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Texas Instruments LM4120AIM5-2.5
- Part No.:
- LM4120AIM5-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5-2.5.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,982
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Product details
Overview
LM4120AIM5-2.5 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference in SOT-23-5 package, delivering 2.5 V ±0.2% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load. It supports source/sink output current up to ±5 mA and operates from 2 V to 12 V input with 160 μA typical supply current - ideal for battery-powered instrumentation requiring stable, low-power reference voltage.
For engineers reviewing the LM4120AIM5-2.5 datasheet, LM4120AIM5-2.5 pinout, LM4120AIM5-2.5 application, or LM4120AIM5-2.5 equivalent, key selection factors include enable-controlled power-down (<2 μA), low-noise performance (46 μVPP over 0.1–10 Hz), thermal hysteresis (0.5 mV/V), and industrial-grade operation (−40°C to +85°C) in a 1.60 mm × 2.90 mm footprint.
Technical Context
The LM4120AIM5-2.5 implements a bandgap-based reference core with integrated enable control logic and low-impedance output buffer. Its architecture enables operation down to 2 V input while maintaining regulation across −40°C to +85°C ambient, with guaranteed 50 ppm/°C drift over −40°C to +125°C junction range.
It features an analog enable input requiring ~6 μA to activate, with defined logic thresholds (VH = 2.4 V, VL = 0.4 V), and includes internal protection against reverse conduction via parasitic diode between VIN and VOUT. The unconnected REF pin demands careful PCB isolation to avoid noise coupling and capacitive loading effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.2% initial accuracy - ensures minimal calibration burden in 12-bit+ data acquisition systems |
| Temperature Coefficient | 50 ppm/°C (−40°C to +125°C) - maintains ≤±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 single-cell Li-ion or coin-cell applications |
| Supply Current | 160 μA typical - enables >1-year runtime on 220 mAh coin cell at 1 mA load cycling |
| Enable Control | Logic-compatible input (VH ≥ 2.4 V, VL ≤ 0.4 V); <2 μA shutdown current - supports ultra-low-power wake-on-event architectures |
| Output Noise | 46 μVPP (0.1–10 Hz) - meets SNR requirements for 16-bit SAR ADCs without external filtering |
| Load Drive | ±5 mA source/sink - directly drives ADC reference inputs, op-amp bias networks, or DAC buffers without gain stages |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, with exposed pad not electrically connected. RoHS-compliant, lead finish Sn (matte tin), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Must remain unconnected; sensitive to noise and capacitance - requires guard ring and no routing nearby |
| 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 with ~6 μA activation current; tie to VIN for always-on, or drive with CMOS/TTL for power gating |
| 4 - VIN | Positive supply input | Operates from 2 V to 12 V; bypass with 0.1 μF ceramic capacitor near pin for PSRR improvement |
| 5 - VOUT | Regulated output | 2.5 V reference output capable of sourcing/sinking ±5 mA; place 0.022–0.047 μF ceramic capacitor directly at pin |
Key Features
| Feature | Design Value |
|---|---|
| Precision low-dropout operation | 120 mV dropout at 1 mA enables use with 2.6 V supplies - extends battery life in portable medical sensors |
| Enable-controlled power-down | <2 μA quiescent current in shutdown - reduces system standby power by >99% vs active mode |
| Low-output-noise design | 46 μVPP (0.1–10 Hz) - eliminates need for post-regulator RC filtering in high-resolution measurement front-ends |
| Industrial temperature rating | Specified over −40°C to +85°C ambient - qualified for automotive cabin, industrial PLC, and outdoor IoT node deployments |
| Source/sink capability | ±5 mA output drive - directly interfaces with SAR ADC reference pins, op-amp feedback networks, and precision current sources |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld multimeter with 16-bit ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and internal calibration circuitry. Use Value: 0.2% initial accuracy and 50 ppm/°C drift ensure <±0.02% total error over operating temperature without factory recalibration. |
Use Scenario: Remote environmental sensor node powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Stable reference for low-power SAR ADC sampling temperature/humidity readings. Use Value: 160 μA supply current and enable-controlled shutdown extend battery life beyond 2 years at 1-sample-per-minute duty cycle. |
| Precision Regulators | Medical Diagnostic Sensors |
Use Scenario: Low-noise LDO reference stage in programmable bench power supply. IC Role / Device Role / Timing Role: Set-point reference for feedback loop controlling output voltage accuracy. Use Value: 46 μVPP low-frequency noise prevents ripple-induced errors in sub-mV output resolution. |
Use Scenario: ECG front-end amplifier with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Reference voltage for ADC and bias generation for instrumentation amplifiers. Use Value: ±5 mA drive capability powers both ADC reference and op-amp bias networks without additional regulators. |
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, but 50 μA supply current - lower quiescent draw than LM4120AIM5-2.5 | No enable pin; fixed-on operation only - unsuitable for power-gated systems | Select when ultra-low IQ is prioritized over dynamic power control |
| ADR3425ARJZ-R7 | 2.5 V ±0.1%, 10 ppm/°C, 125 μA supply current - higher initial accuracy and lower drift | SOT-23-5 package but no enable function; specified over −40°C to +125°C junction | Select when long-term stability and tighter drift specs outweigh need for shutdown capability |
Compared with REF3025AIDBVR and ADR3425ARJZ-R7, the LM4120AIM5-2.5 uniquely balances enable-controlled power management, industrial temperature operation, and cost-effective precision - making it optimal for battery-cycled instrumentation where dynamic power control is essential.
Availability
LM4120AIM5-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and precision regulators requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4120AIM5-2.5 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs since the 1980s.
The LM4120 series was designed for low-power, high-accuracy voltage referencing in space-constrained, battery-operated systems - emphasizing micropower operation, enable control, and robustness across industrial temperature ranges.
FAQ
What is the maximum input voltage for LM4120AIM5-2.5?
The absolute maximum input voltage for LM4120AIM5-2.5 is 14 V, but recommended operating conditions specify a maximum of 12 V. Exceeding 12 V risks violating safe operating area limits and may degrade long-term stability. The device functions correctly from 2 V to 12 V input, with dropout voltage increasing linearly above minimum required headroom.
Does LM4120AIM5-2.5 require an output capacitor, and what value is recommended?
Yes, LM4120AIM5-2.5 requires a minimum 0.022 μF ceramic output capacitor for stability. TI recommends 0.022–0.047 μF X7R or C0G ceramics placed directly at the VOUT pin. Larger values (up to 1 μF) are permissible with tantalum capacitors but require a 50-pF capacitor between VOUT and REF - a configuration not needed for standard operation with 0.022 μF.
Can the REF pin of LM4120AIM5-2.5 be left floating or connected to ground?
No - the REF pin of LM4120AIM5-2.5 must remain unconnected (open) in all configurations. Connecting it to ground, VOUT, or any other node introduces error due to internal node sensitivity and capacitive loading effects. Layout guidelines mandate isolation via guard ring and avoidance of nearby traces or vias to prevent noise coupling and output voltage shift.
What is the power-down current of LM4120AIM5-2.5, and how is it achieved?
The power-down current of LM4120AIM5-2.5 is less than 2 μA when the EN pin is pulled to ≤0.2 V (logic low). This state disables the internal bandgap and output buffer, reducing supply current by >98% versus active mode (160 μA typical). The EN pin draws only 0.1 μA in shutdown, enabling direct interface with low-drive GPIOs.
Is LM4120AIM5-2.5 suitable for automotive under-hood applications?
No - LM4120AIM5-2.5 is rated for −40°C to +85°C ambient temperature, which covers passenger cabin and infotainment systems but not under-hood environments (typically −40°C to +125°C or higher). For under-hood use, TI offers extended-temperature variants (e.g., LM4120QAIM5-2.5) qualified to AEC-Q100 and specified over −40°C to +125°C - LM4120AIM5-2.5 itself is not qualified for such conditions.
LM4120AIM5-2.5 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
LM4120AIM5-2.5 FAQ
1.How can I place an order for LM4120AIM5-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5-2.5 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 LM4120AIM5-2.5 reliable?
The price and inventory of LM4120AIM5-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5-2.5 is usually 5 days.
3.What payment methods are accepted for LM4120AIM5-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5-2.5?
LM4120AIM5-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5-2.5 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 LM4120AIM5-2.5?
For technical support, including LM4120AIM5-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5-2.5 requirements.
6.How does Aetrix verify that LM4120AIM5-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5-2.5 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 LM4120AIM5-2.5 meets industry standards.
7.What is the process for return or replacement of LM4120AIM5-2.5?
All LM4120AIM5-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5-2.5, 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 LM4120AIM5-2.5 part is unused and in its original packaging.
Return procedure for LM4120AIM5-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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