My Inquiry
My Account
Texas Instruments LP2951ACMX-3.3
- Part No.:
- LP2951ACMX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951ACMX-3.3.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,525
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP2951ACMX-3.3 from Texas Instruments is a micropower, low-dropout linear voltage regulator with fixed 3.3 V output, 100 mA rated output current, ±0.5% initial accuracy at 25°C, and 75 µA typical quiescent current - designed for battery-powered systems requiring stable low-voltage supply with shutdown control and error flag indication.
For engineers reviewing the LP2951ACMX-3.3 datasheet, LP2951ACMX-3.3 pinout, LP2951ACMX-3.3 application, or LP2951ACMX-3.3 equivalent, this page delivers verified electrical specs, SOIC-8 package mapping, functional pin roles, real-world use cases in portable instrumentation and IoT edge nodes, and two validated alternative parts with documented differences in output accuracy and shutdown behavior.
Technical Context
The LP2951ACMX-3.3 integrates a precision 1.235 V bandgap reference, error amplifier, PNP pass transistor, and dedicated comparator circuitry to support both regulation and monitoring functions. Its architecture enables simultaneous operation as a 3.3 V regulator and system-level voltage supervisor via ERROR and SHUTDOWN pins.
It operates across 2.3 V to 30 V input range with dropout as low as 50 mV at 100 µA load and 380 mV at 100 mA, while maintaining line regulation ≤0.03% and load regulation ≤0.04% under nominal conditions - enabling reliable performance in wide-input, low-power embedded applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±0.5% (typical) at 25°C; ensures stable MCU core/logic rail without external feedback resistors. |
| Max Output Current | 100 mA - sufficient for microcontrollers, sensors, and RF transceivers in portable devices. |
| Quiescent Current | 75 µA typical - extends battery life in always-on or low-duty-cycle monitoring systems. |
| Dropout Voltage | 380 mV at 100 mA - allows operation down to VIN = 3.68 V while sustaining 3.3 V output. |
| Line Regulation | 0.03% typical - minimizes output variation across input voltage swings (e.g., depleting Li-ion cell). |
| Error Flag Threshold | ~5% output drop (≈165 mV at 3.3 V) triggers ERROR low - usable for power-on reset or brownout detection. |
| Shutdown Input Logic | Active-high SHUTDOWN pin; ≥2 V disables regulator, reducing ground current to ≤10 µA. |
Pinout & Package
LP2951ACMX-3.3 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed thermal pad connected internally to GND (Pin 4). The package supports standard reflow and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Regulated output | Delivers stable 3.3 V to load; requires 2.2 µF low-ESR capacitor for stability. |
| SENSE (Pin 2) | Output voltage sense | Connects directly to OUT for fixed-voltage mode; enables remote sensing in adjustable configurations. |
| SHUTDOWN (Pin 3) | Enable/disable control | Logic-high ≥2 V disables regulator; pulls ground current to ≤10 µA in shutdown. |
| GND (Pin 4) | Ground reference | Common return path; DAP (exposed pad) must be soldered to PCB ground plane. |
| ERROR (Pin 5) | Error flag output | Open-collector logic-low when VOUT drops >5%; sinks up to 400 µA for reset assertion. |
| VTAP (Pin 6) | Internal divider tap | Provides access to internal 1.235 V reference node; used with external resistors for programmable outputs. |
| FEEDBACK (Pin 7) | Voltage feedback input | Accepts external resistor divider; tied to VTAP in fixed 3.3 V configuration. |
| IN (Pin 8) | Input supply | Accepts 2.3 V–30 V input; requires 1 µF ceramic bypass capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output with 0.5% initial tolerance | Eliminates need for external feedback network and reduces BOM count in space-constrained designs. |
| Logic-compatible shutdown input | Enables system-level power sequencing and ultra-low standby current (<10 µA) without external MOSFET. |
| Dedicated ERROR flag with hysteresis | Provides clean, noise-immune undervoltage warning for microcontroller reset or fault logging. |
| Stable with low-ESR capacitors (10 mΩ–6 Ω) | Supports cost-effective ceramic output caps instead of bulkier tantalum or aluminum electrolytics. |
| Thermal and current limiting protection | Prevents damage during overload or short-circuit events; foldback current limit avoids thermal runaway. |
Applications
| Portable Medical Sensors | Industrial IoT Edge Node |
|---|---|
Use Scenario: Wearable ECG sensor powered by single-cell Li-ion battery (2.7–4.2 V). IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying analog front-end, ADC, and BLE SoC. Use Value: Low 75 µA quiescent current extends battery runtime; ERROR flag triggers firmware-initiated shutdown before deep discharge. |
Use Scenario: Remote temperature/humidity node using LoRaWAN radio and microcontroller. IC Role / Device Role / Timing Role: System power regulator with programmable wake-up via SHUTDOWN pin. Use Value: 380 mV dropout enables full 3.3 V operation until battery reaches 3.68 V; shutdown reduces sleep current to <10 µA. |
| Smart Metering Interface | Automotive Body Control Module |
Use Scenario: Sub-1 W auxiliary rail for optical isolation and RS-485 transceiver in utility meter. IC Role / Device Role / Timing Role: Isolated 3.3 V supply with brownout detection for communication ICs. Use Value: ERROR output drives optocoupler input to signal host MCU of supply degradation before data corruption. |
Use Scenario: Low-power domain for CAN transceiver and microcontroller in door module. IC Role / Device Role / Timing Role: Secondary regulated rail activated only during key-fob wake-up event. Use Value: Active-high SHUTDOWN allows direct connection to microcontroller GPIO; eliminates need for level-shifting circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951CMX-3.3 | Same SOIC-8 package and pinout; wider initial tolerance (±1%) and higher max quiescent current (120 µA). | Suitable for cost-sensitive industrial controls where 1% output accuracy is acceptable. | Select LP2951CMX-3.3 if budget constraints outweigh tight regulation requirements. |
| TLV70733PDQNR | Lower quiescent current (25 µA), smaller X2SON-4 package, no ERROR/SHUTDOWN pins; 300 mA output. | Lacks supervision features; best for simple point-of-load regulation without system monitoring. | Choose TLV70733PDQNR when footprint and ultra-low IQ are critical, and error signaling is handled externally. |
Compared with LP2951CMX-3.3 and TLV70733PDQNR, the LP2951ACMX-3.3 uniquely balances high accuracy (±0.5%), integrated supervision (ERROR/SHUTDOWN), and proven reliability in extended-temperature industrial deployments - making it optimal for safety-aware or battery-life-critical designs where feature completeness matters more than minimal size or lowest IQ.
Availability
LP2951ACMX-3.3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, smart metering interfaces, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for LP2951ACMX-3.3 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer applications.
The LP2951 series was designed specifically for micropower, low-dropout regulation in battery-operated and energy-conscious systems - emphasizing accuracy, supervision capability, and robustness across wide temperature and input ranges.
FAQ
What is the maximum input voltage rating for LP2951ACMX-3.3?
The LP2951ACMX-3.3 has an absolute maximum input voltage of 30 V, with recommended operating range from 2.3 V to 30 V. Operation above 30 V risks permanent damage per TI's Absolute Maximum Ratings table; sustained operation near 30 V requires thermal derating based on PCB layout and ambient conditions.
Does LP2951ACMX-3.3 require an external capacitor on the FEEDBACK pin?
No - LP2951ACMX-3.3 is a fixed-output variant; FEEDBACK (Pin 7) is internally connected to VTAP (Pin 6) and does not require external components. External resistors are only needed when configuring the device for adjustable output voltages outside its factory-trimmed 3.3 V setting.
How does the ERROR pin behave during startup of LP2951ACMX-3.3?
The ERROR pin remains high-impedance (open-drain) until VOUT reaches ~95% of nominal (≈3.14 V). It transitions low only after VOUT stabilizes and then drops below the threshold - preventing false resets during power ramp-up. This behavior is confirmed in TI's Electrical Characteristics table under "ERROR COMPARATOR" section.
Can LP2951ACMX-3.3 be used with ceramic output capacitors?
Yes - LP2951ACMX-3.3 is explicitly characterized for stability with ceramic capacitors having ESR between 10 mΩ and 6 Ω. A 2.2 µF X7R ceramic capacitor is recommended per TI's Application Curves and Layout Guidelines, eliminating need for bulkier electrolytic types.
What is the thermal resistance (RθJA) of LP2951ACMX-3.3 in SOIC-8 package?
The junction-to-ambient thermal resistance (RθJA) for LP2951ACMX-3.3 in SOIC-8 (D) package is 117.7°C/W under JEDEC High-K board conditions. This value assumes standard PCB copper area; adding thermal vias under the exposed pad can reduce effective RθJA by up to 30% in optimized layouts.
LP2951ACMX-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.235V (3.3V)
- Voltage - Output (Max):
- 29V
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 120 µA
- Current - Supply (Max):
- 14 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LP2951ACMX-3.3 FAQ
1.How can I place an order for LP2951ACMX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951ACMX-3.3 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 LP2951ACMX-3.3 reliable?
The price and inventory of LP2951ACMX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951ACMX-3.3 is usually 5 days.
3.What payment methods are accepted for LP2951ACMX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951ACMX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951ACMX-3.3?
LP2951ACMX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951ACMX-3.3 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 LP2951ACMX-3.3?
For technical support, including LP2951ACMX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951ACMX-3.3 requirements.
6.How does Aetrix verify that LP2951ACMX-3.3 is sourced from the original manufacturer or authorized distributors?
All LP2951ACMX-3.3 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 LP2951ACMX-3.3 meets industry standards.
7.What is the process for return or replacement of LP2951ACMX-3.3?
All LP2951ACMX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP2951ACMX-3.3, 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 LP2951ACMX-3.3 part is unused and in its original packaging.
Return procedure for LP2951ACMX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP2951ACMX-3.3 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
