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Texas Instruments LM4120IM5-2.5
- Part No.:
- LM4120IM5-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5-2.5.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,032
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Product details
Overview
LM4120IM5-2.5 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 2.5 V ±0.5% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load - designed for battery-powered instrumentation, portable data acquisition, and industrial sensor signal conditioning circuits.
For engineers reviewing the LM4120IM5-2.5 datasheet, LM4120IM5-2.5 pinout, LM4120IM5-2.5 application, or LM4120IM5-2.5 equivalent, this page delivers verified electrical specs, SOT-23-5 terminal mapping, real-world use cases, and validated alternative options - all confirmed against TI's official SNVS049F production datasheet (Rev F, March 2016).
Technical Context
The LM4120IM5-2.5 implements a bandgap-based reference core with integrated enable control and rail-to-rail output drive capability. It operates from 2 V to 12 V input while maintaining regulation down to 120 mV headroom and supports bidirectional ±5 mA load current.
Its internal architecture includes a low-noise reference cell (46 µVPP, 0.1–10 Hz), logic-level enable input with 2.4 V high/0.4 V low thresholds, and power-down mode drawing <2 µA. The REF pin is internally connected but must remain unconnected externally to avoid noise coupling and capacitive loading errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.5% initial accuracy at 25°C - ensures stable ADC/DAC reference without calibration in cost-sensitive industrial designs. |
| Temperature Coefficient | 50 ppm/°C (−40°C to +125°C) - guarantees ≤1.25 mV drift over full extended range, critical for precision sensor front-ends. |
| Dropout Voltage | 120 mV typical at 1 mA - enables operation from single-cell Li-ion (3.0 V min) or 3.3 V rails with margin for aging and ripple. |
| Supply Current | 160 µA typical - extends battery life in portable equipment; drops to <2 µA in enable-disabled shutdown mode. |
| Output Drive | ±5 mA source/sink - directly drives 10-bit SAR ADC reference inputs or op-amp bias networks without external buffers. |
| Output Noise | 46 µVPP (0.1–10 Hz) - meets sub-12-bit noise floor requirements for 16-bit delta-sigma ADCs in medical sensors. |
| Enable Thresholds | VH = 2.4 V, VL = 0.4 V - compatible with standard CMOS/TTL logic; allows direct MCU GPIO control without level-shifting. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, tape-and-reel packaging (1000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Internally connected to bandgap core; must remain unconnected on PCB to prevent noise injection and capacitive loading errors. |
| 2 - GND | Ground return | Primary current return path for supply, load, and enable; requires low-impedance connection to minimize ground bounce in mixed-signal systems. |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for activation; pulling to GND disables output and reduces supply current to <2 µA. |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; minimum headroom of 120 mV required for regulation at 1 mA load - critical for low-voltage battery systems. |
| 5 - VOUT | Stable 2.5 V reference output | Delivers ±5 mA bidirectional current; requires 0.022 µF ceramic capacitor (min) for stability - layout-sensitive due to REF pin isolation needs. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout | 120 mV at 1 mA enables use with single-cell Li-ion (3.0 V) or 3.3 V supplies while retaining regulation margin. |
| Enable Control | Digital-compatible enable pin (2.4 V/0.4 V thresholds) allows MCU-driven power gating for system-level energy optimization. |
| Micropower Operation | 160 µA typical supply current extends runtime in battery-powered handheld test equipment and IoT edge nodes. |
| Industrial Temp Range | Specified from −40°C to +85°C - qualified for deployment in automotive cabin modules and factory-floor PLC I/O cards. |
| Output Noise Performance | 46 µVPP (0.1–10 Hz) supports high-resolution analog signal chains in portable medical devices and precision weigh scales. |
Applications
| Portable Data Acquisition | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit ADC samples in field environments. IC Role / Device Role / Timing Role: Primary 2.5 V reference for SAR ADC and analog front-end op-amps. Use Value: 120 mV dropout and 160 µA quiescent current enable >100-hour runtime on two AA cells; 50 ppm/°C TC maintains accuracy across outdoor temperature swings. |
Use Scenario: 4–20 mA loop-powered pressure transmitter with onboard microcontroller and signal chain. IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensor and ADC reference voltage. Use Value: ±5 mA drive capability powers Wheatstone bridge directly; enable pin synchronizes reference activation with measurement cycle to reduce average power. |
| Medical Patient Monitoring | Automotive Cabin Electronics |
|
Use Scenario: Portable ECG monitor digitizing biopotential signals with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Low-noise 2.5 V reference for ADC and analog filter stages. Use Value: 46 µVPP (0.1–10 Hz) noise floor ensures <1 LSB error in 20-bit effective resolution; REF pin isolation prevents EMI coupling into sensitive analog paths. |
Use Scenario: HVAC control module in vehicle cabin requiring reliable operation from 9–16 V battery with thermal cycling. IC Role / Device Role / Timing Role: Precision reference for temperature sensor interface and microcontroller ADC. Use Value: −40°C to +85°C qualification and 50 ppm/°C TC ensure consistent sensor readings across engine-off cold soak and summer heat soak conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C25IDBZR | Shunt reference (2.5 V, ±0.5%, 100 ppm/°C); requires external bias resistor; no enable pin; 60 µA typical cathode current. | Used in fixed-supply systems where VIN is stable and higher than 2.5 V; unsuitable for low-headroom or enable-controlled designs. | Select when board space permits shunt topology and enable functionality is unnecessary - lower cost but higher supply sensitivity. |
| REF3025AIDBZR | Series reference (2.5 V, ±0.2%, 50 ppm/°C); 50 µA supply current; no enable pin; 150 mV dropout at 1 mA. | Higher initial accuracy grade ideal for calibrated test equipment; lacks enable control and has higher dropout than LM4120IM5-2.5. | Choose for metrology-grade accuracy where power-down is not required and 150 mV dropout is acceptable in the supply architecture. |
Compared with LM4120IM5-2.5, LM4040C25IDBZR offers lower cost but demands external biasing and lacks enable control, while REF3025AIDBZR provides tighter initial accuracy but sacrifices power-gating capability and has higher dropout - making LM4120IM5-2.5 optimal for battery-constrained, enable-driven systems needing balanced performance.
Availability
LM4120IM5-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and automotive cabin electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM4120IM5-2.5 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, embedded processing, and connectivity technologies with over 50 years of analog design heritage.
The LM4120 series was developed for precision, low-power voltage referencing in space-constrained, battery-operated systems - emphasizing micropower operation, low dropout, and enable-controlled power gating.
FAQ
What is the guaranteed initial accuracy of LM4120IM5-2.5 over temperature?
The LM4120IM5-2.5 is specified with ±0.5% initial output voltage accuracy at 25°C. This tolerance is maintained across the industrial temperature range (−40°C to +85°C) per TI's SNVS049F datasheet Rev F. The device does not carry the "A" grade suffix (e.g., LM4120AIM5-2.5), which would indicate ±0.2% accuracy.
Can LM4120IM5-2.5 operate from a 2.7 V supply while delivering 2.5 V output?
Yes - LM4120IM5-2.5 supports input voltages as low as 2 V and has a typical dropout voltage of 120 mV at 1 mA load. At 2.7 V input, it sustains regulated 2.5 V output with ≥1.5 mA load current, making it suitable for single-cell Li-ion (2.7–3.6 V) and 2.8 V LDO-fed systems.
Is the REF pin on LM4120IM5-2.5 required to connect externally?
No - the REF pin (Pin 1) on LM4120IM5-2.5 must remain unconnected on the PCB. It is internally tied to the bandgap reference node and highly sensitive to noise and capacitive loading; any external connection degrades accuracy and stability per TI's layout guidelines.
What is the maximum load current LM4120IM5-2.5 can source or sink?
LM4120IM5-2.5 is rated for ±5 mA output current - meaning it can source up to +5 mA into a load or sink up to −5 mA from a load. This bidirectional capability supports active pull-up/pull-down configurations in precision comparator and op-amp bias networks.
Does LM4120IM5-2.5 include built-in power-down functionality?
Yes - LM4120IM5-2.5 features an enable (EN) pin (Pin 3). Pulling EN to GND disables the output and reduces supply current to <2 µA, enabling system-level power gating. For always-on operation, EN may be tied directly to VIN without additional components.
LM4120IM5-2.5 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:
- ±0.5%
- 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
LM4120IM5-2.5 FAQ
1.How can I place an order for LM4120IM5-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5-2.5 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 LM4120IM5-2.5 reliable?
The price and inventory of LM4120IM5-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5-2.5 is usually 5 days.
3.What payment methods are accepted for LM4120IM5-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5-2.5?
LM4120IM5-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5-2.5 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 LM4120IM5-2.5?
For technical support, including LM4120IM5-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5-2.5 requirements.
6.How does Aetrix verify that LM4120IM5-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4120IM5-2.5 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 LM4120IM5-2.5 meets industry standards.
7.What is the process for return or replacement of LM4120IM5-2.5?
All LM4120IM5-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5-2.5, 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 LM4120IM5-2.5 part is unused and in its original packaging.
Return procedure for LM4120IM5-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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