Which manufacturers offer customized diodes suitable for communication equipment?

一, Core technical requirements for customized diodes in communication equipment
The customized demand for diodes in communication equipment is mainly reflected in three major scenarios:
High frequency scenario: The 5G millimeter wave frequency band (24GHz-100GHz) requires a diode reverse recovery time (trr) of ≤ 7ns and a junction capacitance (Cj) of ≤ 0.1pF to reduce signal loss. For example, after Huawei's 5G AAU equipment adopts GaN based high-frequency diodes, the loss in the 28GHz frequency band is reduced from 1.2dB to 0.3dB.
High temperature resistant scenario: The power density of the data center server power module exceeds 50kW/cabinet. Traditional silicon-based diodes experience severe performance degradation in environments above 125 ℃, while SiC diodes can operate stably at high temperatures of 200 ℃, with a lifespan extension of 5 times for every 100 ℃ increase in junction temperature.
High integration scenario: ZTE's 5G base station adopts intelligent power module (IPM), which integrates diodes with MOSFETs and IGBTs, reducing the volume by 60%, lowering the failure rate by 80%, and increasing the power density to 500W/in ³.
二, Global customized diode core manufacturer technology layout
1. International manufacturers: leading technology but limited supply chain
Onsemi: By acquiring Fairchild Semiconductor to strengthen its layout in the communication field, its SiC Schottky diodes have been applied in the SpaceX Starlink satellite power system, with a radiation resistance of up to 100krad (Si) and a working life of over 15 years. In the first quarter of 2025, the proportion of revenue in the communication field of Ansome will increase to 28%, mainly due to the growth of 5G base stations and satellite Internet orders.
ROHM: occupies the technological high ground in the field of GaN high-frequency diodes, with a reverse recovery time of only 3ns, suitable for the 5G millimeter wave module of Apple iPhone 15. ROHM controls the entire wafer manufacturing, packaging, and testing chain through vertical integration (IDM mode), reducing the customized response cycle to 4 weeks.
Infineon: The market share of automotive grade SiC diodes reaches 70%, with a product price of 18-22 yuan per unit. However, through cooperation with Huawei and Ericsson to develop 5G base station specific diodes, it gradually penetrates the communication market. Its third-generation SiC diode reduces conduction loss by 30% and has passed AEC-Q101 certification.
2. Domestic manufacturers: cost-effectiveness advantages and localized services
Yangjie Technology: As one of the few domestic manufacturers to implement IDM mode, its 6-inch SiC wafer production capacity has exceeded 50000 pieces per year, with costs 30% lower than international giants. In the first quarter of 2025, Yangjie Technology's revenue in the communication field increased by 51.22% year-on-year, mainly due to:
5G high-frequency diode: trr ≤ 5ns, suitable for ZTE 5G base stations;
Vehicle grade SiC diode: certified by IATF 16949 and used in BYD's in car communication module.
Suzhou Gude: has over 1500 types of diode products, covering fields such as communication, automotive, aerospace, etc. Its customized services include:
Optical communication dedicated diode: providing PIN photodiodes for Huawei and ZTE's 400G/800G optical modules, with a response speed of 0.5ns;
Satellite communication radiation resistant diodes: With COTS+certification, over 2 million units have been delivered for the "GW constellation" satellites.
Changjing Technology: formerly known as Changdian Technology's discrete device department, focusing on customized diodes for consumer, industrial, and automotive grades. Its technological highlights include:
Low VF Schottky diode: The VF of the same specification product is 25% lower than that of ordinary models, suitable for Xiaomi 5G router power modules;
High junction temperature TVS diode: With a maximum operating temperature of 175 ℃, it has passed Huawei's rigorous "three high tests" (high temperature, high humidity, and high vibration).
三, Customized Service Model and Case Analysis
1. Upgrade from standard products to customized services
DOWOSEMI: Provides full chain customization of "solution design device selection EMC testing mass production services". For example, developing a low-temperature diode that can withstand -55 ℃ for a certain drone enterprise, by optimizing the packaging material (using epoxy resin+ceramic composite structure) and pin design (increasing the thickness of the gold plating layer), the reliability of the product in extremely cold environments has been improved by three times.
Ropower: As a hybrid distributor, we act as agents for brands such as Weimeng and NJRC, while also providing customized services. For example, developing ultra small size (1.0mm × 0.6mm) ESD protection diodes for a networked enterprise, meeting the compact layout requirements of NB IoT modules by adopting DFN0603 packaging and low capacitance design (Cj=0.3pF).
2. Typical case: Customization breakthrough of satellite communication diodes
Leway Semiconductor: Developed TO Can packaged laser diodes for low orbit satellite communication needs, covering the full wavelength range of 2.5G/10G DFB, with high reliability (MTBF>500000 hours), high sensitivity (-28dBm), and compatibility (supporting GPON/XGPON protocols). This product has been applied in projects such as SpaceX Starlink and China's "GW Constellation", with a cumulative delivery of over 5 million units.
Jiejie Microelectronics: Developed low junction capacitance discharge tubes (TVS) for the Beidou satellite. By optimizing doping concentration and passivation layer thickness, the junction capacitance was reduced from 100pF to 10pF, while maintaining a surge withstand capacity of 20kA under 8/20 μ s waveform, meeting the satellite's anti-static discharge (ESD) requirements.