The Cornell Dubilier Electronics THAS401M150AC0C is a 400 µF aluminum electrolytic capacitor rated for 150 V operation, designed in a through-hole FlatPack configuration that measures 2.118" L x 1.000" W x 0.366" H (53.80mm x 25.40mm x 9.30mm). This polar capacitor from the THAS series delivers reliable energy storage and filtering performance across general-purpose applications where space efficiency and thermal endurance converge.
With an equivalent series resistance of 470 mOhm at 120 Hz, this component exhibits favorable AC characteristics for smoothing and decoupling functions in power supply circuits. The capacitor handles ripple currents of 1 A at 120 Hz and 1.7 A at 20 kHz, enabling effective operation in both line-frequency rectification and switched-mode power conversion topologies. The ±20% tolerance provides adequate margin for applications where exact capacitance values can be accommodated through circuit design.
The THAS401M150AC0C operates reliably across a temperature range of -55°C to 105°C, with a rated lifetime of 5000 hours at maximum operating temperature. This endurance specification positions the capacitor for industrial environments and equipment requiring extended service intervals without premature degradation. The 10.00mm lead spacing facilitates standard PCB mounting practices and accommodates automated assembly processes in high-volume production.
This aluminum electrolytic capacitor through-hole design serves power filtering, bulk energy storage, and timing applications in industrial controls, motor drives, power inverters, and consumer electronics. The FlatPack form factor offers a lower profile compared to radial configurations, beneficial where vertical clearance constraints exist or when reducing overall assembly height improves mechanical integration. The component's voltage rating supports use in both line-powered equipment and intermediate voltage bus architectures.
Manufactured to RoHS3 compliance standards and classified as REACH Unaffected, the THAS401M150AC0C meets current environmental directives for global market distribution. The bulk packaging format accommodates procurement for prototype development, small-batch production, or maintenance inventory. Cornell Dubilier's active production status ensures ongoing availability for designs requiring long-term component sourcing stability.
THAS401M150AC0C (1)
Replacement pressure around CDE THAS401M150AC0C 400 µF 150 V FlatPack capacitors
Finding a THAS401M150AC0C replacement is not only a matter of matching “400 µF, 150 V.” This Cornell Dubilier Electronics aluminum electrolytic capacitor uses a low-profile FlatPack through-hole format, which makes mechanical fit, ripple-current handling, ESR, temperature rating, and lead geometry part of the substitution decision. A cylindrical radial or snap-in capacitor may meet the electrical rating but still require PCB layout changes, enclosure clearance checks, or vibration review.
Potential equivalent and alternative part numbers to evaluate include:
| Replacement Type | Candidate Part Number | Manufacturer | General Replacement Position |
|---|---|---|---|
| Same part | THAS401M150AC0C | Cornell Dubilier Electronics, CDE | Preferred like-for-like replacement |
| Same CDE flatpack family candidate |
MLS401M150EK0C
Cornell Dubilier Electronics (CDE)
CAP ALUM 400UF 20% 150V FLATPACK
3370
| Cornell Dubilier Electronics, CDE | Flatpack-style alternative requiring datasheet footprint verification |
| Higher-voltage CDE redesign candidate | 381LX391M160A052 | Cornell Dubilier Electronics, CDE | 390 µF, 160 V-class cylindrical alternative |
| General-purpose snap-in alternative | LGU2C391MELB | Nichicon | 390 µF, 160 V-class alternative for redesigned boards |
| Industrial snap-in alternative | EET-UQ2C391EA | Panasonic | 390 µF, 160 V-class alternative where cylindrical mounting is acceptable |
| Higher-voltage margin candidate |
EKMQ201VSN391MP25S
United Chemi-Con
CAP ALUM 390UF 20% 200V SNAP
18493
| United Chemi-Con | 390 µF, 200 V-class alternative for voltage-margin redesigns |
Because the original capacitor is a FlatPack component with a 9.30 mm seated height, direct replacement options are narrower than standard radial electrolytic capacitors. The strongest replacement path is usually: first confirm availability of THAS401M150AC0C, then evaluate CDE flatpack alternatives such as
MLS401M150EK0C
, and only then consider cylindrical snap-in or radial redesign candidates such as 381LX391M160A052, LGU2C391MELB, EET-UQ2C391EA, or
MLS401M150EK0C
Cornell Dubilier Electronics (CDE)
CAP ALUM 400UF 20% 150V FLATPACK
3370
EKMQ201VSN391MP25S
.
EKMQ201VSN391MP25S
United Chemi-Con
CAP ALUM 390UF 20% 200V SNAP
18493
What the Cornell Dubilier Electronics THAS401M150AC0C design establishes for substitution
The Cornell Dubilier Electronics THAS401M150AC0C is a polarized aluminum electrolytic capacitor rated at 400 µF, 150 V, with ±20% capacitance tolerance. Its ESR is specified as 470 mΩ at 120 Hz, with ripple-current ratings of 1 A at 120 Hz and 1.7 A at 20 kHz. It is rated for 5000 hours at 105°C and operates across -55°C to 105°C.
| Parameter | THAS401M150AC0C Value | Replacement Relevance |
|---|---|---|
| Capacitance | 400 µF | 390 µF alternatives may be acceptable because they fall within the original ±20% tolerance range, but circuit timing, hold-up energy, and ripple voltage should be checked. |
| Rated voltage | 150 V | Replacement voltage should be 150 V or higher. 160 V parts are common alternatives; 200 V parts add margin but may be larger. |
| ESR | 470 mΩ at 120 Hz | Lower ESR can reduce heating but may affect damping in some power circuits. Higher ESR may increase ripple voltage and temperature rise. |
| Ripple current | 1 A at 120 Hz, 1.7 A at 20 kHz | Replacement parts must handle the actual RMS ripple current at the operating frequency and ambient temperature. |
| Lifetime | 5000 h at 105°C | Replacement life should be evaluated using actual core temperature, not only catalog life. |
| Mounting style | Through-hole FlatPack | The strongest mechanical constraint. Cylindrical alternatives are usually redesign options, not drop-in substitutes. |
| Size | 53.80 mm x 25.40 mm, 9.30 mm max height | Low height may be required in compact power modules, aerospace-style assemblies, or boards with limited clearance. |
| Lead spacing | 10.00 mm | Any equivalent must match or be adaptable to the PCB hole pattern. |
| Compliance | RoHS3 compliant, REACH unaffected | Compliance status should be maintained when qualifying replacements. |
The FlatPack case is the defining characteristic of THAS401M150AC0C. In many applications, the capacitor is selected not only for energy storage but also because it fits into a low-profile mechanical envelope. Typical uses include DC-link support, hold-up capacitance, filtering in industrial power supplies, compact converter assemblies, and general-purpose bulk capacitance where board height is constrained.
For replacement decisions, the capacitor’s electrical ratings define the safe operating window, while its package defines whether the substitute can be installed without redesign. A 390 µF 160 V snap-in capacitor may be electrically reasonable, but it cannot be treated as a pin-compatible THAS401M150AC0C equivalent unless the board and enclosure are modified.
Candidate equivalent and alternative part numbers for THAS401M150AC0C replacement review
The following table compares practical replacement candidates. Some are closer electrical substitutes, while others are redesign alternatives where availability, voltage margin, or package preference may justify PCB changes.
| Manufacturer | Part Number | Key Specifications | Product Features | Typical Applications | Why It Can Replace the Original Part | Main Differences or Limitations | Recommended Usage |
|---|---|---|---|---|---|---|---|
| Cornell Dubilier Electronics, CDE | THAS401M150AC0C | 400 µF, 150 V, ±20%, 470 mΩ ESR at 120 Hz, 5000 h at 105°C, FlatPack through-hole | Original THAS low-profile aluminum electrolytic capacitor | Compact power supplies, DC filtering, hold-up circuits, low-height assemblies | It is the original manufacturer part number and preserves the intended electrical, mechanical, and compliance profile | Availability, lead time, and lot continuity still need confirmation | First-choice replacement when direct fit and original qualification must be preserved |
| Cornell Dubilier Electronics, CDE |
MLS401M150EK0C
Cornell Dubilier Electronics (CDE)
CAP ALUM 400UF 20% 150V FLATPACK
3370
| 400 µF, 150 V-class aluminum electrolytic flatpack candidate; exact ESR, ripple, dimensions, and suffix-defined construction must be verified | CDE flatpack-style capacitor family aimed at space-constrained power designs | Low-profile power electronics, military/industrial-style assemblies, compact DC bus filtering | Same nominal capacitance and voltage class, with a flatpack form factor closer to THAS401M150AC0C than cylindrical capacitors | Not automatically pin-compatible; footprint, height, lead configuration, ESR, ripple, and lifetime may differ from THAS401M150AC0C | Best evaluated when a flatpack package is required but the exact THAS part is unavailable |
| Cornell Dubilier Electronics, CDE | 381LX391M160A052 | 390 µF, 160 V-class aluminum electrolytic capacitor candidate; cylindrical construction | Higher-voltage class alternative with capacitance close to 400 µF | Power supply bulk storage, DC-link filtering, industrial equipment | 390 µF is within the original ±20% capacitance tolerance, and 160 V exceeds the original 150 V rating | Cylindrical package is not a FlatPack replacement; PCB mounting, height, and vibration retention require redesign | Suitable for redesigns where CDE sourcing is preferred and mechanical height is not constrained |
| Nichicon | LGU2C391MELB | 390 µF, 160 V-class aluminum electrolytic capacitor candidate | General-purpose/high-ripple snap-in style depending on exact series configuration | AC/DC power supplies, converter input filtering, industrial control power stages | Electrical class is close: 390 µF capacitance and 160 V rating can cover many 400 µF 150 V applications | Not pin-compatible with THAS401M150AC0C; ESR, ripple current, diameter, height, and snap-in terminals must be checked | Good redesign candidate where Nichicon supply chain preference or standard snap-in mounting is acceptable |
| Panasonic | EET-UQ2C391EA | 390 µF, 160 V-class aluminum electrolytic capacitor candidate | Industrial aluminum electrolytic format; verify current datasheet for ripple and endurance | Power converters, bus capacitors, general DC filtering | Capacitance is close to 400 µF and voltage rating is above 150 V, making it electrically plausible after thermal and ripple review | Mechanical format differs from CDE FlatPack; may increase height and require new PCB holes | Consider for cost, availability, or Panasonic-approved BOM redesigns |
| United Chemi-Con |
EKMQ201VSN391MP25S
United Chemi-Con
CAP ALUM 390UF 20% 200V SNAP
18493
| 390 µF, 200 V-class aluminum electrolytic capacitor candidate | Higher-voltage-margin cylindrical capacitor option | DC bus filtering, higher-voltage power supplies, derated industrial designs | 200 V rating provides additional voltage margin; 390 µF remains within the original tolerance band | Larger size is likely compared with 150 V or 160 V parts; ESR and ripple behavior may differ; not a direct mechanical equivalent | Use when additional voltage derating is desired and the enclosure can accept a taller cylindrical capacitor |
The closest replacement path remains THAS401M150AC0C itself.
MLS401M150EK0C
is the most relevant alternative when a low-profile flatpack solution is required, but it still needs careful package and land-pattern review. The cylindrical alternatives — 381LX391M160A052, LGU2C391MELB, EET-UQ2C391EA, and
MLS401M150EK0C
Cornell Dubilier Electronics (CDE)
CAP ALUM 400UF 20% 150V FLATPACK
3370
EKMQ201VSN391MP25S
— are better treated as redesign candidates rather than drop-in replacements.
EKMQ201VSN391MP25S
United Chemi-Con
CAP ALUM 390UF 20% 200V SNAP
18493
Engineering trade-offs when choosing a THAS401M150AC0C equivalent or redesign alternative
Replacement selection should begin with the circuit function. If THAS401M150AC0C is used for bulk hold-up capacitance, a 390 µF alternative may be acceptable after verifying discharge time, minimum bus voltage, and energy storage. If it is used in a ripple-heavy power stage, ESR, ripple-current rating, and internal temperature rise become the deciding factors. If the board relies on the FlatPack height, cylindrical alternatives may be rejected even when their electrical ratings look suitable.
| Decision Factor | THAS401M150AC0C | MLS401M150EK0C | 381LX391M160A052 | LGU2C391MELB | EET-UQ2C391EA | EKMQ201VSN391MP25S |
|---|---|---|---|---|---|---|
| Electrical compatibility | Baseline: 400 µF, 150 V | Potentially close due to same nominal 400 µF, 150 V class | 390 µF, 160 V class is generally compatible after circuit verification | 390 µF, 160 V class is generally compatible after circuit verification | 390 µF, 160 V class is generally compatible after circuit verification | 390 µF, 200 V class offers additional voltage margin |
| Mechanical compatibility | Direct fit for original PCB | Possible flatpack-compatible candidate, but footprint must be confirmed | Not mechanically equivalent; cylindrical package | Not mechanically equivalent; snap-in/radial style must be verified | Not mechanically equivalent; cylindrical format | Not mechanically equivalent; likely larger due to 200 V rating |
| Performance differences | Known ESR, ripple, life, and height | May offer similar function but must be checked for ESR, ripple, and endurance | May provide different ESR and ripple behavior; thermal validation needed | Series-dependent ESR and ripple performance; suitable for redesigned power boards | Good redesign candidate if ripple and endurance match application needs | Higher voltage derating may improve operating margin but can increase size and cost |
| Reliability considerations | Original qualification path is preserved | Could be suitable if CDE flatpack family reliability meets system requirements | Requires new thermal, vibration, and mounting review | Requires supplier qualification and ripple-temperature validation | Requires supplier qualification and mechanical review | Higher voltage margin helps derating, but mechanical stress and mounting must be assessed |
| Package availability | Bulk FlatPack through-hole | Flatpack availability depends on distributor and suffix | Standard cylindrical availability may be easier | Broad industrial capacitor sourcing may be possible | Often suitable for alternate-source BOM strategies | Useful when 200 V parts are easier to source or derating is preferred |
| Cost considerations | May carry premium due to specialized FlatPack format | May also carry premium if flatpack construction is specialized | Could reduce cost in redesigned boards | Often competitive for standard capacitor formats | Often competitive depending on supply | May cost more due to higher voltage rating and larger size |
| Best-fit scenario | Maintenance, repair, or production continuation without redesign | Low-profile redesign or alternate CDE flatpack qualification | Board redesign with preference for CDE cylindrical capacitors | Standardized snap-in capacitor redesign | Panasonic-based approved vendor list or cost-driven redesign | Designs needing extra voltage margin and available enclosure space |
| Main limitation | Supply availability may drive alternate search | Not confirmed as drop-in without datasheet comparison | Height and lead pattern mismatch | Mechanical mismatch with original FlatPack | Mechanical mismatch with original FlatPack | Largest redesign impact among listed candidates |
For a no-layout-change replacement, THAS401M150AC0C is the proper target. For a low-profile alternative,
MLS401M150EK0C
deserves evaluation before moving to cylindrical capacitors. For redesigned assemblies, 381LX391M160A052, LGU2C391MELB, and EET-UQ2C391EA are practical 390 µF, 160 V-class candidates.
MLS401M150EK0C
Cornell Dubilier Electronics (CDE)
CAP ALUM 400UF 20% 150V FLATPACK
3370
EKMQ201VSN391MP25S
is more appropriate when a higher 200 V rating supports derating goals and the mechanical envelope allows it.
EKMQ201VSN391MP25S
United Chemi-Con
CAP ALUM 390UF 20% 200V SNAP
18493
Before approving any THAS401M150AC0C equivalent, compare the latest manufacturer datasheets for case size, lead spacing, polarity marking, ESR, ripple current, endurance, and compliance status. For pricing and availability of THAS401M150AC0C replacement parts or alternative capacitor sourcing, request quotations through IC-Components.com or email Info@IC-Components.com.
