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onsemi CS5201-1GST3
- Part No.:
- CS5201-1GST3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
CS5201-1GST3.pdf
- Description:
- IC REG LINEAR ADJ LDO REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,455
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Product details
Overview
CS5201-1GST3 from onsemi is a 1.0 A adjustable linear regulator with ±1.0% output voltage accuracy over temperature, 1.25 V to 5.5 V programmable output range using two external resistors, and 1.0 V typical dropout at full load. It serves as a post-regulator or microprocessor supply in low-voltage, high-transient-response applications.
For engineers reviewing the CS5201-1GST3 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1.0 A, thermal shutdown threshold (150–210°C), load regulation (0.40% max), ripple rejection (80 dB at 120 Hz), and SOT-223 package compatibility with board space-constrained designs.
Technical Context
The CS5201-1GST3 employs a composite PNP-NPN pass transistor architecture optimized for low dropout and fast transient response. Its internal bandgap reference (1.254 V typical) and error amplifier enable precise adjustable output regulation while maintaining stability with ≥22 µF tantalum output capacitance.
Protection circuitry includes current limiting (1.1–3.1 A) and thermal shutdown with 25°C hysteresis. The device operates within −40°C to +70°C ambient, supports input voltages up to 7.0 V, and requires no minimum load beyond 0.6 mA under specified conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.0 A continuous - supports microprocessor core rails and FPGA I/O banks requiring stable high-current bias. |
| Output Voltage Range | 1.25 V to 5.5 V - set via external R1/R2 divider; enables flexible system-level voltage scaling without changing IC. |
| Dropout Voltage | 1.0 V typical @ 1.0 A - allows operation with minimal VIN–VOUT margin, critical for battery-powered or low-headroom DC/DC cascaded systems. |
| Output Accuracy | ±1.0% over temperature - ensures tight regulation across industrial ambient range, reducing need for downstream voltage trimming. |
| Ripple Rejection | 80 dB @ 120 Hz - suppresses switching noise from upstream DC/DC converters, improving analog subsystem SNR. |
| Thermal Shutdown | 150–210°C activation - protects against sustained overload or inadequate heatsinking in enclosed enclosures. |
| Adjust Pin Current | 50 µA typical - introduces predictable error in R2-based feedback; must be factored into precision VOUT design. |
Pinout & Package
SOT-223 package (Case 318E), surface-mount, thermally enhanced with exposed tab connected to VOUT. Pin 1 = Adj (low-side reference node), Pin 2 = VOUT (regulated output and case connection), Pin 3 = VIN (input supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj) | Reference adjust node | Connects to junction of R1/R2 divider; sets output via 1.25 V internal reference; 50 µA bias current flows here. |
| 2 (VOUT) | Regulated output / thermal tab | Delivers regulated voltage; case is electrically tied to VOUT - requires isolation if mounting to heatsink at different potential. |
| 3 (VIN) | Input supply | Accepts up to 7.0 V; differential with VOUT must remain ≤7.0 V to avoid overstress during short-circuit or power-up transients. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Stabilizes within microseconds after load step - maintains microprocessor supply integrity during burst-mode execution. |
| Low dropout voltage | 1.0 V @ 1.0 A - enables use with 3.3 V input to generate 2.5 V or 1.8 V rails where PMICs are unavailable or cost-prohibitive. |
| Integrated protection | Current limit + thermal shutdown - eliminates need for external foldback or thermal sensors in space-constrained embedded modules. |
| Stability with standard capacitors | Compatible with 22 µF tantalum output cap - avoids costly low-ESR ceramic networks required by some LDOs. |
| Pb-free SOT-223 option | CS5201-1GSTR3G variant available - meets RoHS compliance without derating or layout change. |
Applications
| Microprocessor Core Supply | FPGA I/O Bank Regulation |
|---|---|
Use Scenario: Powering ARM Cortex-A series CPU cores requiring tightly regulated 1.2 V @ 1.0 A with fast load-step recovery. IC Role / Device Role / Timing Role: Primary post-regulator delivering final core voltage after buck converter; handles dynamic current spikes during instruction fetch bursts. Use Value: 1.0 V dropout enables 2.2 V input from intermediate rail, minimizing conduction loss; ±1.0% accuracy prevents timing margin violation at maximum frequency. | Use Scenario: Generating configurable 1.8 V, 2.5 V, or 3.3 V for FPGA I/O banks interfacing with mixed-voltage peripherals. IC Role / Device Role / Timing Role: Adjustable voltage source enabling single-BOM support across multiple interface standards (LVCMOS, SSTL, HSTL). Use Value: External resistor programming allows field reconfiguration without PCB redesign; 80 dB ripple rejection preserves signal integrity on high-speed parallel buses. |
| Industrial Sensor Signal Chain | Medical Portable Device Bias Rail |
Use Scenario: Providing clean 3.3 V bias to precision ADCs, op-amps, and MEMS sensor interfaces in factory automation nodes. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy digital domains; referenced to system ground via Kelvin sense point. Use Value: 0.04% typical load regulation minimizes gain error drift across sensor load variations; thermal shutdown prevents fault propagation in sealed enclosures. | Use Scenario: Delivering 5.0 V @ 1.0 A to portable ultrasound front-end ASICs operating from Li-ion battery packs (3.0–4.2 V nominal). IC Role / Device Role / Timing Role: Linear post-regulator ensuring EMI-free bias for RF receive chains and time-of-flight measurement circuits. Use Value: Fast transient response maintains voltage during pulsed transmit/receive cycles; SOT-223 footprint fits compact handheld form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1086CT-1.2#PBF | Pin-compatible but higher dropout (1.3 V typ @ 1.5 A); ±1.5% initial accuracy; TO-220 only. | Requires larger heatsink due to higher thermal resistance; not offered in SOT-223. | Select when legacy LT1086 footprint reuse is mandatory and 0.3 V extra dropout is acceptable. |
| TLV1117-33CDCYR | Fixed 3.3 V output; 800 mA max; 1.2 V dropout; SOT-223 package; ±2% accuracy. | Lacks adjustability; lower current rating limits use to non-core logic rails. | Choose for cost-sensitive, fixed-voltage applications where 1.0 A and ±1.0% are not required. |
Compared with LT1086CT-1.2#PBF and TLV1117-33CDCYR, the CS5201-1GST3 uniquely combines SOT-223 packaging, 1.0 A capability, ±1.0% accuracy, and 1.25–5.5 V adjustability - making it optimal for next-gen compact, multi-rail embedded systems needing design flexibility without performance compromise.
Availability
CS5201-1GST3 is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O regulation, industrial sensor biasing, and portable medical device power rails requiring stable component supply across production lifecycles.
Supply support for CS5201-1GST3 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 electronics, delivering silicon solutions for automotive, industrial, cloud, and medical applications.
The CS5201-1GST3 belongs to onsemi's linear regulator product line, engineered for high-current, low-dropout post-regulation in space-constrained embedded systems where precision, reliability, and thermal robustness are critical.
FAQ
What is the maximum input voltage for the CS5201-1GST3?
The CS5201-1GST3 has an absolute maximum supply voltage (VIN) of 7.0 V. This rating applies to the differential between VIN and VOUT - meaning VIN must not exceed VOUT by more than 7.0 V at any time, including during startup or short-circuit events. Exceeding this limit risks permanent damage even if thermal shutdown activates.
Does the CS5201-1GST3 require an external capacitor on the Adjust pin?
Yes, the CS5201-1GST3 benefits from a 0.1 µF tantalum capacitor between the Adjust pin and ground. This capacitor improves ripple rejection and transient response, especially in noise-sensitive applications like ADC biasing. While not strictly mandatory for basic regulation, omitting it may degrade AC performance metrics documented in the datasheet, such as 80 dB ripple rejection at 120 Hz.
Can the CS5201-1GST3 be used without a heatsink in SOT-223 package?
The CS5201-1GST3 in SOT-223 has a typical RJA of 156°C/W. At 1.0 A output with 2.0 V dropout (2.0 W dissipation), junction temperature rise would exceed 312°C - far above the 150°C absolute maximum. Therefore, a heatsink or copper pour is mandatory for continuous 1.0 A operation. Derating to ≤500 mA without heatsink may be feasible depending on ambient and PCB copper area.
How does the CS5201-1GST3 handle short-circuit conditions?
The CS5201-1GST3 provides current limiting (1.1–3.1 A) and thermal shutdown (150–210°C), but these protections do not guarantee safe operation during sustained short circuits at high VIN–VOUT differentials. If VIN exceeds VOUT by >7.0 V during a short, the pass transistor can fail before protection circuits respond. External clamping (e.g., Zener diode) is recommended for fail-safe high-voltage applications.
Is the CS5201-1GST3 pin-compatible with other regulators besides the LT1086 family?
The CS5201-1GST3 is explicitly documented as pin-compatible with the LT1086 family in TO-220 and D2PAK packages. However, the SOT-223 variant (CS5201-1GST3) has identical pinout (Adj-VOUT-VIN) to industry-standard adjustable regulators in that package, including the LM1117-ADJ and TLV1117-ADJ. Mechanical fit is confirmed, but electrical parameters (dropout, accuracy, thermal behavior) differ - validation is required before substitution.
CS5201-1GST3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 1V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223 (TO-261)
CS5201-1GST3 FAQ
1.How can I place an order for CS5201-1GST3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5201-1GST3 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 CS5201-1GST3 reliable?
The price and inventory of CS5201-1GST3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5201-1GST3 is usually 5 days.
3.What payment methods are accepted for CS5201-1GST3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5201-1GST3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5201-1GST3?
CS5201-1GST3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5201-1GST3 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 CS5201-1GST3?
For technical support, including CS5201-1GST3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5201-1GST3 requirements.
6.How does Aetrix verify that CS5201-1GST3 is sourced from the original manufacturer or authorized distributors?
All CS5201-1GST3 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 CS5201-1GST3 meets industry standards.
7.What is the process for return or replacement of CS5201-1GST3?
All CS5201-1GST3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5201-1GST3, 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 CS5201-1GST3 part is unused and in its original packaging.
Return procedure for CS5201-1GST3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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