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Texas Instruments LM4120IM5-5.0/NOPB
- Part No.:
- LM4120IM5-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5-5.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,807
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Product details
Overview
LM4120IM5-5.0/NOPB 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. It features enable control, ±5 mA source/sink capability, and 160 μA typical supply current-designed for high-accuracy analog sensing and portable power management circuits.
For engineers reviewing the LM4120IM5-5.0/NOPB datasheet, LM4120IM5-5.0/NOPB pinout, LM4120IM5-5.0/NOPB application, or LM4120IM5-5.0/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The LM4120IM5-5.0/NOPB implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling stable 5.0 V output across input voltages from 5.12 V (VOUT + 120 mV) to 12 V. Its enable pin controls analog startup/shutdown with logic-level thresholds (VH = 2.4 V, VL = 0.4 V) and <2 μA shutdown current.
It operates over −40°C to +85°C, with guaranteed 50 ppm/°C drift and 0.04%/mA load regulation (1–5 mA), supporting precision ADC biasing, sensor excitation, and closed-loop regulator feedback where low quiescent current and tight voltage tolerance are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±0.5% initial accuracy - ensures reference stability within ±25 mV at 25°C before calibration. |
| Temperature Coefficient | 50 ppm/°C (−40°C to +125°C) - contributes ≤2.5 mV drift over full industrial range. |
| Dropout Voltage | 120 mV typical at 1 mA - allows operation from 5.12 V input, minimizing headroom in battery-powered systems. |
| Supply Current | 160 μA typical - enables >1-year runtime on a 220 mAh coin cell at 1 mA load with duty-cycled enable. |
| Enable Thresholds | VH = 2.4 V, VL = 0.4 V - compatible with standard CMOS/TTL logic without level-shifting. |
| Output Drive | ±5 mA source/sink - supports direct driving of 1 kΩ ADC reference inputs or op-amp bias networks. |
| Power-Down Current | <2 μA - reduces system standby power by >98% versus active mode. |
Pinout & Package
LM4120IM5-5.0/NOPB uses the SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant with Sn (matte tin) lead finish and Level-1 MSL rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Must remain unconnected; sensitive to noise and capacitive loading-requires isolation in PCB layout. |
| 2 - GND | Ground reference | Return path for load current and internal circuitry; must be low-impedance connection to minimize ground bounce. |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for activation; pulled to GND disables output and reduces current to <2 μA. |
| 4 - VIN | Positive supply input | Accepts 5.12 V to 12 V; minimum input defined by dropout-no reverse-blocking diode required. |
| 5 - VOUT | Regulated reference output | Delivers stable 5.0 V ±0.5% with ±5 mA drive; requires 0.022–0.047 µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout | 120 mV at 1 mA enables use with single-cell Li-ion (4.2 V max) or dual-cell alkaline (3 V nominal) supplies. |
| Enable Control | Logic-compatible EN pin reduces supply current to <2 μA-critical for intermittent-sampling data loggers. |
| Micropower Operation | 160 μA typical supply current extends battery life in portable instrumentation and wireless sensors. |
| High Output Accuracy | ±0.5% initial tolerance eliminates need for external trimming in 12-bit ADC reference applications. |
| Industrial Temp Range | Specified from −40°C to +85°C ensures reliability in automotive cabin modules and industrial PLC I/O stages. |
Applications
| Portable Data Acquisition | Precision Sensor Excitation |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter sampling thermocouples and RTDs via 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 5.0 V reference for ADC conversion and excitation current source. Use Value: 50 ppm/°C drift and 0.5% initial accuracy maintain ±0.01% measurement linearity across operating temperature. |
Use Scenario: Bridge-based pressure sensor in medical infusion pump requiring ratiometric output scaling. IC Role / Device Role / Timing Role: Supplies excitation voltage to Wheatstone bridge while feeding same reference to ADC. Use Value: Enables true ratiometric measurement-bridge output and ADC full-scale scale identically with temperature. |
| Low-Power Industrial Controller | Automotive Body Control Module |
|
Use Scenario: Remote I/O node monitoring 4–20 mA loop signals using isolated ADC and microcontroller. IC Role / Device Role / Timing Role: Reference for isolated sigma-delta ADC and bias for analog front-end op-amps. Use Value: 160 μA supply current and enable control allow sleep-mode power reduction below 5 μW per channel. |
Use Scenario: Cabin temperature sensor interface in BCM with wake-on-event functionality. IC Role / Device Role / Timing Role: Supplies reference to local ADC during periodic wake cycles; disabled between readings. Use Value: Sub-2 μA shutdown current meets ISO 16750-2 quiescent current requirements for always-on vehicle networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3050AIDBZR | Fixed 5.0 V, ±0.2% initial accuracy, 50 ppm/°C, 50 μA supply current, no enable pin. | Lacks enable control; lower quiescent current but no power-down capability. | Select when ultra-low supply current dominates over dynamic power management needs. |
| ADR3450ARJZ-R7 | Fixed 5.0 V, ±0.1% initial accuracy, 10 ppm/°C, 120 μA supply current, no enable pin. | Higher accuracy and lower drift, but no enable function and higher cost. | Select when long-term stability and temperature performance outweigh need for shutdown control. |
Compared with LM4120IM5-5.0/NOPB, REF3050AIDBZR offers lower operating current but forfeits enable-based power cycling, while ADR3450ARJZ-R7 delivers superior accuracy and drift at the cost of disable functionality and increased BOM cost-making LM4120IM5-5.0/NOPB optimal for battery-constrained designs requiring programmable reference activation.
Availability
LM4120IM5-5.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and automotive body electronics requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4120IM5-5.0/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 broad industrial portfolio coverage.
The LM4120 series belongs to TI's precision voltage reference product line, engineered for low-power, high-accuracy applications in portable, automotive, and industrial systems where micropower operation and enable-controlled power gating are essential.
FAQ
What is the minimum input voltage required for LM4120IM5-5.0/NOPB to regulate at 5.0 V?
The LM4120IM5-5.0/NOPB requires VIN ≥ VOUT + dropout voltage. With 120 mV typical dropout at 1 mA, the minimum input is 5.12 V under that load. At zero load, dropout drops to 65 mV (typical), allowing regulation down to 5.065 V. Input below VOUT + 120 mV risks loss of regulation and output collapse.
Can LM4120IM5-5.0/NOPB drive a 10 kΩ load directly without external buffering?
Yes. With ±5 mA output capability and 0.04%/mA load regulation (1–5 mA), LM4120IM5-5.0/NOPB maintains 5.0 V within ±0.2 mV across 0–500 μA loads. A 10 kΩ load draws only 500 μA, well within spec-no buffer needed for typical ADC reference or op-amp bias applications.
Is the REF pin on LM4120IM5-5.0/NOPB required to be connected to anything?
No. The REF pin on LM4120IM5-5.0/NOPB must remain unconnected in all configurations. It is an internal bandgap node highly sensitive to noise and capacitive loading; connecting it-even to ground or bypass caps-degrades accuracy and stability. PCB layout must isolate this pin completely.
Does LM4120IM5-5.0/NOPB support operation beyond 85°C ambient temperature?
The LM4120IM5-5.0/NOPB is specified for −40°C to +85°C ambient operation. While junction temperature may reach 125°C under certain conditions, key parameters-including initial accuracy and temperature coefficient-are not guaranteed above 85°C ambient. For extended-range use, contact Texas Instruments for qualified alternatives.
How does the enable pin behave during power-up for LM4120IM5-5.0/NOPB?
The LM4120IM5-5.0/NOPB enable pin requires ≥2.4 V to activate. During power ramp, if EN rises slower than VIN, the device remains off until EN crosses threshold. To ensure reliable startup, tie EN directly to VIN or use a simple RC delay to guarantee EN reaches 2.4 V after VIN stabilizes-avoid floating or high-impedance pull-ups.
LM4120IM5-5.0/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):
- 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
LM4120IM5-5.0/NOPB FAQ
1.How can I place an order for LM4120IM5-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5-5.0/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 LM4120IM5-5.0/NOPB reliable?
The price and inventory of LM4120IM5-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5-5.0/NOPB?
LM4120IM5-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5-5.0/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 LM4120IM5-5.0/NOPB?
For technical support, including LM4120IM5-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5-5.0/NOPB requirements.
6.How does Aetrix verify that LM4120IM5-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5-5.0/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 LM4120IM5-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5-5.0/NOPB?
All LM4120IM5-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5-5.0/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 LM4120IM5-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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