Summary

CBMG719 is a CMOS SPDT analog switch developed by Corebai, designed to meet high-precision signal switching requirements in industrial control, communication systems, and medical equipment. Featuring low on-resistance, high-speed switching characteristics, wide voltage adaptability, and ultra-low power consumption, this product supports 1.8V~5.5V single power supply and operates across-40℃ to +125℃ temperature ranges, making it suitable for diverse scenarios from portable devices to industrial-grade systems. Through SOT-23-6 and MSOP-8 compact packaging, CBMG719 achieves <0.01μW static power consumption while ensuring 200MHz high-bandwidth signal transmission. Its "cut-off-before-on" switching mechanism and high isolation characteristics provide reliable protection for sensitive signal chains, establishing it as a high-performance solution in analog signal routing.

 

1、Application technology background: the demand and challenge of analog switch market

In the era of rapid development in industrial automation, consumer electronics, and medical electronics, analog switches as core components in signal chains are facing multiple technical challenges: The increasing integration of devices compels switches to evolve towards smaller sizes and lower power consumption (e.g., smartwatches require long battery life in confined spaces); Industrial and communication systems demand enhanced integrity in high-frequency signal transmission (5G RF, HD video) with high bandwidth and low crosstalk characteristics; Extreme environments (high-temperature workshops, automotive scenarios) require stable operation across wide temperature ranges.

In this context, the market urgently needs an analog switch with low resistance, high speed, wide temperature and low power consumption characteristics to fill the technical gap in the field of high precision signal switching. CBMG719 is a targeted solution for these requirements.

2、The positioning and core value of CBMG719

To address technical challenges in the analog switch market, CBMG719 adopts a design philosophy of "high precision, high reliability, and low power consumption". Through innovations in CMOS process technology and architectural optimization, it achieves multiple breakthroughs in key performance metrics. As a single-pole double-throw (SPDT) analog switch, its core function enables selective conduction of two signal paths under digital control, ensuring distortion-free and short-circuit-proof switching processes.

Compared to traditional products, the CBMG719's core value is demonstrated in three dimensions: First, it reduces signal transmission loss through low on-resistance and high flatness, making it suitable for high-precision measurement scenarios. Second, with its fast switching time and 200MHz bandwidth, it supports real-time routing of high-frequency signals, meeting communication and video transmission requirements. Third, featuring wide-voltage power supply and temperature-resistant design, it covers applications from battery-powered devices to industrial-grade systems while extending device lifespan through ultra-low power consumption. These characteristics enable the CBMG719 to not only replace traditional components like mechanical reed relays but also meet the stringent signal switching demands of next-generation electronic devices.

3、From electrical performance to reliability design

1. Wide voltage adaptability and low power consumption characteristics

The CBMG719 supports 1.8V~5.5V single power supply (absolute maximum-0.3V to +7V), compatible with lithium batteries (3.7V), industrial standard power supplies (5V), and low-voltage systems (1.8V). It adapts to diverse scenarios without requiring additional power conversion modules. In terms of power consumption control, its static power performance stands out remarkably: when powered by 3V or 5V, the typical static current (IDD) is only 0.001μA, with a maximum value ≤1.0μA. The static power consumption is <0.01μW, which is merely one ten-thousandth of traditional switches, significantly extending the battery-powered equipment's operational duration.

2. Low on-resistance and high flatness

Conduction resistance serves as the core performance metric for analog switches, directly impacting signal transmission loss. The CBMG719 achieves a typical conduction resistance (RON) of 2.5Ω at 5V supply, with a maximum of 7Ω. Even under 3V low-voltage conditions, it maintains a typical value of 6Ω and a maximum of 12Ω – significantly lower than the 10Ω+ level of comparable products. More importantly, its conduction resistance flatness (RFLAT(ON)) delivers exceptional performance: 0.75Ω at 5V supply with a maximum of 1.5Ω; 2.5Ω at 3V supply, ensuring minimal resistance fluctuations across the full 0V to VDD signal range. At ——5V supply, the 0.75Ω flatness keeps audio signal transmission loss deviations below 0.3%, effectively resolving audio distortion issues caused by traditional switch resistances. This makes it particularly suitable for high-precision applications such as audio systems and sensor integration.

3. High speed switch and high bandwidth transmission

The CBMG719 features ultra-fast switching capabilities with a maximum conduction time (tON) of 12ns and a maximum cutoff time (tOFF) of 6ns, ensuring real-time switching of high-frequency signals. Its-3dB bandwidth exceeds 200MHz, enabling lossless transmission of video signals (e.g., 1080P HD) and radio frequency signals (e.g., 5G intermediate frequency). This design meets the high-frequency requirements of communication systems and multimedia devices. Additionally, the inter-channel conduction resistance difference (ΔRON) typically measures 0.1Ω with a maximum of 0.4Ω, ensuring consistent signal transmission characteristics between channels and preventing amplitude deviations during switching operations.

4. High isolation and low crosstalk

To ensure signal integrity, the CBMG719 demonstrates exceptional isolation performance: The typical turn-off isolation level reaches-67dB at 10MHz and-87dB at 1MHz, effectively preventing signal leakage from the turn-off channel to the conduction channel. Inter-channel crosstalk measures-62dB at 10MHz and-68dB at 1MHz (reaching-82dB at 1MHz with 3V power supply), effectively avoiding mutual interference between signal channels, making it particularly suitable for multi-channel signal acquisition systems (e.g., medical multi-lead monitoring). Additionally, the typical source leakage current (IS (Off)) during turn-off and channel leakage currents (ID, IS (On)) during conduction are both ±0.01nA, with a maximum of ±0.25nA. This extremely low leakage current ensures distortion-free transmission of weak signals (such as μV-level ECG signals).

5. Safety switching mechanism and wide temperature reliability

The CBMG719 employs a "Break-before-Making" switching mechanism. During digital control signal transitions, it first disconnects the current conduction channel (S1) before activating another channel (S2). With a switching delay range of 1-8ns, this design prevents short-circuit risks caused by simultaneous conduction of two signals, ensuring safe operation in sensitive scenarios such as medical equipment and industrial control systems.

In terms of environmental adaptability, this product operates within a temperature range of-40℃ to +125℃ and can be stored at-65℃ to +150℃, with a maximum junction temperature of 150℃. It performs reliably in extreme environments such as high-temperature workshops and cold outdoor conditions, meeting both industrial-grade and automotive-grade application requirements. Featuring an ESD protection rating of 1kV, it demonstrates strong anti-static capabilities that effectively reduce damage risks during production and usage processes.

6. Packaging and interface design

The CBMG719 offers two packaging options: a 6-pin SOT-23 and an 8-pin MSOP. The compact SOT-23-6 package is ideal for space-constrained portable devices, while the MSOP-8 package features flexible pin layouts for PCB routing. The pins are clearly defined with D terminals serving as both input and output ports, S1 and S2 terminals providing dual signal channels, and IN terminals compatible with TTL/CMOS logic. The high-voltage input (VINH) reaches ≥2.4V in 5V power supply configurations and ≥2.0V in 3V power supply configurations. The low-voltage input (VINL)≤0.8V) enables direct connection to digital chips like MCUs and DSPs without level conversion.

 

4、Application scenario: From consumer electronics to industrial control

1. Battery power supply system: signal switching of smart wearable devices

In battery-powered devices such as smartwatches and TWS earbuds, seamless switching between sensor signals (e.g., heart rate and acceleration) and audio signals is essential. The CBMG719 features a 1.8V~5.5V wide-voltage range compatible with 3.7V lithium batteries, with a 0.001μA static current that minimizes standby power consumption and extends device endurance to over 7 days. Its 2.5Ω low-on-resistance design effectively reduces signal attenuation at μV levels, ensuring measurement accuracy for heart rate sensors. The SOT-23-6 compact package (3×2mm) saves PCB space, while its 200MHz bandwidth supports high-quality audio signal transmission, meeting users' dual demands for extended battery life and precise measurement.

2. Communication system: 5G base station radio frequency signal routing

The base station's multi-band signal switching requires high-bandwidth, low-loss analog switches. The CBMG719's 200MHz bandwidth ensures distortion-free RF signal transmission, while its-67dB@10MHz turn-off isolation prevents inter-band interference. The 12ns fast switching time guarantees zero delay during band transitions, and the 2.5Ω on-resistance at 5V power supply reduces signal attenuation. Its-40℃~+125℃ wide temperature range adapts to outdoor base station environments. The MSOP-8 package delivers 206℃/W thermal resistance (θJA) and 315mW power consumption, ensuring long-term stable operation and enhanced signal transmission efficiency.

3. Medical equipment: portable electrocardiogram monitor lead switching

The cardiac monitoring device requires seamless switching between multiple leads while maintaining stringent requirements for signal integrity and safety. The CBMG719 features a leakage current of ±0.01nA, significantly reducing distortion risks in μV-level ECG signals. Its "cut-off-before-connect" mechanism prevents signal short-circuiting during lead switching, ensuring data accuracy. With over 60dB crosstalk isolation, it effectively blocks multi-lead interference. Operating across-40℃ to +125℃ temperature ranges, it adapts to diverse clinical environments. Powered by 1.8V to 5V compatible with built-in lithium batteries, the device achieves <0.01μW static power consumption, extending battery life to over 24 hours – meeting the rigorous demands of portable medical devices.

4. Video switch: HD set-top box signal switch

The HD set-top box must support switching between multiple video signals including HDMI and AV, requiring high bandwidth and low signal loss. The CBMG719 features 200MHz bandwidth for 1080P video transmission, with a 2.5Ω conduction resistance that minimizes signal attenuation to ensure crystal-clear picture quality. Its-87dB@1MHz shutdown isolation prevents interference from unselected channels, while 12ns fast switching delivers zero lag. The SOT-23-6 package enables compact design for set-top boxes, and the 5V power supply with TTL-compatible interface simplifies circuit design, enhancing both stability and smoothness in signal switching.

5. Industrial automation: Robot sensor signal switching

Industrial robots' multi-sensor signals (including vision and force sensing) require signal switching capabilities adapted for high-temperature workshop environments. The CBMG719 features a wide temperature range of-40℃ to +125℃, enabling operation from-40℃ low temperatures to +125℃ high temperatures. It delivers 30mA continuous current (S/D terminal) to carry sensor signals while providing 800-1200mA current-limiting protection against overload damage. Its "de-energize before energizing" mechanism prevents sensor signal short circuits, while a 2.5Ω conduction resistance ensures measurement accuracy. The MSOP-8 packaged 206℃/W thermal resistance (θJA) guarantees effective heat dissipation, significantly enhancing the reliability of robotic control systems.