My Inquiry
My Account
onsemi CAT6218-250TDGT3
- Part No.:
- CAT6218-250TDGT3
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
CAT6218-250TDGT3.pdf
- Description:
- IC REG LIN 2.5V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,404
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CAT6218-250TDGT3 from onsemi is a 300 mA CMOS low-dropout linear regulator with 2.50 V fixed output, 180 mV typical dropout at full load, ±1.0% initial accuracy, and stable operation using only a 1 µF ceramic output capacitor. It delivers fast transient response in battery-powered consumer electronics requiring clean, regulated voltage from 2.3 V to 5.5 V input.
For engineers reviewing the CAT6218-250TDGT3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 300 mA output, zero shutdown current, quick-start bypass capability (10 nF), thermal protection, and TSOT-23-5 package compatibility for space-constrained portable designs.
Technical Context
The CAT6218-250TDGT3 integrates a CMOS pass transistor with internal reference, fold-back current limiting, and thermal shutdown circuitry. Its enable pin features a built-in 2.5 MΩ pull-down resistor, ensuring safe default-off behavior when left floating.
Operation is optimized for low-noise performance via the BYP pin, supporting an external 10 nF capacitor to enhance PSRR-64 dB at 1 kHz and 54 dB at 20 kHz-while maintaining 150 µs turn-on time independent of bypass capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.50 V ±1.0% initial accuracy ensures precise rail generation without external feedback components. |
| Max Output Current | Guaranteed 300 mA continuous output supports microcontroller cores, RF front-ends, and sensor interfaces. |
| Dropout Voltage | 180 mV typical at 300 mA enables regulation from 2.75 V input-critical for single-cell Li-ion or Li-poly systems. |
| Ground Current | 55 µA typical at no load and 80 µA at full 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. |
| Enable Threshold | Logic-high enable threshold of 1.6 V min over temperature ensures reliable activation from GPIOs or PMIC rails. |
| Thermal Shutdown | Triggers at 160 °C with 10 °C hysteresis to prevent permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
The CAT6218-250TDGT3 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, suitable for high-density PCB layouts.
| 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 reduction. |
| 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 | Internal 2.5 MΩ pull-down guarantees disable state if unconnected; compatible with 1.8 V+ logic. |
| BYP | Reference bypass node | Connects to 10 nF capacitor for improved high-frequency PSRR and reduced output noise (45 µVrms). |
| VOUT | Regulated output terminal | Delivers 2.50 V ±1% with <500 mΩ ESR ceramic output capacitor; includes 250 Ω internal discharge switch in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Quick-start bypass architecture | Enables 10 nF BYP capacitor integration without increasing turn-on time-maintains 150 µs startup while cutting noise. |
| Fold-back current limit | Reduces short-circuit current to ~180 mA to limit power dissipation and avoid thermal runaway during fault conditions. |
| Zero shutdown current | Draws ≤1 µA in EN = low state, enabling true "off" mode for ultra-low-power system sleep states. |
| Stable with minimal capacitance | Guarantees stability with only 1 µF ceramic COUT, eliminating need for costly tantalum or large MLCCs. |
| Under-voltage lockout (UVLO) | Disables output below 2.1 V typical VIN, preventing erratic behavior during brown-out or battery depletion. |
Applications
| Smartphone Baseband Power | Wearable Sensor Hub |
|---|---|
|
Use Scenario: Supplying 2.5 V to cellular modem baseband ICs during active data transmission and idle modes. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 2.5 V rail with fast load transient response to handle burst current demands. Use Value: 180 mV dropout allows operation down to 2.75 V input-extending usable battery range in single-cell Li-ion systems. |
Use Scenario: Powering MEMS accelerometers, gyroscopes, and environmental sensors in compact fitness trackers. IC Role / Device Role / Timing Role: Low-quiescent LDO providing stable 2.5 V bias under dynamic load (100 µA–300 mA) with minimal board area. Use Value: 55 µA no-load ground current and TSOT-23-5 footprint reduce standby power and enable sub-10 mm² wearable PCB designs. |
| USB-C Peripheral Audio DAC | IoT Edge Node Microcontroller Core |
|
Use Scenario: Regulating 2.5 V for high-resolution audio DACs in USB-C dongles where host-supplied 5 V is noisy. IC Role / Device Role / Timing Role: Noise-sensitive LDO leveraging BYP pin + 10 nF cap to achieve 45 µVrms output noise and 64 dB PSRR. Use Value: Enables >110 dB SNR in audio paths without requiring additional filtering stages or larger capacitors. |
Use Scenario: Supplying 2.5 V core voltage to ARM Cortex-M4 MCUs in battery-operated industrial gateways. IC Role / Device Role / Timing Role: Enable-controlled LDO supporting deep-sleep wake-up sequences with 150 µs turn-on and zero shutdown leakage. Use Value: Internal EN pull-down eliminates need for external resistor, simplifying BOM and reducing standby current by ≥1 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-2502E/TO | 250 mA max output, 600 mV dropout at full load, no BYP pin, higher ground current (2.5 µA typ no-load). | Lacks quick-start noise suppression; unsuitable for high-PSRR audio or RF biasing. | Choose for cost-sensitive, low-current (<200 mA), non-noise-critical applications where footprint matches. |
| TLS850B2TE/V1 | 500 mA output, integrated watchdog and reset, automotive AEC-Q100 qualified, 300 mV dropout at 500 mA. | Designed for automotive body electronics; includes safety features not needed in consumer portables. | Choose only for automotive-grade designs requiring functional safety compliance-not drop-in for CAT6218-250TDGT3. |
Compared with MCP1700-2502E/TO and TLS850B2TE/V1, the CAT6218-250TDGT3 uniquely balances 300 mA capability, ultra-low dropout (180 mV), and integrated noise-reduction architecture-making it optimal for portable consumer devices demanding both efficiency and signal integrity.
Availability
CAT6218-250TDGT3 is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hubs, USB-C audio peripherals, and IoT edge node microcontroller cores requiring stable component supply with consistent parametric performance across production volumes.
Supply support for CAT6218-250TDGT3 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 edge applications.
The CAT6218 series was designed specifically for battery-powered portable electronics needing high-accuracy, low-noise, low-quiescent LDOs in ultra-small packages-emphasizing fast transient response and robust protection features.
FAQ
What is the maximum input voltage rating for the CAT6218-250TDGT3?
The CAT6218-250TDGT3 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 cause reliability degradation or immediate failure, and operation above 6.5 V violates absolute maximum ratings per the onsemi datasheet.
Does the CAT6218-250TDGT3 require an external capacitor on the BYP pin to function?
No-the BYP pin on the CAT6218-250TDGT3 is optional. The CAT6218-250TDGT3 operates fully functional without any capacitor connected to BYP. Adding a 10 nF capacitor improves PSRR and reduces output noise but does not affect basic regulation or startup timing.
Can the CAT6218-250TDGT3 be used with ceramic output capacitors less than 1 µF?
No-the CAT6218-250TDGT3 is specified and tested for stability only with ≥1 µF ceramic output capacitance. Using smaller values risks oscillation or poor transient response. The datasheet explicitly requires a minimum 1 µF X5R/X7R ceramic capacitor placed close to the VOUT and GND pins.
What happens to the output when the EN pin is left floating on the CAT6218-250TDGT3?
When the EN pin is left floating, the internal 2.5 MΩ pull-down resistor forces the CAT6218-250TDGT3 into shutdown mode-disabling the output and reducing ground current to ≤1 µA. This fail-safe behavior prevents unintended power-up and is confirmed in the device's functional block diagram and pin description.
Is the CAT6218-250TDGT3 pin-compatible with other variants in the CAT6218 family?
Yes-all CAT6218 variants-including CAT6218-250TDGT3-share identical TSOT-23-5 pinout, electrical interface, and package dimensions. Output voltage is factory-set; no external resistors or configuration pins are involved, so swapping voltage versions requires only layout verification-not PCB redesign.
CAT6218-250TDGT3 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):
- 2.5V
- 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
CAT6218-250TDGT3 FAQ
1.How can I place an order for CAT6218-250TDGT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT6218-250TDGT3 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 CAT6218-250TDGT3 reliable?
The price and inventory of CAT6218-250TDGT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT6218-250TDGT3 is usually 5 days.
3.What payment methods are accepted for CAT6218-250TDGT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT6218-250TDGT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT6218-250TDGT3?
CAT6218-250TDGT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT6218-250TDGT3 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 CAT6218-250TDGT3?
For technical support, including CAT6218-250TDGT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT6218-250TDGT3 requirements.
6.How does Aetrix verify that CAT6218-250TDGT3 is sourced from the original manufacturer or authorized distributors?
All CAT6218-250TDGT3 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 CAT6218-250TDGT3 meets industry standards.
7.What is the process for return or replacement of CAT6218-250TDGT3?
All CAT6218-250TDGT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT6218-250TDGT3, 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 CAT6218-250TDGT3 part is unused and in its original packaging.
Return procedure for CAT6218-250TDGT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CAT6218-250TDGT3 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
