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Texas Instruments LM4120IM5X-1.8/NOPB
- Part No.:
- LM4120IM5X-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,489
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Product details
Overview
LM4120IM5X-1.8/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 1.8 V output with ±0.5% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load - used as a stable reference in portable instrumentation, battery-powered data acquisition, and precision regulators.
For engineers reviewing the LM4120IM5X-1.8/NOPB datasheet, LM4120IM5X-1.8/NOPB pinout, LM4120IM5X-1.8/NOPB application, or LM4120IM5X-1.8/NOPB equivalent, key selection criteria include enable-controlled power-down (ISS < 2 µA), ±5 mA source/sink capability, SOT-23-5 package compatibility, and industrial temperature range (−40°C to 85°C) operation.
Technical Context
The LM4120IM5X-1.8/NOPB implements a bandgap-based reference core with integrated enable control logic and low-impedance output buffer. It operates from 2 V to 12 V input while maintaining regulation down to VIN − VOUT = 120 mV (typ.) at 1 mA, enabling use in ultra-low-voltage systems where headroom is constrained.
Its enable pin accepts standard CMOS/TTL logic levels (VH ≥ 2.4 V, VL ≤ 0.4 V), draws only 6 µA typical during startup, and forces output shutdown when pulled to GND - reducing supply current to < 2 µA. 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, ±0.5% initial accuracy over −40°C to 85°C - ensures stable ADC/DAC biasing without trimming. |
| Dropout Voltage | 120 mV typical at 1 mA load - supports operation from single-cell Li-ion (3.0 V min) or 2×AA (3.2 V) supplies. |
| Supply Current | 160 µA typical - enables multi-year battery life in always-on sensor nodes and portable meters. |
| Power-Down Current | < 2 µA when EN = GND - critical for duty-cycled systems requiring microamp-level sleep states. |
| Tempco | 50 ppm/°C (−40°C to 125°C) - maintains ≤0.9 mV drift across full industrial range, suitable for 12-bit+ precision. |
| Load Drive | ±5 mA source/sink - directly drives op-amp inputs, SAR ADC references, or small logic loads without buffering. |
| Noise (0.1–10 Hz) | 20 µVPP - low enough for high-resolution 16-bit data acquisition without external filtering. |
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 - floating connection prevents noise injection and capacitive loading errors. |
| 2: GND | Ground reference | Primary return path for load current and internal bias; requires low-impedance PCB connection to minimize ground bounce. |
| 3: EN | Enable control input | Analog input with ~6 µA startup current; pulled to VIN for active mode, grounded for shutdown - no pull-up required. |
| 4: VIN | Positive supply input | Accepts 2 V to 12 V; minimum headroom defined by dropout voltage - decoupling capacitor recommended for transient immunity. |
| 5: VOUT | Regulated reference output | 1.8 V precision output capable of sourcing/sinking ±5 mA; requires 0.022 µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces quiescent current to < 2 µA - extends battery life in intermittent-sampling applications like IoT sensors. |
| Low dropout (120 mV @ 1 mA) | Enables direct regulation from single-cell batteries without intermediate LDO - simplifies power architecture. |
| ±5 mA output drive | Eliminates need for external buffer op-amps in most 12–16-bit data converter reference designs. |
| 50 ppm/°C tempco | Ensures ≤0.9 mV output shift over −40°C to 85°C - meets accuracy requirements for industrial process controllers. |
| Stable with 0.022 µF ceramic COUT | Reduces BOM count and board space vs. references requiring tantalum or larger ceramics for stability. |
Applications
| Portable Instrumentation | Battery-Powered Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and analog front-end calibration. Use Value: 1.8 V output matches low-voltage ADC reference input; ±0.5% accuracy and 50 ppm/°C tempco ensure <0.1% measurement error across operating temperature. |
Use Scenario: Wireless environmental sensor node logging temperature/humidity at 1-minute intervals. IC Role / Device Role / Timing Role: Reference for precision analog signal conditioning and ADC before deep-sleep cycles. Use Value: Enable pin allows full shutdown between samples, reducing average current to sub-µA level - enabling 5+ year CR2032 battery life. |
| Precision Regulators | Medical Monitoring Devices |
|
Use Scenario: Low-noise 1.8 V supply for RF transceiver biasing in portable diagnostic equipment. IC Role / Device Role / Timing Role: Reference input to adjustable LDO feedback network, setting precise output voltage. Use Value: 20 µVPP low-frequency noise prevents modulation artifacts in sensitive RF stages; ±5 mA drive handles LDO feedback current demands. |
Use Scenario: Portable ECG monitor requiring stable 1.8 V reference for analog front-end amplifiers and ADC. IC Role / Device Role / Timing Role: High-stability reference ensuring consistent gain and offset calibration across patient measurements. Use Value: Thermal hysteresis < 0.5 mV/V and long-term stability of 100 ppm/1000 hrs maintain clinical-grade accuracy without field recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4120AIM5X-1.8/NOPB | ±0.2% initial accuracy (vs. ±0.5%), same tempco, package, and enable functionality. | Required for 14-bit+ systems where initial tolerance dominates total error budget. | Select when higher initial accuracy justifies cost premium; otherwise LM4120IM5X-1.8/NOPB suffices for 12-bit applications. |
| REF3018AIDBVR | 1.8 V, ±0.2% accuracy, 50 ppm/°C, but no enable pin; 120 µA supply current; SOT-23-5. | Lacks power-down capability - unsuitable for battery-cycled systems needing µA sleep current. | Choose only if enable function is unnecessary and tighter initial accuracy is mandatory; verify layout for REF pin isolation. |
Compared with LM4120AIM5X-1.8/NOPB, the LM4120IM5X-1.8/NOPB trades 0.3% initial accuracy for lower cost while retaining identical thermal, dropout, and enable performance; versus REF3018AIDBVR, it adds critical enable control at modest supply current increase - making it uniquely suited for energy-constrained portable instrumentation.
Availability
LM4120IM5X-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and precision regulators requiring stable component supply across extended production lifecycles.
Supply support for LM4120IM5X-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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision reference design.
The LM4120 series was developed for micropower, low-dropout voltage reference applications in portable and industrial systems - emphasizing accuracy, thermal stability, and enable-controlled power efficiency in compact SOT-23 packages.
FAQ
What is the maximum input voltage for LM4120IM5X-1.8/NOPB?
The absolute maximum input voltage for LM4120IM5X-1.8/NOPB is 14 V, but recommended operating range is 2 V to 12 V. Exceeding 12 V risks violating safe operating area limits and may degrade long-term reliability - TI specifies 12 V as the upper bound for guaranteed performance across temperature.
Does LM4120IM5X-1.8/NOPB require an external output capacitor?
Yes, LM4120IM5X-1.8/NOPB requires a minimum 0.022 µF ceramic output capacitor for loop stability. Values up to 1 µF improve transient response, but >0.047 µF must be tantalum with a 50-pF capacitor between VOUT and REF - omitting COUT risks oscillation and inaccurate regulation.
Can the REF pin of LM4120IM5X-1.8/NOPB be connected to ground or bypassed?
No - the REF pin of LM4120IM5X-1.8/NOPB must remain unconnected in all cases. It is internally connected and highly sensitive to noise and capacitive loading; grounding or bypassing it introduces instability, increased noise, and output voltage errors per TI's layout guidelines.
What is the typical startup time for LM4120IM5X-1.8/NOPB after enabling?
The typical startup time for LM4120IM5X-1.8/NOPB is 20 µs from EN rising to valid VOUT regulation, as shown in Figure 14 of the datasheet. This fast turn-on supports high-speed sampling systems where reference settling must align precisely with ADC conversion windows.
Is LM4120IM5X-1.8/NOPB qualified for automotive applications?
No - LM4120IM5X-1.8/NOPB is specified for industrial temperature range (−40°C to 85°C) only. For automotive AEC-Q100 qualification, TI offers the LM4120-Q1 variant; this part lacks automotive stress testing, qualification reports, and extended temperature validation beyond 85°C ambient.
LM4120IM5X-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:
- ±0.5%
- 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
LM4120IM5X-1.8/NOPB FAQ
1.How can I place an order for LM4120IM5X-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-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 LM4120IM5X-1.8/NOPB reliable?
The price and inventory of LM4120IM5X-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 LM4120IM5X-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-1.8/NOPB?
LM4120IM5X-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-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 LM4120IM5X-1.8/NOPB?
For technical support, including LM4120IM5X-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-1.8/NOPB requirements.
6.How does Aetrix verify that LM4120IM5X-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-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 LM4120IM5X-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-1.8/NOPB?
All LM4120IM5X-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-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 LM4120IM5X-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5X-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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