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onsemi CS5201-3GSTR3
- Part No.:
- CS5201-3GSTR3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
CS5201-3GSTR3.pdf
- Description:
- IC REG LINEAR 3.3V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,785
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Product details
Overview
CS5201-3GSTR3 from onsemi is a fixed-output 3.3 V, 1.0 A linear regulator in SOT-223 package with ±1.5% output accuracy, 1.0 V typical dropout at full load, and integrated overcurrent/thermal shutdown protection. It serves as a post-regulator or microprocessor supply where low-voltage operation and fast transient response are critical.
For engineers reviewing the CS5201-3GSTR3 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage under 1.2 V at 1.0 A, quiescent current ≤10 mA at full load, thermal shutdown activation at 150–210°C, and compatibility with tantalum output capacitors for stability.
Technical Context
The CS5201-3GSTR3 employs a composite PNP-NPN output stage and internal bandgap reference with error amplifier feedback to maintain regulation. Its loop design enables fast transient response-evidenced by <±10 mV deviation during 1-A load steps-and supports stable operation with ≥22 µF tantalum output capacitance.
It operates within −40°C to +70°C ambient temperature, requires VIN < 7.0 V, and delivers regulated 3.3 V output without external resistors. Protection circuitry includes foldback current limiting (1.0–3.1 A) and thermal shutdown with 25°C hysteresis, ensuring safe operation under overload or elevated junction temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% (3.25–3.35 V), enabling precise logic-level supply for 3.3 V microprocessors and FPGAs. |
| Max Output Current | 1.0 A continuous, sufficient for core power of mid-tier MCUs and SoCs in embedded control systems. |
| Dropout Voltage | 1.0 V typical @ 1.0 A; allows operation with VIN as low as 4.3 V, reducing input supply overhead. |
| Quiescent Current | ≤10 mA @ full load, minimizing no-load power loss in always-on subsystems. |
| Ripple Rejection | 80 dB @ 120 Hz, suppressing low-frequency noise from upstream switching regulators or AC-DC supplies. |
| Thermal Shutdown | Trips at 150–210°C junction temperature with 25°C hysteresis, preventing permanent damage during sustained overload. |
| Line Regulation | 0.02% typical (0.20% max), ensuring stable output despite ±1 V input variation across operating range. |
Pinout & Package
SOT-223 package (Case 318E), surface-mount, thermally enhanced with exposed tab connected to VOUT. Pin 1 = GND, Pin 2 = VOUT (tab), Pin 3 = VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal bias and error amplifier; must be low-impedance connection to minimize load regulation error. |
| 2 (VOUT) | Regulated output | Delivers 3.3 V to load; tab is electrically connected to this pin-requires insulated heatsinking if case isolation needed. |
| 3 (VIN) | Input supply | Accepts 4.3–7.0 V DC input; must be decoupled with ≥10 µF capacitor close to pin to ensure stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-10 mV output deviation during 1-A load step, critical for digital ICs with dynamic current demands. |
| Tantalum capacitor compatible | Stable with ≥22 µF tantalum output cap; avoids instability risks associated with low-ESR ceramic caps alone. |
| Integrated fault protection | Current limit (1.0–3.1 A) and thermal shutdown (150–210°C) prevent catastrophic failure without external circuitry. |
| Pb-free packaging | SOT-223 package meets RoHS requirements; reflow-compatible per J-STD-020 (230°C peak). |
| Low dropout operation | 1.0 V typical dropout enables use with 5 V input rails while maintaining 3.3 V output under full 1 A load. |
Applications
| Industrial PLC I/O Module | Embedded Microcontroller Power |
|---|---|
Use Scenario: Powering isolated digital I/O channels in programmable logic controllers requiring clean, stable 3.3 V for level-shifting and sensor interfacing. IC Role / Device Role / Timing Role: Primary 3.3 V post-regulator downstream of a 5 V buck converter, delivering low-noise supply to optocoupler drivers and ADC reference buffers. Use Value: 80 dB ripple rejection suppresses switching noise from upstream DC-DC, preserving signal integrity in analog front-ends. | Use Scenario: Supplying core voltage to ARM Cortex-M4 microcontrollers in battery-backed industrial gateways. IC Role / Device Role / Timing Role: Fixed-output LDO providing regulated 3.3 V to MCU VDD and peripheral I/O banks during variable load conditions. Use Value: Fast transient response maintains voltage within ±1.5% spec during 100-ms burst-mode CPU activity, avoiding brownout resets. |
| Network Router Control Plane | Medical Diagnostic Sensor Interface |
Use Scenario: Powering management ASICs and PHY interface logic in enterprise-grade Ethernet switches. IC Role / Device Role / Timing Role: Secondary regulator supplying 3.3 V to switch fabric controllers and packet buffer memory interfaces. Use Value: 1.0 A current capability supports simultaneous activation of multiple high-speed SerDes lanes without output sag. | Use Scenario: Providing precision 3.3 V bias to analog front-end amplifiers and sigma-delta ADCs in portable ultrasound transducers. IC Role / Device Role / Timing Role: Low-noise, thermally robust LDO powering sensitive analog signal chain components adjacent to heat-generating digital sections. Use Value: Thermal shutdown hysteresis prevents nuisance cycling during intermittent high-power Doppler processing bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1086CM-3.3#PBF | Pin-compatible but higher quiescent current (up to 15 mA), lower ripple rejection (70 dB), and wider dropout tolerance (1.3 V max). | Less suitable for ultra-low-noise analog rails; acceptable for general-purpose 3.3 V logic supply where thermal margin is ample. | Select when legacy LT1086 footprint reuse is required and 10 mA quiescent current is not critical. |
| TPS7A4700RGWR | Not pin-compatible; ultra-low noise (4.7 µVRMS), higher cost, 1 A rated but requires external compensation and 2.2 µF ceramic output cap. | Targeted at high-precision analog systems (e.g., audio, RF), not cost-sensitive digital power rails. | Choose only when sub-10 µVRMS noise is mandatory and board redesign is acceptable. |
Compared with LT1086CM-3.3#PBF and TPS7A4700RGWR, the CS5201-3GSTR3 offers optimal balance of low dropout (1.0 V), proven tantalum-cap stability, and integrated protection-making it ideal for space-constrained, thermally demanding digital power applications without requiring external compensation or ultra-low-noise performance.
Availability
CS5201-3GSTR3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded microcontroller power rails, and network router control planes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CS5201-3GSTR3 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The CS5201-3GSTR3 belongs to onsemi's linear regulator product line designed specifically for high-current, low-dropout post-regulation in space-constrained embedded systems where reliability and thermal robustness are essential.
FAQ
What is the maximum input voltage rating for the CS5201-3GSTR3?
The CS5201-3GSTR3 has an absolute maximum supply voltage (VIN) of 7.0 V. Operation above this value risks permanent damage. For reliable long-term use, VIN should remain ≤7.0 V under all conditions including transients and ripple peaks. The CS5201-3GSTR3 is optimized for inputs between 4.3 V (3.3 V + 1.0 V dropout) and 7.0 V.
Does the CS5201-3GSTR3 require an external output capacitor, and what type is recommended?
Yes, the CS5201-3GSTR3 requires an external output capacitor for stability. A minimum 22 µF tantalum capacitor is recommended-aluminum electrolytic is acceptable but less stable at low temperatures. Ceramic capacitors alone are not recommended due to near-zero ESR, which can cause oscillation. The CS5201-3GSTR3 datasheet confirms stable operation with ≥22 µF tantalum.
Is the CS5201-3GSTR3 pin-compatible with other regulator families?
Yes, the CS5201-3GSTR3 is explicitly stated as pin-compatible with the LT1086 family of linear regulators in its datasheet. This applies to the SOT-223 variant (ST suffix), meaning identical pin 1 (GND), pin 2 (VOUT), and pin 3 (VIN) assignments and mechanical footprint-enabling drop-in replacement in existing LT1086-based designs.
What thermal considerations apply when using the CS5201-3GSTR3 at full 1.0 A load?
At 1.0 A, the CS5201-3GSTR3's SOT-223 package has a typical RJA of 156°C/W. With a 3.7 V input (0.4 V dropout × 1.0 A = 0.4 W dissipation), junction temperature rise is ~62°C above ambient. To stay below the 150°C max junction limit, ambient must remain ≤88°C-or a heatsink, thermal pad, or PCB copper pour is required. The CS5201-3GSTR3 thermal shutdown activates at 150–210°C to prevent damage.
How does the CS5201-3GSTR3 handle short-circuit conditions?
The CS5201-3GSTR3 incorporates foldback current limiting that reduces output current to ~1.0 A during short-circuit events, preventing destructive power dissipation. Combined with thermal shutdown (150–210°C trip), this protects the device during sustained faults. Short-circuit current varies with VIN−VOUT differential, dropping to ~1.0 A at 3.0 V differential per the datasheet's Figure 8. The CS5201-3GSTR3 does not latch off-it recovers automatically once fault clears.
CS5201-3GSTR3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-223 (TO-261)
CS5201-3GSTR3 FAQ
1.How can I place an order for CS5201-3GSTR3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5201-3GSTR3 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 CS5201-3GSTR3 reliable?
The price and inventory of CS5201-3GSTR3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5201-3GSTR3 is usually 5 days.
3.What payment methods are accepted for CS5201-3GSTR3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5201-3GSTR3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5201-3GSTR3?
CS5201-3GSTR3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5201-3GSTR3 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 CS5201-3GSTR3?
For technical support, including CS5201-3GSTR3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5201-3GSTR3 requirements.
6.How does Aetrix verify that CS5201-3GSTR3 is sourced from the original manufacturer or authorized distributors?
All CS5201-3GSTR3 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 CS5201-3GSTR3 meets industry standards.
7.What is the process for return or replacement of CS5201-3GSTR3?
All CS5201-3GSTR3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5201-3GSTR3, 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 CS5201-3GSTR3 part is unused and in its original packaging.
Return procedure for CS5201-3GSTR3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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