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Texas Instruments LM4120IM5X-4.1/NOPB
- Part No.:
- LM4120IM5X-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,048
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Product details
Overview
LM4120IM5X-4.1/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 4.096 V output with ±0.5% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load - used in portable instrumentation, battery-powered data acquisition, and precision regulators where stable, low-power reference voltage is critical.
For engineers reviewing the LM4120IM5X-4.1/NOPB datasheet, LM4120IM5X-4.1/NOPB pinout, LM4120IM5X-4.1/NOPB application, or LM4120IM5X-4.1/NOPB equivalent, key selection criteria include guaranteed industrial temperature range (−40°C to +85°C), enable-controlled power-down (<2 µA), ±5 mA source/sink capability, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4120IM5X-4.1/NOPB implements a bandgap-based reference core with integrated enable control and low-quiescent-current biasing. Its architecture supports operation from 2 V to 12 V input while maintaining output regulation across −40°C to +85°C ambient.
It features a dedicated enable pin requiring ~6 µA turn-on current and logic-level thresholds (VH = 2.4 V, VL = 0.4 V), plus a floating REF pin that must remain unconnected to avoid noise sensitivity and capacitive loading errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.5% (initial accuracy at 25°C; A-grade variant offers ±0.2%) |
| Temperature Coefficient | 50 ppm/°C (ensured over −40°C to +125°C; critical for stability in varying thermal environments) |
| Dropout Voltage | 120 mV typical at 1 mA load (enables operation with VIN as low as VOUT + 0.12 V) |
| Supply Current | 160 µA typical (supports multi-year battery life in always-on sensor nodes) |
| Power-Down Current | <2 µA when ENABLE = GND (reduces system standby power by >98% vs active mode) |
| Output Drive | ±5 mA source/sink (sufficient to drive ADC references, op-amp bias networks, or small DACs directly) |
| Line Regulation | 0.008%/V (minimizes output drift during battery discharge or supply ripple) |
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 - isolation on PCB prevents output error |
| 2 - GND | Ground reference | Return path for supply, load, and enable currents; low-impedance connection essential for accuracy |
| 3 - ENABLE | Digital control input | Active-high logic input; pull to VIN for normal operation, GND for shutdown; 6 µA typical turn-on current |
| 4 - VIN | Positive supply input | Accepts 2 V to 12 V; dropout behavior defined relative to VOUT; bypass capacitor recommended |
| 5 - VOUT | Stable reference output | 4.096 V regulated output; capable of sourcing/sinking ±5 mA; requires 0.022–1 µF output capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled power-down | Reduces supply current to <2 µA - enables ultra-low-power sleep modes in portable systems |
| Low dropout voltage | 120 mV typical at 1 mA - allows operation from partially discharged batteries (e.g., single Li-ion down to 4.2 V) |
| High output accuracy | ±0.5% initial tolerance - eliminates need for post-manufacturing trimming in cost-sensitive applications |
| Wide input voltage range | 2 V to 12 V - compatible with diverse supply rails including 3.3 V, 5 V, and unregulated battery inputs |
| Industrial temperature range | −40°C to +85°C operation - qualified for use in automotive cabin electronics and industrial field instruments |
Applications
| Portable Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC requiring stable reference under varying battery voltage. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion, directly setting full-scale input range. Use Value: 4.096 V output matches common 16-bit ADC LSB scaling (e.g., 4.096 V / 65536 = 62.5 µV), minimizing digital gain error. |
Use Scenario: Wireless sensor node logging temperature and humidity with intermittent transmission. IC Role / Device Role / Timing Role: Reference for analog front-end signal conditioning and ADC, enabled only during sampling. Use Value: Enable pin allows synchronous power gating - cuts reference current to <2 µA between samples, extending battery life by >10×. |
| Precision Regulators | Medical Vital Sign Monitors |
Use Scenario: Low-noise LDO feedback reference in a 3.3 V medical power rail. IC Role / Device Role / Timing Role: Precision setpoint generator for error amplifier in adjustable LDO topology. Use Value: 50 ppm/°C tempco ensures <±1.7 mV drift over −40°C to +85°C - maintains regulator accuracy without calibration. |
Use Scenario: ECG front-end with 24-bit delta-sigma ADC requiring sub-µV noise floor. IC Role / Device Role / Timing Role: Low-noise reference (36 µVPP, 10 Hz–10 kHz) for ADC and analog filter biasing. Use Value: Output noise specification directly limits achievable ENOB - 36 µVPP supports ≥19-bit effective resolution at 1 kSPS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C41IDBZR | Shunt reference; requires external bias resistor; 0.5% accuracy; 100 ppm/°C tempco; no enable pin | Higher quiescent current (60 µA min); unsuitable for low-dropout or enable-controlled systems | Select when board space allows shunt topology and enable functionality is unnecessary |
| REF3041AIDBZR | Series reference; 0.2% accuracy; 50 ppm/°C; 160 µA supply current; no enable pin; 4.096 V output | Lacks power-down mode - draws full current continuously; same SOT-23-5 footprint | Choose when highest initial accuracy is required and system-level power gating is handled externally |
Compared with LM4120IM5X-4.1/NOPB, LM4040C41IDBZR demands higher minimum cathode current and lacks enable control, while REF3041AIDBZR improves accuracy but forfeits power-down capability - making LM4120IM5X-4.1/NOPB optimal for battery-critical, intermittently active systems.
Availability
LM4120IM5X-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and precision regulators requiring stable component supply with long-term manufacturability and RoHS compliance.
Supply support for LM4120IM5X-4.1/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 was designed for low-power, high-accuracy voltage referencing in space- and energy-constrained applications - targeting portable test equipment, medical sensors, and industrial IoT endpoints.
FAQ
What is the output voltage tolerance of LM4120IM5X-4.1/NOPB over temperature?
The LM4120IM5X-4.1/NOPB has an initial accuracy of ±0.5% at 25°C and a temperature coefficient of 50 ppm/°C, ensuring total output variation remains within ±0.75% over the full industrial range (−40°C to +85°C), as confirmed in Section 6.5 of the SNVS049F datasheet. This performance is guaranteed without external trimming.
Does LM4120IM5X-4.1/NOPB require an external output capacitor, and what value is recommended?
Yes, LM4120IM5X-4.1/NOPB requires a minimum 0.022 µF ceramic output capacitor for loop stability, with optimal range 0.022 µF to 0.047 µF. Larger values up to 1 µF are permitted using tantalum capacitors, but require a 50-pF capacitor between VOUT and REF pins - per Section 8.1 of the LM4120 datasheet.
How does the ENABLE pin function on LM4120IM5X-4.1/NOPB?
The ENABLE pin on LM4120IM5X-4.1/NOPB is an analog input requiring ~6 µA to activate; it must be pulled to VIN for normal operation and to GND for shutdown. Logic thresholds are VH = 2.4 V (min) and VL = 0.4 V (max). Floating the pin is not allowed - Section 7.3.1 and Table 1 confirm this behavior.
Can LM4120IM5X-4.1/NOPB operate with an input voltage below 4.096 V?
Yes - LM4120IM5X-4.1/NOPB supports input voltages as low as 2 V and operates with dropout as low as 120 mV at 1 mA, meaning it functions with VIN ≥ 4.216 V under typical load. At zero load, dropout drops to 65 mV, enabling operation down to VIN = 4.161 V - verified in Electrical Characteristics Table 6.5.
Is the REF pin on LM4120IM5X-4.1/NOPB connected internally, and how should it be handled?
No - the REF pin on LM4120IM5X-4.1/NOPB is an internal bandgap node and must remain unconnected in all applications. It is highly sensitive to noise and capacitive loading; PCB layout must isolate it from traces, vias, and copper pours - explicitly stated in Section 7.3.2 and Pin Functions table.
LM4120IM5X-4.1/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):
- 4.096V
- 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-4.1/NOPB FAQ
1.How can I place an order for LM4120IM5X-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-4.1/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 LM4120IM5X-4.1/NOPB reliable?
The price and inventory of LM4120IM5X-4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5X-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-4.1/NOPB?
LM4120IM5X-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-4.1/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 LM4120IM5X-4.1/NOPB?
For technical support, including LM4120IM5X-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-4.1/NOPB requirements.
6.How does Aetrix verify that LM4120IM5X-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-4.1/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 LM4120IM5X-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-4.1/NOPB?
All LM4120IM5X-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-4.1/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 LM4120IM5X-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5X-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5X-4.1/NOPB Tags
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