EC103B1RP Equivalent & Substitute Parts

Part Overview

The EC103B1RP is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 200 V off-state voltage and 800 mA on-state current in a TO-92 through-hole package, manufactured by Littelfuse Inc. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The part maintains ROHS3 compliance and operates across the industrial temperature range of -40°C to 110°C.

Substiute Parts

EC103B1RP

Littelfuse Inc.In Stock: 1201EC103B1RP Datasheet

Current PartRFQ

EC103D1RP

Littelfuse Inc.In Stock: 879EC103D1RP Datasheet

UpgradeRFQ

EC103M1RP

Littelfuse Inc.In Stock: 1098EC103M1RP Datasheet

UpgradeRFQ

P0118DA 5AL3

STMicroelectronicsIn Stock: 2465P0118DA 5AL3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the EC103B1RP is determined by the following critical parameters: off-state voltage rating, gate trigger voltage and current, on-state voltage drop, on-state current capability, hold current, operating temperature range, and package compatibility. All substitute parts must maintain the TO-92 through-hole form factor and sensitive gate SCR topology.

The EC103B1RP operates at 200 V off-state. Substitute parts are grouped into two categories:

Upgrade Category (Higher Voltage Rating): EC103D1RP (400 V) and EC103M1RP (600 V) are direct Littelfuse alternatives with identical gate trigger specifications, on-state current ratings, and temperature range. These parts are pin-compatible and can replace the EC103B1RP in applications where higher voltage headroom is acceptable or required.

Cross-Manufacturer Alternative: P0118DA 5AL3 from STMicroelectronics provides a 400 V rated option with comparable electrical characteristics, though with minor variations in gate trigger current (5 µA vs. 12 µA) and on-state voltage drop (1.95 V vs. 1.7 V). This part is obsolete and should be considered only when Littelfuse alternatives are unavailable.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production continuity, EC103D1RP and EC103M1RP are the preferred substitutes. Both parts are manufactured by Littelfuse Inc., carry active product status, and maintain full ROHS3 compliance. EC103D1RP provides a direct 400 V upgrade path with identical electrical characteristics to the EC103B1RP except for voltage rating. EC103M1RP extends voltage capability to 600 V while preserving all other specifications.

The P0118DA 5AL3 from STMicroelectronics is classified as obsolete and carries higher supply risk. Selection of this part should be limited to legacy system maintenance where no other alternatives are available. The minor differences in gate trigger current and on-state voltage drop may require circuit validation.

All substitute parts maintain TO-92-3 package compatibility and through-hole mounting, ensuring mechanical and electrical interchangeability at the board level.

Frequently Asked Questions (FAQ)

Q: Can EC103D1RP directly replace EC103B1RP in all applications?

A: Yes, EC103D1RP is pin-compatible and electrically compatible. The 400 V off-state rating provides higher voltage margin than the original 200 V specification. Applications operating below 200 V will function identically; applications requiring higher voltage headroom benefit from the upgrade.

Q: What is the difference between EC103D1RP and EC103M1RP?

A: Both parts are Littelfuse Sensitive Gate SCRs with identical gate trigger, on-state current, and temperature specifications. The primary difference is off-state voltage rating: EC103D1RP is rated 400 V, while EC103M1RP is rated 600 V. Selection depends on the maximum voltage the application must withstand.

Q: Why is P0118DA 5AL3 listed as an alternative if it is obsolete?

A: P0118DA 5AL3 is included for reference in legacy system support scenarios. It provides a 400 V rated option from an alternative manufacturer but carries supply discontinuation risk. Littelfuse alternatives (EC103D1RP or EC103M1RP) are strongly preferred for new designs.

Q: Are there packaging differences between these parts?

A: All substitute parts use TO-92-3 through-hole packaging with formed leads. EC103D1RP and EC103M1RP are supplied in Tape & Reel format, while P0118DA 5AL3 is supplied in Cut Tape format. The physical package remains identical for board-level compatibility.

Q: What is the impact of the on-state voltage difference in P0118DA 5AL3?

A: P0118DA 5AL3 has a maximum on-state voltage of 1.95 V compared to 1.7 V for the EC103B1RP. This 0.25 V difference increases power dissipation in the conducting state. Circuit validation is recommended if thermal margins are tight.

Q: Do all substitute parts maintain the same temperature operating range?

A: EC103D1RP and EC103M1RP maintain the -40°C to 110°C range of the EC103B1RP. P0118DA 5AL3 extends to -40°C to 125°C, providing additional high-temperature margin if required by the application.