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Texas Instruments LM4120AIM5-3.3/NOPB
- Part No.:
- LM4120AIM5-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,977
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Product details
Overview
LM4120AIM5-3.3/NOPB 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 160 µA typical supply current - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4120AIM5-3.3/NOPB datasheet, LM4120AIM5-3.3/NOPB pinout, LM4120AIM5-3.3/NOPB application, or LM4120AIM5-3.3/NOPB equivalent, key selection criteria include industrial-grade temperature stability (−40°C to 85°C), power-down current <2 µA, SOT-23-5 package compatibility, and fixed-output voltage precision under low-input-voltage conditions (as low as 3.42 V).
Technical Context
The LM4120AIM5-3.3/NOPB implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling stable 3.3 V output across input voltages from 3.42 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.
Operation is specified over −40°C to 85°C with guaranteed 50 ppm/°C tempco and ≤0.17%/mA load regulation (0–1 mA). The REF pin is internally connected and must remain unconnected externally to avoid noise coupling or capacitive loading effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±0.2% initial accuracy - ensures system ADC/DAC reference integrity without calibration in most industrial designs. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - limits full-range drift to ±16.5 mV, critical for precision sensor front-ends. |
| Dropout Voltage | 120 mV typical at 1 mA - enables operation from 3.42 V input, supporting single-cell Li-ion or regulated 3.6 V rails. |
| Supply Current | 160 µA typical - extends battery life in always-on monitoring nodes; drops to <2 µA in power-down mode. |
| Output Drive | ±5 mA source/sink - directly drives ADC reference inputs, op-amp bias networks, or small DACs without external buffers. |
| Enable Thresholds | VH = 2.4 V, VL = 0.4 V - compatible with standard CMOS/TTL logic for microcontroller-controlled power sequencing. |
| Output Noise | 36 µVPP (10 Hz–10 kHz) - suitable for 16-bit+ data converters where reference noise dominates SNR. |
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 |
|---|---|---|
| REF | Reference node | Internally connected; must be left unconnected on PCB to prevent noise injection and instability. |
| GND | Ground reference | Primary return path for load current and supply current; requires low-impedance connection to system ground plane. |
| Enable | Digital control input | Active-high logic input; pulling to VIN enables output, pulling to GND disables output and reduces supply current to <2 µA. |
| VIN | Positive supply input | Accepts 3.42 V to 12 V; minimum input = VOUT + dropout (120 mV typ.) for regulation. |
| VOUT | Stable 3.3 V output | Provides precision reference for ADCs, DACs, or comparators; capable of sourcing/sinking up to ±5 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout operation | 120 mV typical at 1 mA enables use with tightly regulated or battery-depleted supplies. |
| Enable-controlled shutdown | Reduces quiescent current to <2 µA - essential for ultra-low-power wake-on-event architectures. |
| High initial accuracy | ±0.2% (A-grade) eliminates need for post-assembly trimming in cost-sensitive production test flows. |
| Wide input voltage range | Operates from 3.42 V to 12 V - supports both low-voltage portable and industrial 12 V rail applications. |
| Low output noise | 36 µVPP (10 Hz–10 kHz) maintains signal integrity in high-resolution measurement systems. |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC requiring stable reference under varying battery voltage (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion, directly setting full-scale range. Use Value: 120 mV dropout allows regulation down to 3.42 V input, extending usable battery life by >15% versus higher-dropout references. | Use Scenario: Remote environmental sensor node powered by coin cell, sampling temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Reference source for low-power ADC and analog front-end during active measurement bursts. Use Value: 160 µA operating current and <2 µA shutdown current minimize average system power, enabling multi-year operation. |
| Industrial Process Monitoring | Medical Vital Sign Monitors |
Use Scenario: 4–20 mA loop-powered transmitter with onboard 12-bit DAC and sensor signal conditioning. IC Role / Device Role / Timing Role: Precision reference for DAC output scaling and sensor excitation current generation. Use Value: ±0.2% accuracy and 50 ppm/°C tempco ensure <0.5% total error over −40°C to 85°C ambient, meeting IEC 61000-6-2 immunity requirements. | Use Scenario: Portable ECG module requiring stable 3.3 V reference for analog front-end amplifiers and 16-bit ADC. IC Role / Device Role / Timing Role: Low-noise voltage reference establishing DC bias and gain accuracy for biopotential signal chain. Use Value: 36 µVPP broadband noise contributes <0.01% error to 5 mV ECG signal, preserving diagnostic fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA33+ | 3.3 V, ±0.1% initial accuracy, 3 ppm/°C tempco, 0.9 µA supply current, SO-8 package | Higher precision and lower drift, but larger footprint and no enable pin | Select when ultra-stability outweighs board space and power-down capability |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1% initial accuracy, 10 ppm/°C tempco, 120 µA supply current, SOT-23-5 package | Lower tempco and supply current, but no enable function and tighter input voltage range (3.6–15 V) | Select when lowest possible drift and quiescent current are required, and enable control is unnecessary |
Compared with MAX6126AASA33+ and ADR3433ARJZ-R7, the LM4120AIM5-3.3/NOPB offers unique integration of enable control, SOT-23-5 footprint, and 120 mV dropout in a cost-optimized A-grade reference - making it optimal for space-constrained, battery-aware industrial sensors where moderate precision suffices.
Availability
LM4120AIM5-3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process monitoring requiring stable component supply with consistent parametric performance and long-term traceability.
Supply support for LM4120AIM5-3.3/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 broad industrial portfolio coverage.
The LM4120 series belongs to TI's precision voltage reference product line, designed specifically for low-power, high-accuracy applications in portable, battery-operated, and industrial measurement systems where size, efficiency, and stability are critical.
FAQ
What is the minimum input voltage required for LM4120AIM5-3.3/NOPB to maintain regulation?
The LM4120AIM5-3.3/NOPB requires a minimum input voltage of VOUT + dropout = 3.3 V + 120 mV = 3.42 V (typical) to maintain regulation at 1 mA load. At higher loads or temperature extremes, dropout increases to 180 mV (max), so design margin should assume ≥3.48 V minimum input for robust operation across conditions.
Does LM4120AIM5-3.3/NOPB require an external output capacitor, and if so, what value?
Yes, the LM4120AIM5-3.3/NOPB requires a minimum 0.022 µF ceramic output capacitor for stability. Values up to 0.047 µF ceramic are recommended; larger values (up to 1 µF) require tantalum construction and a 50-pF capacitor between VOUT and REF pins. Ceramic capacitors outside the 0.022–0.047 µF range may cause oscillation due to ESR sensitivity.
Can the REF pin of LM4120AIM5-3.3/NOPB be connected to ground or bypassed?
No - the REF pin of LM4120AIM5-3.3/NOPB must remain unconnected (floating) in all applications. It is an internal node sensitive to noise and capacitive loading; connecting it to ground, VOUT, or any capacitor will degrade accuracy, increase noise, and potentially destabilize the reference output.
What is the power-down current of LM4120AIM5-3.3/NOPB, and how is it activated?
The LM4120AIM5-3.3/NOPB draws <2 µA in power-down mode when the Enable pin is pulled to GND (logic low). Activation occurs when Enable rises above 2.4 V (min), drawing ~6 µA to start up the reference. Floating the Enable pin is not recommended - it must be actively driven to VIN for normal operation or to GND for shutdown.
Is LM4120AIM5-3.3/NOPB suitable for automotive applications?
The LM4120AIM5-3.3/NOPB is rated for −40°C to 85°C operation and meets industrial specifications, but it is not AEC-Q200 qualified. For automotive applications requiring qualification, TI recommends alternatives such as the TLV431B-Q1 or REF5033-Q1; LM4120AIM5-3.3/NOPB may be used in non-safety-critical aftermarket or infotainment subsystems with customer validation.
LM4120AIM5-3.3/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):
- 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
LM4120AIM5-3.3/NOPB FAQ
1.How can I place an order for LM4120AIM5-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5-3.3/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 LM4120AIM5-3.3/NOPB reliable?
The price and inventory of LM4120AIM5-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120AIM5-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5-3.3/NOPB?
LM4120AIM5-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5-3.3/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 LM4120AIM5-3.3/NOPB?
For technical support, including LM4120AIM5-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5-3.3/NOPB requirements.
6.How does Aetrix verify that LM4120AIM5-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5-3.3/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 LM4120AIM5-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120AIM5-3.3/NOPB?
All LM4120AIM5-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5-3.3/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 LM4120AIM5-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4120AIM5-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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