EC103D3 Equivalent & Substitute Parts

Part Overview

The EC103D3 is a 400V 800mA sensitive gate SCR (Silicon Controlled Rectifier) in TO-92 through-hole packaging manufactured by Littelfuse Inc. This thyristor is designed for general-purpose switching and control applications requiring moderate voltage and current ratings with sensitive gate triggering characteristics.

The EC103D3 maintains active product status with 718 units in stock. Substitute parts are identified based on matching electrical specifications within the allowed parameter tolerances for this thyristor category, including off-state voltage, gate trigger characteristics, on-state voltage and current ratings, and thermal operating range.

Key Parameters

Parameter	EC103D3 Value	Unit
Voltage - Off State	400	V
Voltage - Gate Trigger (Vgt) Max	800	mV
Current - Gate Trigger (Igt) Max	500	µA
Voltage - On State (Vtm) Max	1.7	V
Current - On State (It RMS) Max	800	mA
Current - Hold (Ih) Max	8	mA
Operating Temperature Range	-40 to 110	°C
Package / Case	TO-92-3	—
SCR Type	Sensitive Gate	—

Substitute Part Grouping Explanation

Substitution eligibility for the EC103D3 is determined by the following critical parameters:

Primary Matching Criteria:

Off-state voltage rating: 400V (exact match required)
Gate trigger voltage (Vgt): 800mV maximum (exact match required)
On-state RMS current rating: 800mA (exact match required)
Package type: TO-92-3 through-hole (exact match required)
SCR type: Sensitive Gate (exact match required)

Secondary Compatibility Parameters:

Gate trigger current (Igt): Must not exceed 500µA maximum
On-state voltage (Vtm): Must not exceed 1.7V maximum
Hold current (Ih): Must not exceed 8mA maximum
Operating temperature range: Must encompass -40°C to 110°C minimum

Substitute parts are grouped into two categories:

Group 1 - Direct Electrical Equivalents (400V Rating): Parts meeting all primary criteria with 400V off-state voltage: P0102DA 1AA3, P0102DA 2AL3, P0102DA 5AL3, XL0840

Group 2 - Higher Voltage Rating (600V Rating): Parts with elevated off-state voltage that provide overvoltage margin: X00602MA 1AA2

Group 3 - Obsolete Status: Parts no longer in active production: P0118DA 5AL3

Parameter Comparison

Parameter	EC103D3	P0102DA 1AA3	P0102DA 2AL3	P0102DA 5AL3	XL0840	X00602MA 1AA2	P0118DA 5AL3
Manufacturer	Littelfuse	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Voltage - Off State (V)	400	400	400	400	400	600	400
Voltage - Gate Trigger Max (mV)	800	800	800	800	800	800	800
Current - Gate Trigger Max (µA)	500	200	200	200	200	200	5
Voltage - On State Max (V)	1.7	1.95	1.95	1.95	1.95	1.35	1.95
Current - On State RMS Max (mA)	800	800	800	800	800	800	800
Current - Hold Max (mA)	8	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	-40 to 125
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Active	Active	Active	Active	Last Time Buy	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Substitutes (Active Status, Recommended for New Designs):

P0102DA 5AL3, P0102DA 2AL3, and P0102DA 1AA3 are STMicroelectronics equivalents with active product status. These parts maintain identical electrical ratings for off-state voltage, gate trigger voltage, and on-state current specifications. All three variants are ROHS3 compliant and REACH unaffected. The P0102DA 5AL3 offers the highest inventory availability at 35,300 units in cut tape packaging. Selection between these three variants depends on packaging requirements: P0102DA 1AA3 is available in bulk packaging, while P0102DA 2AL3 and P0102DA 5AL3 are supplied in cut tape format.

Alternative Substitute (Active Status, Higher Voltage Rating):

X00602MA 1AA2 provides a 600V off-state voltage rating, offering increased overvoltage margin compared to the 400V EC103D3. This part maintains the same 800mA on-state current rating and sensitive gate characteristics. The higher voltage rating makes this suitable for applications requiring additional voltage headroom. X00602MA 1AA2 is ROHS3 compliant and REACH unaffected with 7,600 units available in bulk packaging.

Last Time Buy Status:

XL0840 carries last time buy product status, indicating limited future availability. While electrically equivalent to the EC103D3 with 400V rating and matching current specifications, procurement of this part should be limited to applications where long-term supply is not critical. 30,100 units are currently available in bulk packaging.

Obsolete Status:

P0118DA 5AL3 is classified as obsolete and should not be selected for new designs or long-term applications. This part is retained in the substitute list for reference only in legacy system maintenance scenarios.

Frequently Asked Questions (FAQ)

Q: Can P0102DA series parts directly replace EC103D3 in existing designs?

A: Yes. P0102DA 1AA3, P0102DA 2AL3, and P0102DA 5AL3 are direct electrical equivalents with matching 400V off-state voltage, 800mV gate trigger voltage, and 800mA on-state current ratings. All three maintain TO-92-3 through-hole packaging and sensitive gate SCR type. The primary difference is packaging format: bulk versus cut tape. Pin configuration and electrical performance are identical.

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

A: These three part numbers represent the same electrical device with different packaging and tape specifications. P0102DA 1AA3 is supplied in bulk packaging. P0102DA 2AL3 and P0102DA 5AL3 are supplied in cut tape format with different tape reel configurations. Electrical specifications and performance are identical across all three variants.

Q: Why is X00602MA 1AA2 listed as a substitute if it has 600V rating instead of 400V?

A: X00602MA 1AA2 is a valid substitute for applications where the 400V EC103D3 is specified because it meets or exceeds all critical electrical parameters. The 600V off-state voltage provides additional overvoltage protection margin while maintaining the same 800mA on-state current rating and sensitive gate triggering characteristics. This part is suitable when higher voltage headroom is beneficial or when 400V-rated parts are unavailable.

Q: Should I use P0118DA 5AL3 as a substitute?

A: No. P0118DA 5AL3 is classified as obsolete and should not be selected for new designs. This part is listed for reference only in applications involving legacy system maintenance or repair where the original part is no longer available and immediate replacement is required.

Q: What is the significance of XL0840 being in "Last Time Buy" status?

A: Last time buy status indicates that STMicroelectronics will no longer manufacture this part after current inventory is depleted. While XL0840 is electrically equivalent to EC103D3, procurement should be limited to applications where long-term supply continuity is not required. For new designs or applications requiring extended component availability, P0102DA series parts are recommended.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—P0102DA 1AA3, P0102DA 2AL3, P0102DA 5AL3, XL0840, X00602MA 1AA2, and P0118DA 5AL3—are ROHS3 compliant and REACH unaffected, matching the compliance status of the EC103D3.

Q: Can I use these substitutes in applications with operating temperatures above 110°C?

A: All substitute parts are rated for operating temperatures up to 125°C, which exceeds the EC103D3 maximum of 110°C. Substitutes provide extended temperature capability and are suitable for applications requiring operation up to 125°C.

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