Case of Output Abnormality in MBR Schottky Diode

Project Issue: Schottky diode MBR1645 Output exception

XX Manager Li of the Power Supply Department Reflect In PC Power supply Use this Schottky diode in the circuit. MBR1645CT The non-performing loan ratio is very high. ( 高达 4.9% ) , statistics 204 There are defective units in the Taiwan-made complete machines. 10 Taiwan . Main The adverse phenomenon manifests as +5V ( 4.75~5.25V ) Output is low (under load) 8A Voltage output 4.6V the following), resulting in +12V Output is relatively high (close to 13V ) . Having understood the situation, we have arranged for engineering work to… XX The customer provided the service, and after a thorough investigation, it was preliminarily determined that the issue was caused by improper application. More detailed testing of the faulty pipe is required to identify the root cause. Mr. Li has provided us with… 1 Taiwan PC Power supply and 11 only Exception Disassembly pipe 。

Analyze abnormal issues ：

Received the defective Schottky diode sent by this customer. MBR1645 , we can see as shown in the figure 1-1 . This Schottky diode has an appearance of Obvious signs of screw tightening. An engineering team was assigned to conduct parameter testing on the pipeline. XX Customer anomaly Disassembly pipe, Results of parameter testing It is mainly manifested as VF Slightly large . Next, two defective Schottky diodes were dissected for analysis. After disassembling the devices, we found that the chips had detached from their frames, as shown in the figure. 1-2.

Exception Analysis Results:

1. The main manifestations of defective pipes are VF Clearly oversized; this phenomenon will result in issues on the power supply. +5V Output is low;

2. The chips in the defective tube have already delaminated laterally. This condition may be related to excessive stress experienced by the chip. Stress Related, such as system integration by OEMs.

   Fixed components and other stages may all subject the assembly to significant external forces—typically attributed to excessive torque when using a screwdriver or impact driver.

3. MBR1645CT The pipe’s parameters themselves have no warranty issues. Abnormal phenomena occur during operation. Belongs to the application category Incorrect Lead to adverse effects.

Recommended measures:

When the analysis results were obtained, we had already determined that the cause of the customer’s Schottky diode… MBR1645CT The cause of the output anomaly was that the tube was subjected to significant external force, and excessive torque during the screw‑driving process resulted in delamination of the bonding wires connecting the chip to the frame pins, triggering a cascade of downstream issues. We immediately advised the customer… Adjust the electric impact wrench’s torque or replace it with one that can withstand higher stress. The framework.

Customer Satisfaction: ★★★★★

Upon receiving our analysis results and application recommendations, XX After Mr. Li, the customer, adjusted the torque of the electric impact wrench, Schottky diode MBR1645CT There were no further issues with the output. During this collaboration, Manager Li remarked, “Fortunately, we encountered Jiaxun while sourcing online, which helped us resolve the problem; otherwise, we would have incurred another costly labor expense.” Creating value for our customers is the sole raison d’être of Jiaxun, and it is precisely because of this partnership that… XX Only Mr. Li from the power supply company would choose to maintain a long-term partnership with Jiaxun Electronics. In the blink of an eye, half a year has passed, and each time I pay a visit… XX When powering on, XX Manager Li of the Power Supply Department always greets Jiaxun with great enthusiasm and heartfelt warmth, building a bridge of friendship!