EC103B2AP Equivalent & Substitute Parts

Part Overview

The EC103B2AP is a 200 V, 800 mA sensitive gate SCR manufactured by Littelfuse Inc. in TO-92 through-hole packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Substitute parts are selected based on matching electrical characteristics, gate sensitivity parameters, thermal operating range, and mechanical compatibility while accommodating higher voltage ratings where applicable.

Key Parameters

Parameter	EC103B2AP
Voltage - Off State	200 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	50 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	-40°C ~ 110°C
Mounting Type	Through Hole
Package / Case	TO-92-3
SCR Type	Sensitive Gate
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the EC103B2AP is determined by the following critical parameters:

SCR Type: All substitutes must be sensitive gate SCR devices
Mounting Type & Package: Through-hole TO-92 or TO-92-3 configuration required
Gate Trigger Voltage (Vgt): Maximum 800 mV for gate sensitivity compatibility
Current - On State (It (RMS)): 800 mA rating maintained across all substitutes
Current - Hold (Ih): 5 mA maximum for consistent holding characteristics
Operating Temperature Range: Minimum -40°C to 110°C coverage
RoHS Compliance: ROHS3 compliant status required

Substitute parts are grouped into two categories:

Upgrade Substitutes (Higher voltage rating, same gate sensitivity):

EC103D2AP and EC103D2 (400 V rating)
EC103M2AP (600 V rating)

Cross-Manufacturer Substitutes (STMicroelectronics alternative):

P0111DA 1AA3 and P0111DA 5AL3 (400 V rating, STMicroelectronics manufacture)

All substitutes maintain the 800 mA RMS current rating, sensitive gate operation, and through-hole TO-92 packaging. Higher voltage ratings provide design margin for applications originally specified at 200 V.

Parameter Comparison

Parameter	EC103B2AP	EC103D2AP	EC103M2AP	EC103D2	P0111DA 1AA3	P0111DA 5AL3
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics	STMicroelectronics
Voltage - Off State	200 V	400 V	600 V	400 V	400 V	400 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	50 µA	50 µA	50 µA	50 µA	25 µA	25 µA
Voltage - On State (Vtm) (Max)	1.7 V	1.7 V	1.7 V	1.7 V	1.95 V	1.95 V
Current - On State (It (RMS)) (Max)	800 mA	800 mA	800 mA	800 mA	800 mA	800 mA
Current - Hold (Ih) (Max)	5 mA	5 mA	5 mA	5 mA	5 mA	5 mA
Operating Temperature	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Littelfuse EC103 Series Substitutes (EC103D2AP, EC103M2AP, EC103D2): These parts maintain identical gate sensitivity, on-state voltage, and holding current characteristics to the EC103B2AP while offering higher voltage ratings. All are active products with ROHS3 compliance and continuous manufacturing support. EC103D2AP and EC103M2AP are available in standard packaging formats (Tape & Box), while EC103D2 is supplied in bulk. Selection between 400 V (EC103D2AP, EC103D2) and 600 V (EC103M2AP) ratings depends on application voltage requirements.

STMicroelectronics P0111DA Substitutes (P0111DA 1AA3, P0111DA 5AL3): These cross-manufacturer alternatives provide 400 V rating with improved gate trigger current (25 µA versus 50 µA) and extended operating temperature range (-40°C to 125°C). On-state voltage is slightly higher at 1.95 V maximum. Both variants are active products with ROHS3 compliance. P0111DA 1AA3 is supplied in bulk packaging, while P0111DA 5AL3 is available in cut tape format. These parts are suitable for applications where lower gate drive current is beneficial.

All substitute parts maintain through-hole TO-92-3 mechanical compatibility and 800 mA RMS current handling capacity. Selection should be based on application voltage requirements, gate drive circuit capabilities, and packaging preferences.

Frequently Asked Questions (FAQ)

Q: Can EC103D2AP directly replace EC103B2AP in a 200 V application? A: Yes. EC103D2AP is rated for 400 V off-state voltage, which exceeds the 200 V requirement of the original design. All other electrical parameters—gate trigger voltage, on-state voltage, holding current, and RMS current rating—are identical. The higher voltage rating provides design margin without affecting circuit operation.

Q: What is the difference between EC103D2AP and EC103D2? A: Both parts are identical in electrical specifications and package type (TO-92-3). The difference is packaging format: EC103D2AP is supplied in Tape & Box (TB) format, while EC103D2 is supplied in bulk. Selection depends on procurement and assembly requirements.

Q: Why do P0111DA parts have lower gate trigger current (25 µA vs. 50 µA)? A: The P0111DA series from STMicroelectronics is designed with improved gate sensitivity. The lower 25 µA gate trigger current requirement reduces gate drive circuit complexity and power consumption. This is a design advantage for applications with limited gate drive capability.

Q: Are P0111DA parts compatible with EC103 series circuits? A: P0111DA parts are mechanically and functionally compatible in TO-92-3 through-hole applications. However, the lower gate trigger current and slightly higher on-state voltage (1.95 V vs. 1.7 V) should be evaluated for specific circuit requirements. Gate drive circuits designed for 50 µA will operate reliably with 25 µA gate trigger current.

Q: What is the temperature operating range difference between Littelfuse and STMicroelectronics parts? A: Littelfuse EC103 series parts operate from -40°C to 110°C. STMicroelectronics P0111DA parts extend the upper limit to 125°C. For applications requiring operation above 110°C, P0111DA substitutes provide additional thermal margin.

Q: Can I use EC103M2AP (600 V) in place of EC103B2AP (200 V)? A: Yes. EC103M2AP is electrically and mechanically compatible with identical gate sensitivity and current ratings. The 600 V rating provides maximum design margin for applications with voltage transients or future design modifications. No circuit changes are required.

Q: What packaging options are available for substitutes? A: Littelfuse EC103D2AP is available in Tape & Box format for automated assembly. EC103D2 is supplied in bulk for manual assembly or reel processing. STMicroelectronics P0111DA 1AA3 is bulk packaged, while P0111DA 5AL3 is cut tape format. Selection depends on assembly process requirements.

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