David Truong, the former Vietnamese antiwar activist accused of spying for Hanoi, was released yesterday under $250,000 bond.

He had been held in the Alexandria City jail since he and his codefendant, U.S. Information Agency employe Ronald L. Humphrey, were arrested Jan. 31 for allegedly funneling classified State Department documents to Vietnamese officials.

The bond was given to the court over the last few days in the form of a trust on Los Angeles real estate owned by Truong's sister and her husband with an equity value of $160,000 and negotiable securities valued at $125,000.

Ten percent of the securities were posted by the National Council of Churches Ecumenical Bail Bond Fund. A press release said the fund is used to aid minority defendants who are being held on "excessive" bail and are "believed to be the victims of racial, political or economic discrimination." The fund does not take a position on the defendant's guilt or innocence.

Another $50,000 worth of the securities were supplied by the America Friends Service Committee, a Quaker organization in Philadelphia that actively opposed the Vietnam war.

The rest of the securities came from "about 10 concerned individuals" according to defense attorney Michael E. Tigar.

Truong's lawyers had told U.S. District Court Judge Albert V. Bryan Jr. on April 4 that they had raised the money, but it was not until yesterday that all the certificates, trusts, title searches and related matters were completed to the satisfaction of the court.

The bond, which was unsuccessfully appealed, was set at a quarter of a million dollars because the government said it had reason to fear Truong would flee the country if released. His father and other relatives are still in Vietnam.

Bryan said yesterday that he did not expect the bond would have to be for feited.

"I'm a bit stunned by the efforts involved to keep me in jail," said Truong as he walked out of the federal court house in Alexandria late yesterday aftrnoon. He said he was sorry his release had been slowed by "such petty things, really."

Humphrey is still in jail, having been unable to raise any substantial portion of his $150,000 bond, according to his attorney.

The trial is scheduled to begin May 1.