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onsemi LP2950ACDT-3RKG
- Part No.:
- LP2950ACDT-3RKG
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LP2950ACDT-3RKG.pdf
- Description:
- IC REG LINEAR 3V 100MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,247
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Product details
Overview
LP2950ACDT-3RKG from onsemi is a 3.3 V, ±0.5% initial tolerance, low-dropout linear voltage regulator in DPAK (TO-252) package, delivering up to 100 mA output current with 380 mV dropout at full load and 75 µA quiescent current - designed for battery-powered instrumentation requiring stable 3.3 V rail under varying input conditions.
For engineers reviewing the LP2950ACDT-3RKG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 100 mA, ±0.5% output accuracy over −40°C to +125°C, thermal resistance (RJA = 92°C/W), stability with 1.0 µF ceramic output capacitor, and compatibility with unregulated inputs up to 30 V.
Technical Context
The LP2950ACDT-3RKG uses a PNP pass transistor architecture enabling ultra-low dropout and micropower operation. Its internal bandgap reference and error amplifier maintain regulation with only 380 mV headroom at 100 mA, while built-in thermal shutdown and current limiting ensure robustness during fault conditions.
No external feedback network is required - the 3.3 V output is fixed via internal resistor divider. Unlike the LP2951, it lacks error flag, shutdown, or adjustable output features, making it a dedicated, minimal-footprint LDO for cost- and space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±0.5% at TA = 25°C; ±0.6% over −40°C to +125°C - enables direct replacement of 3.3 V logic rails without calibration. |
| Max Output Current | 100 mA - sufficient for microcontrollers, sensors, and interface ICs in portable systems. |
| Dropout Voltage | 380 mV at 100 mA - allows operation from single Li-ion (3.0–4.2 V) or 5 V rail with ≥1.2 V margin. |
| Quiescent Current | 75 µA - extends battery life in always-on monitoring circuits (e.g., IoT edge nodes). |
| Input Voltage Range | 2.5 V to 30 V - accommodates wide-input industrial supplies and automotive transients (with external protection). |
| Thermal Resistance | RJA = 92°C/W (DPAK on 1 in² 2 oz copper) - supports 0.5 W continuous dissipation at +70°C ambient. |
| Stability Requirement | 1.0 µF ceramic output capacitor - eliminates need for tantalum; compatible with low-ESR MLCCs. |
Pinout & Package
DPAK (TO-252) package with exposed thermal pad connected to Pin 2 (GND); heatsink surface electrically tied to ground for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input; must be ≥3.68 V to sustain 3.3 V output at 100 mA. |
| 2 | Ground | Power and signal reference; also connects to exposed thermal pad for PCB heat sinking. |
| 3 | Output | Regulated 3.3 V supply; requires ≥1.0 µF ceramic capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout at full load | 380 mV @ 100 mA enables use with <4.0 V sources (e.g., discharged Li-ion cells). |
| High output accuracy | ±0.5% initial tolerance reduces need for post-production trimming in precision analog systems. |
| Micropower operation | 75 µA quiescent current allows >1-year runtime on coin-cell batteries in sleep-mode applications. |
| Integrated protection | Internal current limit (~250 mA) and thermal shutdown prevent damage during short-circuit or overload. |
| Wide temperature range | Specified from −40°C to +125°C - suitable for under-hood automotive and industrial control environments. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data via BLE every 5 seconds. IC Role / Device Role / Timing Role: Primary 3.3 V power rail for MCU, RF transceiver, and analog front-end. Use Value: 75 µA quiescent current extends CR2032 battery life beyond 2 years; 380 mV dropout maintains regulation down to 3.68 V input. | Use Scenario: Handheld pulse oximeter operating from two AAA alkaline cells (2.0–3.2 V). IC Role / Device Role / Timing Role: Stable 3.3 V supply for optical sensor ADC and display driver. Use Value: Operates continuously from 2.5 V input; ±0.5% output ensures accurate ADC reference scaling across temperature. |
| Automotive Body Control Module | Smart Home Hub Power Rail |
Use Scenario: Low-power wake-up circuit in door module monitoring window switch status. IC Role / Device Role / Timing Role: Always-on 3.3 V rail powering CAN transceiver standby logic and microcontroller RTC. Use Value: Qualified for −40°C to +125°C ambient; withstands 30 V load-dump transients when paired with TVS diode. | Use Scenario: Secondary 3.3 V rail in Wi-Fi/Zigbee hub supplying memory and peripheral interfaces. IC Role / Device Role / Timing Role: Clean, low-noise supply decoupled from noisy 5 V USB input. Use Value: 1.0 µF ceramic stability simplifies layout; 126 µVRMS output noise prevents digital jitter in high-speed serial links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2950CDT-3.3RKG | ±1.0% initial output tolerance vs. ±0.5% for LP2950ACDT-3RKG; otherwise identical electrical specs and DPAK package. | Suitable where tighter regulation is not required (e.g., non-precision digital logic rails). | Select LP2950CDT-3.3RKG for cost-sensitive designs accepting wider output variation. |
| NCP1117DT33RKG | 800 mA output capability, higher 1.2 V dropout at 100 mA, 6 mA quiescent current, TO-252 package. | Better for higher-current loads but consumes more battery power in sleep mode. | Choose NCP1117DT33RKG only if >100 mA load current is needed; avoid for micropower applications. |
Compared with LP2950CDT-3.3RKG, the LP2950ACDT-3RKG offers twice the output accuracy at same cost and footprint; versus NCP1117DT33RKG, it trades current capacity for 80× lower quiescent current - critical for battery longevity in intermittent-use devices.
Availability
LP2950ACDT-3RKG is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive body control modules, and smart home hub power rails requiring stable component supply with guaranteed long-term availability.
Supply support for LP2950ACDT-3RKG 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LP2950 series belongs to onsemi's precision linear regulator product line, engineered specifically for micropower, low-dropout operation in battery- and thermally constrained environments - emphasizing accuracy, reliability, and ease of use without external compensation.
FAQ
What is the maximum input voltage rating for LP2950ACDT-3RKG?
The LP2950ACDT-3RKG has an absolute maximum input voltage of 30 V DC. It can safely operate with transient inputs up to 32 V for durations under 300 ms. For sustained operation, keep input within 2.5 V to 30 V to ensure regulation and avoid exceeding thermal limits - especially critical in DPAK package at high ambient temperatures.
Does LP2950ACDT-3RKG require an external capacitor for stability?
Yes, LP2950ACDT-3RKG requires a minimum 1.0 µF ceramic output capacitor connected between Pin 3 (Output) and Pin 2 (Ground) for guaranteed stability across all load and temperature conditions. Aluminum or tantalum capacitors may also be used, but ceramic is preferred for low ESR and compact size. Input bypass capacitance is recommended if wiring exceeds 4 inches.
Is LP2950ACDT-3RKG pin-compatible with LP2951 variants?
No, LP2950ACDT-3RKG is not pin-compatible with any LP2951 variant. The LP2950ACDT-3RKG is a 3-pin DPAK device (Input, Ground, Output), whereas LP2951 parts use 8-pin packages (SOIC-8, Micro8, PDIP-8) with additional pins for shutdown, error flag, sense, and feedback. They serve different design roles - LP2950ACDT-3RKG is a simple fixed-output LDO; LP2951 adds programmability and monitoring.
What is the thermal performance of LP2950ACDT-3RKG in typical PCB layouts?
With standard PCB layout (1 in² of 2 oz copper connected to the DPAK thermal pad), LP2950ACDT-3RKG achieves RJA = 92°C/W. At 100 mA output and 30 V input, power dissipation is ~2.7 W - resulting in ~250°C junction rise above ambient, exceeding safe limits. Real-world use requires ≤12 V input or reduced load; derating curves in Figure 29 show safe operating area based on copper area and airflow.
Can LP2950ACDT-3RKG be used in automotive applications?
The LP2950ACDT-3RKG is not AEC-Q100 qualified and lacks automotive-specific screening or PPAP documentation. For automotive use, select the NCV2951ACDR2G (SOIC-8) or NCV2951ACDMR2G (Micro8), which are explicitly qualified for automotive applications. LP2950ACDT-3RKG may be used in non-safety-critical aftermarket accessories, but not in OEM vehicle ECUs without additional qualification.
LP2950ACDT-3RKG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.45V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 120 µA
- Current - Supply (Max):
- 12 mA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LP2950ACDT-3RKG FAQ
1.How can I place an order for LP2950ACDT-3RKG through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2950ACDT-3RKG 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 LP2950ACDT-3RKG reliable?
The price and inventory of LP2950ACDT-3RKG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2950ACDT-3RKG is usually 5 days.
3.What payment methods are accepted for LP2950ACDT-3RKG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2950ACDT-3RKG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2950ACDT-3RKG?
LP2950ACDT-3RKG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2950ACDT-3RKG 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 LP2950ACDT-3RKG?
For technical support, including LP2950ACDT-3RKG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2950ACDT-3RKG requirements.
6.How does Aetrix verify that LP2950ACDT-3RKG is sourced from the original manufacturer or authorized distributors?
All LP2950ACDT-3RKG 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 LP2950ACDT-3RKG meets industry standards.
7.What is the process for return or replacement of LP2950ACDT-3RKG?
All LP2950ACDT-3RKG units undergo pre-shipment inspection (PSI). If there is an issue with LP2950ACDT-3RKG, 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 LP2950ACDT-3RKG part is unused and in its original packaging.
Return procedure for LP2950ACDT-3RKG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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