EC103MRP Equivalent & Substitute Parts

Part Overview

The EC103MRP is a 600V, 800mA sensitive gate SCR (Silicon Controlled Rectifier) manufactured by Littelfuse Inc. in a through-hole TO-92 package. This thyristor is designed for applications requiring controlled rectification and switching at moderate voltage and current levels. The part is active and in production with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the original EC103MRP becomes unavailable, when alternative packaging formats are required, or when design optimization calls for enhanced electrical characteristics within the same functional category.

Key Parameters

Parameter	EC103MRP Value	Unit
Voltage - Off State	600	V
Voltage - Gate Trigger (Vgt) Max	800	mV
Current - Gate Trigger (Igt) Max	200	µA
Voltage - On State (Vtm) Max	1.7	V
Current - On State (It RMS) Max	800	mA
Current - Hold (Ih) Max	5	mA
Operating Temperature Range	-40 to 110	°C
SCR Type	Sensitive Gate	—
Package / Case	TO-92-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution eligibility for the EC103MRP is determined by the following critical parameters:

Voltage Rating (Off State): Must equal 600V
SCR Type: Must be Sensitive Gate
Package / Case: Must be TO-92-3 (TO-226-3)
Mounting Type: Must be Through Hole
Current - On State (It RMS): Must support minimum 800mA
Gate Trigger Voltage (Vgt): Must not exceed 800mV
Operating Temperature: Must support at least -40°C to 110°C range
RoHS Status: Must maintain ROHS3 compliance

All substitute parts listed meet these core requirements. Variations in gate trigger current (Igt), on-state voltage (Vtm), and surge current ratings represent acceptable performance differences within the sensitive gate SCR category.

Parameter Comparison

Parameter	EC103MRP	P0111MA 1AA3	P0118MA 2AL3	X00619MA5AL2	X0202MA 1BA2	X0202MA 2BL2	X0205MA 2BL2
Voltage - Off State (V)	600	600	600	600	600	600	600
Voltage - Gate Trigger Max (mV)	800	800	800	800	800	800	800
Current - Gate Trigger Max (µA)	200	25	5	200	200	200	50
Voltage - On State Max (V)	1.7	1.95	1.95	1.35	1.45	1.45	1.45
Current - On State (It RMS) Max (mA)	800	800	800	800	1250	1250	1250
Current - Hold Max (mA)	5	5	5	5	5	5	5
Operating Temperature Range (°C)	-40 to 110	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain active product status and full ROHS3 compliance, meeting regulatory requirements equivalent to the EC103MRP.

Direct Current Rating Match (800mA RMS): P0111MA 1AA3, P0118MA 2AL3, and X00619MA5AL2 maintain the exact 800mA RMS current rating of the EC103MRP. These parts are suitable for direct replacement in applications with fixed current requirements.

Enhanced Current Rating (1.25A RMS): X0202MA 1BA2, X0202MA 2BL2, and X0205MA 2BL2 provide 1.25A RMS capability, offering higher current headroom within the same 600V voltage class and TO-92-3 package. These are applicable when design margins or future current scaling are considerations.

Temperature Range Extension: All substitute parts support -40°C to 125°C operating range, extending the upper temperature limit by 15°C compared to the EC103MRP's -40°C to 110°C range.

Packaging Format Availability: Substitute parts are available in Bulk, Cut Tape (CT), and Tape & Reel (TR) formats, accommodating different procurement and assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can P0111MA 1AA3 replace EC103MRP in all applications? A: P0111MA 1AA3 meets all core substitution criteria: 600V rating, sensitive gate type, TO-92-3 package, 800mA RMS current, and -40°C to 125°C operating range. It is electrically compatible for direct replacement.

Q: What is the difference between X0202MA 1BA2 and X0202MA 2BL2? A: Both parts are electrically identical with 1.25A RMS current rating and 600V voltage class. The difference is packaging format: X0202MA 1BA2 is supplied in Bulk, while X0202MA 2BL2 is supplied in Cut Tape (CT).

Q: Why do some substitutes have lower gate trigger current (Igt)? A: P0118MA 2AL3 (5µA) and P0111MA 1AA3 (25µA) have lower Igt values than the EC103MRP (200µA). Lower gate trigger current indicates higher gate sensitivity, which is acceptable within the sensitive gate SCR category and does not prevent substitution.

Q: Are the higher current-rated parts (1.25A) backward compatible? A: X0202MA 1BA2, X0202MA 2BL2, and X0205MA 2BL2 with 1.25A RMS rating are backward compatible in applications designed for 800mA RMS. The higher rating provides additional margin without affecting circuit operation.

Q: Does the extended temperature range (-40°C to 125°C) affect substitution suitability? A: The extended upper temperature limit of substitute parts does not prevent substitution in applications limited to -40°C to 110°C. All parts maintain performance within the EC103MRP's original temperature envelope.

Q: What packaging considerations apply when selecting a substitute? A: Packaging format (Bulk, Cut Tape, Tape & Reel) affects procurement and assembly processes but does not impact electrical performance. Select based on your assembly workflow and inventory management requirements.

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