My Inquiry
My Account
onsemi LP2950ACDT-3.3RK
- Part No.:
- LP2950ACDT-3.3RK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LP2950ACDT-3.3RK.pdf
- Description:
- IC REG LINEAR 3.3V 100MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,895
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP2950ACDT-3.3RK 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 industrial sensors and portable instrumentation requiring stable low-power bias.
For engineers reviewing the LP2950ACDT-3.3RK 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 output capacitor, and compatibility with unregulated input sources down to 3.3 V + dropout.
Technical Context
The LP2950ACDT-3.3RK uses a PNP pass transistor architecture enabling ultra-low dropout and micropower operation. Its internal 1.235 V reference and error amplifier deliver tight line regulation (0.04% typ) and load regulation (0.05% typ) across temperature and load.
No external feedback network is required - output is fixed at 3.3 V via internal resistor divider. It integrates thermal shutdown and current limiting, and requires only a single 1.0 µF ceramic or tantalum output capacitor for stability without ESR constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±0.5% at TA = 25°C; ±0.75% over −40°C to +125°C - ensures precision bias for ADC references and MCU cores. |
| Max Output Current | 100 mA - sufficient for powering microcontrollers, sensors, and RF transceivers in space-constrained designs. |
| Dropout Voltage | 380 mV at 100 mA - enables regulation from 3.68 V input, critical for single-cell Li-ion or 4.2 V battery systems. |
| Quiescent Current | 75 µA - extends battery life in always-on monitoring devices operating for years on coin cells. |
| Input Voltage Range | 3.3 V to 30 V - supports wide-input industrial supplies and transient-tolerant operation up to 32 V (300 ms). |
| Thermal Resistance | RJA = 92°C/W (DPAK) - allows >1 W power dissipation with minimal PCB copper, simplifying thermal layout. |
| Stability Capacitor | 1.0 µF ceramic/tantalum - eliminates need for high-ESR capacitors and reduces BOM count vs. legacy LDOs. |
Pinout & Package
DPAK (TO-252) package with exposed heatsink tab electrically connected to Pin 2 (Ground). Compact surface-mount footprint (6.7 mm × 6.2 mm) optimized for thermal performance in high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. Input | Unregulated DC supply input | Accepts 3.3–30 V; must be bypassed with ≥1 µF capacitor near pin for noise immunity. |
| 2. Ground | Power and signal reference | Internally tied to heatsink tab; requires low-impedance PCB ground plane for thermal and noise control. |
| 3. Output | Regulated 3.3 V supply | Delivers up to 100 mA; connects directly to load with 1.0 µF stabilization capacitor to ground. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% initial output tolerance | Eliminates post-production calibration for 3.3 V logic rails and analog sensor excitation. |
| 380 mV dropout @ 100 mA | Enables operation from partially discharged batteries while maintaining regulation through end-of-life. |
| 75 µA quiescent current | Supports >10-year battery life in wireless sensor nodes drawing <1 µA average current. |
| Internal current & thermal protection | Prevents damage during short-circuit or overload - no external foldback circuitry required. |
| Stable with 1.0 µF output capacitor | Reduces solution size and cost vs. LDOs requiring 10–22 µF tantalum or specialized low-ESR ceramics. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Primary 3.3 V supply for MCU, sensor IC, and RF transceiver. Use Value: 380 mV dropout extends usable battery range from 4.2 V to 3.68 V; 75 µA IQ enables multi-year operation on CR2032. | Use Scenario: Handheld pulse oximeter using AAA alkaline cells with auto-shutdown. IC Role / Device Role / Timing Role: Regulated 3.3 V rail for analog front-end (AFE), display driver, and low-power MCU. Use Value: ±0.5% output accuracy ensures consistent LED drive current and ADC reference stability across battery discharge. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Non-safety-critical interior lighting controller in 12 V vehicle system with load dump protection. IC Role / Device Role / Timing Role: Local 3.3 V supply for CAN transceiver and microcontroller I/O. Use Value: 30 V absolute max input withstands ISO 7637-2 pulse 1/2/5a; RJA = 92°C/W sustains operation at 85°C ambient without derating. | Use Scenario: M-Bus enabled electricity meter with optical port and real-time clock. IC Role / Device Role / Timing Role: Precision 3.3 V source for RTC backup and metrology ADC reference. Use Value: Tight load regulation (0.05% typ) prevents measurement drift during varying communication bursts; 1.0 µF stability simplifies conformal coating design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2950CDT-3.3G | Same DPAK package, but ±1.0% initial output tolerance and higher 100 µA quiescent current. | Suitable where cost sensitivity outweighs precision requirements; less suitable for high-accuracy sensor biasing. | Select LP2950CDT-3.3G only if ±1.0% output tolerance and 100 µA IQ meet system specs and reduce BOM cost. |
| TLV70233DBVR | 200 mA output, 250 mV dropout at 200 mA, 30 µA IQ, SOT-23-5 package - smaller footprint but lower thermal mass. | Better for ultra-low-power, space-constrained designs; not drop-in due to different pinout and no thermal tab. | Choose TLV70233DBVR when board area is critical and thermal load <0.5 W; verify stability with 0.1–1 µF capacitor per datasheet. |
Compared with LP2950CDT-3.3G, the LP2950ACDT-3.3RK offers tighter voltage accuracy and lower quiescent current at identical thermal performance; versus TLV70233DBVR, it trades smaller size for superior thermal handling and proven robustness in industrial environments.
Availability
LP2950ACDT-3.3RK is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive body electronics, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for LP2950ACDT-3.3RK 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 was engineered specifically for micropower, low-dropout regulation in battery- and energy-harvesting systems - emphasizing precision, thermal resilience, and minimal external components.
FAQ
What is the maximum input voltage rating for the LP2950ACDT-3.3RK?
The LP2950ACDT-3.3RK has an absolute maximum input voltage of 30 V DC, with a peak transient rating of 32 V for durations under 300 ms. This allows safe operation in 24 V industrial systems and automotive environments with load dump transients, provided external clamping or filtering is used per ISO 7637-2 compliance requirements. Exceeding 32 V may cause permanent damage.
Does the LP2950ACDT-3.3RK require an external capacitor for stability?
Yes - the LP2950ACDT-3.3RK requires a minimum 1.0 µF output capacitor connected between Pin 3 (Output) and Pin 2 (Ground) for guaranteed stability across all loads and temperatures. Aluminum, tantalum, or multilayer ceramic capacitors are acceptable; solid tantalum or X7R/X5R ceramics are recommended for operation below −25°C. No input capacitor is mandatory but advised for >4 inch traces.
What is the thermal resistance (RJA) of the LP2950ACDT-3.3RK in its DPAK package?
The LP2950ACDT-3.3RK in DPAK (Case 369C) has a junction-to-ambient thermal resistance (RJA) of 92°C/W under standard JEDEC test conditions (1-inch² 2-oz copper pad). Actual RJA improves with larger copper areas - e.g., 2-inch² pad reduces RJA to ~65°C/W - enabling continuous 100 mA operation at 85°C ambient without derating when properly laid out.
Can the LP2950ACDT-3.3RK be used in automotive applications?
The LP2950ACDT-3.3RK is not AEC-Q100 qualified. For automotive use, onsemi offers the NCV2951ACDT-3.3RKG - an automotive-grade variant with identical electrical specs, AEC-Q100 qualification, and PPAP capability. The LP2950ACDT-3.3RK is rated for −40°C to +125°C ambient but lacks automotive-specific validation, change control, and site qualification.
How does the dropout voltage of the LP2950ACDT-3.3RK vary with load current?
The dropout voltage of the LP2950ACDT-3.3RK increases with load: 30–80 mV at 100 µA, and 350–450 mV at 100 mA (typical 380 mV). This behavior stems from its PNP pass transistor architecture. At 50 mA, dropout is ~200 mV; at 10 mA, it drops to ~60 mV. Designers must ensure input voltage remains ≥ (3.3 V + dropout) across the full operating current range.
LP2950ACDT-3.3RK 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):
- 3.3V
- 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-3.3RK FAQ
1.How can I place an order for LP2950ACDT-3.3RK through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2950ACDT-3.3RK 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-3.3RK reliable?
The price and inventory of LP2950ACDT-3.3RK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2950ACDT-3.3RK is usually 5 days.
3.What payment methods are accepted for LP2950ACDT-3.3RK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2950ACDT-3.3RK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2950ACDT-3.3RK?
LP2950ACDT-3.3RK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2950ACDT-3.3RK 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-3.3RK?
For technical support, including LP2950ACDT-3.3RK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2950ACDT-3.3RK requirements.
6.How does Aetrix verify that LP2950ACDT-3.3RK is sourced from the original manufacturer or authorized distributors?
All LP2950ACDT-3.3RK 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-3.3RK meets industry standards.
7.What is the process for return or replacement of LP2950ACDT-3.3RK?
All LP2950ACDT-3.3RK units undergo pre-shipment inspection (PSI). If there is an issue with LP2950ACDT-3.3RK, 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-3.3RK part is unused and in its original packaging.
Return procedure for LP2950ACDT-3.3RK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP2950ACDT-3.3RK 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…
