Size creepage/clearance per IPC-2221 without digging through PDFs.
Enter a working voltage, pick the environment that matches your copper or component scenario, and instantly pull the minimum clearance pulled straight from IPC-2221B Table 6-1.
31 – 50 V
Voltage band
B2
Environment
MM
Units
Environment quick guide
B1
Embedded copper, internal layers.
B2
Uncoated, up to 3050 m altitude.
B3
Uncoated, operations above 3050 m.
B4
Permanent polymer coating on copper.
A5
Assemblies with conformal coating.
A6
Component leads / terminations, uncoated.
A7
Component leads with conformal coating.
Reference: IPC-2221B Section 6.3.3.
Standard
IEC 60664 data coming soon—IPC 2221 coverage ships first.
Enter the maximum steady-state voltage difference between conductors.
Shown values convert live using 25.4 mm/inch.
Environment
Minimum clearance
0.600 mm
IPC-2221B Section 6.3.3, Table 6-1 • 31 – 50 V • B2
millimeters
Converted live from 0.600 mm
| Environment | Clearance (mm) |
|---|---|
B1 — Internal conductors Embedded copper, internal layers. | 0.100 |
B2 — External conductors Uncoated, up to 3050 m altitude. | 0.600 |
B3 — External conductors (high altitude) Uncoated, operations above 3050 m. | 0.600 |
B4 — Polymer-coated conductors Permanent polymer coating on copper. | 0.130 |
A5 — Conformal coated Assemblies with conformal coating. | 0.130 |
A6 — Component leads Component leads / terminations, uncoated. | 0.400 |
A7 — Coated component leads Component leads with conformal coating. | 0.130 |
Note: Values are the minimum clearances called out in IPC-2221B. Always round up per your fabricator’s manufacturability guidelines and altitude derating.
- Validate whether creepage or clearance is the limiting factor on your design.
- Coordinate with your fabricator for coating thickness or altitude exceptions.
- Pair this calculator with the stackup playbook to double-check dielectric spacing.
- Capture the result in fabrication notes alongside the net names involved.
0 – 15 V
Min 0 V • Max 15 V
16 – 30 V
Min 16 V • Max 30 V
31 – 50 V
Min 31 V • Max 50 V
51 – 100 V
Min 51 V • Max 100 V
101 – 150 V
Min 101 V • Max 150 V
151 – 170 V
Min 151 V • Max 170 V
171 – 250 V
Min 171 V • Max 250 V
251 – 300 V
Min 251 V • Max 300 V
301 – 500 V
Min 301 V • Max 500 V
> 500 V
Min 501 V