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Texas Instruments LM4120IM5X-5.0/NOPB
- Part No.:
- LM4120IM5X-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-5.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,197
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Product details
Overview
LM4120IM5X-5.0/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 5.0 V output with ±0.5% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load - designed for battery-powered instrumentation, portable medical devices, and industrial data acquisition systems requiring stable, low-power reference performance.
For engineers reviewing the LM4120IM5X-5.0/NOPB datasheet, LM4120IM5X-5.0/NOPB pinout, LM4120IM5X-5.0/NOPB application, or LM4120IM5X-5.0/NOPB equivalent, key selection considerations include enable-controlled power-down (ISS < 2 µA), ±5 mA source/sink capability, SOT-23-5 package compatibility, and guaranteed performance across −40°C to +85°C.
Technical Context
The LM4120IM5X-5.0/NOPB implements a bandgap-based reference core with integrated enable control logic and low-impedance output buffer. Its architecture supports operation from VIN = 2 V to 12 V while maintaining regulation down to VIN − VOUT = 120 mV (typ) at 1 mA - enabling use in ultra-low-headroom applications such as single-cell Li-ion or coin-cell powered systems.
It features a dedicated REF pin (unconnected, noise-sensitive), GND-referenced enable input with TTL/CMOS-compatible thresholds (VH = 2.4 V, VL = 0.4 V), and internal thermal hysteresis of ≤0.5 mV/V over −40°C to +125°C - ensuring stability during thermal cycling in embedded industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±0.5% (initial accuracy at 25°C; A-grade variant offers ±0.2%) |
| Temperature Coefficient | 50 ppm/°C (ensured over −40°C to +125°C; critical for precision sensor biasing) |
| Dropout Voltage | 120 mV typical at 1 mA load (enables operation with VIN as low as 5.12 V) |
| Supply Current | 160 µA typical (supports >1-year battery life in 10-µA sleep-mode systems) |
| Power-Down Current | <2 µA when EN = GND (reduces system standby power by >98% vs active mode) |
| Output Drive | ±5 mA source/sink (directly drives ADC reference inputs, op-amp bias networks, or DAC buffers) |
| Noise (0.1–10 Hz) | 20 µVPP (low-noise performance suitable for 16-bit+ data converters) |
Pinout & Package
LM4120IM5X-5.0/NOPB is housed in a standard 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, optimized for space-constrained PCB layouts and compatible with automated pick-and-place assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Must remain unconnected; sensitive to noise and capacitive loading - requires isolation in layout |
| 2 - GND | Ground reference | Return path for supply current and load current; connects to system ground plane |
| 3 - EN | Enable control input | Analog input; pulled high to VIN for normal operation, grounded to disable output and reduce current to <2 µA |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; minimum headroom 120 mV above VOUT for regulation |
| 5 - VOUT | Regulated reference output | 5.0 V ±0.5%, capable of sourcing or sinking up to ±5 mA into external circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces quiescent current to <2 µA - essential for intermittent-sampling IoT sensors |
| Low dropout operation | 120 mV typical at 1 mA enables use with single Li-ion (3.0–4.2 V) or 5-V rail with minimal margin |
| High output drive | ±5 mA capability eliminates need for external buffer op-amps in most ADC/DAC reference paths |
| Stable with ceramic capacitors | Works with 0.022 µF–0.047 µF ceramic output caps - simplifies BOM and reduces board area |
| Industrial temperature range | Specified from −40°C to +85°C - validated for deployment in factory automation and outdoor equipment |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered ECG front-end with 24-bit delta-sigma ADC requiring stable reference under varying battery voltage. IC Role / Device Role / Timing Role: Precision 5.0 V reference for ADC full-scale calibration and sensor excitation. Use Value: 50 ppm/°C drift and 20 µVPP low-frequency noise preserve effective resolution across operating temperature range. |
Use Scenario: Modular PLC analog input module measuring 4–20 mA loop signals with cold-junction compensation. IC Role / Device Role / Timing Role: Reference for precision PGA and sigma-delta converter; supplies bias to thermocouple amplifier. Use Value: ±5 mA drive supports simultaneous reference distribution to multiple signal chains without gain error. |
| Automotive Body Control | Test & Measurement Equipment |
Use Scenario: Low-power door module monitoring window position via resistive divider and SAR ADC. IC Role / Device Role / Timing Role: Enable-controlled reference activated only during measurement bursts to minimize average current draw. Use Value: <2 µA shutdown current extends vehicle parasitic drain budget compliance for 10-year service life. |
Use Scenario: Benchtop multimeter reference subsystem requiring traceable 5.0 V source with long-term stability. IC Role / Device Role / Timing Role: Primary voltage reference for auto-ranging DMM front-end and calibration memory checksum verification. Use Value: 100 ppm long-term stability (1000 hrs @ 25°C) ensures calibration validity between annual service intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4120AIM5X-5.0/NOPB | ±0.2% initial accuracy (vs ±0.5% for LM4120IM5X-5.0/NOPB); same package, tempco, and electrical specs | Suitable where tighter initial tolerance is required for factory calibration or high-accuracy sensor offset trimming | Select when absolute initial accuracy outweighs cost sensitivity; identical footprint and layout |
| REF3050AIDBZR | Lower 20 ppm/°C tempco, higher 4.5 µA supply current, no enable pin, SOT-23-3 package | Better thermal stability but lacks power-gating - unsuitable for duty-cycled systems requiring ultra-low standby current | Choose for static, mains-powered instruments prioritizing drift over power; requires PCB redesign due to 3-pin footprint |
Compared with LM4120AIM5X-5.0/NOPB and REF3050AIDBZR, the LM4120IM5X-5.0/NOPB uniquely balances moderate accuracy (±0.5%), ultra-low shutdown current (<2 µA), and 5-pin SOT-23 compatibility - making it optimal for cost-sensitive, battery-operated systems needing reliable enable control without sacrificing long-term stability.
Availability
LM4120IM5X-5.0/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, and automotive body control units requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4120IM5X-5.0/NOPB 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 for industrial, automotive, and personal electronics markets.
The LM4120 series was developed to deliver micropower, low-dropout voltage references for space- and energy-constrained applications - emphasizing enable control, wide input range, and robust thermal performance in compact SOT-23 packaging.
FAQ
What is the maximum input voltage rating for LM4120IM5X-5.0/NOPB?
The absolute maximum input voltage for LM4120IM5X-5.0/NOPB is 14 V, as specified in the Absolute Maximum Ratings table. Operation beyond this level risks permanent damage. For reliable long-term use, TI recommends staying within the recommended operating condition of VIN ≤ 12 V, especially when ambient temperature exceeds 85°C.
Does LM4120IM5X-5.0/NOPB require an external output capacitor?
Yes - LM4120IM5X-5.0/NOPB requires a minimum 0.022 µF ceramic output capacitor for loop stability. Values up to 0.047 µF ceramic are fully supported; larger values (up to 1 µF) require tantalum construction and additional layout precautions per Section 8.1 of the datasheet. Omitting COUT risks oscillation or poor transient response.
Can the REF pin of LM4120IM5X-5.0/NOPB be connected to ground or left floating?
Neither - the REF pin of LM4120IM5X-5.0/NOPB must remain unconnected (open) in all configurations. It is internally connected to a high-impedance node and highly sensitive to noise and capacitive loading. Connecting it to ground or any other node will degrade accuracy, increase noise, and may cause instability per Section 7.3.2 and Figure 29 layout guidance.
What is the typical startup time for LM4120IM5X-5.0/NOPB after enabling?
The typical startup time for LM4120IM5X-5.0/NOPB is 100 µs from EN rising to VIN until VOUT reaches 99% of 5.0 V, as shown in Figure 30 (Start-Up Response). This timing holds across −40°C to +85°C and is independent of load current up to 5 mA, supporting fast wake-up in microcontroller-based sampling systems.
Is LM4120IM5X-5.0/NOPB RoHS compliant and lead-free?
Yes - LM4120IM5X-5.0/NOPB is RoHS compliant and lead-free, as confirmed in the Packaging Information table (Addendum-Page 1): "Green (RoHS & no Sb/Br)" eco plan with "SN" (matte tin) lead finish and MSL Level-1 rating. The "/NOPB" suffix explicitly denotes lead-free packaging per TI's ordering nomenclature.
LM4120IM5X-5.0/NOPB 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):
- 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
LM4120IM5X-5.0/NOPB FAQ
1.How can I place an order for LM4120IM5X-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-5.0/NOPB 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 LM4120IM5X-5.0/NOPB reliable?
The price and inventory of LM4120IM5X-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5X-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-5.0/NOPB?
LM4120IM5X-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-5.0/NOPB 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 LM4120IM5X-5.0/NOPB?
For technical support, including LM4120IM5X-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-5.0/NOPB requirements.
6.How does Aetrix verify that LM4120IM5X-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-5.0/NOPB 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 LM4120IM5X-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-5.0/NOPB?
All LM4120IM5X-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-5.0/NOPB, 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 LM4120IM5X-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5X-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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