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Texas Instruments LM4120IM5-2.0/NOPB
- Part No.:
- LM4120IM5-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,283
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Product details
Overview
LM4120IM5-2.0/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 2.048 V output with ±0.5% 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 LM4120IM5-2.0/NOPB datasheet, LM4120IM5-2.0/NOPB pinout, LM4120IM5-2.0/NOPB application, or LM4120IM5-2.0/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 2.048 V output matching common ADC/DAC reference requirements.
Technical Context
The LM4120IM5-2.0/NOPB implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling stable 2.048 V output across input voltages from 2.0 V to 12 V. Its enable pin controls analog startup/shutdown with logic-level thresholds (VH = 2.4 V, VL = 0.4 V) and <6 µA activation current.
Operation is validated over −40°C to 85°C ambient, with key parameters including 0.08%/mA load regulation (0–1 mA), 0.008%/V line regulation, and 36 µVPP (10 Hz–10 kHz) output noise - all specified with 0.01 µF ceramic output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V ±0.5% initial accuracy - matches standard 12-bit DAC/ADC full-scale reference points. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - ensures ≤±1.024 mV drift over full industrial range. |
| Dropout Voltage | 120 mV typical at 1 mA - enables operation from 2.15 V supply in ultra-low-voltage systems. |
| Supply Current | 160 µA typical - supports >1-year battery life in 10 µA sleep-mode sensor nodes. |
| Power-Down Current | <2 µA when EN = GND - reduces standby power by 80× vs active mode. |
| Output Drive | ±5 mA source/sink - directly drives 10 kΩ loads or 100 pF capacitive loads without buffer. |
| Noise (10 Hz–10 kHz) | 36 µVPP - contributes <0.001 LSB error in 16-bit 2.048 V full-scale systems. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant tin (Sn) lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Reference node | Must remain unconnected - sensitive to noise and capacitive loading; PCB isolation required. |
| GND | Ground reference | Return path for load current and internal bias; requires low-impedance connection to system ground plane. |
| EN | Enable control input | Analog input requiring ≥2.4 V for active mode; pulled to GND disables output and reduces current to <2 µA. |
| VIN | Input supply | Accepts 2.0 V to 12 V; minimum headroom = VOUT + dropout (120 mV @ 1 mA). |
| VOUT | Stable reference output | 2.048 V regulated output capable of sourcing/sinking ±5 mA; decoupling capacitor required at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 120 mV typical at 1 mA enables use with single-cell Li-ion (3.0 V min) or two-cell alkaline (2.4 V min) supplies. |
| Enable-Controlled Power-Down | Reduces quiescent current to <2 µA - critical for intermittent-sampling battery systems. |
| High Output Accuracy | ±0.5% initial tolerance meets Class 1 precision requirements for portable test equipment calibration. |
| Wide Input Range | 2.0 V to 12 V operation supports direct connection to unregulated battery rails or post-LDO supplies. |
| Low Noise Performance | 36 µVPP (10 Hz–10 kHz) minimizes quantization uncertainty in high-resolution data converters. |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld multimeter measuring DC voltage with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Precision 2.048 V reference for ADC full-scale calibration and offset nulling. Use Value: ±0.5% initial accuracy and 50 ppm/°C drift ensure <0.01% measurement error across −10°C to 50°C operating range. | Use Scenario: Remote environmental sensor node logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Reference for low-power ADC during active sampling; disabled between readings via EN pin. Use Value: 160 µA active current + <2 µA shutdown current extends CR2032 battery life beyond 2 years. |
| Industrial Process Monitoring | Medical Vital Sign Monitors |
Use Scenario: 4–20 mA transmitter module converting sensor output to current loop. IC Role / Device Role / Timing Role: Stable 2.048 V reference for DAC generating precise loop current setpoints. Use Value: 0.08%/mA load regulation maintains current accuracy despite varying loop impedance up to 1 kΩ. | Use Scenario: Portable ECG device acquiring biopotential signals with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Low-noise reference for ADC front-end, minimizing baseline wander and harmonic distortion. Use Value: 36 µVPP (10 Hz–10 kHz) noise contributes <0.0005% of full-scale, preserving diagnostic signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C20IDBZR | Shunt reference (2.048 V, ±0.5%, 100 ppm/°C); requires external bias resistor; no enable pin. | Higher quiescent current (60 µA min); unsuitable for low-dropout or power-gated designs. | Select when board space allows shunt topology and enable control is unnecessary. |
| REF3020AIDBZR | Series reference (2.048 V, ±0.2%, 50 ppm/°C); 165 µA supply current; no enable pin. | Lacks power-down mode; fixed 2.048 V output only; higher initial accuracy but same tempco. | Select when highest initial accuracy is required and continuous operation is acceptable. |
Compared with LM4120IM5-2.0/NOPB, LM4040C20IDBZR requires external biasing and lacks enable control, while REF3020AIDBZR offers tighter initial accuracy but no power-down capability - making LM4120IM5-2.0/NOPB optimal for battery-cycled, low-headroom applications demanding both precision and ultra-low standby power.
Availability
LM4120IM5-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process monitoring requiring stable component supply with guaranteed long-term availability.
Supply support for LM4120IM5-2.0/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 since 1930.
The LM4120 product line delivers micropower, low-dropout voltage references for portable and battery-constrained systems - designed specifically to replace larger, higher-quiescent-current references in space- and energy-sensitive applications.
FAQ
What is the output voltage tolerance of the LM4120IM5-2.0/NOPB over temperature?
The LM4120IM5-2.0/NOPB has ±0.5% initial accuracy at 25°C and a guaranteed temperature coefficient of 50 ppm/°C over −40°C to 125°C. Over the industrial range (−40°C to 85°C), total output variation remains within ±0.75% - calculated as initial error plus worst-case drift (50 ppm/°C × 125°C = ±0.625%). This ensures reliable performance in uncontrolled environments without recalibration.
Does the LM4120IM5-2.0/NOPB require an external output capacitor, and what value is recommended?
Yes, the LM4120IM5-2.0/NOPB requires a minimum 0.022 µF ceramic output capacitor for stability. The datasheet specifies stable operation with 0.022 µF to 0.047 µF ceramic capacitors (ESR 0.1–0.5 Ω). Larger values up to 1 µF are allowed using tantalum, but require a 50 pF capacitor between VOUT and REF pins. Omitting COUT risks oscillation and degraded noise performance in the LM4120IM5-2.0/NOPB.
Can the LM4120IM5-2.0/NOPB be used with input voltages below 2.1 V?
No - the LM4120IM5-2.0/NOPB requires a minimum input voltage of 2.0 V per datasheet specifications, but practical operation below 2.15 V (2.048 V + 120 mV dropout) risks loss of regulation under 1 mA load. At zero load, dropout drops to 65 mV typical, allowing marginal operation down to ~2.11 V, but this violates recommended conditions and degrades accuracy and noise. For sub-2.1 V systems, consider the LM4040 shunt reference instead of the LM4120IM5-2.0/NOPB.
What is the maximum load current the LM4120IM5-2.0/NOPB can drive while maintaining accuracy?
The LM4120IM5-2.0/NOPB is specified for ±5 mA source/sink capability. Load regulation is 0.08%/mA (0–1 mA) and 0.04%/mA (1–5 mA) over −40°C to 85°C. At 5 mA load, total output deviation is ≤±0.2% - within the ±0.5% initial tolerance band. Exceeding 5 mA risks thermal overload and output collapse; sustained loads above 3 mA require careful PCB thermal design due to 170.4°C/W junction-to-ambient resistance in the SOT-23-5 package.
How does the enable pin function on the LM4120IM5-2.0/NOPB, and what happens if left floating?
The enable pin on the LM4120IM5-2.0/NOPB is an analog input requiring ≥2.4 V for normal operation and ≤0.4 V to enter shutdown (<2 µA current). If left floating, the pin may assume indeterminate voltage due to leakage, causing unpredictable output behavior - including partial turn-on, oscillation, or excessive current draw. TI explicitly states floating is not recommended; unused enable pins must be tied to VIN for active mode or GND for shutdown. This requirement applies strictly to the LM4120IM5-2.0/NOPB and all variants in the family.
LM4120IM5-2.0/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):
- 2.048V
- 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
LM4120IM5-2.0/NOPB FAQ
1.How can I place an order for LM4120IM5-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5-2.0/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 LM4120IM5-2.0/NOPB reliable?
The price and inventory of LM4120IM5-2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5-2.0/NOPB?
LM4120IM5-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5-2.0/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 LM4120IM5-2.0/NOPB?
For technical support, including LM4120IM5-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5-2.0/NOPB requirements.
6.How does Aetrix verify that LM4120IM5-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5-2.0/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 LM4120IM5-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5-2.0/NOPB?
All LM4120IM5-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5-2.0/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 LM4120IM5-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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