EC103B3 Equivalent & Substitute Parts

Part Overview

The EC103B3 is a 200V 800mA sensitive gate SCR (Silicon Controlled Rectifier) in TO-92 through-hole packaging manufactured by Littelfuse Inc. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The EC103B3 serves as a thyristor for switching and control applications requiring low gate trigger requirements and through-hole mounting compatibility.

Key Parameters

Parameter	Value
Voltage - Off State	200 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	-40°C ~ 110°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
SCR Type	Sensitive Gate
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the EC103B3 is determined by the following critical parameters: SCR type (sensitive gate), mounting type (through hole TO-92), package compatibility (TO-226-3/TO-92-3), gate trigger voltage (800 mV maximum), and current rating (800 mA RMS).

The substitute parts are grouped into two categories:

Upgrade Substitutes (Higher Voltage Rating): EC103D3 (400V) and EC103M3 (600V) from Littelfuse Inc. maintain identical gate trigger specifications, on-state voltage, hold current, and thermal operating range as the EC103B3. These parts are pin-compatible and functionally interchangeable in applications where higher blocking voltage is acceptable or required.

Manufacturer-Recommended Substitute (Cross-Manufacturer): X00602MA 1AA2 from STMicroelectronics provides equivalent 600V blocking voltage with identical gate trigger voltage (800 mV maximum), matching current ratings (800 mA RMS), and identical package configuration. This part is recommended where STMicroelectronics sourcing is preferred or required.

Parameter Comparison

Parameter	EC103B3	EC103D3	EC103M3	X00602MA 1AA2
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics
Voltage - Off State	200 V	400 V	600 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	500 µA	500 µA	500 µA	200 µA
Voltage - On State (Vtm) (Max)	1.7 V	1.7 V	1.7 V	1.35 V
Current - On State (It (RMS)) (Max)	800 mA	800 mA	800 mA	800 mA
Current - Hold (Ih) (Max)	8 mA	8 mA	8 mA	5 mA
Operating Temperature	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°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
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (Same Voltage Rating): No direct 200V equivalent is available from the provided substitute list. The EC103B3 is obsolete with no active Littelfuse equivalent at identical voltage specification.

For Upgraded Voltage Performance: EC103D3 (400V) and EC103M3 (600V) are active Littelfuse products maintaining full parameter compatibility with the EC103B3 except for increased blocking voltage. These are suitable where circuit design permits higher voltage rating without functional impact.

For Cross-Manufacturer Sourcing: X00602MA 1AA2 from STMicroelectronics is the manufacturer-recommended substitute, offering 600V blocking voltage with improved on-state voltage characteristics (1.35V vs. 1.7V maximum) and lower gate trigger current (200µA vs. 500µA maximum). This part extends the upper operating temperature to 125°C and is currently in active production with high inventory availability.

All substitute parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity), ensuring environmental and regulatory compatibility with the original EC103B3 specification.

Frequently Asked Questions (FAQ)

Q: Can EC103D3 or EC103M3 be used as direct replacements for EC103B3?

A: Yes, EC103D3 and EC103M3 are pin-compatible and functionally equivalent substitutes. Both maintain identical gate trigger voltage (800 mV), on-state voltage (1.7V maximum), hold current (8 mA), and operating temperature range (-40°C to 110°C). The primary difference is increased blocking voltage (400V and 600V respectively versus 200V). Applications operating at or below 200V will function identically with these upgrades.

Q: What are the advantages of X00602MA 1AA2 over Littelfuse alternatives?

A: X00602MA 1AA2 offers lower gate trigger current (200µA vs. 500µA maximum), lower on-state voltage (1.35V vs. 1.7V maximum), and extended operating temperature range (-40°C to 125°C vs. -40°C to 110°C). These characteristics reduce gate drive requirements and power dissipation in on-state operation.

Q: Are all substitute parts available in the same TO-92 package?

A: Yes, all substitute parts (EC103D3, EC103M3, and X00602MA 1AA2) are available in TO-226-3 and TO-92-3 (TO-226AA) through-hole packages, ensuring mechanical and electrical compatibility with EC103B3 PCB layouts.

Q: What is the difference between EC103M3 and X00602MA 1AA2 at 600V rating?

A: Both parts provide 600V blocking voltage and 800 mA RMS current rating. X00602MA 1AA2 has lower gate trigger current (200µA vs. 500µA), lower on-state voltage (1.35V vs. 1.7V), lower hold current (5 mA vs. 8 mA), and extended temperature range (125°C vs. 110°C maximum). EC103M3 maintains exact parameter matching with EC103B3 except for voltage rating.

Q: Is the EC103B3 still available for purchase?

A: EC103B3 is classified as obsolete. Substitute parts EC103D3, EC103M3, and X00602MA 1AA2 are all active products with current inventory availability.

Q: Do all parts meet RoHS3 compliance requirements?

A: Yes, EC103B3, EC103D3, EC103M3, and X00602MA 1AA2 are all ROHS3 compliant with MSL Level 1 (unlimited) moisture sensitivity rating.

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