My Inquiry
My Account
Texas Instruments LM4120IM5X-2.5/NOPB
- Part No.:
- LM4120IM5X-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,564
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4120IM5X-2.5/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 2.5 V ±0.5% 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 - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4120IM5X-2.5/NOPB datasheet, LM4120IM5X-2.5/NOPB pinout, LM4120IM5X-2.5/NOPB application, or LM4120IM5X-2.5/NOPB equivalent, key selection criteria include output accuracy under load regulation (0.04%/mA), low-noise performance (46 µVPP, 0.1–10 Hz), thermal hysteresis (0.5 mV/V), and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4120IM5X-2.5/NOPB implements a trimmed bandgap core with internal error amplifier and pass transistor, enabling stable 2.5 V reference output with minimal headroom. Its enable pin controls analog startup via ~6 µA threshold current and requires connection to VIN for normal operation or GND for shutdown.
It supports ceramic output capacitors from 0.022 µF to 0.047 µF for stability, tolerates up to 1 µF tantalum for improved transient response, and exhibits PSRR >60 dB at 1 kHz. The REF pin is unconnected and must be isolated from noise and capacitive loading per layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.5% initial accuracy at 25°C - ensures baseline precision before calibration in ADC/DAC reference chains. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - guarantees ≤125 µV drift over full industrial range, critical for sensor signal conditioning. |
| Dropout Voltage | 120 mV typical at 1 mA - enables operation from 2.7 V supply in single-cell Li-ion systems without headroom penalty. |
| Supply Current | 160 µA typical - extends battery life in always-on monitoring nodes; drops to <2 µA in enable-disabled power-down mode. |
| Load Regulation | 0.04%/mA (1–5 mA) - maintains ≤100 µV output shift across full 5 mA sourcing/sinking range, supporting dynamic load switching. |
| Output Noise | 46 µVPP (0.1–10 Hz) - meets resolution requirements for 16-bit+ data converters without external filtering. |
| Enable Threshold | VL = 0.4 V max, VH = 2.4 V min - compatible with standard CMOS/TTL logic for reliable on/off control in microcontroller interfaces. |
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 |
|---|---|---|
| REF | Reference node | Must remain unconnected; sensitive to noise and capacitive coupling - requires physical isolation and guard ring in PCB layout. |
| GND | Ground reference | Primary return path for output current and supply current; connects to system ground plane with low-inductance trace. |
| Enable | Power control input | Analog input requiring ≥2.4 V for active mode; pulled to GND disables output and reduces supply current to <2 µA. |
| VIN | Input supply | Accepts 2 V to 12 V; includes parasitic diode to VOUT - avoid reverse biasing VOUT above VIN. |
| VOUT | Regulated output | 2.5 V reference source/sink up to ±5 mA; requires 0.022–0.047 µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 120 mV at 1 mA enables use with ultra-low-input supplies like coin cells or post-LDO rails. |
| Enable-controlled power-down | Reduces quiescent current to <2 µA - essential for intermittent-sampling IoT sensors and wake-on-event architectures. |
| Source and sink capability | ±5 mA drive strength eliminates need for external buffer op-amps in DAC reference or precision regulator feedback paths. |
| Stable with small ceramic capacitors | 0.022 µF minimum COUT simplifies layout and avoids polarized tantalum parts in cost-sensitive consumer designs. |
| Industrial temperature range | Specified performance from −40°C to +85°C ensures reliability in automotive cabin modules and factory-floor instrumentation. |
Applications
| Portable Data Loggers | Battery-Powered Medical Sensors |
|---|---|
Use Scenario: Continuous 16-bit ADC sampling in handheld ECG monitors powered by single 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Precision 2.5 V reference for SAR ADC, providing stable scale factor independent of battery voltage decay. Use Value: 50 ppm/°C TC and 46 µVPP noise ensure <0.01% measurement error across operating temperature and battery discharge cycle. | Use Scenario: Wearable pulse oximeter with optical front-end requiring stable bias for photodiode transimpedance amplifiers. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for precision current sources driving LEDs and analog front-end gain stages. Use Value: ±5 mA sourcing capability directly drives LED bias circuits while maintaining 2.5 V accuracy within 0.5% over full load range. |
| Industrial Process Transmitters | Automotive Cabin Control Modules |
Use Scenario: 4–20 mA loop-powered temperature transmitter operating in harsh factory environments. IC Role / Device Role / Timing Role: Reference for DAC generating loop current setpoint; enabled only during active measurement cycles. Use Value: Enable pin allows microcontroller to gate reference power, reducing average current draw below 10 µA in sleep mode. | Use Scenario: HVAC control unit in vehicle cabin with microcontroller-based fan speed and temperature regulation. IC Role / Device Role / Timing Role: Reference for analog-to-digital conversion of thermistor and potentiometer inputs. Use Value: 120 mV dropout permits operation from 3.3 V LDO rail even under cold-crank conditions down to 2.8 V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C25IDBZR | Shunt reference (2.5 V, ±0.5%, 100 ppm/°C); requires external bias resistor; no enable pin; 60 µA typical IQ. | Fixed two-terminal topology limits flexibility in low-voltage or high-side sensing; unsuitable for sinking loads or enable-controlled sequencing. | Select when board space is constrained and supply current budget allows continuous bias; avoid where enable control or bidirectional current is required. |
| MAX6025AEUR+T | Series reference (2.5 V, ±0.2%, 20 ppm/°C); 1.8–5.5 V input; 35 µA IQ; no enable pin; SOT-23-5. | Higher initial accuracy and lower TC but lacks power-down capability; limited to ≤5.5 V input - incompatible with 12 V supply rails. | Prefer for ultra-high-precision applications with tight TC budgets and fixed low-voltage supplies; choose LM4120IM5X-2.5/NOPB when 12 V operation or enable control is mandatory. |
Compared with LM4120IM5X-2.5/NOPB, LM4040C25IDBZR trades enable functionality and bidirectional drive for smaller footprint and lower cost, while MAX6025AEUR+T offers superior TC and accuracy at the expense of input voltage range and power management flexibility.
Availability
LM4120IM5X-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical devices, and industrial process transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4120IM5X-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, embedded processing, and digital signal processing technologies with over 50 years of leadership in precision analog ICs.
The LM4120 series was designed specifically for micropower, low-dropout voltage reference applications in space- and energy-constrained systems - emphasizing accuracy, thermal stability, and flexible power control.
FAQ
What is the maximum input voltage rating for LM4120IM5X-2.5/NOPB?
The absolute maximum input voltage for LM4120IM5X-2.5/NOPB is 14 V. Operation beyond this risks permanent damage. For reliable long-term use, TI specifies recommended input range as 2 V to 12 V - sufficient to cover 3.3 V, 5 V, and 12 V system rails while maintaining 120 mV dropout margin at 1 mA load.
Does LM4120IM5X-2.5/NOPB require an external output capacitor, and if so, what value?
Yes, LM4120IM5X-2.5/NOPB requires a minimum 0.022 µF ceramic output capacitor for stability. TI recommends 0.022 µF to 0.047 µF for optimal phase margin; values up to 1 µF tantalum are allowed for improved transient response but require additional design validation across temperature and load conditions.
Can LM4120IM5X-2.5/NOPB both source and sink current, and how much?
Yes, LM4120IM5X-2.5/NOPB provides bidirectional current capability: it can source up to +5 mA and sink up to –5 mA while maintaining output accuracy within specification. This eliminates external buffers in applications such as precision current sources, active filter references, or DAC output conditioning circuits.
What is the purpose of the REF pin on LM4120IM5X-2.5/NOPB, and how should it be handled?
The REF pin on LM4120IM5X-2.5/NOPB is an internal bandgap node and must remain unconnected in all applications. It is highly sensitive to noise and capacitive loading; TI mandates physical isolation, guard rings, and avoidance of nearby traces or vias to prevent output voltage drift or instability.
How does the enable function behave during power-up and shutdown of LM4120IM5X-2.5/NOPB?
LM4120IM5X-2.5/NOPB enters normal operation when Enable ≥2.4 V (typically tied to VIN); it shuts down when Enable ≤0.4 V (tied to GND), reducing supply current to <2 µA. A minimum slew rate of 0.003 V/µs on the Enable pin prevents output glitches - easily met by standard GPIO drivers.
LM4120IM5X-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:
- ±0.5%
- 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-2.5/NOPB FAQ
1.How can I place an order for LM4120IM5X-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-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 LM4120IM5X-2.5/NOPB reliable?
The price and inventory of LM4120IM5X-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 LM4120IM5X-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-2.5/NOPB?
LM4120IM5X-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-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 LM4120IM5X-2.5/NOPB?
For technical support, including LM4120IM5X-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-2.5/NOPB requirements.
6.How does Aetrix verify that LM4120IM5X-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-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 LM4120IM5X-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-2.5/NOPB?
All LM4120IM5X-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-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 LM4120IM5X-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5X-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5X-2.5/NOPB Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
