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Texas Instruments LM4120IM5-1.8/NOPB
- Part No.:
- LM4120IM5-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
LM4120IM5-1.8/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 1.8 V output with ±0.5% 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 operates from 2 V to 12 V input across −40°C to 85°C - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4120IM5-1.8/NOPB datasheet, LM4120IM5-1.8/NOPB pinout, LM4120IM5-1.8/NOPB application, or LM4120IM5-1.8/NOPB equivalent, key selection criteria include dropout voltage under light load, power-down current (<2 µA), thermal hysteresis (0.5 mV/V), noise performance (36 µVPP, 10 Hz–10 kHz), and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4120IM5-1.8/NOPB implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling stable 1.8 V output with minimal headroom. Its enable pin controls analog startup/shutdown with logic-compatible thresholds (VH = 2.4 V, VL = 0.4 V) and <6 µA activation current.
It operates in two functional modes: normal regulation (EN tied to VIN) and power-down (EN grounded), reducing supply current to ≤2 µA. The REF pin is internally connected and must remain unconnected externally to avoid noise coupling or capacitive loading effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±0.5% initial accuracy - ensures stable ADC/DAC reference without trimming in cost-sensitive industrial designs. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - guarantees ≤0.9 mV drift over full industrial range, critical for precision sensor signal chains. |
| Dropout Voltage | 120 mV typical at 1 mA - enables operation from single-cell Li-ion (3.0 V min) or 2xAA (2.4 V) supplies with margin. |
| Supply Current | 160 µA typical - supports multi-year battery life in always-on monitoring nodes with 10 µA average system budget. |
| Power-Down Current | <2 µA - reduces quiescent draw by >98% during sleep cycles, essential for duty-cycled IoT endpoints. |
| Output Noise | 36 µVPP (10 Hz–10 kHz) - meets SNR requirements for 12-bit+ data converters without external filtering. |
| Load Drive | ±5 mA source/sink - directly drives op-amp inputs, SAR ADC references, or small logic loads without buffering. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, tape-and-reel (1000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Internally connected; must remain unconnected on PCB to prevent noise injection and ensure specified stability. |
| 2 - GND | Ground return | Primary current return path for load, supply, and enable; requires low-impedance connection to minimize ground bounce. |
| 3 - EN | Enable control | Analog input: ≥2.4 V enables regulation; ≤0.4 V disables output and reduces IQ to <2 µA - compatible with standard CMOS outputs. |
| 4 - VIN | Input supply | Accepts 2 V to 12 V; minimum headroom defined by dropout voltage - no external bypass required but 0.1 µF ceramic improves transient immunity. |
| 5 - VOUT | Reference output | Stable 1.8 V source/sink node; requires 0.022–0.047 µF ceramic capacitor for guaranteed loop stability per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout | 120 mV at 1 mA enables use with ultra-low-input supplies while maintaining regulation - avoids need for boost converters in energy-harvesting systems. |
| Enable Control | Logic-level compatible EN pin allows synchronized shutdown of reference and downstream circuitry, simplifying power sequencing in multi-rail systems. |
| Micropower Operation | 160 µA typical supply current supports battery life extension in portable medical devices where 10-year shelf life is required. |
| Thermal Hysteresis | 0.5 mV/V ensures repeatable output after thermal cycling - critical for calibration-critical test equipment operating across environmental chambers. |
| Output Noise | 36 µVPP (10 Hz–10 kHz) provides sufficient clean headroom for 12-bit SAR ADCs without additional LDO filtering, reducing BOM count. |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC requiring stable 1.8 V reference across 0–50°C ambient range. IC Role / Device Role / Timing Role: Precision voltage reference providing excitation and conversion reference for analog front-end and ADC. Use Value: 50 ppm/°C TC and 0.5% initial accuracy eliminate field recalibration; 120 mV dropout allows direct use of 2.4 V alkaline supply. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 minutes using coin-cell battery. IC Role / Device Role / Timing Role: Low-quiescent reference enabling accurate sensor biasing and ADC reference during active measurement bursts. Use Value: 160 µA operating current + <2 µA shutdown current extends 220 mAh CR2032 battery life beyond 5 years at 1% duty cycle. |
| Industrial Process Transmitters | Medical Wearables |
|
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation, operating in −40°C to 85°C enclosures. IC Role / Device Role / Timing Role: Primary reference for DAC generating loop current and for internal diagnostics ADC. Use Value: Guaranteed −40°C to 85°C operation and 0.5 mV/V thermal hysteresis ensure long-term calibration stability in unattended installations. |
Use Scenario: ECG patch with integrated analog front-end and Bluetooth LE radio, powered by rechargeable Li-Poly cell. IC Role / Device Role / Timing Role: Reference for biopotential amplifier gain setting and ADC conversion in ultra-low-power sleep/wake cycles. Use Value: Enable pin synchronizes reference activation with measurement window, eliminating standby leakage and improving signal-to-noise ratio. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C18IDBZR | Shunt reference (2-terminal), 1.8 V, ±0.5%, 100 ppm/°C, no enable, 60 µA typical cathode current. | Requires external bias resistor; unsuitable for low-headroom or shutdown-capable designs. | Select when board space permits shunt topology and enable functionality is unnecessary. |
| REF3018AIDBZR | Series reference, 1.8 V, ±0.2%, 50 ppm/°C, 50 µA IQ, no enable, SOT-23-5. | Higher initial accuracy but lacks power-down mode - increases system standby power by ~110 µA vs LM4120IM5-1.8/NOPB. | Select when highest initial accuracy is prioritized over dynamic power control in always-on systems. |
Compared with LM4120IM5-1.8/NOPB, LM4040C18IDBZR requires higher minimum operating current and lacks enable control, while REF3018AIDBZR offers tighter initial tolerance but forfeits micropower shutdown - making LM4120IM5-1.8/NOPB optimal for battery-constrained, intermittently active applications.
Availability
LM4120IM5-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process transmitters requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4120IM5-1.8/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 product line delivers micropower, low-dropout voltage references optimized for battery-operated and space-constrained systems where accuracy, stability, and dynamic power control are critical.
FAQ
What is the maximum input voltage rating for LM4120IM5-1.8/NOPB?
The absolute maximum input voltage for LM4120IM5-1.8/NOPB is 14 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term use, the recommended maximum input is 12 V under all conditions including line transients.
Does LM4120IM5-1.8/NOPB require an external output capacitor?
Yes, LM4120IM5-1.8/NOPB requires a minimum 0.022 µF ceramic output capacitor for guaranteed loop stability. The datasheet specifies stable operation with 0.022–0.047 µF ceramic capacitors; larger values (up to 1 µF) are permitted but require tantalum construction and may need additional compensation.
What is the function of the REF pin on LM4120IM5-1.8/NOPB?
The REF pin on LM4120IM5-1.8/NOPB is an internal reference node that must remain unconnected on the PCB. Connecting it to any external node - including ground or capacitors - degrades noise performance, stability, and accuracy due to sensitivity to capacitive loading and noise coupling.
How does the enable pin behave during power-up of LM4120IM5-1.8/NOPB?
During power-up, the LM4120IM5-1.8/NOPB requires the EN pin to reach ≥2.4 V (logic high) before regulation begins. The enable pin draws ~6 µA during startup; a minimum slew rate of 0.003 V/µs is recommended to prevent output glitches. Floating EN is not allowed - tie to VIN for always-on operation.
Is LM4120IM5-1.8/NOPB suitable for automotive applications?
LM4120IM5-1.8/NOPB is rated for −40°C to +85°C operation and is not AEC-Q200 qualified. While it functions within standard automotive cabin temperature ranges, TI does not recommend it for safety-critical or under-hood automotive applications without additional qualification testing and derating.
LM4120IM5-1.8/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:
- ±0.5%
- 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
LM4120IM5-1.8/NOPB FAQ
1.How can I place an order for LM4120IM5-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5-1.8/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 LM4120IM5-1.8/NOPB reliable?
The price and inventory of LM4120IM5-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5-1.8/NOPB?
LM4120IM5-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5-1.8/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 LM4120IM5-1.8/NOPB?
For technical support, including LM4120IM5-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5-1.8/NOPB requirements.
6.How does Aetrix verify that LM4120IM5-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5-1.8/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 LM4120IM5-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5-1.8/NOPB?
All LM4120IM5-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5-1.8/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 LM4120IM5-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5-1.8/NOPB Tags
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