LNK363PN
Power Integrations · LinkSwitch®-XT Series
IC OFFLINE SWITCH FLYBACK 8DIP
MOQ 1 · Tube · RoHS · EIA-481 · DAP/DDP · T/T
Technical specifications
| Parameter / Attribute | Specification / Value |
|---|---|
| Series | LinkSwitch®-XT |
| Mounting | Through Hole |
| Voltage - breakdown | 700V |
| Power (Watts) | 7.5 W |
| Frequency - switching | 132kHz |
| Duty cycle | 60% |
| Operating temperature | -40°C~150°C(TJ) |
| Package | Tube |
| Topology | Flyback |
| Case | 8-DIP (0.300\", 7.62mm), 7 Leads |
| Fault protection | Current Limiting, Open Loop, Over Temperature, Short Circuit |
| Output isolation | Isolated |
| Internal switch | Yes |
Need Stock or a Drop-in Second-Source for LNK363PN?
Package: DIP-8 / SMD-8 (PN / GN) · Pin-compatible replacements with immediate Shenzhen spot stock
The LinkSwitch-XT row (LNK362/363/364) is the sub-10-watt offline switcher of standby supplies, small adapters and the auxiliary rails inside bigger equipment: a 700V integrated MOSFET with self-powered ON/OFF control, 132kHz with jitter, and power tables running from about 2.8W to 9W - all in the DIP-8/SMD-8 body the whole industry recognizes. The substitution story is honest and local: the three family members interchange as a MATCHED SET with a design check (the drain current limit moves from the 200mA class to the 400mA class between rungs, and Power Integrations own guidance is to re-run the magnetics), while the two name neighbors - the LinkSwitch-TN parts (LNK30x) and the TinySwitch line - are different circuits that share only the brand.
Verified Pin-Compatible Replacements (2 verified alternatives)
The Middle Rung With the Same Limits
Shenzhen Spot Stock (24-48h Dispatch)
The middle member: the same 400mA-peak (750mA at low drain voltage) current limit class as the 364 with lower power tables (about 5W/7.5W against 5.5W/9W open frame) - which in practice means a design fitted with the 363 runs the 364 fine, and the reverse needs the load re-checked.
Same 700V internal MOSFET and self-powered scheme.
The 2.8W Rung and Its Current Limit
Shenzhen Spot Stock (24-48h Dispatch)
The bottom rung: same family, 700V class, but the drain current limit halves to the 200mA peak class (375mA at low voltage) - the number that actually moves the magnetics and the loss profile when crossing rungs.
Same offline envelope, lower deliverable power (about 2.8W universal input).
Buyer & Quality Checklist for Sourcing Alternatives
- The family substitution rule is documented and sober: within LNK362/363/364 the parts interchange, but crossing the 200mA-class (362) and 400mA-class (363/364) current limits changes duty behavior and transformer stress - Power Integrations recommends re-running the reference design tool rather than a blind swap.
- The drain current limit is the design parameter, not the package: 200mA peak / 375mA low-voltage for the 362 against 400mA / 750mA for the 363/364 - the same 8-pin body hides a different converter after the swap.
- The TN branch is a different machine: the LinkSwitch-TN parts (LNK302/304/305/306) are the non-isolated buck/buck-boost controllers for the under-360mA output class - a different topology decision entirely, matched by the LNK prefix and nothing else.
- TinySwitch (TNY) shares the brand, the offline duty and the general philosophy - and neither the pinout nor the control dimension: per the verified substitution lists, LNK362/363 are the family answers for a 364, TNY is not.
- The 700V self-powered design lives on its drain network and feedback: a "dead" LNK supply is often a startup/drain component or an open feedback path - check those before the IC, and remember a replacement IC in a faulted network dies on schedule too.
- 132kHz with jitter is an EMI feature tied to the reference magnetics: home-winding a transformer changes the emissions story, so a repaired supply should be re-checked (or built to the PI reference design) before claiming the original compliance.
Frequently Asked Technical Questions
Q: Can an LNK363 replace an LNK364?
A: The current limits match (the 400mA class) while the power table sits lower - usually workable with the load checked against the table. The LNK362 is the 200mA rung and is not a like-for-like move; Power Integrations recommends re-verifying the magnetics for any rung change.
Q: Is an LNK364 compatible with TNY parts?
A: No - same brand, different families: different control scheme, pinout and power architecture. The verified substitution list for a 364 stays inside LinkSwitch-XT (LNK362/363); TinySwitch is not on it.
Q: Why does my LNK supply fail again after replacing the IC?
A: Because the fault was rarely in the IC: the drain/startup network, an open feedback path or the transformer were the real suspects. A fresh LNK in a faulted network dies on schedule - check the passive ring around it before the second replacement.