You’re right, but see above. All you need is a majority — a big enough majority. The vote against Trump impeachment was 7, 3 Dems and 4 did not vote or voted present.
If we had just 7 refusals, we don’t even get out of the House to the Senate.
IOW, the majority is not big enough to do this.
First, the House investigates through an impeachment inquiry.
Second, the House of Representatives must pass, by a simple majority of those present and voting
Third, the Senate tries the accused. In the case of the impeachment of a president, the chief justice of the United States presides over the proceedings. For the impeachment of any other official, the Constitution is silent on who shall preside, suggesting that this role falls to the Senate's usual presiding officer, the president of the Senate, who is also the vice president of the United States. Conviction in the Senate requires the concurrence of a two-thirds supermajority of those present. The result of conviction is removal from office and (optionally, in a separate vote) disqualification from holding any federal office in the future, which requires a concurrence of only a majority of senators present.
I don't care about the trial in the Senate. They'd never get the 2/3 needed anyway. Once the House votes for impeachment he's been 'indicted' to stand trial. There's the asterisk.