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Texas Instruments LM4120AIM5-2.0/NOPB
- Part No.:
- LM4120AIM5-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,207
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Product details
Overview
LM4120AIM5-2.0/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 2.048 V output with ±0.2% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA - enabling stable biasing in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4120AIM5-2.0/NOPB datasheet, LM4120AIM5-2.0/NOPB pinout, LM4120AIM5-2.0/NOPB application, or LM4120AIM5-2.0/NOPB equivalent, key selection factors include enable-controlled power-down (ISS < 2 µA), ±5 mA source/sink capability, SOT-23-5 package compatibility, and guaranteed performance across −40°C to +85°C industrial temperature range.
Technical Context
The LM4120AIM5-2.0/NOPB implements a bandgap-based reference core with integrated enable control logic and low-impedance output buffer. Its architecture supports operation from VIN = 2 V to 12 V while maintaining regulation down to 120 mV headroom at 1 mA load.
It features an unconnected REF pin for noise-sensitive applications, a dedicated EN input requiring ~6 µA turn-on current and logic-level thresholds (VL ≤ 0.4 V, VH ≥ 2.4 V), and GND-referenced output stability ensured by internal compensation compatible with 0.022–0.047 µF ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V ±0.2% (A-grade initial accuracy - enables 12-bit DAC/ADC calibration without trimming) |
| Temperature Coefficient | 50 ppm/°C (−40°C to +125°C - ensures ≤1.024 mV drift over full extended range) |
| Dropout Voltage | 120 mV typical at 1 mA (allows regulation from 2.148 V supply - critical for single-cell Li-ion or coin-cell systems) |
| Supply Current | 160 µA typical (enables >1-year battery life in 10-µA sleep-mode systems) |
| Power-Down Current | <2 µA at EN = 0.2 V (reduces standby loss by 80× vs active mode) |
| Output Drive | ±5 mA (supports direct driving of ADC reference inputs, op-amp bias networks, or small MOSFET gates) |
| Noise (0.1–10 Hz) | 20 µVPP (low flicker noise preserves SNR in high-resolution sensor front-ends) |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Must remain unconnected - sensitive to noise and capacitive loading; PCB isolation required |
| 2 - GND | Ground reference | Return path for load current and supply current; low-impedance connection essential for accuracy |
| 3 - EN | Enable control input | Analog input with 0.4 V logic-low threshold; pull to GND for shutdown, tie to VIN for always-on operation |
| 4 - VIN | Input supply | Accepts 2 V to 12 V; dropout as low as 120 mV allows ultra-low-voltage operation |
| 5 - VOUT | Regulated output | 2.048 V precision reference; capable of sourcing or sinking up to ±5 mA |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces quiescent current to <2 µA - extends battery life in intermittent-sampling systems |
| Low dropout voltage | 120 mV at 1 mA enables use with single 2.2 V supply - ideal for energy-harvesting nodes |
| High output accuracy | ±0.2% initial tolerance eliminates need for system-level calibration in 12-bit applications |
| Source/sink capability | ±5 mA drive strength supports direct interface to SAR ADC references and analog multiplexers |
| Stable with ceramic caps | Guaranteed stability with 0.022–0.047 µF X7R ceramics - simplifies layout and reduces BOM cost |
Applications
| Portable Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and analog signal conditioning chain. Use Value: 2.048 V output matches common 16-bit full-scale codes (e.g., 0x0000–0xFFFF = 0–2.048 V), eliminating scaling math in firmware. |
Use Scenario: Wireless sensor node logging temperature, humidity, and pressure at 1 Hz with BLE transmission. IC Role / Device Role / Timing Role: Precision reference for multi-channel SAR ADC and low-power op-amp buffers. Use Value: 50 ppm/°C TC and <2 µA shutdown current enable 2-year battery life with ±0.1% measurement accuracy across −20°C to +60°C. |
| Precision Regulator Feedback | Medical Sensor Biasing |
Use Scenario: Low-noise LDO regulator for powering analog front-end of ECG amplifier. IC Role / Device Role / Timing Role: Stable reference for error amplifier in closed-loop feedback network. Use Value: 20 µVPP low-frequency noise prevents baseline wander; ±5 mA sink capability handles transient load steps during electrode contact detection. |
Use Scenario: Pulse oximeter with dual-wavelength photodiode signal conditioning. IC Role / Device Role / Timing Role: Reference for transimpedance amplifier gain setting and ADC full-scale calibration. Use Value: 0.2% initial accuracy ensures SpO₂ calculation repeatability across production units without per-unit trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA20+ | 2.048 V, ±0.06% initial accuracy, 3 ppm/°C TC, but higher 350 µA supply current and no enable pin | Superior long-term stability and TC for metrology-grade systems; unsuitable where power-down is required | Select when ultra-low drift dominates over quiescent power and enable functionality |
| REF3020AIDBZR | 2.048 V, ±0.2% initial accuracy, 50 ppm/°C TC, 40 µA supply current, no enable pin, SOT-23-3 package | Lower quiescent current but lacks shutdown control; 3-pin package limits routing flexibility for REF/VOUT separation | Select when minimal supply current is critical and enable functionality is not needed |
Compared with MAX6126AASA20+ and REF3020AIDBZR, the LM4120AIM5-2.0/NOPB uniquely balances A-grade accuracy, enable-controlled ultra-low-power shutdown, and SOT-23-5 pinout for REF/VOUT isolation - making it optimal for space-constrained, battery-operated systems requiring both precision and dynamic power management.
Availability
LM4120AIM5-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and precision regulator feedback requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LM4120AIM5-2.0/NOPB 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 since the 1980s.
The LM4120 series was designed specifically for micropower, low-dropout voltage reference applications in portable and industrial systems where accuracy, thermal stability, and enable-controlled power management are critical.
FAQ
What is the guaranteed initial accuracy of LM4120AIM5-2.0/NOPB over temperature?
The LM4120AIM5-2.0/NOPB is an A-grade device with ±0.2% initial output voltage accuracy at 25°C. This tolerance is maintained across the industrial temperature range (−40°C to +85°C) per TI's production testing and statistical quality control methods. The 50 ppm/°C temperature coefficient ensures total drift remains within ±0.4096 mV over that range.
Can LM4120AIM5-2.0/NOPB operate from a 2.1 V supply?
Yes - the LM4120AIM5-2.0/NOPB supports input voltages as low as 2 V. With its 120 mV typical dropout at 1 mA, it regulates stably from 2.148 V (2.048 V + 120 mV). At 2.1 V input, it delivers full 2.048 V output under light loads (<100 µA); heavier loads require higher VIN to maintain regulation, per the dropout vs. load current curve in the datasheet.
What is the function of the REF pin on LM4120AIM5-2.0/NOPB?
The REF pin on LM4120AIM5-2.0/NOPB is an internal bandgap node and must remain unconnected in all applications. It is highly sensitive to noise and capacitive loading; connecting it - even to ground or a capacitor - degrades accuracy and stability. PCB layout must isolate this pin with guard rings and avoid routing traces nearby.
How does the enable pin of LM4120AIM5-2.0/NOPB behave during power-up?
The LM4120AIM5-2.0/NOPB enable pin requires ~6 µA current to initiate startup. It has logic-level thresholds: VL ≤ 0.4 V (shutdown), VH ≥ 2.4 V (active). During power-up, if EN is tied to VIN, the device starts after VIN exceeds ~2.4 V and internal biasing stabilizes - typical start-up time is <100 µs. A minimum slew rate of 0.003 V/µs on EN prevents output glitches.
Is LM4120AIM5-2.0/NOPB compatible with ceramic output capacitors?
Yes - the LM4120AIM5-2.0/NOPB is internally compensated and stable with 0.022 µF to 0.047 µF X7R ceramic capacitors. These values provide optimal phase margin and transient response. Larger ceramics (>0.047 µF) risk instability; if >0.047 µF capacitance is needed, a tantalum capacitor must be used, and a 50-pF capacitor between VOUT and REF is required per TI application guidance.
LM4120AIM5-2.0/NOPB 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):
- 2.048V
- 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
LM4120AIM5-2.0/NOPB FAQ
1.How can I place an order for LM4120AIM5-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5-2.0/NOPB 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 LM4120AIM5-2.0/NOPB reliable?
The price and inventory of LM4120AIM5-2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120AIM5-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5-2.0/NOPB?
LM4120AIM5-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5-2.0/NOPB 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 LM4120AIM5-2.0/NOPB?
For technical support, including LM4120AIM5-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5-2.0/NOPB requirements.
6.How does Aetrix verify that LM4120AIM5-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5-2.0/NOPB 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 LM4120AIM5-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120AIM5-2.0/NOPB?
All LM4120AIM5-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5-2.0/NOPB, 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 LM4120AIM5-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4120AIM5-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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