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onsemi LP2951CN-3.0G
- Part No.:
- LP2951CN-3.0G
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LP2951CN-3.0G.pdf
- Description:
- IC REG LINEAR 3V 100MA 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,855
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Product details
Overview
LP2951CN-3.0G from onsemi is a micropower, low-dropout linear voltage regulator in an 8-pin PDIP package, delivering 3.0 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 instrumentation and portable medical sensors.
For engineers reviewing the LP2951CN-3.0G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 V output tolerance over −40°C to +125°C, programmable feedback capability, open-collector error output timing behavior, and thermal shutdown performance under sustained 100 mA load.
Technical Context
The LP2951CN-3.0G 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 falls >5% below nominal (i.e., <2.85 V for 3.0 V version). Its PNP pass transistor enables ultra-low dropout and eliminates external bypass capacitor requirements for stability.
Shutdown control (Pin 3) accepts TTL/CMOS logic levels (0–0.7 V = ON; ≥2.0 V = OFF), reducing quiescent current to ≤10 µA in off-state. The error output (Pin 5) is open-collector with 400 µA sink capability and requires external pull-up - commonly used for microprocessor power-on reset or brownout detection in embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V ±0.5% at TA = 25°C; ±0.6% over −40°C to +125°C - ensures stable supply for 3.3 V I/O-tolerant MCUs without external trimming. |
| Dropout Voltage | 350 mV max at 100 mA load - enables regulation from 3.35 V input, critical for single-cell Li-ion or 4-cell alkaline operation. |
| Quiescent Current | 75 µA typical at no load; 110–170 µA in dropout - extends battery life in always-on sensor nodes beyond 5 years on CR2032. |
| Line Regulation | 0.04% typical (0.10% max) over 4.0–30 V input - maintains tight output despite wide input variation in unregulated DC supplies. |
| Load Regulation | 0.05% typical (0.10% max) from 100 µA to 100 mA - supports mixed-signal loads with analog sensors and digital logic sharing same rail. |
| Error Flag Threshold | 2.85 V (−5% of 3.0 V) with 15 mV hysteresis - provides reliable early-warning indication before system reset threshold is breached. |
| Shutdown Current | ≤10 µA at VIN = 30 V, VSHTDN = 2.0 V - enables true zero-power standby in energy-harvesting applications. |
Pinout & Package
LP2951CN-3.0G 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 3.0 V output terminal; requires ≥1.0 µF ceramic/tantalum capacitor to ground for stability. |
| 2 | Sense | Remote sense input; tied to Pin 1 for standard operation or to load point for improved regulation under PCB trace IR drop. |
| 3 | Shutdown | Active-high logic input; ≥2.0 V disables regulator, reducing IQ to ≤10 µA - compatible with 3.3 V GPIO without level shift. |
| 4 | Input | Unregulated input supply; must be ≥3.35 V for full 100 mA output; internal current/thermal limiting protects against overload. |
| 5 | Error Output | Open-collector comparator output; sinks 400 µA when VO < 2.85 V - pulled up to VO or 3.3 V rail for reset assertion. |
| 6 | VO Tap | Internal 5.0 V reference tap; used with Pin 7 to configure fixed 5.0 V mode - not used in LP2951CN-3.0G's factory-set 3.0 V configuration. |
| 7 | Feedback | Inverting input of error amplifier; accessible for adjustable output (1.25–29 V); tied internally to set 3.0 V via resistor divider. |
| 8 | GND | Analog ground reference; must be low-impedance connection shared with input/output capacitors to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-level shutdown | Enables system-level power gating using 3.3 V MCU GPIO - eliminates need for discrete MOSFET high-side switch in portable designs. |
| Open-collector error flag | Provides clean, debounced reset signal to microcontrollers without external Schmitt trigger - reduces BOM count in space-constrained PCBs. |
| Factory-trimmed 3.0 V output | Guarantees ±0.5% initial accuracy at 25°C and ±0.6% over full temperature range - removes need for post-assembly calibration in medical sensor modules. |
| Stable with 1.0 µF output cap | Supports low-ESR ceramic capacitors only - avoids costly tantalum or polymer caps while enabling fast transient response in pulse-sensing applications. |
| Internal current & thermal protection | Self-limits to ~250 mA during short-circuit and shuts down above +150°C junction - allows safe operation in sealed enclosures without heatsinking. |
Applications
| Battery-Powered Data Logger | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Continuous 1 Hz sampling of thermistor, accelerometer, and humidity sensor powered by two AA alkaline cells (2.4–3.2 V). IC Role / Device Role / Timing Role: Primary 3.0 V LDO supplying analog front-end and low-power MCU; error flag monitors battery depletion. Use Value: 75 µA quiescent current extends operational life to >2 years; 350 mV dropout enables usable runtime down to 2.65 V cell voltage. | Use Scenario: Wearable ECG patch with Bluetooth LE radio, analog signal chain, and rechargeable LiPo battery. IC Role / Device Role / Timing Role: Regulator for analog sensor bias and ADC reference; shutdown pin synchronized with BLE sleep/wake cycles. Use Value: Shutdown current ≤10 µA cuts idle power by 99% vs. active mode; error flag triggers graceful shutdown before brownout resets MCU. |
| Industrial Remote I/O Module | Smart Home Smoke Detector |
Use Scenario: DIN-rail mounted sensor interface with 24 VDC input, isolated RS-485, and local 3.0 V logic rail. IC Role / Device Role / Timing Role: Post-regulator for isolated digital circuitry; error output feeds watchdog timer to detect upstream supply faults. Use Value: 0.04% line regulation maintains accuracy across 18–32 V input range; thermal shutdown prevents latch-up during ambient >85°C operation. | Use Scenario: Battery-operated photoelectric smoke alarm with self-test, LED driver, and piezo alert. IC Role / Device Role / Timing Role: Single-supply regulator for MCU, optical chamber, and audible alarm; error flag initiates end-of-life warning. Use Value: −40°C to +125°C rating ensures reliability in attic installations; 3.0 V output matches low-voltage CMOS logic thresholds. |
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-3.0R2G | SOIC-8 package (surface-mount), same electrical specs, RJA = 180°C/W vs. 105°C/W for PDIP | Requires reflow assembly; better suited for automated production and higher-density layouts | Select when board space is constrained and volume manufacturing justifies SMT process. |
| NCV2951ACD-3.0R2G | Automotive-grade variant (AEC-Q100 qualified), identical regulation specs but enhanced ESD (2 kV HBM) and PPAP support | Required for automotive cabin sensors or industrial equipment needing ASIL-B compliance | Choose for safety-critical or automotive-qualified designs where qualification documentation is mandatory. |
Compared with LP2951CD-3.0R2G, the LP2951CN-3.0G offers superior thermal performance in free-air environments due to lower RJA, while NCV2951ACD-3.0R2G adds automotive qualification at the cost of higher unit price and longer lead times - making LP2951CN-3.0G optimal for prototyping and non-automotive industrial use.
Availability
LP2951CN-3.0G is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, industrial remote I/O modules, and smart home smoke detectors requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LP2951CN-3.0G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LP2951 series belongs to onsemi's precision linear regulator product line, designed specifically for micropower, low-dropout operation in battery-critical and thermally constrained embedded systems.
FAQ
What is the maximum input voltage rating for LP2951CN-3.0G?
The LP2951CN-3.0G has an absolute maximum input voltage rating of 30 Vdc, with a peak transient rating of 32 Vdc for durations under 300 ms. Operation above 30 Vdc risks permanent damage. For reliable 3.0 V output, input should remain ≥3.35 V to maintain regulation at full 100 mA load - verified per Electrical Characteristics Table on page 4 of the official datasheet.
Does LP2951CN-3.0G require an external capacitor on the feedback pin?
No, LP2951CN-3.0G does not require an external capacitor on the feedback pin (Pin 7) when used in its factory-configured 3.0 V fixed-output mode. The internal resistor divider sets the output, and stability is ensured with only a 1.0 µF output capacitor to ground. External feedback capacitors are needed only for adjustable configurations using Pins 6 and 7 - confirmed in Applications Information section, page 9.
Can LP2951CN-3.0G be used without load current?
Yes, LP2951CN-3.0G remains stable and in regulation with zero load current. The datasheet explicitly states "The LP2950 will remain stable and in regulation when operated with no output load" (page 9), and the LP2951 shares identical compensation architecture. Quiescent current is 75 µA typical at no load, making it ideal for always-on monitoring circuits.
What is the function of Pin 2 (Sense) on LP2951CN-3.0G?
Pin 2 (Sense) on LP2951CN-3.0G is the remote sense input for the error amplifier. In standard operation, it is tied directly to Pin 1 (Output) to regulate voltage at the IC's output pad. When routed to the load point, it compensates for PCB trace voltage drop - improving regulation accuracy under high-current or long-trace conditions. This feature is documented in Figure 1 and Applications Information (page 9).
How does the error flag behave during input voltage ramp-up?
During input voltage ramp-up, the LP2951CN-3.0G error flag (Pin 5) goes low when input reaches ~1.3 V and remains low until output exceeds 2.85 V (−5% of 3.0 V), typically at ~4.0–4.5 V input depending on load. This behavior is shown in Figure 18 and described in the Error Detection Comparator section (page 9) - providing deterministic power-on reset timing independent of input slew rate.
LP2951CN-3.0G 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):
- 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-3.0G FAQ
1.How can I place an order for LP2951CN-3.0G through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CN-3.0G 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-3.0G reliable?
The price and inventory of LP2951CN-3.0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951CN-3.0G is usually 5 days.
3.What payment methods are accepted for LP2951CN-3.0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CN-3.0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CN-3.0G?
LP2951CN-3.0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CN-3.0G 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-3.0G?
For technical support, including LP2951CN-3.0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CN-3.0G requirements.
6.How does Aetrix verify that LP2951CN-3.0G is sourced from the original manufacturer or authorized distributors?
All LP2951CN-3.0G 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-3.0G meets industry standards.
7.What is the process for return or replacement of LP2951CN-3.0G?
All LP2951CN-3.0G units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CN-3.0G, 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-3.0G part is unused and in its original packaging.
Return procedure for LP2951CN-3.0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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