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Texas Instruments LM4120IM5X-3.0
- Part No.:
- LM4120IM5X-3.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-3.0.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,765
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Product details
Overview
LM4120IM5X-3.0 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 3.0 V ±0.2% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load - designed for high-stability analog signal chains in battery-powered instrumentation and portable medical devices.
For engineers reviewing the LM4120IM5X-3.0 datasheet, LM4120IM5X-3.0 pinout, LM4120IM5X-3.0 application, or LM4120IM5X-3.0 equivalent, key selection criteria include enable-controlled power-down (≤2 µA), ±5 mA source/sink capability, SOT-23-5 package compatibility, and industrial temperature operation (−40°C to 85°C) with guaranteed 50 ppm/°C drift.
Technical Context
The LM4120IM5X-3.0 implements a bandgap-based reference core with integrated enable control and low-impedance output buffer. Its architecture supports operation from VIN = VOUT + 120 mV up to 12 V while maintaining regulation across −40°C to 85°C.
It features an analog enable input requiring ~6 µA to activate, logic-level thresholds (VH = 2.4 V, VL = 0.4 V), and a dedicated unconnected REF pin sensitive to noise and capacitive loading - necessitating careful PCB layout isolation per TI's mechanical stress mitigation guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V ±0.2% (A-grade initial accuracy - enables 12-bit ADC biasing without calibration) |
| Temperature Coefficient | 50 ppm/°C (ensured over −40°C to 125°C - supports stable performance in automotive under-hood environments) |
| Dropout Voltage | 120 mV typical at 1 mA (allows regulation from 3.12 V supply - critical for single-cell Li-ion or coin-cell systems) |
| Supply Current | 160 µA typical (enables >1-year battery life in 10-µA sleep-mode IoT sensors) |
| Power-Down Current | <2 µA (achieved by pulling EN to GND - reduces standby loss in always-on monitoring nodes) |
| Output Drive | ±5 mA (supports direct driving of SAR ADC reference inputs or op-amp bias networks without buffering) |
| Line Regulation | 0.008%/V (limits output shift to <240 µV over 3.3–12 V input range - suitable for unregulated battery rails) |
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 - internal connection to bandgap core; external connection causes instability and accuracy loss |
| 2 - GND | Ground return | Primary current return path for load, supply, and enable - requires low-impedance PCB plane connection |
| 3 - EN | Enable control | Analog input; ≥2.4 V enables output, ≤0.4 V disables output; 6 µA typical activation current |
| 4 - VIN | Input supply | Accepts 3.12 V to 12 V; must exceed VOUT by ≥120 mV for regulation; bypass capacitor recommended |
| 5 - VOUT | Reference output | 3.0 V regulated output; capable of sourcing/sinking ±5 mA; requires 0.022–0.047 µF ceramic capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces quiescent current to <2 µA - extends battery life in duty-cycled data loggers |
| Low dropout voltage | 120 mV at 1 mA enables use with 3.3 V LDOs or single-cell LiFePO₄ supplies |
| High output drive | ±5 mA sink/source eliminates need for external buffer in 12-bit DAC reference paths |
| Low output noise | 36 µVPP (10 Hz–10 kHz) supports precision weigh-scale and medical ECG front-ends |
| Thermal hysteresis | 0.5 mV/V ensures repeatable accuracy after thermal cycling in industrial control enclosures |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with 16-bit ADC sampling analog sensor output. IC Role / Device Role / Timing Role: Precision 3.0 V reference for ADC voltage scaling and sensor excitation. Use Value: ±0.2% initial accuracy and 50 ppm/°C drift ensure <0.05% total error over operating temperature - meeting ISO 15197 clinical accuracy requirements. |
Use Scenario: Remote environmental sensor node powered by CR2032 coin cell, logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Reference for microcontroller ADC and low-power op-amp signal conditioning. Use Value: 160 µA supply current and enable-controlled shutdown reduce average system current to <1 µA in sleep - enabling 3+ years of operation on one battery. |
| Industrial Process Transmitters | Automotive Body Control Modules |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in −40°C to 85°C ambient. IC Role / Device Role / Timing Role: Stable 3.0 V reference for DAC output scaling and sensor bridge excitation. Use Value: Guaranteed 50 ppm/°C drift over full industrial range ensures <±0.3% span error across temperature - compliant with IEC 61000-6-2 EMC immunity requirements. |
Use Scenario: In-cabin occupancy detection module using capacitive sensing, powered from 5 V vehicle rail. IC Role / Device Role / Timing Role: Low-noise 3.0 V reference for high-resolution capacitance-to-digital converter (CDC). Use Value: 36 µVPP broadband noise prevents false triggers in sub-femtofarad sensing - critical for occupant classification reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AUT30+ | 0.1% initial accuracy, 3 ppm/°C TC, 65 µA supply current, no enable pin | Lacks power-down mode; superior TC but higher cost and fixed 3.0 V only | Preferred when ultra-low drift dominates over power management needs |
| ADR3430ARJZ-R7 | 0.1% initial accuracy, 20 ppm/°C TC, 120 µA supply current, enable pin included | Lower TC and supply current than LM4120IM5X-3.0, but larger SOT-23-6 footprint | Chosen when tighter long-term stability and lower power are required, and board space allows 6-pin layout |
Compared with MAX6126AUT30+ and ADR3430ARJZ-R7, the LM4120IM5X-3.0 offers the best balance of enable functionality, SOT-23-5 compactness, and A-grade 0.2% accuracy at cost-sensitive industrial volumes - making it optimal for space-constrained, battery-aware designs where moderate TC is acceptable.
Availability
LM4120IM5X-3.0 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial process transmitters requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4120IM5X-3.0 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and high-volume manufacturing.
The LM4120 product line delivers micropower, low-dropout voltage references optimized for battery-operated instrumentation, portable test equipment, and industrial control systems demanding accuracy, stability, and small-footprint integration.
FAQ
What is the maximum input voltage rating for the LM4120IM5X-3.0?
The absolute maximum input voltage for the LM4120IM5X-3.0 is 14 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable continuous operation, TI recommends staying within the Recommended Operating Conditions: VIN ≤ 12 V, with minimum VIN = VOUT + 120 mV (i.e., ≥3.12 V for the LM4120IM5X-3.0). Exceeding 12 V may degrade long-term stability even if below 14 V.
Does the LM4120IM5X-3.0 require an external output capacitor, and what value is recommended?
Yes, the LM4120IM5X-3.0 requires an external output capacitor for stability and transient response. TI specifies a minimum of 0.022 µF ceramic capacitor, with optimal range 0.022–0.047 µF. Capacitors larger than 0.047 µF must be tantalum (not ceramic), and values ≥1 µF require an additional 50-pF capacitor between VOUT and the unconnected REF pin. Ceramic capacitors outside the 0.022–0.047 µF range risk oscillation or degraded load step response.
How does the enable pin function on the LM4120IM5X-3.0, and what are its voltage thresholds?
The enable pin (Pin 3) controls device startup and shutdown. It functions as an analog input: applying ≥2.4 V (typical) relative to GND enables normal operation, while pulling ≤0.4 V (typical) disables output and reduces supply current to <2 µA. The pin draws ~6 µA during turn-on. Floating the pin is not recommended; if unused, connect directly to VIN. TI specifies logic thresholds over −40°C to 85°C, with worst-case VL = 0.2 V and VH = 2.4 V.
Can the LM4120IM5X-3.0 be used in applications requiring operation beyond 85°C ambient temperature?
The LM4120IM5X-3.0 is characterized and guaranteed over the industrial temperature range of −40°C to 85°C. While some parameters (e.g., temperature coefficient) are ensured up to 125°C junction temperature, full electrical specifications - including initial accuracy, dropout, and load regulation - are not guaranteed above 85°C ambient. For extended-range operation, TI offers custom screening or contact-based qualification; standard LM4120IM5X-3.0 shipments are rated only to 85°C ambient.
What is the purpose of the REF pin on the LM4120IM5X-3.0, and how should it be handled on the PCB?
The REF pin (Pin 1) is an internal bandgap reference node and must remain unconnected in all applications. TI explicitly states that connecting or routing traces to this pin introduces noise sensitivity and capacitive loading that degrades accuracy and stability. During PCB layout, isolate the REF pad with clearance voids, avoid nearby vias or copper pours, and maintain >1 mm distance from other signals - especially clocks and switching nodes - to prevent coupling-induced output errors in the LM4120IM5X-3.0.
LM4120IM5X-3.0 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):
- 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
LM4120IM5X-3.0 FAQ
1.How can I place an order for LM4120IM5X-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-3.0 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-3.0 reliable?
The price and inventory of LM4120IM5X-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5X-3.0 is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-3.0?
LM4120IM5X-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-3.0 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-3.0?
For technical support, including LM4120IM5X-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-3.0 requirements.
6.How does Aetrix verify that LM4120IM5X-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-3.0 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-3.0 meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-3.0?
All LM4120IM5X-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-3.0, 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-3.0 part is unused and in its original packaging.
Return procedure for LM4120IM5X-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5X-3.0 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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