent.

Q: What are the key differences between HCPL-073A and the Fairchild FOD073L/FOD073LR2 parts?

A: The FOD073L and FOD073LR2 have lower isolation voltage (2500Vrms vs. 3750Vrms), lower maximum output voltage (7V vs. 18V), and lower current transfer ratio maximum (7000% vs. 8000%). However, they offer faster turn-off time (25µs vs. 34µs) and extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C). These parts are suitable for applications where the specified parameter differences do not impact system requirements.

Q: What are the key differences between HCPL-073A and the onsemi HCPL0731/HCPL0731R2 parts?

A: The HCPL0731 and HCPL0731R2 have lower isolation voltage (2500Vrms vs. 3750Vrms) and lower current transfer ratio maximum (5000% vs. 8000%). However, they feature significantly faster switching speed (300ns turn-on, 1.6µs turn-off vs. 3µs, 34µs) and maintain 18V maximum output voltage. These parts support extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C).

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and pin compatibility with HCPL-073A. Packaging formats (Tube, Bulk, Tape & Reel) differ for procurement and assembly purposes but do not affect electrical performance or PCB mounting.

Q: Which substitute part offers the fastest switching performance?

A: HCPL0731 and HCPL0731R2 offer the fastest switching characteristics with 300ns turn-on time and 1.6µs turn-off time. These parts are suitable for applications requiring rapid signal isolation transitions.

Q: Are all substitute parts RoHS compliant?

A: HCPL-073A-000E, FOD073LR2, HCPL0731, and HCPL0731R2 are ROHS3 compliant. FOD073L RoHS status is not specified. The original HCPL-073A is RoHS non-compliant.

Q: What is the difference between HCPL0731 and HCPL0731R2?

A: HCPL0731 and HCPL0731R2 are electrically identical. The difference is packaging format: HCPL0731 is supplied in Tube packaging, while HCPL0731R2 is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and procurement preferences.

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