2CL2FM Part Review
Worked for 3 mins 9 sec
The part already has a Datasheet URL set, so I’m using that source for the cross-check rather than changing the property.
Worked for 12 mins 11 sec
Created a project doc
Reviewed the 2CL2FM part info and created the detailed report: 2CL2FM Part Review. The Datasheet URL was already set, so I did not overwrite it.
Open items:
- Pin metadata is incomplete: Pin 1/2 should be explicitly Cathode/Anode and Passive.
- High-voltage creepage/clearance warning should be added for 20 kV use.
- Reverse-current units should be manually verified from the PDF image before encoding leakage-current properties.
Suggested next steps:
- Update pin descriptions and pin types.
- Add a high-voltage layout/clearance warning note to the part.
- Confirm the schematic artwork shows the cathode bar on the pin-1 side.
Fix pins and notes
Update pin metadata
Add HV warning
Verify cathode artwork
Run part review
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Ask about this doc
2CL2FM Part Review
Date: 2026-07-20
Project: silicon-yard/2cl2fm
Scope
Reviewed available part metadata, schematic terminals, footprint geometry, pin descriptions, and datasheet information for the 2CL2FM medium-power high-voltage silicon diode.
Available Part Information
Table
| Field | Current value found |
|---|---|
| Manufacturer Part Number | 2CL2FM |
| Manufacturer | HVCA / HV Component Associates |
| Part Type | Diode |
| Designator Prefix | D |
| Description | Medium Power High Voltage Silicon Diode; High Voltage Power Diode, standard and ultra-fast recovery; Power diode with axial leads |
| Package | Axial leads |
| Pin count | 2 |
| Datasheet URL | 1736d6c107682f668bc81dcc3768b4e597e34bca0f95021c1449cd188366d493.pdf |
| Footprint asset | DIOAD3244W81L1524D430.kicad_mod |
| 3D model asset | 2CL2FM.stp |
| Symbol asset | 2CL2FM Symbol.svg |
The Datasheet URL was already populated, so I did not overwrite it. Web search did not find a current direct HVCA-hosted 2CL2FM datasheet page; public mirrors and alternate manufacturer pages exist, with some conflicting package/spec values.
Datasheet-Derived Key Specs
From the datasheet currently attached to the part:
Table
| Parameter | Value |
|---|---|
| Function | Medium-power high-voltage silicon diode; standard / ultra-fast recovery family |
| VRRM, repetitive peak reverse voltage | 20,000 V |
| IFAVM, average forward current | 0.10 A at TA = 40 °C; 0.22 A at TOIL = 55 °C |
| IFSM, single-cycle surge current | 10 A |
| VF, forward voltage drop | 35.0 V max at IF = 100 mA, TA = 25 °C |
| IR, reverse current | 2.0 at TA = 25 °C and 50 at TA = 100 °C; OCR/unit extraction is ambiguous, likely µA rather than mA |
| Trr, reverse recovery time | 100 ns max at TA = 25 °C |
| CJ, virtual junction capacitance | 15 pF max at TA = 25 °C, VRRM = 0, f = 1 MHz |
| Package style | Axial leads with cathode band |
| Body length A | 0.60 in / 15.24 mm max |
| Lead length B | 0.60 in / 15.24 mm min |
| Lead diameter C | 0.028 to 0.032 in / 0.71 to 0.81 mm |
| Body diameter D | 0.170 in / 4.30 mm max |
Schematic Symbol / Terminal Review
Current schematic terminals:
Table
| Terminal | Current metadata | Datasheet expectation | Assessment |
|---|---|---|---|
| Pin 1 | Pin Number = 1; Pin Type = Unspecified; no Pin Description | Cathode, side marked by cathode band | Incomplete. Should explicitly state Cathode / K and use Passive pin type. |
| Pin 2 | Pin Number = 2; Pin Type = Unspecified; no Pin Description | Anode, opposite cathode band | Incomplete. Should explicitly state Anode / A and use Passive pin type. |
The symbol uses two terminals but does not currently expose diode polarity in terminal metadata. If the graphic itself shows the cathode bar on the left, then pin 1 on the left is consistent with the footprint. If the graphic lacks a visible cathode bar or has it on the opposite side, that is a polarity mismatch.
Footprint Review
Current footprint asset:
DIOAD3244W81L1524D430.kicad_mod.Observed footprint geometry:
Table
| Feature | Current footprint | Datasheet expectation | Assessment |
|---|---|---|---|
| Body outline length | 15.24 mm | 15.24 mm max | Match |
| Body outline diameter/height | 4.30 mm | 4.30 mm max | Match |
| Lead hole drill | 1.0 mm | 0.71 to 0.81 mm lead diameter | Reasonable clearance |
| Pad size | 1.5 mm diameter/width | Not specified in datasheet | Manufacturable but modest annular ring: about 0.25 mm per side with 1.0 mm drill |
| Pad center spacing | 32.4 mm | Datasheet gives lead length, not PCB hole spacing | Plausible compact bent-lead footprint, but not a required straight-lead span |
| Cathode marking | Marking near left/body pad-1 side | Cathode band marks cathode lead | Consistent if pad 1 = cathode |
The footprint appears mechanically aligned to the attached datasheet body dimensions and lead diameter. Pad 1 is rectangular and on the cathode-marked side, which is consistent with common diode footprint convention and the datasheet cathode-band marking.
Mismatches / Risks Flagged
- Missing pin descriptions: Pin 1 and Pin 2 do not explicitly identify Cathode/Anode.
- Pin Type is Unspecified: Both diode pins should be Passive for ERC clarity.
- Polarity depends on artwork convention: The footprint strongly implies pad 1 = cathode, but the schematic terminal metadata does not say this. Recommended mapping: Pin 1 = Cathode/K, Pin 2 = Anode/A.
- High-voltage clearance risk: The part is rated 20 kV, but the footprint courtyard and 32.4 mm pad spacing should not be interpreted as sufficient PCB creepage/clearance for every 20 kV design. Real use may require larger spacing, slots, potting/oil, conformal coating, corona control, and application-specific safety rules.
- Reverse-current unit ambiguity: OCR output around the reverse current table is inconsistent. The numeric values are likely microamps, but the original PDF image should be manually checked before encoding leakage-current properties.
- Alternate public datasheets differ: Public mirrors/alternate sources found during search show larger package outlines and some differing specs. The current footprint matches the attached Datasheet URL, not every public 2CL2FM reference.
Recommended Fixes
- Set terminal/pin metadata:
- Pin 1: Pin Description =
Cathode (K), cathode-band side; Pin Type =Passive. - Pin 2: Pin Description =
Anode (A); Pin Type =Passive.
- Pin 1: Pin Description =
- Confirm the symbol graphic visibly places the cathode bar on the pin-1 side.
- Add a part note or implementation detail warning that 20 kV designs require application-specific creepage/clearance and may require potting/oil or other HV layout practices.
- Manually verify the reverse-current unit from the PDF image before storing leakage-current properties.
Overall Assessment
The footprint body size, lead drill, pad count, and likely pad polarity are consistent with the datasheet currently attached to the part. The main issues are incomplete schematic terminal metadata and the need for explicit high-voltage layout warnings. No Datasheet URL update was performed because the property was already populated.
Scope
Available Part Information
Datasheet-Derived Key Specs
Schematic Symbol / Terminal Review
Footprint Review
Mismatches / Risks Flagged
Recommended Fixes
Overall Assessment
