EL1018-G Optoisolator Equivalent & Substitute Parts

Part Overview

The EL1018-G is a 5000Vrms isolation optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel device operates in the 4-SOP (2.54mm) surface mount package and is classified as Active product status. The EL1018-G provides galvanic isolation for signal transmission in industrial control, power management, and communication applications requiring high voltage isolation ratings.

Substitute parts are identified based on matching electrical isolation specifications, output configuration, and mechanical compatibility within the optoisolator transistor output category. Alternative models from Vishay Semiconductor Opto Division provide equivalent isolation voltage ratings and package form factors while offering variations in current transfer ratio performance grades.

Key Parameters

Parameter	EL1018-G Value	Unit	Substitution Relevance
Voltage - Isolation	5000	Vrms	Critical - Must match for isolation requirement
Number of Channels	1	Channel	Critical - Determines circuit configuration
Output Type	Transistor	Type	Critical - Defines output stage topology
Package / Case	4-SMD, Gull Wing	Form Factor	Critical - Determines PCB compatibility
Supplier Device Package	4-SOP (2.54mm)	Package Code	Critical - Physical footprint specification
Current Transfer Ratio (Min)	130%	@ 5mA	Important - Affects circuit gain and design margin
Current Transfer Ratio (Max)	260%	@ 5mA	Important - Defines performance grade
Voltage - Output (Max)	80	V	Important - Output stage voltage rating
Current - Output / Channel	50	mA	Important - Load driving capability
Operating Temperature	-55 to 110	°C	Important - Environmental operating range
Mounting Type	Surface Mount	Type	Critical - Assembly process compatibility
RoHS Status	ROHS3 Compliant	Compliance	Important - Regulatory requirement

Substitute Part Grouping Explanation

Substitute optoisolators for the EL1018-G are selected based on the following mandatory matching criteria:

Critical Matching Parameters:

Voltage - Isolation: 5000Vrms (all substitutes maintain this specification)
Number of Channels: 1 (single-channel configuration)
Output Type: Transistor (phototransistor output stage)
Package / Case: 4-SMD, Gull Wing (surface mount form factor)
Supplier Device Package: 4-SOP or 4-SOP (2.54mm) (mechanical footprint)
Mounting Type: Surface Mount (PCB assembly compatibility)

Performance Grade Differentiation: Substitute parts are grouped by Current Transfer Ratio (CTR) performance at specified input current levels. The EL1018-G operates at 130%-260% CTR @ 5mA. Vishay TCLT series devices provide multiple CTR grades (TCLT1000 through TCLT1009) enabling selection based on circuit gain requirements. VOL617A variants offer alternative CTR ranges with modified output voltage ratings (80V maximum).

Secondary Compatibility Parameters: All substitutes maintain 50mA output current capability, 300mV Vce saturation, and ROHS3 compliance. Operating temperature ranges vary between -55°C to 100°C (Vishay TCLT/VOL617A) and -55°C to 110°C (EL1018-G and VOL617A-1X001T/2X001T), affecting thermal design considerations.

Parameter Comparison

Parameter	EL1018-G	TCLT1000	TCLT1002	TCLT1003	TCLT1005	TCLT1006	TCLT1007	TCLT1008	TCLT1009	VOL617A-1X001T	VOL617A-2X001T
Manufacturer	Everlight	Vishay	Vishay	Vishay	Vishay	Vishay	Vishay	Vishay	Vishay	Vishay	Vishay
Voltage - Isolation (Vrms)	5000	5000	5000	5000	5000	5000	5000	5000	5000	5000	5000
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
CTR Min @ 5mA (%)	130	50	N/A	N/A	50	100	80	130	200	40	63
CTR Max @ 5mA (%)	260	600	N/A	N/A	150	300	160	260	400	80	125
CTR Min @ 10mA (%)	N/A	N/A	63	100	N/A	N/A	N/A	N/A	N/A	N/A	N/A
CTR Max @ 10mA (%)	N/A	N/A	125	200	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Turn On Time (µs)	4	6	6	6	6	6	6	6	6	6	6
Turn Off Time (µs)	3	5	5	5	5	5	5	5	5	5.5	5.5
Voltage - Output (Max) (V)	80	70	70	70	70	70	70	70	70	80	80
Current - Output / Channel (mA)	50	50	50	50	50	50	50	50	50	50	50
Vce Saturation (Max) (mV)	300	300	300	300	300	300	300	300	300	400	400
Operating Temperature (°C)	-55 to 110	-55 to 100	-55 to 100	-55 to 100	-55 to 100	-55 to 100	-55 to 100	-55 to 100	-55 to 100	-55 to 110	-55 to 110
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Functional Equivalent: TCLT1008 from Vishay Semiconductor Opto Division provides the closest electrical match to EL1018-G. Both devices specify 130%-260% CTR @ 5mA, identical output current rating of 50mA, and matching 300mV Vce saturation. TCLT1008 maintains 5000Vrms isolation, single-channel transistor output, and 4-SOP package compatibility. Both are Active product status with ROHS3 compliance and MSL 1 rating. The primary difference is operating temperature range: TCLT1008 operates -55°C to 100°C versus EL1018-G at -55°C to 110°C. For applications within -55°C to 100°C operating envelope, TCLT1008 is a direct substitute.

Alternative Selections by Performance Grade:

TCLT1006 (100%-300% CTR @ 5mA) accommodates applications requiring higher gain margin than EL1018-G nominal specification. TCLT1007 (80%-160% CTR @ 5mA) suits designs with lower gain requirements. TCLT1000 (50%-600% CTR @ 5mA) and TCLT1009 (200%-400% CTR @ 5mA) provide extended performance ranges for specialized circuit topologies.

Extended Temperature Applications: VOL617A-1X001T and VOL617A-2X001T maintain -55°C to 110°C operating range matching EL1018-G thermal specification. VOL617A-2X001T (63%-125% CTR @ 5mA) provides closest CTR alignment within extended temperature range. VOL617A devices specify 80V maximum output voltage and 400mV Vce saturation, requiring circuit validation for applications sensitive to these parameters.

Compliance and Availability: All substitute parts maintain ROHS3 compliance, MSL 1 rating, and Active product status. Inventory availability ranges from 2,200 units (VOL617A-1X001T) to 143,200 units (TCLT1002), supporting volume production requirements.

Frequently Asked Questions (FAQ)

Q: Can TCLT1008 directly replace EL1018-G in all applications?

A: TCLT1008 provides electrical equivalence within the -55°C to 100°C operating range. Applications requiring operation above 100°C must use VOL617A variants or confirm EL1018-G availability. Both devices share 5000Vrms isolation, 4-SOP package, 50mA output current, and 130%-260% CTR specification.

Q: What is the difference between TCLT1000 and TCLT1008?

A: Both devices maintain 5000Vrms isolation and 4-SOP package. TCLT1000 specifies 50%-600% CTR @ 5mA with broader performance tolerance. TCLT1008 specifies 130%-260% CTR @ 5mA, matching EL1018-G nominal range. TCLT1000 suits applications requiring lower minimum gain; TCLT1008 suits designs matching EL1018-G specifications.

Q: Are VOL617A parts compatible with TCLT series in the same circuit?

A: VOL617A and TCLT series share 5000Vrms isolation, 4-SOP package, and 50mA output current. VOL617A specifies 80V maximum output voltage and 400mV Vce saturation versus TCLT 70V and 300mV respectively. Circuit designs must accommodate these parameter differences. Both are ROHS3 compliant and MSL 1 rated.

Q: What is the impact of different CTR specifications on circuit design?

A: Current Transfer Ratio determines the output collector current relative to input LED current. Higher CTR (TCLT1009 at 200%-400%) requires lower input drive current for equivalent output. Lower CTR (TCLT1000 at 50%-600% range minimum) requires higher input drive current. Circuit input impedance and output load impedance must be evaluated against selected CTR grade.

Q: Can TCLT1002 or TCLT1003 substitute for EL1018-G?

A: TCLT1002 and TCLT1003 specify CTR @ 10mA rather than @ 5mA, making direct comparison to EL1018-G (CTR @ 5mA) non-equivalent. TCLT1002 (63%-125% @ 10mA) and TCLT1003 (100%-200% @ 10mA) require circuit redesign to accommodate different input current levels. These parts are suitable only when circuit input current can be adjusted to 10mA specification.

Q: What packaging options are available for these substitutes?

A: All listed substitutes use 4-SOP (2.54mm) surface mount package with 4-SMD Gull Wing configuration. Packaging format variations include Tape & Reel (TR) for TCLT1000, TCLT1005, TCLT1006, TCLT1007, TCLT1008, and VOL617A variants; Cut Tape (CT) & Digi-Reel for TCLT1002, TCLT1003, and TCLT1009. PCB footprint compatibility is identical across all variants.

Q: How do operating temperature ranges affect substitution decisions?

A: EL1018-G and VOL617A variants operate -55°C to 110°C. TCLT series operates -55°C to 100°C. Applications requiring operation above 100°C must use EL1018-G or VOL617A parts. Applications within -55°C to 100°C can use any listed substitute. Thermal design margins must account for specified operating ranges.

Q: Are all substitutes ROHS3 compliant?

A: All listed substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching EL1018-G specifications. All parts are Active product status, ensuring continued availability and manufacturing support.

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