EC103D1RP Equivalent & Substitute Parts

Part Overview

The EC103D1RP is a 400V 800mA sensitive gate SCR manufactured by Littelfuse Inc. in TO-92 through-hole packaging. This thyristor is designed for general-purpose switching and control applications requiring reliable gate triggering at low current levels. The part is currently active in production with 811 units in stock.

Equivalent and substitute parts are necessary when the original EC103D1RP becomes unavailable, when alternative packaging formats are required, or when sourcing from multiple manufacturers is needed to optimize supply chain reliability and cost efficiency.

Key Parameters

Parameter	Value
Voltage - Off State	400 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	12 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
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
SCR Type	Sensitive Gate

Substitute Part Grouping Explanation

Substitution eligibility for the EC103D1RP is determined by the following critical parameters:

Voltage Rating (Off State): Must be 400 V
Gate Trigger Voltage (Vgt): Must not exceed 800 mV
RMS Current Rating: Must support 800 mA
Package Type: Must be TO-92-3 through-hole configuration
SCR Type: Must be sensitive gate
Mounting: Must be through-hole

The substitute parts listed below meet these core electrical and mechanical requirements. STMicroelectronics P0102DA and P0109DA series parts satisfy all substitution criteria. The P0118DA 5AL3 variant is included for reference but carries obsolete product status.

Parameter Comparison

Parameter	EC103D1RP (Littelfuse)	P0102DA 1AA3 (STM)	P0102DA 2AL3 (STM)	P0102DA 5AL3 (STM)	P0109DA 5AL3 (STM)	P0118DA 5AL3 (STM)
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)	12 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
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

Primary Substitutes (Active Status)

The P0102DA series from STMicroelectronics represents the primary substitution path for EC103D1RP applications. All three variants—P0102DA 1AA3 (Bulk packaging), P0102DA 2AL3 (Cut Tape), and P0102DA 5AL3 (Cut Tape)—are electrically equivalent and maintain active product status. These parts are functionally interchangeable with the EC103D1RP, with extended operating temperature range (-40°C to 125°C versus -40°C to 110°C). Inventory availability is substantial across all three packaging options, with P0102DA 5AL3 offering the highest stock level at 35,300 units.

Secondary Substitute (Active Status)

The P0109DA 5AL3 is an active alternative with identical electrical specifications to the P0102DA series. This part maintains full compatibility with EC103D1RP circuit requirements and is available in Cut Tape packaging with 3,567 units in stock.

Reference Only (Obsolete Status)

The P0118DA 5AL3 is included for reference purposes only. Although electrically compatible and ROHS3 compliant, this part carries obsolete product status and should not be selected for new designs or long-term production applications. Current inventory of 2,400 units does not offset the discontinued manufacturing status.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original EC103D1RP specifications.

Frequently Asked Questions (FAQ)

Q: Can P0102DA series parts directly replace EC103D1RP in existing designs?

A: Yes. The P0102DA 1AA3, P0102DA 2AL3, and P0102DA 5AL3 are direct electrical and mechanical equivalents. All maintain 400V off-state voltage, 800mA RMS current rating, TO-92-3 through-hole packaging, and sensitive gate SCR configuration. The extended operating temperature range (-40°C to 125°C) provides additional margin compared to the EC103D1RP specification.

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

A: These three variants are electrically identical. The differences are packaging format and inventory availability. P0102DA 1AA3 is supplied in Bulk packaging, while P0102DA 2AL3 and P0102DA 5AL3 are supplied in Cut Tape format. P0102DA 5AL3 has the highest stock availability at 35,300 units.

Q: Why does P0102DA show higher gate trigger current (200 µA) compared to EC103D1RP (12 µA)?

A: The P0102DA maximum gate trigger current specification is higher, but this does not prevent substitution. The 800mV gate trigger voltage specification remains identical, which is the primary parameter controlling gate sensitivity. The higher Igt maximum represents a broader specification window and does not affect circuit compatibility.

Q: Should P0118DA 5AL3 be used as a substitute?

A: No. Although P0118DA 5AL3 is electrically compatible, it carries obsolete product status. For new designs and ongoing production, select from the active P0102DA or P0109DA series instead.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts—P0102DA 1AA3, P0102DA 2AL3, P0102DA 5AL3, and P0109DA 5AL3—are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original EC103D1RP.

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