onsemi CS52015-1GSTR3

Overview

CS52015-1GSTR3 from onsemi is a 1.5 A adjustable linear regulator with ±1.0% output voltage accuracy, 1.05 V typical dropout at full load, and operation across 1.25 V to 5.5 V output range using external resistors. It delivers fast transient response and integrated overcurrent/thermal shutdown protection for microprocessor post-regulation and low-voltage embedded power rails.

For engineers reviewing the CS52015-1GSTR3 datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (SOT-223), confirmed thermal and electrical specs, validated alternative options, and design-critical implementation notes including capacitor selection, short-circuit protection limits, and thermal management guidance.

Technical Context

The CS52015-1GSTR3 uses a composite PNP-NPN pass transistor architecture optimized for low-dropout operation below 1.4 V at 1.5 A while maintaining stability with standard tantalum output capacitors. Its internal bandgap reference and error amplifier enable precise 1.25 V nominal reference voltage between VOUT and ADJ pins.

It implements current-limit protection active above 1.6 A and thermal shutdown triggered at 150°C junction temperature with 25°C hysteresis. The device requires no external compensation but mandates ≥22 µF tantalum output capacitance for stable operation under full-load transients.

Key Specifications

Pinout & Package

SOT-223 package (Case 318E), surface-mount, thermally enhanced with tab connected to VOUT. Pin 1 = Adj (low-side reference node), Pin 2 = VOUT (regulated output and thermal tab), Pin 3 = VIN (input supply).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable linear regulator applications.

Compared with LT1086CT-3.3#PBF and TLV1117-33CDCYR, the CS52015-1GSTR3 uniquely combines 1.5 A capability, ±1.0% accuracy, adjustable output, and 1.05 V dropout in SOT-223 - enabling higher-efficiency, multi-voltage designs without sacrificing thermal safety or transient performance.

Availability

CS52015-1GSTR3 is available at Aetrix Electronics and suitable for microprocessor power delivery, FPGA I/O regulation, and industrial control module applications requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for CS52015-1GSTR3 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and medical markets.

The CS52015-1GSTR3 belongs to onsemi's high-current linear regulator product line, designed specifically for post-regulation in noise-sensitive digital systems where low dropout, fast transient response, and integrated protection are mandatory.

FAQ

What is the maximum input-to-output voltage differential allowed for CS52015-1GSTR3?

The CS52015-1GSTR3 has an absolute maximum supply voltage rating of 7.0 V between VIN and VOUT. Exceeding this differential risks permanent damage, especially during short-circuit events where thermal or current-limit protection may not activate quickly enough to prevent SOA violation. This limit applies regardless of package type or ambient temperature.

Does CS52015-1GSTR3 require an external capacitor on the Adjust pin?

Yes, a 0.1 µF tantalum capacitor from the Adjust pin to ground is recommended in the CS52015-1GSTR3 datasheet to improve ripple rejection and transient response. While not strictly mandatory for basic regulation, omitting it degrades AC performance - particularly at 120 Hz and higher frequencies - and increases output voltage deviation during load steps.

Can CS52015-1GSTR3 be used without a heatsink in SOT-223 package?

The SOT-223 package of CS52015-1GSTR3 has a typical RJA of 156°C/W. At 1.5 A output with 2 V dropout (3 W dissipation), junction temperature rise exceeds 460°C - far above the 150°C thermal shutdown threshold. A heatsink or copper pour is mandatory; even modest PCB copper area reduces RJA significantly, but thermal calculation per application is required before omitting external heatsinking.

What output capacitor type and value does CS52015-1GSTR3 require for stability?

The CS52015-1GSTR3 requires a minimum 22 µF tantalum capacitor at the output for guaranteed stability. Aluminum electrolytic capacitors are acceptable but exhibit wider ESR variation at low temperatures. Ceramic or film capacitors with near-zero ESR are unstable and must be avoided unless explicitly compensated per onsemi's stability guidelines in the datasheet.

Is CS52015-1GSTR3 pin-compatible with other SOT-223 linear regulators?

The CS52015-1GSTR3 uses standard SOT-223 pinout (Adj-VOUT-VIN), matching industry convention. However, direct substitution with non-onsemi parts requires verification of reference voltage, dropout behavior, and protection thresholds - e.g., the TLV1117 family shares pinout but differs in accuracy, current limit, and thermal response, making it unsuitable as a drop-in replacement without validation.