Q401E3 Equivalent & Substitute Parts

Part Overview

The Q401E3 is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 400 V off-state voltage and 1 A on-state current in a Through Hole TO-92 package. This component is Active in product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when equivalent electrical performance can be maintained within the allowed parameter tolerances for the application circuit, particularly when higher voltage ratings or alternative sourcing is required.

Substiute Parts

Q401E3

Littelfuse Inc.In Stock: 10281Q401E3 Datasheet

Current PartRFQ

Z0109MA 1AA2

STMicroelectronicsIn Stock: 90145Z0109MA 1AA2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Z0109MA 1AA2 from STMicroelectronics qualifies as a substitute for the Q401E3 based on the following substitution criteria:

Matching Parameters:

• Triac Type: Logic - Sensitive Gate (identical)
• Current - On State (It (RMS)) (Max): 1 A (identical)
• Voltage - Gate Trigger (Vgt) (Max): 1.3 V (identical)
• Current - Gate Trigger (Igt) (Max): 10 mA (identical)
• Mounting Type: Through Hole (identical)
• Package / Case: TO-92-3 (identical)
• RoHS Status: ROHS3 Compliant (identical)

Allowable Variation:

• Voltage - Off State: Z0109MA 1AA2 rated 600 V versus Q401E3 rated 400 V. The higher voltage rating of the substitute provides equivalent or superior performance in circuits designed for 400 V operation.
• Current - Hold (Ih) (Max): Z0109MA 1AA2 rated 10 mA versus Q401E3 rated 15 mA. The lower hold current of the substitute is acceptable for circuits where the original specification allows this parameter range.
• Operating Temperature Range: Z0109MA 1AA2 rated -40 to 125°C versus Q401E3 rated -65 to 125°C. The substitute covers the upper temperature range; applications requiring -65°C minimum operation require verification of circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

Both Q401E3 and Z0109MA 1AA2 maintain Active product status with full RoHS3 compliance and REACH unaffected designation. Selection between these parts is determined by application voltage requirements and temperature operating range:

• Use Q401E3 when the circuit requires operation at minimum junction temperature of -65°C or when the 400 V off-state voltage rating is the design specification.
• Use Z0109MA 1AA2 when higher voltage margin is beneficial (600 V rating) and the circuit operates within the -40 to 125°C temperature range.

Both components are suitable for direct substitution in circuits where the electrical parameters align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can Z0109MA 1AA2 replace Q401E3 in a 400 V circuit?

A: Yes. The Z0109MA 1AA2 is rated for 600 V off-state voltage, which exceeds the 400 V requirement of the Q401E3. The higher voltage rating provides equivalent performance in 400 V applications.

Q: What is the difference in hold current between these parts?

A: The Q401E3 specifies a maximum hold current (Ih) of 15 mA, while the Z0109MA 1AA2 specifies 10 mA. The lower hold current of the substitute is acceptable for circuits designed within these parameter ranges.

Q: Are there temperature range limitations when substituting?

A: The Q401E3 operates from -65°C to 125°C, while the Z0109MA 1AA2 operates from -40°C to 125°C. If the application requires operation below -40°C junction temperature, the Q401E3 must be used.

Q: Are both parts in the same package?

A: Yes. Both Q401E3 and Z0109MA 1AA2 use the TO-92-3 (TO-226AA) Through Hole package, ensuring mechanical and electrical compatibility on the PCB.

Q: Do both parts meet the same compliance standards?

A: Yes. Both Q401E3 and Z0109MA 1AA2 are ROHS3 Compliant and REACH Unaffected, meeting equivalent environmental and regulatory requirements.