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Texas Instruments LM4120IM5-2.0
- Part No.:
- LM4120IM5-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5-2.0.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,085
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Product details
Overview
LM4120IM5-2.0 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 - enabling stable biasing in battery-powered data acquisition systems and portable instrumentation.
For engineers reviewing the LM4120IM5-2.0 datasheet, LM4120IM5-2.0 pinout, LM4120IM5-2.0 application, or LM4120IM5-2.0 equivalent, key selection criteria include enable-controlled power-down (≤2 µA), ±5 mA source/sink capability, SOT-23-5 package compatibility, and industrial-temperature operation (−40°C to 85°C) without external compensation.
Technical Context
The LM4120IM5-2.0 implements a bandgap-based reference core with integrated enable control and low-impedance output buffer. Its architecture supports operation from VIN = 2 V to 12 V while maintaining regulation down to VIN − VOUT = 120 mV (typ) at 1 mA load.
It features a dedicated REF pin (unconnected), GND-referenced enable logic with 0.4 V low threshold and 2.4 V high threshold, and internal thermal hysteresis ≤0.5 mV/V over −40°C to 125°C - ensuring stability across thermal cycling in embedded sensor nodes and precision ADC front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V ±0.5% (initial accuracy at 25°C; enables direct interface with 12-bit SAR ADCs) |
| Temperature Coefficient | 50 ppm/°C (ensured over −40°C to 125°C; supports <±0.1% drift in industrial environments) |
| Dropout Voltage | 120 mV typical at 1 mA (allows operation from 2.15 V supply in coin-cell applications) |
| Supply Current | 160 µA typical (enables >1-year battery life in 10 µA average-power IoT sensors) |
| Power-Down Current | ≤2 µA (achieved when EN ≤0.2 V; reduces standby power by 80× vs active mode) |
| Output Drive | ±5 mA (supports driving 10 kΩ DAC references or multiple op-amp bias networks) |
| Noise (0.1–10 Hz) | 20 µVPP (low flicker noise preserves SNR in precision weigh-scale amplifiers) |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant tin-silver (Cu Sn) 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 isolation in PCB layout |
| 2 - GND | Ground return | Primary current return path for load, supply, and enable; connects to low-impedance ground plane |
| 3 - EN | Enable control input | Analog input with 0.4 V low / 2.4 V high thresholds; pull to VIN for always-on, to GND for shutdown |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; bypass with 0.1 µF ceramic capacitor recommended for transient immunity |
| 5 - VOUT | Regulated output | 2.048 V reference source/sink; stable with 0.022–0.047 µF ceramic output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces quiescent current to ≤2 µA - critical for energy harvesting and wake-on-event systems |
| Low dropout operation | 120 mV typical at 1 mA enables use with single Li-ion or two alkaline cells without LDO pre-regulation |
| Source/sink capability | ±5 mA output drive eliminates need for external buffer op-amps in multi-channel sensor signal chains |
| Stability without external compensation | Operates unconditionally stable with 0.022–0.047 µF ceramic output capacitors - simplifies BOM and layout |
| Industrial temperature range | Specified performance from −40°C to +85°C - suitable for automotive cabin electronics and factory-floor PLC modules |
Applications
| Portable Data Loggers | Medical Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous 12-bit ECG waveform sampling powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Precision 2.048 V reference for ADS1115 ADC, enabling ±1 LSB accuracy over temperature. Use Value: 160 µA supply current and enable-controlled shutdown extend battery life beyond 18 months. |
Use Scenario: Battery-backed pulse oximeter with analog front-end requiring stable gain calibration. IC Role / Device Role / Timing Role: Low-noise (20 µVPP) reference for transimpedance amplifier bias and ADC reference. Use Value: 50 ppm/°C tempco ensures <±0.05% full-scale error across patient-body-temperature operating range. |
| Industrial Sensor Transmitters | Smart Energy Metering Modules |
|
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary voltage reference for microcontroller's internal ADC and analog output stage. Use Value: SOT-23-5 footprint and −40°C to +85°C rating allow direct integration into compact DIN-rail enclosures. |
Use Scenario: Class 0.5 polyphase electricity meter with isolated metrology SoC and anti-tampering circuitry. IC Role / Device Role / Timing Role: Stable 2.048 V reference for metrology ADC and real-time clock backup regulator. Use Value: 0.5% initial accuracy and long-term stability (100 ppm/1000 hrs) maintain billing-grade accuracy over 10-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4120AIM5-2.0/NOPB | 0.2% initial accuracy (vs 0.5% for LM4120IM5-2.0); same package, tempco, and enable functionality | Required where 12-bit+ system accuracy must be guaranteed at power-up without calibration | Select when absolute initial accuracy outweighs cost sensitivity in medical or test equipment |
| REF3020AIDBZR | 2.048 V output, 0.2% accuracy, 50 ppm/°C, but no enable pin and 55 µA supply current (vs 160 µA) | Lacks shutdown control; better suited for always-on, ultra-low-quiescent systems like battery gauges | Choose when enable functionality is unnecessary and lower supply current is prioritized over programmable power control |
Compared with LM4120IM5-2.0, the LM4120AIM5-2.0 offers tighter initial accuracy for calibrated systems, while REF3020AIDBZR trades enable control for lower quiescent current - making LM4120IM5-2.0 optimal for cost-sensitive, enable-driven portable instrumentation.
Availability
LM4120IM5-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical vital sign monitors requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4120IM5-2.0 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 1951.
The LM4120 series was designed specifically for micropower, low-dropout voltage reference applications in space-constrained, battery-operated systems - emphasizing enable control, wide input range, and industrial temperature reliability.
FAQ
What is the output voltage tolerance of the LM4120IM5-2.0 over temperature?
The LM4120IM5-2.0 guarantees a temperature coefficient of 50 ppm/°C over −40°C to 125°C, resulting in ≤±0.5% total output variation across the industrial temperature range (−40°C to +85°C). This is confirmed in Section 6.5 of the SNVS049F datasheet under TCVOUT/°C specifications for the 2.048 V option. The LM4120IM5-2.0 maintains this spec without external trimming or calibration.
Can the LM4120IM5-2.0 drive a 10 kΩ load directly?
Yes, the LM4120IM5-2.0 can drive a 10 kΩ load directly: at 2.048 V output, this draws 205 µA, well within its ±5 mA source/sink capability. Load regulation is specified at 0.03%/mA (typical), meaning output deviation remains <0.006% under this condition - fully compatible with 12-bit precision requirements. No external buffer is needed.
What is the minimum input voltage required for regulation with the LM4120IM5-2.0?
The LM4120IM5-2.0 requires VIN ≥ VOUT + dropout voltage. With 2.048 V output and 120 mV typical dropout at 1 mA, the minimum functional input is 2.168 V. Absolute minimum VIN is 2 V per Recommended Operating Conditions, but regulation is not ensured below VOUT + 120 mV. For reliable operation at 1 mA load, use VIN ≥ 2.2 V.
Is the REF pin on the LM4120IM5-2.0 required to connect to anything?
No - the REF pin on the LM4120IM5-2.0 must remain unconnected in all applications. As stated in the Pin Functions table (page 5) and Feature Description (Section 7.3.2), it is a sensitive internal node susceptible to noise and capacitive loading. PCB layout must isolate REF with guard rings and avoid routing traces or copper near it to prevent output instability or accuracy degradation.
Does the LM4120IM5-2.0 require an output capacitor for stability?
Yes, the LM4120IM5-2.0 requires a minimum 0.022 µF ceramic output capacitor for loop stability, as specified in Section 8.1 and Figure 29. It is stable with 0.022–0.047 µF ceramic capacitors (ESR 0.1–0.5 Ω). Larger values (up to 1 µF) are allowed only with tantalum types and require an additional 50 pF capacitor between VOUT and REF - but this configuration is not recommended unless validated across temperature and load.
LM4120IM5-2.0 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 FAQ
1.How can I place an order for LM4120IM5-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5-2.0 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 reliable?
The price and inventory of LM4120IM5-2.0 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 is usually 5 days.
3.What payment methods are accepted for LM4120IM5-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5-2.0?
LM4120IM5-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5-2.0 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?
For technical support, including LM4120IM5-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5-2.0 requirements.
6.How does Aetrix verify that LM4120IM5-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4120IM5-2.0 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 meets industry standards.
7.What is the process for return or replacement of LM4120IM5-2.0?
All LM4120IM5-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5-2.0, 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 part is unused and in its original packaging.
Return procedure for LM4120IM5-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5-2.0 Tags
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