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Texas Instruments LM4120IM5X-5.0
- Part No.:
- LM4120IM5X-5.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-5.0.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,835
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Product details
Overview
LM4120IM5X-5.0 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 5.0 V ±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 instrumentation, battery-powered data acquisition, and industrial sensor signal chains.
For engineers reviewing the LM4120IM5X-5.0 datasheet, LM4120IM5X-5.0 pinout, LM4120IM5X-5.0 application, or LM4120IM5X-5.0 equivalent, this page provides verified electrical specs, SOT-23-5 terminal mapping, real-world use cases, and two validated alternative parts for design flexibility under industrial temperature constraints (−40°C to 85°C).
Technical Context
The LM4120IM5X-5.0 implements a bandgap-based reference core with integrated enable control, operating from 2 V to 12 V input while maintaining regulation down to 120 mV headroom. Its internal architecture supports bidirectional output current (±5 mA), enabling direct driving of ADC reference inputs or op-amp bias networks without external buffers.
Power-down mode reduces supply current to <2 µA via the enable pin, which requires logic-high ≥2.4 V for activation and ≤0.4 V for shutdown. The REF pin is internally connected and must remain unconnected externally to avoid noise coupling or capacitive loading errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±0.5% initial accuracy at 25°C - ensures ≤25 mV absolute error before calibration in 12-bit+ systems. |
| Temperature Coefficient | 50 ppm/°C over −40°C to 125°C - contributes ≤2.5 mV drift across full industrial range (−40°C to 85°C). |
| Dropout Voltage | 120 mV typical at 1 mA load - allows operation from 5.12 V supply in low-voltage battery systems. |
| Supply Current | 160 µA typical - enables >1-year runtime on a 200 mAh coin cell when active; drops to <2 µA in shutdown. |
| Output Drive | ±5 mA source/sink capability - directly interfaces with SAR ADC reference inputs (e.g., ADS8860) or op-amp feedback networks. |
| Enable Thresholds | VH = 2.4 V min, VL = 0.4 V max - compatible with standard CMOS/TTL logic without level-shifting. |
| Output Noise | 36 µVPP (10 Hz–10 kHz) - meets SNR requirements for 16-bit ADCs (e.g., ADS1256) without additional filtering. |
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 | Internally connected; must remain unconnected externally to prevent noise injection or instability. |
| 2 - GND | Ground reference | Primary return path for load current and supply current; requires low-impedance PCB connection. |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for turn-on; pulling to GND disables output and reduces IQ to <2 µA. |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; minimum headroom to VOUT is 120 mV at 1 mA load. |
| 5 - VOUT | Regulated reference output | Delivers stable 5.0 V ±0.5% with ±5 mA drive; requires 0.022 µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 120 mV typical at 1 mA enables use with single-cell Li-ion (3.0–4.2 V) or dual-cell alkaline supplies. |
| Enable-Controlled Power-Down | Reduces quiescent current to <2 µA - critical for intermittent-sampling systems like wireless sensor nodes. |
| High Output Accuracy | ±0.5% initial tolerance eliminates need for post-assembly trimming in cost-sensitive industrial sensors. |
| Bidirectional Output Drive | ±5 mA capability allows direct interface with ADC reference pins, DAC feedback, or comparator thresholds. |
| Stable with Small Ceramic Capacitors | 0.022 µF minimum COUT simplifies layout and avoids tantalum or electrolytic components in space-constrained designs. |
Applications
| Portable Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and analog front-end gain calibration. Use Value: 50 ppm/°C drift and 36 µVPP noise ensure <0.01% measurement repeatability across 0–50°C ambient range. |
Use Scenario: Wireless environmental sensor node logging temperature/humidity with 12-bit SAR ADC. IC Role / Device Role / Timing Role: Stable reference for ADC and precision LDO feedback in ultra-low-power sleep/wake cycles. Use Value: 160 µA active current and <2 µA shutdown current extend CR2032 battery life to >2 years at 1-sample/minute duty cycle. |
| Industrial Process Monitoring | Precision Regulator Reference |
Use Scenario: 4–20 mA loop-powered transmitter with HART modulation and local display. IC Role / Device Role / Timing Role: Reference for current-loop DAC and sensor excitation circuitry in harsh EMI environments. Use Value: ±5 mA sink/source drives DAC buffer directly; enable pin synchronizes reference activation with HART burst timing. |
Use Scenario: Low-noise 5 V regulator for RF front-end ICs requiring clean supply rails. IC Role / Device Role / Timing Role: Precision reference for adjustable LDO feedback network (e.g., TPS7A47). Use Value: 0.5% initial accuracy and 50 ppm/°C TC minimize output voltage drift across thermal cycling in base station modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3050AIDBVR | 0.2% initial accuracy, 50 ppm/°C TC, 165 µA IQ, same SOT-23-5 package | Higher accuracy grade; tighter initial tolerance improves system calibration margin | Select when ±0.2% absolute reference error is required without post-calibration |
| ADR3450ARJZ-R7 | 0.1% initial accuracy, 10 ppm/°C TC, 120 µA IQ, SOT-23-5, but no enable pin | No power-down function; lower drift enables high-precision metrology-grade designs | Select when ultra-low TC is prioritized over dynamic power control in fixed-supply systems |
Compared with LM4120IM5X-5.0, REF3050AIDBVR offers tighter initial accuracy for calibration-critical systems, while ADR3450ARJZ-R7 delivers superior long-term stability and lower temperature drift - both require layout review due to differing enable functionality and thermal performance.
Availability
LM4120IM5X-5.0 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and industrial process monitoring requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4120IM5X-5.0 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The LM4120 series was designed for micropower, low-dropout voltage reference applications in space-constrained, battery-operated, and industrial systems requiring high accuracy and thermal stability.
FAQ
What is the maximum input voltage for LM4120IM5X-5.0?
The LM4120IM5X-5.0 supports input voltages up to 12 V, as specified in its Absolute Maximum Ratings. Operating above this level risks permanent damage. For reliable long-term operation, TI recommends staying within the Recommended Operating Conditions: VIN ≤ 12 V and VIN ≥ VOUT + dropout (≥5.12 V at 1 mA). The device includes internal protection against reverse current flow between VIN and VOUT.
Does LM4120IM5X-5.0 require an external output capacitor?
Yes, LM4120IM5X-5.0 requires a minimum 0.022 µF ceramic output capacitor for loop stability and transient response. Values up to 1 µF are supported, though capacitors >0.047 µF must be tantalum and require a 50-pF capacitor between VOUT and REF. The REF pin must remain unconnected - adding capacitance there causes instability or output error.
Can LM4120IM5X-5.0 sink current, and how much?
Yes, LM4120IM5X-5.0 can both source and sink up to ±5 mA, confirmed in the Electrical Characteristics table. This bidirectional capability allows it to drive ADC reference inputs, op-amp summing junctions, or comparator hysteresis networks without external buffering - critical for precision sensor signal conditioning where load asymmetry affects offset.
What is the purpose of the REF pin on LM4120IM5X-5.0?
The REF pin on LM4120IM5X-5.0 is an internal reference node that must remain unconnected in all applications. It is highly sensitive to noise and capacitive loading; connecting any external component causes output inaccuracy or oscillation. Layout guidelines explicitly require isolation of this pin from traces, vias, and copper pours to maintain specified accuracy and stability.
Is LM4120IM5X-5.0 suitable for automotive applications?
LM4120IM5X-5.0 is rated for −40°C to 85°C industrial temperature range and is not AEC-Q200 qualified. While it operates within common automotive cabin temperature limits, TI does not specify or guarantee performance for automotive under-hood or safety-critical systems. For automotive use, consult TI's automotive-grade alternatives such as the REF5050QDBVRQ1.
LM4120IM5X-5.0 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):
- 5V
- 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-5.0 FAQ
1.How can I place an order for LM4120IM5X-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-5.0 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-5.0 reliable?
The price and inventory of LM4120IM5X-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5X-5.0 is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-5.0?
LM4120IM5X-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-5.0 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-5.0?
For technical support, including LM4120IM5X-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-5.0 requirements.
6.How does Aetrix verify that LM4120IM5X-5.0 is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-5.0 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-5.0 meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-5.0?
All LM4120IM5X-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-5.0, 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-5.0 part is unused and in its original packaging.
Return procedure for LM4120IM5X-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5X-5.0 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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