LNK306PN Part Review
Thought for 9 sec
I’ll update the LNK306PN terminal pin numbers and add datasheet-based pin descriptions, then verify the symbol metadata afterward.
Worked for 1 min 7 sec
Pin numbers and descriptions are updated; I’m verifying the terminal metadata now.
Thought for 21 sec
Updated and verified the LNK306PN symbol terminal metadata against the datasheet.
Open items:
- Pin numbering and pin descriptions are now corrected.
- Pin types are still
Unspecified. - Footprint still has the known pin-6 pad/hole issue unless you want me to correct it next.
Suggested next steps:
- Set datasheet-appropriate pin types for BP, FB, D, SOURCE, and NO_PIN.
- Remove the pin-6 pad/hole from the footprint.
- Run a final symbol/footprint validation pass.
Fix types and footprint
Set pin types
Fix pin-6 pad
Run final validation
Update review report
Refine this doc
Ask about this doc
LNK306PN Part Review
Date: 2026-07-20
Reviewed part metadata
- Project / part:
LNK306PN - Flux part UID:
517d3c77-5c93-4342-bab7-ab92c72ae4e3 - Manufacturer Part Number:
LNK306PN - Manufacturer Name:
Power Integrations - Project description:
Power Integrations, LNK306PN Step-Down Switching Regulator, 1-Channel 360mA 7-Pin, DIPB - Designator Prefix:
IC - Datasheet URL property:
https://www.mouser.com/datasheet/2/328/lnk302_304-306-1512550.pdf - Machine Datasheet URL: not set
- Library terminal count:
8 - Layout footprint asset:
DIP762W56P254L958H406Q8N.kicad_mod - 3D model asset:
LNK306PN.stp
The Datasheet URL property was already set, so no Datasheet URL update was required by the request.
Datasheet source and identity
The set datasheet is for the Power Integrations LinkSwitch-TN family,
LNK302/304-306, Rev. J, June 2013. It identifies LNK306PN as an off-line switcher IC with an integrated 700 V MOSFET in the P package.Key datasheet specifications
- Family: LinkSwitch-TN
- Function: lowest-component-count off-line switcher IC; commonly used as non-isolated buck converter / linear or capacitive dropper replacement
- Supported topologies: buck, buck-boost, flyback
- Integrated MOSFET: 700 V
- Universal input application range: 85 VAC to 265 VAC
- Output current, typical non-isolated buck:
- 225 mA in MDCM
- 360 mA in CCM
- Control: ON/OFF control
- Switching frequency: 66 kHz typical average; 62 kHz min / 70 kHz max at TJ = 25 °C
- Frequency jitter: 4 kHz peak-to-peak typical
- Maximum duty cycle: 69% typical
- FEEDBACK turnoff threshold current: 49 µA typical
- FEEDBACK voltage at threshold: 1.65 V typical
- BYPASS pin voltage: 5.8 V typical
- Required BYPASS capacitor: 0.1 µF from BP to SOURCE
- Thermal shutdown: 142 °C typical
- Operating junction temperature: -40 °C to 150 °C
- P-package thermal resistance: about 70 °C/W with 0.36 sq. in. 2 oz copper, 60 °C/W with 1 sq. in. 2 oz copper
Correct LNK306PN P-package pinout
The correct Power Integrations
P package / PDIP-8B pinout is:Table
| Pin | Datasheet name | Datasheet function |
|---|---|---|
| 1 | BP / BYPASS | External 0.1 µF bypass capacitor connection for the internally generated 5.8 V supply. |
| 2 | S / SOURCE | Power MOSFET source; reference for BYPASS and FEEDBACK pins. |
| 3 | S / SOURCE | Power MOSFET source; reference for BYPASS and FEEDBACK pins. |
| 4 | FB / FEEDBACK | Controls MOSFET switching; switching terminates when current into FB exceeds threshold. |
| 5 | D / DRAIN | Power MOSFET drain; supplies internal start-up and operating current. |
| 6 | Omitted / no lead | No physical lead in P package. |
| 7 | S / SOURCE | Power MOSFET source; reference for BYPASS and FEEDBACK pins. |
| 8 | S / SOURCE | Power MOSFET source; reference for BYPASS and FEEDBACK pins. |
Current symbol / terminal state observed in Flux
Table
| Flux terminal | Current Pin Number property | Current pin type | Datasheet expectation | Result |
|---|---|---|---|---|
S_1 | 1 | Unspecified | Pin 1 = BP | Mismatch |
S_2 | 2 | Unspecified | Pin 2 = S | Name/function OK, type incomplete |
BP | 3 | Unspecified | Pin 3 = S | Mismatch |
FB | 4 | Unspecified | Pin 4 = FB | Function OK, type incomplete |
D | 5 | Unspecified | Pin 5 = D | Function OK, type incomplete |
NO_PIN | 6 | Unspecified | Pin 6 omitted, no lead | Mismatch |
S_3 | 7 | Unspecified | Pin 7 = S | Function OK, type incomplete |
S_4 | 8 | Unspecified | Pin 8 = S | Function OK, type incomplete |
Footprint review
The layout uses a DIP762W56P254 footprint with 2.54 mm pitch and 7.62 mm row spacing, which matches the PDIP-8B geometry family. However, the footprint asset includes plated through-hole pads for pins 1 through 8, including pad 6.
Datasheet package facts:
- Package:
P, Plastic DIP,PDIP-8B/P08B - Physical leads present: 1, 2, 3, 4, 5, 7, 8
- Pin 6 is omitted / no lead
- 0.300 in / 7.62 mm row spacing
- 0.100 in / 2.54 mm lead pitch
- Pin 6 omission provides high-voltage spacing between Drain and adjacent low-voltage/source-side pins
Mismatches and risks
- Pin 1 is wrong in the symbol: Flux labels pin 1 as
S_1, but the datasheet says pin 1 isBP. - Pin 3 is wrong in the symbol: Flux labels pin 3 as
BP, but the datasheet says pin 3 isS. - Pin 6 should not exist as a connected terminal or copper pad: Flux has
NO_PINwith pin number 6 and the footprint includes pad 6. The datasheet says pin 6 is physically omitted. - Footprint is effectively an 8-pad DIP footprint, not a 7-lead PDIP-8B footprint: The pin 6 pad/hole should be removed to preserve the intended omitted-lead spacing.
- Pin descriptions are missing: current terminals do not have datasheet-derived Pin Description properties.
- Pin types are incomplete: every terminal currently has
Pin Type: Unspecified; the symbol should classify BP, FB, D, and S pins appropriately. - Library terminal count says 8, but the part has 7 physical leads: the omitted pin can be represented only as a non-electrical mechanical/no-pin marker if needed, but it should not create a PCB pad or routable terminal.
- Manufacturer field inconsistency in library search: project properties say
Power Integrations, but library search facet showed manufacturer asOther. The explicit Manufacturer Name property is correct.
Recommended corrections
- Change
BPterminal Pin Number from 3 to 1. - Change
S_1terminal Pin Number from 1 to 3, or rename/reassign pins so SOURCE terminals are pins 2, 3, 7, and 8. - Remove the
NO_PINelectrical terminal or mark it non-electrical and excluded from PCB if Flux requires a visual placeholder. - Replace or edit the footprint so there is no plated through-hole pad/hole/copper for pin 6.
- Add datasheet-derived pin descriptions for all real pins.
- Set electrical pin types, for example:
- BP: Power / supply bypass or passive/control supply node
- S pins: Power / source return reference
- FB: Input
- D: Power / high-voltage drain
- Consider updating Part Type / Integrated Circuit Type to Power Management or Off-line Switcher so the library metadata is more searchable.
Bottom line
The metadata and package family are broadly correct, and the Datasheet URL is present. The symbol and footprint are not safe to use as-is because BP and a SOURCE pin are swapped, and the footprint includes a pin-6 plated hole where the real LNK306PN has no lead.
Reviewed part metadata
Datasheet source and identity
Key datasheet specifications
Correct LNK306PN P-package pinout
Current symbol / terminal state observed in Flux
Footprint review
Mismatches and risks
Recommended corrections
Bottom line
