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Texas Instruments LM4120AIM5-3.0
- Part No.:
- LM4120AIM5-3.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5-3.0.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:766
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Product details
Overview
LM4120AIM5-3.0 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference in SOT-23-5 package, delivering 3.0 V ±0.2% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load. It supports ±5 mA source/sink current, consumes only 160 μA typical supply current, and features an enable pin for power-down mode (<2 μA). It is used in portable instrumentation, battery-powered data acquisition, and precision regulators where stable low-power reference voltage is critical.
For engineers reviewing the LM4120AIM5-3.0 datasheet, LM4120AIM5-3.0 pinout, LM4120AIM5-3.0 application, or LM4120AIM5-3.0 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The LM4120AIM5-3.0 implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling low-dropout operation down to 120 mV at 1 mA while maintaining 0.2% initial accuracy. Its enable pin controls analog startup/shutdown via a 6 µA typical input current threshold, with logic-high ≥2.4 V and logic-low ≤0.4 V over −40°C to 85°C.
It operates across 2 V to 12 V input range, delivers stable output with 0.01%/mA load regulation (0–1 mA), and achieves 0.008%/V line regulation. The REF pin is internally connected and must remain unconnected externally to avoid noise coupling or capacitive loading effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V ±0.2% (A-grade initial accuracy ensures minimal calibration burden in precision ADC/DAC biasing) |
| Temperature Coefficient | 50 ppm/°C (ensured from −40°C to 125°C; enables <±1.5 mV drift over full industrial range) |
| Dropout Voltage | 120 mV typical at 1 mA (allows operation with VIN as low as 3.12 V while maintaining regulation) |
| Supply Current | 160 μA typical (enables >1-year battery life in 10-μA sleep systems with periodic wake-up reference use) |
| Enable Thresholds | VH = 2.4 V, VL = 0.4 V (compatible with standard CMOS/TTL logic without level-shifting) |
| Output Current | ±5 mA (supports direct driving of op-amp inputs, SAR ADC references, or small DAC loads) |
| Noise (0.1–10 Hz) | 20 µVPP (low enough for 16-bit+ data acquisition without additional filtering) |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, tape-and-reel packaging (1000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Internally connected; must remain unconnected externally to prevent noise injection or instability |
| 2 - GND | Ground reference | Return path for load current and internal circuitry; requires low-impedance PCB connection |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for active mode; pulled to GND disables output and reduces current to <2 μA |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; minimum headroom defined by dropout voltage at target load |
| 5 - VOUT | Regulated reference output | 3.0 V ±0.2% source/sink node; stable with 0.022–0.047 µF ceramic capacitor (ESR 0.1–0.5 Ω) |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 120 mV typical at 1 mA enables operation from single-cell Li-ion (3.0–4.2 V) or 3.3 V rails with margin |
| Enable-controlled shutdown | Reduces quiescent current to <2 μA, supporting ultra-low-power duty-cycled sensing architectures |
| Source/sink capability | ±5 mA allows direct interface to op-amps, ADC references, and comparator thresholds without buffering |
| Thermal hysteresis | 0.5 mV/V over −40°C to 125°C minimizes repeatability error after thermal cycling in field-deployed equipment |
| Long-term stability | 100 ppm over 1000 hours at 25°C reduces recalibration frequency in metrology and test equipment |
Applications
| Portable Data Loggers | Battery-Powered Medical Sensors |
|---|---|
Use Scenario: Continuous 16-bit ADC sampling in handheld environmental monitors powered by coin-cell or LiPo batteries. IC Role / Device Role / Timing Role: Provides stable 3.0 V reference for SAR ADC conversion, directly sourcing bias current for front-end signal conditioning. Use Value: 160 μA supply current and 120 mV dropout extend battery life while maintaining ±0.2% full-scale accuracy across temperature and load variations. |
Use Scenario: Wearable ECG patch acquiring microvolt-level biopotentials with on-board analog front-end and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Supplies precise 3.0 V reference to instrumentation amplifiers and ADC, enabled only during active measurement windows. Use Value: Enable pin reduces average system current by >99% during sleep, and 50 ppm/°C TC ensures clinical-grade measurement consistency across body-worn thermal gradients. |
| Precision Industrial Transmitters | Automotive Cabin Sensor Modules |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in harsh factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Generates 3.0 V reference for sensor excitation and signal chain gain-setting resistors in isolated analog section. Use Value: 0.2% initial accuracy eliminates factory trim, and thermal hysteresis <0.5 mV/V ensures repeatable calibration after thermal cycling during installation or maintenance. |
Use Scenario: Occupancy and air quality sensor cluster mounted near vehicle HVAC ducts, exposed to rapid temperature transients from cabin heating/cooling cycles. IC Role / Device Role / Timing Role: Supplies regulated 3.0 V to MEMS humidity/CO₂ sensors and their analog signal conditioners. Use Value: Guaranteed 50 ppm/°C TC over −40°C to 125°C maintains sensor accuracy without software compensation, reducing MCU processing overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3030AIDBVR | 3.0 V ±0.2%, 50 ppm/°C, 50 μA supply current, no enable pin, SOT-23-5 | Lacks shutdown capability; lower quiescent current but no power-gating control | Select when lowest possible static current is prioritized and enable functionality is unnecessary |
| ADR3430ARJZ-R7 | 3.0 V ±0.1%, 10 ppm/°C max, 120 μA supply current, no enable pin, SOT-23-5 | Higher initial accuracy and lower TC, but no enable function and higher cost | Select when ultra-stable reference is required for metrology-grade instruments and power-down is handled externally |
Compared with LM4120AIM5-3.0, REF3030AIDBVR trades enable functionality for lower 50 μA supply current, while ADR3430ARJZ-R7 offers superior 10 ppm/°C TC and 0.1% accuracy at the cost of disable capability and increased BOM cost-making LM4120AIM5-3.0 optimal for battery-constrained systems needing controlled power cycling.
Availability
LM4120AIM5-3.0 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical sensors, and precision industrial transmitters requiring stable component supply with guaranteed long-term availability.
Supply support for LM4120AIM5-3.0 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The LM4120 series was designed for low-power, high-accuracy voltage referencing in space-constrained, battery-operated systems-emphasizing micropower operation, low dropout, and enable-controlled shutdown.
FAQ
What is the maximum input voltage for LM4120AIM5-3.0?
The absolute maximum input voltage for LM4120AIM5-3.0 is 14 V, but the recommended operating range is 2 V to 12 V. Operation above 12 V risks exceeding safe power dissipation limits, especially at elevated temperatures or high load currents. For reliable long-term performance, VIN should be kept ≤12 V under all conditions specified in the datasheet.
Does LM4120AIM5-3.0 require an external output capacitor?
Yes, LM4120AIM5-3.0 requires a minimum 0.022 µF ceramic output capacitor for stability. The device is optimized for 0.022–0.047 µF ceramic capacitors with ESR between 0.1 Ω and 0.5 Ω. Larger values (up to 1 µF) are permissible with tantalum capacitors, but require a 50-pF capacitor between VOUT and REF pins-though REF must remain unconnected per datasheet guidance, so such configurations are not supported for LM4120AIM5-3.0.
Can the REF pin of LM4120AIM5-3.0 be left floating?
No-the REF pin of LM4120AIM5-3.0 must remain unconnected (open), not floating. It is an internal node sensitive to noise and capacitive loading; connecting it to anything-including traces, vias, or capacitors-degrades stability and accuracy. PCB layout must isolate REF with guard rings and avoid routing nearby signals or power planes.
What is the power-down current of LM4120AIM5-3.0 when EN is grounded?
When the EN pin of LM4120AIM5-3.0 is pulled to GND, the device enters shutdown mode with supply current reduced to ≤2 μA over −40°C to 85°C. At 0.2 V on EN, current drops to 1 μA typical. This ultra-low shutdown current enables multi-year battery life in intermittently active sensor nodes where the reference is enabled only during measurement bursts.
Is LM4120AIM5-3.0 suitable for automotive applications?
LM4120AIM5-3.0 is rated for −40°C to 85°C operation and meets industrial temperature requirements. While not AEC-Q200 qualified, its guaranteed 50 ppm/°C TC over −40°C to 125°C and robust ESD ratings (±2000 V HBM) make it suitable for non-safety-critical automotive cabin modules-such as occupancy sensors or climate control interfaces-provided system-level qualification and derating are performed per OEM requirements.
LM4120AIM5-3.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- 20µVp-p
- Noise - 10Hz to 10kHz:
- 36µVp-p
- Voltage - Input:
- 2V ~ 12V
- Current - Supply:
- 275µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4120AIM5-3.0 FAQ
1.How can I place an order for LM4120AIM5-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5-3.0 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 LM4120AIM5-3.0 reliable?
The price and inventory of LM4120AIM5-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5-3.0 is usually 5 days.
3.What payment methods are accepted for LM4120AIM5-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5-3.0?
LM4120AIM5-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5-3.0 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 LM4120AIM5-3.0?
For technical support, including LM4120AIM5-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5-3.0 requirements.
6.How does Aetrix verify that LM4120AIM5-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5-3.0 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 LM4120AIM5-3.0 meets industry standards.
7.What is the process for return or replacement of LM4120AIM5-3.0?
All LM4120AIM5-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5-3.0, 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 LM4120AIM5-3.0 part is unused and in its original packaging.
Return procedure for LM4120AIM5-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120AIM5-3.0 Tags
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