S2055NTP Equivalent & Substitute Parts

Part Overview

The S2055NTP is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage and 55A RMS on-state current in a Surface Mount TO-263 (D2PAK) package, manufactured by Littelfuse Inc. This component is classified as Obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part maintains Standard Recovery characteristics suitable for general-purpose thyristor applications requiring controlled rectification and switching in power electronics circuits.

Substiute Parts

S2055NTP

Littelfuse Inc.In Stock: 874S2055NTP Datasheet

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S4055NTP

Littelfuse Inc.In Stock: 1171S4055NTP Datasheet

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S6055NTP

LittelfuseIn Stock: 1188S6055NTP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the S2055NTP is determined by the following critical parameters that must remain compatible:

• Package / Case: TO-263-3, D2PAK (2 Leads + Tab) — physical and electrical interface compatibility
• Mounting Type: Surface Mount — PCB assembly process compatibility
• SCR Type: Standard Recovery — switching characteristic compatibility
• Gate Trigger Parameters (Vgt Max: 1.5V, Igt Max: 40mA) — gate drive circuit compatibility
• On-State Voltage (Vtm Max: 1.8V) — thermal and power dissipation compatibility
• Operating Temperature Range: -40°C to 125°C — environmental operating envelope
• Current - On State (It RMS): 55A — current handling capacity

The substitute parts S4055NTP and S6055NTP share identical gate trigger characteristics, on-state voltage, hold current, package, mounting type, and operating temperature range. The primary difference is the off-state voltage rating, which increases from 200V (S2055NTP) to 400V (S4055NTP) and 600V (S6055NTP). Higher voltage-rated devices are electrically compatible in lower-voltage applications and provide enhanced voltage margin.

Parameter Comparison

Engineering Selection Recommendations

S4055NTP (400V Rating) — Recommended for applications where the circuit voltage may exceed 200V or where voltage margin is required. This part is in Active product status, ensuring long-term availability and supply chain stability. ROHS3 compliance and MSL Level 1 rating match the original specification.

S6055NTP (600V Rating) — Suitable for high-voltage applications or systems with significant voltage transients. This part is in Active product status with identical compliance certifications. The 600V rating provides maximum voltage headroom for circuits operating below 200V nominal.

Both substitute parts maintain electrical compatibility with gate drive circuits, thermal characteristics, and current handling capacity of the original S2055NTP. Selection between S4055NTP and S6055NTP depends on the maximum voltage the circuit will experience. For circuits designed for 200V operation with no transient overvoltage conditions, S4055NTP provides adequate margin. For circuits with potential voltage excursions or future design flexibility, S6055NTP is appropriate.

Frequently Asked Questions (FAQ)

Q: Can S4055NTP or S6055NTP be used as direct replacements for S2055NTP?

A: Yes. Both substitute parts share identical gate trigger voltage, gate trigger current, on-state voltage, hold current, operating temperature range, package configuration, and mounting type. The higher voltage ratings (400V and 600V) are compatible with 200V applications and provide additional voltage margin.

Q: What is the primary difference between the three parts?

A: The off-state voltage rating is the only electrical parameter that differs. S2055NTP is rated 200V, S4055NTP is rated 400V, and S6055NTP is rated 600V. All other electrical and mechanical characteristics are identical.

Q: Are there any thermal or current handling differences?

A: No. All three parts have identical on-state RMS current rating (55A), on-state voltage drop (1.8V maximum), and operating temperature range (-40°C to 125°C). Thermal performance and current capacity are equivalent.

Q: Why is S2055NTP marked as Obsolete?

A: The Obsolete status indicates the part is no longer in active production. S4055NTP and S6055NTP are Active products from the same manufacturer and series, providing continuity for new designs and production requirements.

Q: Are the package dimensions identical?

A: Yes. All three parts use TO-263-3 (D2PAK) package with 2 leads plus tab configuration. PCB footprints and assembly processes are identical.

Q: Do compliance certifications differ between the parts?

A: No. All three parts are ROHS3 compliant with MSL Level 1 (Unlimited moisture sensitivity). ECCN and HTSUS classifications are identical.