EL2531 Equivalent & Substitute Parts

Part Overview

The EL2531 is a 2-channel optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides 5000Vrms isolation and is designed for through-hole mounting in 8-DIP packaging. The part is currently active in production with substantial inventory availability (53,664 pcs). Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same product category, enabling direct component replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
Number of Channels	2
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Output Type	Transistor
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Input Type	DC
Operating Temperature Range	-40°C ~ 100°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the EL2531 are qualified based on strict parametric equivalence in the following categories:

Electrical Parameters: Number of channels (2), isolation voltage (5000Vrms), current transfer ratio range (19% to 50% @ 16mA), output type (transistor), maximum output voltage (20V), output current per channel (8mA), input type (DC), and operating temperature range (-40°C ~ 100°C) must be identical.

Mechanical Parameters: Mounting type (through hole), package type (8-DIP with 0.300" / 7.62mm pitch), and supplier device package designation must match exactly.

Compliance Parameters: RoHS3 compliance status is required for all substitutes.

The substitute parts HCPL2531M and HCPL2531VM, both manufactured by onsemi, meet all specified electrical and mechanical parameters. Minor variations in turn-on/turn-off timing (250ns/260ns versus 350ns/300ns) remain within acceptable operational tolerances for this component category and do not disqualify substitution.

Parameter Comparison

Parameter	EL2531 (Everlight)	HCPL2531M (onsemi)	HCPL2531VM (onsemi)
Manufacturer	Everlight Electronics Co Ltd	onsemi	onsemi
Number of Channels	2	2	2
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	19% @ 16mA	19% @ 16mA	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA	50% @ 16mA	50% @ 16mA
Turn On Time (Typ)	350ns	250ns	250ns
Turn Off Time (Typ)	300ns	260ns	260ns
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	20V	20V	20V
Current - Output / Channel	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.45V	1.45V	1.45V
Current - DC Forward (If) (Max)	25mA	25mA	25mA
Operating Temperature	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three optoisolator parts—EL2531, HCPL2531M, and HCPL2531VM—maintain active production status and full RoHS3 compliance. Selection between these components is based on availability and supply chain requirements rather than functional differences.

EL2531 (Everlight Electronics): Primary choice with highest inventory (53,664 pcs). Suitable for applications requiring immediate availability and established Everlight supply relationships.

HCPL2531M (onsemi): Direct parametric equivalent with 12,300 pcs in stock. Appropriate for designs requiring onsemi component qualification or when Everlight supply is constrained.

HCPL2531VM (onsemi): Direct parametric equivalent with 1,998 pcs in stock. Suitable for low-volume applications or as secondary source when primary options are unavailable.

All three parts are suitable for direct substitution in 2-channel, 5000Vrms isolation applications requiring 8-DIP through-hole mounting. No circuit redesign or board layout modification is required when switching between these components.

Frequently Asked Questions (FAQ)

Q: Can HCPL2531M or HCPL2531VM be used as direct replacements for EL2531 without circuit modification?

A: Yes. Both onsemi parts are parametric equivalents with identical electrical specifications for channel count, isolation voltage, current transfer ratio, output voltage, output current, and operating temperature range. The 8-DIP through-hole package dimensions are identical, enabling direct pin-for-pin substitution on existing PCBs.

Q: What is the significance of the timing differences (350ns/300ns vs. 250ns/260ns)?

A: The EL2531 has slightly longer turn-on and turn-off times compared to the onsemi substitutes. Both timing profiles are within acceptable operational ranges for this optoisolator category. Applications with strict timing requirements should verify that the faster switching times of HCPL2531M and HCPL2531VM do not introduce unintended circuit behavior.

Q: Are there any compliance or certification differences between these parts?

A: All three parts are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications. The onsemi parts carry REACH Unaffected status, while the EL2531 specifies Moisture Sensitivity Level 1 (Unlimited). These differences do not affect functional substitution.

Q: Which part should be selected for new designs?

A: Selection should be based on supply chain strategy and inventory availability. All three parts are active and suitable for production designs. Designs requiring long-term supply security should evaluate both Everlight and onsemi sources to establish dual-source qualification.

Q: Is the 8-DIP package compatible with automated assembly equipment?

A: Yes. All three parts use standard 8-DIP (0.300", 7.62mm) through-hole packaging, which is compatible with conventional through-hole insertion equipment and hand assembly processes.

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