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Texas Instruments LM4120AIM5-1.8/NOPB
- Part No.:
- LM4120AIM5-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,613
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Product details
Overview
LM4120AIM5-1.8/NOPB 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 - optimized for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4120AIM5-1.8/NOPB datasheet, LM4120AIM5-1.8/NOPB pinout, LM4120AIM5-1.8/NOPB application, or LM4120AIM5-1.8/NOPB equivalent, key selection criteria include industrial-grade (−40°C to 85°C) operation, SOT-23-5 package compatibility, power-down current <2 μA, and fixed 1.8 V output without external trimming.
Technical Context
The LM4120AIM5-1.8/NOPB implements a bandgap-based reference core with integrated enable logic and low-impedance output buffer. Its architecture supports operation from VIN = 2 V to 12 V while maintaining regulation down to VIN − VOUT = 120 mV (typical) at 1 mA - enabling use in ultra-low-voltage systems where input headroom is constrained.
Power management is handled via an analog enable pin requiring ≤0.4 V for shutdown and ≥2.4 V for activation, with <2 μA quiescent current in disable mode. The REF pin is internally connected and must remain unconnected externally to avoid noise coupling and output instability.
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 operation from 1.92 V supply - critical for single-cell Li-ion or coin-cell systems. |
| Supply Current | 160 μA typical supports >1-year battery life in 10-μA average-power IoT sensors. |
| Enable Thresholds | VIL ≤ 0.4 V, VIH ≥ 2.4 V - compatible with standard CMOS/TTL logic without level-shifting. |
| Output Drive | ±5 mA sink/source capability allows direct driving of op-amp inputs or small MOSFET gates. |
| Power-Down Current | <2 μA at VEN = 0.2 V enables aggressive duty-cycling in energy-harvesting applications. |
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 be left unconnected to prevent noise injection and output error. |
| 2 - GND | Ground return | Primary current return path for load, supply, and enable; requires low-impedance PCB connection. |
| 3 - EN | Enable control input | Analog input with hysteresis; pull to VIN for active mode, to GND for shutdown (<2 μA IQ). |
| 4 - VIN | Input supply | Accepts 2 V to 12 V; minimum 1.92 V required for 1.8 V output at 1 mA due to dropout. |
| 5 - VOUT | Regulated output | 1.8 V precision reference; capable of sourcing or sinking up to ±5 mA with <0.1% load regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 120 mV typical at 1 mA enables operation from near-output supply rails - essential for low-voltage portable systems. |
| Enable functionality | Logic-compatible analog enable pin reduces system standby power to sub-μA levels without external FETs. |
| High output accuracy | ±0.2% initial tolerance eliminates need for post-assembly trimming in precision measurement front-ends. |
| Wide input voltage range | 2 V to 12 V operation supports diverse power sources including single-cell batteries, DC-DC outputs, and wall adapters. |
| Stable with ceramic capacitors | Designed for 0.022–0.047 μF ceramic output caps - simplifies layout and avoids tantalum cost/size penalties. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor using 16-bit SAR ADC with 1.8 V reference rail. IC Role / Device Role / Timing Role: Precision 1.8 V voltage reference for ADC full-scale calibration and sensor signal conditioning. Use Value: ±0.2% initial accuracy and 50 ppm/°C TC ensure <0.01% measurement error across body temperature range (32–42°C). | Use Scenario: Environmental sensor node logging temperature/humidity every 5 minutes on CR2032 coin cell. IC Role / Device Role / Timing Role: Low-quiescent reference powering ADC and microcontroller VREF during active sampling bursts. Use Value: 160 μA operating current + <2 μA shutdown current extends battery life beyond 2 years at 10-second wake intervals. |
| Industrial Field Transmitters | Automotive Cabin Sensors |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating from 12 V loop supply. IC Role / Device Role / Timing Role: Stable 1.8 V reference for precision current-sense amplifier and DAC feedback path. Use Value: 120 mV dropout allows regulation from 1.92 V auxiliary rail derived from loop supply - maximizing headroom for sensing circuitry. | Use Scenario: Occupancy detection module in automotive HVAC control using MEMS accelerometer and low-power MCU. IC Role / Device Role / Timing Role: Enable-controlled reference supplying bias to analog front-end only during motion-triggered sampling. Use Value: EN pin logic thresholds (VIL ≤ 0.4 V, VIH ≥ 2.4 V) interface directly with MCU GPIO - eliminating level-shifters and reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6025AESA+ | 1.8 V, ±0.15% initial accuracy, 25 ppm/°C TC, 65 μA IQ, no enable pin | Lacks enable function; better TC but higher cost and no shutdown capability | Select when ultra-low drift dominates over power-gating requirements |
| ADR3418ARJZ-R7 | 1.8 V, ±0.1% initial accuracy, 10 ppm/°C TC, 120 μA IQ, no enable pin | Superior TC and accuracy but no enable; requires external switch for power cycling | Choose for metrology-grade stability where continuous operation is acceptable |
Compared with MAX6025AESA+ and ADR3418ARJZ-R7, the LM4120AIM5-1.8/NOPB uniquely combines enable control, industrial temperature range, and SOT-23-5 footprint - making it optimal for space-constrained, battery-aware designs requiring both precision and dynamic power management.
Availability
LM4120AIM5-1.8/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial field transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4120AIM5-1.8/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 and power management solutions.
The LM4120 series belongs to TI's precision voltage reference product line, engineered for low-power, high-accuracy applications in portable instrumentation, industrial sensing, and automotive subsystems where stability, small size, and enable control are critical.
FAQ
What is the maximum input voltage for LM4120AIM5-1.8/NOPB?
The absolute maximum input voltage for LM4120AIM5-1.8/NOPB is 14 V, but the recommended operating range is 2 V to 12 V. Exceeding 12 V may degrade long-term reliability or trigger internal protection mechanisms not specified in the datasheet. For sustained operation, VIN should remain within this 12 V limit to ensure parametric performance and thermal safety.
Does LM4120AIM5-1.8/NOPB require an external output capacitor?
Yes, LM4120AIM5-1.8/NOPB 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 ≤ 0.5 Ω. Larger values (up to 1 µF) are permissible but require tantalum construction above 0.047 µF, and may necessitate a 50-pF capacitor between VOUT and REF pins per TI application guidance.
Can the REF pin of LM4120AIM5-1.8/NOPB be connected to ground or bypassed?
No - the REF pin of LM4120AIM5-1.8/NOPB must remain unconnected in all configurations. It is an internal node sensitive to noise and capacitive loading; connecting it to ground, VOUT, or any capacitor will cause output inaccuracy, instability, or oscillation. TI explicitly states "REF pin must be left unconnected" in the Pin Functions table and Layout Guidelines.
What is the power-down current specification for LM4120AIM5-1.8/NOPB?
The power-down supply current for LM4120AIM5-1.8/NOPB is specified as ≤2 μA when the enable pin voltage is ≤0.2 V at −40°C to 85°C ambient. At 0.4 V enable voltage, ISS is ≤1 μA. This ultra-low shutdown current enables multi-year battery life in intermittently active sensor nodes where the LM4120AIM5-1.8/NOPB is gated by a microcontroller GPIO.
Is LM4120AIM5-1.8/NOPB suitable for automotive under-hood applications?
No - LM4120AIM5-1.8/NOPB is rated for −40°C to 85°C operation, which meets automotive cabin and infotainment requirements but not under-hood (−40°C to 125°C or 150°C) specifications. While its internal temperature coefficient is ensured to 125°C, the full electrical characteristics (e.g., dropout, load regulation) are only guaranteed over the industrial range. TI offers extended-range variants upon request, but LM4120AIM5-1.8/NOPB itself is not qualified for under-hood use.
LM4120AIM5-1.8/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):
- 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
LM4120AIM5-1.8/NOPB FAQ
1.How can I place an order for LM4120AIM5-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5-1.8/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 LM4120AIM5-1.8/NOPB reliable?
The price and inventory of LM4120AIM5-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120AIM5-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5-1.8/NOPB?
LM4120AIM5-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5-1.8/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 LM4120AIM5-1.8/NOPB?
For technical support, including LM4120AIM5-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5-1.8/NOPB requirements.
6.How does Aetrix verify that LM4120AIM5-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5-1.8/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 LM4120AIM5-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120AIM5-1.8/NOPB?
All LM4120AIM5-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5-1.8/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 LM4120AIM5-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4120AIM5-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120AIM5-1.8/NOPB Tags
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