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Texas Instruments LM4120AIM5-4.1
- Part No.:
- LM4120AIM5-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5-4.1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,331
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Product details
Overview
LM4120AIM5-4.1 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 4.096 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 - optimized for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4120AIM5-4.1 datasheet, LM4120AIM5-4.1 pinout, LM4120AIM5-4.1 application, or LM4120AIM5-4.1 equivalent, key selection criteria include guaranteed 4.096 V output tolerance over −40°C to +85°C, enable-driven power-down (ISS < 2 µA), low-noise performance (36 µVPP, 10 Hz–10 kHz), and SOT-23-5 compatibility in space-constrained designs.
Technical Context
The LM4120AIM5-4.1 implements a trimmed bandgap core with internal error amplifier and pass transistor, enabling stable 4.096 V reference generation across 2 V to 12 V input range. Its enable pin controls analog startup/shutdown with logic-level thresholds (VH = 2.4 V, VL = 0.4 V) and <6 µA input current.
Operation is validated over industrial temperature range (−40°C to +85°C); temperature coefficient (50 ppm/°C) and long-term stability (100 ppm over 1000 hrs) are ensured across this range. The REF pin is internally connected and must remain unconnected externally to avoid noise coupling or regulation errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.2% (A-grade initial accuracy ensures ≤8.2 mV absolute error at 25°C) |
| Temperature Coefficient | 50 ppm/°C (ensured −40°C to +125°C; contributes ≤2.05 mV drift over full industrial range) |
| Dropout Voltage | 120 mV typical at 1 mA (enables operation with VIN as low as 4.216 V while maintaining regulation) |
| Supply Current | 160 µA typical (supports >1-year battery life in 10 µA-systems with duty-cycled enable) |
| Power-Down Current | <2 µA at VEN ≤ 0.2 V (reduces standby power by 80× vs active mode) |
| Output Drive | ±5 mA (supports direct driving of ADC reference inputs or op-amp bias networks without buffering) |
| Output Noise | 36 µVPP (10 Hz–10 kHz; meets 16-bit ADC SNR requirements without external filtering) |
Pinout & Package
SOT-23-5 (DBV) package: 1.60 mm × 2.90 mm body, 0.95 mm height, gull-wing leads. RoHS-compliant, lead finish Sn (matte tin), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Internally connected; must remain unconnected externally to prevent noise injection and regulation instability |
| 2 - GND | Ground reference | Primary return path for load current and supply current; requires low-impedance PCB connection |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for normal operation; pulled to GND disables output and reduces current to <2 µA |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; dropout headroom defined relative to VOUT (e.g., min VIN = 4.216 V @ 1 mA load) |
| 5 - VOUT | Regulated reference output | Delivers stable 4.096 V ±0.2%; capable of sourcing/sinking ±5 mA with ≤0.04%/mA load regulation |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces quiescent current to <2 µA, enabling ultra-low-power sleep modes in portable systems |
| Low dropout voltage | 120 mV typical at 1 mA allows operation from single Li-ion cells (3.0–4.2 V) with margin |
| High output accuracy | ±0.2% initial tolerance eliminates need for system-level calibration in 12-bit applications |
| Built-in noise filtering | 36 µVPP (10 Hz–10 kHz) supports high-resolution SAR and sigma-delta ADCs without external RC filters |
| Source/sink capability | ±5 mA drive strength enables direct interface to precision op-amps, DAC buffers, and multiplexer references |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-powered environmental sensor nodes logging temperature, humidity, and pressure at 10-second intervals. IC Role / Device Role / Timing Role: Provides stable 4.096 V reference for 16-bit SAR ADC and microcontroller VREF input. Use Value: Enables 12+ month battery life via 160 µA active current and <2 µA shutdown, while maintaining ±0.2% measurement accuracy across −25°C to +70°C operating range. |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART communication in oil & gas field instruments. IC Role / Device Role / Timing Role: Supplies precision reference for DAC generating loop current and for onboard ADC monitoring supply rail. Use Value: 50 ppm/°C tempco ensures ≤0.5% full-scale error over −40°C to +85°C ambient, meeting IEC 61293 Class 1.0 accuracy requirements. |
| Medical Patient Monitors | Test & Measurement Equipment |
|
Use Scenario: Portable ECG device acquiring biopotential signals with 12-bit resolution and real-time display. IC Role / Device Role / Timing Role: Reference for analog front-end PGA and ADC; also biases op-amp signal conditioning stages. Use Value: 36 µVPP broadband noise prevents degradation of 70 dB SNR target; ±5 mA drive eliminates need for discrete buffer amplifiers. |
Use Scenario: Benchtop multimeter performing 4½-digit DC voltage measurements using dual-slope integration. IC Role / Device Role / Timing Role: Primary reference for integrator capacitor charging and comparator threshold generation. Use Value: 100 ppm long-term stability over 1000 hours minimizes recalibration frequency; 0.04%/mA load regulation maintains accuracy across varying integrator loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3040AIDBZR | 4.096 V, ±0.2%, 50 ppm/°C, but no enable pin; 50 µA supply current | Lacks shutdown capability; unsuitable where ultra-low standby power is required | Choose when enable functionality is unnecessary and lower quiescent current is not critical |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1%, 10 ppm/°C, no enable; 120 µA supply current; higher cost | Superior accuracy and tempco, but no power management; requires external enable circuitry | Prefer for metrology-grade applications where 0.1% initial error and 10 ppm/°C are mandatory |
Compared with LM4120AIM5-4.1, REF3040AIDBZR trades enable functionality for lower supply current, while ADR3440ARJZ-R7 delivers tighter specifications at higher cost and complexity - making LM4120AIM5-4.1 optimal for cost-sensitive, battery-operated systems needing integrated power control.
Availability
LM4120AIM5-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical patient monitors requiring stable component supply with guaranteed long-term availability.
Supply support for LM4120AIM5-4.1 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 engineered for micropower, low-dropout voltage reference applications in battery-constrained and thermally demanding environments - emphasizing accuracy, stability, and integrated power control.
FAQ
What is the guaranteed initial accuracy of the LM4120AIM5-4.1 over temperature?
The LM4120AIM5-4.1 is an A-grade device with ±0.2% initial output voltage accuracy at 25°C. This tolerance is maintained across the industrial temperature range (−40°C to +85°C) per TI's electrical characteristics table, with no additional derating required for operation within this range. The LM4120AIM5-4.1 achieves this via laser-trimmed bandgap circuitry and on-die compensation.
Can the LM4120AIM5-4.1 operate from a single 3.7 V Li-ion cell?
Yes - the LM4120AIM5-4.1 supports input voltages down to 2 V and has a typical dropout voltage of 120 mV at 1 mA. With its 4.096 V output, it requires only VIN ≥ 4.216 V under 1 mA load. While a nominal 3.7 V Li-ion cell falls short, the LM4120AIM5-4.1 can operate during the upper 20% of the discharge curve (≥4.2 V) or with a boost pre-regulator. For true single-cell compatibility, consider the 3.3 V variant (LM4120AIM5-3.3).
What is the purpose of the REF pin on the LM4120AIM5-4.1, and how should it be connected?
The REF pin (Pin 1) on the LM4120AIM5-4.1 is an internal reference node that must remain unconnected in all applications. TI explicitly states this in the Pin Functions table and Functional Block Diagram. Connecting any external component - including capacitors or traces - introduces noise coupling and destabilizes regulation. PCB layout must isolate this pin with guard rings and avoid routing nearby signals.
How does the enable function behave during power-up and shutdown transitions?
The LM4120AIM5-4.1 enable pin (Pin 3) requires ≥2.4 V for normal operation and ≤0.4 V to enter shutdown. During power-up, the device starts regulating once VEN exceeds VH (2.4 V); during shutdown, pulling VEN ≤ VL (0.4 V) disables output within microseconds and reduces supply current to <2 µA. A minimum slew rate of 0.003 V/µs is recommended to prevent output glitches - easily met by standard CMOS drivers.
Is the LM4120AIM5-4.1 suitable for driving the reference input of a 16-bit ADC?
Yes - the LM4120AIM5-4.1 is well-suited for 16-bit ADC reference inputs. Its 4.096 V output matches common 16-bit full-scale ranges (e.g., 0–4.096 V = 65536 LSB), ±0.2% initial accuracy contributes <13 LSB error, and 36 µVPP (10 Hz–10 kHz) noise adds <0.6 LSB RMS noise. Combined with ±5 mA drive capability, it eliminates need for external buffers in most SAR and sigma-delta ADC implementations.
LM4120AIM5-4.1 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:
- ±0.2%
- 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
LM4120AIM5-4.1 FAQ
1.How can I place an order for LM4120AIM5-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5-4.1 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 LM4120AIM5-4.1 reliable?
The price and inventory of LM4120AIM5-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5-4.1 is usually 5 days.
3.What payment methods are accepted for LM4120AIM5-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5-4.1?
LM4120AIM5-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5-4.1 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 LM4120AIM5-4.1?
For technical support, including LM4120AIM5-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5-4.1 requirements.
6.How does Aetrix verify that LM4120AIM5-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5-4.1 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 LM4120AIM5-4.1 meets industry standards.
7.What is the process for return or replacement of LM4120AIM5-4.1?
All LM4120AIM5-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5-4.1, 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 LM4120AIM5-4.1 part is unused and in its original packaging.
Return procedure for LM4120AIM5-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120AIM5-4.1 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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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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