2N6504G SCR Equivalent & Substitute Parts

Part Overview

The 2N6504G is a 50V, 25A standard recovery silicon controlled rectifier (SCR) manufactured by Littelfuse Inc. in TO-220AB through-hole packaging. This thyristor is designed for general-purpose AC switching and control applications requiring moderate voltage ratings and current handling capabilities. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance can be achieved within the allowed parameter tolerances for SCR devices, particularly when higher voltage ratings or improved electrical characteristics are required for specific application requirements.

Substiute Parts

2N6504G

Littelfuse Inc.In Stock: 25752N6504G Datasheet

Current PartRFQ

S4025RTP

LittelfuseIn Stock: 1765S4025RTP Datasheet

DirectRFQ

TYN625RG

STMicroelectronicsIn Stock: 1564TYN625RG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for SCR devices is determined by the following critical parameters:

• Voltage Rating (Off State): The substitute must equal or exceed the original voltage rating to ensure safe operation under maximum applied voltage conditions.
• Current Rating (It RMS): The substitute must equal or exceed the original RMS current rating to handle the intended load current.
• Gate Trigger Characteristics (Vgt, Igt): These parameters must remain within acceptable ranges to ensure reliable gate drive compatibility.
• On-State Voltage (Vtm): Lower or equivalent values indicate improved efficiency and reduced power dissipation.
• Package and Mounting: Physical compatibility with TO-220-3 through-hole mounting is required.
• SCR Type: Standard Recovery classification ensures consistent switching behavior.
• Temperature Range: Operating temperature compatibility must be maintained.
• Compliance Status: ROHS3 compliance and REACH unaffected status must be preserved.

The identified substitutes meet these criteria with the following distinctions:

S4025RTP (Littelfuse): Provides 400V off-state voltage rating with identical 25A RMS current capacity and compatible gate trigger parameters. Represents a higher voltage-rated alternative within the same manufacturer family.

TYN625RG (STMicroelectronics): Provides 600V off-state voltage rating with identical 25A RMS current capacity and improved electrical characteristics including lower gate trigger voltage and reduced off-state leakage current.

Parameter Comparison

Engineering Selection Recommendations

2N6504G Selection: Appropriate for applications with maximum applied voltages up to 50V and RMS currents up to 25A. Maintains active production status with full ROHS3 compliance and unlimited moisture sensitivity rating.

S4025RTP Selection: Suitable for applications requiring higher voltage withstand capability (400V) while maintaining identical current handling (25A RMS). Offers same-manufacturer continuity with equivalent gate drive requirements. ROHS3 compliant with unlimited MSL rating.

TYN625RG Selection: Suitable for applications requiring maximum voltage withstand capability (600V) with identical current handling (25A RMS). Provides improved electrical characteristics including lower gate trigger voltage (1.3V vs. 1.5V) and reduced off-state leakage current (5µA vs. 10µA). ROHS3 compliant with unlimited MSL rating.

All three parts maintain identical operating temperature range (-40°C to 125°C), TO-220-3 package compatibility, and standard recovery SCR classification. Selection between substitutes depends on the specific voltage rating requirement of the target application.

Frequently Asked Questions (FAQ)

Q: Can S4025RTP or TYN625RG be used as direct replacements for 2N6504G in existing designs?

A: Physical and electrical compatibility exists for gate drive and current handling. However, the higher voltage ratings (400V and 600V respectively) mean these parts are rated for higher applied voltages than the original 50V design. Substitution is valid only if the application circuit can accommodate the higher voltage rating without adverse effects.

Q: What is the difference between S4025RTP and TYN625RG?

A: Both provide higher voltage ratings than 2N6504G with identical 25A RMS current capacity. S4025RTP offers 400V rating from Littelfuse, while TYN625RG offers 600V rating from STMicroelectronics. TYN625RG provides lower gate trigger voltage (1.3V vs. 1.5V) and reduced off-state leakage current (5µA vs. 10µA).

Q: Are all three parts available in the same package?

A: Yes. All three parts use TO-220-3 through-hole packaging with compatible mechanical dimensions and pin configurations, enabling direct physical substitution on PCBs designed for TO-220AB or TO-220 mounting.

Q: Do all parts meet the same compliance requirements?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and carry unlimited moisture sensitivity level (MSL 1) ratings, ensuring equivalent regulatory and environmental compliance.

Q: What determines whether a substitute SCR is acceptable for my application?

A: The substitute must meet or exceed the original part's voltage and current ratings. Gate trigger parameters must be compatible with existing gate drive circuitry. Operating temperature range must cover the application environment. Package and mounting type must match the PCB design.