What is the difference between static and dynamic burn-in?

Static burn-in applies DC bias (gate and drain voltages) at elevated temperature but does not exercise the device with RF signals. It detects thermally-activated failure mechanisms like gate metal diffusion, ohmic contact degradation, and passivation defects. Dynamic burn-in additionally applies modulated RF drive signals during the stress period, exercising the device through its full operating swing and detecting mechanisms related to hot carrier injection, trap charging under large signal, and thermal cycling from RF self-heating. Dynamic burn-in provides higher fault coverage (90 to 95 percent vs 70 to 80 percent for static) but requires more complex and expensive test infrastructure.

What is a burn-in board (BIB)?

A burn-in board is a specialized PCB designed to hold multiple devices under test (typically 16 to 64 per board) inside the burn-in oven. BIBs must withstand the elevated temperatures (up to 300 degrees Celsius) using high-Tg laminates (polyimide or ceramic). Each device socket provides individual bias connections, and the board routes power and monitoring signals to edge connectors that interface with the oven's driver and measurement electronics. For RF burn-in, the BIB may include RF signal distribution networks with controlled impedance traces and attenuators to deliver calibrated RF drive to each device.

What are the key oven specifications?

Burn-in ovens must maintain uniform temperature across all board slots with accuracy of plus or minus 3 degrees Celsius. Typical specifications include temperature range of 25 to 300 degrees Celsius, capacity of 4 to 32 burn-in boards, forced air convection for thermal uniformity, individual board bias supply monitoring and fault protection, data logging for all bias currents and temperatures at intervals of 1 to 60 minutes, and safety interlocks for over-temperature and over-current conditions. Military-grade ovens per MIL-STD-883 TM 1015 also require calibrated airflow patterns and NIST-traceable temperature measurement.

Reliability & Qualification

Burn-In Testing

/burn-in test-ing/

The test infrastructure and methodology for performing burn-in screening of RF devices. Encompasses burn-in boards (BIBs), environmental chambers (25 to 300°C), bias supply systems, and in-situ monitoring. Static burn-in applies DC bias only (70 to 80% fault coverage); dynamic burn-in adds RF drive for full operating swing verification (90 to 95% coverage) per MIL-STD-883 TM 1015.

Category: Reliability

BIB Capacity: 16 to 64 DUTs

Temp Accuracy: ±3°C

Understanding Burn-In Testing Infrastructure

Burn-in testing requires specialized equipment that can simultaneously stress dozens of RF devices at elevated temperature while monitoring each device's parametric health. The burn-in board (BIB) holds 16 to 64 devices in high-temperature sockets, routing individual bias and monitoring lines through edge connectors to the oven's electronics. BIBs use polyimide or ceramic substrates rated for 300°C continuous operation.

Static burn-in applies only DC bias (Vgs, Vds) and detects thermally-activated failures. Dynamic burn-in adds calibrated RF drive signals, exercising each device through large-signal operation and catching trap-related and hot-carrier mechanisms that static screening misses. The trade-off is cost: dynamic BIBs with RF distribution networks and impedance-controlled traces cost 3 to 5 times more than static boards.

Oven Requirements

Temperature Control:
Range: 25 to 300°C | Accuracy: ±3°C | Uniformity: ±5°C across slots

Capacity:
4 to 32 BIBs per oven × 64 DUTs/BIB = up to 2,048 DUTs

Monitoring:
Per-device Ids, Igs logging at 1 to 60 min intervals
Over-current protection per channel: trip within 1 ms

Burn-In Approach Comparison

Approach	Stimulus	Fault Coverage	BIB Cost	Mechanisms Detected
Static	DC bias only	70 to 80%	Low	Gate diffusion, ohmic degradation
Dynamic (RF)	DC + RF drive	90 to 95%	High (3 to 5×)	Hot carrier, trap charging, thermal cycling
Module-Level	Full system exercise	95 to 98%	Very high	Assembly, interconnect, system-level

Common Questions

Frequently Asked Questions

Static vs dynamic burn-in?

Static: DC bias at temperature, 70 to 80% coverage, detects thermal mechanisms. Dynamic: adds RF drive, 90 to 95% coverage, catches trap/hot-carrier faults. Dynamic BIBs cost 3 to 5× more but find more defects.

What is a burn-in board?

PCB holding 16 to 64 DUTs in high-temp sockets. Polyimide/ceramic substrate for 300°C. Routes individual bias and monitoring to oven electronics. RF BIBs add impedance-controlled distribution networks.

Key oven specifications?

25 to 300°C, ±3°C accuracy, forced-air convection, 4 to 32 board slots, per-device current monitoring, over-current protection, NIST-traceable calibration per MIL-STD-883 TM 1015.

Related Terms

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