Q2N4RP TRIAC 200V 1A DO-214 Equivalent & Substitute Parts

Part Overview

The Q2N4RP is a standard TRIAC manufactured by Littelfuse Inc., rated for 200V off-state voltage and 1A on-state current in a surface mount DO-214 (Compak) package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The Q2N4RP serves in applications requiring low-voltage AC switching and control in compact surface mount form factors.

Substiute Parts

Q2N4RP

Littelfuse Inc.In Stock: 1262Q2N4RP Datasheet

Current PartRFQ

Q4N4RP

Littelfuse Inc.In Stock: 966Q4N4RP Datasheet

UpgradeRFQ

Q6N4RP

Littelfuse Inc.In Stock: 897Q6N4RP Datasheet

UpgradeRFQ

BT131W-600,135

WeEn SemiconductorsIn Stock: 748BT131W-600,135 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the Q2N4RP is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Triac Type: Standard (gate trigger characteristics must match standard gate sensitivity)
• Voltage - Off State: Minimum 200V (equal or higher voltage rating acceptable)
• Current - On State (It RMS Max): Minimum 1A (equal or higher current rating acceptable)
• Mounting Type: Surface Mount
• Package / Case: DO-214AA or equivalent compact surface mount package
• Operating Temperature Range: Must encompass -40°C to 125°C

Substitute Categories:

Upgrade Substitutes (Littelfuse Q-Series): Q4N4RP and Q6N4RP maintain identical gate trigger characteristics (Vgt 1.3V max, Igt 25mA max) and hold current (Ih 25mA max) while providing higher voltage ratings (400V and 600V respectively). Both remain in the standard TRIAC category with identical on-state current (1A) and package format (DO-214AA). These parts are active products suitable for direct replacement in applications where higher voltage margin is acceptable.

Manufacturer-Recommended Substitute (WeEn Semiconductors BT131W-600,135): This part represents a different TRIAC category (Logic - Sensitive Gate) with significantly lower gate trigger requirements (Igt 3mA max vs. 25mA, Ih 5mA max vs. 25mA). While rated for 600V and 1A, the sensitive gate characteristics and different package format (SC-73 vs. DO-214AA) require circuit-level evaluation. This substitute is manufacturer-recommended but introduces functional differences.

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement: Q4N4RP and Q6N4RP are preferred substitutes. Both maintain identical gate trigger specifications (Vgt 1.3V max, Igt 25mA max, Ih 25mA max) and package format (DO-214AA). Q4N4RP provides 400V rating with active product status and full compliance (RoHS3, REACH Unaffected). Q6N4RP provides 600V rating with identical compliance profile. Selection between these depends on required voltage margin in the application circuit.

For Sensitive Gate Applications: BT131W-600,135 is the manufacturer-recommended alternative when lower gate trigger current (3mA vs. 25mA) and hold current (5mA vs. 25mA) are beneficial. This part requires PCB layout modification due to different package format (SC-73 vs. DO-214AA) and introduces a lower temperature specification floor (125°C vs. -40°C to 125°C). Use only when gate drive circuit constraints or thermal requirements justify the package change.

Compliance Considerations: All substitute parts maintain RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Q4N4RP and Q6N4RP carry REACH Unaffected status, providing additional regulatory assurance for European applications.

Frequently Asked Questions (FAQ)

Q: Can Q4N4RP or Q6N4RP be used as direct replacements for Q2N4RP without circuit modification?

A: Yes, for applications where the original 200V rating is not a hard limit. Q4N4RP (400V) and Q6N4RP (600V) maintain identical gate trigger characteristics (Vgt 1.3V max, Igt 25mA max, Ih 25mA max) and package format (DO-214AA SMB 3-lead). No PCB layout changes are required. The higher voltage rating provides additional design margin without affecting gate drive circuit operation.

Q: What is the key difference between the Littelfuse Q-series substitutes and the WeEn BT131W-600,135?

A: The Littelfuse Q4N4RP and Q6N4RP are standard TRIACs with gate trigger specifications identical to the Q2N4RP (Igt 25mA max, Ih 25mA max). The WeEn BT131W-600,135 is a logic-sensitive gate TRIAC with significantly lower gate trigger current (Igt 3mA max, Ih 5mA max) and requires a different package footprint (SC-73 vs. DO-214AA). The sensitive gate design reduces gate drive power requirements but necessitates PCB redesign.

Q: Is the BT131W-600,135 a pin-compatible replacement?

A: No. While both are surface mount TRIACs with 1A on-state current, the BT131W-600,135 uses package SC-73 (TO-261-4, TO-261AA) versus the Q2N4RP's DO-214AA (SMB 3-lead) package. PCB layout modification is required for this substitution.

Q: What is the operating temperature range difference between substitutes?

A: Q2N4RP, Q4N4RP, and Q6N4RP all specify -40°C to 125°C (TJ). The BT131W-600,135 specifies only 125°C (TJ) maximum, without a stated minimum. Applications requiring operation below 0°C should use the Littelfuse Q-series substitutes.

Q: Are all substitutes RoHS compliant?

A: Yes. Q2N4RP, Q4N4RP, and Q6N4RP are RoHS3 Compliant. BT131W-600,135 is RoHS Compliant. All meet current regulatory requirements for lead-free manufacturing.

Q: Which substitute offers the best inventory availability?

A: Q4N4RP (892 Pcs), Q6N4RP (866 Pcs), and BT131W-600,135 (678 Pcs) are all active products with stock availability. Q4N4RP and Q6N4RP show higher inventory levels from the same manufacturer (Littelfuse Inc.).