EC103D2RP Equivalent & Substitute Parts

Part Overview

The EC103D2RP is a 400V 800mA sensitive gate SCR manufactured by Littelfuse Inc. in TO-92 through-hole packaging. This component is currently active in production with 893 units in stock. The EC103D2RP serves as a thyristor for power control and switching applications requiring a 400V off-state voltage rating with sensitive gate triggering characteristics. Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required, or when sourcing from different manufacturers is preferred for supply chain optimization.

Key Parameters

Parameter	Value
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°C to 110°C
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type	Through Hole
SCR Type	Sensitive Gate

Substitute Part Grouping Explanation

Substitution eligibility for the EC103D2RP is determined by the following critical parameters:

Off-state voltage rating: 400 V (exact match required)
Gate trigger voltage (Vgt): 800 mV maximum (exact match required)
On-state RMS current rating: 800 mA (exact match required)
SCR type: Sensitive Gate (exact match required)
Package / Case: TO-226-3, TO-92-3 (TO-226AA) (exact match required)
Mounting type: Through Hole (exact match required)

The substitute parts listed below meet all critical electrical and mechanical parameters. Variations in gate trigger current (Igt), on-state voltage (Vtm), and operating temperature range do not disqualify substitution when the above parameters are satisfied. Packaging format (Bulk, Cut Tape, Tape & Reel) represents a logistical variation and does not affect electrical compatibility.

Parameter Comparison

Parameter	EC103D2RP (Littelfuse)	P0102DA 1AA3 (STMicroelectronics)	P0102DA 2AL3 (STMicroelectronics)	P0102DA 5AL3 (STMicroelectronics)	P0109DA 5AL3 (STMicroelectronics)	P0118DA 5AL3 (STMicroelectronics)
Voltage - Off State	400 V	400 V	400 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	200 µA	200 µA	200 µA	200 µA	5 µA
Voltage - On State (Vtm) (Max)	1.7 V	1.95 V	1.95 V	1.95 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 Range	-40°C to 110°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
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
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate
Product Status	Active	Active	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts meet the critical electrical and mechanical parameters required for direct replacement of the EC103D2RP. All parts are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance across applications.

For new designs and ongoing production, P0102DA 5AL3 is the preferred substitute due to its active product status and highest inventory availability (35,300 units). This part is manufactured by STMicroelectronics and supplied in Cut Tape packaging format.

P0102DA 2AL3 and P0102DA 1AA3 are functionally equivalent alternatives with active product status. P0102DA 2AL3 offers 10,100 units in stock with Cut Tape packaging, while P0102DA 1AA3 provides 4,848 units in Bulk packaging.

P0109DA 5AL3 is an active substitute with 3,567 units available in Cut Tape format and represents an alternative sourcing option.

P0118DA 5AL3 carries an obsolete product status and should not be selected for new applications. This part is retained in the substitution list for legacy system maintenance only, with 2,400 units currently in inventory.

Frequently Asked Questions (FAQ)

Q: Can P0102DA 5AL3 directly replace EC103D2RP in existing circuits?

A: Yes. P0102DA 5AL3 meets all critical electrical parameters: 400V off-state voltage, 800mV gate trigger voltage, 800mA RMS current rating, and sensitive gate SCR type. The TO-92-3 package is mechanically compatible with the original TO-92 through-hole footprint. The higher operating temperature range (-40°C to 125°C versus -40°C to 110°C) provides additional thermal margin.

Q: What is the difference between the P0102DA variants (1AA3, 2AL3, 5AL3)?

A: The variants differ only in packaging format and inventory source. P0102DA 1AA3 is supplied in Bulk packaging, P0102DA 2AL3 in Cut Tape, and P0102DA 5AL3 in Cut Tape. All three variants are electrically identical and interchangeable. Selection should be based on procurement requirements and available inventory.

Q: Why does P0118DA 5AL3 show as obsolete?

A: P0118DA 5AL3 has been discontinued by the manufacturer and is no longer in active production. While it remains electrically compatible and inventory is available, it should only be used for repair and maintenance of existing systems. For new designs, select from the active substitute parts: P0102DA 1AA3, P0102DA 2AL3, P0102DA 5AL3, or P0109DA 5AL3.

Q: Are there differences in gate trigger current between the substitutes?

A: Yes. The EC103D2RP specifies a maximum gate trigger current (Igt) of 50 µA, while P0102DA variants and P0109DA 5AL3 specify 200 µA maximum. P0118DA 5AL3 specifies 5 µA maximum. These variations do not affect substitution eligibility. Gate trigger current differences are within acceptable tolerances for sensitive gate SCR applications and do not compromise circuit functionality.

Q: What packaging formats are available for the substitute parts?

A: P0102DA 1AA3 is available in Bulk packaging. P0102DA 2AL3 and P0102DA 5AL3 are supplied in Cut Tape format. P0109DA 5AL3 is supplied in Cut Tape format. All parts use the same TO-92-3 through-hole package case. Packaging format selection depends on assembly process requirements and order quantity.

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