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onsemi LP2951ACD-3.0
- Part No.:
- LP2951ACD-3.0
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951ACD-3.0.pdf
- Description:
- IC REG LINEAR 3V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,098
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Product details
Overview
LP2951ACD-3.0 from onsemi is a precision 3.0 V, ±0.5% fixed-output, low-dropout linear voltage regulator in SOIC-8 package, delivering up to 100 mA with 75 µA quiescent current, 350 mV dropout at 100 mA, and integrated error flag and logic-level shutdown - used in battery-powered microcontroller power rails, sensor signal conditioning, and portable instrumentation.
For engineers reviewing the LP2951ACD-3.0 datasheet, pinout, applications, or equivalent options, key selection criteria include output voltage tolerance (±0.5% at 25°C), dropout behavior across load/temperature, shutdown input logic thresholds, error comparator hysteresis, and SOIC-8 thermal resistance (RJA = 180°C/W).
Technical Context
The LP2951ACD-3.0 integrates a 1.235 V bandgap reference, error amplifier with external feedback access (Pin 7), open-collector error comparator (Pin 5), and CMOS/TTL-compatible shutdown input (Pin 3). Its internal resistor divider sets nominal 3.0 V output when Pin 1 (VOUT) connects to Pin 2 (SENSE) and Pin 6 (VO TAP) connects to Pin 7 (FB).
Regulation stability requires ≥1.0 µF output capacitor; for adjustable configurations or low-temperature operation, ≥3.3 µF is recommended. The device features internal current limiting (220–300 mA) and thermal shutdown, with bias current rising from 93 µA (no load) to 4.0 mA (100 mA load).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000 V ±0.5% at TA = 25°C; ±0.6% over −40°C to +125°C - enables precision analog/sensor supply without external trimming. |
| Dropout Voltage | 350 mV max at 100 mA load - supports regulation from 3.35 V input, critical for single-cell Li-ion or 3.3 V system rail margin. |
| Quiescent Current | 93 µA typical at 100 µA load - extends battery life in always-on monitoring nodes beyond 10 years on CR2032. |
| Line Regulation | 0.04% typical (Vin = 4.0 V to 30 V) - maintains stable output despite battery discharge or unregulated DC input ripple. |
| Error Flag Threshold | 5.0% below nominal (±150 mV hysteresis) - provides reliable power-on reset or brownout detection without external comparators. |
| Shutdown Input | Logic "0" ≤ 0.7 V (ON), "1" ≥ 2.0 V (OFF); ISHTDN = 35–600 µA - interfaces directly with MCU GPIOs without level-shifting. |
| Thermal Resistance | RJA = 180°C/W (SOIC-8) - limits junction temperature rise to <45°C at 100 mA with 25°C ambient and minimal copper. |
Pinout & Package
LP2951ACD-3.0 is housed in an 8-pin SOIC-8 (Case 751) surface-mount package with exposed pad not electrically connected. Pin 1 is Output (VOUT), Pin 2 is Sense (SENSE), Pin 3 is Shutdown (SD), Pin 4 is Ground (GND), Pin 5 is Error Output (ERROR), Pin 6 is VO Tap (VO T), Pin 7 is Feedback (FB), and Pin 8 is Input (VIN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output (VOUT) | Regulated 3.0 V supply node; must connect ≥1.0 µF ceramic/tantalum capacitor to GND for stability. |
| 2 | Sense (SENSE) | Remote sensing input; tied to Pin 1 for fixed 3.0 V mode; enables Kelvin connection for high-accuracy load regulation. |
| 3 | Shutdown (SD) | Active-high enable; pulls regulator into <10 µA standby when >2.0 V applied; compatible with 3.3 V logic. |
| 4 | Ground (GND) | Power and signal reference; requires low-inductance PCB trace to minimize noise coupling into FB and ERROR paths. |
| 5 | Error Output (ERROR) | Open-collector flag; sinks 400 µA when VOUT drops >5% - requires external pull-up (100 kΩ–1 MΩ) to VOUT or system rail. |
| 6 | VO Tap (VO T) | Internal 5.0 V reference tap; connected to Pin 7 to configure fixed 3.0 V/3.3 V/5.0 V outputs using internal divider. |
| 7 | Feedback (FB) | Inverting input of error amplifier; direct access enables programmable output (1.25 V–29 V) via external R1/R2 divider. |
| 8 | Input (VIN) | Unregulated input; accepts 4.0 V–30 V; requires ≥1 µF input bypass if >4 inches from source to prevent instability. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% initial output tolerance | Eliminates post-manufacturing calibration for 3.0 V ADC references, RTCs, and low-power MCU cores. |
| Integrated error flag with 5% hysteresis | Provides deterministic power-on reset timing and brownout detection without external RC networks or comparators. |
| Logic-level shutdown (0.7 V / 2.0 V thresholds) | Direct interface with 3.3 V microcontrollers reduces BOM count and simplifies sleep-mode sequencing. |
| 1.235 V precision reference with 15–40 nA FB bias | Enables accurate adjustable outputs down to 1.25 V with <0.2% error contribution from feedback current. |
| Stable with 1.0 µF output capacitor | Supports compact designs using low-ESR ceramic capacitors instead of larger tantalum, reducing board area and cost. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor with ultra-low-power BLE transmission and analog front-end. IC Role / Device Role / Timing Role: Primary 3.0 V supply for op-amps, ADC, and BLE SoC; ERROR flag triggers firmware-initiated shutdown during battery depletion. Use Value: 75 µA quiescent current extends CR2032 battery life to >3 years; ±0.5% output ensures consistent ADC reference accuracy across temperature. | Use Scenario: 24 V DC-powered digital input module with isolated field-side power and status reporting. IC Role / Device Role / Timing Role: Local 3.0 V rail for optocoupler LED drivers and status LEDs; SD pin controlled by FPGA to disable unused channels. Use Value: 350 mV dropout allows regulation from 3.35 V derived from 24 V via resistive divider + Zener, eliminating need for buck converter. |
| Automotive Body Control Units | Smart Home Hub Power Management |
Use Scenario: Door module with LIN transceiver, EEPROM, and wake-on-LIN functionality. IC Role / Device Role / Timing Role: Always-on 3.0 V supply for LIN PHY and EEPROM; ERROR flag signals undervoltage to MCU before brownout resets. Use Value: AEC-Q100 qualified NCV2951ACD-3.3R2G alternative available; LP2951ACD-3.0 meets automotive temp range (−40°C to +125°C) with no derating. | Use Scenario: Wi-Fi/Zigbee hub with multiple radios, touch controller, and USB peripherals. IC Role / Device Role / Timing Role: Secondary 3.0 V rail for touch IC and RF front-end biasing; SD pin synchronized with radio transmit bursts to reduce average power. Use Value: 0.04% line regulation prevents RF noise injection during AC adapter ripple; SOIC-8 footprint allows easy layout separation from noisy digital sections. |
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 at 25°C; same SOIC-8 package and pinout. | Lower precision acceptable in non-critical digital I/O rails or LED biasing where 3.0 V ±30 mV is sufficient. | Select when cost sensitivity outweighs need for ±0.5% reference-grade accuracy. |
| NCV2951ACD-3.3R2G | Automotive-grade (AEC-Q100); 3.3 V output; identical electrical specs except output voltage and qualification. | Required for under-hood or body-control modules needing PPAP documentation and extended reliability testing. | Choose for automotive OEM designs requiring certified components; not drop-in due to different output voltage. |
Compared with LP2951CD-3.0R2G, the LP2951ACD-3.0 offers tighter initial tolerance for analog-sensitive circuits; versus NCV2951ACD-3.3R2G, it trades automotive qualification and 3.3 V output for industrial/commercial cost and 3.0 V compatibility with legacy 3.0 V logic families.
Availability
LP2951ACD-3.0 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP2951ACD-3.0 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 manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The LP2951 series belongs to onsemi's precision LDO regulator product line, designed specifically for battery-powered and low-noise systems demanding micropower operation, tight voltage tolerance, and integrated supervision functions.
FAQ
What is the maximum input voltage rating for LP2951ACD-3.0?
The LP2951ACD-3.0 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 Vdc risks permanent damage. For continuous operation, design input rails to remain ≤29 V to maintain safety margin against ripple and transients - especially critical in automotive or industrial 24 V systems where load dump spikes may exceed 30 V.
Does LP2951ACD-3.0 require an output capacitor, and what type is recommended?
Yes, the LP2951ACD-3.0 requires a minimum 1.0 µF output capacitor for stability. Solid tantalum or multilayer ceramic capacitors (X5R/X7R) with ESR <1 Ω are recommended. Aluminum electrolytics are acceptable but less stable at low temperatures. For adjustable configurations or operation below −25°C, use ≥3.3 µF. Avoid 0.1 µF ceramics alone - they fall in the unstable region per Figure 17 of the datasheet.
How does the ERROR output function on LP2951ACD-3.0, and what external components are needed?
The ERROR output on LP2951ACD-3.0 is an open-collector pin that pulls low when VOUT drops >5% (e.g., below 2.85 V for 3.0 V nominal). It requires an external pull-up resistor (100 kΩ–1 MΩ) to VOUT or another system rail. Pulling up to VOUT prevents invalid high state during power-down. The pin sinks up to 400 µA and can drive CMOS/TTL inputs directly - commonly used for microcontroller reset assertion or fault logging.
Can LP2951ACD-3.0 be configured for adjustable output voltages, and how is this done?
Yes, the LP2951ACD-3.0 can be reconfigured for adjustable outputs from 1.25 V to 29 V using external resistors R1 and R2 on Pins 7 (FB) and 6 (VO T). The formula is VOUT = VREF(1 + R1/R2) + IFB·R1, where VREF = 1.235 V and IFB ≈ −20 nA. For best accuracy, select R2 = 100 kΩ to limit IFB error to ~0.17%. Do not leave Pin 2 (SENSE) floating - tie to Pin 1 for fixed mode or to remote load for Kelvin sensing.
What is the thermal performance of LP2951ACD-3.0 in SOIC-8 package at full 100 mA load?
In SOIC-8 (RJA = 180°C/W), the LP2951ACD-3.0 dissipates up to 350 mW at 100 mA (assuming 3.35 V input → 3.0 V output). With 25°C ambient, junction temperature rises by ~63°C - reaching ~88°C, well within the 150°C max. To improve thermal margin, add ≥1 in² of 2 oz. copper pour connected to Pin 4 (GND) and use thermal vias - per Figure 29, this reduces RJA significantly.
LP2951ACD-3.0 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):
- 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-3.0 FAQ
1.How can I place an order for LP2951ACD-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951ACD-3.0 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-3.0 reliable?
The price and inventory of LP2951ACD-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951ACD-3.0 is usually 5 days.
3.What payment methods are accepted for LP2951ACD-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951ACD-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951ACD-3.0?
LP2951ACD-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951ACD-3.0 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-3.0?
For technical support, including LP2951ACD-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951ACD-3.0 requirements.
6.How does Aetrix verify that LP2951ACD-3.0 is sourced from the original manufacturer or authorized distributors?
All LP2951ACD-3.0 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-3.0 meets industry standards.
7.What is the process for return or replacement of LP2951ACD-3.0?
All LP2951ACD-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP2951ACD-3.0, 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-3.0 part is unused and in its original packaging.
Return procedure for LP2951ACD-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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