Semiconductor Reliability Test Standards: A Practical JEDEC Guide

How JESD47 and JESD22 Fit Together

JESD47 provides a stress-test-driven qualification framework for integrated circuits. The JESD22 series contains individual test methods. The qualification plan identifies which methods apply to the device and package, along with the required revisions and acceptance criteria; it does not automatically require every JESD22 test.

Six JEDEC Test Methods at a Glance

Common test names are used for navigation. The categories identify setups to evaluate, not verified capabilities of a particular product.

Differences That Affect Chamber and System Selection

THB and HAST Use Different Moisture Environments

Temperature Humidity Bias (THB) uses a temperature-humidity environment at atmospheric pressure. HAST uses a pressurized, high-temperature humidity environment and requires a purpose-built chamber. Raising the setpoint of a conventional temperature-humidity chamber does not reproduce HAST conditions.

The device package and qualification requirements determine the moisture evaluation to use. SANWOOD's HAST chambers and temperature-humidity test chambers are separate product categories for these different test environments. For a project inquiry, identify the selected method first, then specify the bias connections and electrical functions required alongside the chamber.

Bias and Electrical Measurement Need Their Own Scope

Electrical bias, device operation and electrical measurement are separate requirements. For THB or biased HAST, establish how the samples will connect to the bias supply and which electrical functions the laboratory will provide. Unbiased HAST applies no bias during exposure, but electrical evaluation before or after exposure may still be required.

Chamber records document the environment. Results for the device under test (DUT) need their own measurement source and acceptance criteria.

Temperature Cycling Depends on the Sample Response

Temperature cycling repeatedly exposes samples to high and low temperatures. The intended sample load and arrangement affect how the devices respond during dwell periods and transitions. A programmed chamber-air profile alone does not establish that the samples have reached the required temperatures.

Evaluate the required thermal sequence at the samples, including dwell and transition requirements. JESD22-A104 temperature cycling should not be confused with power cycling.

HTOL and HTSL Require Different Test Arrangements

High Temperature Operating Life (HTOL) evaluates devices under operating conditions at elevated temperature. High Temperature Storage Life (HTSL) evaluates high-temperature storage without operating the devices during exposure.

A storage chamber supplies the thermal environment for HTSL. HTOL also needs the electrical functions that operate the devices during stress, so those functions belong in the system scope. A chamber’s temperature range alone does not establish complete HTOL capability. JESD22-A108 is cited here for HTOL; its full scope extends beyond this summary.

Questions About JEDEC Reliability Testing

Does Every Semiconductor Device Need All Six Tests

Not necessarily. The qualification plan determines the methods required for the device and package. A supplier's list of referenced standards is not a qualification checklist.

Can THB and HAST Be Used Interchangeably

Only where the applicable qualification requirements permit the choice or substitution for the device and package. Their shared moisture-related purpose does not establish a universal replacement rule or equivalent test duration.

Which Standard Revision Applies to an Existing Plan

Use the revision specified by the approved qualification plan, together with applicable customer requirements. The responsible qualification team should resolve any conflict or proposed revision change before testing.

Discuss Your Test Requirements With SANWOOD

Send SANWOOD an RFQ with your device and package type, test standard and revision, sample quantity, and bias or operating requirements. Include the relevant requirements from your qualification plan so we can discuss the chamber configuration and clarify which supporting electrical functions are needed and who will provide them.

Standards Referenced

JESD47 — Stress-test-driven qualification of integrated circuits.

JESD22-A101 — Steady-state temperature humidity bias life test.

JESD22-A110 — Highly accelerated temperature and humidity stress test with bias.

JESD22-A118 — Unbiased highly accelerated temperature and humidity stress test.

JESD22-A104 — Temperature cycling.

JESD22-A108 — Temperature, bias and operating life.

JESD22-A103 — High-temperature storage life.

Descriptions identify the subject of each standard; consult the editions required by the approved qualification plan for procedures and acceptance requirements.