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Texas Instruments LM4120AIM5X-1.8/NOPB
- Part No.:
- LM4120AIM5X-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5X-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,242
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Product details
Overview
LM4120AIM5X-1.8/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 1.8 V output with ±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 sensing in battery-powered instrumentation.
For engineers reviewing the LM4120AIM5X-1.8/NOPB datasheet, LM4120AIM5X-1.8/NOPB pinout, LM4120AIM5X-1.8/NOPB application, or LM4120AIM5X-1.8/NOPB equivalent, key selection criteria include industrial-temp (−40°C to 85°C) operation, SOT-23-5 package compatibility, power-down current <2 μA, and fixed 1.8 V output without external trimming.
Technical Context
The LM4120AIM5X-1.8/NOPB implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling stable 1.8 V output across input voltages from 2 V to 12 V. Its enable pin provides analog-controlled shutdown with logic-low threshold ≤0.4 V and logic-high threshold ≥2.4 V.
It operates in two functional modes: normal regulation (Enable = VIN) and power-down (Enable = GND), reducing supply current to ≤2 μA. The REF pin is internally connected and must remain unconnected per design-no external feedback or compensation is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.2% initial accuracy over −40°C to 85°C - enables direct interface with 1.8 V ADCs and precision DACs without calibration. |
| Temperature Coefficient | 50 ppm/°C max (−40°C to 125°C) - ensures ≤0.9 mV drift over full industrial range, critical for portable test equipment stability. |
| Dropout Voltage | 120 mV typical at 1 mA load - allows operation from 1.92 V input, supporting single-cell LiFePO₄ or dual-cell alkaline supplies. |
| Supply Current | 160 μA typical, ≤275 μA max (−40°C to 85°C) - extends battery life in always-on sensor nodes and IoT edge devices. |
| Power-Down Current | ≤2 μA at Enable ≤0.4 V - reduces quiescent consumption by >98% during sleep cycles in duty-cycled systems. |
| Output Drive | ±5 mA source/sink capability - supports driving 10 kΩ loads directly or biasing op-amp reference inputs without buffer stages. |
| Line Regulation | 0.008%/V max (3.3 V to 12 V) - maintains output stability despite input rail variation in unregulated battery or DC-DC post-regulation paths. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Internally connected; must remain unconnected on PCB - prevents noise coupling and capacitive loading that degrades accuracy and stability. |
| 2 - GND | Ground reference | Primary return path for load current and internal bias - requires low-impedance connection to system ground plane to minimize ground bounce errors. |
| 3 - EN | Enable control input | Analog input with 0.4 V low / 2.4 V high thresholds - connects directly to microcontroller GPIO or logic rail for controlled power sequencing. |
| 4 - VIN | Input supply | Accepts 2 V to 12 V input - supports wide-input applications including automotive transients and multi-cell battery stacks. |
| 5 - VOUT | Regulated output | 1.8 V precision reference - delivers stable voltage to ADC references, DAC bias networks, or comparator thresholds with minimal external components. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 120 mV typical at 1 mA enables use with input rails as low as 1.92 V - ideal for energy-constrained battery-powered systems. |
| Enable-Controlled Power-Down | Reduces supply current to ≤2 μA when EN ≤ 0.4 V - supports ultra-low-power sleep modes in portable instrumentation and wireless sensors. |
| High Initial Accuracy | ±0.2% for A-grade devices ensures first-pass calibration success in precision data acquisition and medical monitoring circuits. |
| Wide Input Voltage Range | 2 V to 12 V operation accommodates diverse supply topologies - from single Li-ion cells to industrial 12 V rails without pre-regulation. |
| Source/Sink Capability | ±5 mA output drive eliminates need for external buffers when interfacing with op-amps, ADC references, or digital logic thresholds. |
Applications
| Portable Instrumentation | Battery-Powered Sensors |
|---|---|
|
Use Scenario: Handheld multimeter measuring DC voltage with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Precision 1.8 V reference for ADC full-scale calibration and offset nulling. Use Value: ±0.2% initial accuracy and 50 ppm/°C TC ensure measurement repeatability across temperature without field recalibration. |
Use Scenario: Wireless environmental sensor node logging temperature/humidity with 12-bit ADC. IC Role / Device Role / Timing Role: Stable 1.8 V reference for ADC and microcontroller I/O voltage scaling. Use Value: 160 μA typical supply current and ≤2 μA shutdown extend coin-cell lifetime beyond 5 years in low-duty-cycle deployments. |
| Industrial Process Monitoring | Medical Diagnostic Equipment |
|
Use Scenario: Loop-powered 4–20 mA transmitter with onboard analog front-end. IC Role / Device Role / Timing Role: Low-dropout 1.8 V reference for current-sense amplifier bias and DAC output scaling. Use Value: 120 mV dropout allows operation from 3.3 V supply derived from 24 V loop with minimal headroom loss. |
Use Scenario: Portable ECG monitor requiring stable analog signal chain referencing. IC Role / Device Role / Timing Role: Primary voltage reference for instrumentation amplifier gain-setting and ADC reference. Use Value: 36 µVPP (10 Hz–10 kHz) output noise and thermal hysteresis ≤0.5 mV/V ensure clinical-grade signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3018AIDBVR | 1.8 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 active current is prioritized and enable functionality is unnecessary. |
| ADR3418ARJZ-R7 | 1.8 V, ±0.1%, 10 ppm/°C, 120 μA supply current, no enable pin, SOT-23-5 | Higher accuracy and lower TC, but no enable and higher cost; not rated for −40°C to 125°C TC guarantee | Select when long-term stability and tighter TC are critical, and power-down is managed externally. |
Compared with LM4120AIM5X-1.8/NOPB, REF3018AIDBVR offers lower operating current but forfeits enable control, while ADR3418ARJZ-R7 improves accuracy and TC at the expense of disable capability and extended temperature specification coverage.
Availability
LM4120AIM5X-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and industrial process monitoring requiring stable component supply with guaranteed long-term availability.
Supply support for LM4120AIM5X-1.8/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 power management solutions.
The LM4120 series was designed for high-accuracy, low-power voltage referencing in space-constrained, battery-operated, and industrial environments-emphasizing micropower operation, enable control, and robust thermal performance.
FAQ
What is the maximum input voltage rating for LM4120AIM5X-1.8/NOPB?
The absolute maximum input voltage for LM4120AIM5X-1.8/NOPB is 14 V, as specified in the Absolute Maximum Ratings table. Continuous operation above 12 V is not recommended; the device is characterized for reliable operation from 2 V to 12 V under recommended conditions. Exceeding 14 V risks permanent damage, regardless of duration.
Does LM4120AIM5X-1.8/NOPB require an external output capacitor?
Yes, LM4120AIM5X-1.8/NOPB requires a minimum 0.022 µF ceramic output capacitor for stability, with optimal range 0.022 µF to 0.047 µF. Larger values up to 1 µF are permitted using tantalum capacitors, but require a 50 pF capacitor between VOUT and REF pins. Omitting the output capacitor may cause oscillation or poor transient response.
Can the REF pin of LM4120AIM5X-1.8/NOPB be left floating or connected to ground?
No - the REF pin of LM4120AIM5X-1.8/NOPB must remain unconnected (open) in all applications. It is an internal node sensitive to noise and capacitive loading; connecting it to ground, VOUT, or any other node will degrade accuracy, increase noise, and potentially destabilize regulation. PCB layout must isolate this pin completely.
What is the typical startup time for LM4120AIM5X-1.8/NOPB after enabling?
The typical startup time for LM4120AIM5X-1.8/NOPB is 100 µs from EN rising above 2.4 V to VOUT reaching 99% of 1.8 V, as shown in Figure 14 (Enable Response) of the datasheet. This timing holds across −40°C to 85°C and is independent of load current up to 5 mA, making it suitable for fast wake-up sequences in microcontroller-based systems.
Is LM4120AIM5X-1.8/NOPB qualified for automotive applications?
LM4120AIM5X-1.8/NOPB is specified for the industrial temperature range (−40°C to 85°C) and is not AEC-Q200 qualified. While it operates within automotive ambient ranges, TI does not certify it for automotive safety-critical systems. For automotive use, consult TI's automotive-grade alternatives such as the TLV431B-Q1 or REF5018-Q1.
LM4120AIM5X-1.8/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):
- 1.8V
- 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-1.8/NOPB FAQ
1.How can I place an order for LM4120AIM5X-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5X-1.8/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 LM4120AIM5X-1.8/NOPB reliable?
The price and inventory of LM4120AIM5X-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5X-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120AIM5X-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5X-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5X-1.8/NOPB?
LM4120AIM5X-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5X-1.8/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 LM4120AIM5X-1.8/NOPB?
For technical support, including LM4120AIM5X-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5X-1.8/NOPB requirements.
6.How does Aetrix verify that LM4120AIM5X-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5X-1.8/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 LM4120AIM5X-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120AIM5X-1.8/NOPB?
All LM4120AIM5X-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5X-1.8/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 LM4120AIM5X-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4120AIM5X-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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