Tight supply of LT1963, AWL5963 provides a high-performance and feasible replacement solution.

With the rapid development of Industrial Internet of Things (IIoT), communication gateways, as critical nodes connecting on-site equipment and cloud platforms, impose extremely high requirements on power supply reliability, power purity and long-term supply stability.

A well-known industrial automation enterprise adopted the LT1963 LDO to power its 4G edge gateway’s RF modules and main control processor for a long time. However, continuous global supply shortages of the LT1963 put the project at risk of delivery delays. The engineering team thus evaluated the high-performance domestic LDO AWL5963 as an alternative solution. The replacement not only resolved supply chain constraints, but also delivered unexpected improvements to overall system performance.

Why Choose AWL5963? Compatibility is the primary requirement

For mass-produced products, any hardware modification leads to high costs of re-certification. The team first verified the package compatibility of the AWL5963. According to its datasheet, the AWL5963 is available in the SOP8L package with fully pin-to-pin compatibility with the LT1963 SO-8 package. All pins including input, output, ground, enable and adjust terminals are perfectly matched. This enables true seamless replacement with only part number modification in the BOM, without any PCB layout changes or peripheral circuit adjustments.

Key Performance Comparison: Beyond Replacement, Superior Performance

On the premise of full compatibility, the team conducted an in-depth comparison of core electrical parameters between the two chips.

First, power supply noise. Industrial sites feature complex electromagnetic environments, and RF modules are highly sensitive to power supply ripple. The LT1963 is rated for an output noise of 40 μV RMS (10Hz to 100kHz). Under identical test conditions, the AWL5963 achieves only 15 μV RMS noise. This remarkable advantage originates from its optimised internal voltage reference and error amplifier design. In practical tests, the gateway’s receiving sensitivity was improved by approximately 0.5 dB after replacement, with significantly enhanced communication stability under weak signal conditions.

Second, dropout voltage. Gateways are commonly powered by wide-input DC power supplies or batteries. When the input voltage drops, the LDO dropout voltage directly determines normal system operation. The typical dropout voltage of the LT1963 is 340 mV at 1.5 A load current, while the AWL5963 is only 320 mV. Although the difference is merely 20 mV, in two-stage power supply architectures such as 12V-to-5V and 5V-to-3.3V conversion, it provides wider design margin for the front-end DC-DC converter and improves the system’s adaptability under low input voltage conditions.

In addition, load regulation is another key indicator of LDO stability. The load current surges instantly when the gateway activates its 4G module from standby mode. The AWL5963 features a typical load regulation of 3 mV, outperforming the LT1963’s 5 mV. Under dynamic heavy-load conditions, the AWL5963 maintains more stable output voltage and reduces the risk of processor reset caused by power supply fluctuations.

Reliability & Protection Functions

Industrial equipment is required to operate reliably under harsh environments for long periods. Both ICs integrate comprehensive protection mechanisms, including reverse battery protection, overcurrent protection and thermal shutdown.

As specified in the AWL5963 datasheet, it supports up to -20 V reverse input with reverse current blocking capability, fully coping with wiring errors and power surge scenarios in industrial applications. Its operating junction temperature range is from -40°C to +125°C, identical to the LT1963, ensuring stable operation in extreme high and low temperature environments.

Supply Security: From Passive Waiting to Active Control

Satisfactory performance is only the first step. Long-term stable supply is vital for industrial customers. As an imported device, the LT1963 suffers from uncertain lead times due to global capacity allocation and logistics bottlenecks.

In contrast, the AWL5963 is independently developed by domestic manufacturer AnalogWin with a fully localized supply chain. Through authorised distributors such as Mandu Technology, the enterprise receives samples within one week and mass production orders within four weeks. It has completely escaped the passive situation of production delays caused by component shortages.

Conclusion: A Strategic Upgrade

This replacement is not merely an emergency material solution, but a successful strategic upgrade.

Thanks to pin-to-pin compatibility with the LT1963, lower noise, improved dropout voltage and superior load regulation, the AWL5963 perfectly inherits the original circuit design while delivering measurable system performance gains. More importantly, it builds a secure, reliable and responsive localised supply chain for the enterprise.

For industrial communication device manufacturers facing LT1963 supply shortages, the AWL5963 is undoubtedly an ideal high-performance alternative worthy of priority evaluation.