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onsemi CS5205-3GT3
- Part No.:
- CS5205-3GT3
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
CS5205-3GT3.pdf
- Description:
- IC REG LINEAR 3.3V 5A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,096
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Product details
Overview
CS5205-3GT3 from onsemi is a 5.0 A fixed-output linear regulator delivering 3.3 V with ±2.0% accuracy, 1.2 V dropout at full load, thermal shutdown, overcurrent protection, and SOA limiting - designed for microprocessor post-regulation and low-voltage embedded power rails.
For engineers reviewing the CS5205-3GT3 datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, TO-220-3 package details, thermal design guidance, and validated alternative options for high-current 3.3 V supply designs.
Technical Context
The CS5205-3GT3 integrates a composite PNP-NPN output stage optimized for low-dropout operation at 5.0 A, with internal bandgap reference and error amplifier enabling stable regulation under fast load transients. Its protection architecture includes thermal shutdown (150–180°C), current limit (5.5–8.5 A), and Safe Operating Area (SOA) circuitry that dynamically reduces available output current as VIN–VOUT increases.
It operates with input voltages up to 17 V and requires external tantalum output capacitance (≥22 µF) for stability due to ESR-dependent loop compensation. The device's quiescent current remains ≤10 mA at full load, supporting efficient operation in thermally constrained environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2.0% - ensures reliable core logic supply within FPGA/microprocessor tolerance bands. |
| Max Output Current | 5.0 A continuous - supports high-power SoC and ASIC core rail requirements without derating at 70°C ambient. |
| Dropout Voltage | 1.2 V (typ) @ 5.0 A - enables operation from 4.5 V input to sustain 3.3 V output in battery-backed or low-headroom systems. |
| Thermal Shutdown | 150°C activation with 25°C hysteresis - prevents permanent damage during sustained overload or inadequate heatsinking. |
| Ripple Rejection | 75 dB @ 120 Hz - suppresses line-frequency noise from upstream switching converters feeding the linear stage. |
| Quiescent Current | 5.0–10 mA @ VIN ≤ 9.0 V, IOUT = 10 mA - minimizes no-load power loss in always-on subsystems. |
| Line Regulation | 0.04% (typ) over 1.5–6.0 V VIN–VOUT range - maintains tight output stability across varying input conditions. |
Pinout & Package
CS5205-3GT3 uses the TO-220-3 (Case 221A) package with tab connected to VOUT for direct heatsink mounting and thermal conduction. Pin 1 is GND, Pin 2 is VOUT (tab), and Pin 3 is VIN - compatible with standard TO-220 footprint layouts and mechanical mounting hardware.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal error amplifier and protection circuitry; must be low-impedance connection to minimize load regulation error. |
| 2 | VOUT | Regulated 3.3 V output; electrically tied to metal tab - requires insulated mounting hardware if heatsink is grounded. |
| 3 | VIN | Unregulated input (up to 17 V); must be decoupled with ≥10 µF capacitor close to pin to suppress high-frequency noise and support transient response. |
Key Features
| Feature | Design Value |
|---|---|
| SOA Protection | Dynamic current limiting scales with VIN–VOUT differential to prevent second breakdown during high-voltage/low-current fault conditions. |
| Fast Transient Response | Stabilized by ≥22 µF tantalum output capacitor; delivers <100 µs recovery from 1–5 A step load with <150 mV dip. |
| Low Quiescent Power | ≤10 mA IQ at full load reduces self-heating and simplifies thermal budgeting in sealed enclosures. |
| Robust Fault Handling | Combines thermal shutdown, cycle-by-cycle current limit, and SOA protection - eliminates need for external crowbar or fuse in most applications. |
| TO-220 Pin Compatibility | Pinout matches LT1084 family - allows drop-in replacement where lower dropout (1.2 V vs. ~1.5 V) improves system efficiency. |
Applications
| Microprocessor Core Supply | FPGA I/O Bank Regulator |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring clean, tightly regulated 3.3 V at up to 4.5 A peak current. IC Role / Device Role / Timing Role: Primary post-regulator following a 5 V or 12 V intermediate bus; provides low-noise, low-ripple DC for digital logic domains. Use Value: 75 dB ripple rejection and <0.4% load regulation ensure clock domain stability and reduce bit error rates in high-speed interfaces. |
Use Scenario: Supplies configurable I/O banks on Xilinx Artix-7 FPGAs where voltage tolerance is ±2% and transient current steps exceed 3 A. IC Role / Device Role / Timing Role: Local point-of-load regulator placed adjacent to FPGA package; handles rapid load changes induced by I/O switching. Use Value: 1.2 V dropout and fast transient response limit output droop to <120 mV during 3 A/µs slew events, preventing I/O timing violations. |
| Industrial PLC Backplane Rail | Medical Imaging Sensor Interface |
|
Use Scenario: Generates isolated 3.3 V rail for analog-to-digital converter (ADC) front-ends and communication ICs in programmable logic controllers. IC Role / Device Role / Timing Role: Secondary regulator fed from 5 V DC-DC converter; supplies mixed-signal subsystems with low thermal drift. Use Value: 0.5% temperature stability and <0.003% RMS noise preserve 16-bit ADC effective resolution across –40°C to +70°C operating range. |
Use Scenario: Powers CMOS image sensor bias circuits and low-noise amplifiers in portable ultrasound probe modules. IC Role / Device Role / Timing Role: Low-noise linear regulator supplying analog signal chain components; rejects switching noise from nearby DC-DC converters. Use Value: 75 dB ripple rejection at 120 Hz and <0.003% RMS output noise prevent spurious artifacts in ultrasound B-mode imaging. |
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-3.3 | Same TO-220-3 pinout, but higher 1.5 V dropout at 5 A and 10 mA quiescent current; no SOA protection. | Lacks dynamic SOA limiting - less robust under high VIN–VOUT fault conditions like input short-circuit. | Select when legacy LT1084 footprint reuse is mandatory and dropout margin >1.5 V is available. |
| TL750L33CKC | Lower 3 A rating, 1.3 V dropout, 15 mA IQ; no thermal hysteresis or SOA circuitry. | Not suitable for sustained 4–5 A loads; limited thermal resilience in enclosed industrial enclosures. | Choose only for cost-sensitive, lower-current (<3 A) applications where thermal headroom exceeds 25°C. |
Compared with LT1084CT-3.3 and TL750L33CKC, the CS5205-3GT3 delivers superior thermal resilience via SOA protection and 0.3 V lower dropout - enabling higher efficiency and safer operation in 5 A microprocessor supply rails where input voltage headroom is constrained.
Availability
CS5205-3GT3 is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O regulation, and industrial PLC backplane rails requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for CS5205-3GT3 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, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The CS5205-3GT3 belongs to onsemi's high-current linear regulator product line, engineered specifically for post-regulation of microprocessor and FPGA power rails where low dropout, fast transient response, and integrated fault protection are critical.
FAQ
What is the maximum input voltage rating for the CS5205-3GT3?
The CS5205-3GT3 has an absolute maximum supply voltage of 17 V. Operation above this level risks permanent damage to the internal PNP-NPN output stage and protection circuitry. For reliable long-term use, design input voltage to remain ≤15 V under worst-case transient conditions, as specified in the datasheet's electrical characteristics table.
Does the CS5205-3GT3 require an external output capacitor, and what type is recommended?
Yes, the CS5205-3GT3 requires an external output capacitor for loop stability. A minimum 22 µF tantalum capacitor is recommended - aluminum electrolytic may be used for cost-sensitive designs, but ceramic or film capacitors with near-zero ESR must be avoided as they cause instability. The capacitor must be placed as close as possible to the VOUT and GND pins.
Is the metal tab of the CS5205-3GT3 electrically connected, and how should it be mounted?
Yes, the metal tab of the CS5205-3GT3 is internally connected to the VOUT pin. When mounting to a heatsink, electrical isolation is required unless the heatsink is referenced to the 3.3 V output rail. Use insulating shoulder washers and thermal compound to maintain both thermal performance and electrical safety.
How does the SOA protection in the CS5205-3GT3 differ from standard current limiting?
The SOA protection in the CS5205-3GT3 dynamically reduces the maximum allowable output current as the VIN–VOUT differential increases - unlike fixed current limit, this prevents second breakdown in the output transistor during high-voltage/low-current fault conditions. This behavior is confirmed in the datasheet's Applications Information section and protects against damage during input overvoltage or output short-circuit events.
Can the CS5205-3GT3 be used in place of the CS5205-1GT3 without circuit modifications?
No - the CS5205-3GT3 is a fixed 3.3 V regulator with GND on Pin 1, while the CS5205-1GT3 is adjustable with Adj on Pin 1. Swapping them requires rewiring the feedback network and verifying load regulation performance, as the pinout differs between versions. The CS5205-3GT3 is not a drop-in replacement for the CS5205-1GT3.
CS5205-3GT3 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):
- 17V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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
CS5205-3GT3 FAQ
1.How can I place an order for CS5205-3GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS5205-3GT3 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 CS5205-3GT3 reliable?
The price and inventory of CS5205-3GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS5205-3GT3 is usually 5 days.
3.What payment methods are accepted for CS5205-3GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS5205-3GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS5205-3GT3?
CS5205-3GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS5205-3GT3 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 CS5205-3GT3?
For technical support, including CS5205-3GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS5205-3GT3 requirements.
6.How does Aetrix verify that CS5205-3GT3 is sourced from the original manufacturer or authorized distributors?
All CS5205-3GT3 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 CS5205-3GT3 meets industry standards.
7.What is the process for return or replacement of CS5205-3GT3?
All CS5205-3GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CS5205-3GT3, 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 CS5205-3GT3 part is unused and in its original packaging.
Return procedure for CS5205-3GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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