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onsemi CAT6218-320TDGT3
- Part No.:
- CAT6218-320TDGT3
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
CAT6218-320TDGT3.pdf
- Description:
- IC REG LIN 3.2V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,427
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Product details
Overview
CAT6218-320TDGT3 from onsemi is a 300 mA CMOS low-dropout linear regulator with fixed 3.20 V output, 180 mV typical dropout at full load, ±1.0% initial output voltage accuracy, and stable operation with only a 1 µF ceramic output capacitor. It delivers fast transient response in battery-powered portable electronics requiring clean, regulated power from 2.3 V to 5.5 V input sources.
For engineers reviewing the CAT6218-320TDGT3 datasheet, pinout, applications, or equivalent options, key selection considerations include its ultra-low no-load ground current (55 µA typ), quick-start bypass-capacitor interface (10 nF), thermal shutdown (160 °C), fold-back current limiting, and TSOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The CAT6218-320TDGT3 integrates a precision bandgap reference, error amplifier, and PMOS pass transistor in a single-stage LDO architecture optimized for low-noise, low-quiescent-current operation. Its internal UVLO disables output below 2.1 V input, and the 2.5 MΩ EN pull-down ensures safe default-off behavior.
It supports external noise reduction via the BYP pin (10 nF capacitor), achieving 64 dB PSRR at 1 kHz and 54 dB at 20 kHz. The device operates across −40 °C to +125 °C junction temperature with thermal hysteresis of 10 °C and features an integrated 250 Ω output discharge switch during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.20 V ±1.0% initial accuracy - ensures precise rail generation for 3.3 V–tolerant logic without external feedback. |
| Max Output Current | 300 mA guaranteed - supports moderate-power microcontrollers, sensors, and RF front-ends without thermal derating under typical conditions. |
| Dropout Voltage | 180 mV typical at 300 mA - enables regulation from 3.38 V input, preserving headroom in single-cell Li-ion or dual-cell alkaline systems. |
| Ground Current | 55 µA typical at no load - minimizes standby power loss in always-on subsystems like real-time clocks or wake-up controllers. |
| PSRR | 64 dB at 1 kHz (with 10 nF BYP cap) - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Enable Threshold | VEN(HI) = 1.6 V min over temp - compatible with 1.8 V GPIOs and open-drain logic without level-shifting. |
| Thermal Shutdown | 160 °C with 10 °C hysteresis - prevents permanent damage during sustained overload or poor heatsinking in compact enclosures. |
Pinout & Package
The CAT6218-320TDGT3 is housed in a RoHS-compliant, lead-free TSOT-23-5 package (Case 419AE), measuring 2.90 mm × 1.60 mm × 1.00 mm max height, with NiPdAu plating and tape-and-reel packaging (3,000 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.3–5.5 V; requires local 1 µF ceramic bypass to GND for stability and EMI suppression. |
| GND | Power ground reference | Must connect directly to low-impedance PCB ground plane to maintain regulation accuracy and thermal performance. |
| EN | Active-high enable control | Pulled down internally by 2.5 MΩ; drives high (>1.6 V) to activate regulator; open-circuit defaults to OFF state. |
| BYP | Reference bypass node | Connects optional 10 nF capacitor to GND to reduce output noise and improve high-frequency PSRR. |
| VOUT | Regulated output terminal | Delivers stable 3.20 V; requires 1 µF ceramic output capacitor (5–500 mΩ ESR) placed adjacent to pin for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Quick-start bypass interface | Enables 10 nF BYP capacitor to cut output noise to 45 µVRMS (10 Hz–100 kHz) without increasing turn-on time (150 µs). |
| Fold-back current limit | Reduces short-circuit current to ~180 mA, lowering power dissipation and enabling safe recovery after fault clearance. |
| Zero shutdown current | Draws ≤1 µA when EN < 0.4 V - eliminates battery drain in powered-off modes of portable medical or IoT edge devices. |
| Stable with minimal capacitance | Guarantees stability using only 1 µF ceramic COUT, reducing BOM cost and board area vs. traditional LDOs needing ≥10 µF. |
| Integrated output discharge | 250 Ω internal switch actively discharges VOUT during shutdown, preventing floating outputs that could disrupt downstream logic sequencing. |
Applications
| Wearable Health Monitors | Smart Sensor Nodes |
|---|---|
|
Use Scenario: Continuous ECG/PPG signal acquisition in coin-cell–powered wrist-worn devices. IC Role / Device Role / Timing Role: Primary 3.20 V supply for analog front-end (AFE) and ultra-low-power MCU. Use Value: 55 µA no-load ground current extends battery life beyond 6 months; 45 µVRMS output noise preserves SNR in sub-µV biomedical measurements. |
Use Scenario: Battery-operated environmental sensor clusters transmitting via BLE or LoRaWAN. IC Role / Device Role / Timing Role: Clean, low-noise power source for precision ADCs, MEMS accelerometers, and RF transceivers. Use Value: 64 dB PSRR at 1 kHz rejects switching noise from shared DC-DC converter; 150 µs turn-on enables rapid wake-from-sleep operation. |
| Industrial Handheld Terminals | USB-Powered Peripherals |
|
Use Scenario: Ruggedized barcode scanners and data collectors using Li-ion batteries with wide input voltage swing. IC Role / Device Role / Timing Role: Post-regulator for 3.3 V I/O rails, decoupling noisy system power domains. Use Value: 180 mV dropout allows full 3.20 V output even as battery discharges to 3.38 V; thermal shutdown protects against enclosure overheating. |
Use Scenario: USB-C powered audio DACs, USB-to-serial adapters, or HID peripherals drawing <300 mA. IC Role / Device Role / Timing Role: Local LDO generating clean 3.20 V for sensitive analog circuitry from noisy 5 V USB bus. Use Value: 1 µF ceramic stability eliminates need for bulky tantalum capacitors; ±1.0% accuracy meets USB compliance requirements for VBUS-derived rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6218B322MR-G | Same 3.2 V output, 300 mA rating, and TSOT-23-5 package; but 70 µA no-load IQ (vs. 55 µA) and no BYP pin for noise filtering. | Lacks external bypass capability - less suitable for ultra-low-noise AFE designs where CAT6218-320TDGT3's 45 µVRMS noise is critical. | Select CAT6218-320TDGT3 when PSRR enhancement and lowest possible quiescent current are required. |
| Diodes Inc. AP7361-32SG-7 | 3.2 V, 300 mA, SOT-23-5; higher dropout (250 mV @300 mA) and higher ground current (120 µA typ no-load). | Lower efficiency in low-input-voltage scenarios (e.g., <3.45 V); not recommended for Li-ion cells operating near end-of-discharge. | Choose CAT6218-320TDGT3 for tighter dropout and superior light-load efficiency in battery-sensitive designs. |
Compared with XC6218B322MR-G and AP7361-32SG-7, the CAT6218-320TDGT3 offers the lowest combination of dropout voltage, no-load ground current, and output noise - making it optimal for high-precision, battery-constrained applications where power integrity and runtime are co-prioritized.
Availability
CAT6218-320TDGT3 is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, industrial handheld terminals, and USB-powered peripherals requiring stable component supply with guaranteed long-term manufacturability.
Supply support for CAT6218-320TDGT3 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The CAT6218 series is part of onsemi's precision analog LDO portfolio, engineered specifically for ultra-low-noise, low-quiescent-current power management in portable and battery-critical systems.
FAQ
What is the output voltage tolerance of the CAT6218-320TDGT3 over temperature?
The CAT6218-320TDGT3 maintains ±2.0% output voltage accuracy across the full operating junction temperature range of −40 °C to +125 °C. This specification applies because its nominal output voltage (3.20 V) exceeds 2.0 V, satisfying the condition stated in the datasheet's Electrical Operating Characteristics table for the ±2.0% tolerance band.
Does the CAT6218-320TDGT3 require an external capacitor on the BYP pin?
No - the BYP pin on the CAT6218-320TDGT3 is optional. Connecting a 10 nF capacitor between BYP and GND improves PSRR and reduces output noise to 45 µVRMS, but the device functions fully without it. Omitting the capacitor retains all core regulation functionality while simplifying the BOM.
Can the CAT6218-320TDGT3 operate with a 2.5 V input supply?
Yes - the CAT6218-320TDGT3 supports input voltages from 2.3 V to 5.5 V. With a 2.5 V input and 3.20 V output, the differential is insufficient for regulation; however, the internal UVLO circuit disables the output when VIN falls below ~2.1 V, preventing unstable operation. For reliable 3.20 V output, VIN must be ≥3.38 V (3.20 V + 180 mV dropout).
What is the purpose of the 250 Ω discharge switch in the CAT6218-320TDGT3?
The CAT6218-320TDGT3 integrates a 250 Ω active discharge switch between VOUT and GND that engages during shutdown (when EN is low). This rapidly discharges the output capacitor, preventing residual voltage from holding downstream logic in an undefined state - critical for deterministic power sequencing in multi-rail systems.
Is the CAT6218-320TDGT3 RoHS-compliant and halogen-free?
Yes - the CAT6218-320TDGT3 is RoHS-compliant, lead-free, and halogen-free/BFR-free per onsemi's product marking and packaging documentation. The "G" suffix in TDGT3 denotes NiPdAu lead finish, and all TSOT-23 packages in this family meet JEDEC J-STD-020 moisture sensitivity level 1 requirements.
CAT6218-320TDGT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 75 µA
- Current - Supply (Max):
- 90 µA
- PSRR:
- 64dB ~ 54dB (1kHz ~ 20kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
CAT6218-320TDGT3 FAQ
1.How can I place an order for CAT6218-320TDGT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT6218-320TDGT3 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 CAT6218-320TDGT3 reliable?
The price and inventory of CAT6218-320TDGT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT6218-320TDGT3 is usually 5 days.
3.What payment methods are accepted for CAT6218-320TDGT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT6218-320TDGT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT6218-320TDGT3?
CAT6218-320TDGT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT6218-320TDGT3 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 CAT6218-320TDGT3?
For technical support, including CAT6218-320TDGT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT6218-320TDGT3 requirements.
6.How does Aetrix verify that CAT6218-320TDGT3 is sourced from the original manufacturer or authorized distributors?
All CAT6218-320TDGT3 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 CAT6218-320TDGT3 meets industry standards.
7.What is the process for return or replacement of CAT6218-320TDGT3?
All CAT6218-320TDGT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT6218-320TDGT3, 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 CAT6218-320TDGT3 part is unused and in its original packaging.
Return procedure for CAT6218-320TDGT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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