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onsemi LP2951ACD-3.0R2
- Part No.:
- LP2951ACD-3.0R2
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951ACD-3.0R2.pdf
- Description:
- IC REG LINEAR 3V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,983
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Product details
Overview
LP2951ACD-3.0R2 from onsemi is a precision 3.0 V, 100 mA low-dropout linear voltage regulator in SOIC-8 package, featuring ±0.5% initial output tolerance, 75 µA quiescent current, 350 mV dropout at 100 mA, and integrated error flag and logic-level shutdown. It serves as a stable power source for battery-powered microcontrollers, sensors, and portable instrumentation.
For engineers reviewing the LP2951ACD-3.0R2 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance under 100 mA load, error comparator trip point accuracy, shutdown input logic thresholds, and SOIC-8 thermal resistance (180°C/W).
Technical Context
The LP2951ACD-3.0R2 integrates a bandgap reference (1.235 V), error amplifier with external feedback access, open-collector error comparator with 60 mV hysteresis, and CMOS/TTL-compatible shutdown input. Its architecture supports both fixed 3.0 V operation (via internal resistor divider) and adjustable output (1.25–29 V) using external resistors on Pin 7 (FB) and Pin 6 (VO Tap).
Regulation stability relies on ≥1.0 µF output capacitance; at 100 mA load and 3.0 V output, minimum recommended ESR is <1 Ω. The device enters thermal shutdown above +150°C junction temperature and features internal current limiting (220–300 mA) and reverse-battery protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000 V ±0.5% at TA = 25°C; maintains regulation down to 2.958 V over −40°C to +125°C |
| Max Output Current | 100 mA continuous; current limit activates at 220–300 mA (short-circuit protection) |
| Dropout Voltage | 350 mV typical at 100 mA load; enables operation with Vin as low as 3.35 V |
| Quiescent Current | 93–120 µA at 100 µA load; rises to 4.0–12 mA at 100 mA load |
| Error Flag Threshold | Triggers when VOUT drops >5.0% below nominal (i.e., ≤2.85 V); open-collector output sinks 400 µA |
| Shutdown Input | Logic "0" (ON) ≤0.7 V; Logic "1" (OFF) ≥2.0 V; draws 35–50 µA at 2.4 V |
| Input Voltage Range | 4.0 V to 30 V DC; withstands 32 V transient (≤300 ms) |
Pinout & Package
LP2951ACD-3.0R2 uses an 8-pin SOIC-8 (Case 751) surface-mount package with 1.27 mm pitch and thermal resistance RJA = 180°C/W. Exposed pad is not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated 3.0 V supply rail; requires ≥1.0 µF ceramic/tantalum capacitor to ground for stability |
| 2 | Sense | Remote sensing input; tied to Pin 1 for local regulation; improves load regulation accuracy |
| 3 | Shutdown | Active-high logic input; drives regulator into <10 µA standby mode when ≥2.0 V applied |
| 4 | Input | Main unregulated DC input (4.0–30 V); bypass capacitor recommended if wire length >4 inches |
| 5 | Feedback | Direct access to error amplifier input; used with external resistors for adjustable output |
| 6 | VO Tap | Internal 5.0 V reference tap; connects to Pin 7 to configure fixed 3.0/3.3/5.0 V outputs |
| 7 | Error Output | Open-collector flag; pulled low when VOUT falls >5.0% out of regulation (e.g., ≤2.85 V @ 3.0 V) |
| 8 | GND | Power and signal ground reference; connects to PCB ground plane for thermal and noise control |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% output tolerance | Enables direct replacement of 3.0 V references in precision analog circuits without trimming |
| 350 mV dropout @ 100 mA | Extends usable battery life in single-cell Li-ion (3.0–4.2 V) and 3-cell alkaline systems |
| Integrated error flag | Provides hardware reset signal to microcontrollers during brownout-no external comparator needed |
| Logic-level shutdown | Allows system-level power sequencing via GPIO; consumes <10 µA in shutdown mode |
| Stable with 1.0 µF output cap | Reduces BOM cost and board space vs. regulators requiring ≥10 µF tantalum or polymer capacitors |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Powering low-power analog front-ends in handheld pulse oximeters and glucose meters operating from coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary 3.0 V LDO delivering stable bias to ADCs, op-amps, and Bluetooth LE radios. Use Value: 75 µA quiescent current extends battery life beyond 1 year; 350 mV dropout ensures regulation until battery reaches 3.35 V. | Use Scenario: Providing isolated 3.0 V supply for digital isolator inputs and fieldbus transceivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local regulation stage decoupling noisy 5 V or 24 V system rails for noise-sensitive communication interfaces. Use Value: ±0.5% output tolerance guarantees reliable logic-level translation; error flag signals undervoltage to watchdog circuitry. |
| Automotive Body Control Units | Smart Home Sensor Hubs |
Use Scenario: Supplying 3.0 V to CAN transceiver bias rails and EEPROMs in door module ECUs exposed to −40°C to +125°C ambient. IC Role / Device Role / Timing Role: AEC-Q100-compliant (NCV variant) voltage regulator ensuring functional safety during cold cranking and load dump events. Use Value: 30 V absolute max input withstands automotive load dump transients; thermal shutdown prevents latch-up at high ambient. | Use Scenario: Regulating power for Zigbee/Thread SoCs and MEMS environmental sensors in battery-operated smart thermostats. IC Role / Device Role / Timing Role: Always-on LDO enabling ultra-low-power sleep modes while maintaining RTC and wake-up circuitry. Use Value: Shutdown input reduces system standby current to <10 µA; error flag triggers graceful firmware shutdown before brownout. |
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 | ±1.0% output tolerance; same SOIC-8 package and pinout | Lower precision suitable for non-critical digital logic rails where cost sensitivity outweighs voltage accuracy | Select when ±1.0% tolerance meets system margin requirements and budget constraints apply |
| NCV2951ACD-3.0R2G | AEC-Q100 qualified; enhanced ESD (2 kV HBM); tighter process controls for automotive PPAP | Required for under-hood and body electronics subject to automotive qualification and change control | Choose for automotive OEM designs needing documented reliability, traceability, and extended temperature validation |
Compared with LP2951CD-3.0R2G and NCV2951ACD-3.0R2G, the LP2951ACD-3.0R2G delivers highest initial accuracy (±0.5%) for precision analog subsystems, while retaining full pin compatibility and identical thermal performance in SOIC-8.
Availability
LP2951ACD-3.0R2 is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC I/O modules, automotive body control units, and smart home sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP2951ACD-3.0R2 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 LP2951 family is designed for battery-powered and space-constrained systems requiring ultra-low quiescent current, precise fixed/adjustable output, and integrated power-good signaling-targeting portable instrumentation, wearables, and automotive sub-systems.
FAQ
What is the maximum input voltage rating for LP2951ACD-3.0R2?
The LP2951ACD-3.0R2 has an absolute maximum input voltage of 30 V DC, with capability to withstand 32 V transients for up to 300 ms. Operation beyond these limits risks permanent damage. For sustained operation, keep input within 4.0 V to 30 V, ensuring dropout margin is maintained-e.g., Vin ≥ 3.35 V for 100 mA load.
Does LP2951ACD-3.0R2 require an external capacitor for stability?
Yes, LP2951ACD-3.0R2 requires a minimum 1.0 µF output capacitor between Pin 1 (Output) and Pin 8 (GND) for guaranteed stability across all loads and temperatures. Aluminum, tantalum, or multilayer ceramic capacitors are acceptable; solid tantalum or X7R/X5R ceramics are preferred below −25°C. Lower capacitance (0.33 µF) may suffice only for loads <10 mA.
How does the error flag on LP2951ACD-3.0R2 behave during brownout?
The error flag (Pin 7) of LP2951ACD-3.0R2 is an open-collector output that pulls low when VOUT drops >5.0% below nominal (≤2.85 V). It remains low until VOUT recovers above ~2.88 V (60 mV hysteresis). An external pullup resistor (100 kΩ to 1 MΩ) to VOUT is required; pulling to another rail may cause invalid high state during power-down.
Can LP2951ACD-3.0R2 be used in adjustable-output configurations?
Yes, LP2951ACD-3.0R2 supports adjustable output from 1.25 V to 29 V using external resistors on Pin 5 (Feedback) and Pin 6 (VO Tap). The standard equation is VOUT = 1.235 V × (1 + R1/R2) + IFB×R1. With R2 = 100 kΩ, typical error from feedback bias current is reduced to 0.17%, enabling high-accuracy programmable supplies.
What thermal derating applies to LP2951ACD-3.0R2 in SOIC-8 package?
In SOIC-8 (Case 751), LP2951ACD-3.0R2 has RJA = 180°C/W. At 25°C ambient and 100 mA load with 3.35 V input (350 mW dissipation), junction temperature rise is ~63°C-well below the 150°C max. Derate linearly above 25°C ambient: max continuous current drops to ~65 mA at +85°C ambient to maintain TJ < 150°C.
LP2951ACD-3.0R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
LP2951ACD-3.0R2 FAQ
1.How can I place an order for LP2951ACD-3.0R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951ACD-3.0R2 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 LP2951ACD-3.0R2 reliable?
The price and inventory of LP2951ACD-3.0R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951ACD-3.0R2 is usually 5 days.
3.What payment methods are accepted for LP2951ACD-3.0R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951ACD-3.0R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951ACD-3.0R2?
LP2951ACD-3.0R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951ACD-3.0R2 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 LP2951ACD-3.0R2?
For technical support, including LP2951ACD-3.0R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951ACD-3.0R2 requirements.
6.How does Aetrix verify that LP2951ACD-3.0R2 is sourced from the original manufacturer or authorized distributors?
All LP2951ACD-3.0R2 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 LP2951ACD-3.0R2 meets industry standards.
7.What is the process for return or replacement of LP2951ACD-3.0R2?
All LP2951ACD-3.0R2 units undergo pre-shipment inspection (PSI). If there is an issue with LP2951ACD-3.0R2, 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 LP2951ACD-3.0R2 part is unused and in its original packaging.
Return procedure for LP2951ACD-3.0R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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