IC-Mart Your Trusted Source for Current Sense Amplifier IC Chips

(from leading manufacturers)

International Manufacturers of Current Sense Amplifier IC

1. Texas Instruments (TI)

TI offers the most extensive product line in the industry. The INA series is the de facto standard for industrial applications. From the budget-friendly INA180 to high-precision digital monitors, TI provides excellent cost-to-performance ratios and robust design support.

2. Analog Devices (ADI)

Following its acquisitions of Maxim Integrated and Linear Technology, ADI rules the high-voltage and automotive-grade sectors. Models like the LT6100 and MAX44284 are renowned for their reliability in extreme environments.

3. STMicroelectronics (ST)

ST focuses on the general-purpose and industrial integration markets. Their TSC series is a staple in consumer electronics and white goods, offering a perfect balance of performance and price.

4. Microchip

Microchip specializes in multi-channel monitoring and high-efficiency designs. Their PAC series is widely used in data centers and complex battery management systems (BMS).

China Manufacturers of Current Sense Amplifier IC

1. Analog Output Type

These chips primarily target the TI INA18x, INA19x, and INA21x series, focusing on high bandwidth, low offset, and pin-to-pin compatibility.

Manufacturer	Part Number	Cross-Reference / Equivalent	Technical Highlights
SGMicro	SGM8199	TI INA210-215	Industrial-grade benchmark; supports bidirectional sensing; common-mode voltage up to 26V; ultra-compact SC70-6 package.
3Peak	TPA127	TI INA19x Series	High-side sensing; supports wide common-mode voltage; fast dynamic response; ideal for overcurrent protection.
Gainsil	GS19x	TI INA199/INA180	High cost-performance ratio; mass-produced for consumer electronics (e.g., robot vacuums, drones).
Novosns	NSCSA21x	TI INA21x	AEC-Q100 automotive qualified; enhanced tolerance for negative common-mode voltage (anti-backflow).

2. Digital Power Monitors

These chips integrate an ADC and I²C/SMBus interface, targeting TI’s flagship models like the INA226, INA219, and INA231.

Manufacturer	Part Number	Cross-Reference / Equivalent	Technical Highlights
SGMicro	SGM842	TI INA3221	Three-channel digital monitoring; simultaneously measures 3-way bus and shunt voltages; includes alert functions.
Chiphomer	CSM3226	TI INA226	1:1 Pin-to-Pin replacement; 2.7V~36V wide common-mode range; 16-bit resolution; one of the highest domestic substitution rates.
Shanghai Beling	BL6713	TI INA226/231	Focused on high-precision energy metering; widely used in server power supplies and base station monitoring.
ZDS	ZDS226	TI INA226	Developed for the domestic B2B market; parameters are fully aligned with international standards; offers better lead times.

3. Enhanced PWM Rejection Type

Specifically optimized for high-frequency noise in motor control applications (BLDC/Servo), targeting the TI INA240.

Manufacturer	Part Number	Cross-Reference / Equivalent	Technical Highlights
Novosns	NSCSA240	TI INA240	Excellent PWM rejection; common-mode range from -4V to 80V; performs exceptionally in servo motors and industrial inverters.
3Peak	TPA132	TI INA240	Features ultra-low gain drift and high CMRR; optimized for complex electromagnetic environments in industrial control.

4. Isolated Current Sensing

Provides electrical isolation for safety in New Energy Vehicles (OBC/DCDC) and high-voltage energy storage, targeting the TI AMC130x series.

Manufacturer	Part Number	Cross-Reference / Equivalent	Technical Highlights
Novosns	NSIC1306 / NSIC1311	TI AMC130x	Capacitive isolation technology; provides up to 5kVRMS isolation voltage; used for motor phase current sensing in 800V platforms.
3Peak	TPI2420	TI AMC1301/1302	Offers extremely high linearity and low propagation delay.

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Technical Classifications of CSA ICs

By Sensing Location

High-Side Sensing: Measured between the power source and the load.

Example: INA190 (TI) features ultra-low bias current.

Example: LT6105 (ADI) supports a wide -0.3V to 44V range, independent of supply voltage.

Low-Side Sensing: Measured between the load and ground.

Example: INA181 (TI) is cost-effective and fast.

Example: TSZ121 (ST) is a zero-drift op-amp often used for precision low-side sampling.

By Directionality

Unidirectional: Only measures current in one direction (e.g., TSC101, INA180).

Bidirectional: Measures charge and discharge cycles.

Example: INA210 (TI) uses a V_REF pin to set a midpoint voltage.

Example: AD8418A (ADI) is a high-resolution automotive-grade sensor.

By Output Type

Analog Output: Direct voltage output (e.g., MAX44284 for low power, MCP6C02 for EMI resistance).

Digital Output: Integrated ADC with I²C/SMBus communication.

Example: INA226 (TI) is the industry benchmark.

Example: PAC1934 (Microchip) supports 4-channel monitoring and energy accumulation.

By Gain Configuration

Fixed Gain: Internal resistors are pre-set for accuracy (e.g., MAX9611, NCV78763).

Programmable Gain (PGA): Gain can be adjusted via external pins (e.g., LTC6100).

Core Applications of Current Sense Amplifier IC

1. Power Management & Protection
   CSAs are the first line of defense in overcurrent protection. They trigger shutdown logic before a MOSFET or load can burn out. In data centers, they calculate real-time Power Usage Effectiveness (PUE).
2. Battery Management Systems (BMS)
   CSAs act as “Coulomb Counters” for smartphones and laptops. By monitoring bidirectional current, they estimate the State of Charge (SoC) with high precision.
3. Automotive Electronics
   In EVs, CSAs monitor the inverter and On-Board Charger (OBC). They also detect “stalled” motors in power windows or wipers by identifying current spikes.
4. Motor Control
   For Servo and BLDC motors, CSAs provide phase current monitoring. This allows for closed-loop torque control, even in the presence of high-frequency PWM noise.
5. Industrial Automation
   In PLCs and distributed I/O systems, CSAs facilitate predictive maintenance. They identify mechanical wear by detecting abnormal current signatures in factory machinery.