2N6403G Equivalent & Substitute Parts

Part Overview

The 2N6403G is a silicon-controlled rectifier (SCR) manufactured by Littelfuse, rated for 400V off-state voltage with 16A RMS on-state current in a TO-220AB through-hole package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified when applications require alternative sourcing due to inventory constraints, lead time considerations, or specific performance requirements within the allowed electrical and mechanical parameter ranges for standard recovery thyristors.

Substiute Parts

2N6403G

LittelfuseIn Stock: 16072N6403G Datasheet

Current PartRFQ

S4055RTP

Littelfuse Inc.In Stock: 1394S4055RTP Datasheet

MFR RecommendedRFQ

TYN616RG

STMicroelectronicsIn Stock: 28563TYN616RG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 2N6403G is determined by the following criteria:

Electrical Compatibility Parameters:

• Off-state voltage rating must be equal to or greater than 400V
• On-state current (RMS) must be equal to or greater than 16A
• Gate trigger voltage and current must fall within acceptable ranges for standard recovery SCRs
• Operating temperature range must encompass -40°C to 125°C

Mechanical Compatibility Parameters:

• Package type must be TO-220-3 or compatible through-hole variant
• Mounting configuration must be through-hole

Compliance Requirements:

• Product status must be Active
• RoHS3 compliance required
• Moisture sensitivity level MSL 1 (Unlimited)

Two substitute parts meet these criteria: the S4055RTP (Littelfuse, 400V 55A) and the TYN616RG (STMicroelectronics, 600V 16A). Both are standard recovery SCRs in TO-220 packages with Active product status and full RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

S4055RTP (Littelfuse Inc.): This substitute maintains identical off-state voltage (400V) and gate trigger voltage (1.5V) specifications. The on-state current rating of 55A RMS exceeds the 16A requirement, providing increased current handling capacity. All electrical parameters remain within acceptable ranges for standard recovery operation. Product status is Active with full RoHS3 compliance. The TO-220AB-R package variant is mechanically compatible with through-hole mounting applications.

TYN616RG (STMicroelectronics): This substitute provides a higher off-state voltage rating of 600V, exceeding the 400V specification. On-state current rating matches the 16A RMS requirement exactly. Gate trigger voltage remains at 1.5V. Off-state leakage current is reduced to 5µA compared to 10µA in the main part. Product status is Active with full RoHS3 compliance. The TO-220 package is mechanically compatible with through-hole mounting applications.

Both substitutes maintain Active product status and full regulatory compliance (RoHS3, REACH Unaffected, EAR99 classification). Selection between substitutes depends on application-specific requirements for voltage margin and current capacity.

Frequently Asked Questions (FAQ)

Q: Can the S4055RTP replace the 2N6403G in all applications?

A: The S4055RTP is electrically compatible for applications requiring 400V off-state voltage and up to 16A RMS on-state current. The higher current rating (55A) does not prevent substitution in lower-current applications. Mechanical compatibility is confirmed through TO-220 package compatibility. Verify circuit design does not depend on specific current limitations of the original part.

Q: What is the primary difference between the TYN616RG and the 2N6403G?

A: The TYN616RG provides a 600V off-state voltage rating compared to the 2N6403G's 400V rating. On-state current ratings are identical at 16A RMS. The higher voltage rating of the TYN616RG allows operation in higher-voltage applications while maintaining compatibility in 400V circuits. Both parts share identical gate trigger voltage specifications and operating temperature ranges.

Q: Are there packaging differences between these substitutes?

A: All three parts use TO-220 package variants suitable for through-hole mounting. The 2N6403G uses TO-220AB packaging, the S4055RTP uses TO-220AB-R packaging, and the TYN616RG uses standard TO-220 packaging. These variants are mechanically interchangeable in through-hole PCB applications.

Q: Do all substitutes meet the same compliance requirements?

A: Yes. The 2N6403G, S4055RTP, and TYN616RG are all ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level is MSL 1 (Unlimited) for all three parts. All parts maintain Active product status.

Q: Which substitute should be selected for maximum voltage margin?

A: The TYN616RG provides the highest off-state voltage rating at 600V, offering a 200V margin above the 400V specification. This selection is appropriate for applications requiring enhanced voltage headroom or operating in variable voltage environments.

Q: Which substitute should be selected for higher current capacity?

A: The S4055RTP provides the highest on-state current rating at 55A RMS, compared to 16A RMS for both the 2N6403G and TYN616RG. This selection is appropriate for applications requiring current handling beyond 16A while maintaining 400V voltage specifications.