As the core detonation device in the civil explosive industry, the performance of the energy storage capacitor 

of electronic detonators directly affects the reliability, safety, and system cost of detonation. Surface mounted 

aluminum electrolytic capacitors exhibit significant advantages in electronic detonators due to their unique 

physical and electrical properties. The following analysis will be conducted from the perspectives of technical 

adaptability, performance comparison, and application scenarios:

1、 The core requirement of electronic detonators for energy storage capacitors

The electronic detonator control module needs to meet the requirements of high-energy instantaneous release, 

high temperature stability, long-term standby and low leakage current. Specific requirements include:

Large capacity value: meets the energy required for detonation of the shock agent (formula: C × Δ U=I × Δ t, the 

larger the capacity value, the higher the delay time and detonation reliability);

Low ESR (equivalent series resistance): reduces energy loss at the moment of detonation (excessive ESR 

can result in 43% of energy being consumed in the resistance);

Ultra low leakage current: Ensure energy retention of the energy storage capacitor during the delay phase 

(excessive leakage current may cause explosion rejection);

High voltage resistance: adapted to the high-pressure detonation scheme of shock agents (usually requiring 

a withstand voltage of ≥ 25V);

High temperature stability: It is necessary to maintain stable performance in an environment of 55 ℃.

2、 Technical adaptability of surface mount aluminum electrolytic capacitors

Capacity and volume optimization

Surface mount aluminum electrolytic capacitors achieve high capacitance density through solid-state conductive 

polymer materials, such as the Fulong EFRA series. For example, a solid aluminum electrolytic capacitor 

with a capacitance of 100 μ F/25V (size Φ 5 × 8mm) has a capacitance value 50% higher than a tantalum 

capacitor with the same withstand voltage (68 μ F/20V), and the cylindrical package is more suitable for

 the shell structure of electronic detonators.

Comparative advantage: Tantalum capacitors are limited by their voltage resistance and volume, and need 

to increase in size in high-voltage scenarios (such as 20V tantalum capacitors with a size of 6 × 3.2 × 2.5mm), 

while surface mount aluminum electrolytic capacitors achieve small volume and large capacity by optimizing the

 internal foil layer structure.

Low ESR and High Frequency Characteristics

The ESR of surface mount aluminum electrolytic capacitors can be as low as 0.1 Ω or less (such as the Fulong 

EFVH series), significantly better than domestic tantalum capacitors (ESR ≥ 1.6 Ω). At the moment of detonation, 

low ESR can reduce energy loss (formula: P=RESR × I ²), ensuring that the detonation bridge wire obtains 

sufficient energy. In addition, its high-frequency characteristics, such as the low impedance of conductive 

polymer materials, can support microsecond level rapid discharge.

Leakage current control

Through solid-state electrolyte technology, the leakage current of surface mount aluminum electrolytic 

capacitors can be controlled within 1 μ A at high temperatures (55 ℃), while the leakage current of tantalum 

capacitors (such as imported tantalum F-type) can reach up to 10 μ A, accounting for more than 30% of

 the module's standby current, which can easily lead to insufficient energy storage. This feature is crucial 

for long-term standby electronic detonators.

Voltage resistance and overcurrent capability

Surface mounted aluminum electrolytic capacitors support a withstand voltage of 25V or higher (such as 

EFRA025BK101M0411), and use plate anti-oxidation technology to withstand high current surges (such 

as transient currents ≥ 2A). In contrast, tantalum capacitors are prone to cause manganese dioxide decomposition 

and explosion during overcurrent, posing a safety hazard.

3、 Advantages in practical application scenarios

Structural adaptability

The PCB of the electronic detonator needs to be placed horizontally inside the cylindrical tube shell, and 

the packaging of the surface mounted aluminum electrolytic capacitor (such as DIP 4 × 11mm) can fit the 

center layout of the tube shell cross-section, saving space (the tube shell radius can be reduced to 2.5mm).

High temperature and reliability performance

Experimental data shows that the capacitance deviation of solid-state aluminum electrolytic capacitors 

under 55 ℃/20V conditions is less than 5%, and there is no significant change in ESR. However, the leakage 

current of tantalum capacitors increases exponentially with temperature (Figure 7-9). In addition, surface 

mount technology (such as SMT reflow soldering) can improve shock resistance and sealing, and adapt

 to harsh environments such as mines and underwater environments.

Cost and Supply Chain Stability

The raw material cost of aluminum electrolytic capacitors is only 1/3 to 1/5 of that of tantalum capacitors 

(tantalum metal relies on imports). Taking Fulong Electronics as an example, its automated production

 line can achieve a monthly production capacity of 400 million units, with a delivery cycle shortened to 

2 weeks, while the delivery time for imported tantalum capacitors is as long as six months.

4、 Limitations and improvement directions

Low temperature performance: Liquid electrolyte may freeze below -40 ℃, and a solid-liquid hybrid capacitor 

(such as EFBR series) should be used to improve the stability of low-temperature capacitance;

Life limit: Long term high-frequency charging and discharging may accelerate electrolyte aging, requiring 

ultra long life design (such as FRK series life ≥ 10000 hours);

Polarity risk: It is necessary to strictly label the polarity (marked with black stripes) to avoid reverse voltage 

breakdown.

5、 Typical application cases

Fulong Electronics EFRA025BK101M0411 (100 μ F/25V) has been widely used in high-voltage electronic

 detonators, with the following parameters:

Capacity value: 100 μ F ± 20% at room temperature, capacity value attenuation<8% at high temperature 

(55 ℃);

ESR: 0.08 Ω (1kHz), 80% lower than tantalum capacitors;

Leakage current: ≤ 0.01CV (2.5 μ A @ 25V).

conclusion

Surface mounted aluminum electrolytic capacitors have become the preferred solution for energy storage 

capacitors in electronic detonators due to their high capacitance, low ESR, high temperature stability, and 

cost advantages. Its technical adaptability has been verified through actual working conditions, and in

 the future, material innovation (such as nano coated anodes) can further improve energy density and 

lifespan, promoting the development of the civil explosive industry towards higher safety and intelligence.

About Us

Guangdong Fulong Electronic Technology Co., Ltd. is a private high-tech enterprise specializing in the research and development, manufacturing, and sales of aluminum electrolytic capacitors, certified by IATF16949，ISO9001, ISO14001, and ISO45001. The company has a building area of 17000 square meters and more than 50 automated production lines; The total investment is 50 million yuan (RMB), with more than 100 employees, including more than 20 engineering and technical, quality management, and production management personnel. The annual production of capacitors (4 * 5.4~16 * 21.5) is about 400 million pieces; Our products are mainly sold to domestic and international markets, and we strive to promote our company's products globally.

Jiangxi Fulong Electronic Technology Co., Ltd. is a wholly-owned subsidiary of Guangdong Fulong Electronic Technology Co., Ltd. established in Hukou County, Jiangxi Province with a total investment of 500 million yuan. It has 50 fully automated production lines and an annual output of approximately 1.2 billion capacitors (4 * 5.4~16 * 21.5).

Fulong Group has an international professional core technology research and development team for aluminum electrolytic capacitors and a global sales network. Rich experience in the design, research and development, and production management of aluminum electrolytic capacitors. The R&D team follows the technical design theory of aluminum electrolytic capacitors, complies with international and domestic legal and regulatory requirements (RoHs), and adheres to the highest international quality standards

Fulong Group has high-quality and stable raw material supply partners, and key raw materials (such as aluminum foil, electrolytic paper, etc.) are selected from well-known Japanese and Korean companies (KJCC KDKNKK, etc.), ensuring reliable and stable advantages in product quality, environmental protection, safety, and energy conservation.

Fulong Group has a group of highly qualified professional technicians and management personnel who can produce various series of sheet aluminum electrolysis products according to customer requirements. The products include high-frequency low impedance, low leakage, wide temperature, extremely low impedance, non-polar, ultra long life, medium high voltage long life, high reliability and other new types of special requirements for surface mount products; At the same time, the company's products can withstand a soldering temperature of 260 ℃, meeting the lead-free reflow soldering technology required for SMT in the whole machine factory. All technical indicators of the products have reached or exceeded the international level of similar products.

While strengthening management and expanding operational scale, Fulong Group is also committed to improving its competitiveness and customer satisfaction, continuously and steadily increasing customer and social trust, continuously meeting market demand, further optimizing environmental management and expanding social contributions, and developing together with the electronics industry.

Guangdong Follon Electronic Technology Co., Ltd.

Jiangxi Follon Electronic Technology Co., Ltd.

Address: Building 3, South District, Haishan Science and Technology Park, Hukou County, Jiujiang City, Jiangxi Province

www.follon.com

Professional manufacturer of high-quality surface mount electrolytic capacitors