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Texas Instruments LM4120IM5X-2.5
- Part No.:
- LM4120IM5X-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-2.5.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
LM4120IM5X-2.5 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 - designed for battery-powered instrumentation, portable medical devices, and industrial data acquisition systems requiring stable low-power biasing.
For engineers reviewing the LM4120IM5X-2.5 datasheet, LM4120IM5X-2.5 pinout, LM4120IM5X-2.5 application, or LM4120IM5X-2.5 equivalent, key selection criteria include enable-controlled power-down (≤2 µA), ±5 mA source/sink capability, SOT-23-5 package compatibility, and guaranteed performance across −40°C to +85°C.
Technical Context
The LM4120IM5X-2.5 implements a bandgap-based reference core with integrated enable control and low-impedance output buffer. Its architecture supports operation from VIN = 2 V to 12 V while maintaining regulation down to 120 mV headroom at 1 mA - enabling use in ultra-low-voltage systems where input supply margin is constrained.
It features an analog enable input with defined logic thresholds (VH = 2.4 V, VL = 0.4 V), 6 µA typical enable current, and <0.003 V/µs minimum slew rate to prevent output glitches. The REF pin is internally connected and must remain unconnected externally to avoid noise coupling or capacitive loading effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.5% initial accuracy at 25°C - ensures baseline precision without calibration in mid-tier instrumentation. |
| Temperature Coefficient | 50 ppm/°C over −40°C to +125°C - guarantees ≤1.25 mV drift across full extended range, critical for unheated industrial sensors. |
| Dropout Voltage | 120 mV typical at 1 mA - allows regulation from 2.62 V input, supporting single-cell LiFePO₄ or dual-cell alkaline supplies. |
| Supply Current | 160 µA typical - enables >1-year battery life in 10 µA sleep-mode systems with periodic reference activation. |
| Enable Power-Down Current | <2 µA at VEN ≤ 0.2 V - reduces quiescent draw by 80× versus active mode, essential for energy harvesting nodes. |
| Output Noise | 46 µVPP (0.1–10 Hz) - meets 16-bit ADC reference requirements (e.g., ADS8860) without external filtering. |
| Load Drive | ±5 mA source/sink - directly drives SAR ADC reference inputs, op-amp bias networks, or DAC feedback paths. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant tin-silver (CuSn) finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Internally connected; must be left unconnected on PCB to prevent noise injection and capacitive instability. |
| 2 - GND | Ground return | Primary current return path for load, supply, and enable; requires low-inductance connection to minimize ground bounce. |
| 3 - EN | Enable control | Analog input: ≥2.4 V enables output; ≤0.4 V disables output; 6 µA typical pull-up current required for startup. |
| 4 - VIN | Input supply | Accepts 2 V to 12 V; internal LDO structure enables low-dropout operation; bypass capacitor recommended. |
| 5 - VOUT | Reference output | 2.5 V regulated output capable of sourcing/sinking ±5 mA; requires 0.022–0.047 µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to <2 µA - extends battery life in duty-cycled sensor nodes without external switches. |
| Low dropout voltage | 120 mV at 1 mA enables operation from 2.62 V input - supports direct connection to single LiFePO₄ cells (2.5–3.65 V). |
| Source/sink capability | ±5 mA output drive eliminates need for external buffer op-amps when driving ADC references or precision comparators. |
| Stable with small ceramics | 0.022 µF minimum output capacitance - simplifies layout and avoids costly tantalum or polymer capacitors. |
| Industrial temperature range | Specified from −40°C to +85°C - qualified for deployment in automotive cabin modules and factory-floor PLC I/O. |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with 16-bit ADC sampling analog transducer output. IC Role / Device Role / Timing Role: Precision 2.5 V reference for ADC voltage scaling and sensor excitation bias. Use Value: 50 ppm/°C drift ensures <±2 LSB error over patient body temperature range (32–42°C), meeting ISO 15197 accuracy requirements. |
Use Scenario: Modular PLC analog input module measuring 4–20 mA loop signals with cold-junction compensation. IC Role / Device Role / Timing Role: Stable reference for ΣΔ ADC and thermocouple amplifier gain-setting resistors. Use Value: 120 mV dropout allows direct regulation from 3.3 V system rail, eliminating dedicated LDO and reducing BOM count. |
| Battery-Powered Test Equipment | Automotive Cabin Electronics |
Use Scenario: Handheld multimeter with autoranging and auto-zero functions requiring stable reference during battery voltage sag. IC Role / Device Role / Timing Role: Primary voltage reference for dual-slope integrator and display driver bias network. Use Value: 160 µA supply current enables >500 hours of continuous operation on two AA cells; enable pin synchronizes reference activation with measurement cycle. |
Use Scenario: In-vehicle air quality sensor using NDIR CO₂ detection with temperature-compensated photodiode amplifier. IC Role / Device Role / Timing Role: Low-noise 2.5 V reference for transimpedance amplifier feedback and ADC reference. Use Value: 46 µVPP (0.1–10 Hz) noise ensures <0.01% full-scale error in 12-bit CO₂ concentration calculation, satisfying UNECE R155 functional safety constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA25+ | 0.04% initial accuracy, 3 ppm/°C TC, 1.2 µA supply current - higher precision but no enable pin. | Used in metrology-grade calibrators where long-term stability outweighs power-down flexibility. | Select when sub-ppm TC and <10 ppm total error budget are mandatory; accept added cost and lack of shutdown control. |
| ADR3425ARJZ-R7 | 0.1% initial accuracy, 10 ppm/°C TC, 120 µA supply current, no enable - fixed 2.5 V output in SOT-23-5. | Preferred in space-constrained IoT edge nodes where lowest quiescent current and proven field reliability are prioritized. | Select when enable functionality is unnecessary and 10 ppm/°C TC suffices for ambient-temperature-stable deployments. |
Compared with MAX6126AASA25+ and ADR3425ARJZ-R7, the LM4120IM5X-2.5 uniquely balances moderate accuracy (±0.5%), ultra-low dropout (120 mV), and integrated enable control - making it optimal for cost-sensitive, battery-operated systems needing dynamic power management without sacrificing industrial-grade temperature performance.
Availability
LM4120IM5X-2.5 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, and battery-powered test equipment requiring stable component supply with consistent lead times and volume pricing.
Supply support for LM4120IM5X-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 and embedded processing technologies, with decades of expertise in precision analog ICs and high-reliability power management solutions.
The LM4120 series was engineered for low-power, high-accuracy voltage referencing in space- and energy-constrained systems - targeting portable instrumentation, industrial sensing, and automotive subsystems where dropout, noise, and enable control are critical.
FAQ
What is the maximum input voltage rating for the LM4120IM5X-2.5?
The LM4120IM5X-2.5 has an absolute maximum input voltage rating of 14 V on the VIN pin. Operation above this level risks permanent damage. For reliable long-term use, TI specifies a recommended operating range of 2 V to 12 V - ensuring stable 2.5 V output with ≤120 mV dropout at 1 mA load within that span. Exceeding 12 V may degrade accuracy or accelerate aging.
Does the LM4120IM5X-2.5 require an external output capacitor, and if so, what value?
Yes, the LM4120IM5X-2.5 requires an external output capacitor for stability and transient response. TI specifies a minimum of 0.022 µF ceramic capacitor between VOUT and GND. Values up to 0.047 µF ceramic are fully supported; larger values (up to 1 µF) require tantalum construction and additional 50-pF capacitor between VOUT and REF. Omitting the capacitor risks oscillation under load changes.
How does the enable pin function on the LM4120IM5X-2.5, and what are its voltage thresholds?
The enable pin (Pin 3) controls LM4120IM5X-2.5 operation: pulling it to VIN (≥2.4 V) enables the output; pulling it to GND (≤0.4 V) disables it, reducing supply current to <2 µA. It draws ~6 µA during startup and requires ≥0.003 V/µs slew rate to avoid output glitches. Floating the pin is not permitted - it must be actively driven high or low.
What is the significance of the 'IM5X' suffix in LM4120IM5X-2.5?
The 'IM5X' suffix in LM4120IM5X-2.5 denotes the SOT-23-5 (DBV) package with tape-and-reel packaging (X = 3000-unit reel) and industrial temperature grade (−40°C to +85°C). The 'I' indicates standard-grade accuracy (±0.5%), distinct from 'A' grade (±0.2%). 'M5' confirms the 5-pin SOT-23 form factor, and '/NOPB' confirms RoHS-compliant lead-free finish.
Can the LM4120IM5X-2.5 sink current, and how much?
Yes, the LM4120IM5X-2.5 can both source and sink up to ±5 mA from its VOUT pin. This bidirectional capability allows it to actively regulate against capacitive loads, drive op-amp inputs in inverting configurations, or serve as a precision current sink in programmable bias circuits - all while maintaining 2.5 V output within specified line/load regulation limits.
LM4120IM5X-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:
- 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 FAQ
1.How can I place an order for LM4120IM5X-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-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 LM4120IM5X-2.5 reliable?
The price and inventory of LM4120IM5X-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 LM4120IM5X-2.5 is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-2.5?
LM4120IM5X-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-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 LM4120IM5X-2.5?
For technical support, including LM4120IM5X-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-2.5 requirements.
6.How does Aetrix verify that LM4120IM5X-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-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 LM4120IM5X-2.5 meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-2.5?
All LM4120IM5X-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-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 LM4120IM5X-2.5 part is unused and in its original packaging.
Return procedure for LM4120IM5X-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5X-2.5 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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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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AZ431LANTR-G1
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