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Texas Instruments LM4120AIM5X-4.1
- Part No.:
- LM4120AIM5X-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5X-4.1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,305
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Product details
Overview
LM4120AIM5X-4.1 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference in SOT-23-5 package, 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 supports source/sink current up to ±5 mA and operates from 2 V to 12 V input, enabling use in battery-powered data acquisition systems requiring stable, low-power reference voltage.
For engineers reviewing the LM4120AIM5X-4.1 datasheet, LM4120AIM5X-4.1 pinout, LM4120AIM5X-4.1 application, or LM4120AIM5X-4.1 equivalent, key selection criteria include its enable-controlled power-down mode (ISS < 2 µA), low 160 µA typical supply current, fixed 4.096 V output optimized for 12-bit ADCs, and industrial-grade −40°C to +85°C operation.
Technical Context
The LM4120AIM5X-4.1 implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling low-dropout regulation down to 120 mV at 1 mA. Its enable pin provides analog control with logic-high threshold ≥2.4 V and logic-low threshold ≤0.4 V, allowing direct interface with CMOS/TTL outputs.
It features a dedicated REF pin (unconnected in all applications) for noise-sensitive internal node isolation, and GND pin current varies with load-0.5 µA at no load, rising to ~1.5 µA at 5 mA sink-supporting accurate ground-path analysis in precision layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.2% (A-grade initial accuracy; matches common 12-bit DAC/ADC full-scale scaling) |
| Temperature Coefficient | 50 ppm/°C (ensured over −40°C to +125°C; enables stable performance across industrial thermal range) |
| Dropout Voltage | 120 mV typical at 1 mA (allows operation with VIN as low as 4.216 V while maintaining regulation) |
| Supply Current | 160 µA typical (enables >1-year battery life in 10 µA average-current portable systems) |
| Power-Down Current | <2 µA (achieved when EN ≤ 0.4 V; reduces standby power by >98% vs active mode) |
| Output Current Capability | ±5 mA (supports direct driving of ADC reference inputs or op-amp bias networks without buffering) |
| Line Regulation | 0.008 %/V (0.33 mV change per volt VIN variation; critical for unregulated battery-supplied rails) |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, tape-and-reel (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Internal reference node | Must remain unconnected; sensitive to noise and capacitive loading; PCB isolation required |
| 2 - GND | Ground return path | Carries load-dependent current (0.5–1.5 µA); requires low-impedance connection to minimize ground shift errors |
| 3 - EN | Enable control input | Analog input with 6 µA typical turn-on current; logic-high ≥2.4 V enables output; logic-low ≤0.4 V disables output |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; minimum headroom = VOUT + dropout (e.g., 4.216 V min for 4.096 V output) |
| 5 - VOUT | Stable reference output | Delivers 4.096 V ±0.2% with ±5 mA sourcing/sinking; requires 0.022–0.047 µF ceramic capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to <2 µA, enabling ultra-low-power sleep modes in portable instrumentation |
| Low 120 mV dropout | Permits operation from single Li-ion cell (3.0–4.2 V) while regulating 4.096 V output during discharge |
| 4.096 V output voltage | Exactly matches 212 scaling for 12-bit data converters, eliminating gain calibration in precision measurement |
| 50 ppm/°C tempco | Ensures ≤1.65 mV drift over −40°C to +85°C ambient, meeting Class I industrial sensor reference requirements |
| ±5 mA output drive | Directly drives 10 kΩ ADC reference inputs or multiple op-amp bias points without external buffers |
Applications
| Portable Data Loggers | Industrial Sensor Signal Chains |
|---|---|
Use Scenario: Battery-powered environmental monitor sampling temperature, humidity, and pressure at 1 Hz using 12-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 4.096 V reference for ADC conversion, synchronized with microcontroller's acquisition trigger. Use Value: Enables 12-bit effective resolution without software calibration; 160 µA quiescent current extends 2×AA battery life beyond 18 months. |
Use Scenario: 4–20 mA loop-powered transmitter conditioning RTD bridge output before current-loop modulation. IC Role / Device Role / Timing Role: Supplies excitation voltage and ADC reference in same 3.3 V–4.2 V loop supply domain. Use Value: 50 ppm/°C tempco ensures <±0.1% FS error over −40°C to +85°C operating range; low dropout allows operation near loop supply minimum. |
| Medical Vital Sign Monitors | Automotive Body Control Modules |
Use Scenario: Wearable ECG front-end digitizing biopotential signals with 12-bit resolution and DC-coupled baseline stability. IC Role / Device Role / Timing Role: Reference for precision ADC and bias generator for instrumentation amplifiers. Use Value: 4.096 V output eliminates gain scaling in firmware; enable pin allows dynamic power gating during idle periods to meet IEC 62304 low-power requirements. |
Use Scenario: In-cabin air quality sensor node measuring CO₂ and VOC levels via NDIR detection with integrated ADC. IC Role / Device Role / Timing Role: Stable reference for 12-bit ADC reading thermopile and photodiode signals under varying battery voltage (9–16 V). Use Value: 120 mV dropout ensures regulation remains active even during cold-crank events (VIN dips to ~9 V); A-grade accuracy avoids factory calibration. |
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 SOT-23-3, no enable pin, 50 µA supply current | Lacks shutdown capability; unsuitable where dynamic power cycling is required | Select when board space is constrained and continuous operation suffices |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1%, 10 ppm/°C, SOT-23-5, no enable, 120 µA supply current | Higher accuracy and lower tempco, but no power-down mode and higher cost | Select when long-term stability and ultra-low drift dominate over power management needs |
Compared with REF3040AIDBZR and ADR3440ARJZ-R7, the LM4120AIM5X-4.1 uniquely balances A-grade accuracy, enable-controlled shutdown, and SOT-23-5 compatibility-making it optimal for battery-constrained systems requiring both precision and dynamic power control.
Availability
LM4120AIM5X-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical monitoring equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LM4120AIM5X-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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
The LM4120 series was designed for high-accuracy, low-power voltage referencing in space- and energy-constrained applications-including portable test gear, sensor nodes, and battery-backed measurement systems.
FAQ
What is the maximum input voltage rating for LM4120AIM5X-4.1?
The absolute maximum input voltage on the VIN pin of LM4120AIM5X-4.1 is 14 V. Operation above this level risks permanent damage. For reliable function, VIN must stay within the recommended range of 2 V to 12 V, with sufficient headroom above VOUT to maintain regulation-e.g., ≥4.216 V for 4.096 V output at 1 mA load. The device includes internal protection against reverse polarity and short-circuit conditions.
Does LM4120AIM5X-4.1 require an external output capacitor, and if so, what value?
Yes, LM4120AIM5X-4.1 requires a minimum 0.022 µF ceramic output capacitor for stability, with optimal range 0.022–0.047 µF. Larger values up to 1 µF are permissible but require tantalum construction beyond 0.047 µF; a 50 pF capacitor between VOUT and REF is mandatory in those cases. The capacitor must be placed close to VOUT and GND pins to minimize parasitic inductance and ensure transient response integrity.
Can the REF pin of LM4120AIM5X-4.1 be connected to ground or left floating?
No-the REF pin of LM4120AIM5X-4.1 must remain unconnected in all configurations. It is an internal bandgap node highly sensitive to noise and capacitive loading. Connecting it to ground, VOUT, or any other node will degrade accuracy, increase output noise, and potentially cause instability. PCB layout must isolate this pin with guard traces and avoid routing nearby signals or copper pours.
What is the typical startup time for LM4120AIM5X-4.1 after enabling?
The typical startup time for LM4120AIM5X-4.1 is 100 µs from EN rising above 2.4 V to VOUT settling within 0.1% of 4.096 V, as shown in Figure 30 of the datasheet. This timing assumes COUT = 0.022 µF and VIN ≥ 4.2 V. Startup is independent of load current up to ±5 mA and remains consistent across −40°C to +85°C ambient temperature.
How does the enable pin behavior differ between LM4120AIM5X-4.1 and standard non-A versions?
The enable pin functionality is identical across all LM4120 variants including LM4120AIM5X-4.1: logic-high ≥2.4 V enables output, logic-low ≤0.4 V disables output, and 6 µA typical current flows into EN during turn-on. The "A" suffix denotes initial accuracy (±0.2% vs ±0.5%) and does not affect enable electrical characteristics, timing, or power-down current (<2 µA), which are consistent across A-grade and standard-grade devices.
LM4120AIM5X-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
LM4120AIM5X-4.1 FAQ
1.How can I place an order for LM4120AIM5X-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5X-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 LM4120AIM5X-4.1 reliable?
The price and inventory of LM4120AIM5X-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 LM4120AIM5X-4.1 is usually 5 days.
3.What payment methods are accepted for LM4120AIM5X-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5X-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5X-4.1?
LM4120AIM5X-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5X-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 LM4120AIM5X-4.1?
For technical support, including LM4120AIM5X-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5X-4.1 requirements.
6.How does Aetrix verify that LM4120AIM5X-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5X-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 LM4120AIM5X-4.1 meets industry standards.
7.What is the process for return or replacement of LM4120AIM5X-4.1?
All LM4120AIM5X-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5X-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 LM4120AIM5X-4.1 part is unused and in its original packaging.
Return procedure for LM4120AIM5X-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120AIM5X-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
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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