Q2N3RP TRIAC Equivalent & Substitute Parts

Part Overview

The Q2N3RP is a Logic-Sensitive Gate TRIAC manufactured by Littelfuse, rated for 200V off-state voltage and 1A on-state current in a surface mount DO-214 (Compak) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The Q2N3RP serves as a solid-state switch for AC circuit control applications requiring sensitive gate triggering. Substitutes must maintain functional compatibility across gate trigger characteristics, thermal performance, and package form factor while accommodating voltage and current ratings appropriate to the application.

Substiute Parts

Q2N3RP

LittelfuseIn Stock: 1085Q2N3RP Datasheet

Current PartRFQ

Q4N3RP

Littelfuse Inc.In Stock: 20084Q4N3RP Datasheet

UpgradeRFQ

Q6N3RP

Littelfuse Inc.In Stock: 3304Q6N3RP Datasheet

UpgradeRFQ

BT131W-600,135

WeEn SemiconductorsIn Stock: 748BT131W-600,135 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the Q2N3RP is based on the following criteria:

Primary Compatibility Parameters:

• Triac Type: Logic - Sensitive Gate configuration
• Current Rating: 1A on-state current (It RMS, Max)
• Gate Trigger Voltage (Vgt): Maximum 1.3V to 1.5V
• Gate Trigger Current (Igt): Maximum 10mA or lower
• Operating Temperature: -40°C to 125°C minimum
• Mounting Type: Surface Mount
• Package Compatibility: DO-214 or equivalent form factor

Voltage Rating Consideration: Substitutes are grouped by off-state voltage rating. Higher voltage-rated devices (400V, 600V) are electrically compatible with 200V applications and provide design margin. Lower voltage-rated devices are not suitable.

Substitute Categories:

1. Littelfuse Q4N3RP (400V Rating) – Direct upgrade within same manufacturer and package family
2. Littelfuse Q6N3RP (600V Rating) – Higher voltage rating within same manufacturer and package family
3. WeEn Semiconductors BT131W-600,135 (600V Rating) – Manufacturer-recommended alternative with different package form factor (SC-73)

Parameter Comparison

Engineering Selection Recommendations

For Direct Package Compatibility (DO-214 Compak):

Q4N3RP and Q6N3RP are preferred substitutes. Both maintain the identical DO-214AA SMB (3 Leads) Compak package form factor, enabling direct PCB footprint compatibility without layout modifications. Both parts are active products with current manufacturing status and full RoHS3 compliance. Q4N3RP provides 400V rating, while Q6N3RP provides 600V rating. Selection between these depends on application voltage requirements.

For Alternative Package Consideration (SC-73):

BT131W-600,135 is a manufacturer-recommended alternative from WeEn Semiconductors. This part requires PCB layout modification due to different package form factor (TO-261-4, SC-73 versus DO-214AA). The BT131W-600,135 offers lower gate trigger current (3mA versus 10mA) and lower hold current (5mA versus 15mA), which may reduce gate drive circuit complexity. This part is active and RoHS compliant.

Compliance Considerations:

All substitute parts maintain RoHS compliance. Q6N3RP carries REACH Affected status, while Q4N3RP carries REACH Unaffected status. BT131W-600,135 carries standard RoHS compliance. Regulatory requirements for the end application should guide final selection.

Frequently Asked Questions (FAQ)

Q: Can Q4N3RP or Q6N3RP be used as direct replacements for Q2N3RP without PCB modification?

A: Yes. Q4N3RP and Q6N3RP use identical DO-214AA SMB (3 Leads) Compak packaging, enabling direct footprint compatibility. No PCB layout changes are required.

Q: What is the difference between Q4N3RP and Q6N3RP?

A: Both parts are Littelfuse Logic-Sensitive Gate TRIACs with identical gate trigger and hold current specifications. The primary difference is off-state voltage rating: Q4N3RP is rated 400V, while Q6N3RP is rated 600V. Selection depends on the application's maximum AC voltage requirement.

Q: Why does BT131W-600,135 have lower gate trigger current (3mA) compared to Q2N3RP (10mA)?

A: BT131W-600,135 is manufactured by WeEn Semiconductors using different semiconductor process technology. Lower gate trigger current indicates higher gate sensitivity. This may reduce gate drive circuit power requirements but requires verification that existing gate drive circuits can operate within the specified voltage and current ranges.

Q: Is BT131W-600,135 a suitable substitute if PCB layout modification is not possible?

A: No. BT131W-600,135 uses TO-261-4 SC-73 package, which differs from the Q2N3RP DO-214AA package. PCB footprint modification is required. Use Q4N3RP or Q6N3RP for direct package compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. Q4N3RP and Q6N3RP are ROHS3 compliant. BT131W-600,135 is RoHS compliant. All parts meet RoHS requirements for new designs.

Q: What is the minimum operating temperature range for substitute parts?

A: Q4N3RP and Q6N3RP support -40°C to 125°C (TJ). BT131W-600,135 specifies 125°C (TJ) maximum. Applications requiring operation below 0°C should use Q4N3RP or Q6N3RP.