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Texas Instruments LM4120AIM5X-2.5/NOPB
- Part No.:
- LM4120AIM5X-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120AIM5X-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,374
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Product details
Overview
LM4120AIM5X-2.5/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 2.5 V ±0.2% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load. It features enable-controlled power-down (ISS < 2 µA), ±5 mA source/sink capability, and operates from 2 V to 12 V input across −40°C to 85°C - used in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4120AIM5X-2.5/NOPB datasheet, LM4120AIM5X-2.5/NOPB pinout, LM4120AIM5X-2.5/NOPB application, or LM4120AIM5X-2.5/NOPB equivalent, key selection criteria include output accuracy stability over temperature, ultra-low quiescent current, dropout performance at light loads, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4120AIM5X-2.5/NOPB implements a trimmed bandgap core with internal feedback and enable-controlled biasing circuitry. Its architecture supports stable operation with 0.022–0.047 µF ceramic output capacitors and tolerates input transients up to 14 V absolute maximum rating.
It operates in two functional modes: normal regulation (EN = VIN) and shutdown (EN = GND), with logic thresholds VH = 2.4 V and VL = 0.4 V. The unconnected REF pin requires strict noise isolation per layout guidelines to maintain specified 46 µVPP (0.1–10 Hz) output noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.2% initial accuracy - ensures ≤6.25 mV absolute error at 25°C for high-resolution ADC/DAC biasing. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - contributes ≤125 ppm (0.0125%) drift over full industrial range. |
| Dropout Voltage | 120 mV typical at 1 mA - enables regulation from 2.62 V input, critical for single-cell Li-ion or coin-cell applications. |
| Supply Current | 160 µA typical - supports >1-year battery life in 10 µA average-load portable systems. |
| Power-Down Current | <2 µA - reduces standby loss by >98% versus active mode, essential for wake-on-event architectures. |
| Output Noise | 46 µVPP (0.1–10 Hz) - meets <50 µVPP requirement for 16-bit+ SAR ADC reference inputs. |
| Load Drive | ±5 mA source/sink - directly drives op-amp inputs, DAC references, or small logic loads without buffering. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant tin-silver (SN) finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Reference node | Must remain unconnected; sensitive to noise and capacitive loading - requires guard ring and no trace routing. |
| GND | Ground reference | Return path for supply and load currents; connects to low-impedance ground plane to minimize PSRR degradation. |
| Enable | Digital control input | Active-high logic input (VH = 2.4 V min); pulling to GND disables output and reduces current to <2 µA. |
| VIN | Input supply | Accepts 2–12 V; includes ESD protection diode to GND - must be bypassed with ≥0.1 µF ceramic capacitor. |
| VOUT | Regulated output | Delivers stable 2.5 V; requires 0.022–0.047 µF ceramic capacitor placed adjacent to pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 120 mV at 1 mA enables operation from near-dead batteries or low-headroom supplies. |
| Enable-controlled shutdown | Reduces supply current to <2 µA - extends battery life in intermittent-sampling systems. |
| High output accuracy | ±0.2% initial tolerance eliminates need for system-level calibration in mid-precision applications. |
| Wide input voltage range | 2 V to 12 V operation supports diverse supply rails including single-cell Li-ion, USB, and industrial 5–12 V buses. |
| Low output noise | 46 µVPP (0.1–10 Hz) ensures minimal quantization error in 16-bit analog signal chains. |
Applications
| Portable Instrumentation | Battery-Powered Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC requiring stable reference under varying battery voltage. IC Role / Device Role / Timing Role: Precision 2.5 V reference for ADC conversion and sensor excitation. Use Value: Maintains ±0.2% accuracy and 50 ppm/°C drift across battery discharge (2.8–4.2 V) and ambient temperature shifts. | Use Scenario: Wireless sensor node logging temperature/humidity every 10 seconds using microcontroller with integrated 12-bit ADC. IC Role / Device Role / Timing Role: Low-quiescent reference enabling ADC operation during brief active periods while minimizing sleep-mode current. Use Value: 160 µA active current + <2 µA shutdown current extends CR2032 battery life beyond 2 years. |
| Industrial Process Monitoring | Medical Vital Sign Sensors |
Use Scenario: Loop-powered 4–20 mA transmitter with HART modulation, operating from 12–24 V supply with internal 3.3 V rail. IC Role / Device Role / Timing Role: Reference for precision DAC generating analog output and for sensor front-end gain calibration. Use Value: 120 mV dropout allows clean 2.5 V generation from 3.3 V LDO output, avoiding additional regulation stage. | Use Scenario: Portable pulse oximeter using photodiode amplifier and ADC to measure SpO₂ and heart rate. IC Role / Device Role / Timing Role: Low-noise reference for transimpedance amplifier bias and ADC reference. Use Value: 46 µVPP (0.1–10 Hz) noise floor prevents degradation of weak optical signal SNR in DC-coupled measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA25+ | 2.5 V ±0.1% initial accuracy, 3 ppm/°C TC, 1.8–5.5 V supply, no enable pin | Lacks shutdown control; superior TC but higher cost and no power-gating capability | Select when ultra-low drift dominates over power management needs |
| ADR3425ARJZ-R7 | 2.5 V ±0.1% accuracy, 10 ppm/°C TC, 3–15 V supply, enable pin, 180 µA IQ | Higher accuracy and lower TC, but 60 µA higher quiescent current and larger SOT-23-6 footprint | Select when long-term stability and tighter TC outweigh board space and current budget constraints |
Compared with MAX6126AASA25+ and ADR3425ARJZ-R7, the LM4120AIM5X-2.5/NOPB offers optimal balance of sub-2 µA shutdown, SOT-23-5 compactness, and 0.2% accuracy - making it preferred for space- and energy-constrained portable designs where moderate TC is acceptable.
Availability
LM4120AIM5X-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and industrial process monitoring requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4120AIM5X-2.5/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, designed specifically for low-power, high-accuracy applications in portable, battery-operated, and space-constrained systems.
FAQ
What is the maximum input voltage rating for LM4120AIM5X-2.5/NOPB?
The absolute maximum input voltage for LM4120AIM5X-2.5/NOPB is 14 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable continuous operation, the recommended input range is 2 V to 12 V, ensuring proper regulation and thermal performance within the −40°C to 85°C ambient temperature range. Exceeding 12 V may compromise long-term reliability even if below 14 V.
Does LM4120AIM5X-2.5/NOPB require an external output capacitor, and what value is recommended?
Yes, LM4120AIM5X-2.5/NOPB requires an external output capacitor for stability and transient response. The datasheet specifies a minimum of 0.022 µF and recommends 0.022–0.047 µF ceramic capacitors with ESR of 0.1–0.5 Ω. Larger values up to 1 µF are permissible with tantalum types, but require additional 50-pF capacitor between VOUT and REF pins. Using no capacitor or incorrect type risks oscillation or degraded load step response in the LM4120AIM5X-2.5/NOPB.
How does the enable pin function on LM4120AIM5X-2.5/NOPB, and what are its voltage thresholds?
The enable pin on LM4120AIM5X-2.5/NOPB controls device startup and shutdown. It is an analog input requiring ~6 µA to activate. Logic high threshold (VH) is 2.4 V minimum; logic low (VL) is 0.4 V maximum. Connecting EN to VIN enables regulation; pulling EN to GND disables output and reduces supply current to <2 µA. Floating the pin is not recommended - it must be actively driven to avoid undefined behavior in the LM4120AIM5X-2.5/NOPB.
What is the output noise specification for LM4120AIM5X-2.5/NOPB, and how is it measured?
LM4120AIM5X-2.5/NOPB delivers 46 µVPP output noise over the 0.1 Hz to 10 Hz bandwidth, calculated from the 36 µVPP (1.8 V version) normalized per volt. This low-frequency noise is critical for high-resolution DC measurements. The 10 Hz to 10 kHz noise is 36 µVPP. These values are measured with VIN = 3.3 V, ILOAD = 0, COUT = 0.01 µF, and TA = 25°C - confirming the LM4120AIM5X-2.5/NOPB suitability for 16-bit+ data converters.
Is LM4120AIM5X-2.5/NOPB compatible with lead-free reflow processes?
Yes, LM4120AIM5X-2.5/NOPB is RoHS-compliant with green (Pb-free) packaging and tin-silver (SN) lead finish. It is rated for MSL Level-1 at 260°C peak reflow temperature, meaning it can withstand standard lead-free soldering profiles without dry-pack requirements or floor-life limitations. The SOT-23-5 (DBV) package is qualified for both wave and reflow assembly, supporting automated manufacturing of the LM4120AIM5X-2.5/NOPB.
LM4120AIM5X-2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.2%
- 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
LM4120AIM5X-2.5/NOPB FAQ
1.How can I place an order for LM4120AIM5X-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120AIM5X-2.5/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 LM4120AIM5X-2.5/NOPB reliable?
The price and inventory of LM4120AIM5X-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120AIM5X-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120AIM5X-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120AIM5X-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120AIM5X-2.5/NOPB?
LM4120AIM5X-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120AIM5X-2.5/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 LM4120AIM5X-2.5/NOPB?
For technical support, including LM4120AIM5X-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120AIM5X-2.5/NOPB requirements.
6.How does Aetrix verify that LM4120AIM5X-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120AIM5X-2.5/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 LM4120AIM5X-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120AIM5X-2.5/NOPB?
All LM4120AIM5X-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120AIM5X-2.5/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 LM4120AIM5X-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4120AIM5X-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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