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Texas Instruments LM4120IM5-3.3/NOPB
- Part No.:
- LM4120IM5-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,979
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Product details
Overview
LM4120IM5-3.3/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 3.3 V output with ±0.5% initial accuracy, 50 ppm/°C temperature coefficient, 120 mV typical dropout at 1 mA, ±5 mA source/sink capability, and 160 μA typical supply current. It operates from 2 V to 12 V input and supports battery-powered instrumentation requiring stable, low-power reference voltage.
For engineers reviewing the LM4120IM5-3.3/NOPB datasheet, LM4120IM5-3.3/NOPB pinout, LM4120IM5-3.3/NOPB application, or LM4120IM5-3.3/NOPB equivalent, key selection factors include industrial-grade temperature range (−40°C to 85°C), enable-controlled power-down (<2 μA), SOT-23-5 package constraints, and fixed 3.3 V output with verified load/line regulation performance.
Technical Context
The LM4120IM5-3.3/NOPB implements a bandgap-based reference core with integrated enable control and low-impedance output buffer. Its architecture supports operation down to 2 V input while maintaining 3.3 V output stability across −40°C to 85°C ambient, with thermal hysteresis limited to 0.5 mV/V over −40°C to 125°C.
It features dual-mode operation: normal mode (Enable = VIN) delivers full 3.3 V reference with 160 μA supply current; power-down mode (Enable ≤ 0.4 V) reduces supply current to ≤2 μA. The REF pin is internally connected and must remain unconnected externally to avoid noise coupling and capacitive loading effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.5% initial accuracy at 25°C - ensures system-level ADC/DAC reference error remains under ±16.5 mV without calibration. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - contributes ≤±16.5 ppm/°C drift in precision measurement circuits over full extended range. |
| Dropout Voltage | 120 mV typical at 1 mA load - enables stable 3.3 V output from as low as 3.42 V input, critical for single-cell Li-ion or coin-cell applications. |
| Supply Current | 160 μA typical (normal mode); ≤2 μA (power-down) - extends battery life in portable equipment by >80× when disabled. |
| Output Drive | ±5 mA source/sink capability - directly drives 10-bit SAR ADC reference inputs or small op-amp bias networks without external buffering. |
| Line Regulation | 0.008 %/V (3.3 V ≤ VIN ≤ 12 V) - limits output variation to ≤264 μV per volt of input change, supporting unregulated supply rails. |
| Load Regulation | 0.04 %/mA (1–5 mA load range) - maintains output within ±1.32 mV across full rated load, suitable for dynamic sensor excitation. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, lead finish SN (matte tin), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Internally connected; must be left unconnected on PCB to prevent noise injection and capacitive loading that degrades accuracy and stability. |
| 2 - GND | Ground reference | Primary return path for output current and supply current; requires low-impedance connection to system ground plane. |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for activation; ≤0.4 V forces shutdown; 6 μA typical turn-on current enables direct CMOS/TTL interfacing. |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; minimum headroom defined by dropout voltage; bypass capacitor recommended for transient immunity. |
| 5 - VOUT | Reference output | 3.3 V precision output capable of sourcing/sinking ±5 mA; requires 0.022–0.047 µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 120 mV typical at 1 mA - enables operation from marginal input supplies common in energy-harvesting and ultra-low-power systems. |
| Enable-controlled power-down | Reduces supply current to ≤2 μA - allows microcontroller-gated reference activation in duty-cycled sensing nodes. |
| High output accuracy | ±0.5% initial tolerance - eliminates need for post-manufacturing trimming in cost-sensitive industrial sensor modules. |
| Stable with small ceramic capacitors | 0.022 µF minimum COUT - simplifies layout and reduces BOM count versus references requiring tantalum or large ceramics. |
| Industrial temperature range | −40°C to +85°C operation - qualified for use in factory automation controllers, automotive cabin electronics, and outdoor IoT gateways. |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld multimeter measuring DC voltage with 12-bit internal ADC. IC Role / Device Role / Timing Role: Precision 3.3 V reference for ADC full-scale calibration and offset compensation. Use Value: ±0.5% initial accuracy and 50 ppm/°C drift ensure <±0.02% total reference error over operating temperature, meeting Class II meter specifications. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 5 minutes using coin-cell battery. IC Role / Device Role / Timing Role: Enable-gated reference supplying stable 3.3 V only during active ADC conversion and RF transmission. Use Value: 160 μA active current and <2 μA shutdown current extend 220 mAh CR2032 battery life to >5 years at 5-minute wake-up interval. |
| Industrial Process Transmitters | Medical Diagnostic Sensors |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART digital overlay. IC Role / Device Role / Timing Role: Primary voltage reference for DAC generating analog output and for internal signal conditioning circuitry. Use Value: 120 mV dropout allows operation from minimal loop headroom (~3.5 V), while ±5 mA drive supports simultaneous analog and digital circuitry loads. |
Use Scenario: Portable blood glucose meter requiring accurate electrochemical sensor bias and ADC reference. IC Role / Device Role / Timing Role: Low-noise 3.3 V reference for analog front-end amplifiers and 10-bit ADC digitization. Use Value: 36 µVPP (10 Hz–10 kHz) output noise and 0.04 %/mA load regulation minimize measurement uncertainty in sub-millivolt glucose signal detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4120AIM5-3.3/NOPB | ±0.2% initial accuracy (vs. ±0.5%), same package, tempco, and dropout; A-grade variant. | Required where tighter initial tolerance is needed for high-resolution metrology or uncalibrated medical devices. | Select when absolute accuracy at power-up outweighs cost sensitivity; identical pinout and layout compatibility. |
| REF3033AIDBVR | 3.3 V, ±0.2% accuracy, 50 ppm/°C, 165 μA supply, but no enable pin; SOT-23-5 package. | Lacks power-down capability; suited for always-on reference needs in space-constrained industrial controllers. | Choose when enable functionality is unnecessary and higher initial accuracy is mandatory; verify layout compatibility with DBV footprint. |
Compared with LM4120IM5-3.3/NOPB, the LM4120AIM5-3.3/NOPB improves initial accuracy by 0.3% without changing power or thermal behavior, while REF3033AIDBVR trades enable control for tighter tolerance-making each alternative optimal only when its specific advantage aligns with system-level trade-offs in accuracy, power gating, or board area.
Availability
LM4120IM5-3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial process transmitters, and battery-powered data loggers requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4120IM5-3.3/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 and broad industrial portfolio coverage.
The LM4120 series was designed for low-power, high-accuracy voltage referencing in space- and energy-constrained systems, targeting portable test equipment, sensor interfaces, and battery-operated industrial controls.
FAQ
What is the maximum input voltage rating for LM4120IM5-3.3/NOPB?
The absolute maximum input voltage for LM4120IM5-3.3/NOPB is 14 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable continuous operation, the recommended input range is 2 V to 12 V, ensuring proper regulation and thermal safety within the SOT-23-5 package's 350 mW power dissipation limit at 25°C ambient.
Does LM4120IM5-3.3/NOPB require an external output capacitor, and if so, what value?
Yes, LM4120IM5-3.3/NOPB requires an external output capacitor for stability and transient response. The minimum recommended value is 0.022 µF ceramic; typical designs use 0.022 µF to 0.047 µF. Capacitors larger than 0.047 µF must be tantalum, and values up to 1 µF are permissible with appropriate layout precautions. The REF pin must remain unconnected regardless of capacitor choice.
What is the function of the REF pin on LM4120IM5-3.3/NOPB, and how should it be handled?
The REF pin on LM4120IM5-3.3/NOPB is an internal reference node that must remain unconnected on the PCB. It is highly sensitive to noise and capacitive loading; any external connection degrades output accuracy, increases noise, and may cause instability. Layout guidelines explicitly require isolation of this pin from traces, vias, and copper pours to maintain specified 50 ppm/°C temperature coefficient and 36 µVPP noise performance.
How does the enable pin operate on LM4120IM5-3.3/NOPB, and what are its voltage thresholds?
The enable pin (Pin 3) controls normal operation (EN ≥ 2.4 V) or shutdown (EN ≤ 0.4 V). In normal mode, it draws ~6 µA and must be tied to VIN; in shutdown, supply current drops to ≤2 μA. Logic low threshold is 0.4 V (max) at −40°C to 85°C, and logic high threshold is 2.4 V (min). Floating the pin is not permitted - it must be actively driven to avoid undefined states.
Is LM4120IM5-3.3/NOPB suitable for automotive applications?
LM4120IM5-3.3/NOPB is qualified for industrial temperature range (−40°C to +85°C) and is not AEC-Q200 qualified. While it may function in non-safety-critical automotive cabin environments (e.g., infotainment sensors), TI does not specify or guarantee performance for under-hood or ASIL-relevant applications. For automotive-grade alternatives, consult TI's automotive-qualified voltage reference portfolio with explicit AEC-Q200 certification.
LM4120IM5-3.3/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):
- 3.3V
- 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
LM4120IM5-3.3/NOPB FAQ
1.How can I place an order for LM4120IM5-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5-3.3/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 LM4120IM5-3.3/NOPB reliable?
The price and inventory of LM4120IM5-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5-3.3/NOPB?
LM4120IM5-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5-3.3/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 LM4120IM5-3.3/NOPB?
For technical support, including LM4120IM5-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5-3.3/NOPB requirements.
6.How does Aetrix verify that LM4120IM5-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5-3.3/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 LM4120IM5-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5-3.3/NOPB?
All LM4120IM5-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5-3.3/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 LM4120IM5-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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