V250LT2P Equivalent & Substitute Parts

Part Overview

The V250LT2P is a 410 V, 1.2 kA varistor manufactured by Littelfuse in the LT series. This through-hole disc varistor (7mm) is designed for transient voltage suppression applications requiring single-circuit protection. The part is currently active in production with full inventory availability. Equivalent and substitute parts are identified when component availability changes, supply chain constraints occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

V250LT2P

LittelfuseIn Stock: 1129V250LT2P Datasheet

Current PartRFQ

B72207S0251K111

EPCOS - TDK ElectronicsIn Stock: 6353B72207S0251K111 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the V250LT2P is permissible with the B72207S0251K111 based on the following criteria:

• Varistor Voltage Range: The substitute part operates at 390 V typical, which falls within the acceptable tolerance band for 410 V applications. The varistor voltage minimum (351 V) and maximum (429 V) overlap with the main part's range (369 V to 451 V), ensuring functional compatibility in transient suppression circuits.
• Surge Current Rating: Both parts are rated for 1.2 kA surge current, providing identical protection capability.
• Maximum AC/DC Voltage: The substitute part is rated for 250 V AC and 320 V DC, which are compatible with the main part's 250 V AC and 330 V DC ratings.
• Mechanical Compatibility: Both parts use through-hole mounting with identical 7mm disc packaging, ensuring direct PCB footprint compatibility.
• Single Circuit Configuration: Both parts provide one circuit, maintaining circuit topology equivalence.
• Regulatory Compliance: Both parts are ROHS3 compliant and REACH unaffected, meeting the same environmental standards.

Parameter Comparison

Engineering Selection Recommendations

The B72207S0251K111 (EPCOS - TDK Electronics) is an active substitute for the V250LT2P based on the following engineering criteria:

• Product Status: Both parts are active in production, ensuring long-term availability and supply chain stability.
• Regulatory Compliance: Both parts meet ROHS3 requirements and are REACH unaffected, satisfying environmental and regulatory obligations.
• Electrical Compatibility: The substitute part's varistor voltage range (351 V to 429 V) overlaps with the main part (369 V to 451 V), providing functional equivalence in transient suppression circuits. The 5% typical voltage difference is within standard varistor tolerance bands.
• Mechanical Compatibility: Identical through-hole mounting and 7mm disc packaging ensure direct PCB compatibility without layout modifications.
• Surge Current: Both parts are rated for 1.2 kA, maintaining identical transient protection capability.

The substitute part has a lower energy rating (19 J versus 21 J) and lower maximum DC voltage (320 V versus 330 V). These differences should be evaluated in applications involving sustained high-energy transients or circuits operating near maximum DC voltage limits.

Frequently Asked Questions (FAQ)

Q: Can the B72207S0251K111 be used as a direct replacement for the V250LT2P?

A: Yes, the B72207S0251K111 is electrically and mechanically compatible for most applications. Both parts have identical surge current ratings (1.2 kA), matching AC voltage limits (250 V), and identical through-hole disc 7mm packaging. The varistor voltage difference (390 V typical versus 410 V typical) represents a 5% variation within standard varistor tolerance specifications.

Q: What are the key differences between these two parts?

A: The primary differences are: (1) Varistor voltage is 5% lower on the substitute (390 V vs. 410 V typical); (2) Maximum DC voltage is 3% lower (320 V vs. 330 V); (3) Energy rating is 10% lower (19 J vs. 21 J); (4) Operating temperature range differs, with the substitute supporting higher maximum temperature (105°C vs. 85°C) but lower minimum temperature (-40°C vs. -55°C); (5) Capacitance values are measured at different frequencies and cannot be directly compared.

Q: Are there any applications where the substitute should not be used?

A: The substitute part should be evaluated carefully in applications involving: (1) Circuits operating continuously near the 330 V DC maximum rating, where the 320 V limit of the substitute may be insufficient; (2) High-energy transient environments where the 21 J energy rating of the main part is required and the 19 J rating of the substitute is marginal; (3) Systems requiring operation below -40°C, where the substitute's minimum operating temperature limit is exceeded.

Q: Do both parts have the same packaging?

A: Both parts use through-hole mounting with 7mm disc packaging. However, the main part is supplied in Tape & Reel (TR) format, while the substitute is supplied in Cut Tape (CT) format. This affects handling and assembly processes but does not impact electrical or mechanical compatibility on the PCB.

Q: Are both parts RoHS and REACH compliant?

A: Yes, both the V250LT2P and B72207S0251K111 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: What is the varistor voltage tolerance, and how does it affect substitution?

A: Varistor voltage tolerance is typically ±10% for this product category. The main part has a typical voltage of 410 V (range 369 V to 451 V), while the substitute has a typical voltage of 390 V (range 351 V to 429 V). The overlapping ranges confirm functional compatibility for transient suppression applications.