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Texas Instruments LP2950CZ-3.3
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- Part No.:
- LP2950CZ-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LP2950CZ-3.3.pdf
- Description:
- IC REG LINEAR 3.3V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
LP2950CZ-3.3 from Texas Instruments is a fixed-output 3.3 V, 100 mA micropower low-dropout (LDO) linear voltage regulator in TO-92 package, featuring 0.5% typical output voltage accuracy, 75 µA typical quiescent current, and 380 mV dropout at full load - designed for battery-powered systems requiring stable low-power regulation.
For engineers reviewing the LP2950CZ-3.3 datasheet, LP2950CZ-3.3 pinout, LP2950CZ-3.3 application, or LP2950CZ-3.3 equivalent, key selection considerations include guaranteed 100 mA output current, ±1% output tolerance over temperature, compatibility with low-ESR ceramic capacitors (1 µF input / 2.2 µF output), and absence of shutdown or error flag functionality compared to LP2951 variants.
Technical Context
The LP2950CZ-3.3 implements a PNP-based pass transistor architecture enabling ultra-low quiescent current (75 µA typ.) that increases only slightly in dropout - critical for extending battery life. Its internal 1.235 V reference and precision trimming yield tight initial tolerance (±0.5% typ.) and low 20 ppm/°C temperature coefficient.
Unlike the LP2951-N family, the LP2950CZ-3.3 lacks feedback, shutdown, error flag, or SENSE pins - it is a strictly 3-pin fixed-voltage regulator with IN, OUT, and GND terminals. It operates across 2.3 V to 30 V input range and maintains regulation down to 3.3 V + 380 mV input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1% over full operating temperature (−40°C to +125°C) - ensures reliable logic-level supply for 3.3 V microcontrollers and sensors. |
| Max Output Current | 100 mA - sufficient for low-power MCU cores, RF transceivers, and analog front-ends without thermal derating in TO-92. |
| Dropout Voltage | 380 mV at 100 mA - enables operation from single-cell Li-ion (3.4 V min) or two-cell alkaline (3.6 V min) sources. |
| Quiescent Current | 75 µA typical - draws <1 µA additional current in dropout, preserving battery runtime in standby modes. |
| Line Regulation | 0.03% typical (ΔVOUT/VOUT per ΔVIN) - minimizes output variation across wide input ranges (e.g., 4.5 V to 28 V). |
| Load Regulation | 0.04% typical (ΔVOUT/VOUT per 100 µA–100 mA load change) - maintains stable voltage under dynamic digital loads. |
| Temp Coefficient | 20 ppm/°C - contributes ≤±3.3 mV drift over −40°C to +125°C, supporting precision analog sensing. |
Pinout & Package
LP2950CZ-3.3 is housed in a through-hole TO-92 (LP) package (4.30 mm × 4.30 mm body), optimized for legacy compatibility and manual assembly. Pin 1 = OUT, Pin 2 = GND, Pin 3 = IN - no exposed thermal pad or auxiliary control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Regulated output terminal | Delivers stable 3.3 V to load; requires 2.2 µF low-ESR ceramic capacitor for stability. |
| GND (Pin 2) | Power and reference ground | Common return path for input, output, and internal reference; must be low-impedance. |
| IN (Pin 3) | Unregulated input supply | Accepts 2.3 V–30 V; minimum headroom = 380 mV at 100 mA for regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output | Factory-trimmed for ±1% tolerance across −40°C to +125°C - eliminates external resistor network and layout complexity. |
| Low dropout voltage | 380 mV at 100 mA - enables use with aging batteries or low-headroom supplies where conventional regulators fail. |
| Micropower operation | 75 µA quiescent current - reduces standby power by >90% vs. standard LDOs, critical for coin-cell or energy-harvesting systems. |
| Stable with ceramic caps | Validated with 1 µF input / 2.2 µF output ceramic capacitors (10 mΩ–6 Ω ESR) - avoids costly tantalum or electrolytic alternatives. |
| Internal protection | Foldback current limiting and thermal shutdown - prevents damage during short-circuit or overload without external circuitry. |
Applications
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 3.3 V supply for ultra-low-power ADC, BLE radio, and sensor interface ASIC. Use Value: 75 µA quiescent current extends battery life beyond 5 years in sleep mode; 380 mV dropout allows operation until battery reaches 3.68 V. |
Use Scenario: Wireless vibration sensor node mounted on rotating machinery, powered by rechargeable Li-ion. IC Role / Device Role / Timing Role: Clean 3.3 V rail for MEMS accelerometer and ultra-low-power MCU during intermittent wake-up bursts. Use Value: ±1% output accuracy ensures consistent ADC reference; low noise (<430 µVRMS) prevents signal corruption in high-resolution measurements. |
| Smart Meter Battery Backup | Automotive Body Control Module |
Use Scenario: Lithium-thionyl chloride backup supply maintaining real-time clock and nonvolatile memory during AC mains failure. IC Role / Device Role / Timing Role: Always-on 3.3 V regulator sustaining RTC, SRAM, and tamper-detection circuitry. Use Value: 20 ppm/°C tempco guarantees <±10 mV drift over −40°C to +85°C ambient - preserves timekeeping accuracy across seasons. |
Use Scenario: Door module with LIN transceiver, LED drivers, and position sensors, powered from 12 V vehicle bus. IC Role / Device Role / Timing Role: Secondary 3.3 V supply for microcontroller and CAN/LIN interface ICs after primary DC-DC stage. Use Value: 30 V absolute max input withstands load-dump transients; internal thermal shutdown prevents latch-up during sustained overloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70033DBVR | 300 mV dropout at 200 mA, 50 µA IQ, SOT-23-5 package - smaller footprint but requires external enable and lacks TO-92 compatibility. | Designed for space-constrained PCBs with automated assembly; not suitable for hand-soldered or legacy TO-92 footprints. | Select TLV70033DBVR when board area is critical and SMT assembly is available; avoid if TO-92 mechanical fit or through-hole rework is required. |
| LM2936MP-3.3/NOPB | 60 µA IQ, 200 mV dropout at 50 mA, 40 V max input, SOIC-8 package - higher input voltage rating but lower output current (50 mA). | Targeted at automotive 24 V systems with harsh environments; insufficient for 100 mA loads like active RF modules. | Choose LM2936MP-3.3/NOPB for 24 V industrial inputs requiring extended voltage range; verify load current does not exceed 50 mA. |
Compared with TLV70033DBVR and LM2936MP-3.3/NOPB, LP2950CZ-3.3 uniquely balances TO-92 mechanical compatibility, 100 mA capability, and micropower performance - making it optimal for cost-sensitive, low-volume, or legacy-replacement designs where pin-for-pin upgrade is not required but functional equivalence is essential.
Availability
LP2950CZ-3.3 is available at Aetrix Electronics and suitable for portable medical devices, industrial IoT edge nodes, smart meter battery backup circuits, and automotive body control modules requiring stable component supply with long-term manufacturability.
Supply support for LP2950CZ-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 leader delivering analog and embedded processing solutions, with over 50 years of power management innovation and broad distribution infrastructure.
The LP2950-N series was engineered specifically for battery-powered and low-quiescent-current applications - emphasizing dropout efficiency, output accuracy, and robustness in space- and energy-constrained systems.
FAQ
What is the maximum input voltage rating for LP2950CZ-3.3?
The LP2950CZ-3.3 has an absolute maximum input voltage of 30 V, with recommended operation up to 30 V. This allows use in 24 V industrial systems or automotive applications with transient suppression. Exceeding 30 V risks permanent damage per the Absolute Maximum Ratings table in the TI SNVS764Q datasheet.
Does LP2950CZ-3.3 support shutdown or enable functionality?
No, LP2950CZ-3.3 does not include shutdown, enable, or error flag pins - it is a 3-pin fixed-output regulator (IN, OUT, GND) without control logic. For shutdown capability, consider the pin-compatible LP2951CZ-3.3, which adds SHUTDOWN and ERROR pins in an 8-pin package.
What output capacitor value and type is required for LP2950CZ-3.3 stability?
LP2950CZ-3.3 requires a minimum 2.2 µF ceramic output capacitor with ESR between 10 mΩ and 6 Ω. TI validates stability with X7R/X5R dielectrics; aluminum or tantalum capacitors are not recommended due to ESR mismatch and potential oscillation.
Is LP2950CZ-3.3 suitable for automotive applications?
LP2950CZ-3.3 is qualified for industrial temperature range (−40°C to +125°C) and supports 30 V input, meeting many automotive body electronics requirements. However, it is not AEC-Q100 qualified; for certified automotive use, TI recommends the LP2950ACZ-3.3 variant with enhanced reliability testing.
How does the dropout voltage of LP2950CZ-3.3 vary with load current?
LP2950CZ-3.3 dropout voltage is 50 mV at 100 µA, rising to 380 mV at 100 mA - a near-linear increase due to its PNP pass element's RDS(ON). At 50 mA, dropout is approximately 200 mV, enabling efficient operation across partial-load conditions common in sensor polling cycles.
LP2950CZ-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Tray
- 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):
- 0.6V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 120 µA
- Current - Supply (Max):
- 14 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:
- TO-92-3
LP2950CZ-3.3 FAQ
1.How can I place an order for LP2950CZ-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2950CZ-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 LP2950CZ-3.3 reliable?
The price and inventory of LP2950CZ-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 LP2950CZ-3.3 is usually 5 days.
3.What payment methods are accepted for LP2950CZ-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2950CZ-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2950CZ-3.3?
LP2950CZ-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2950CZ-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 LP2950CZ-3.3?
For technical support, including LP2950CZ-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2950CZ-3.3 requirements.
6.How does Aetrix verify that LP2950CZ-3.3 is sourced from the original manufacturer or authorized distributors?
All LP2950CZ-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 LP2950CZ-3.3 meets industry standards.
7.What is the process for return or replacement of LP2950CZ-3.3?
All LP2950CZ-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP2950CZ-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 LP2950CZ-3.3 part is unused and in its original packaging.
Return procedure for LP2950CZ-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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