STMicroelectronics CS30AL

Overview

CS30AL from STMicroelectronics is a high-side current sense amplifier with fixed 20 V/V gain, operating over 2.8–30 V input common-mode voltage independent of 4–24 V supply, ±0.9 mV max input offset, and 300 µA max quiescent current in SOT23-5L package - used for precision shunt-based current monitoring in wireless battery chargers and portable equipment.

For engineers reviewing the CS30AL datasheet, CS30AL pinout, CS30AL application, or CS30AL equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, application-specific use cases, and confirmed alternative options - all grounded in ST's production data DocID026040 Rev 1.

Technical Context

The CS30AL implements a high-voltage, rail-to-rail output current-sense architecture with independent input common-mode and supply voltage domains. Its internal gain-setting resistors fix Av = 20 V/V, and its input stage supports differential sensing up to ±60 V survival rating under load-dump conditions.

CMR ≥90 dB and SVR ≥90 dB ensure stable output accuracy across wide Vicm (2.8–30 V) and VCC (4–24 V) variations. Output settling time is 3 µs to 1% with 47 pF load, and total output voltage accuracy is ±2.5% at Vsense = 50 mV and Tamb = 25°C.

Key Specifications

Pinout & Package

SOT23-5L plastic package (ECOPACK® compliant), 5-pin surface-mount, 2.9 mm × 2.8 mm footprint, 1.05 mm height, thermal resistance R_thJA = 250 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current sense amplifier applications.

Compared with CS30AL, INA240A1 offers superior common-mode range and output drive but consumes 6× more current and occupies 3× more board area; MAX4080TASA+ matches footprint and gain but omits load-dump hardening critical for automotive-adjacent portable chargers.

Availability

CS30AL is available at Aetrix Electronics and suitable for wireless battery chargers, portable equipment chargers, and wearable health monitors requiring stable component supply across multi-year production cycles.

Supply support for CS30AL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The CS30 series belongs to ST's precision analog current-sense amplifier product line, engineered specifically for high-voltage, low-quiescent-current, high-accuracy shunt-based current monitoring in compact portable and wireless power systems.

FAQ

What is the maximum allowable shunt voltage (Vsense) for CS30AL?

The CS30AL supports differential input voltages up to ±60 V between Vp and Vm pins per absolute maximum ratings, but its linear output range is limited by gain and supply. With Av = 20 V/V and VCC = 12 V, maximum usable Vsense is 600 mV to avoid output saturation - confirmed by Figure 17 in DocID026040 Rev 1 showing full-scale linearity up to 1 V input.

Can CS30AL operate with VCC lower than the input common-mode voltage?

Yes - the CS30AL's input common-mode and supply domains are fully independent. It operates with Vicm = 2.8–30 V while VCC is as low as 4 V, enabling high-side sensing on 24 V buses powered from 5 V logic rails. This is explicitly guaranteed in Table 4 (Operating Conditions) and Section 1 of the datasheet.

Does CS30AL require external filtering on the output?

No external RC filter is required for basic operation, but ST recommends limiting load capacitance to ≤47 pF (per Table 8) to ensure stability and 3 µs settling. Adding larger capacitors risks oscillation; if filtering is needed, use a series resistor (≥10 Ω) between Out and capacitor to isolate capacitive load.

How does the marking 'O104' correlate to CS30AL?

'O104' is the top-side laser marking for CS30AL devices in SOT23-5L tape-and-reel packaging, as specified in Table 1 of the datasheet. It uniquely identifies the 20 V/V gain variant and distinguishes it from CS30BL (O105) and CS30CL (O106), ensuring correct assembly-line placement and traceability.