EC103E2 SCR 500V 800mA TO-92 Equivalent & Substitute Parts

Part Overview

The EC103E2 is a sensitive gate silicon controlled rectifier (SCR) rated for 500V off-state voltage and 800mA RMS current, housed in a TO-92 through-hole package. Manufactured by Littelfuse Inc., this component is classified as obsolete. Due to its obsolete status and limited remaining inventory (931 pcs), identifying functionally equivalent active alternatives is necessary for ongoing design support and production continuity.

Key Parameters

Parameter	EC103E2
Voltage - Off State	500 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 (AV)) (Max)	510 mA
Current - On State (It (RMS)) (Max)	800 mA
Current - Hold (Ih) (Max)	5 mA
Current - Off State (Max)	1 µA
SCR Type	Sensitive Gate
Operating Temperature Range	-40°C to 110°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the EC103E2 is determined by the following critical parameters:

SCR Type: Must be Sensitive Gate configuration
Mounting Type: Must be Through Hole to maintain PCB compatibility
Package / Case: Must be TO-92-3 (TO-226AA) for physical fit
Voltage - Off State: Substitute must meet or exceed 500V rating
Current - On State (It (RMS)): Substitute must support 800mA RMS minimum
Gate Trigger Characteristics: Voltage (Vgt) and current (Igt) must be compatible with existing gate drive circuits
Operating Temperature Range: Substitute must cover the required thermal envelope
RoHS Compliance: Must maintain ROHS3 compliance for regulatory continuity

The X00602MA 1AA2 from STMicroelectronics meets these substitution criteria as an active product with enhanced electrical ratings and extended temperature range.

Parameter Comparison

Parameter	EC103E2 (Littelfuse)	X00602MA 1AA2 (STMicroelectronics)	Compatibility Notes
Voltage - Off State	500 V	600 V	Substitute rated higher; acceptable for 500V applications
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	Identical specification
Current - Gate Trigger (Igt) (Max)	50 µA	200 µA	Substitute requires higher gate drive current
Voltage - On State (Vtm) (Max)	1.7 V	1.35 V	Substitute has lower on-state voltage; improved efficiency
Current - On State (It (RMS)) (Max)	800 mA	800 mA	Identical specification
Current - Hold (Ih) (Max)	5 mA	5 mA	Identical specification
Current - Off State (Max)	1 µA	1 µA	Identical specification
SCR Type	Sensitive Gate	Sensitive Gate	Identical type
Operating Temperature Range	-40°C to 110°C	-40°C to 125°C	Substitute has extended upper temperature limit
Mounting Type	Through Hole	Through Hole	Identical mounting
Package / Case	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA)	Identical package
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical MSL rating

Engineering Selection Recommendations

The X00602MA 1AA2 is the recommended substitute for the obsolete EC103E2 based on the following factors:

Product Status: The X00602MA 1AA2 is an active product with 7600 pcs in stock, ensuring long-term availability compared to the EC103E2's obsolete status with limited inventory.
Regulatory Compliance: Both components maintain ROHS3 compliance and identical MSL ratings, supporting regulatory continuity in production environments.
Electrical Compatibility: The substitute meets all critical electrical parameters for 500V, 800mA SCR applications. The higher off-state voltage rating (600V vs 500V) provides additional design margin without compromising functionality.
Thermal Performance: The extended operating temperature range (-40°C to 125°C vs -40°C to 110°C) accommodates broader environmental conditions.
Gate Drive Consideration: The substitute requires higher gate trigger current (200µA vs 50µA). Existing gate drive circuits must be evaluated to confirm adequate current sourcing capability.

Frequently Asked Questions (FAQ)

Q: Can the X00602MA 1AA2 directly replace the EC103E2 without circuit modifications?

A: Physical and package compatibility is direct (TO-92-3). However, the gate trigger current specification differs (200µA vs 50µA). Gate drive circuits must be verified to supply the higher current requirement. All other electrical parameters are compatible or superior.

Q: Why is the substitute rated for 600V when the original is 500V?

A: Higher voltage ratings provide additional design margin and do not degrade performance in 500V applications. The substitute remains fully functional at the original 500V operating point.

Q: Are there any thermal considerations when switching to the X00602MA 1AA2?

A: The substitute supports an extended temperature range (125°C vs 110°C maximum). This provides greater flexibility for high-temperature environments. On-state voltage is also lower (1.35V vs 1.7V), resulting in reduced power dissipation.

Q: What is the impact of the different gate trigger current specification?

A: The X00602MA 1AA2 requires 200µA maximum gate trigger current compared to 50µA for the EC103E2. Gate drive circuits must be capable of sourcing this current. Verify that existing gate drivers or control circuits can supply the required current without exceeding their output specifications.

Q: Are both components RoHS compliant?

A: Yes. Both the EC103E2 and X00602MA 1AA2 are ROHS3 compliant with identical MSL ratings (1 - Unlimited), supporting regulatory requirements in production and supply chain management.

Q: What is the inventory status of each component?

A: The EC103E2 has 931 pcs available but is classified as obsolete. The X00602MA 1AA2 is an active product with 7600 pcs in stock, providing superior long-term availability for ongoing production needs.

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