HCPL4503TM Equivalent & Substitute Parts

Part Overview

The HCPL4503TM is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications requiring 5000Vrms isolation rating. This component features a single channel configuration in an 8-DIP through-hole package and is currently classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity and procurement planning. Substitute parts maintain the core electrical and mechanical specifications while offering improved availability and product status options.

Key Parameters

Parameter	Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Turn On / Turn Off Time (Typ)	250ns, 260ns
Output Type	Transistor with Base
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.45V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-40°C ~ 100°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.400", 10.16mm)

Substitute Part Grouping Explanation

Substitute parts for the HCPL4503TM are classified based on electrical parameter equivalence and mechanical compatibility. The primary substitution criteria are:

Voltage isolation rating of 5000Vrms
Single channel configuration
Transistor with base output type
Current transfer ratio range of 19% to 50% @ 16mA
Maximum output voltage of 20V
Maximum output current of 8mA per channel
Operating temperature range of -40°C to 100°C

Substitutes are grouped into two categories: direct pin-compatible replacements (same through-hole DIP package) and parametric equivalents (surface mount alternatives). The HCNW4502 represents a cross-manufacturer alternative with slightly different electrical characteristics that remain functionally compatible within the specified isolation and output parameters.

Parameter Comparison

Parameter	HCPL4503TM	HCPL4503M	HCPL4503TSVM	HCNW4502
Manufacturer	onsemi	onsemi	onsemi	Broadcom Limited
Product Status	Obsolete	Active	Active	Active
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1
Current Transfer Ratio (Min)	19% @ 16mA	19% @ 16mA	19% @ 16mA	15% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA	50% @ 16mA	50% @ 16mA	Not specified
Turn On / Turn Off Time (Typ)	250ns, 260ns	250ns, 260ns	250ns, 260ns	1µs, 1µs (Max)
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor
Voltage - Output (Max)	20V	20V	20V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.45V	1.45V	1.45V	1.68V
Current - DC Forward (If) (Max)	25mA	25mA	25mA	25mA
Operating Temperature	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Surface Mount	Through Hole
Package / Case	8-DIP (0.400", 10.16mm)	8-DIP (0.300", 7.62mm)	8-SMD, Gull Wing	8-DIP (0.400", 10.16mm)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

HCPL4503M is the primary direct substitute for the HCPL4503TM. Both parts are manufactured by onsemi with identical electrical specifications and through-hole mounting. The HCPL4503M is currently in active production status, ensuring long-term availability. The package footprint differs slightly (0.300" versus 0.400" DIP spacing), requiring PCB layout verification before implementation. HCPL4503M carries ROHS3 compliance certification, meeting modern environmental standards.

HCPL4503TSVM provides a parametrically equivalent alternative for applications where surface mount technology is preferred or required. This part maintains all critical electrical parameters and isolation specifications while offering the same onsemi manufacturing quality and ROHS3 compliance. Surface mount implementation requires different assembly processes and PCB design considerations.

HCNW4502 is a cross-manufacturer substitute from Broadcom Limited, suitable for applications where the slightly lower current transfer ratio minimum (15% versus 19%) and extended turn-on/turn-off time (1µs versus 250ns) are acceptable. This part maintains the 5000Vrms isolation rating and 8-DIP through-hole package compatibility with the original HCPL4503TM. However, HCNW4502 is RoHS non-compliant and operates within a narrower temperature range (-55°C to 85°C versus -40°C to 100°C), which may impact suitability for specific applications.

Frequently Asked Questions (FAQ)

Q: Can HCPL4503M be used as a direct replacement for HCPL4503TM without PCB modifications?

A: HCPL4503M is electrically equivalent but has a different DIP package spacing (0.300" versus 0.400"). PCB layout verification is required to confirm pin-to-pin compatibility with existing board designs. Pin assignments remain identical.

Q: What are the key differences between HCPL4503TSVM and HCPL4503M?

A: Both parts are electrically identical with matching isolation voltage, current transfer ratios, and switching times. The primary difference is mounting technology: HCPL4503TSVM is surface mount (8-SMD Gull Wing), while HCPL4503M is through-hole (8-DIP). Assembly process and PCB design differ accordingly.

Q: Is HCNW4502 suitable for high-speed switching applications?

A: HCNW4502 has a maximum turn-on/turn-off time of 1µs, compared to 250ns typical for HCPL4503TM. Applications requiring switching speeds faster than 1µs should use HCPL4503M or HCPL4503TSVM instead.

Q: What compliance certifications should I verify for my application?

A: HCPL4503M and HCPL4503TSVM are ROHS3 compliant. HCNW4502 is RoHS non-compliant. All three parts carry REACH Unaffected status and EAR99 ECCN classification. Verify compliance requirements against your specific application and regional standards.

Q: Does operating temperature range affect part selection?

A: HCPL4503M and HCPL4503TSVM operate from -40°C to 100°C. HCNW4502 operates from -55°C to 85°C. Applications requiring operation above 85°C or below -55°C must use onsemi parts. Applications with narrower temperature requirements may use any substitute.

Q: What is the moisture sensitivity level for these parts?

A: HCPL4503M has MSL 1 (Unlimited). HCPL4503TSVM has MSL 1 (Unlimited). HCNW4502 has MSL 1 (Unlimited). All parts have unlimited shelf life under standard storage conditions.

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