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Texas Instruments LM4120AIM5X-1.8
- Part No.:
- LM4120AIM5X-1.8
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5X-1.8.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,008
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Product details
Overview
LM4120AIM5X-1.8 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 1.8 V output with ±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 - designed for high-accuracy analog sensing and regulation in space-constrained battery-powered systems.
For engineers reviewing the LM4120AIM5X-1.8 datasheet, LM4120AIM5X-1.8 pinout, LM4120AIM5X-1.8 application, or LM4120AIM5X-1.8 equivalent, key selection criteria include industrial-grade temperature stability (−40°C to 85°C), SOT-23-5 package compatibility, power-down current <2 µA, and fixed 1.8 V output without external trimming.
Technical Context
The LM4120AIM5X-1.8 implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling low-noise (36 µVPP, 10 Hz–10 kHz), low-drift performance across its full operating range. Its enable input accepts standard CMOS/TTL logic levels and controls a shutdown mode reducing supply current to ≤2 µA.
Input voltage range spans 2 V to 12 V, supporting operation down to 1.92 V (1.8 V + 120 mV dropout) - critical for single-cell Li-ion or coin-cell applications. The REF pin is internally connected and must remain unconnected externally to avoid noise coupling or capacitive loading errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V fixed, ±0.2% initial accuracy ensures stable ADC/DAC reference without calibration. |
| Temperature Coefficient | 50 ppm/°C over −40°C to 125°C guarantees ≤0.9 mV drift across full industrial range. |
| Dropout Voltage | 120 mV typical at 1 mA enables use with ultra-low headroom supplies like 2.0 V rails. |
| Supply Current | 160 µA typical supports multi-year battery life in always-on sensor nodes. |
| Enable Thresholds | VIL ≤ 0.4 V, VIH ≥ 2.4 V - compatible with 3.3 V and 5 V logic families. |
| Output Drive | ±5 mA sink/source allows direct driving of op-amp inputs or small loads without buffering. |
| Output Noise | 36 µVPP (10 Hz–10 kHz) minimizes quantization error in 16-bit+ data acquisition. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, tape-and-reel (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Internally connected; must be left unconnected to prevent noise injection or instability. |
| 2 - GND | Ground reference | Return path for load current and internal bias; requires low-impedance PCB connection. |
| 3 - EN | Enable control input | Active-high logic input; pull to VIN for normal operation, ground for shutdown (<2 µA ISS). |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; minimum 1.92 V required for 1 mA load at 1.8 V output. |
| 5 - VOUT | Regulated reference output | Delivers stable 1.8 V ±0.2% with ±5 mA drive; requires 0.022 µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 120 mV typical at 1 mA enables operation from single 2.0 V cells or low-voltage LDO outputs. |
| Enable-controlled shutdown | Reduces supply current to ≤2 µA - essential for duty-cycled IoT sensors and portable instrumentation. |
| High output accuracy | ±0.2% initial tolerance eliminates need for system-level trimming in precision measurement front-ends. |
| Low temperature drift | 50 ppm/°C max ensures <±0.75 mV variation over −40°C to +85°C ambient - suitable for automotive cabin modules. |
| Source/sink capability | ±5 mA output drive supports direct interfacing with SAR ADC references, op-amp bias networks, and DAC buffers. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with 16-bit ADC sampling analog transducer output. IC Role / Device Role / Timing Role: Precision 1.8 V reference for ADC voltage scaling and sensor excitation. Use Value: ±0.2% accuracy and 50 ppm/°C drift maintain sub-0.1% measurement linearity across body temperature range. |
Use Scenario: Environmental sensor node logging temperature/humidity every 10 seconds using coin-cell battery. IC Role / Device Role / Timing Role: Low-power reference for microcontroller ADC and analog front-end conditioning. Use Value: 160 µA supply current and enable-controlled shutdown extend battery life beyond 5 years. |
| Industrial Process Transmitters | Automotive Cabin Control Modules |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in −40°C to +85°C enclosures. IC Role / Device Role / Timing Role: Stable 1.8 V reference for signal conditioning and digital isolation supply regulation. Use Value: Guaranteed 50 ppm/°C drift and −40°C to +85°C operation ensure consistent 0.1% FS accuracy across temperature extremes. |
Use Scenario: HVAC control unit with touch interface and ambient light sensing in vehicle dashboard. IC Role / Device Role / Timing Role: Reference for microcontroller ADC measuring thermistor and photodiode signals. Use Value: SOT-23-5 footprint and 120 mV dropout allow direct use from 2.5 V buck converter output, minimizing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6029AEUR+T | 1.8 V, ±0.1% initial accuracy, 30 ppm/°C, 125 µA supply current, SC70-5 package | Higher accuracy and lower drift but no enable pin; requires external logic for shutdown | Select when absolute lowest drift is prioritized and enable control is not required. |
| ADR3418ARJZ-R7 | 1.8 V, ±0.1% initial accuracy, 10 ppm/°C, 120 µA supply current, SOT-23-5 package | Superior temperature stability and lower noise (12 µVPP), but no enable function and higher cost | Select for metrology-grade applications where long-term stability outweighs power-down capability. |
Compared with MAX6029AEUR+T and ADR3418ARJZ-R7, the LM4120AIM5X-1.8 uniquely combines enable control, ultra-low dropout, and industrial temperature grade in a cost-optimized SOT-23-5 package - making it optimal for battery-constrained systems requiring active power management.
Availability
LM4120AIM5X-1.8 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial process transmitters requiring stable component supply with guaranteed long-term availability.
Supply support for LM4120AIM5X-1.8 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 specifically for micropower, low-dropout voltage reference applications in portable, battery-operated, and space-constrained industrial systems - emphasizing accuracy, thermal stability, and ease of integration.
FAQ
What is the maximum load current supported by the LM4120AIM5X-1.8 while maintaining specified accuracy?
The LM4120AIM5X-1.8 supports ±5 mA source/sink current with guaranteed load regulation of ≤0.04%/mA (0–1 mA) and ≤0.1%/mA (1–5 mA). At 5 mA load, output voltage deviation remains within ±0.5% of nominal 1.8 V under industrial temperature conditions, preserving accuracy for buffered ADC references and op-amp biasing circuits.
Does the LM4120AIM5X-1.8 require an external output capacitor, and if so, what value is recommended?
Yes - the LM4120AIM5X-1.8 requires a minimum 0.022 µF ceramic output capacitor for loop stability. Recommended values range from 0.022 µF to 0.047 µF for general use; larger values up to 1 µF (tantalum only) improve transient response but require additional layout care per TI's Application Note SNVS049F Section 8.2.2.2.
How does the enable pin of the LM4120AIM5X-1.8 behave during power-up and shutdown sequences?
The LM4120AIM5X-1.8 enable pin requires ≥2.4 V for normal operation and ≤0.4 V for shutdown. During power-up, the device starts within 100 µs after EN reaches valid high level; during shutdown, output disables within 10 µs after EN drops below 0.4 V. A minimum slew rate of 0.003 V/µs on EN prevents output glitches.
Can the LM4120AIM5X-1.8 operate from a 2.0 V supply, and what is the resulting dropout margin?
Yes - the LM4120AIM5X-1.8 operates with input voltages as low as 2.0 V. With 1.8 V output and 120 mV typical dropout, it maintains regulation with 200 mV headroom at 1 mA load. At 2.0 V input, output remains within ±0.2% specification across −40°C to +85°C, confirmed in Electrical Characteristics Table 6.5.
What is the purpose of the REF pin on the LM4120AIM5X-1.8, and how should it be handled on the PCB?
The REF pin on the LM4120AIM5X-1.8 is an internal bandgap node and must remain unconnected in all applications. TI explicitly states that connecting or capacitively loading this pin introduces noise sensitivity and potential instability. PCB layout must isolate REF with guard traces and avoid routing nearby signals or power planes.
LM4120AIM5X-1.8 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):
- 1.8V
- 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
LM4120AIM5X-1.8 FAQ
1.How can I place an order for LM4120AIM5X-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5X-1.8 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 LM4120AIM5X-1.8 reliable?
The price and inventory of LM4120AIM5X-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5X-1.8 is usually 5 days.
3.What payment methods are accepted for LM4120AIM5X-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5X-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5X-1.8?
LM4120AIM5X-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5X-1.8 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 LM4120AIM5X-1.8?
For technical support, including LM4120AIM5X-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5X-1.8 requirements.
6.How does Aetrix verify that LM4120AIM5X-1.8 is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5X-1.8 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 LM4120AIM5X-1.8 meets industry standards.
7.What is the process for return or replacement of LM4120AIM5X-1.8?
All LM4120AIM5X-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5X-1.8, 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 LM4120AIM5X-1.8 part is unused and in its original packaging.
Return procedure for LM4120AIM5X-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120AIM5X-1.8 Tags
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