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Texas Instruments LM4125AIM5-2.5/NOPB
- Part No.:
- LM4125AIM5-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4125AIM5-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,178
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Product details
Overview
LM4125AIM5-2.5/NOPB from Texas Instruments is a precision micropower low-dropout voltage reference IC delivering a stable 2.5 V output with ±0.2% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load-designed for high-accuracy analog signal chains in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4125AIM5-2.5/NOPB datasheet, LM4125AIM5-2.5/NOPB pinout, LM4125AIM5-2.5/NOPB application, or LM4125AIM5-2.5/NOPB equivalent, key selection criteria include guaranteed industrial temperature range (−40°C to +85°C), ±5 mA source/sink capability, 160 µA typical supply current, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4125AIM5-2.5/NOPB uses a bandgap-based architecture with internal trimming to achieve 0.2% initial output voltage accuracy and 50 ppm/°C tempco over −40°C to +125°C. Its low 120 mV dropout enables operation with input voltages as low as 2.62 V while maintaining regulation at 2.5 V output.
It supports bidirectional load current (±5 mA), features power-down mode drawing <2 µA, and delivers ultra-low 10 Hz–10 kHz output noise of 46 µVPP (calculated per datasheet scaling). The device is stable with 0.022 µF–0.1 µF ceramic output capacitors and includes built-in ESD protection (2 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.2% initial accuracy - ensures minimal calibration burden in 12-bit+ ADC/DAC references. |
| Temperature Coefficient | 50 ppm/°C (−40°C to +125°C) - maintains ≤125 µV drift over full industrial range, critical for precision sensor front-ends. |
| Dropout Voltage | 120 mV typ @ 1 mA - allows operation from single-cell Li-ion (3.0 V min) or 3.3 V rails with margin. |
| Supply Current | 160 µA typ - extends battery life in always-on monitoring nodes; drops to <2 µA in power-down mode. |
| Load Drive | ±5 mA source/sink - directly drives ADC reference inputs, op-amp bias networks, or small DAC loads without buffering. |
| Output Noise | 46 µVPP (10 Hz–10 kHz) - calculated per datasheet scaling (36 µVPP/1.8 V × 2.5 V), suitable for 16-bit SAR ADCs. |
| Line Regulation | 0.008 %/V (3.3 V–6 V) - limits output shift to <200 µV across input rail variation, easing LDO selection upstream. |
Pinout & Package
SOT-23-5 package (DBV), 2.9 mm × 1.6 mm footprint, 1.45 mm max height, RoHS-compliant, tape-and-reel (1000 pcs/reel), moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded pin; must be left floating-no internal connection or function. |
| 2 (GND) | Ground | Reference return path; requires low-impedance connection to system ground plane to minimize noise coupling. |
| 3 (EN) | Enable | Active-high digital control: drives output to regulation when high; reduces quiescent current to <2 µA when low. |
| 4 (IN) | Input Supply | Positive supply input (2 V–6 V); contains parasitic diode to OUT-must not allow OUT > IN. |
| 5 (OUT) | Reference Output | Stable 2.5 V output; capable of sourcing or sinking up to ±5 mA; requires ≥0.022 µF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 160 µA typical supply current enables multi-year battery life in wireless sensor nodes and portable meters. |
| Low Dropout Architecture | 120 mV dropout at 1 mA allows direct regulation from 2.62 V minimum input-ideal for single-cell energy harvesting systems. |
| Bidirectional Load Capability | ±5 mA output drive eliminates need for external buffers when interfacing with ADC reference pins or op-amp feedback networks. |
| Power-Down Control | EN pin reduces current to <2 µA, enabling duty-cycled operation in low-duty-cycle data loggers without external switches. |
| Stability with Small Ceramic Caps | Guaranteed stability with 0.022 µF–0.1 µF X7R ceramic output capacitors-reduces BOM count and board area vs. tantalum alternatives. |
Applications
| Portable Data Loggers | Precision Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node acquiring temperature, humidity, and pressure with 16-bit ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC and analog front-end op-amps. Use Value: 0.2% initial accuracy and 50 ppm/°C tempco ensure <0.01% total error contribution over −25°C to +70°C operating range. |
Use Scenario: Industrial pressure transmitter with 4–20 mA loop powered by 24 V supply and local 3.3 V rail. IC Role / Device Role / Timing Role: Stable 2.5 V reference for bridge amplifier gain-setting and ADC conversion. Use Value: ±5 mA sink/source capability directly biases Wheatstone bridge and drives ratiometric ADC reference without added components. |
| Handheld Test Equipment | Medical Vital Sign Monitors |
|
Use Scenario: Portable multimeter with autoranging, true RMS measurement, and LCD display. IC Role / Device Role / Timing Role: Reference for dual-slope integrator and internal calibration DACs. Use Value: 46 µVPP (10 Hz–10 kHz) noise floor supports 5½-digit resolution without external filtering. |
Use Scenario: Wearable ECG monitor requiring low-power, high-accuracy analog front-end for sub-mV signal amplification. IC Role / Device Role / Timing Role: Precision reference for instrumentation amplifier and 12-bit successive-approximation ADC. Use Value: 160 µA supply current and EN-controlled power-down extend single-charge battery life beyond 72 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2%, 50 ppm/°C, 50 µA supply current, SOT-23-3 - no enable pin, lower quiescent current, but no sink capability. | Lacks bidirectional drive and EN control; suited for ultra-low-power static references where load is purely capacitive or high-Z. | Select REF3025AIDBZR only if sink current and active power-down are unnecessary and supply current <100 µA is mandatory. |
| ADR3425ARJZ-R7 | 2.5 V, ±0.1%, 10 ppm/°C, 120 µA supply current, SOT-23-5 - tighter accuracy/tempco, but no power-down mode and limited to 10 mA sink. | Higher precision and lower drift, but lacks EN pin and draws more current in active state than LM4125AIM5-2.5/NOPB. | Choose ADR3425ARJZ-R7 when long-term stability and ultra-low tempco outweigh power-down flexibility and micropower needs. |
Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the LM4125AIM5-2.5/NOPB uniquely combines 0.2% accuracy, ±5 mA bidirectional drive, EN-controlled power-down (<2 µA), and 160 µA active supply current in a standard SOT-23-5-making it optimal for dynamically powered, mixed-signal portable systems.
Availability
LM4125AIM5-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and precision sensor interface applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for LM4125AIM5-2.5/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision analog IC design and manufacturing.
The LM4125 series belongs to TI's precision voltage reference product line, engineered specifically for low-power, high-accuracy applications demanding tight initial tolerance, low tempco, and robust performance across industrial temperature ranges.
FAQ
What is the maximum input voltage rating for LM4125AIM5-2.5/NOPB?
The absolute maximum input voltage on the IN pin of LM4125AIM5-2.5/NOPB is 8 V. Operating above this risks permanent damage. The recommended operating range is 2 V to 6 V, ensuring proper regulation and low dropout behavior. Exceeding 6 V may increase power dissipation beyond safe limits, especially at elevated ambient temperatures.
Does LM4125AIM5-2.5/NOPB support sinking current, and how much?
Yes, LM4125AIM5-2.5/NOPB supports sinking up to −5 mA, confirmed in the Electrical Characteristics table under "Source and Sink Current Output: ±5 mA". This bidirectional capability allows it to actively pull down the reference node-critical for driving ADC reference inputs with dynamic loading or biasing op-amp feedback networks that require current sink paths.
What output capacitor value is required for stable operation of LM4125AIM5-2.5/NOPB?
A minimum 0.022 µF ceramic capacitor is required between OUT and GND for stable operation of LM4125AIM5-2.5/NOPB. The datasheet specifies stability with 0.022 µF to 0.1 µF X7R ceramics; values above 0.047 µF require tantalum construction and additional 50 pF compensation. Using less than 0.022 µF risks oscillation or degraded transient response.
Is LM4125AIM5-2.5/NOPB rated for extended temperature operation beyond +85°C?
LM4125AIM5-2.5/NOPB is specified for operation from −40°C to +85°C (industrial range). While certain parameters-including temperature coefficient-are ensured from −40°C to +125°C, full electrical specifications over the extended range require consultation with Texas Instruments. The device marking and packaging (MSL Level-1, −40°C to +125°C storage) support mounting in higher ambient environments, but guaranteed performance remains within the industrial grade.
How does the EN pin function on LM4125AIM5-2.5/NOPB, and what happens when it is pulled low?
The EN pin on LM4125AIM5-2.5/NOPB is an active-high enable input. When pulled low (≤0.8 V), the device enters power-down mode, reducing supply current to less than 2 µA while disabling the output. The output becomes high-impedance and unregulated. Pulling EN high (≥2.0 V) restores full operation with 160 µA typical supply current and regulated 2.5 V output.
LM4125AIM5-2.5/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:
- 3.3V ~ 8V
- Current - Supply:
- 290µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4125AIM5-2.5/NOPB FAQ
1.How can I place an order for LM4125AIM5-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4125AIM5-2.5/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 LM4125AIM5-2.5/NOPB reliable?
The price and inventory of LM4125AIM5-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4125AIM5-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4125AIM5-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4125AIM5-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4125AIM5-2.5/NOPB?
LM4125AIM5-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4125AIM5-2.5/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 LM4125AIM5-2.5/NOPB?
For technical support, including LM4125AIM5-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4125AIM5-2.5/NOPB requirements.
6.How does Aetrix verify that LM4125AIM5-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4125AIM5-2.5/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 LM4125AIM5-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4125AIM5-2.5/NOPB?
All LM4125AIM5-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4125AIM5-2.5/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 LM4125AIM5-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4125AIM5-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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