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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi CS5201-3GT3

Name: CS5201-3GT3
Brand: onsemi
SKU: CS5201-3GT3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CS5201-3GT3

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-220-3

Datasheet:: CS5201-3GT3.pdf

Description:: IC REG LINEAR 3.3V 1A TO220AB

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Product details

Overview

CS5201-3GT3 from onsemi is a fixed-output 3.3 V, 1.0 A linear regulator in TO-220-3 package with ±1.5% output voltage accuracy, 1.0 V typical dropout at full load, and integrated overcurrent and thermal shutdown protection. It serves as a post-regulator and microprocessor supply where low-voltage operation and fast transient response are critical.

For engineers reviewing the CS5201-3GT3 datasheet, pinout, applications, or equivalent options, key selection considerations include dropout voltage under 1.2 V at 1.0 A, quiescent current ≤10 mA at full load, thermal shutdown activation at 150°C, and compatibility with tantalum output capacitors for stability in high-dI/dt digital loads.

Technical Context

The CS5201-3GT3 employs a composite PNP-NPN output stage optimized for low dropout and fast loop response. Its error amplifier drives a bandgap reference and integrates current limit and thermal shutdown comparators with hysteresis (25°C).

Stability requires a minimum 22 µF tantalum output capacitor due to ESR-dependent phase margin; ceramic-only networks risk oscillation. The device operates with input voltages up to 7.0 V and junction temperatures up to 150°C, with R_JA = 50°C/W (TO-220) enabling heatsink-based thermal management in continuous 1.0 A applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3 V ±1.5% (±49.5 mV tolerance over temperature)
Max Output Current	1.0 A continuous (supports microprocessor core rails with step-load transients)
Dropout Voltage	1.0 V typical @ 1.0 A (enables operation from 4.3 V input in 3.3 V systems)
Quiescent Current	10 mA max @ full load (minimizes no-load power loss in always-on subsystems)
Thermal Shutdown	150°C activation with 25°C hysteresis (prevents latch-up during sustained overload)
Ripple Rejection	80 dB @ 120 Hz (attenuates switching regulator ripple in hybrid power architectures)
Line Regulation	0.20% max (maintains output stability across 2.0–3.7 V input differential)

Pinout & Package

CS5201-3GT3 uses the TO-220-3 package (Case 221A), with the metal tab electrically connected to VOUT for direct heatsinking. Pin 1 is GND, Pin 2 is VOUT (tab), and Pin 3 is VIN.

Pin/Terminal	Circuit Role	Design Meaning
1 (GND)	Ground reference	Common return path for error amplifier, reference, and protection circuits; must be low-impedance to minimize load regulation error
2 (VOUT)	Regulated output	Delivers 3.3 V to load; tab connection enables mechanical mounting to heatsink without isolation hardware
3 (VIN)	Input supply	Accepts 4.3–7.0 V DC input; requires ≥10 µF input capacitor to suppress source impedance effects

Key Features

Feature	Design Value
Pb-free TO-220-3 package	Complies with RoHS Directive 2011/65/EU without requiring lead-free reflow profile changes
Fast transient response	Stabilizes within <10 µs after 100 mA–1.0 A load steps (critical for FPGA I/O bank sequencing)
Integrated fault protection	Current limit (1.0–3.1 A) + thermal shutdown (150°C) prevent damage during short-circuit or overheating events
Low dropout architecture	1.0 V typical dropout enables use with 5 V intermediate bus in multi-rail systems

Applications

Microprocessor Core Supply	FPGA I/O Bank Regulator
Use Scenario: Powering ARM Cortex-A series CPU cores requiring stable 3.3 V at up to 1.0 A with tight voltage tolerance. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise 3.3 V from a higher intermediate rail. Use Value: ±1.5% output accuracy and 80 dB ripple rejection ensure logic-level integrity and reduce timing jitter in clock domains.	Use Scenario: Supplying configurable I/O banks on Xilinx Artix-7 FPGAs where voltage must remain within 3.3 V ±5% during hot-swap transitions. IC Role / Device Role / Timing Role: Local point-of-load regulator with fast transient response to handle I/O switching currents. Use Value: 10 µs transient recovery minimizes I/O voltage droop during simultaneous switching output (SSO) events.
Industrial PLC Digital I/O Module	Medical Diagnostic Sensor Interface
Use Scenario: Providing isolated 3.3 V power to optocoupled digital input/output circuits in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Robust local regulator tolerant of wide ambient temperature swings (−40°C to +70°C). Use Value: Thermal shutdown hysteresis (25°C) prevents cycling during sustained 70°C ambient operation with 1.0 A load.	Use Scenario: Powering low-noise analog front-end sensors (e.g., photodiode amplifiers) in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-ripple, low-noise analog supply rail decoupled from noisy digital subsystems. Use Value: 80 dB ripple rejection at 120 Hz eliminates switching artifacts from upstream AC/DC converters in battery-backed systems.

Microprocessor Core Supply

FPGA I/O Bank Regulator

Use Scenario: Powering ARM Cortex-A series CPU cores requiring stable 3.3 V at up to 1.0 A with tight voltage tolerance.

IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise 3.3 V from a higher intermediate rail.

Use Value: ±1.5% output accuracy and 80 dB ripple rejection ensure logic-level integrity and reduce timing jitter in clock domains.

Use Scenario: Supplying configurable I/O banks on Xilinx Artix-7 FPGAs where voltage must remain within 3.3 V ±5% during hot-swap transitions.

IC Role / Device Role / Timing Role: Local point-of-load regulator with fast transient response to handle I/O switching currents.

Use Value: 10 µs transient recovery minimizes I/O voltage droop during simultaneous switching output (SSO) events.

Industrial PLC Digital I/O Module

Medical Diagnostic Sensor Interface

Use Scenario: Providing isolated 3.3 V power to optocoupled digital input/output circuits in DIN-rail mounted controllers.

IC Role / Device Role / Timing Role: Robust local regulator tolerant of wide ambient temperature swings (−40°C to +70°C).

Use Value: Thermal shutdown hysteresis (25°C) prevents cycling during sustained 70°C ambient operation with 1.0 A load.

Use Scenario: Powering low-noise analog front-end sensors (e.g., photodiode amplifiers) in portable ultrasound devices.

IC Role / Device Role / Timing Role: Low-ripple, low-noise analog supply rail decoupled from noisy digital subsystems.

Use Value: 80 dB ripple rejection at 120 Hz eliminates switching artifacts from upstream AC/DC converters in battery-backed systems.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT1086CT-3.3	Pin-compatible but higher 1.3 V dropout at 1.5 A; ±2% output accuracy; higher 12 mA quiescent current	Requires higher input headroom; less suitable for 4.3 V input systems	Select LT1086CT-3.3 only if legacy design reuse mandates identical footprint and thermal performance is secondary
TLV1117-33CDR	Lower 800 mA output current; 1.2 V dropout at 800 mA; SOT-223 only; no thermal hysteresis	Not suitable for sustained 1.0 A loads; limited thermal robustness in enclosed enclosures	Choose TLV1117-33CDR for cost-sensitive, lower-current applications where board space is constrained

Compared with LT1086CT-3.3 and TLV1117-33CDR, the CS5201-3GT3 delivers tighter output accuracy (±1.5% vs. ±2%), lower dropout (1.0 V vs. 1.3 V), and verified thermal hysteresis-making it optimal for thermally demanding 1.0 A microprocessor supplies where input headroom and long-term reliability are prioritized.

Availability

CS5201-3GT3 is available at Aetrix Electronics and suitable for industrial PLC modules, medical sensor interfaces, FPGA I/O banks, and microprocessor core supplies requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for CS5201-3GT3 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, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.

The CS5201-3GT3 belongs to onsemi's linear regulator product line designed specifically for high-current, low-dropout post-regulation in microprocessor and FPGA power delivery networks where precision, transient response, and integrated protection are essential.

FAQ

What is the maximum input voltage rating for the CS5201-3GT3?

The CS5201-3GT3 has an absolute maximum supply voltage (VIN) of 7.0 V. Operation above this level risks permanent damage. For reliable long-term use, the recommended operating range is VIN = VOUT + VDROPOUT to 7.0 V - i.e., 4.3 V to 7.0 V when delivering 1.0 A at 3.3 V. Exceeding 7.0 V violates the Absolute Maximum Ratings table and voids reliability guarantees.

Does the CS5201-3GT3 require an external output capacitor, and what type is recommended?

Yes, the CS5201-3GT3 requires an external output capacitor for stability. A minimum 22 µF tantalum capacitor is specified - aluminum electrolytic may be used for cost-sensitive designs, but ceramic-only networks are unstable due to near-zero ESR. The CS5201-3GT3 datasheet explicitly warns against film or ceramic capacitors alone, as they cause oscillation. Parallel combinations (e.g., 22 µF tantalum + 1 µF ceramic) improve transient response without compromising stability.

Is the CS5201-3GT3 pin-compatible with other regulators, and which ones?

Yes, the CS5201-3GT3 is explicitly documented as pin-compatible with the LT1086 family of linear regulators in TO-220-3, D2PAK-3, and SOT-223 packages. This allows drop-in replacement in existing layouts using LT1086CT-3.3 or LT1086CM-3.3, provided thermal and dropout requirements are re-verified. Pin mapping (GND-VOUT-VIN) matches exactly across all three packages.

What thermal resistance values apply to the CS5201-3GT3 in TO-220-3 package?

The CS5201-3GT3 in TO-220-3 package has R_JC = 3.5°C/W (junction-to-case) and R_JA = 50°C/W (junction-to-ambient, typical, no heatsink). When mounted to a heatsink, total thermal resistance becomes R_JA = R_JC + R_CS + R_SA, where R_CS depends on thermal interface material and mounting pressure. The datasheet confirms R_JC is process- and die-size dependent and validated for high-current operation.

How does the CS5201-3GT3 handle short-circuit conditions?

The CS5201-3GT3 incorporates foldback current limiting and thermal shutdown to survive short-circuit events. Under short-circuit, output current is limited to 1.0–3.1 A (depending on VIN–VOUT differential), and junction temperature rises until thermal shutdown activates at 150°C. After shutdown, the device remains off until junction temperature drops by 25°C (hysteresis), then automatically recovers. This dual-protection scheme prevents destruction during sustained faults without external circuitry.

CS5201-3GT3 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 7V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.2V @ 1A

Current - Output:: 1A

Current - Quiescent (Iq):: 10 mA

Current - Supply (Max):: -

PSRR:: 80dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

CS5201-3GT3 FAQ

1.How can I place an order for CS5201-3GT3 through Aetrix?

Please submit a Request for Quotation (RFQ) for CS5201-3GT3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CS5201-3GT3 reliable?

The price and inventory of CS5201-3GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5201-3GT3 is usually 5 days.

3.What payment methods are accepted for CS5201-3GT3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5201-3GT3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CS5201-3GT3?

CS5201-3GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CS5201-3GT3 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CS5201-3GT3?

For technical support, including CS5201-3GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5201-3GT3 requirements.

6.How does Aetrix verify that CS5201-3GT3 is sourced from the original manufacturer or authorized distributors?

All CS5201-3GT3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CS5201-3GT3 meets industry standards.

7.What is the process for return or replacement of CS5201-3GT3?

All CS5201-3GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5201-3GT3, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CS5201-3GT3 part is unused and in its original packaging.

Return procedure for CS5201-3GT3:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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