688LMB050M2ED Equivalent & Substitute Parts Reference

Part Overview

The 688LMB050M2ED is a 6800 µF, 50 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LMB series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring high capacitance in a compact through-hole package. The part is currently active in production with 693 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative performance characteristics are required.

Substiute Parts

688LMB050M2ED

Cornell Dubilier / Illinois CapacitorIn Stock: 704688LMB050M2ED Datasheet

Current PartRFQ

LGY1H682MELC30

NichiconIn Stock: 1495LGY1H682MELC30 Datasheet

UpgradeRFQ

381LX682M050A022

Cornell Dubilier Electronics (CDE)In Stock: 4991381LX682M050A022 Datasheet

Parametric EquivalentRFQ

LGU1H682MELC

NichiconIn Stock: 1003LGU1H682MELC Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 688LMB050M2ED is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 6800 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage - Rated: 50 V (exact match required)
• Package / Case: Radial, Can - Snap-In (exact match required)
• Lead Spacing: 0.394" (10.00mm) (exact match required)
• Size / Dimension: 1.378" Dia (35.00mm) (exact match required)
• Height - Seated (Max): 1.260" (32.00mm) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -40°C ~ 105°C (exact match required)
• Polarization: Polar (exact match required)

Compliance Parameters:

• RoHS Status: ROHS3 Compliant (required for regulatory alignment)
• REACH Status: REACH Unaffected (required for regulatory alignment)

All identified substitute parts meet these mandatory criteria. Variations in secondary parameters such as ESR, ripple current ratings, and lifetime specifications do not disqualify substitution but indicate performance differences that may affect circuit behavior in ripple-current-sensitive applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (688LMB050M2ED - Cornell Dubilier LMB Series): Use the original part number when available. This part is active in production, ROHS3 compliant, and REACH unaffected. It provides specified ESR and ripple current performance at 120 Hz and 10 kHz.

Upgrade Selection (LGY1H682MELC30 - Nichicon LGY Series): This substitute offers extended lifetime of 5000 hours at 105°C compared to the 3000-hour rating of the primary part. Select this part when enhanced reliability over extended operating periods is required. ROHS3 compliant and REACH unaffected. Note that ripple current ratings are lower than the primary part; verify circuit ripple current requirements do not exceed 2.5 A @ 120 Hz or 2.875 A @ 50 kHz.

Parametric Equivalent Selection (381LX682M050A022 - Cornell Dubilier Electronics 381LX Series): This part maintains identical lifetime (3000 Hrs @ 105°C) and similar ripple current performance to the primary part. It is manufactured by Cornell Dubilier Electronics, ensuring design continuity within the same manufacturer family. ROHS3 compliant and REACH unaffected. Highest inventory availability (4910 units) supports procurement continuity.

Parametric Equivalent Selection (LGU1H682MELC - Nichicon LGU Series): This substitute provides equivalent lifetime (3000 Hrs @ 105°C) and ripple current performance closely matching the primary part. ROHS3 compliant and REACH unaffected. Select when Nichicon sourcing is preferred or when primary and 381LX alternatives are unavailable.

All substitute parts are active in production and meet regulatory compliance requirements. Selection among equivalents should be based on inventory availability, supply chain preferences, and specific ripple current requirements of the application circuit.

Frequently Asked Questions (FAQ)

Q: Can LGY1H682MELC30 be used as a direct replacement for 688LMB050M2ED?

A: Yes, LGY1H682MELC30 is a direct mechanical and electrical substitute. All critical parameters including capacitance, voltage rating, package dimensions, and lead spacing are identical. The primary difference is extended lifetime (5000 Hrs vs. 3000 Hrs @ 105°C) and lower ripple current ratings. Verify that circuit ripple current does not exceed 2.5 A @ 120 Hz or 2.875 A @ 50 kHz before substitution.

Q: What is the difference between the two Nichicon parts (LGY1H682MELC30 and LGU1H682MELC)?

A: Both are Nichicon 6800 µF, 50 V snap-in capacitors with identical mechanical dimensions and mounting characteristics. LGY1H682MELC30 offers 5000-hour lifetime at 105°C with lower ripple current capacity (2.5 A @ 120 Hz). LGU1H682MELC provides 3000-hour lifetime with higher ripple current capacity (3.31 A @ 120 Hz), more closely matching the original part's performance profile.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts (LGY1H682MELC30, 381LX682M050A022, and LGU1H682MELC) are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

Q: Can these parts be used interchangeably in high-ripple-current applications?

A: No. Ripple current ratings vary among the substitutes. The original 688LMB050M2ED supports 3.25 A @ 120 Hz and 4.0625 A @ 10 kHz. LGY1H682MELC30 supports only 2.5 A @ 120 Hz and 2.875 A @ 50 kHz. For applications requiring ripple current above 2.5 A @ 120 Hz, use 381LX682M050A022 (3.3 A @ 120 Hz) or LGU1H682MELC (3.31 A @ 120 Hz).

Q: What is the physical footprint compatibility?

A: All parts share identical mechanical specifications: 1.378" diameter (35.00mm), 1.260" maximum seated height (32.00mm), and 0.394" lead spacing (10.00mm). All are radial, can-style snap-in packages with through-hole mounting. Direct PCB footprint compatibility is confirmed.

Q: Which substitute offers the best long-term reliability?

A: LGY1H682MELC30 provides the longest specified lifetime at 5000 hours @ 105°C, compared to 3000 hours for all other parts. Select this part for applications requiring extended operational life under sustained elevated temperature conditions.

Q: Is ESR (Equivalent Series Resistance) a critical factor in selecting a substitute?

A: ESR is specified only for the primary part (85.33 mOhm @ 120 Hz). Substitute parts do not provide ESR specifications in the available data. If ESR performance is critical to circuit function, contact the substitute manufacturer for detailed ESR specifications before substitution.