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Texas Instruments LM4120IM5X-3.3
- Part No.:
- LM4120IM5X-3.3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-3.3.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,883
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Product details
Overview
LM4120IM5X-3.3 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 3.3 V output with ±0.5% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load. It features enable control, ±5 mA source/sink capability, and 160 µA typical supply current-designed for high-accuracy analog sensing and ADC/DAC biasing in space-constrained portable systems.
For engineers reviewing the LM4120IM5X-3.3 datasheet, LM4120IM5X-3.3 pinout, LM4120IM5X-3.3 application, or LM4120IM5X-3.3 equivalent, key selection criteria include industrial-grade temperature stability (−40°C to 85°C), SOT-23-5 package compatibility, power-down current <2 µA, and fixed 3.3 V output without external trimming.
Technical Context
The LM4120IM5X-3.3 implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling operation down to VIN = VOUT + 120 mV. Its enable pin controls analog startup/shutdown with logic-compatible thresholds (VH = 2.4 V, VL = 0.4 V) and <6 µA input current, supporting remote power gating in battery-critical designs.
It maintains output regulation across 2 V to 12 V input range while rejecting line variations (0.008 %/V) and load shifts (0.04 %/mA over 1–5 mA), with 36 µVPP broadband noise (10 Hz–10 kHz) and 170.4 °C/W junction-to-ambient thermal resistance in the SOT-23-5 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V fixed, ±0.5% initial accuracy at 25°C - eliminates calibration in mid-precision data acquisition systems. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - ensures ≤1.65 mV drift over full industrial range, critical for stable sensor excitation. |
| Dropout Voltage | 120 mV typical at 1 mA - enables operation from single-cell Li-ion (3.0 V min) or regulated 3.3 V rails with margin. |
| Supply Current | 160 µA typical - extends battery life in always-on monitoring nodes; drops to <2 µA in power-down mode. |
| Load Drive | ±5 mA source/sink - directly drives SAR ADC reference inputs, op-amp bias networks, or small DACs without buffering. |
| Enable Thresholds | VH = 2.4 V, VL = 0.4 V - compatible with standard CMOS/TTL logic for clean, glitch-free power sequencing. |
| Output Noise | 36 µVPP (10 Hz–10 kHz) - supports 14-bit+ resolution in precision measurement front-ends. |
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 |
|---|---|---|
| 1: REF | Reference node | Must remain unconnected; sensitive to noise and capacitive loading - requires isolation in PCB layout. |
| 2: GND | Ground reference | Primary return path for load and supply currents; connects to system ground plane for noise control. |
| 3: EN | Enable input | Analog control pin: pulled to VIN for normal operation; grounded to disable output and reduce current to <2 µA. |
| 4: VIN | Input supply | Accepts 2 V to 12 V; must be bypassed with ≥0.1 µF ceramic capacitor near pin for transient immunity. |
| 5: VOUT | Reference output | 3.3 V precision output; requires 0.022–0.047 µF ceramic capacitor (low ESR) for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 120 mV typical at 1 mA enables use with ultra-low headroom supplies like coin cells or post-LDO rails. |
| Enable-Controlled Power-Down | Reduces quiescent current to <2 µA - essential for duty-cycled IoT sensors and wake-on-event architectures. |
| Source/Sink Capability | ±5 mA drive strength allows direct interface to ADC reference pins, op-amp feedback networks, and voltage-controlled loads. |
| Industrial Temperature Range | Specified performance from −40°C to +85°C - suitable for automotive cabin modules, industrial PLC I/O, and outdoor instrumentation. |
| No External Trimming Required | Fixed 3.3 V output with factory-trimmed accuracy eliminates calibration steps and reduces BOM count in volume production. |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld multimeter or environmental sensor node operating from single Li-ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: Provides stable 3.3 V reference for 16-bit SAR ADC and microcontroller VREF, enabling accurate voltage/current/temperature measurements. Use Value: 120 mV dropout ensures full-range operation down to 3.0 V cell voltage; 160 µA supply current extends runtime beyond 1 year on 1000 mAh battery. |
Use Scenario: Remote soil moisture or air quality monitor powered by AA batteries with periodic 10-second sampling bursts. IC Role / Device Role / Timing Role: Supplies precision bias to analog front-end and ADC during active measurement windows; disabled between samples. Use Value: <2 µA shutdown current minimizes standby drain; ±0.5% accuracy maintains measurement traceability across temperature swings in uncontrolled environments. |
| Industrial Process Transmitters | Medical Vital Sign Monitors |
Use Scenario: 4–20 mA loop-powered pressure transmitter in factory automation systems. IC Role / Device Role / Timing Role: Generates calibrated 3.3 V reference for signal conditioning circuitry and digital isolator biasing. Use Value: 50 ppm/°C tempco ensures ≤0.1% full-scale error over −40°C to +85°C ambient, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: Portable ECG or pulse oximeter requiring low-noise, stable reference for analog signal chain. IC Role / Device Role / Timing Role: Supplies low-noise 3.3 V reference to instrumentation amplifiers and 24-bit delta-sigma ADC. Use Value: 36 µVPP (10 Hz–10 kHz) noise supports >100 dB SNR; ±5 mA drive eliminates need for external buffer op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4120AIM5X-3.3/NOPB | 0.2% initial accuracy (vs. 0.5% for LM4120IM5X-3.3); same package, tempco, and pinout. | Required where tighter initial tolerance is needed for calibration-free medical or test equipment. | Select when absolute accuracy at power-up outweighs cost sensitivity; otherwise LM4120IM5X-3.3 suffices for industrial control. |
| MAX6126AASA33+ | 0.1% initial accuracy, 3 ppm/°C tempco, 1.8 µA supply current; SO-8 package (not pin-compatible). | Used in high-end metrology or aerospace where long-term stability and ultra-low drift dominate. | Choose only if upgrading to higher-precision tier and redesigning PCB layout; not a drop-in replacement. |
Compared with LM4120AIM5X-3.3/NOPB, the LM4120IM5X-3.3 trades 0.3% initial accuracy for lower cost and identical footprint; versus MAX6126AASA33+, it offers SOT-23-5 miniaturization and proven industrial reliability at higher noise and drift-but avoids SO-8 layout changes and premium pricing.
Availability
LM4120IM5X-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process transmitters requiring stable component supply with consistent lead times and full traceability.
Supply support for LM4120IM5X-3.3 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 industrial-grade reliability.
The LM4120 series was engineered for low-power, high-accuracy voltage referencing in space-constrained, battery-sensitive applications-emphasizing micropower operation, low dropout, and robust industrial temperature performance.
FAQ
What is the guaranteed temperature coefficient for LM4120IM5X-3.3 over its full operating range?
The LM4120IM5X-3.3 guarantees a temperature coefficient of 50 ppm/°C across −40°C to +125°C, with performance validated over the industrial range (−40°C to +85°C) per datasheet Section 6.5. This ensures predictable output drift in demanding environments without requiring external compensation circuits.
Can LM4120IM5X-3.3 operate from a 3.0 V input supply?
Yes - LM4120IM5X-3.3 supports input voltages as low as 2 V and delivers regulated 3.3 V output with 120 mV typical dropout at 1 mA. At 3.0 V input, it maintains regulation with ≥1.8 V headroom, making it viable for single-cell Li-ion (3.0 V minimum) and low-voltage industrial rails.
What is the maximum load current LM4120IM5X-3.3 can source or sink while maintaining specification?
The LM4120IM5X-3.3 is specified for ±5 mA source/sink current. Within this range, load regulation remains ≤0.04 %/mA (1–5 mA), ensuring output deviation stays within ±0.132 mV at full 5 mA load - sufficient for driving most ADC references and op-amp bias networks directly.
Is the REF pin on LM4120IM5X-3.3 required to connect externally?
No - the REF pin (Pin 1) on LM4120IM5X-3.3 must remain unconnected in all applications. It is an internal reference node sensitive to noise and capacitive loading; connecting it risks instability or accuracy degradation. PCB layout must isolate this pin from traces and copper pours.
Does LM4120IM5X-3.3 require an output capacitor, and what value is recommended?
Yes - LM4120IM5X-3.3 requires a minimum 0.022 µF ceramic output capacitor for stability. The datasheet recommends 0.022–0.047 µF (X7R or C0G dielectric, ESR <0.5 Ω); larger values up to 1 µF are allowed but require tantalum construction and additional 50 pF capacitor between VOUT and REF for stability.
LM4120IM5X-3.3 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):
- 3.3V
- 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-3.3 FAQ
1.How can I place an order for LM4120IM5X-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-3.3 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-3.3 reliable?
The price and inventory of LM4120IM5X-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5X-3.3 is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-3.3?
LM4120IM5X-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-3.3 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-3.3?
For technical support, including LM4120IM5X-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-3.3 requirements.
6.How does Aetrix verify that LM4120IM5X-3.3 is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-3.3?
All LM4120IM5X-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LM4120IM5X-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5X-3.3 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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