EC103M SCR 600V 800mA TO-92 Equivalent & Substitute Parts

Part Overview

The EC103M is a Littelfuse sensitive gate silicon controlled rectifier (SCR) rated for 600V off-state voltage and 800mA on-state current in a through-hole TO-92 package. This component is active and in production. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility to support design flexibility, inventory optimization, and supply chain continuity.

Key Parameters

Parameter	EC103M Value
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
SCR Type	Sensitive Gate
Operating Temperature Range	-40°C ~ 110°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the EC103M is determined by the following criteria:

Primary Matching Parameters:

Voltage - Off State: 600V minimum
SCR Type: Sensitive Gate
Mounting Type: Through Hole
Package / Case: TO-92-3 compatible
Gate Trigger Voltage (Vgt): 800 mV maximum
Current - Gate Trigger (Igt): 200 µA maximum
Current - Hold (Ih): 5 mA maximum

Secondary Compatibility Factors:

On-state voltage (Vtm) and current ratings must not exceed application requirements
Operating temperature range must encompass the intended application environment
RoHS and REACH compliance status must meet regulatory requirements

Substitute parts are grouped into two categories:

Direct Equivalents (600V, 800mA class): Parts with matching 600V off-state voltage and 800mA on-state current ratings, identical gate trigger specifications, and compatible thermal performance.

Higher Current Capability Substitutes (600V, 1.25A class): Parts with 600V off-state voltage but higher on-state current ratings (1.25A), suitable for applications requiring additional current margin while maintaining voltage and gate trigger compatibility.

Higher Voltage Substitute (800V class): Parts with elevated off-state voltage rating, applicable in circuits requiring enhanced voltage headroom.

Parameter Comparison

Part Number	Manufacturer	Voltage - Off State	Vgt (Max)	Igt (Max)	Vtm (Max)	It (RMS) (Max)	Ih (Max)	Operating Temp	Package	RoHS Status
EC103M	Littelfuse	600 V	800 mV	200 µA	1.7 V	800 mA	5 mA	-40°C ~ 110°C	TO-92-3	ROHS3
P0111MA 1AA3	STMicroelectronics	600 V	800 mV	25 µA	1.95 V	800 mA	5 mA	-40°C ~ 125°C	TO-92-3	ROHS3
P0118MA 2AL3	STMicroelectronics	600 V	800 mV	5 µA	1.95 V	800 mA	5 mA	-40°C ~ 125°C	TO-92-3	ROHS3
SX011U	SMC Diode Solutions	800 V	800 mV	200 µA	1.7 V	1 A	4 mA	-40°C ~ 150°C	TO-92-3	ROHS3
X00602MA 1AA2	STMicroelectronics	600 V	800 mV	200 µA	1.35 V	800 mA	5 mA	-40°C ~ 125°C	TO-92-3	ROHS3
X0202MA 1BA2	STMicroelectronics	600 V	800 mV	200 µA	1.45 V	1.25 A	5 mA	-40°C ~ 125°C	TO-92-3	ROHS3
X0202MA 2BL2	STMicroelectronics	600 V	800 mV	200 µA	1.45 V	1.25 A	5 mA	-40°C ~ 125°C	TO-92-3	ROHS3
X0205MA 1BA2	STMicroelectronics	600 V	800 mV	50 µA	1.45 V	1.25 A	5 mA	-40°C ~ 125°C	TO-92-3	ROHS3
X0205MA 2BL2	STMicroelectronics	600 V	800 mV	50 µA	1.45 V	1.25 A	5 mA	-40°C ~ 125°C	TO-92-3	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Recommended for Pin-Compatible Replacement):

P0111MA 1AA3, P0118MA 2AL3, and X00602MA 1AA2 maintain 600V off-state voltage and 800mA on-state current ratings matching the EC103M. All three are ROHS3 compliant and active products. P0118MA 2AL3 is supplied in Cut Tape (CT) packaging; P0111MA 1AA3 and X00602MA 1AA2 are supplied in Bulk. Extended operating temperature range (-40°C ~ 125°C) in P0111MA 1AA3 and X00602MA 1AA2 provides thermal margin beyond the EC103M specification (-40°C ~ 110°C).

Higher Current Capability Substitutes (For Increased Current Margin):

X0202MA 1BA2, X0202MA 2BL2, X0205MA 1BA2, and X0205MA 2BL2 provide 1.25A on-state current rating while maintaining 600V off-state voltage and compatible gate trigger specifications. These parts are suitable for applications requiring additional current headroom. X0202MA and X0205MA variants differ in packaging (Bulk vs. Cut Tape) and gate trigger current specifications. All are ROHS3 compliant and active products with -40°C ~ 125°C operating temperature range.

Higher Voltage Substitute (For Enhanced Voltage Headroom):

SX011U provides 800V off-state voltage with 1A on-state current capability, matching gate trigger voltage and on-state voltage characteristics of the EC103M. This part is suitable for circuits requiring elevated voltage margin. SX011U is ROHS3 compliant and active, with extended operating temperature range (-40°C ~ 150°C). REACH status is listed as Affected for SX011U; all other substitutes are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can P0111MA 1AA3 replace EC103M in existing designs?

A: Yes. P0111MA 1AA3 matches the 600V off-state voltage, 800mV gate trigger voltage, and 800mA on-state current rating of EC103M. Both use TO-92-3 packaging and are ROHS3 compliant. The lower gate trigger current (25 µA vs. 200 µA) and extended operating temperature range (-40°C ~ 125°C) provide additional design margin.

Q: What is the difference between X0202MA 1BA2 and X0202MA 2BL2?

A: Both parts are electrically identical with 600V off-state voltage, 800mV gate trigger voltage, 200 µA gate trigger current, and 1.25A on-state current rating. The primary difference is packaging: X0202MA 1BA2 is supplied in Bulk; X0202MA 2BL2 is supplied in Cut Tape (CT) with formed leads. Select based on assembly process requirements.

Q: When should SX011U be selected instead of direct equivalents?

A: SX011U is appropriate for applications requiring 800V off-state voltage headroom or extended operating temperature range (-40°C ~ 150°C). The 1A on-state current rating provides additional current margin. Note that SX011U has REACH Affected status, whereas EC103M and other STMicroelectronics substitutes are REACH Unaffected.

Q: Are all substitute parts compatible with the EC103M footprint?

A: Yes. All substitute parts use TO-92-3 (TO-226AA) through-hole packaging, maintaining mechanical and electrical pin compatibility with EC103M. Verify lead spacing and mounting hole diameter in the specific PCB design.

Q: What is the significance of gate trigger current (Igt) differences among substitutes?

A: Gate trigger current determines the minimum gate current required to switch the SCR into conduction. Lower Igt values (e.g., 5 µA in P0118MA 2AL3) reduce gate drive circuit complexity and power consumption. Higher Igt values (e.g., 200 µA in EC103M and X00602MA 1AA2) require more robust gate drive circuits but may offer improved noise immunity in certain applications. Select based on gate drive circuit design.

Q: Can higher current-rated parts (1.25A) be used in 800mA applications?

A: Yes. Higher current-rated parts (X0202MA and X0205MA series) are suitable for applications designed for 800mA operation. The higher current rating provides design margin and thermal headroom. Verify that on-state voltage (Vtm) and thermal dissipation characteristics are acceptable for the specific application.

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