SMQ250VS681M25X35T2 Equivalent & Substitute Parts

Part Overview

The SMQ250VS681M25X35T2 is a 680 µF, 250 V aluminum electrolytic capacitor manufactured by Chemi-Con in the SMQ series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring stable capacitance and extended operational life. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility with existing circuit designs.

Substiute Parts

SMQ250VS681M25X35T2

Chemi-ConIn Stock: 739SMQ250VS681M25X35T2 Datasheet

Current PartRFQ

ESMQ251VSN681MQ35S

Chemi-ConIn Stock: 1496ESMQ251VSN681MQ35S Datasheet

SimilarRFQ

380LQ681M250J032

Cornell Dubilier Electronics (CDE)In Stock: 850380LQ681M250J032 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMQ250VS681M25X35T2 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Capacitance: 680 µF (exact match required)
• Voltage Rating: 250 V (exact match required)
• Tolerance: ±20% (exact match required)
• Package Type: Radial, Can - Snap-In (exact match required)
• Mounting Type: Through Hole (exact match required)
• Lead Spacing: 0.394" (10.00 mm) (exact match required)
• Polarization: Polar (exact match required)

Allowable Variation Parameters:

• ESR: Values within the operational range of the circuit design
• Operating Temperature Range: Equal to or broader than the original specification
• Ripple Current Ratings: Equal to or greater than the original specification
• Physical Dimensions (Diameter/Height): Variations acceptable if mechanical fit is verified for the specific application
• RoHS/REACH Compliance: Enhanced compliance acceptable for modern designs

Two substitute parts meet these criteria and are identified as direct equivalents.

Parameter Comparison

Engineering Selection Recommendations

ESMQ251VSN681MQ35S (Chemi-Con) is the primary recommended substitute. This part maintains identical electrical specifications and physical dimensions to the original SMQ250VS681M25X35T2. The ESMQ251VSN681MQ35S is manufactured by the same supplier (Chemi-Con) and carries active product status with RoHS compliance certification. The part is available in bulk packaging with 1413 units in stock. Selection of this part eliminates design re-qualification requirements and ensures direct mechanical and electrical compatibility.

380LQ681M250J032 (Cornell Dubilier Electronics) is an alternative substitute suitable for applications where extended operating temperature range (-40°C ~ 85°C) is required. This part exhibits lower ESR (293 mOhm @ 120 Hz) compared to the original specification, which may provide performance benefits in ripple current applications. Physical dimensions vary slightly (diameter 0.984" vs. 1.000", height 1.457" vs. 1.378"), requiring verification of mechanical fit within the target PCB layout. The part carries ROHS3 compliance and active product status with 794 units in stock.

Both substitute parts satisfy the critical electrical parameters (capacitance, voltage, tolerance, ripple current, lifetime) and maintain the required package configuration (radial, can-style, snap-in, through-hole mounting). Selection between these alternatives depends on specific application requirements regarding temperature range, physical space constraints, and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can ESMQ251VSN681MQ35S be used as a direct replacement for SMQ250VS681M25X35T2 without PCB modification?

A: Yes. The ESMQ251VSN681MQ35S maintains identical lead spacing (0.394" / 10.00 mm), diameter (1.000" / 25.40 mm), and height (1.378" / 35.00 mm). No PCB layout changes are required for this substitution.

Q: What is the difference in ESR between the original part and the 380LQ681M250J032 substitute?

A: The original SMQ250VS681M25X35T2 specifies 366 mOhm @ 120 Hz. The 380LQ681M250J032 specifies 293 mOhm @ 120 Hz, representing a 20% reduction in equivalent series resistance. Lower ESR reduces heat generation and improves performance in high-ripple-current applications.

Q: Does the 380LQ681M250J032 require PCB modification due to dimensional differences?

A: The 380LQ681M250J032 has a diameter of 0.984" (25.00 mm) versus 1.000" (25.40 mm) for the original part, and a height of 1.457" (37.00 mm) versus 1.378" (35.00 mm). Mechanical fit verification is required for the specific PCB layout. Lead spacing remains identical at 0.394" (10.00 mm).

Q: Are both substitute parts RoHS compliant?

A: Yes. ESMQ251VSN681MQ35S carries RoHS compliance certification. 380LQ681M250J032 carries ROHS3 compliance certification. The original SMQ250VS681M25X35T2 is RoHS non-compliant.

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

A: The original SMQ250VS681M25X35T2 and ESMQ251VSN681MQ35S both specify -25°C ~ 85°C. The 380LQ681M250J032 specifies -40°C ~ 85°C, providing extended low-temperature operation capability.

Q: Can ripple current ratings be compared directly between the three parts?

A: Ripple current specifications vary by frequency. All three parts specify 2.5 A @ 120 Hz. At high frequency, the original and ESMQ251VSN681MQ35S specify 3.75 A @ 50 kHz, while the 380LQ681M250J032 specifies 3.5 A @ 20 kHz. Application-specific frequency requirements determine the appropriate selection.

Q: What inventory availability exists for these substitute parts?

A: ESMQ251VSN681MQ35S: 1413 units in stock. 380LQ681M250J032: 794 units in stock. Both parts are available as new original components.