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Texas Instruments LM4120IM5X-1.8
- Part No.:
- LM4120IM5X-1.8
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-1.8.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,406
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Product details
Overview
LM4120IM5X-1.8 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 - used as a stable reference in portable battery-powered instrumentation and data acquisition systems.
For engineers reviewing the LM4120IM5X-1.8 datasheet, LM4120IM5X-1.8 pinout, LM4120IM5X-1.8 application, or LM4120IM5X-1.8 equivalent, key selection considerations include enable-controlled power-down (ISS < 2 µA), ±5 mA source/sink capability, SOT-23-5 package compatibility, and industrial temperature range (−40°C to 85°C) operation.
Technical Context
The LM4120IM5X-1.8 implements a bandgap-based reference core with integrated enable control and low-quiescent-current biasing. Its architecture supports operation from VIN = 2 V to 12 V while maintaining regulation down to VIN − VOUT = 120 mV (typ.) at 1 mA.
It features an analog enable input requiring ~6 µA to activate, logic-level thresholds (VL ≤ 0.4 V, VH ≥ 2.4 V), and a dedicated unconnected REF pin sensitive to noise and capacitive loading - all optimized for stability with 0.022–0.047 µF ceramic output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.5% initial accuracy over −40°C to 85°C - ensures stable ADC/DAC reference without calibration in cost-sensitive industrial designs. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - limits output drift to ≤90 µV/°C across full extended range, critical for precision sensor signal chains. |
| Dropout Voltage | 120 mV typical at 1 mA load - enables regulation from 1.92 V input, supporting single-cell LiFePO₄ or dual-cell alkaline supply rails. |
| Supply Current | 160 µA typical (275 µA max at −40°C to 85°C) - extends battery life in always-on monitoring nodes with multi-year runtime requirements. |
| Power-Down Current | <2 µA when EN ≤ 0.4 V - reduces standby consumption by >98% versus active mode, essential for intermittent-sampling architectures. |
| Output Drive | ±5 mA source/sink capability - directly drives ADC reference inputs, op-amp bias networks, or small DAC loads without external buffering. |
| Noise (0.1–10 Hz) | 20 µVPP - low flicker noise preserves SNR in high-resolution (≥16-bit) data acquisition front-ends. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, tape-and-reel (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Must remain unconnected; sensitive to noise and capacitive loading - requires PCB isolation and no trace routing nearby. |
| 2 - GND | Ground reference | Primary return path for load current and internal bias; must connect to low-impedance ground plane to minimize PSRR degradation. |
| 3 - EN | Enable control input | Analog input with ~6 µA activation current; pulled to VIN for normal operation, grounded for shutdown - not TTL/CMOS buffered. |
| 4 - VIN | Input supply | Accepts 2 V to 12 V; minimum headroom defined by dropout voltage - bypass with 0.1 µF ceramic if line transients present. |
| 5 - VOUT | Regulated output | 1.8 V precision reference; stable with 0.022–0.047 µF ceramic capacitor - larger values require tantalum and REF-pin decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to <2 µA, enabling ultra-low-power sleep modes in portable instrumentation and wireless sensors. |
| Low dropout (120 mV @ 1 mA) | Permits operation from marginal input rails - e.g., 1.9 V Li-ion at end-of-discharge - without loss of regulation or accuracy. |
| ±5 mA output drive | Eliminates need for external buffer amplifiers when driving 12-bit+ SAR ADC references or precision op-amp bias networks. |
| 0.5% initial accuracy (standard grade) | Meets mid-tier precision requirements for industrial process controllers and battery fuel gauges without factory trimming. |
| 50 ppm/°C tempco | Ensures ≤0.09% output variation over −40°C to 85°C - sufficient for medical thermistor interfaces and environmental monitors. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure at 1-minute intervals. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for 16-bit sigma-delta ADC and microcontroller VREF input. Use Value: Enables 12-month battery life via 160 µA active current and <2 µA shutdown, while maintaining ±0.5% measurement accuracy across −25°C to 60°C ambient. |
Use Scenario: 4–20 mA loop-powered transmitter conditioning RTD and thermocouple signals in factory automation. IC Role / Device Role / Timing Role: Supplies precision reference for analog front-end gain/offset calibration and ADC conversion. Use Value: Delivers 50 ppm/°C stability over −40°C to 85°C, ensuring transmitter output error remains within 0.1% FS across operating temperature range. |
| Medical Patient Monitors | Automotive Body Control Modules |
Use Scenario: Portable ECG device acquiring biopotential signals with 24-bit resolution and real-time digital filtering. IC Role / Device Role / Timing Role: Low-noise (20 µVPP) 1.8 V reference for high-resolution ADC and analog signal chain biasing. Use Value: Preserves SNR > 100 dB by minimizing reference-induced noise floor elevation in differential input stages. |
Use Scenario: Low-power interior lighting controller using PWM dimming and LIN bus communication. IC Role / Device Role / Timing Role: Supplies regulated 1.8 V for MCU I/O and LIN transceiver reference, enabled only during active communication bursts. Use Value: Reduces system standby current by 150 µA per module via EN-controlled shutdown, extending vehicle parasitic draw compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4120AIM5X-1.8/NOPB | A-grade version with ±0.2% initial accuracy (vs. ±0.5% for LM4120IM5X-1.8); identical pinout, package, and electrical specs otherwise. | Suitable where tighter initial tolerance is required for calibration-free designs - e.g., portable test equipment or high-accuracy data loggers. | Select LM4120AIM5X-1.8/NOPB when 0.2% accuracy justifies premium cost; LM4120IM5X-1.8/NOPB remains optimal for cost-sensitive industrial controls. |
| MAX6029AEUR+T | 1.8 V reference with ±0.2% accuracy, 25 ppm/°C tempco, 12 µA quiescent current - lower power but no enable pin or sink capability. | Better suited for always-on ultra-low-power applications (e.g., IoT endpoint sensors), but lacks shutdown control and bidirectional drive. | Choose MAX6029AEUR+T only when sub-20 µA supply current is mandatory and enable functionality is unnecessary. |
Compared with LM4120AIM5X-1.8/NOPB, the LM4120IM5X-1.8/NOPB trades 0.3% initial accuracy for lower cost while retaining identical enable control, ±5 mA drive, and industrial temperature support; versus MAX6029AEUR+T, it offers superior load flexibility and power-state management at higher quiescent current.
Availability
LM4120IM5X-1.8 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and automotive body control modules requiring stable component supply with consistent lead times and volume pricing.
Supply support for LM4120IM5X-1.8 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer design expertise.
The LM4120 series was developed to deliver precision, low-power, enable-capable voltage references in compact SOT-23 packages for space-constrained battery-operated and industrial systems.
FAQ
What is the maximum input voltage rating for LM4120IM5X-1.8?
The absolute maximum input voltage for LM4120IM5X-1.8 is 14 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term use, VIN should be kept within the recommended 2 V to 12 V range, with sufficient margin above the 120 mV typical dropout voltage to maintain regulation under load.
Does LM4120IM5X-1.8 require an external output capacitor, and what value is recommended?
Yes, LM4120IM5X-1.8 requires an external output capacitor for stability and transient response. The datasheet specifies a minimum of 0.022 µF ceramic capacitor, with optimal performance achieved using 0.022–0.047 µF X7R or C0G types. Larger values (up to 1 µF) are permitted only with tantalum dielectrics and require an additional 50-pF capacitor between VOUT and the unconnected REF pin.
Can LM4120IM5X-1.8 both source and sink current, and what are the limits?
Yes, LM4120IM5X-1.8 provides bidirectional output drive: it can source up to +5 mA and sink up to −5 mA while maintaining output accuracy within specification. This capability allows direct interfacing with ADC reference inputs, op-amp feedback networks, and digital logic biasing without external buffers - verified across the full −40°C to 85°C industrial temperature range.
What is the function of the REF pin on LM4120IM5X-1.8, and how should it be handled?
The REF pin on LM4120IM5X-1.8 is an internal bandgap reference node that must remain unconnected in all applications. It is highly sensitive to noise and capacitive loading; routing traces to or near this pin, or placing vias or components adjacent to it, can degrade accuracy and stability. PCB layout guidelines require complete isolation of the REF pin area, including removal of ground or power planes beneath its pad.
How does the enable pin (EN) operate on LM4120IM5X-1.8, and what are its voltage thresholds?
The EN pin on LM4120IM5X-1.8 is an analog input controlling device state: pulling EN ≥ 2.4 V (logic high) enables normal operation; pulling EN ≤ 0.4 V (logic low) forces shutdown with ISS < 2 µA. It draws ~6 µA during turn-on and has minimal hysteresis - floating EN is not allowed. For non-shutdown use, EN may be tied directly to VIN.
LM4120IM5X-1.8 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
LM4120IM5X-1.8 FAQ
1.How can I place an order for LM4120IM5X-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-1.8 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-1.8 reliable?
The price and inventory of LM4120IM5X-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5X-1.8 is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-1.8?
LM4120IM5X-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-1.8 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-1.8?
For technical support, including LM4120IM5X-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-1.8 requirements.
6.How does Aetrix verify that LM4120IM5X-1.8 is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-1.8 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-1.8 meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-1.8?
All LM4120IM5X-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-1.8, 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-1.8 part is unused and in its original packaging.
Return procedure for LM4120IM5X-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5X-1.8 Tags
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TL431AIDBZR
Texas Instruments
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