Equivalent & Substitute Parts for Q2004V4

Part Overview

The Q2004V4 is a standard TRIAC rated for 200V off-state voltage and 4A on-state current in a TO-251 through-hole package. Manufactured by Littelfuse Inc., this component is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design and production requirements. The part operates across an industrial temperature range of -40°C to 125°C and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substiute Parts

Q2004V4

Littelfuse Inc.In Stock: 846Q2004V4 Datasheet

Current PartRFQ

BT134-600E,127

WeEn SemiconductorsIn Stock: 12575BT134-600E,127 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Q2004V4 is determined by the following critical electrical and mechanical parameters:

• Voltage Rating: The substitute must support the 200V off-state voltage requirement or higher
• Current Rating: The substitute must support the 4A on-state current (RMS) requirement or higher
• Gate Trigger Characteristics: Gate trigger voltage (Vgt) and gate trigger current (Igt) must be compatible with existing circuit design
• Hold Current: The hold current (Ih) must not exceed circuit requirements
• Package Compatibility: Through-hole mounting is required; package footprint must be compatible with PCB layout
• Temperature Range: Operating temperature must cover -40°C to 125°C minimum
• Compliance: ROHS3 compliance is required

The BT134-600E,127 qualifies as a substitute because it meets or exceeds all critical parameters while maintaining through-hole mounting and ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The BT134-600E,127 is suitable as a substitute for the Q2004V4 based on the following engineering criteria:

• Electrical Compatibility: The substitute maintains the 4A on-state current rating and exceeds the 200V off-state voltage requirement with a 600V rating, providing additional voltage margin for circuit protection
• Gate Characteristics: The substitute features a sensitive gate design with lower gate trigger current (10 mA vs. 25 mA), which may reduce gate drive circuit requirements
• Compliance: Both parts are ROHS3 compliant and carry the same ECCN and HTSUS classifications
• Availability: The substitute is actively manufactured and stocked (12,526 pcs available), ensuring supply continuity
• Temperature Coverage: The substitute supports the maximum operating temperature of 125°C; applications requiring the -40°C minimum must verify thermal performance in the lower temperature range

Package Consideration: The substitute uses SOT-82 packaging instead of TO-251-3. PCB layout modifications are required to accommodate the different footprint.

Frequently Asked Questions (FAQ)

Q: Can the BT134-600E,127 directly replace the Q2004V4 without circuit modifications?

A: Electrical substitution is valid based on current and voltage ratings. However, the different package (SOT-82 vs. TO-251-3) requires PCB layout changes. The sensitive gate design may affect gate drive circuit performance; verify gate drive voltage and current compatibility with your specific application.

Q: Why does the substitute have a higher voltage rating (600V vs. 200V)?

A: Higher voltage ratings provide additional design margin and do not prevent operation at lower voltages. The 600V rating ensures the substitute functions correctly in applications designed for 200V operation.

Q: What is the impact of the lower gate trigger current in the substitute?

A: The BT134-600E,127 requires 10 mA maximum gate trigger current compared to 25 mA for the Q2004V4. This lower requirement may reduce gate drive circuit power consumption and component stress. Verify that your gate drive circuit can reliably trigger the substitute at the specified voltage and current levels.

Q: Is the operating temperature range fully compatible?

A: The Q2004V4 specifies -40°C to 125°C operation. The BT134-600E,127 datasheet lists 125°C maximum. Applications requiring operation below 0°C must verify the substitute's performance at lower temperatures through the manufacturer's detailed specifications.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant with identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications. The substitute carries REACH Affected status, which may apply depending on your end-use market and regulatory requirements.