EC103B Equivalent & Substitute Parts

Part Overview

The EC103B is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 200 V off-state voltage and 800 mA on-state current in a TO-92 through-hole package. Manufactured by Littelfuse, this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts with enhanced electrical ratings and active product status are available to support continued system design and production requirements.

Key Parameters

Parameter	EC103B Value
Voltage - Off State	200 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	-40°C ~ 110°C
Package / Case	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the EC103B are qualified based on the following criteria:

Electrical Compatibility Parameters:

SCR Type: Sensitive Gate (required match)
Mounting Type: Through Hole (required match)
Package / Case: TO-92-3 (TO-226AA) (required match)
Voltage - Gate Trigger (Vgt) (Max): 800 mV (required match)
Current - Hold (Ih) (Max): 5 mA (required match)
Operating Temperature Range: Must encompass or exceed -40°C ~ 110°C

Allowable Parameter Variations:

Voltage - Off State: May be equal to or greater than 200 V
Current - On State (It (RMS)) (Max): May be equal to or greater than 800 mA
Current - Gate Trigger (Igt) (Max): May be equal to or less than 200 µA
Voltage - On State (Vtm) (Max): May be equal to or less than 1.7 V

Compliance Requirements:

RoHS3 Compliant (required)
Product Status: Active preferred for continued availability

The EC103D, EC103M, and X0205MA 1BA2 meet these substitution criteria with enhanced voltage ratings and active product status.

Parameter Comparison

Parameter	EC103B	EC103D	EC103M	X0205MA 1BA2
Manufacturer	Littelfuse	Littelfuse Inc.	Littelfuse	STMicroelectronics
Product Status	Obsolete	Active	Active	Active
Voltage - Off State	200 V	400 V	600 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA	200 µA	200 µA	50 µA
Voltage - On State (Vtm) (Max)	1.7 V	1.7 V	1.7 V	1.45 V
Current - On State (It (RMS)) (Max)	800 mA	800 mA	800 mA	1.25 A
Current - Hold (Ih) (Max)	5 mA	5 mA	5 mA	5 mA
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate
Operating Temperature	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 125°C
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

EC103D (Littelfuse): Active product status with 400 V off-state voltage rating. Maintains identical gate trigger voltage, on-state voltage, and hold current specifications. Suitable for applications requiring voltage margin above 200 V while preserving original electrical characteristics. ROHS3 compliant with unlimited moisture sensitivity level.

EC103M (Littelfuse): Active product status with 600 V off-state voltage rating. Maintains identical gate trigger voltage, on-state voltage, and hold current specifications. Provides maximum voltage headroom within the Littelfuse EC103 series. ROHS3 compliant with unlimited moisture sensitivity level.

X0205MA 1BA2 (STMicroelectronics): Active product status with 600 V off-state voltage rating and 1.25 A on-state current capability. Offers reduced gate trigger current (50 µA versus 200 µA) and reduced on-state voltage (1.45 V versus 1.7 V), resulting in lower gate drive power requirements and reduced conduction losses. Extended operating temperature range to 125°C. ROHS3 compliant with unlimited moisture sensitivity level. Manufacturer-recommended substitute.

Frequently Asked Questions (FAQ)

Q: Can EC103D, EC103M, or X0205MA 1BA2 be used as direct replacements for EC103B?

A: Yes, all three parts are direct pin-compatible substitutes in TO-92-3 packages. They maintain the same gate trigger voltage (800 mV), hold current (5 mA), and sensitive gate SCR type. Higher voltage ratings provide design margin without affecting gate drive requirements or hold current behavior.

Q: What is the primary advantage of X0205MA 1BA2 over EC103D and EC103M?

A: X0205MA 1BA2 provides lower gate trigger current (50 µA) and lower on-state voltage (1.45 V), reducing gate drive power dissipation and conduction losses. It also offers extended operating temperature range to 125°C and higher on-state current capability (1.25 A).

Q: Are there any electrical parameter differences that would prevent substitution?

A: No. All substitute parts maintain the critical gate trigger voltage of 800 mV and hold current of 5 mA. Differences in off-state voltage, on-state current, and gate trigger current represent improvements or expanded capability ranges, not incompatibilities.

Q: Why is EC103B classified as obsolete?

A: EC103B is listed as obsolete by the manufacturer. EC103D and EC103M are active products from the same manufacturer with enhanced voltage ratings. X0205MA 1BA2 is an active product from STMicroelectronics offering superior electrical performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. EC103B, EC103D, EC103M, and X0205MA 1BA2 are all ROHS3 compliant with moisture sensitivity level 1 (unlimited).

Q: What is the difference between EC103D and EC103M?

A: EC103D is rated for 400 V off-state voltage, while EC103M is rated for 600 V off-state voltage. Both maintain identical gate trigger voltage, on-state voltage, and hold current specifications. Selection depends on application voltage requirements.

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