HCPL-4504#520 Equivalent & Substitute Parts

Part Overview

The HCPL-4504#520 is a 5000Vrms optoisolator with transistor output, single channel, housed in 8-SMD surface mount package. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for new designs and production continuity. Substitute parts must maintain isolation voltage, channel configuration, output type, and thermal operating range to ensure direct circuit compatibility.

Key Parameters

Parameter	HCPL-4504#520
Manufacturer	Broadcom Limited
Voltage - Isolation	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	25% @ 16mA
Current Transfer Ratio (Max)	60% @ 16mA
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Operating Temperature	-55°C ~ 100°C
Package / Case	8-SMD, Gull Wing
Mounting Type	Surface Mount
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

Voltage - Isolation: 5000Vrms minimum
Number of Channels: 1
Package / Case: 8-SMD, Gull Wing
Mounting Type: Surface Mount
Operating Temperature Range: -55°C ~ 100°C
Current - Output / Channel: 8mA
Input Type: DC

Substitute parts are grouped into two categories based on output configuration:

Category A - Direct Output Match (Transistor Output Only): HCPL-4504-520E maintains identical output type (transistor without base connection) and identical electrical specifications.

Category B - Enhanced Output Configuration (Transistor with Base Output): 6N135SMT&R, 6N136-X017T, and 6N136SMT&R feature transistor with base output, providing additional circuit design flexibility while maintaining core isolation and switching characteristics.

Parameter Comparison

Parameter	HCPL-4504#520	HCPL-4504-520E	6N135SMT&R	6N136-X017T	6N136SMT&R
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5300Vrms	5000Vrms
Number of Channels	1	1	1	1	1
Output Type	Transistor	Transistor	Transistor with Base	Transistor with Base	Transistor with Base
Current Transfer Ratio (Min)	25% @ 16mA	25% @ 16mA	7% @ 16mA	19% @ 16mA	19% @ 16mA
Current Transfer Ratio (Max)	60% @ 16mA	60% @ 16mA	50% @ 16mA	Not Specified	50% @ 16mA
Voltage - Output (Max)	20V	20V	20V	15V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.5V	1.5V	1.45V	1.33V	1.45V
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	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
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Active

Engineering Selection Recommendations

HCPL-4504-520E is the primary substitute for direct replacement. It maintains identical electrical specifications and output configuration while offering active product status and ROHS3 compliance. Packaging is Tape & Reel (TR) format with 1043 units in stock.

6N135SMT&R and 6N136SMT&R are functionally equivalent alternatives with transistor with base output configuration. Both are ROHS3 compliant and active products. 6N136SMT&R provides identical 5000Vrms isolation and 20V maximum output voltage. 6N135SMT&R offers lower minimum current transfer ratio (7% vs. 25%) but maintains 50% maximum ratio. Both support the full -55°C to 100°C operating range.

6N136-X017T provides the highest isolation voltage (5300Vrms) with transistor with base output. Maximum output voltage is 15V, which may require circuit evaluation if 20V output is required. This part is ROHS3 compliant and active, with 784 units in stock.

All substitute parts maintain 8-SMD surface mount package configuration, single channel architecture, and 8mA output current rating. Selection should be based on output configuration requirements (transistor only vs. transistor with base), isolation voltage margin, and maximum output voltage compatibility with the target circuit.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4504-520E be used as a direct replacement for HCPL-4504#520?

A: Yes. HCPL-4504-520E maintains identical electrical specifications including 5000Vrms isolation, 25-60% current transfer ratio, 20V maximum output voltage, and 8-SMD package configuration. The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between transistor output and transistor with base output?

A: Transistor output (HCPL-4504#520, HCPL-4504-520E) provides collector and emitter connections only. Transistor with base output (6N135SMT&R, 6N136-X017T, 6N136SMT&R) includes an additional base connection, allowing external base drive control and enhanced circuit design flexibility. Both configurations support identical isolation voltage and output current ratings.

Q: Is 6N136-X017T compatible if my circuit requires 20V maximum output voltage?

A: 6N136-X017T specifies 15V maximum output voltage, compared to 20V for HCPL-4504#520 and other substitutes. Circuit compatibility depends on actual operating voltage requirements. If the design operates above 15V, this part is not suitable.

Q: Are all substitute parts RoHS compliant?

A: HCPL-4504-520E, 6N135SMT&R, 6N136-X017T, and 6N136SMT&R are all ROHS3 compliant. The original HCPL-4504#520 is RoHS non-compliant. Compliance requirements should be verified against your application and regulatory standards.

Q: What is the current transfer ratio difference between substitutes?

A: HCPL-4504#520 and HCPL-4504-520E specify 25-60% CTR @ 16mA. 6N135SMT&R specifies 7-50% CTR @ 16mA, providing lower minimum but comparable maximum. 6N136-X017T specifies 19% minimum CTR @ 16mA. 6N136SMT&R specifies 19-50% CTR @ 16mA. Circuit designs relying on minimum CTR specifications should account for these variations.

Q: Can I use parts with different isolation voltages interchangeably?

A: All substitutes meet or exceed the 5000Vrms isolation requirement. 6N136-X017T provides 5300Vrms, offering additional isolation margin. Higher isolation voltage does not prevent substitution; it provides enhanced safety margin. Circuit compatibility is maintained across all listed parts.

Q: What packaging format is available for these substitutes?

A: All substitute parts are supplied in Tape & Reel (TR) format, standard for surface mount production. Physical package is 8-SMD, Gull Wing configuration, identical to the original HCPL-4504#520.

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