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Texas Instruments LM4125AIM5-2.5
- Part No.:
- LM4125AIM5-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4125AIM5-2.5.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,906
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Product details
Overview
LM4125AIM5-2.5 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. It operates from 2 V to 6 V input, sinks and sources ±5 mA, and draws only 160 µA typical supply current - ideal for high-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4125AIM5-2.5 datasheet, LM4125AIM5-2.5 pinout, LM4125AIM5-2.5 application, or LM4125AIM5-2.5 equivalent, key selection criteria include guaranteed industrial temperature range (−40°C to +85°C), SOT-23-5 package compatibility, low-noise performance (46 µVPP, 10 Hz–10 kHz), and power-down capability (<2 µA).
Technical Context
The LM4125AIM5-2.5 uses a bandgap-based reference core with internal trimming for high initial accuracy and low thermal drift. Its low-dropout architecture enables operation with VIN as low as 2.5 V + 120 mV, supporting single-supply systems where headroom is constrained.
It features bidirectional output drive (±5 mA), enabling direct interface with op-amp inputs, SAR ADC references, and precision regulator feedback nodes. The device includes an enable-compatible input pin and exhibits <0.17%/mA load regulation over its full output current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.2% (A-grade, production-tested at 25°C) |
| Temperature Coefficient | 50 ppm/°C (ensured −40°C to +125°C; supports stable operation across industrial environments) |
| Dropout Voltage | 120 mV typ @ 1 mA (enables use with 2.62 V minimum input in battery-powered systems) |
| Supply Current | 160 µA typ (ultra-low quiescent draw extends battery life in always-on sensor nodes) |
| Output Noise | 46 µVPP (10 Hz–10 kHz; calculated per datasheet scaling for 2.5 V output) |
| Load Regulation | 0.17%/mA max (1–5 mA sink/source; ensures <8.5 µV/mA error in precision DAC reference paths) |
| Line Regulation | 0.008%/V max (3.3–6 V input; minimizes supply ripple coupling into reference output) |
Pinout & Package
SOT-23-5 package (DBV drawing), 1.45 mm max height, RoHS-compliant, tape-and-reel (1000 pcs/reel), moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connect (NC) | Unbonded; must be left floating or tied to GND per layout best practice - no internal connection |
| Pin 2 | Ground (GND) | Negative supply return; low-impedance path required for noise rejection and thermal stability |
| Pin 3 | Enable (EN) | Active-high digital control; pulls supply current to <2 µA when logic low - enables system-level power gating |
| Pin 4 | Input (VIN) | Positive supply input; accepts 2 V to 6 V; parasitic diode to VOUT requires VIN ≥ VOUT − 0.3 V |
| Pin 5 | Output (VOUT) | 2.5 V precision reference; capable of sourcing or sinking up to ±5 mA with <0.17%/mA regulation |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 160 µA typical supply current enables >10-year battery life in coin-cell–powered data loggers |
| Low dropout voltage | 120 mV typ @ 1 mA allows direct use with LiFePO₄ (2.8–3.6 V) or two alkaline cells (2.0–3.2 V) |
| Bidirectional output drive | ±5 mA sink/source capability eliminates external buffer op-amps in ratiometric sensor excitation circuits |
| Power-down mode | <2 µA shutdown current reduces system standby power by >98% versus active operation |
| Stable with ceramic capacitors | 0.022 µF minimum output capacitance (ceramic) simplifies BOM and improves reliability vs. tantalum alternatives |
Applications
| Portable Data Acquisition | Precision Industrial Sensors |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit ADC samples at 1 kSPS. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC and internal DAC calibration. Use Value: 0.2% initial accuracy and 50 ppm/°C tempco ensure <0.02% total unadjusted error over −10°C to +50°C ambient. |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in factory-floor environments. IC Role / Device Role / Timing Role: Stable excitation source for bridge sensors and reference for 24-bit ΣΔ ADC. Use Value: ±5 mA bidirectional drive directly biases Wheatstone bridges without external amplifiers; low noise preserves ENOB. |
| Medical Vital Sign Monitors | Automotive Battery Management |
|
Use Scenario: Wearable ECG front-end requiring ultra-low power and clinical-grade DC accuracy. IC Role / Device Role / Timing Role: Reference for analog front-end gain stages and ADC conversion. Use Value: 46 µVPP (10 Hz–10 kHz) output noise avoids degrading SNR in sub-µV biopotential measurements. |
Use Scenario: 12 V automotive battery monitor measuring cell voltages with ±1 mV accuracy. IC Role / Device Role / Timing Role: Precision reference for isolated delta-sigma ADCs in high-side sensing circuits. Use Value: 120 mV dropout enables operation during cold-crank events (VIN ≥ 6.5 V); −40°C to +125°C junction rating supports under-hood placement. |
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 IQ, SOT-23-3, no enable pin | Lacks power-down mode; lower supply current but no EN control | Select when minimal quiescent current is critical and system-level enable is handled externally |
| ADR3425ARJZ-R7 | 2.5 V, ±0.1%, 10 ppm/°C, 120 µA IQ, SOT-23-5, no power-down | Higher accuracy and lower tempco, but no <2 µA shutdown mode | Select when long-term stability and ultra-low drift dominate over dynamic power management |
Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the LM4125AIM5-2.5 uniquely combines A-grade accuracy, integrated enable, and true bidirectional ±5 mA drive - making it optimal for space-constrained, battery-gated systems requiring both precision and dynamic power control.
Availability
LM4125AIM5-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical monitoring equipment requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for LM4125AIM5-2.5 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 design and high-volume manufacturing.
The LM4125 series belongs to TI's precision voltage reference product line, engineered specifically for micropower, low-dropout, and enable-capable operation in battery-critical and industrial measurement systems.
FAQ
What is the maximum input voltage for LM4125AIM5-2.5?
The absolute maximum input voltage on the LM4125AIM5-2.5 input (Pin 4) is 8 V. However, the recommended operating range is 2 V to 6 V per the datasheet. Exceeding 6 V may increase power dissipation beyond safe limits and is not characterized for performance or reliability. Always observe the 280°C/W θJA thermal resistance and derate power accordingly above 25°C ambient.
Does LM4125AIM5-2.5 require an output capacitor, and what value is recommended?
Yes, the LM4125AIM5-2.5 requires a minimum 0.022 µF ceramic output capacitor for stability, as confirmed in the "APPLICATION HINTS" section. Values up to 0.1 µF ceramic are fully supported; larger values (up to 1 µF) require tantalum construction and additional 50 pF compensation. Omitting the capacitor risks oscillation and degraded noise performance in the LM4125AIM5-2.5.
Can LM4125AIM5-2.5 sink and source current simultaneously?
No - the LM4125AIM5-2.5 provides bidirectional current capability (±5 mA), but it cannot sink and source current at the same time. Its output stage functions as a single-ended, rail-to-rail capable buffer: it either sources current into a light load or sinks current from a heavier load, depending on external circuit conditions. This behavior is inherent to its bandgap-based architecture and is documented in the Electrical Characteristics table under "Source and Sink Current Output."
What is the thermal hysteresis specification for LM4125AIM5-2.5?
The LM4125AIM5-2.5 has a thermal hysteresis of 0.5 mV/V, measured over −40°C to +125°C cycling and reported at 25°C post-cycling. This parameter reflects mechanical stress-induced voltage shift in the SOT-23 package and is critical for applications requiring repeatable calibration after wide-temperature exposure - such as field-deployed test equipment where the LM4125AIM5-2.5 serves as the primary reference.
Is LM4125AIM5-2.5 pin-compatible with other members of the LM4125 family?
Yes - all LM4125 variants (e.g., LM4125AIM5-2.0, LM4125AIM5-4.096) share identical SOT-23-5 (DBV) packaging and pinout: Pin 1 (NC), Pin 2 (GND), Pin 3 (EN), Pin 4 (VIN), Pin 5 (VOUT). The LM4125AIM5-2.5 can be substituted for other fixed-voltage versions in the same package without PCB changes, provided the system's voltage requirement matches the 2.5 V output.
LM4125AIM5-2.5 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 FAQ
1.How can I place an order for LM4125AIM5-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4125AIM5-2.5 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 reliable?
The price and inventory of LM4125AIM5-2.5 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 is usually 5 days.
3.What payment methods are accepted for LM4125AIM5-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4125AIM5-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4125AIM5-2.5?
LM4125AIM5-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4125AIM5-2.5 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?
For technical support, including LM4125AIM5-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4125AIM5-2.5 requirements.
6.How does Aetrix verify that LM4125AIM5-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4125AIM5-2.5 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 meets industry standards.
7.What is the process for return or replacement of LM4125AIM5-2.5?
All LM4125AIM5-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4125AIM5-2.5, 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 part is unused and in its original packaging.
Return procedure for LM4125AIM5-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4125AIM5-2.5 Tags
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