HCPL0638R1 Equivalent & Substitute Parts

Part Overview

The HCPL0638R1 is a logic output optoisolator manufactured by onsemi, featuring 2-channel open collector output with Schottky clamping, 3750Vrms isolation voltage, and 10kV/µs common mode transient immunity. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates at 10Mbps data rate with 75ns propagation delay and is packaged in 8-SOIC surface mount configuration.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL0638R1
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	2
Voltage - Isolation	3750Vrms
Common Mode Transient Immunity (Min)	10kV/µs
Output Type	Open Collector, Schottky Clamped
Current - Output / Channel	15 mA
Data Rate	10Mbps
Propagation Delay tpLH / tpHL (Max)	75ns, 75ns
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for HCPL0638R1 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Number of Channels: 2
Voltage - Isolation: 3750Vrms
Output Type: Open Collector, Schottky Clamped
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature: -40°C ~ 85°C

Performance Parameters (Allowable Variation):

Common Mode Transient Immunity (Min): 10kV/µs or higher
Data Rate: 10Mbps or higher
Propagation Delay: 75ns or lower
Current - Output / Channel: 15 mA or higher
Voltage - Supply: 4.5V ~ 5.5V (primary requirement)

Substitute parts are grouped into two categories:

Direct Equivalent (onsemi HCPL0638): Identical electrical and mechanical specifications with active product status.

Compatible Alternatives (Broadcom HCPL-063 series): Parts meeting or exceeding all mandatory parameters with enhanced performance characteristics in data rate, propagation delay, or common mode transient immunity.

Parameter Comparison

Part Number	Manufacturer	Product Status	Channels	Isolation (Vrms)	CMTI (kV/µs)	Data Rate (Mbps)	tpLH/tpHL (ns)	Output Current (mA)	Supply Voltage	RoHS Status
HCPL0638R1	onsemi	Obsolete	2	3750	10	10	75, 75	15	4.5-5.5V	N/A
HCPL0638	onsemi	Active	2	3750	10	10	75, 75	15	4.5-5.5V	ROHS3 Compliant
HCPL-063A	Broadcom Limited	Active	2	3750	1	10	100, 100	50	4.5-5.5V	RoHS non-compliant
HCPL-063A-000E	Broadcom Limited	Active	2	3750	1	10	100, 100	50	4.5-5.5V	ROHS3 Compliant
HCPL-063A-500E	Broadcom Limited	Active	2	3750	1	10	100, 100	50	4.5-5.5V	ROHS3 Compliant
HCPL-063L	Broadcom Limited	Active	2	3750	10	15	75, 75	50	2.7-3.6V, 4.5-5.5V	RoHS non-compliant
HCPL-063L-000E	Broadcom Limited	Active	2	3750	10	15	75, 75	50	2.7-3.6V, 4.5-5.5V	ROHS3 Compliant
HCPL-063L-060E	Broadcom Limited	Active	2	3750	10	15	75, 75	50	2.7-3.6V, 4.5-5.5V	ROHS3 Compliant
HCPL-063L-500E	Broadcom Limited	Active	2	3750	10	15	75, 75	50	2.7-3.6V, 4.5-5.5V	ROHS3 Compliant
HCPL-063L-560E	Broadcom Limited	Active	2	3750	10	15	75, 75	50	2.7-3.6V, 4.5-5.5V	ROHS3 Compliant
HCPL-063N	Broadcom Limited	Active	2	3750	15	10	100, 100	50	4.5-5.5V	RoHS non-compliant

Engineering Selection Recommendations

Primary Recommendation: HCPL0638 (onsemi)

The HCPL0638 is the direct active equivalent of HCPL0638R1. It maintains identical electrical specifications and mechanical packaging while offering ROHS3 compliance. This part is recommended for direct replacement in existing designs without circuit modification.

Secondary Recommendations: HCPL-063L Series (Broadcom Limited)

The HCPL-063L-500E, HCPL-063L-060E, and HCPL-063L-000E are suitable alternatives when higher data rate capability (15MBd) is acceptable. These parts maintain the 10kV/µs common mode transient immunity and 75ns propagation delay of the original part while providing 50mA output current per channel. ROHS3 compliance is available in all three variants. Dual supply voltage support (2.7V-3.6V and 4.5V-5.5V) provides additional design flexibility.

Alternative Consideration: HCPL-063N (Broadcom Limited)

The HCPL-063N offers enhanced common mode transient immunity (15kV/µs) with 50mA output current per channel. This part is suitable for applications requiring superior noise immunity. However, propagation delay increases to 100ns and data rate remains at 10MBd. RoHS non-compliance status must be evaluated against design requirements.

Not Recommended: HCPL-063A Series (Broadcom Limited)

The HCPL-063A variants exhibit reduced common mode transient immunity (1kV/µs), which falls below the original specification of 10kV/µs. While output current is increased to 50mA and data rate remains at 10MBd, the lower CMTI makes these parts unsuitable for applications sensitive to high-speed transient noise.

Frequently Asked Questions (FAQ)

Q: Can HCPL0638 directly replace HCPL0638R1 without circuit changes?

A: Yes. HCPL0638 is the active production equivalent with identical electrical and mechanical specifications. No circuit modifications are required.

Q: What is the key difference between HCPL-063L and HCPL-063A variants?

A: The primary difference is common mode transient immunity. HCPL-063L maintains 10kV/µs CMTI matching the original part, while HCPL-063A reduces CMTI to 1kV/µs. HCPL-063L also supports higher data rates (15MBd vs. 10MBd) and offers dual supply voltage operation.

Q: Are all Broadcom HCPL-063 variants pin-compatible with HCPL0638R1?

A: All listed Broadcom HCPL-063 variants use the same 8-SOIC package with identical pinout. Physical and electrical pin compatibility is maintained across all variants.

Q: What packaging options are available for HCPL-063L-500E?

A: HCPL-063L-500E is supplied in Cut Tape (CT) & Digi-Reel format. Alternative packaging formats are available in HCPL-063L-000E (Tube) and HCPL-063L-060E (Tube).

Q: Does HCPL-063L support the original 4.5V-5.5V supply voltage?

A: Yes. HCPL-063L supports dual supply voltage ranges: 2.7V-3.6V and 4.5V-5.5V. The 4.5V-5.5V range is fully compatible with HCPL0638R1 designs.

Q: What is the significance of the "-500E" suffix in part numbers?

A: The "-500E" suffix indicates Cut Tape (CT) & Digi-Reel packaging format. Parts without this suffix typically use Tube packaging. Both formats contain identical components with different delivery methods.

Q: Is RoHS compliance required for my application?

A: RoHS compliance requirements depend on end-use application and regional regulations. HCPL0638 and HCPL-063L series offer ROHS3-compliant variants. HCPL-063A and HCPL-063N variants include both compliant and non-compliant options.

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