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Texas Instruments LM4120AIM5X-3.3
- Part No.:
- LM4120AIM5X-3.3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5X-3.3.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,321
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Product details
Overview
LM4120AIM5X-3.3 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 3.3 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 operates from 2 V to 12 V input across −40°C to 85°C - used in portable instrumentation, battery-powered data acquisition, and precision regulators where stable low-power biasing is critical.
For engineers reviewing the LM4120AIM5X-3.3 datasheet, LM4120AIM5X-3.3 pinout, LM4120AIM5X-3.3 application, or LM4120AIM5X-3.3 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated SOT-23-5 pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The LM4120AIM5X-3.3 implements a bandgap-based reference core with integrated enable logic and low-impedance output buffer. Its architecture supports operation down to 2 V input while maintaining regulation under 120 mV headroom at 1 mA, enabling use in single-cell Li-ion or multi-cell alkaline systems.
It delivers 3.3 V output with 0.2% initial tolerance (A-grade), 50 ppm/°C tempco over −40°C to 125°C, and 160 µA typical quiescent current - dropping below 2 µA in power-down mode via the enable pin. The REF pin is internally connected and must remain unconnected externally to avoid noise coupling or instability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±0.2% (A-grade) - ensures ADC/DAC reference accuracy within 6.6 mV at room temperature |
| Temperature Coefficient | 50 ppm/°C - contributes ≤1.65 mV drift over −40°C to +85°C ambient range |
| Dropout Voltage | 120 mV typical at 1 mA - allows regulation from 3.42 V input, supporting ultra-low-headroom battery systems |
| Supply Current | 160 µA typical - enables >1-year runtime on a 220 mAh coin cell at 1 mA load cycling |
| Enable Threshold | VH = 2.4 V, VL = 0.4 V - compatible with standard CMOS/TTL logic without level shifting |
| Output Drive | ±5 mA - sufficient to directly drive SAR ADC reference inputs or op-amp bias networks |
| Noise (0.1–10 Hz) | 20 µVPP - supports 16-bit+ precision in low-frequency measurement front-ends |
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 remain unconnected externally to prevent noise injection and output instability |
| 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 requiring ≥2.4 V for active mode; pulled to GND disables output and reduces current to <2 µA |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; minimum 3.42 V required for 3.3 V output at 1 mA due to 120 mV dropout |
| 5 - VOUT | Regulated reference output | 3.3 V ±0.2%, capable of sourcing or sinking up to ±5 mA into capacitive or resistive loads |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 120 mV typical at 1 mA enables use with single-cell Li-ion (3.0–3.6 V) or 3× alkaline (3.6–4.5 V) supplies |
| Enable-Controlled Power-Down | Reduces supply current to <2 µA - extends battery life in intermittent-sampling systems like IoT sensors |
| High Output Accuracy | ±0.2% initial tolerance (A-grade) eliminates need for post-production trimming in production test fixtures |
| Low Temperature Drift | 50 ppm/°C max over −40°C to +125°C ensures <±0.17% output variation across full industrial range |
| Source/Sink Capability | ±5 mA output drive supports direct interfacing to ADC reference pins, op-amp feedback networks, and DAC buffers |
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 internal LDO biasing. Use Value: 0.2% initial accuracy and 50 ppm/°C tempco maintain measurement linearity across temperature without calibration. |
Use Scenario: Wireless sensor node logging temperature/humidity with 12-bit ADC and BLE radio. IC Role / Device Role / Timing Role: Stable reference for analog signal conditioning and ADC reference during active sampling bursts. Use Value: 160 µA quiescent current and enable-controlled shutdown extend coin-cell lifetime beyond 2 years. |
| Precision Regulator Feedback | Medical Diagnostic Equipment |
Use Scenario: Low-noise LDO regulator for analog front-end powering EEG amplifiers. IC Role / Device Role / Timing Role: Reference input to error amplifier in high-PSRR linear regulator loop. Use Value: 20 µVPP (0.1–10 Hz) noise minimizes baseline drift in sub-µV biomedical signal paths. |
Use Scenario: Portable blood glucose meter with electrochemical sensor interface and LCD display. IC Role / Device Role / Timing Role: Calibration reference for sensor excitation and ADC full-scale setting. Use Value: ±0.2% accuracy ensures consistent glucose concentration reporting across manufacturing lot and temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3033AIDBVR | 3.3 V, ±0.2%, 50 ppm/°C, 50 µA IQ, no enable pin, SOT-23-5 | Lacks enable control; lower quiescent current but no power-down mode | Preferred when ultra-low IQ is critical and enable functionality is unnecessary |
| MAX6033AESA33+ | 3.3 V, ±0.15%, 20 ppm/°C, 65 µA IQ, no enable, SO-8 | Higher accuracy and lower tempco, but larger SO-8 package and no enable | Selected for metrology-grade stability where board space permits SO-8 and enable is unused |
Compared with LM4120AIM5X-3.3, REF3033AIDBVR offers lower quiescent current but forfeits enable control, while MAX6033AESA33+ delivers superior accuracy and tempco in a larger package - making LM4120AIM5X-3.3 optimal for compact, enable-driven, battery-constrained designs requiring A-grade precision.
Availability
LM4120AIM5X-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and precision regulators requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4120AIM5X-3.3 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 broad industrial portfolio coverage.
The LM4120 series was designed for low-power, high-accuracy voltage referencing in space- and energy-constrained systems - targeting portable, automotive, and industrial applications demanding grade-A initial tolerance and robust thermal performance.
FAQ
What is the maximum input voltage for LM4120AIM5X-3.3?
The absolute maximum input voltage for LM4120AIM5X-3.3 is 14 V, but the recommended operating range is 2 V to 12 V. Exceeding 12 V may degrade long-term reliability or trigger overvoltage stress not covered by specifications. For sustained operation, keep VIN ≤12 V per the Recommended Operating Conditions table in the datasheet.
Does LM4120AIM5X-3.3 require an external output capacitor?
Yes - LM4120AIM5X-3.3 requires a minimum 0.022 µF ceramic output capacitor for stability, with optimal range 0.022 µF to 0.047 µF. Larger values (up to 1 µF) are allowed only with tantalum dielectrics and require a 50-pF capacitor between VOUT and REF. Omitting COUT risks oscillation or poor transient response.
Can the REF pin of LM4120AIM5X-3.3 be left floating or tied to ground?
No - the REF pin of LM4120AIM5X-3.3 must remain unconnected (open). It is internally connected to the bandgap core and highly sensitive to noise and capacitive loading. Connecting it to ground, VOUT, or any other node will cause output inaccuracy, instability, or increased noise - as explicitly stated in the Functional Description section.
What is the power-down current of LM4120AIM5X-3.3 when EN is grounded?
When the EN pin is pulled to GND, LM4120AIM5X-3.3 enters power-down mode with supply current ≤2 µA over −40°C to +85°C. At 25°C, typical shutdown current is 1 µA. This value is specified in the Electrical Characteristics table under "ISS Power-down supply current" with test condition "Enable = 0.2 V".
Is LM4120AIM5X-3.3 suitable for automotive applications?
LM4120AIM5X-3.3 is rated for −40°C to +85°C industrial operation and is not AEC-Q200 qualified. While its temperature range overlaps with some automotive cabin applications, TI does not specify or guarantee performance for automotive use. For automotive-grade alternatives, consult TI's automotive-qualified voltage references such as the REF5033-EP series.
LM4120AIM5X-3.3 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):
- 3.3V
- 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-3.3 FAQ
1.How can I place an order for LM4120AIM5X-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5X-3.3 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-3.3 reliable?
The price and inventory of LM4120AIM5X-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5X-3.3 is usually 5 days.
3.What payment methods are accepted for LM4120AIM5X-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5X-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5X-3.3?
LM4120AIM5X-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5X-3.3 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-3.3?
For technical support, including LM4120AIM5X-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5X-3.3 requirements.
6.How does Aetrix verify that LM4120AIM5X-3.3 is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5X-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LM4120AIM5X-3.3?
All LM4120AIM5X-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5X-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LM4120AIM5X-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120AIM5X-3.3 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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AZ431LBNTR-G1
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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