EC103D2 SCR 400V 800mA TO-92 Equivalent & Substitute Parts

Part Overview

The EC103D2 is a sensitive gate silicon controlled rectifier (SCR) rated for 400V off-state voltage and 800mA RMS on-state current in a through-hole TO-92 package. Manufactured by Littelfuse Inc., this thyristor is designed for AC switching and control applications requiring low gate trigger current and voltage characteristics.

The EC103D2 maintains active product status with 907 units in stock. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the TO-92 package family, enabling circuit designers to source alternative components when primary availability is constrained or when design flexibility is required.

Key Parameters

Parameter	EC103D2 Value	Unit
Voltage - Off State	400	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 Range	-40 to 110	°C
Package / Case	TO-226-3, TO-92-3	—
SCR Type	Sensitive Gate	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the EC103D2 is determined by the following critical parameters:

Off-state voltage rating: 400V (all substitutes match)
Gate trigger voltage (Vgt): 800mV maximum (all substitutes match)
On-state RMS current (It RMS): 800mA maximum (all substitutes match)
Package type: TO-92-3 through-hole configuration (all substitutes match)
SCR type: Sensitive gate (all substitutes match)
Temperature range: Minimum -40°C to +110°C operation (substitutes extend to +125°C)

The identified substitute parts are manufactured by STMicroelectronics and share identical voltage and current ratings with the EC103D2. Variations exist in gate trigger current (Igt), on-state voltage (Vtm), and product lifecycle status. These variations remain within acceptable engineering tolerances for direct circuit substitution in applications where the EC103D2 specifications are the design baseline.

Parameter Comparison

Parameter	EC103D2	P0102DA 1AA3	P0102DA 2AL3	P0102DA 5AL3	P0118DA 5AL3	XL0840
Manufacturer	Littelfuse Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Voltage - Off State (V)	400	400	400	400	400	400
Voltage - Gate Trigger Max (mV)	800	800	800	800	800	800
Current - Gate Trigger Max (µA)	50	200	200	200	5	200
Voltage - On State Max (V)	1.7	1.95	1.95	1.95	1.95	1.95
Current - On State RMS Max (mA)	800	800	800	800	800	800
Current - Hold Max (mA)	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
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Product Status	Active	Active	Active	Active	Obsolete	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status)

The P0102DA series from STMicroelectronics represents the recommended substitute family for the EC103D2. All three variants—P0102DA 1AA3 (Bulk), P0102DA 2AL3 (Cut Tape), and P0102DA 5AL3 (Cut Tape, Formed Leads)—maintain active product status with ROHS3 compliance and extended operating temperature to 125°C. These parts are electrically equivalent to the EC103D2 across all critical switching parameters. Selection among the three variants depends on packaging and lead configuration requirements for your assembly process.

Alternative Substitute (Last Time Buy Status)

The XL0840 from STMicroelectronics is functionally equivalent to the EC103D2 but carries Last Time Buy status, indicating limited future availability. This part is suitable for applications where existing inventory can support near-term production needs but should not be selected for new long-term designs.

Obsolete Substitute (Not Recommended)

The P0118DA 5AL3 carries Obsolete product status and should not be selected for new designs or ongoing production. While electrically compatible, its lifecycle status creates supply chain risk.

Frequently Asked Questions (FAQ)

Q: Can I directly substitute P0102DA 1AA3 for EC103D2 in my circuit?

A: Yes. The P0102DA 1AA3 matches all critical electrical parameters: 400V off-state voltage, 800mV gate trigger voltage, and 800mA RMS on-state current. Both use TO-92-3 through-hole packaging. The extended temperature range (-40°C to 125°C versus -40°C to 110°C) provides additional operational margin.

Q: What is the difference between P0102DA 1AA3, P0102DA 2AL3, and P0102DA 5AL3?

A: All three variants are electrically identical. The differences are packaging format and lead configuration. P0102DA 1AA3 is supplied in Bulk packaging. P0102DA 2AL3 and P0102DA 5AL3 are supplied in Cut Tape (CT) format. P0102DA 5AL3 includes formed leads. Select based on your assembly equipment and tape reel compatibility requirements.

Q: Why does P0102DA have higher gate trigger current (200µA) than EC103D2 (50µA)?

A: Both parts are classified as sensitive gate SCRs and meet the 800mV gate trigger voltage specification. The gate trigger current specification represents the maximum current required to trigger the device at the specified voltage. The EC103D2 exhibits lower gate trigger current, but P0102DA remains suitable for applications designed to the 800mV gate trigger voltage parameter.

Q: Is XL0840 a suitable long-term substitute?

A: XL0840 is electrically equivalent but carries Last Time Buy status, indicating STMicroelectronics will discontinue production. It is suitable for near-term production runs where existing inventory is available but should not be selected for designs requiring multi-year component availability.

Q: Are all substitutes RoHS3 compliant?

A: Yes. The EC103D2 and all identified substitutes carry ROHS3 Compliant certification, meeting lead-free and restricted substance requirements for regulated markets.

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