Electronic reliability is the discipline of predicting and proving how long hardware survives: accelerated life testing that compresses years into chambers, solder-joint reliability measured in thermal cycles, electromigration and electrical overstress physics, component reliability from derating rules, and the failure analysis that closes every loop. Reliability engineering sits between design and field, in semiconductor vendors, EMS providers, aerospace primes, automotive tiers and industrial OEMs.
The work is governed by matrices. JEDEC's JESD47M describes a baseline set of acceptance tests for qualifying new products, product families and process changes . IPC-9701A establishes thermal cycling test methods for surface mount solder attachments, including the Weibull statistics, mean fatigue life and failure-free life that turn chamber data into field predictions . The people who can run those documents, and argue with their margins, are the constraint behind every warranty decision.
Challenges in Electronic Reliability Recruiting
Accelerated life testing trades calendar time for a model most programs borrow without owning
Accelerated life testing works only as well as the model behind it. JESD47M provides the baseline stress matrix for qualifying new products, but the standard explicitly leaves the thinking to the engineer: which stress, which duration, which acceleration law connects the cell to the field . Arrhenius for thermally activated mechanisms, Coffin-Manson and Norris-Landzberg for solder fatigue, voltage and humidity exponents for electrochemical failure. Most programs borrow those models from papers and apply them without owning the assumptions, and most engineers inherit the same habit, because the models were last checked by people who have since retired. The scarce profile is the person who has built an acceleration factor from their own data, defended it in a design review, and seen it proven wrong once. That person calibrates a program; everyone else administers one.
Electromigration leaves the die and lands on board traces and solder bumps
Electromigration is usually discussed as a silicon problem, which lets board programs ignore it. It is not exclusive to the die. High-current traces, plated vias, solder bumps and wire bonds all move metal under current density and temperature, and the failure arrives as a resistance drift or an open that no schematic predicts. A board-level reliability engineer who has chased an intermittent failure to a voided via or a displaced bump knows the physics; a component engineer knows the die version; a generalist knows the word. The gap matters in power delivery, where current per pin keeps rising, and in any product where a marginal via was accepted at design review and died in year two.
Solder-joint reliability is a Weibull statistics discipline most boards never measure
Solder-joint reliability is the most standardized failure mechanism in electronics and the least practiced. IPC-9701A defines the thermal cycling method, the test parameters, and the statistics: Weibull distributions, mean fatigue life, failure-free life and acceptable cumulative failure probability . IPC-9701B extends the method to characterize fatigue lifetimes of surface mount attachments on rigid, flexible and rigid-flex boards . The craft shows up in the analysis, not the chamber. An Agilent study cycled BGA test vehicles for 8,250 cycles from -5 to 95 °C and read the results off Weibull plots as characteristic life, the cycles to 63.2 percent cumulative failure . Engineers who can produce those plots for their own boards are rare; engineers who can argue what the beta slope says about early-life versus wear-out failures are rarer still.
Electrical overstress hides in the bench and in every field return it fails to explain
Electrical overstress is the most common cause of field returns and the hardest to own on a CV. The damage signatures are concrete: Infineon's qualification report for a power MOSFET lists electrostatic discharge testing to JESD22-A114 human body model classes of 4,000 to 8,000 V, and charged device model testing to JESD22-C101, alongside 1,000-hour bias stresses and 1,000 temperature cycles from -55 to 150 °C, all at zero failures across three lots . The gap is between that document and the field. An EOS engineer reconstructs the event: the energy path, the damage site, the operating condition that invited it. The skill is part semiconductor physics and part detective work, and it shows in the questions asked at the bench: which pin, which polarity, which rise time, and what else was in the loop when it happened. Most boards fail first in the lab, at the technician's hands, and the person who can tell a handling event from a design weakness is the difference between fixing the product and fixing the procedure.
Component reliability begins at the derating table the design team never wrote down
Component reliability is decided before the parts are chosen. Derating, the practice of running components below rated stress, is a document most design teams do not maintain: capacitor voltage derating against bias and temperature, resistor power derating across ambient, transistor safe operating area margins, electrolytic life against ripple and heat. The reliability engineer owns that table and the arguments it settles, and updates it when a supplier changes a process or a datasheet curve shifts. Without it, every design review re-litigates the same margins, and the BOM ships with components whose rated limits are closer than the operating environment can afford. The title hides the skill: a candidate who selected parts against a formal derating policy is a different hire from one who substituted parts from a distributor list.
PCB reliability splits pad cratering, conductive anodic filament and dielectric wear into separate physics
PCB reliability is several failure sciences wearing one name. Pad cratering tears laminate under mechanical strain; conductive anodic filament grows along glass fibers between biased conductors in humidity; via fatigue and dielectric wear accumulate with thermal cycling and voltage. Each has its own test method, its own acceleration model and its own specialists, and the evidence they produce does not interoperate: a CAF coupon result says nothing about crater resistance. A candidate who has run thermal reliability on solder joints has not run high-temperature bias on laminate, and the CV rarely says which one. Design teams discover the difference when a moisture failure appears in a board that passed every thermal cycle test they could think to run.
Weibull plots and TCT profiles expose inflated accelerated life testing claims
Reliability vocabulary is cheap because the documents are public. The probes are statistical. Which stress cells did the candidate own, which profile did the chamber actually run, how many samples, what was the failure criterion, and what did the Weibull plot say: shape, characteristic life, confidence bounds. Ask why the failures were or were not wear-out, and what the acceleration factor assumed. The bar is visible in industry practice: zero failures across three lots of 77 units under 1,000-hour bias and 1,000 thermal cycles . A candidate who can rebuild that analysis for their own program is an owner; one who can only describe the test plan is a witness. The cost of a miss is a qualification program that runs for a year and proves nothing, a warranty reserve built on a borrowed model, and field failures arriving on a schedule the model said was impossible.
References
- JESD47M: Stress-Test-Driven Qualification of Integrated Circuits — JEDEC. (accessed 2026-09-28)
- IPC-9701A: Performance Test Methods and Qualification Requirements for Surface Mount Solder Attachments — IPC. (accessed 2026-09-28)
- IPC-9701B-2022: Thermal Cycling Test Method for Fatigue Life Characterization of Surface Mount Attachments — IPC. (accessed 2026-09-28)
- Thermal Cycle Reliability Study of Vapor Phase BGA Solder Joints — IPC (Agilent Technologies). (accessed 2026-09-28)
- Product Qualification Report IPT017N10NF2S (JEDEC / JESD22 Stress Matrix) — Infineon Technologies. (accessed 2026-09-28)