Junction temperature
API · /heatsink-api
Heatsink Thermal API
healthy
3,641 Subscribers
Heatsink and thermal-resistance maths for electronics as an API, computed locally and deterministically. The junction endpoint computes the junction temperature of a component from its power dissipation, the ambient temperature and the thermal-resistance chain, Tj = Ta + P·(Rθjc + Rθcs + Rθsa) — junction-to-case, case-to-sink (the interface material) and sink-to-ambient — and also reports the case and sink temperatures and, given a maximum junction temperature, the headroom. The required endpoint solves the largest heatsink thermal resistance you may use to stay under a junction limit, Rθsa = (Tj_max − Ta)/P − Rθjc − Rθcs, and flags when no heatsink can do it. The power endpoint gives the maximum power a device can dissipate for a given thermal path, P = (Tj_max − Ta)/Rθtotal. Everything is computed locally and deterministically, so it is instant and private. Ideal for electronics, power-supply and PCB-design app developers, heatsink selection and thermal-budget tools, and engineering education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is conduction thermal-resistance; for convective Newton cooling use a cooling API.
api.oanor.com/heatsink-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 75 ms
- Server probes · 24h
- Subscribers
- 3,641
- active
- Total calls
- 76
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 2,000 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- Junction temperature endpoint
- Thermal-resistance series solver
- Deterministic local compute, no upstream latency
Starter
€9.00 /month
- 15,000 calls / month
- 5 requests / second
- Hard cap (429 above quota, no overage)
- All thermal-resistance endpoints
- Junction temp & max-power-dissipation calc
- Aluminum & copper material presets
- Email support
Pro
€24.00 /month
- 120,000 calls / month
- 15 requests / second
- Hard cap (429 above quota, no overage)
- High-volume batch thermal solves
- Forced & natural convection models
- Heat-sink sizing from power budget
- Priority support
Mega
€74.00 /month
- 750,000 calls / month
- 40 requests / second
- Hard cap (429 above quota, no overage)
- Unmetered design-pipeline throughput
- Full junction-to-ambient stack-up modeling
- Bulk thermal sweeps for CI/CAD integration
- SLA-backed support
Built by
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api.oanor.com/rcfilter-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Heatsink Thermal API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Heatsink Thermal API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Heatsink Thermal API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Heatsink Thermal API cost?
Heatsink Thermal API has a free tier with 100 calls / month. Paid plans start at €9.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Heatsink Thermal API GDPR-compliant?
All requests to Heatsink Thermal API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/heatsink-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/heatsink-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/heatsink-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/heatsink-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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