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onsemi CS5205-5GT3
- Part No.:
- CS5205-5GT3
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
CS5205-5GT3.pdf
- Description:
- IC REG LINEAR 5V 5A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,094
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Product details
Overview
CS5205-5GT3 from onsemi is a 5.0 A, fixed 5.0 V linear regulator in TO-220-3 package with ±2.0% output accuracy, 1.2 V dropout at full load, thermal shutdown, overcurrent protection, and safe operating area (SOA) limiting - designed for microprocessor post-regulation and low-voltage, high-transient-demand power rails.
For engineers reviewing the CS5205-5GT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, package mapping, real-world use cases, and validated alternative options for stable high-current analog and digital supply design.
Technical Context
The CS5205-5GT3 implements a composite PNP-NPN pass transistor architecture enabling low-dropout operation down to 1.2 V at 5.0 A while maintaining fast transient response. Its internal bandgap reference and error amplifier regulate output voltage with load regulation of ≤0.40% across 10 mA–5.0 A.
Protection circuitry includes thermal shutdown (150°C trigger, 25°C hysteresis), SOA-limited current foldback that reduces max output current as VIN–VOUT increases, and cycle-by-cycle overcurrent limiting. The device requires a minimum 22 µF tantalum output capacitor for stability and supports Kelvin-sense–optimized layout per datasheet Figure 13.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2.0% - ensures compatibility with 5 V TTL/CMOS logic and legacy peripherals without external feedback components. |
| Max Output Current | 5.0 A continuous - supports high-power FPGA I/O banks, DSP cores, or multi-rail embedded processors without parallel devices. |
| Dropout Voltage | 1.2 V typical at 5.0 A - enables operation from 6.2 V input when delivering full 5.0 V output, minimizing power loss and heat generation. |
| Quiescent Current | 10 mA maximum at full load - reduces no-load power overhead in always-on subsystems such as power management ICs or standby controllers. |
| Ripple Rejection | 75 dB at 120 Hz - suppresses line-frequency noise from upstream switching supplies, critical for ADC reference or analog sensor signal chains. |
| Thermal Shutdown | 150°C junction temperature trigger - prevents catastrophic failure during sustained overload or inadequate heatsinking in enclosed industrial enclosures. |
| Package | TO-220-3 (Case 221A), tab = VOUT - provides mechanical robustness and direct thermal path to heatsink; pin 1 = GND, pin 2 = VOUT, pin 3 = VIN. |
Pinout & Package
TO-220-3 package (Case 221A) with electrically isolated tab connected to VOUT. Mounting screw hole centered on tab; recommended thermal compound interface for heatsink attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal error amplifier and protection comparators; must be routed with low impedance to system ground plane. |
| 2 | VOUT | Regulated 5.0 V output; tab is electrically connected to this pin - requires insulated mounting hardware if heatsink is grounded. |
| 3 | VIN | Unregulated input (≤17 V); must be decoupled with ≥10 µF tantalum capacitor close to pin to ensure stability and transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| SOA Protection | Dynamic current limit scaling with VIN–VOUT differential - prevents thermal runaway during high-input-voltage, low-output-voltage operation (e.g., 12 V → 5 V @ 5 A). |
| Fast Transient Response | Stable under 5 A step load changes with <200 µs recovery - maintains processor core voltage during burst-mode execution without external compensation. |
| Low Dropout | 1.2 V @ 5.0 A - enables higher efficiency than standard 78xx regulators in battery-backed or energy-constrained systems. |
| Thermal Hysteresis | 25°C shutdown hysteresis - avoids oscillatory shutdown/restart cycles during marginal thermal conditions in sealed enclosures. |
| Load Regulation | ≤0.40% from 10 mA to 5.0 A - eliminates need for post-regulator trimming in precision analog subsystems powered from this rail. |
Applications
| Industrial PLC I/O Module | FPGA Configuration Power |
|---|---|
|
Use Scenario: Powers 5 V-tolerant digital I/O buffers, optocoupler drivers, and RS-485 transceivers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary 5 V system rail regulator delivering clean, protected power to field-side interface circuitry. Use Value: SOA protection prevents latch-up during cable short events; 75 dB ripple rejection isolates analog sensor inputs from noisy digital bus noise. |
Use Scenario: Supplies configuration voltage to Xilinx Spartan-7 or Intel Cyclone V FPGA configuration banks during boot and reconfiguration. IC Role / Device Role / Timing Role: Stable 5 V source for FPGA configuration memory and I/O bank initialization sequencing. Use Value: 5.0 A capacity handles peak configuration current surges; fast transient response prevents configuration timeout errors during bitstream loading. |
| Medical Diagnostic Imaging Subsystem | Automotive Infotainment Head Unit |
|
Use Scenario: Provides regulated 5 V to CCD/CMOS image sensor bias circuits and analog front-end amplifiers in portable ultrasound units. IC Role / Device Role / Timing Role: Low-noise analog supply rail with RMS output noise <0.003% VOUT - preserves dynamic range in 12+ bit imaging paths. Use Value: Thermal shutdown and overcurrent protection meet IEC 60601-1 safety requirements for patient-connected equipment power integrity. |
Use Scenario: Delivers 5 V to USB host controllers, display timing controllers, and audio codecs in automotive head units operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-current post-regulator following DC-DC converter, supporting hot-plug USB device insertion transients. Use Value: 1.2 V dropout allows operation from 6.2 V intermediate rail even at cold start; GND pin placement simplifies PCB return path routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1084CT-5#PBF | Pin-compatible but higher 1.5 V dropout at 5 A; ±1.5% output tolerance; no SOA protection. | Lacks dynamic current foldback - less robust under variable VIN–VOUT conditions like automotive load dump. | Select only if lower quiescent current (≈5 mA) is prioritized over thermal margin and transient robustness. |
| LM338K STEEL | Higher 2.0 V dropout at 5 A; ±4% output tolerance; no thermal hysteresis or SOA limiting. | Requires larger heatsink due to higher power dissipation; lacks integrated fault recovery behavior. | Consider only for cost-sensitive, non-critical 5 V rails where thermal derating and protection are managed externally. |
Compared with LT1084CT-5#PBF and LM338K STEEL, the CS5205-5GT3 delivers superior thermal resilience via SOA protection and tighter output accuracy, enabling smaller heatsinks and eliminating external current-sense circuitry in high-reliability embedded systems.
Availability
CS5205-5GT3 is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based accelerators, medical imaging subsystems, automotive infotainment, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for CS5205-5GT3 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 CS5205-5GT3 belongs to onsemi's high-current linear regulator product line, engineered specifically for post-regulation in microprocessor and FPGA power systems where low dropout, fast transient response, and integrated fault protection are mandatory.
FAQ
What is the maximum input voltage rating for the CS5205-5GT3?
The CS5205-5GT3 has an absolute maximum supply voltage of 17 V. Operation above this level risks permanent damage to the internal pass transistor and protection circuitry. For reliable long-term use, the input voltage should remain ≤15 V under all conditions including line transients, as specified in the Electrical Characteristics table on page 2 of the datasheet.
Does the CS5205-5GT3 require an external output capacitor, and what type is recommended?
Yes, the CS5205-5GT3 requires a minimum 22 µF tantalum output capacitor for stability, as confirmed in the Stability Considerations section (page 5). Aluminum electrolytic capacitors are acceptable but exhibit greater ESR variation at low temperatures; ceramic capacitors alone are not recommended due to near-zero ESR causing loop instability. The CS5205-5GT3 datasheet explicitly warns against using film or ceramic-only output networks.
Is the CS5205-5GT3 pin-compatible with other regulators in the same family?
The CS5205-5GT3 shares identical TO-220-3 pinout (GND/VOUT/VIN) with CS5205-1GT3 and CS5205-3GT3, making it mechanically and electrically interchangeable within the CS5205-x series. However, it is not functionally interchangeable with the adjustable CS5205-1GT3 due to internal feedback network differences - substituting CS5205-5GT3 for CS5205-1GT3 will fix output at 5.0 V instead of adjustable voltage.
How does the Safe Operating Area (SOA) protection work in the CS5205-5GT3?
The CS5205-5GT3 implements SOA protection by dynamically reducing the maximum allowable output current as the input-to-output voltage differential increases - preventing thermal runaway during high-VIN, low-VOUT operation. This is distinct from simple current limiting and is documented in the Applications Information section (page 5), where SOA behavior is shown to scale current foldback based on (VIN – VOUT) × IOUT product.
Can the CS5205-5GT3 be used without a heatsink?
No - the CS5205-5GT3 cannot operate continuously at 5.0 A without a heatsink. With RJA ≈ 50°C/W (TO-220-3, no heatsink), even at modest 1.2 V dropout (6 W dissipation), junction temperature would exceed 150°C within seconds. The datasheet mandates thermal compound and external heatsinking; thermal resistance junction-to-case (RJC) is 1.6°C/W, requiring RSA ≤ 9.4°C/W for safe 5 A operation at 70°C ambient.
CS5205-5GT3 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):
- 17V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 5A
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (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
CS5205-5GT3 FAQ
1.How can I place an order for CS5205-5GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5205-5GT3 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 CS5205-5GT3 reliable?
The price and inventory of CS5205-5GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5205-5GT3 is usually 5 days.
3.What payment methods are accepted for CS5205-5GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5205-5GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5205-5GT3?
CS5205-5GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5205-5GT3 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 CS5205-5GT3?
For technical support, including CS5205-5GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5205-5GT3 requirements.
6.How does Aetrix verify that CS5205-5GT3 is sourced from the original manufacturer or authorized distributors?
All CS5205-5GT3 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 CS5205-5GT3 meets industry standards.
7.What is the process for return or replacement of CS5205-5GT3?
All CS5205-5GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5205-5GT3, 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 CS5205-5GT3 part is unused and in its original packaging.
Return procedure for CS5205-5GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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