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Texas Instruments LM4120AIM5X-2.5
- Part No.:
- LM4120AIM5X-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5X-2.5.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,957
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Product details
Overview
LM4120AIM5X-2.5 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 2.5 V ±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 - designed for high-accuracy analog signal chains in space-constrained battery-powered systems.
For engineers reviewing the LM4120AIM5X-2.5 datasheet, LM4120AIM5X-2.5 pinout, LM4120AIM5X-2.5 application, or LM4120AIM5X-2.5 equivalent, key selection criteria include industrial-grade temperature stability (−40°C to 85°C), SOT-23-5 package compatibility, power-down current <2 μA, and noise performance of 46 μVPP (0.1–10 Hz) at 2.5 V output.
Technical Context
The LM4120AIM5X-2.5 implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling operation from VIN as low as 2 V up to 12 V. Its enable input controls a high-impedance analog switch that disables the reference core and reduces quiescent current to <2 μA.
It uses a dedicated REF pin (unconnected in normal operation) to isolate the sensitive bandgap node from PCB noise and capacitive loading. The device maintains regulation across load currents from −5 mA to +5 mA while ensuring line regulation ≤0.008%/V and load regulation ≤0.04%/mA over its specified temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.2% (A-grade initial accuracy at 25°C; ensures ADC/DAC reference stability) |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C; enables <±1.25 mV drift over full extended range) |
| Dropout Voltage | 120 mV typical at 1 mA (allows regulation from 2.62 V input; critical for low-VIN battery apps) |
| Supply Current | 160 μA typical (enables >1-year battery life in 10-μA sleep systems) |
| Power-Down Current | <2 μA at EN = GND (reduces standby loss in always-on sensor nodes) |
| Output Noise | 46 μVPP (0.1–10 Hz; meets 16-bit SAR ADC reference noise floor requirements) |
| Load Drive | ±5 mA (supports direct driving of op-amp inputs, ADC references, and small logic loads) |
Pinout & Package
LM4120AIM5X-2.5 is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for high-density PCB layouts and thermal performance (RθJA = 170.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Bandgap reference node | Must remain unconnected; sensitive to noise and capacitance - requires guard ring and isolation in layout |
| 2 - GND | Ground reference | Primary return path for load and supply current; must connect to low-impedance ground plane |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for active mode; pulled to GND to achieve <2 μA shutdown current |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; minimum headroom defined by dropout voltage (e.g., 2.62 V for 2.5 V output) |
| 5 - VOUT | Precision reference output | Delivers regulated 2.5 V with ±5 mA sourcing/sinking; requires 0.022–0.047 µF ceramic capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 120 mV typical at 1 mA enables use with single-cell Li-ion (3.0–4.2 V) or two-cell alkaline (2.4–3.2 V) supplies |
| Enable-Controlled Power-Down | Reduces supply current to <2 μA - essential for duty-cycled IoT sensors and portable medical devices |
| A-Grade Accuracy | ±0.2% initial tolerance eliminates need for system-level calibration in precision data acquisition |
| Wide Supply Range | Operates from 2 V to 12 V - supports both low-voltage microcontrollers and higher-voltage industrial rails |
| Source/Sink Capability | ±5 mA output drive allows direct interface to ADC reference inputs, op-amp bias networks, and DAC buffers |
Applications
| Portable Instrumentation | Battery-Powered Sensors |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary 2.5 V reference for ADC and analog front-end gain stages. Use Value: 50 ppm/°C drift and 46 μVPP noise ensure <±0.01% measurement accuracy across 0–50°C operating range. |
Use Scenario: Wireless environmental sensor node powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Stable reference for ultra-low-power ADC sampling during wake-up bursts. Use Value: 160 μA operating current and <2 μA shutdown current extend battery life beyond 2 years at 1-sample/minute duty cycle. |
| Industrial Process Monitoring | Medical Vital Sign Acquisition |
Use Scenario: DIN-rail mounted temperature transmitter with 4–20 mA loop output. IC Role / Device Role / Timing Role: Reference for precision current-sense amplifier and DAC controlling loop current. Use Value: ±0.2% initial accuracy and −40°C to 85°C guaranteed operation eliminate field recalibration in harsh factory environments. |
Use Scenario: Portable ECG monitor with 24-bit delta-sigma ADC and analog lead-off detection. IC Role / Device Role / Timing Role: Low-noise 2.5 V reference for ADC and analog signal conditioning chain. Use Value: 46 μVPP (0.1–10 Hz) noise floor supports sub-μV bio-potential resolution without additional filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBVR | 2.5 V, ±0.2%, 50 ppm/°C, 50 μA supply current, no enable pin, SOT-23-5 | Lacks power-down control; lower quiescent current but no shutdown mode | Select when lowest possible operating current is critical and enable functionality is unnecessary |
| ADR3425ARJZ-R7 | 2.5 V, ±0.1%, 10 ppm/°C, 120 μA supply current, no enable pin, SOT-23-5 | Higher initial accuracy and lower tempco, but no enable and higher cost | Select when ultra-high stability (<10 ppm/°C) is required and power-down is not needed |
Compared with REF3025AIDBVR and ADR3425ARJZ-R7, the LM4120AIM5X-2.5 uniquely balances A-grade accuracy, integrated enable control, and micropower operation - making it optimal for battery-powered systems requiring both precision and dynamic power management.
Availability
LM4120AIM5X-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and industrial process monitoring requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4120AIM5X-2.5 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 analog ICs and voltage references.
The LM4120 series was developed specifically for high-accuracy, low-power reference needs in portable, industrial, and medical equipment - emphasizing micropower operation, low dropout, and robust temperature performance in compact SOT-23 packaging.
FAQ
What is the maximum input voltage rating for LM4120AIM5X-2.5?
The absolute maximum input voltage on the VIN pin of LM4120AIM5X-2.5 is 14 V. Exceeding this may cause permanent damage. For reliable operation, TI specifies a recommended maximum of 12 V under normal conditions, with sufficient margin to accommodate transient spikes in industrial or automotive environments.
Does LM4120AIM5X-2.5 require an external output capacitor, and if so, what value?
Yes, LM4120AIM5X-2.5 requires a minimum 0.022 µF ceramic output capacitor for stability. TI recommends 0.022–0.047 µF ceramic capacitors with ESR ≤0.5 Ω; values up to 1 µF tantalum are permitted but require additional design validation per Section 8.1 of the datasheet.
What is the function of the REF pin on LM4120AIM5X-2.5, and how should it be handled?
The REF pin on LM4120AIM5X-2.5 is the internal bandgap reference node and must remain unconnected in all applications. It is highly sensitive to noise and capacitive loading - PCB layout must isolate it with guard rings and avoid routing traces or vias nearby to prevent output voltage shift or instability.
Can LM4120AIM5X-2.5 sink current, and what is its maximum sink capability?
Yes, LM4120AIM5X-2.5 can both source and sink up to ±5 mA. Its sink capability is fully specified down to −5 mA, enabling bidirectional current flow - useful for driving op-amp inputs, biasing transducers, or interfacing with current-mode DACs without external components.
What is the thermal hysteresis specification for LM4120AIM5X-2.5, and why does it matter?
LM4120AIM5X-2.5 has a thermal hysteresis of 0.5 mV/V (max) over −40°C to 125°C, meaning output voltage may shift by up to ±1.25 mV after cycling between temperature extremes. This matters in metrology-grade instruments where repeatability across thermal cycles is critical - users should characterize hysteresis in final system testing.
LM4120AIM5X-2.5 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):
- 2.5V
- 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-2.5 FAQ
1.How can I place an order for LM4120AIM5X-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5X-2.5 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-2.5 reliable?
The price and inventory of LM4120AIM5X-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5X-2.5 is usually 5 days.
3.What payment methods are accepted for LM4120AIM5X-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5X-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5X-2.5?
LM4120AIM5X-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5X-2.5 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-2.5?
For technical support, including LM4120AIM5X-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5X-2.5 requirements.
6.How does Aetrix verify that LM4120AIM5X-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5X-2.5 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-2.5 meets industry standards.
7.What is the process for return or replacement of LM4120AIM5X-2.5?
All LM4120AIM5X-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5X-2.5, 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-2.5 part is unused and in its original packaging.
Return procedure for LM4120AIM5X-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120AIM5X-2.5 Tags
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