HCPL-0931-500 Digital Isolator Equivalent & Substitute Parts

Part Overview

The HCPL-0931-500 is a general purpose digital isolator manufactured by Broadcom Limited, featuring 2500Vrms isolation voltage, 2 channels, and 110MBd data rate in an 8-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The device utilizes Giant Magnetoresistive (GMR) technology for signal isolation across galvanic barriers.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL-0931-500
Manufacturer	Broadcom Limited
Technology	GMR (Giant Magnetoresistive)
Number of Channels	2
Voltage - Isolation	2500Vrms
Data Rate	110MBd
Common Mode Transient Immunity (Min)	15kV/µs
Propagation Delay tpLH / tpHL (Max)	15ns / 15ns
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-55°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Isolation Voltage: Minimum 2500Vrms required
Number of Channels: 2 channels required
Data Rate: Minimum 110MBd for direct replacement
Common Mode Transient Immunity: Minimum 15kV/µs
Package: 8-SOIC form factor
Supply Voltage Range: 3V ~ 5.5V compatibility
Operating Temperature Range: Must support -55°C ~ 125°C or subset thereof

Substitute parts are grouped into three categories:

Category 1 - Parametric Equivalents (Broadcom GMR Technology): HCPL-0931-500E, HCPL-0900-500, HCPL-0900-500E. These maintain identical or superior electrical specifications with active product status and improved compliance ratings.

Category 2 - Manufacturer Recommended Substitutes (NVE IsoLoop® GMR Technology): IL 611-3E, IL 611-3ETR7, IL 712-3E, IL 612A-3E. These provide GMR-based isolation with equivalent or enhanced performance characteristics and active status.

Category 3 - Cross-Technology Alternatives (Texas Instruments Capacitive Coupling): ISO7321CD, ISO7321CDR, ISO7321FCD. These employ capacitive coupling technology with higher isolation voltage (3000Vrms) but reduced data rate (25Mbps), suitable only for lower-speed applications.

Parameter Comparison

Part Number	Manufacturer	Technology	Channels	Isolation (Vrms)	Data Rate	CMTI (kV/µs)	tpLH/tpHL (ns)	Supply (V)	Temp Range (°C)	Package	Status	RoHS
HCPL-0931-500	Broadcom	GMR	2	2500	110MBd	15	15/15	3-5.5	-55 to 125	8-SOIC	Obsolete	Non-compliant
HCPL-0931-500E	Broadcom	GMR	2	2500	110MBd	15	15/15	3-5.5	-55 to 125	8-SOIC	Active	ROHS3 Compliant
HCPL-0900-500	Broadcom	GMR	1	2500	110MBd	15	15/15	3-5.5	-55 to 125	8-SOIC	Active	Non-compliant
HCPL-0900-500E	Broadcom	GMR	1	2500	110MBd	15	15/15	3-5.5	-55 to 125	8-SOIC	Active	ROHS3 Compliant
IL 611-3E	NVE Corp	GMR	2	2500	100Mbps	15	15/15	3-5.5	-40 to 85	8-SOIC	Active	ROHS3 Compliant
IL 611-3ETR7	NVE Corp	GMR	2	2500	100Mbps	15	15/15	3-5.5	-40 to 85	8-SOIC	Active	ROHS3 Compliant
IL 712-3E	NVE Corp	GMR	2	2500	110Mbps	100	15/15	3-5.5	-40 to 100	8-SOIC	Active	ROHS3 Compliant
IL 612A-3E	NVE Corp	GMR	2	2500	10Mbps	15	75/25	3-5.5	-40 to 85	8-SOIC	Active	ROHS3 Compliant
ISO7321CD	Texas Instruments	Capacitive	2	3000	25Mbps	25	57/57	3-5.5	-40 to 125	8-SOIC	Active	ROHS3 Compliant
ISO7321CDR	Texas Instruments	Capacitive	2	3000	25Mbps	25	57/57	3-5.5	-40 to 125	8-SOIC	Active	ROHS3 Compliant
ISO7321FCD	Texas Instruments	Capacitive	2	3000	25Mbps	25	57/57	3-5.5	-40 to 125	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - HCPL-0931-500E: Direct parametric equivalent with identical electrical specifications. Active product status ensures long-term availability. ROHS3 compliance addresses regulatory requirements where the original part does not. Recommended for new designs and production transitions from the obsolete HCPL-0931-500.

Secondary Recommendation - IL 712-3E: Maintains 2-channel configuration, 2500Vrms isolation, and 110Mbps data rate. Exceeds CMTI specification at 100kV/µs versus 15kV/µs required. ROHS3 compliant with active status. Operating temperature range (-40°C to 100°C) covers the critical upper and lower bounds of the original specification. Suitable for applications requiring enhanced transient immunity.

Alternative for Reduced Data Rate Applications - IL 611-3E or IL 611-3ETR7: Maintains 2-channel, 2500Vrms isolation with 100Mbps data rate. Acceptable for applications not requiring the full 110MBd bandwidth. ROHS3 compliant and active. Operating temperature range (-40°C to 85°C) is narrower than the original part.

Cross-Technology Alternative - ISO7321 Series (CD, CDR, FCD): Capacitive coupling technology with 3000Vrms isolation voltage. Data rate limited to 25Mbps, suitable only for low-speed isolation applications. Not recommended as direct replacement for 110MBd applications. ROHS3 compliant with extended temperature support to 125°C.

Not Recommended - HCPL-0900 Series: Single-channel configuration does not meet the 2-channel requirement of the original part. Suitable only for applications requiring 1-channel isolation.

Not Recommended - IL 612A-3E: 10Mbps data rate and 75ns/25ns propagation delay significantly exceed the timing requirements of the original 110MBd specification. Suitable only for low-speed, low-bandwidth applications.

Frequently Asked Questions (FAQ)

Q: Can HCPL-0931-500E be used as a direct drop-in replacement for HCPL-0931-500?

A: Yes. HCPL-0931-500E is a parametric equivalent with identical electrical specifications, package, and pinout. The primary differences are active product status and ROHS3 compliance. No circuit modifications are required.

Q: What is the key difference between GMR and capacitive coupling technologies in these isolators?

A: GMR technology (Broadcom HCPL and NVE IL series) uses magnetic field sensing for isolation, while capacitive coupling (Texas Instruments ISO7321 series) uses AC coupling through capacitive barriers. Both achieve 2500Vrms isolation, but GMR devices in this comparison maintain higher data rates (100-110Mbps) compared to capacitive devices (25Mbps).

Q: Can IL 611-3E replace HCPL-0931-500 in a 110MBd application?

A: IL 611-3E operates at 100Mbps, which is 10% below the 110MBd specification of the original part. Substitution is not recommended for applications requiring the full 110MBd bandwidth. IL 712-3E is the appropriate NVE alternative for 110Mbps operation.

Q: Are there any temperature range limitations when substituting with NVE parts?

A: Yes. NVE IL series parts operate from -40°C to 85°C or -40°C to 100°C (IL 712-3E), compared to the original HCPL-0931-500 range of -55°C to 125°C. Applications requiring operation below -40°C or above 100°C must use HCPL-0931-500E or ISO7321 series (which supports -40°C to 125°C).

Q: Why is HCPL-0900-500E listed if it has only 1 channel?

A: HCPL-0900-500E is listed as a parametric equivalent for single-channel applications only. It is not a substitute for the 2-channel HCPL-0931-500. Use only when 1-channel isolation is required.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. ROHS3-compliant parts (HCPL-0931-500E, IL series, ISO7321 series) are required for products sold in regulated markets. The original HCPL-0931-500 is non-compliant and unsuitable for new designs in these regions.

Q: Can ISO7321 series parts be used in high-speed applications?

A: No. ISO7321 series parts are limited to 25Mbps data rate, making them unsuitable for applications requiring 110MBd operation. These parts are appropriate only for low-speed isolation requirements where the higher isolation voltage (3000Vrms) provides additional safety margin.

Q: What is the significance of Common Mode Transient Immunity (CMTI) in isolator selection?

A: CMTI specifies the maximum rate of voltage change across the isolation barrier that the device can tolerate without data corruption. IL 712-3E provides 100kV/µs CMTI, significantly exceeding the 15kV/µs of the original part and other substitutes. This enhanced specification is beneficial in high-noise environments with rapid voltage transients.

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