My Inquiry
My Account
onsemi LP2951CD-3.3G
- Part No.:
- LP2951CD-3.3G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951CD-3.3G.pdf
- Description:
- IC REG LINEAR 3.3V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,547
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP2951CD-3.3G from onsemi is a 3.3 V, 100 mA low-dropout linear voltage regulator in SOIC-8 package, featuring 0.5% initial output tolerance, 350 mV dropout at 100 mA, 75 µA quiescent current, and integrated error flag and logic-level shutdown. It serves as a precision power supply for microcontroller I/O rails, sensor biasing, and portable instrumentation requiring stable low-power regulation.
For engineers reviewing the LP2951CD-3.3G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance under 100 mA load, shutdown input compatibility with 3.3 V logic, error comparator open-collector drive capability, and SOIC-8 thermal resistance (180 °C/W) for board-level thermal design.
Technical Context
The LP2951CD-3.3G integrates a 1.235 V bandgap reference, error amplifier with external feedback access (Pin 7), and an open-collector error comparator with ±60 mV hysteresis referenced to Vref. Its internal PNP pass transistor enables low dropout operation without requiring external compensation beyond a 1.0 µF output capacitor.
Shutdown control (Pin 3) accepts logic-high ≥2.0 V to disable regulation, reducing output leakage to ≤10 µA; the error output (Pin 5) asserts low when VOUT falls >5% below nominal (i.e., ≤3.135 V at 3.3 V setting), enabling power-on reset or brownout detection in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300 V ±0.5% at TA = 25°C; tight line/load regulation ensures <0.1% variation across 4.3–30 V input and 100 µA–100 mA load. |
| Dropout Voltage | 350 mV max at 100 mA load; enables regulation from 3.65 V input, critical for single-cell Li-ion or 4.2 V battery systems. |
| Quiescent Current | 75 µA typical at no load; extends battery life in always-on monitoring circuits without sacrificing startup speed. |
| Supply Current in Shutdown | ≤10 µA at VIN = 30 V and shutdown pin high; supports ultra-low-power sleep modes in portable devices. |
| Error Flag Threshold | Triggers low when VOUT ≤3.135 V (5% below 3.3 V); provides deterministic brownout detection independent of load current. |
| Thermal Resistance | RJA = 180 °C/W (SOIC-8); requires minimal PCB copper area for 100 mA continuous operation at +85°C ambient. |
| Stability Capacitor | 1.0 µF ceramic/tantalum at output; eliminates need for complex compensation networks in space-constrained designs. |
Pinout & Package
LP2951CD-3.3G is housed in an 8-pin SOIC-8 (Case 751) surface-mount package with standard 1.27 mm pitch. The exposed pad is not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated 3.3 V supply rail; connects directly to load and output capacitor (min. 1.0 µF). |
| 2 | Sense | Remote sensing input; tied to Pin 1 for local regulation or to load point for improved load regulation. |
| 3 | Shutdown | Active-high enable: ≥2.0 V disables regulator; ≤0.7 V enables; draws ≤600 µA at 30 V. |
| 4 | Ground | Power ground reference for all internal circuitry and error comparator sink path. |
| 5 | Error Output | Open-collector output; sinks up to 400 µA when VOUT out-of-regulation; requires external pull-up. |
| 6 | VO Tap | Internal 5.0 V reference tap; used with Pin 7 to configure fixed 5.0 V output or adjust feedback divider. |
| 7 | Feedback | Inverting input of error amplifier; connects to external resistor divider for adjustable outputs (1.25–29 V). |
| 8 | Input | Unregulated DC input; must exceed VOUT + dropout voltage; bypass capacitor recommended if >4" trace length. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-compatible shutdown | Direct interface with 3.3 V/5.0 V microcontrollers without level-shifting; enables system-level power sequencing. |
| Programmable output | Fixed 3.3 V output or adjustable 1.25–29 V via external resistors on Pin 7, supporting multi-rail designs with one IC family. |
| Deterministic error flag | 5% VOUT threshold with 15 mV hysteresis ensures noise-immune brownout signaling for reliable reset generation. |
| Low-noise regulation | 126 µVRMS output noise (10 Hz–100 kHz) with 0.01 µF bypass on feedback divider, suitable for ADC references and RF biasing. |
| Robust protection | Internal current limit (220–300 mA) and thermal shutdown prevent damage during short-circuit or overload conditions. |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: Continuous temperature/humidity sensing powered by two AA alkaline cells (2.4–3.2 V). IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying MCU, radio transceiver, and analog front-end. Use Value: 350 mV dropout allows full regulation down to 3.65 V input, extending usable battery life by >20% versus higher-dropout regulators. | Use Scenario: Isolated digital input conditioning with 24 V field bus and 3.3 V logic interface. IC Role / Device Role / Timing Role: Local 3.3 V supply for optocoupler drivers and FPGA configuration memory. Use Value: 0.5% output tolerance ensures reliable logic-level translation; error flag signals undervoltage on field bus before system fault. |
| Medical Wearable ECG Front-End | Automotive Body Control Module (BCM) |
Use Scenario: Low-noise analog signal chain for biopotential amplification and digitization. IC Role / Device Role / Timing Role: Clean 3.3 V bias for instrumentation amplifiers and 24-bit sigma-delta ADC. Use Value: 126 µVRMS output noise and 0.05%/W thermal regulation minimize measurement drift across body temperature range. | Use Scenario: Powering CAN transceiver and microcontroller in 12 V automotive subsystem. IC Role / Device Role / Timing Role: Secondary 3.3 V regulator fed from main 5.0 V rail, with shutdown controlled by ignition signal. Use Value: Shutdown current ≤10 µA meets ISO 16750-2 quiescent current requirements for parked vehicle battery drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951ACD-3.3R2G | Same SOIC-8 package and 3.3 V output, but specified for −40°C to +125°C operating range vs. LP2951CD-3.3G's −40°C to +125°C (both meet same spec; R2G suffix denotes tape-and-reel packaging). | No functional difference; both support identical applications including automotive and industrial environments. | Select LP2951ACD-3.3R2G for automated SMT assembly requiring tape-and-reel delivery; LP2951CD-3.3G is rail-packaged (98 units). |
| NCV2951ACD3.3R2G | Automotive-grade variant with AEC-Q100 qualification, PPAP capability, and enhanced process controls; otherwise identical electrical specs and pinout. | Required for safety-critical automotive body electronics where ASIL-B compliance is mandated. | Choose NCV2951ACD3.3R2G only when automotive qualification documentation and supply-chain traceability are contractually required. |
Compared with LP2951CD-3.3G, LP2951ACD-3.3R2G offers identical performance in tape-and-reel format for volume production, while NCV2951ACD3.3R2G adds automotive qualification overhead-neither provides pin-to-pin or functional advantage unless packaging or certification drives the decision.
Availability
LP2951CD-3.3G is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, medical wearables, and automotive body control applications requiring stable component supply with guaranteed long-term availability.
Supply support for LP2951CD-3.3G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The LP2951 product line delivers micropower, low-dropout linear regulation with integrated supervision features-designed specifically for battery longevity and system reliability in portable and harsh-environment electronics.
FAQ
What is the maximum input voltage rating for the LP2951CD-3.3G?
The LP2951CD-3.3G has an absolute maximum input voltage of 30 VDC, with a peak transient rating of 32 VDC for durations under 300 ms. Operation above 30 V risks permanent damage; for 24 V industrial systems, ensure transient suppression is implemented upstream of the LP2951CD-3.3G input pin.
Does the LP2951CD-3.3G require an external capacitor for stability?
Yes, the LP2951CD-3.3G requires a minimum 1.0 µF output capacitor connected between Pin 1 (Output) and Pin 4 (Ground) for guaranteed stability across all loads and temperatures. Ceramic, tantalum, or aluminum electrolytic types are acceptable; solid tantalum is preferred for operation below −25°C.
How does the error output of the LP2951CD-3.3G function in a microcontroller reset circuit?
The LP2951CD-3.3G error output (Pin 5) is an open-collector node that pulls low when VOUT drops >5% below 3.3 V (i.e., ≤3.135 V). When pulled up to 3.3 V with a 100 kΩ resistor, it delivers a clean reset signal to a microcontroller's active-low reset pin, asserting reset until input voltage recovers and regulation resumes.
Can the LP2951CD-3.3G be used to generate voltages other than 3.3 V?
Yes-the LP2951CD-3.3G can be reconfigured as an adjustable regulator by disconnecting Pin 2 (Sense) from Pin 1 and connecting an external resistor divider between Pin 7 (Feedback), Pin 6 (VO Tap), and ground. This enables output voltages from 1.25 V to 29 V using the formula VOUT = 1.235 V × (1 + R1/R2) + IFB×R1.
What thermal derating applies to the LP2951CD-3.3G in SOIC-8 package at 100 mA load?
With RJA = 180 °C/W and 350 mV dropout at 100 mA, the LP2951CD-3.3G dissipates 35 mW. At +85°C ambient, junction temperature rises to 85°C + (35 mW × 180 °C/W) = 91.3°C-well within the +150°C maximum rating. No derating is needed for 100 mA continuous operation up to +85°C ambient with standard PCB layout.
LP2951CD-3.3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SOIC
LP2951CD-3.3G FAQ
1.How can I place an order for LP2951CD-3.3G through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CD-3.3G 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 LP2951CD-3.3G reliable?
The price and inventory of LP2951CD-3.3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951CD-3.3G is usually 5 days.
3.What payment methods are accepted for LP2951CD-3.3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CD-3.3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CD-3.3G?
LP2951CD-3.3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CD-3.3G 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 LP2951CD-3.3G?
For technical support, including LP2951CD-3.3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CD-3.3G requirements.
6.How does Aetrix verify that LP2951CD-3.3G is sourced from the original manufacturer or authorized distributors?
All LP2951CD-3.3G 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 LP2951CD-3.3G meets industry standards.
7.What is the process for return or replacement of LP2951CD-3.3G?
All LP2951CD-3.3G units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CD-3.3G, 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 LP2951CD-3.3G part is unused and in its original packaging.
Return procedure for LP2951CD-3.3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP2951CD-3.3G 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…
