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onsemi CAT6218-180TDGT3
- Part No.:
- CAT6218-180TDGT3
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
CAT6218-180TDGT3.pdf
- Description:
- IC REG LIN 1.8V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,118
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Product details
Overview
CAT6218-180TDGT3 from onsemi is a 300 mA CMOS low-dropout linear regulator with 1.80 V fixed 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 serves as a precision power supply for noise-sensitive core logic in portable electronics.
For engineers reviewing the CAT6218-180TDGT3 datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low ground current (55 µA no-load), quick-start capability with external 10 nF bypass capacitor, zero shutdown current, thermal protection, and TSOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The CAT6218-180TDGT3 employs a CMOS pass transistor architecture enabling low dropout and minimal ground current across load conditions. Its internal reference bypass pin (BYP) supports optional 10 nF capacitor connection to suppress high-frequency output noise and improve PSRR-64 dB at 1 kHz and 54 dB at 20 kHz when BYP is used.
Enable logic is active-high with integrated 2.5 MΩ pull-down resistor, ensuring safe default-off behavior. Under-voltage lockout disables regulation below 2.1 V typical input, while fold-back current limiting and thermal shutdown at 160 °C protect against fault conditions without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.80 V ±1.0% initial accuracy - ensures stable core voltage for 1.8 V I/O or logic rails without external feedback. |
| Max Output Current | Guaranteed 300 mA - sufficient to power microcontroller cores, RF transceivers, or sensor signal chains. |
| Dropout Voltage | 180 mV typical at 300 mA - enables regulation from 2.3 V input down to 1.8 V output, extending battery runtime. |
| Ground Current | 55 µA typical at no load - minimizes quiescent power loss in always-on subsystems. |
| PSRR | 64 dB at 1 kHz (with 10 nF BYP cap) - suppresses switching noise from upstream DC-DC converters feeding VIN. |
| Enable Threshold | VEN(HI) = 1.6 V min over temp - compatible with 1.8 V GPIO without level-shifting. |
| Thermal Shutdown | 160 °C with 10 °C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
The CAT6218-180TDGT3 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, optimized for high-density portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 2.3 V to 5.5 V; requires local 1 µF ceramic bypass capacitor to GND for stability and EMI filtering. |
| GND | Power ground reference | Must connect directly to low-impedance PCB ground plane; shared return path for all internal circuits. |
| EN | Active-high enable control | Pulled down internally (2.5 MΩ); drives high ≥1.6 V to activate regulator; open-circuit defaults to OFF. |
| BYP | Reference bypass node | Connects optional 10 nF capacitor to GND to reduce output noise and boost PSRR above 10 kHz. |
| VOUT | Regulated output | Delivers 1.80 V ±1.0%; requires 1 µF ceramic capacitor (5–500 mΩ ESR) placed adjacent to pin for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Quick-start with BYP capacitor | Enables 150 µs turn-on time while reducing broadband output noise to 45 µVRMS (10 Hz–100 kHz). |
| Ultra-low shutdown current | 1 µA max shutdown ground current - eliminates battery drain in powered-off states. |
| Stable with minimal capacitance | Guaranteed stability using only 1 µF ceramic COUT, reducing BOM count and board area vs. larger electrolytics. |
| Fold-back current limit | Reduces short-circuit current to ~180 mA, lowering power dissipation and thermal stress during faults. |
| Integrated UVLO | Disables output below 2.1 V input, preventing erratic behavior during brown-out or battery depletion. |
Applications
| Smartphone Application Processor Core | Wearable Sensor Hub Power |
|---|---|
|
Use Scenario: Supplying 1.8 V core voltage to ARM Cortex-M or RISC-V MCU in battery-powered smartphones. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise bias to digital logic blocks requiring tight voltage tolerance and fast transient response. Use Value: 1.0% initial accuracy and 180 mV dropout preserve battery life while maintaining functional safety margins under dynamic load steps up to 300 mA. |
Use Scenario: Powering MEMS accelerometers, gyroscopes, and BLE radio subsystems in compact wearables. IC Role / Device Role / Timing Role: Low-quiescent LDO providing regulated 1.8 V rail isolated from noisy system supplies via high PSRR and BYP filtering. Use Value: 55 µA no-load ground current extends multi-week battery life; 150 µs turn-on enables rapid wake-from-sleep sequencing. |
| Industrial IoT Edge Node MCU | Portable Medical Diagnostic Sensor |
|
Use Scenario: Delivering stable 1.8 V to ultra-low-power microcontrollers (e.g., STM32L4, nRF52) in remote environmental monitors. IC Role / Device Role / Timing Role: Always-on LDO supporting real-time clock and sensor interface logic during deep-sleep modes. Use Value: Zero shutdown current and thermal protection ensure reliability across −40°C to +125°C ambient without derating. |
Use Scenario: Biasing analog front-end (AFE) and ADC reference circuits in handheld ECG or pulse oximetry devices. IC Role / Device Role / Timing Role: Precision LDO supplying low-noise 1.8 V reference rail critical for <12-bit measurement accuracy. Use Value: 45 µVRMS output noise and 64 dB PSRR minimize quantization error introduced by supply ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-1802E/TO | 250 mA rated, 600 mV dropout at full load, no BYP pin, 2 µA quiescent current. | Lacks noise-reduction capability and thermal fold-back; suited for lower-current, cost-sensitive designs. | Choose if output current ≤250 mA and PSRR/noise performance is secondary to ultra-low IQ. |
| Torex XC6206P182MR-G | 300 mA rated, 350 mV dropout at full load, no EN pin, 1.0% accuracy, SOT-23-3 package. | Fixed ON state only; no enable control or BYP option; smaller footprint but less design flexibility. | Choose if board space is critical and enable functionality or noise filtering is unnecessary. |
Compared with MCP1700-1802E/TO and XC6206P182MR-G, the CAT6218-180TDGT3 uniquely combines 300 mA capability, 180 mV dropout, BYP-enabled noise suppression, and active enable-all in a 5-pin TSOT-23, making it optimal for high-performance portable systems demanding both efficiency and signal integrity.
Availability
CAT6218-180TDGT3 is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, and industrial IoT edge nodes requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for CAT6218-180TDGT3 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 intelligent power solutions.
The CAT6218 series is part of onsemi's precision analog portfolio, engineered specifically for battery-powered portable electronics requiring ultra-low IQ, fast transient response, and robust fault protection in miniature packages.
FAQ
What is the maximum input voltage rating for the CAT6218-180TDGT3?
The CAT6218-180TDGT3 has an absolute maximum input voltage rating of 6.5 V. However, its recommended operating input range is 2.3 V to 5.5 V. Exceeding 5.5 V may compromise reliability or trigger overvoltage stress not covered by specification guarantees. The CAT6218-180TDGT3 must be operated within this recommended range for guaranteed performance and lifetime.
Does the CAT6218-180TDGT3 require an external bypass capacitor to function?
No-the CAT6218-180TDGT3 operates fully functional without the BYP capacitor. The 10 nF capacitor on the BYP pin is optional and used solely to reduce output noise and improve PSRR above 10 kHz. The CAT6218-180TDGT3 delivers its specified 1.80 V output, stability, and transient response with only the required 1 µF output capacitor and 1 µF input capacitor.
What is the purpose of the EN pin on the CAT6218-180TDGT3, and what logic levels activate it?
The EN pin on the CAT6218-180TDGT3 is an active-high enable input with an internal 2.5 MΩ pull-down resistor. It activates regulation when driven to ≥1.6 V (minimum over temperature) and disables output when ≤0.4 V. An unconnected EN pin defaults to OFF due to the pull-down, making the CAT6218-180TDGT3 inherently fail-safe in open-circuit conditions.
Can the CAT6218-180TDGT3 safely drive a 300 mA load continuously?
Yes-the CAT6218-180TDGT3 is guaranteed to deliver 300 mA continuously under proper thermal conditions. However, continuous 300 mA operation with >1 V input-to-output differential may trigger thermal shutdown depending on PCB layout and ambient temperature. Derating is advised above 250 mA when VIN exceeds VOUT by >1 V; the CAT6218-180TDGT3 includes thermal protection to prevent damage during such conditions.
Is the CAT6218-180TDGT3 RoHS-compliant and lead-free?
Yes-the CAT6218-180TDGT3 is RoHS-compliant, lead-free, halogen-free, and BFR-free, with NiPdAu lead finish. This compliance is confirmed in the official onsemi datasheet (CAT6218/D, Rev. 5, September 2019) and applies to the TD package variant shipped in tape-and-reel format (T3). The CAT6218-180TDGT3 meets global environmental regulations for commercial and industrial electronics manufacturing.
CAT6218-180TDGT3 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):
- 1.8V
- 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
CAT6218-180TDGT3 FAQ
1.How can I place an order for CAT6218-180TDGT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT6218-180TDGT3 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 CAT6218-180TDGT3 reliable?
The price and inventory of CAT6218-180TDGT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT6218-180TDGT3 is usually 5 days.
3.What payment methods are accepted for CAT6218-180TDGT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT6218-180TDGT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT6218-180TDGT3?
CAT6218-180TDGT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT6218-180TDGT3 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 CAT6218-180TDGT3?
For technical support, including CAT6218-180TDGT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT6218-180TDGT3 requirements.
6.How does Aetrix verify that CAT6218-180TDGT3 is sourced from the original manufacturer or authorized distributors?
All CAT6218-180TDGT3 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 CAT6218-180TDGT3 meets industry standards.
7.What is the process for return or replacement of CAT6218-180TDGT3?
All CAT6218-180TDGT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT6218-180TDGT3, 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 CAT6218-180TDGT3 part is unused and in its original packaging.
Return procedure for CAT6218-180TDGT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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