Find alternate parts

curl --request GET \
  --url https://api.partfinder.dev/v1/alternates \
  --header 'Authorization: Bearer <token>'

import requests

url = "https://api.partfinder.dev/v1/alternates"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.partfinder.dev/v1/alternates', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.partfinder.dev/v1/alternates",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.partfinder.dev/v1/alternates"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.partfinder.dev/v1/alternates")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.partfinder.dev/v1/alternates")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

response = http.request(request)
puts response.read_body

{
  "as_of": "2026-09-29T07:28:59.267Z",
  "summary": "3 alternates for TPS54331DR: AP63301WU-7 (Diodes Incorporated), AP63300WU-7 (Diodes Incorporated), AP64351SP-13 (Diodes Incorporated). 3 of them are in stock at a distributor. Confirm fit against the datasheets before substituting.",
  "notice": "Informational only. Risk scores, stock levels, lead times and alternate-part suggestions may be incomplete, delayed or inaccurate. Independently verify before making procurement, engineering, compliance, safety or sourcing decisions.",
  "part": {
    "mpn": "TPS54331DR",
    "manufacturer": null
  },
  "alternates": [
    {
      "mpn": "AP63301WU-7",
      "manufacturer": "Diodes Incorporated",
      "description": "Adjustable 3 A step-down regulator, 6-pin package",
      "match": "similar",
      "lifecycle": "Active",
      "supply": {
        "stock": {
          "value": 81702,
          "unit": "units"
        },
        "distributor_count": 3,
        "lead_time_median": {
          "value": 101,
          "unit": "days"
        }
      }
    },
    {
      "mpn": "AP63300WU-7",
      "manufacturer": "Diodes Incorporated",
      "description": "Adjustable 3 A step-down regulator, 6-pin package",
      "match": "similar",
      "lifecycle": "Active",
      "supply": {
        "stock": {
          "value": 54602,
          "unit": "units"
        },
        "distributor_count": 4,
        "lead_time_median": {
          "value": 129,
          "unit": "days"
        }
      }
    },
    {
      "mpn": "AP64351SP-13",
      "manufacturer": "Diodes Incorporated",
      "description": "Adjustable 3.5 A step-down regulator, 8-pin package",
      "match": "similar",
      "lifecycle": "Active",
      "supply": {
        "stock": {
          "value": 78939,
          "unit": "units"
        },
        "distributor_count": 6,
        "lead_time_median": {
          "value": 84,
          "unit": "days"
        }
      }
    }
  ]
}

{
  "error": "authentication_required",
  "summary": "<string>",
  "reason": "<string>",
  "billing_url": "<string>",
  "did_you_mean": [
    "<string>"
  ]
}

{
  "error": "authentication_required",
  "summary": "<string>",
  "reason": "<string>",
  "billing_url": "<string>",
  "did_you_mean": [
    "<string>"
  ]
}

{
  "error": "credits_exhausted",
  "summary": "Your organization's credits for this month are used up, so this request was not run. Upgrade your plan in the PartFinder console at https://console.partfinder.dev/settings/billing, then try again.",
  "reason": "This request needs 1 credit and 0 are left.",
  "billing_url": "https://console.partfinder.dev/settings/billing"
}

{
  "error": "authentication_required",
  "summary": "<string>",
  "reason": "<string>",
  "billing_url": "<string>",
  "did_you_mean": [
    "<string>"
  ]
}

{
  "error": "authentication_required",
  "summary": "<string>",
  "reason": "<string>",
  "billing_url": "<string>",
  "did_you_mean": [
    "<string>"
  ]
}

{
  "error": "authentication_required",
  "summary": "<string>",
  "reason": "<string>",
  "billing_url": "<string>",
  "did_you_mean": [
    "<string>"
  ]
}

{
  "error": "authentication_required",
  "summary": "<string>",
  "reason": "<string>",
  "billing_url": "<string>",
  "did_you_mean": [
    "<string>"
  ]
}

{
  "error": "authentication_required",
  "summary": "<string>",
  "reason": "<string>",
  "billing_url": "<string>",
  "did_you_mean": [
    "<string>"
  ]
}

{
  "error": "authentication_required",
  "summary": "<string>",
  "reason": "<string>",
  "billing_url": "<string>",
  "did_you_mean": [
    "<string>"
  ]
}