HCPL-4503#300 Equivalent & Substitute Parts

Part Overview

The HCPL-4503#300 is a single-channel optoisolator with transistor output manufactured by Broadcom Limited. This component provides 3750Vrms isolation and is designed for DC input applications requiring galvanic isolation in 8-DIP Gull Wing surface mount packaging. The part is currently active in production with 888 pieces in stock. Substitute parts are necessary to address supply availability, packaging preferences, enhanced isolation voltage ratings, or compliance requirements such as RoHS3 certification.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL-4503#300
Manufacturer	Broadcom Limited
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	3750Vrms
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Turn On / Turn Off Time (Typ)	200ns, 600ns
Input Type	DC
Output Type	Transistor
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.5V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	8-SMD, Gull Wing
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the HCPL-4503#300 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Single channel configuration (1 channel required)
DC input type
Transistor output type (standard or with base)
8-SMD Gull Wing surface mount package
Operating temperature range: -55°C ~ 100°C
Output current capability: 8mA per channel
Current - DC Forward (If) (Max): 25mA

Allowable Variation Parameters:

Voltage - Isolation: minimum 3750Vrms (higher values acceptable)
Voltage - Output (Max): minimum 20V (higher values acceptable)
Current Transfer Ratio (Min): minimum 19% @ 16mA (higher values acceptable)
Turn On / Turn Off Time: variations acceptable within application requirements
Voltage - Forward (Vf) (Typ): variations acceptable within application requirements
RoHS Status: RoHS3 compliant variants acceptable as upgrades
Packaging format: Tube or Tape & Reel (TR) both acceptable

Substitute parts must maintain electrical and mechanical compatibility while meeting or exceeding the isolation voltage and output specifications of the original part.

Parameter Comparison

Parameter	HCPL-4503#300	HCPL-4503-300E	PS8502L2-AX	PS8502L2-E3-AX	PS8502L2-V-AX	PS8502L2-V-E3-AX	PS8502L3-E3-AX	PS8502L3-V-E3-AX	SFH6345-X007	SFH6345-X007T	SFH6345-X009
Manufacturer	Broadcom Limited	Broadcom Limited	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics	Vishay Semiconductor	Vishay Semiconductor	Vishay Semiconductor
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Voltage - Isolation	3750Vrms	3750Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5300Vrms	5300Vrms	5300Vrms
Current Transfer Ratio (Min)	19% @ 16mA	19% @ 16mA	15% @ 16mA	15% @ 16mA	15% @ 16mA	15% @ 16mA	15% @ 16mA	15% @ 16mA	19% @ 16mA	19% @ 16mA	19% @ 16mA
Turn On / Turn Off Time (Typ)	200ns, 600ns	200ns, 600ns	220ns, 350ns	220ns, 350ns	—	220ns, 350ns	220ns, 350ns	—	300ns, 300ns	300ns, 300ns	300ns, 300ns
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor with Base	Transistor	Transistor	Transistor with Base	Transistor	Transistor	Transistor
Voltage - Output (Max)	20V	20V	35V	35V	35V	35V	35V	35V	25V	25V	25V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.5V	1.5V	1.7V	1.7V	1.7V	1.7V	1.7V	1.7V	1.33V	1.33V	1.33V
Current - DC Forward (If) (Max)	25mA	25mA	25mA	25mA	25mA	25mA	25mA	25mA	25mA	25mA	25mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	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	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	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)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Broadcom Equivalent: HCPL-4503-300E is the direct equivalent to HCPL-4503#300 with identical electrical specifications and packaging. The primary distinction is RoHS3 compliance, making this the preferred selection for applications requiring environmental compliance certification.

Renesas PS8502 Series (L2, L3 variants): The PS8502L2-AX, PS8502L2-E3-AX, PS8502L2-V-AX, PS8502L2-V-E3-AX, PS8502L3-E3-AX, and PS8502L3-V-E3-AX optoisolators provide enhanced isolation voltage (5000Vrms) compared to the HCPL-4503#300 (3750Vrms). All variants maintain the required 8mA output current and DC input configuration. The L2 and L3 designations indicate different current transfer ratio grades. Tape & Reel (TR) packaging variants (E3-AX suffix) are available for high-volume production. Transistor with Base output variants (V-suffix) provide additional design flexibility for applications requiring base drive control.

Vishay SFH6345 Series: The SFH6345-X007, SFH6345-X007T, and SFH6345-X009 optoisolators deliver the highest isolation voltage rating (5300Vrms) among available substitutes. These components maintain the 19% minimum current transfer ratio matching the original HCPL-4503#300 specification. The SFH6345-X007T and SFH6345-X009 variants are available in Tape & Reel packaging for automated assembly. All Vishay variants are RoHS3 compliant and carry active product status.

Compliance and Availability: All substitute parts listed are active products with confirmed inventory availability. Broadcom HCPL-4503-300E provides direct compatibility with existing designs. Renesas and Vishay alternatives offer enhanced isolation voltage ratings and RoHS3 compliance as standard features, supporting modern supply chain requirements and environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can I substitute HCPL-4503-300E for HCPL-4503#300 without circuit modifications?

A: Yes. HCPL-4503-300E is electrically and mechanically identical to HCPL-4503#300. The only difference is RoHS3 compliance certification. No circuit modifications are required.

Q: What is the primary advantage of using Renesas PS8502 series optoisolators as substitutes?

A: The PS8502 series provides 5000Vrms isolation voltage compared to the HCPL-4503#300 specification of 3750Vrms. This 33% increase in isolation rating provides additional safety margin in high-voltage isolation applications. All PS8502 variants maintain the required 8mA output current and DC input type.

Q: Are there differences between PS8502L2 and PS8502L3 variants?

A: The L2 and L3 designations indicate different current transfer ratio grades. Both maintain the 15% minimum current transfer ratio at 16mA input current, meeting the substitution requirement. Selection between L2 and L3 depends on application-specific current transfer ratio requirements and availability.

Q: What does the "V" suffix in PS8502L2-V-AX indicate?

A: The V-suffix designates Transistor with Base output configuration, providing base drive access for applications requiring additional output control. Standard PS8502 variants without the V-suffix provide standard transistor output matching the HCPL-4503#300 configuration.

Q: Can I use Vishay SFH6345-X007 in place of HCPL-4503#300?

A: Yes. SFH6345-X007 meets all mandatory compatibility parameters: single channel, DC input, transistor output, 8-SMD Gull Wing package, -55°C to 100°C operating range, and 8mA output current. The SFH6345-X007 provides 5300Vrms isolation and 19% minimum current transfer ratio, both meeting or exceeding HCPL-4503#300 specifications.

Q: What is the difference between Tube and Tape & Reel (TR) packaging?

A: Tube packaging is suitable for manual assembly and lower-volume production. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly in high-volume manufacturing. Both packaging formats contain identical components; selection depends on assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant certification. The original HCPL-4503#300 is RoHS non-compliant. Substitution with any listed alternative provides RoHS3 compliance as a standard feature.

Q: Do substitute parts maintain the same turn-on and turn-off timing as HCPL-4503#300?

A: Turn-on and turn-off times vary among substitutes. HCPL-4503#300 specifies 200ns turn-on and 600ns turn-off. Renesas PS8502 series specifies 220ns turn-on and 350ns turn-off. Vishay SFH6345 series specifies 300ns for both turn-on and turn-off. Applications with strict timing requirements must verify compatibility with actual circuit performance.

Q: Can I mix different substitute part manufacturers in the same design?

A: All substitute parts maintain electrical and mechanical compatibility with the HCPL-4503#300 footprint and pinout. However, mixing manufacturers in the same circuit may introduce minor variations in timing characteristics and current transfer ratios. Design verification is recommended when combining parts from different manufacturers.

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