LX803ME TRIAC Equivalent & Substitute Parts

Part Overview

The LX803ME is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 600 V off-state voltage and 800 mA on-state current in a Through Hole TO-92 package. This component is Active status and ROHS3 compliant. Substitute parts are necessary when the original LX803ME is unavailable, when alternative packaging formats are required, or when higher current ratings are needed for circuit redesign.

Substiute Parts

LX803ME

Littelfuse Inc.In Stock: 1021LX803ME Datasheet

Current PartRFQ

Z00607MA 1BA2

STMicroelectronicsIn Stock: 4439Z00607MA 1BA2 Datasheet

MFR RecommendedRFQ

Z00607MA 5BL2

STMicroelectronicsIn Stock: 5053Z00607MA 5BL2 Datasheet

MFR RecommendedRFQ

Z0103MA 1AA2

STMicroelectronicsIn Stock: 90422Z0103MA 1AA2 Datasheet

MFR RecommendedRFQ

Z0107MA 1AA2

STMicroelectronicsIn Stock: 6239Z0107MA 1AA2 Datasheet

MFR RecommendedRFQ

Z0109MA 1AA2

STMicroelectronicsIn Stock: 90145Z0109MA 1AA2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LX803ME are grouped based on the following allowed electrical and mechanical parameters:

Critical Parameters for Substitution:

• Voltage - Off State: 600 V (must match exactly)
• Triac Type: Logic - Sensitive Gate (must match exactly)
• Mounting Type: Through Hole (must match exactly)
• Package / Case: TO-92-3 (must match exactly)
• Configuration: Single (must match exactly)

Allowable Variations:

• Current - On State (It (RMS)) (Max): 800 mA or higher
• Voltage - Gate Trigger (Vgt) (Max): 1.3 V or lower
• Current - Gate Trigger (Igt) (Max): 3 mA or higher
• Current - Hold (Ih) (Max): 5 mA or higher
• Operating Temperature: -40°C ~ 110°C or wider range
• Packaging Format: Bulk or Cut Tape (CT)

All substitute parts listed are manufactured by STMicroelectronics and maintain ROHS3 compliance and REACH Unaffected status.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (800 mA Current Rating): Z00607MA 1BA2 and Z00607MA 5BL2 are direct electrical equivalents to the LX803ME. Both maintain the 800 mA on-state current rating and 1.3 V gate trigger voltage. The primary difference is packaging format: Z00607MA 1BA2 is supplied in Bulk, while Z00607MA 5BL2 is supplied in Cut Tape with formed leads. Both are ROHS3 compliant and REACH Unaffected.

Higher Current Alternatives (1 A Current Rating): Z0103MA 1AA2, Z0107MA 1AA2, and Z0109MA 1AA2 provide increased on-state current capacity at 1 A, suitable for applications requiring higher current handling. These parts extend the operating temperature range to -40°C ~ 125°C. All three maintain the 600 V off-state voltage and TO-92-3 package. Selection among these three depends on gate trigger current requirements: Z0103MA 1AA2 specifies 3 mA, Z0107MA 1AA2 specifies 5 mA, and Z0109MA 1AA2 specifies 10 mA.

All substitute parts are Active status, ROHS3 compliant, and REACH Unaffected, matching the compliance profile of the original LX803ME.

Frequently Asked Questions (FAQ)

Q: Can Z00607MA 1BA2 be used as a direct replacement for LX803ME? A: Yes. Z00607MA 1BA2 matches all critical electrical parameters: 600 V off-state voltage, 800 mA on-state current, 1.3 V gate trigger voltage, and TO-92-3 package. The only difference is the manufacturer (STMicroelectronics vs. Littelfuse Inc.). Both are ROHS3 compliant.

Q: What is the difference between Z00607MA 1BA2 and Z00607MA 5BL2? A: Both parts are electrically identical with 800 mA current rating and matching electrical specifications. Z00607MA 1BA2 is supplied in Bulk packaging, while Z00607MA 5BL2 is supplied in Cut Tape (CT) with formed leads. The choice depends on assembly process requirements.

Q: When should I use the 1 A rated parts (Z0103MA, Z0107MA, Z0109MA) instead of the 800 mA parts? A: Use 1 A rated parts when your circuit requires higher current handling capacity. These parts maintain the same 600 V voltage rating and TO-92-3 package but provide 25% additional current capacity. They also offer an extended operating temperature range to 125°C.

Q: Are all substitute parts compatible with the LX803ME footprint? A: Yes. All substitute parts use the TO-92-3 (TO-226AA) package and Through Hole mounting type, ensuring mechanical and electrical compatibility with LX803ME PCB layouts.

Q: Do all substitute parts meet the same compliance standards as LX803ME? A: Yes. All listed substitute parts are ROHS3 compliant and REACH Unaffected, matching the compliance profile of the original LX803ME.

Q: What is the difference in gate trigger current specifications among the 1 A rated parts? A: Z0103MA 1AA2 specifies 3 mA maximum gate trigger current, Z0107MA 1AA2 specifies 5 mA, and Z0109MA 1AA2 specifies 10 mA. Lower gate trigger current values indicate more sensitive gate triggering. Select based on your gate drive circuit capabilities.