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Texas Instruments LM4120AIM5-2.0
- Part No.:
- LM4120AIM5-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5-2.0.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,420
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Product details
Overview
LM4120AIM5-2.0 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 2.048 V ±0.2% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load. It features enable control, ±5 mA source/sink capability, and 160 μA typical supply current - optimized for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4120AIM5-2.0 datasheet, LM4120AIM5-2.0 pinout, LM4120AIM5-2.0 application, or LM4120AIM5-2.0 equivalent, key selection factors include its 2.048 V output (ideal for 12-bit ADCs), SOT-23-5 package footprint, industrial temperature range (−40°C to 85°C), and power-down mode (<2 μA quiescent current).
Technical Context
The LM4120AIM5-2.0 implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling stable 2.048 V output across input voltages from 2.0 V to 12 V. Its enable pin controls analog startup/shutdown with logic-compatible thresholds (VH = 2.4 V, VL = 0.4 V) and <6 µA activation current.
Designed for low-noise, high-stability operation, it achieves 36 µVPP (10 Hz–10 kHz) output noise and maintains ≤0.17%/mA load regulation over −40°C to 85°C. The REF pin is unconnected and must be isolated from PCB traces and capacitive loading to preserve accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V ±0.2% (A-grade initial accuracy; matches 12-bit full-scale reference for SAR ADCs) |
| Temperature Coefficient | 50 ppm/°C (ensured over −40°C to 125°C; enables stable performance in industrial environments) |
| Dropout Voltage | 120 mV typical at 1 mA (allows operation with VIN as low as 2.148 V; critical for single-cell Li-ion or coin-cell systems) |
| Supply Current | 160 μA typical (enables >1-year battery life in 10-μA average-current portable devices) |
| Power-Down Current | <2 μA (achieved when EN pin pulled to GND; reduces standby power by >98% vs active mode) |
| Output Drive | ±5 mA (supports direct driving of ADC reference inputs, op-amp bias networks, or small DAC loads) |
| Line Regulation | 0.008%/V (ensures <165 μV change per 1 V input shift; suitable for unregulated battery rails) |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant tin-silver (CuSn) finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Must remain unconnected; sensitive to noise and capacitance; PCB isolation required to avoid accuracy degradation |
| 2 - GND | Ground reference | Primary return path for load and supply current; low-impedance connection essential for noise immunity |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for turn-on; pulled to GND for shutdown; 6 µA typical activation current |
| 4 - VIN | Positive supply input | Accepts 2.0 V to 12 V; minimum headroom defined by dropout voltage; bypass capacitor recommended |
| 5 - VOUT | Precision reference output | 2.048 V regulated output; capable of sourcing/sinking ±5 mA; requires 0.022–0.047 µF ceramic capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled power-down | Reduces supply current to <2 μA, enabling ultra-low-power sleep modes in portable systems |
| Low dropout voltage | 120 mV typical at 1 mA allows operation from depleted batteries or low-voltage rails without regulation loss |
| High initial accuracy | ±0.2% (A-grade) eliminates need for system-level calibration in precision measurement applications |
| Wide input voltage range | 2.0 V to 12 V supports diverse power sources including single-cell Li-ion, multi-cell alkaline, and DC-DC outputs |
| Low output noise | 36 µVPP (10 Hz–10 kHz) ensures minimal quantization error in high-resolution ADC conversions |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld multimeter measuring DC voltage with 12-bit resolution. IC Role / Device Role / Timing Role: Precision 2.048 V reference for SAR ADC, ensuring full-scale match and minimizing gain error. Use Value: ±0.2% initial accuracy and 50 ppm/°C drift maintain measurement integrity across operating temperature without recalibration. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 seconds on coin cell. IC Role / Device Role / Timing Role: Low-quiescent reference powering ADC and microcontroller reference rail during active sampling. Use Value: 160 μA typical supply current and <2 μA shutdown current extend battery life beyond 2 years. |
| Industrial Process Transmitters | Medical Point-of-Care Devices |
Use Scenario: 4–20 mA loop-powered pressure transmitter with onboard signal conditioning. IC Role / Device Role / Timing Role: Stable reference for DAC generating precise current setpoint and for sensor bridge excitation. Use Value: 120 mV dropout enables operation from minimal loop voltage headroom (e.g., 12.5 V supply), preserving margin for sensing circuitry. |
Use Scenario: Portable blood glucose meter requiring accurate analog front-end for electrochemical strip reading. IC Role / Device Role / Timing Role: Primary voltage reference for low-noise instrumentation amplifier and 12-bit ADC conversion. Use Value: 36 µVPP output noise directly limits ADC effective resolution, supporting sub-1 mg/dL measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3020AIDBVR | 2.048 V ±0.2%, 50 ppm/°C, but 180 μA supply current and no enable pin | Lacks power-down capability; unsuitable for duty-cycled or ultra-low-power systems | Select LM4120AIM5-2.0 when enable-controlled shutdown is required; choose REF3020AIDBVR only if board space permits larger SOT-23-3 and power-down is unnecessary |
| ADR3420ARJZ-R7 | 2.048 V ±0.1%, 10 ppm/°C, 125 μA supply current, but no enable and higher cost | Superior accuracy and drift, yet lacks shutdown and uses different pinout (SOT-23-5 but non-compatible) | Choose ADR3420ARJZ-R7 only for metrology-grade applications where 10 ppm/°C drift is mandatory; LM4120AIM5-2.0 remains optimal for cost-sensitive industrial designs needing enable functionality |
Compared with REF3020AIDBVR and ADR3420ARJZ-R7, the LM4120AIM5-2.0 uniquely balances A-grade accuracy, integrated enable control, ultra-low shutdown current, and SOT-23-5 compatibility - making it the only option among the three that delivers both precision and programmable power management in minimal footprint.
Availability
LM4120AIM5-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4120AIM5-2.0 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 leader focused on analog and embedded processing technologies, serving industrial, automotive, and consumer markets with high-reliability components.
The LM4120 series was designed specifically for precision, low-power voltage referencing in space-constrained, battery-operated, and industrial-grade equipment - emphasizing accuracy, thermal stability, and ease of integration.
FAQ
What is the output voltage tolerance of the LM4120AIM5-2.0 over temperature?
The LM4120AIM5-2.0 guarantees ±0.2% initial accuracy at 25°C and a temperature coefficient of 50 ppm/°C over −40°C to 125°C. Total output variation across −40°C to 85°C is typically ≤0.35%, calculated as initial error plus drift contribution - confirmed in TI's Electrical Characteristics table under "TCVOUT/°C" and "VOUT" parameters.
Can the LM4120AIM5-2.0 operate from a 2.2 V supply?
Yes - the LM4120AIM5-2.0 supports input voltages as low as 2.0 V. With a 2.048 V output and 120 mV typical dropout at 1 mA, a 2.2 V supply provides 152 mV headroom, well above the minimum required. Performance remains within datasheet specifications, including line regulation and load regulation, down to VIN = 2.0 V.
What is the purpose of the REF pin on the LM4120AIM5-2.0?
The REF pin on the LM4120AIM5-2.0 is an internal reference node that must remain unconnected in all applications. It is highly sensitive to noise and capacitive loading; connecting it to any trace, capacitor, or ground plane degrades output accuracy and stability. TI explicitly states "REF pin must be left unconnected" in the Pin Functions table and Layout Guidelines.
How does the enable function work on the LM4120AIM5-2.0?
The EN pin (Pin 3) controls device startup and shutdown. Pulling EN to VIN (≥2.4 V) enables normal operation; pulling EN to GND disables output and reduces supply current to <2 μA. The pin draws ~6 µA during turn-on and has minimal hysteresis - TI specifies logic-high threshold as 2.4 V and logic-low as 0.4 V, compatible with standard CMOS outputs.
Is the LM4120AIM5-2.0 suitable for driving a 10 kΩ load directly?
Yes - the LM4120AIM5-2.0 can drive a 10 kΩ load (205 µA at 2.048 V) with negligible error. Its ±5 mA output capability and 0.08%/mA load regulation ensure output deviation remains <170 µV (0.008% of 2.048 V), well within the ±0.2% initial accuracy spec. No external buffer is needed for such resistive loads.
LM4120AIM5-2.0 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):
- 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 FAQ
1.How can I place an order for LM4120AIM5-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5-2.0 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 LM4120AIM5-2.0 reliable?
The price and inventory of LM4120AIM5-2.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5-2.0 is usually 5 days.
3.What payment methods are accepted for LM4120AIM5-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5-2.0?
LM4120AIM5-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5-2.0 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 LM4120AIM5-2.0?
For technical support, including LM4120AIM5-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5-2.0 requirements.
6.How does Aetrix verify that LM4120AIM5-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5-2.0 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 LM4120AIM5-2.0 meets industry standards.
7.What is the process for return or replacement of LM4120AIM5-2.0?
All LM4120AIM5-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5-2.0, 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 LM4120AIM5-2.0 part is unused and in its original packaging.
Return procedure for LM4120AIM5-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120AIM5-2.0 Tags
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