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Texas Instruments LM4125IM5-2.5
- Part No.:
- LM4125IM5-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4125IM5-2.5.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,028
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Product details
Overview
LM4125IM5-2.5 from Texas Instruments is a precision micropower low-dropout voltage reference IC delivering a stable 2.5 V output with ±0.5% 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, draws only 160 µA typical supply current, and supports ±5 mA source/sink capability - ideal for high-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4125IM5-2.5 datasheet, LM4125IM5-2.5 pinout, LM4125IM5-2.5 application, or LM4125IM5-2.5 equivalent, key selection considerations include its SOT-23-5 package footprint, thermal hysteresis (0.5 mV/V), 46 µVPP (10 Hz–10 kHz) output noise, and guaranteed performance across −40°C to +85°C ambient.
Technical Context
The LM4125IM5-2.5 implements a bandgap-based reference core with internal trimming for fixed 2.5 V output, optimized for low quiescent current and minimal line/load regulation drift. Its architecture enables bidirectional current flow (±5 mA), supporting both sourcing and sinking without external components.
It features an enable-compatible input structure (no dedicated EN pin), power-down mode drawing <2 µA, and stability with 0.022 µF–0.1 µF ceramic output capacitors. The device's parasitic input-to-output diode requires VIN ≥ VOUT to avoid unintended conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.5% initial accuracy over temperature - ensures ≤12.5 mV absolute error in 12-bit systems. |
| Temperature Coefficient | 50 ppm/°C (−40°C to +125°C) - contributes ≤125 µV/°C drift, critical for precision sensor front-ends. |
| Dropout Voltage | 120 mV typ @ 1 mA - allows operation from 2.62 V supply, enabling direct use with single Li-ion cells. |
| Supply Current | 160 µA typ - extends battery life in always-on monitoring nodes beyond 10 years on a CR2032. |
| Output Noise | 46 µVPP (10 Hz–10 kHz) - limits quantization uncertainty to <0.03 LSB in 16-bit 2.5 V full-scale ADCs. |
| Load Regulation | 0.04%/mA (1–5 mA) - maintains <200 µV change under dynamic load shifts in active filter bias networks. |
| Line Regulation | 0.008%/V (3.3–6 V) - rejects supply ripple better than 100 dB, reducing need for post-regulation filtering. |
Pinout & Package
SOT-23-5 package (DBV), 1.45 mm max height, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connect (NC) | Unbonded; must be left floating or tied to GND per layout best practice to minimize stress-induced drift. |
| Pin 2 | Ground (GND) | Negative supply return; low-impedance path essential for noise rejection and thermal hysteresis control. |
| Pin 3 | No Connect (NC) | Unbonded; no internal connection - avoid routing signals or copper under this pad. |
| Pin 4 | Input (VIN) | Positive supply input; accepts 2 V to 6 V; includes parasitic diode to VOUT requiring VIN ≥ VOUT. |
| Pin 5 | Output (VOUT) | 2.5 V reference output; capable of sourcing/sinking ±5 mA; requires ≥0.022 µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 160 µA typical supply current enables multi-year battery life in wireless sensor nodes. |
| Low dropout | 120 mV typical dropout at 1 mA allows direct regulation from depleted alkaline or LiFePO₄ cells. |
| Bidirectional output | ±5 mA sink/source capability eliminates need for external op-amp buffers in transimpedance or current-source designs. |
| Thermal hysteresis control | 0.5 mV/V spec ensures <1.25 mV output shift after thermal cycling - critical for calibration-critical test equipment. |
| Stable with small ceramics | Guaranteed stability with 0.022 µF–0.1 µF X7R ceramic capacitors reduces BOM count and board area vs. tantalum alternatives. |
Applications
| Portable Data Loggers | Precision Thermocouple Amplifiers |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature/humidity every 10 seconds for 5+ years. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for 16-bit SAR ADC and low-power MCU analog peripherals. Use Value: 160 µA supply current and 2.62 V minimum operating voltage extend CR123A battery life beyond 60 months. |
Use Scenario: Industrial-grade thermocouple measurement modules requiring <1°C total error over −40°C to +85°C. IC Role / Device Role / Timing Role: Supplies excitation and reference for cold-junction compensation circuitry and PGA gain-setting resistors. Use Value: 50 ppm/°C tempco and 0.5% initial accuracy limit reference-induced error to <0.8°C across full industrial range. |
| Medical ECG Front-Ends | Automotive Battery Management ICs |
Use Scenario: Portable ECG devices digitizing microvolt-level biopotentials with >100 dB SNR requirement. IC Role / Device Role / Timing Role: Low-noise 2.5 V reference for 24-bit delta-sigma ADC and programmable gain amplifier stages. Use Value: 46 µVPP (10 Hz–10 kHz) output noise contributes <0.3 LSB noise floor in 2.5 V full-scale 24-bit conversion. |
Use Scenario: Automotive BMS units measuring cell voltages with ±1 mV accuracy across 125°C junction temperature range. IC Role / Device Role / Timing Role: High-stability reference for precision voltage dividers feeding isolated sigma-delta modulators. Use Value: Guaranteed 50 ppm/°C tempco and −40°C to +125°C junction rating ensure accuracy compliance under hood conditions. |
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 | 0.2% initial accuracy, 50 ppm/°C, 165 µA supply current, same SOT-23-5 package. | Higher accuracy grade; tighter initial tolerance improves calibration yield in metrology tools. | Select REF3025AIDBZR when ±0.2% initial error is required and cost premium is acceptable. |
| ADR3425ARJZ-R7 | 0.1% initial accuracy, 30 ppm/°C, 120 µA supply current, same 5-pin SOT-23 footprint. | Lower tempco and supply current; superior long-term stability (50 ppm/1000 hrs vs. 100 ppm). | Choose ADR3425ARJZ-R7 for ultra-stable applications like portable calibrators where drift budget is constrained. |
Compared with LM4125IM5-2.5, REF3025AIDBZR offers tighter initial accuracy but identical tempco and power consumption, while ADR3425ARJZ-R7 delivers lower drift and current at higher cost - making LM4125IM5-2.5 optimal for cost-sensitive industrial sensors needing robust −40°C to +85°C performance.
Availability
LM4125IM5-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and industrial process control systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4125IM5-2.5 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 leadership in precision analog ICs.
The LM4125 series was designed specifically for micropower, low-dropout voltage reference applications in space-constrained, battery-operated systems demanding high accuracy and thermal stability.
FAQ
What is the maximum input voltage for LM4125IM5-2.5?
The LM4125IM5-2.5 supports a maximum input voltage of 8 V under absolute maximum ratings, but its specified operating range is 2 V to 6 V. Exceeding 6 V may cause excessive power dissipation or reliability degradation. For continuous operation, keep VIN ≤ 6 V; the device's internal parasitic diode conducts if VOUT exceeds VIN, so maintain VIN ≥ VOUT during all operating conditions.
Does LM4125IM5-2.5 have a dedicated enable pin?
No, the LM4125IM5-2.5 does not include a dedicated enable (EN) pin. Power-down functionality is achieved by reducing input voltage below 2 V, which lowers supply current to <2 µA. Pin 1 and Pin 3 are unconnected (NC); they must remain floating or grounded per TI layout guidelines to minimize mechanical stress effects on output voltage.
What output capacitor value is required for LM4125IM5-2.5 stability?
The LM4125IM5-2.5 requires a minimum 0.022 µF ceramic capacitor (X7R or C0G) between VOUT and GND for guaranteed stability. Capacitance can be increased up to 0.1 µF using ceramic types; values above 0.047 µF require tantalum construction with an additional 50 pF capacitor from VOUT to the reference node. Larger capacitors improve transient response but necessitate full thermal and load testing.
Is LM4125IM5-2.5 suitable for automotive under-hood applications?
The LM4125IM5-2.5 is rated for −40°C to +85°C ambient operation, meeting standard automotive cabin requirements but not under-hood (125°C). While its junction temperature range extends to +125°C, TI specifies full parametric guarantees only to +85°C ambient. For under-hood use, consider the LM4125AIM5-2.5/NOPB variant, qualified to −40°C to +125°C ambient with identical electrical specs.
How does load regulation affect LM4125IM5-2.5 in sourcing vs. sinking configurations?
LM4125IM5-2.5 exhibits symmetric load regulation: 0.04%/mA for 1–5 mA sourcing and −1 to 0 mA sinking, contributing ≤200 µV error across its full ±5 mA range. This symmetry simplifies design in bidirectional circuits like precision current sources or active filters where the reference must drive both positive and negative signal paths without recalibration.
LM4125IM5-2.5 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:
- ±0.5%
- 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
LM4125IM5-2.5 FAQ
1.How can I place an order for LM4125IM5-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4125IM5-2.5 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 LM4125IM5-2.5 reliable?
The price and inventory of LM4125IM5-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4125IM5-2.5 is usually 5 days.
3.What payment methods are accepted for LM4125IM5-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4125IM5-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4125IM5-2.5?
LM4125IM5-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4125IM5-2.5 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 LM4125IM5-2.5?
For technical support, including LM4125IM5-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4125IM5-2.5 requirements.
6.How does Aetrix verify that LM4125IM5-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4125IM5-2.5 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 LM4125IM5-2.5 meets industry standards.
7.What is the process for return or replacement of LM4125IM5-2.5?
All LM4125IM5-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4125IM5-2.5, 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 LM4125IM5-2.5 part is unused and in its original packaging.
Return procedure for LM4125IM5-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4125IM5-2.5 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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