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onsemi LP2951CN-3.3G
- Part No.:
- LP2951CN-3.3G
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LP2951CN-3.3G.pdf
- Description:
- IC REG LINEAR 3.3V 100MA 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:354
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Product details
Overview
LP2951CN-3.3G from onsemi is a micropower, low-dropout linear voltage regulator in an 8-pin PDIP package, delivering 3.3 V ±0.5% output at up to 100 mA with 75 µA quiescent current, 350 mV dropout at full load, and integrated error flag and logic-level shutdown - used in battery-powered microcontroller power rails and portable instrumentation.
For engineers reviewing the LP2951CN-3.3G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.3 V output tolerance, shutdown control interface, open-collector error output timing behavior, thermal derating in PDIP, and compatibility with 1.0 µF ceramic output capacitance for stability.
Technical Context
The LP2951CN-3.3G integrates a precision 1.235 V bandgap reference, error amplifier with direct feedback access (Pin 7), and comparator-based error detection that asserts low when output drops >5% below nominal - independent of setpoint. Its PNP pass transistor enables low dropout and reverse-current blocking.
Shutdown is implemented via TTL/CMOS-compatible input (Pin 3) requiring <0.7 V for enable and >2.0 V for disable, drawing only 35–450 µA depending on applied voltage. The error output (Pin 5) is open-collector, rated for 400 µA sink, and requires external pull-up to VOUT or system rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300 V ±0.5% at TA = 25°C; maintains regulation down to 3.254 V over −40°C to +125°C |
| Dropout Voltage | 350 mV max at 100 mA load - enables operation from 3.65 V input in worst-case thermal conditions |
| Quiescent Current | 75 µA typical at no load - extends battery life in always-on sensor nodes |
| Line Regulation | 0.04% typical (0.10% max) - ensures stable 3.3 V despite input ripple or battery sag |
| Load Regulation | 0.05% typical (0.10% max) - holds output within ±1.65 mV across 100 µA–100 mA load range |
| Error Flag Threshold | Triggers at −5.0% output deviation (e.g., 3.135 V for 3.3 V output) - provides deterministic power-good signaling |
| Shutdown Input Logic | Active-low enable: <0.7 V = ON, >2.0 V = OFF - interfaces directly with MCU GPIO without level-shifting |
Pinout & Package
LP2951CN-3.3G uses an 8-pin plastic dual-in-line package (PDIP-8, Case 626), with leads bent for through-hole mounting. Thermal resistance is 105°C/W junction-to-ambient (free-air).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated 3.3 V supply node; requires ≥1.0 µF ceramic capacitor to ground for stability |
| 2 | Sense | Feedback sense point for internal 3.3 V divider; tied to Pin 1 in fixed-output mode |
| 3 | Shutdown | Logic-level input: <0.7 V enables regulator, >2.0 V disables output and reduces IQ to ≤10 µA |
| 4 | Input | Unregulated DC input; must be ≥3.65 V under full load to maintain regulation |
| 5 | Error Output | Open-collector comparator output; sinks 400 µA when VOUT falls >5% - requires external pull-up |
| 6 | VO Tap | Internal 5.0 V reference tap; used with Pin 7 to configure fixed 5.0 V output (not active in -3.3G variant) |
| 7 | Feedback | Direct access to error amplifier input; enables adjustable output (1.25–29 V) or precision trimming |
| 8 | GND | Analog ground reference; must be low-impedance connection shared with output capacitor ground |
Key Features
| Feature | Design Value |
|---|---|
| Low-quiescent-current regulation | 75 µA bias current enables >1-year runtime on coin-cell batteries in standby |
| Programmable error flag threshold | Fixed −5% trip point referenced to internal 1.235 V bandgap - eliminates external monitoring circuitry |
| Logic-compatible shutdown | Direct GPIO control without level shifters or external drivers - simplifies power sequencing |
| Stability with minimal capacitance | Guaranteed stable with 1.0 µF ceramic output cap - reduces BOM count and board space vs. electrolytic solutions |
| Integrated protection | Thermal shutdown and current limiting prevent damage during overload or ambient temperature excursions |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 battery with BLE transmission every 5 minutes. IC Role / Device Role / Timing Role: Primary 3.3 V supply for ultra-low-power MCU and analog front-end; error flag triggers battery-replacement alert. Use Value: 75 µA quiescent current extends battery life to 18+ months; 350 mV dropout allows usable runtime down to 2.95 V battery voltage. | Use Scenario: DIN-rail mounted analog input module converting 4–20 mA signals in factory automation. IC Role / Device Role / Timing Role: Local 3.3 V rail for isolated ADC and digital isolator; shutdown controlled by host controller during maintenance. Use Value: Shutdown mode draws ≤10 µA - preserves backup capacitor charge during extended power loss; ±0.5% output ensures 16-bit ADC reference accuracy. |
| Automotive Body Control Units | Smart Home Hub Power Management |
Use Scenario: Door module with LIN transceiver, LED drivers, and wake-on-LIN functionality. IC Role / Device Role / Timing Role: Always-on 3.3 V supply for LIN PHY and sleep-state logic; error flag signals undervoltage during cranking. Use Value: Error output asserts at 3.135 V - provides early warning before brownout resets; operates from 5.5 V battery down to 3.65 V input. | Use Scenario: Wi-Fi/Zigbee hub with multiple radios, sensors, and USB peripherals sharing a single 5 V adapter. IC Role / Device Role / Timing Role: Secondary 3.3 V regulator for RF SoC and memory; shutdown coordinated with radio sleep states. Use Value: 0.05% load regulation prevents RF sensitivity degradation across 10 µA–100 mA dynamic current; 1.0 µF ceramic cap enables compact 2-layer PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951CD-3.3R2G | SOIC-8 package (surface-mount), same electrical specs, 0.5% tolerance | Requires reflow assembly; better thermal performance (RJA = 180°C/W vs. 105°C/W) but lower max power in free air | Select for automated production and higher-density layouts where thermal mass is managed. |
| NCV2951ACD-3.3R2G | Automotive-grade variant (AEC-Q100 qualified), same pinout and specs, NCV prefix | Required for automotive body electronics; includes PPAP documentation and extended qualification testing | Select for automotive OEM or Tier-1 designs needing certified reliability and change control. |
Compared with LP2951CD-3.3R2G and NCV2951ACD-3.3R2G, the LP2951CN-3.3G offers through-hole manufacturability and higher free-air power handling (105°C/W), making it optimal for prototyping, industrial controls, and low-volume assemblies where thermal derating is less constrained than in compact surface-mount modules.
Availability
LP2951CN-3.3G is available at Aetrix Electronics and suitable for portable medical devices, industrial I/O modules, automotive body controllers, and smart home hubs requiring stable component supply with long-term continuity.
Supply support for LP2951CN-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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, with leadership in power management, analog, and sensing technologies.
The LP2951 product line delivers micropower, low-dropout linear regulators for battery-critical applications - designed to maximize runtime while maintaining precision output and integrated fault signaling in space-constrained systems.
FAQ
What is the maximum input voltage rating for LP2951CN-3.3G?
The LP2951CN-3.3G has an absolute maximum input voltage of 30 V DC, with a peak transient rating of 32 V for durations under 300 ms. Operation above 30 V risks permanent damage. For reliable 3.3 V regulation, input should remain ≥3.65 V under full 100 mA load to stay above dropout, and ≤29 V to maintain margin against maximum rating. Designers commonly use 5–12 V inputs in battery-backed or wall-adapter applications.
Does LP2951CN-3.3G require an external capacitor for stability?
Yes, LP2951CN-3.3G requires a minimum 1.0 µF ceramic output capacitor between Pin 1 (Output) and Pin 8 (GND) for guaranteed stability across all operating conditions. The datasheet confirms stability with aluminum, tantalum, or multilayer ceramic capacitors; solid tantalum or X7R/X5R ceramics are recommended. Using <1.0 µF may cause oscillation, especially at light loads or elevated temperatures.
How does the error output of LP2951CN-3.3G behave during power-up?
The error output (Pin 5) of LP2951CN-3.3G is an open-collector output that remains high-impedance until input voltage reaches ~1.3 V, then pulls low once output reaches ~95% of 3.3 V (i.e., ~3.135 V). It transitions high again only after VIN exceeds ~3.65 V and regulation is fully established. This provides clean power-on reset timing without external RC networks - critical for microcontroller initialization sequences.
Can LP2951CN-3.3G be used in adjustable-output configuration?
Yes, LP2951CN-3.3G supports adjustable output from 1.25 V to 29 V using external resistors on Pins 2 (Sense) and 7 (Feedback), per the equation VOUT = 1.235 V × (1 + R1/R2) − IFB×R1. Though configured as 3.3 V fixed-output, its internal feedback node is accessible. Designers must disconnect Pin 2 from Pin 1 and route external divider to Pin 7 - retaining full error flag and shutdown functionality.
What is the thermal performance of LP2951CN-3.3G in free-air conditions?
LP2951CN-3.3G in PDIP-8 package has a junction-to-ambient thermal resistance (RJA) of 105°C/W in free-air mounting. At 100 mA load with 5 V input, power dissipation is ~170 mW, resulting in ~18°C junction rise above ambient. Derating begins above 85°C ambient; maximum allowable ambient is +125°C only when power dissipation is limited to ~380 mW - achievable only at very light loads or with heatsinking.
LP2951CN-3.3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LP2951CN-3.3G FAQ
1.How can I place an order for LP2951CN-3.3G through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CN-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 LP2951CN-3.3G reliable?
The price and inventory of LP2951CN-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 LP2951CN-3.3G is usually 5 days.
3.What payment methods are accepted for LP2951CN-3.3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CN-3.3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CN-3.3G?
LP2951CN-3.3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CN-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 LP2951CN-3.3G?
For technical support, including LP2951CN-3.3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CN-3.3G requirements.
6.How does Aetrix verify that LP2951CN-3.3G is sourced from the original manufacturer or authorized distributors?
All LP2951CN-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 LP2951CN-3.3G meets industry standards.
7.What is the process for return or replacement of LP2951CN-3.3G?
All LP2951CN-3.3G units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CN-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 LP2951CN-3.3G part is unused and in its original packaging.
Return procedure for LP2951CN-3.3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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