EC103B2 Equivalent & Substitute Parts

Part Overview

The EC103B2 is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 200V off-state voltage with 800mA on-state current in a TO-92 through-hole package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The EC103B2 maintains compatibility with applications requiring low gate trigger requirements and sensitive gate characteristics within its voltage and current specifications.

Key Parameters

Parameter	Value
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
SCR Type	Sensitive Gate
Operating Temperature	-40°C ~ 110°C
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the EC103B2 is determined by the following critical parameters:

SCR Type: All substitutes must be Sensitive Gate SCR devices
Package / Case: All substitutes must use TO-92-3 (TO-226AA) through-hole packaging
Mounting Type: Through hole configuration required
Gate Trigger Characteristics: Vgt (Max) 800 mV and Igt (Max) ≤ 50 µA
On-State Current: It (RMS) (Max) 800 mA
Hold Current: Ih (Max) 5 mA
Operating Temperature Range: Minimum -40°C ~ 110°C
Compliance: ROHS3 Compliant

Substitutes are grouped into three categories: Littelfuse upgrades (EC103D2, EC103M2) offering higher off-state voltage ratings with identical electrical characteristics, and STMicroelectronics manufacturer-recommended alternatives (P0111DA series) providing cross-manufacturer compatibility.

Parameter Comparison

Parameter	EC103B2	EC103D2	EC103M2	P0111DA 1AA3	P0111DA 5AL3
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics	STMicroelectronics
Voltage - Off State	200 V	400 V	600 V	400 V	400 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	50 µA	50 µA	50 µA	25 µA	25 µA
Voltage - On State (Vtm) (Max)	1.7 V	1.7 V	1.7 V	1.95 V	1.95 V
Current - On State (It (RMS)) (Max)	800 mA	800 mA	800 mA	800 mA	800 mA
Current - Hold (Ih) (Max)	5 mA	5 mA	5 mA	5 mA	5 mA
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate
Operating Temperature	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 125°C	-40°C ~ 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
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Littelfuse EC103D2 (400V rating) and Littelfuse EC103M2 (600V rating) are direct Littelfuse family upgrades maintaining identical electrical characteristics while offering higher voltage ratings. Both are active products with ROHS3 compliance and unlimited moisture sensitivity level. These substitutes provide voltage margin improvements for applications where the 200V rating of the EC103B2 may be marginal.

STMicroelectronics P0111DA 1AA3 (Bulk packaging) and P0111DA 5AL3 (Cut Tape packaging) provide cross-manufacturer compatibility with 400V off-state voltage rating. These parts feature lower gate trigger current (25 µA maximum versus 50 µA) and extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 110°C). Both are active products with ROHS3 compliance and REACH unaffected status.

Selection between Littelfuse and STMicroelectronics substitutes depends on supply chain requirements, packaging format preference, and application voltage headroom needs. All substitutes maintain TO-92-3 through-hole package compatibility and sensitive gate SCR functionality.

Frequently Asked Questions (FAQ)

Q: Can EC103D2 or EC103M2 be used as direct replacements for EC103B2?

A: Yes. EC103D2 and EC103M2 maintain identical gate trigger voltage, on-state voltage, hold current, and operating temperature range as the EC103B2. The higher off-state voltage ratings (400V and 600V respectively) provide additional voltage margin without affecting circuit operation in 200V applications.

Q: What is the difference between P0111DA 1AA3 and P0111DA 5AL3?

A: Both parts are electrically identical STMicroelectronics SCRs with 400V off-state voltage. The difference is packaging format: P0111DA 1AA3 is supplied in Bulk packaging, while P0111DA 5AL3 is supplied in Cut Tape (CT) format. Electrical specifications and performance are equivalent.

Q: Are there temperature range differences between substitutes?

A: Yes. EC103B2, EC103D2, and EC103M2 operate from -40°C to 110°C. P0111DA 1AA3 and P0111DA 5AL3 extend the upper limit to 125°C. Applications requiring operation above 110°C must use STMicroelectronics parts.

Q: Do all substitutes maintain the same gate trigger current specification?

A: No. EC103B2, EC103D2, and EC103M2 specify maximum gate trigger current (Igt) of 50 µA. P0111DA 1AA3 and P0111DA 5AL3 specify 25 µA maximum, indicating improved gate sensitivity. Both values are compatible with standard gate drive circuits.

Q: Is the TO-92-3 package compatible across all substitutes?

A: Yes. All substitutes use TO-226-3 / TO-92-3 (TO-226AA) through-hole packaging with identical pinout and mechanical dimensions, enabling direct board-level substitution without layout modification.

Q: Are all substitutes RoHS3 compliant?

A: Yes. EC103B2, EC103D2, EC103M2, P0111DA 1AA3, and P0111DA 5AL3 are all ROHS3 compliant. Littelfuse parts carry MSL 1 (Unlimited) rating. STMicroelectronics parts are REACH unaffected.

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