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Texas Instruments LM4120IM5-4.1/NOPB
- Part No.:
- LM4120IM5-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,109
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Product details
Overview
LM4120IM5-4.1/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 4.096 V output with ±0.5% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load - designed for high-accuracy analog signal chains in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4120IM5-4.1/NOPB datasheet, LM4120IM5-4.1/NOPB pinout, LM4120IM5-4.1/NOPB application, or LM4120IM5-4.1/NOPB equivalent, this page delivers verified specifications, SOT-23-5 pin mapping, real-world use cases, and validated alternative options for stable, low-power reference design.
Technical Context
The LM4120IM5-4.1/NOPB implements a bandgap-based reference core with integrated enable control and rail-to-rail sink/source capability (±5 mA). Its architecture supports operation from 2 V to 12 V input while maintaining regulation down to VIN = VOUT + 120 mV (typical) at full load.
It features a dedicated REF pin (unconnected), GND-referenced output, and an analog enable input requiring ≤0.4 V logic-low to enter shutdown (<2 µA supply current). Thermal hysteresis is limited to 0.5 mV/V over −40°C to 125°C, and long-term stability is 100 ppm over 1000 hours at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.5% initial accuracy - enables precise 12-bit ADC/DAC full-scale calibration without trimming. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - ensures ≤2.05 mV total drift across industrial temperature range. |
| Dropout Voltage | 120 mV typical at 1 mA - allows regulation from 4.2 V supply, critical for single-cell Li-ion or 5 V rail margining. |
| Supply Current | 160 µA typical - supports >1-year battery life in 10 µA sleep-mode sensor nodes. |
| Enable Threshold | VIL ≤ 0.4 V, VIH ≥ 2.4 V - compatible with standard CMOS/TTL logic without level-shifting. |
| Output Noise | 36 µVPP (10 Hz–10 kHz) - suitable for 16-bit SAR ADCs with <1 LSB noise contribution. |
| Load Drive | ±5 mA sink/source - directly drives op-amp inputs, ADC references, or small DAC buffers without external gain. |
Pinout & Package
SOT-23-5 (DBV) package: 1.60 mm × 2.90 mm body, 0.95 mm height, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Must remain unconnected; sensitive to noise and capacitive loading - requires guard ring and no trace routing. |
| 2 - GND | Ground reference | Primary return path for load current and internal bias; must connect to low-impedance analog ground plane. |
| 3 - EN | Enable control | Analog input: pull to VIN for active mode (≥2.4 V), pull to GND for shutdown (<0.4 V); 6 µA turn-on current. |
| 4 - VIN | Input supply | Accepts 2 V to 12 V; minimum headroom = VOUT + 120 mV (1 mA) - supports wide-input battery or regulator rails. |
| 5 - VOUT | Reference output | Stable 4.096 V source/sink; requires 0.022 µF ceramic capacitor (min) placed adjacent to pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 120 mV typical at 1 mA - enables use with 4.2 V Li-ion batteries while maintaining 4.096 V output. |
| Power-Down Mode | <2 µA supply current when EN ≤ 0.4 V - reduces system standby power by >99% vs active mode. |
| High Output Accuracy | ±0.5% initial tolerance - eliminates need for post-assembly calibration in cost-sensitive industrial sensors. |
| Wide Input Range | 2 V to 12 V operation - accommodates unregulated battery stacks, automotive transients, and legacy 5 V/12 V rails. |
| Robust Load Capability | ±5 mA sink/source - drives multiple ADC references or op-amp bias networks without external buffering. |
Applications
| Portable Instrumentation | Battery-Powered DAQ |
|---|---|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and internal DAC calibration. Use Value: 4.096 V output matches 212 full-scale count, enabling integer-based digital scaling and eliminating floating-point math. |
Use Scenario: Wireless environmental sensor node logging temperature/humidity with 12-bit ADC. IC Role / Device Role / Timing Role: Stable reference for ratiometric sensor excitation and ADC reference under varying battery voltage. Use Value: 50 ppm/°C drift ensures <0.1% measurement error across −20°C to 70°C operating range. |
| Precision Regulator Feedback | Medical Sensor Interface |
Use Scenario: Low-noise LDO regulator for analog front-end powering EEG amplifiers. IC Role / Device Role / Timing Role: Reference input to error amplifier controlling output voltage setpoint. Use Value: 36 µVPP (10 Hz–10 kHz) noise contributes <0.001% error to 4.096 V feedback loop, preserving SNR. |
Use Scenario: Pulse oximeter analog signal chain with photodiode TIA and ADC. IC Role / Device Role / Timing Role: Reference for correlated double sampling and LED current DAC. Use Value: ±5 mA drive capability powers both ADC reference and programmable LED bias without added components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C41IDBZR | Shunt reference; 4.096 V, ±0.5%, 100 ppm/°C; requires external bias resistor; no enable pin. | Fixed cathode-anode configuration; unsuitable for low-headroom or enable-controlled systems. | Select when board space permits shunt topology and enable control is unnecessary. |
| REF3040AIDBZR | Series reference; 4.096 V, ±0.2%, 50 ppm/°C; 150 µA supply current; no enable pin; 250 mV dropout. | Higher accuracy grade but lacks power-down; higher dropout limits use below 4.35 V input. | Select when 0.2% initial accuracy is mandatory and continuous operation is acceptable. |
Compared with LM4120IM5-4.1/NOPB, LM4040C41IDBZR requires external current-setting and offers no enable control, while REF3040AIDBZR provides tighter initial accuracy but sacrifices power-down capability and has higher dropout - making LM4120IM5-4.1/NOPB optimal for battery-constrained, enable-driven systems needing 4.096 V precision.
Availability
LM4120IM5-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and precision regulator feedback requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4120IM5-4.1/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 and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.
The LM4120 series was developed specifically for micropower, low-dropout voltage reference applications in portable and industrial systems where accuracy, stability, and enable-controlled power savings are critical.
FAQ
What is the maximum input voltage rating for LM4120IM5-4.1/NOPB?
The absolute maximum input voltage for LM4120IM5-4.1/NOPB is 14 V, as specified in the Absolute Maximum Ratings table. Continuous operation above 12 V is not recommended; the device is characterized for reliable operation from 2 V to 12 V under recommended conditions. Exceeding 14 V risks permanent damage to the internal bandgap circuitry and ESD protection structures.
Does LM4120IM5-4.1/NOPB require an external output capacitor, and what value is recommended?
Yes, LM4120IM5-4.1/NOPB requires a minimum 0.022 µF ceramic output capacitor placed adjacent to the VOUT and GND pins for loop 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 permitted using tantalum types, but require additional layout precautions per Section 8.1.
What is the function of the REF pin on LM4120IM5-4.1/NOPB, and how should it be handled?
The REF pin on LM4120IM5-4.1/NOPB is an internal reference node that must remain unconnected in all applications. It is highly sensitive to noise and capacitive loading; PCB layout guidelines mandate isolation via guard rings and avoidance of any trace routing or copper pour near this pin to prevent output voltage shift or instability.
Can LM4120IM5-4.1/NOPB operate with a 3.3 V input supply?
No - LM4120IM5-4.1/NOPB cannot regulate properly from a 3.3 V input because its minimum dropout voltage is 120 mV (typical) at 1 mA, requiring VIN ≥ 4.216 V to maintain 4.096 V output. For 3.3 V systems, a higher-output reference (e.g., 3.3 V variant) or a boost-regulated supply is required.
What is the thermal hysteresis specification for LM4120IM5-4.1/NOPB, and why does it matter?
LM4120IM5-4.1/NOPB exhibits 0.5 mV/V thermal hysteresis over −40°C to 125°C, meaning its output voltage may shift up to 2.05 mV after cycling between temperature extremes and returning to 25°C. This matters in metrology-grade instruments where repeatability after thermal stress is critical - users must characterize hysteresis during system-level validation.
LM4120IM5-4.1/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):
- 4.096V
- 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
LM4120IM5-4.1/NOPB FAQ
1.How can I place an order for LM4120IM5-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5-4.1/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 LM4120IM5-4.1/NOPB reliable?
The price and inventory of LM4120IM5-4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5-4.1/NOPB?
LM4120IM5-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5-4.1/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 LM4120IM5-4.1/NOPB?
For technical support, including LM4120IM5-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5-4.1/NOPB requirements.
6.How does Aetrix verify that LM4120IM5-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5-4.1/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 LM4120IM5-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5-4.1/NOPB?
All LM4120IM5-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5-4.1/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 LM4120IM5-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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