HVAC Capacitor Cross-Reference Chart

Quick rules: 440V can safely replace 370V (not vice versa). Round and oval are electrically identical if MFD and voltage match. Dual capacitors show Run/Fan (e.g., 35/5 = 35 MFD compressor + 5 MFD fan).

⚠ Safety first: Capacitors store a charge even with the power off. Before touching terminals, kill power at the disconnect AND discharge the capacitor — bridge the terminals with an insulated-handle screwdriver (or a 20kΩ resistor), then confirm 0V with a meter. Never handle a swollen or leaking capacitor by the terminals. Not sure? Bring it to the store — we test parts free.

Download the Full Spreadsheet (349 entries, filterable)

New: OEM Part Number Lookup (CSV, 97 verified numbers) — Lennox, Trane, Rheem, Carrier/Totaline, ICP/Heil/Tempstar, GE/Genteq, Aerovox, York, Goodman, Nordyne, Dayton & more.

Download .xlsx File

Supco: CR = single, CD = dual. Number = MFD. X + voltage. R suffix = round.

TradePro: TP-CAP-[MFD]/[voltage] for single. TP-CAP-[MFD1]/[MFD2]/[voltage] for dual. R = round.

Hartland: CAP-[MFD]/[voltage]. R = round. All 370/440V.

Totaline: P291-[digits]. Last digit: 3=370V, 4=440V. RS=round, S=oval.

TrueLine: 43-TL[MFD][voltage]-R (round) or -V (oval). Last digit: 3=370V, 4=440V.

Goodman: CAP + [fan MFD×10] + [comp MFD×10] + voltage. Suffix varies.

Titan HD: PRC=single round, POC=single oval, PRCD/POCD=dual. F=440V.

NGM (found in Goodman/Amana/Janitrol): Duals start with 328P: next digits are compressor µF then fan µF, then voltage code (37 = 370V, 44 = 440V). Watch the fan codes: 7D means 7.5 µF and 1Z means 12.5 µF. Example: 328P4505H44 = 45+5 µF, 440V.

Goodman CAP numbers: CAP + fan µF×10 + compressor µF×10 + voltage: CAP050450440 = 45+5 µF, 440V. Older Janitrol B9457-xxxx numbers don’t decode — look them up or bring the cap in.

Aerovox (Z-series): Digits 2–3 = case size, digits 5–6 = voltage, digits 7–8 = MFD, then M = exact value, N = fractional, W = dual. Full decoder and case-size table in the Aerovox cross-reference section below.

GE / Genteq (97F, Z97F, 27L): These numbers don’t encode ratings — they’re catalog lookups. The rating is printed on the can. Note: 97F9895 is a 45+5 µF 370V (a common online error lists it as 440V — a 440V replacement works fine either way).

York / Source 1: S1-024-xxxxx-xxx numbers don’t decode, and the same part appears with and without the S1- prefix and dashes. Read the µF and voltage off the can, or bring it in.

Dayton (Grainger): Five-character stock numbers (2MDV6, 2MEK7…) are catalog lookups — the rating is on the label.

Philips / Sprague / old Mallory: Legacy brands from decades-old equipment. Skip the part number entirely — the printed µF + VAC on the can is the cross-reference. (Modern Mallory PSU start caps do decode: PSU + starting µF + voltage code, e.g., PSU8815 = 88–106 µF at 110/125V.)

CBB65 / CBB60 / CBB61: Not a brand — a Chinese construction code (CBB65 = metal-can run capacitor, CBB61 = the square fan capacitor). The real rating is printed right next to it, e.g., “45+5μF 450VAC”. A 450V import is fine to replace with a 440V-rated cap of the same µF.

Aerovox Capacitor Cross-Reference Chart

Aerovox part numbers look like gibberish until you know they are a SuperMet code, and then they tell you everything — including the exact can size, which is the part that decides whether the replacement physically fits. If you have an Aerovox capacitor in your hand, decode it here and then match the MFD, voltage and can size against the tables above.

A correction we owe you. An earlier version of this page said Aerovox closed in 2018. That was wrong and we have taken it down. Aerovox Inc. filed Chapter 11 in 2001 and sold its US film-capacitor business to Parallax Power Components in 2002, but an operating Aerovox exists today in New Bedford, Massachusetts, with manufacturing in the US, China and India. What is true is that their public product line has moved toward industrial and medical film capacitors, and HVAC motor-run parts are no longer promoted — so most Aerovox cans coming across our counter are cross-referenced to a current brand.

How to read an Aerovox part number

The canonical form is Z 23 S 37 15 M 01 — series, case, impregnant, volts, MFD, rating character, descriptor.

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Aerovox case codes — round vs oval, and the size

Digits 2 and 3 tell you the can. This is what you actually need in order to know whether the replacement drops into the same bracket:

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Worked examples

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Older Aerovox numbers carry no code at all. All-numeric part numbers such as 1902017 predate the SuperMet system and cannot be decoded — read the MFD and voltage off the can face and match on those.

What you are replacing it with

Aerovox published their motor run capacitors at ±10% tolerance, −40 to +70°C, and 60,000 hours. That tolerance is looser than most of what is on the shelf today — Titan Pro, Titan HD and Supco are built to ±5%, Genteq and Totaline to ±6%. So crossing an Aerovox to a current brand at the same MFD and voltage is a tolerance upgrade, not a compromise. Match the MFD exactly, match or exceed the voltage, and match the can size from the code above.

Why two identical capacitors are not the same part

Every run capacitor from every major brand — Aerovox, Titan Pro, Titan HD, Genteq, Supco, AmRad, MARS, CDE — is self-healing metallized polypropylene film in an oil fill. The dielectric is not the differentiator. Neither is the shape, and neither is the number of spade terminals.

What actually differs is endurance class, and it is not printed anywhere a customer would look.

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Two more differences worth knowing, both published and both invisible on the shelf:

• Low-temperature rating. Most run capacitors are rated −40°C. Supco’s run caps are rated −25°C. Not a Dallas problem, but it tells you the parts are not built to one spec.
• Failure protection class. IEC calls it P0, P1 and P2. Only a P2 or EIA-456-A part is designed to fail open. A P0 part carries no failure protection at all, and the label does not make that obvious.
• Winding geometry. Two capacitors of identical rating can be wound from wide or narrow film. Same capacitance, same current draw, very different hot-spot temperature at the end spray. This is the actual physical reason two “identical” capacitors have different field lives.

Worth being straight about: we are a parts counter, not a laboratory. We have not bench-tested endurance classes against each other. The classes above come from the published standards and from manufacturer datasheets, and we are pointing at them because almost nobody selling capacitors mentions they exist.

AC capacitor replacement: what to match before you buy

Whether you are doing an air conditioner capacitor replacement on the condenser outside or an AC unit capacitor replacement on the blower inside, the same four things have to match. Everything else on the can is marketing.

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When is it actually bad?

The build tolerance and the replacement threshold are two different numbers, and the internet mixes them constantly. That is why the figures look contradictory everywhere you read.

• Build tolerance is how far off it left the factory — ±5% on a Titan Pro or Supco, ±6% on a Genteq or Totaline, ±10% on an Aerovox.
• Replacement threshold is 10% low. A 45 MFD capacitor reading below about 40.5 is done. Between 6% and 10% low it is still working but visibly aging, and if the panel is already open it is cheap insurance.
• Capacitance is not the only failure mode. A bulging can, oil weeping from the seam, or a terminal that has lost continuity condemns a capacitor that still reads perfectly in tolerance. Some fail high rather than low.

Bring it in and we will test it on the counter for free before you buy anything — that goes for capacitors, contactors, motors, ignitors, relays and transformers.

Need a Capacitor?

Open To Public HVAC Parts stocks motor run capacitors, contactors, fan motors, and more at our Dallas warehouse. Browse our catalog or contact us for help finding the right part.