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Texas Instruments LM4120IM5X-3.3/NOPB
- Part No.:
- LM4120IM5X-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5X-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,954
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Product details
Overview
LM4120IM5X-3.3/NOPB 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-designed for stable biasing in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4120IM5X-3.3/NOPB datasheet, LM4120IM5X-3.3/NOPB pinout, LM4120IM5X-3.3/NOPB application, or LM4120IM5X-3.3/NOPB equivalent, key selection criteria include enable-controlled power-down (ISS < 2 µA), ±5 mA source/sink capability, SOT-23-5 package compatibility, and industrial temperature range (−40°C to 85°C) operation without external compensation.
Technical Context
The LM4120IM5X-3.3/NOPB implements a trimmed bandgap core with internal error amplifier and pass transistor, enabling regulation down to VIN = VOUT + 120 mV (typ). Its enable pin accepts TTL/CMOS logic levels (VH ≥ 2.4 V, VL ≤ 0.4 V) and draws only 6 µA typical during startup.
Operation is specified across −40°C to 85°C ambient, with key parameters-including line regulation (0.008%/V), load regulation (0.04%/mA from 1–5 mA), and 36 µVPP (10 Hz–10 kHz) output noise-validated over this range. The REF pin is unconnected and must be isolated from noise and capacitive loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±0.5% initial accuracy - ensures stable ADC/DAC reference or regulator feedback without calibration. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - limits drift to ±16.5 ppm over full industrial range (−40°C to 85°C). |
| Dropout Voltage | 120 mV typical at 1 mA - enables operation from 3.42 V input, critical for single-cell Li-ion or 3.3 V rail margining. |
| Supply Current | 160 µA typical - supports >1-year battery life in 10 µA sleep-mode systems with periodic wake-up. |
| Power-Down Current | <2 µA at EN ≤ 0.2 V - reduces quiescent draw by 80×, enabling long-term shutdown in remote sensors. |
| Output Drive | ±5 mA source/sink - directly drives 10-bit SAR ADC reference inputs or op-amp bias networks without buffering. |
| Input Voltage Range | 2 V to 12 V - accommodates wide-input DC-DC outputs or unregulated battery stacks without pre-regulation. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant with Sn lead finish and Level-1 MSL rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Must remain unconnected; sensitive to noise and capacitance - requires guard ring and no routing nearby. |
| 2 - GND | Ground return | Primary current return path for load, supply, and enable; connects to low-impedance ground plane. |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for active mode; pulled to VIN for always-on use or driven by microcontroller GPIO. |
| 4 - VIN | Positive supply input | Accepts 2–12 V; bypass capacitor (≥0.1 µF ceramic) recommended near pin to suppress PSRR degradation. |
| 5 - VOUT | Regulated output | 3.3 V reference output capable of sourcing/sinking ±5 mA; requires 0.022–0.047 µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 120 mV typical at 1 mA - enables direct regulation from 3.42 V sources, eliminating need for boost or LDO pre-regulator. |
| Enable-controlled shutdown | ISS < 2 µA with EN ≤ 0.2 V - cuts supply current by 80×, extending battery life in duty-cycled sensor nodes. |
| Source/sink capability | ±5 mA output drive - eliminates external buffer for driving ADC references, DAC feedback, or comparator thresholds. |
| Stable with small ceramics | 0.022 µF minimum COUT - avoids tantalum or electrolytic capacitors, reducing board area and improving reliability. |
| Industrial temperature range | −40°C to 85°C operation - validated performance across automotive cabin, industrial PLC, and outdoor IoT environments. |
Applications
| Portable Instrumentation | Battery-Powered Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and analog front-end gain calibration. Use Value: ±0.5% initial accuracy and 50 ppm/°C drift ensure <0.1% measurement error across operating temperature without recalibration. |
Use Scenario: Wireless environmental sensor node logging temperature/humidity with 12-bit ADC. IC Role / Device Role / Timing Role: Stable reference for ADC and internal LDO feedback, powered intermittently from coin cell. Use Value: 160 µA supply current and <2 µA shutdown enable multi-year battery life with 1-minute sampling intervals. |
| Precision Regulator Feedback | Medical Diagnostic Equipment |
|
Use Scenario: Low-noise 3.3 V LDO supplying analog signal chain in portable ultrasound front-end. IC Role / Device Role / Timing Role: Reference for LDO error amplifier, setting output voltage with high PSRR and low noise. Use Value: 36 µVPP (10 Hz–10 kHz) output noise and 0.008%/V line regulation minimize ripple coupling into sensitive analog paths. |
Use Scenario: Portable ECG monitor requiring stable 3.3 V rail for analog front-end and digital controller. IC Role / Device Role / Timing Role: Primary reference for ADC, DAC, and programmable gain amplifier calibration. Use Value: ±5 mA drive capability supports simultaneous biasing of multiple op-amps and ADC inputs without external buffers. |
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%), same package, tempco, and dropout. | Required where absolute reference accuracy dominates system error budget (e.g., metrology-grade calibrators). | Select when higher initial accuracy justifies cost premium; identical pinout and layout. |
| REF3033AIDBZR | ±0.2% accuracy, 50 ppm/°C, but 3.3 V fixed output only; 55 µA supply current (vs. 160 µA). | Better suited for ultra-low-power always-on monitoring where 3.3 V is fixed and accuracy is critical. | Prefer when supply current is primary constraint and accuracy requirement exceeds LM4120IM5X-3.3/NOPB capability. |
Compared with LM4120AIM5X-3.3/NOPB, the LM4120IM5X-3.3/NOPB trades 0.3% initial accuracy for lower cost while retaining identical thermal, dropout, and enable behavior; versus REF3033AIDBZR, it offers higher drive strength (±5 mA vs. ±25 mA sink only) and wider input range (2–12 V vs. 2.2–5.5 V), at higher quiescent current.
Availability
LM4120IM5X-3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and precision regulator feedback requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4120IM5X-3.3/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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad portfolio coverage from design-in through production.
The LM4120 series was developed for micropower, low-dropout voltage reference applications in space-constrained, battery-operated systems where accuracy, stability, and enable-controlled shutdown are essential.
FAQ
What is the maximum input voltage for LM4120IM5X-3.3/NOPB?
The LM4120IM5X-3.3/NOPB supports a maximum input voltage of 14 V under absolute maximum ratings, but recommended operation is limited to 12 V. Exceeding 12 V risks accelerated parametric shift and reduced long-term stability, especially at elevated temperatures. For continuous operation, maintain VIN ≤ 12 V with adequate derating per thermal conditions.
Does LM4120IM5X-3.3/NOPB require an output capacitor?
Yes, LM4120IM5X-3.3/NOPB requires a minimum 0.022 µF ceramic output capacitor for loop stability. 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 pins. Omitting COUT risks oscillation and degraded transient response.
Can the REF pin of LM4120IM5X-3.3/NOPB be connected to ground or left floating?
Neither. The REF pin of LM4120IM5X-3.3/NOPB must remain unconnected (open) in all configurations. Connecting it to ground, VOUT, or any other node violates the internal bandgap architecture and causes output inaccuracy or instability. PCB layout must isolate REF with guard rings and avoid routing traces or vias nearby.
What is the power-down behavior of LM4120IM5X-3.3/NOPB when EN is grounded?
When EN is pulled to ≤0.2 V, LM4120IM5X-3.3/NOPB enters power-down mode with supply current dropping to <2 µA and VOUT disabled (high-impedance state). Output recovery time is typically 100 µs after EN rises above 2.4 V. The device does not latch - repeated EN toggling is fully supported without degradation.
Is LM4120IM5X-3.3/NOPB suitable for automotive under-hood applications?
No. LM4120IM5X-3.3/NOPB is rated for −40°C to 85°C ambient operation and is not qualified for automotive under-hood (−40°C to 125°C junction) use. While some parameters are ensured to 125°C, full specification compliance-including long-term stability and thermal hysteresis-is only guaranteed to 85°C ambient. For extended temperature, contact TI for LM4120 variants or consider AEC-Q100-qualified alternatives.
LM4120IM5X-3.3/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):
- 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/NOPB FAQ
1.How can I place an order for LM4120IM5X-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5X-3.3/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 LM4120IM5X-3.3/NOPB reliable?
The price and inventory of LM4120IM5X-3.3/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM4120IM5X-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5X-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5X-3.3/NOPB?
LM4120IM5X-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5X-3.3/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 LM4120IM5X-3.3/NOPB?
For technical support, including LM4120IM5X-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5X-3.3/NOPB requirements.
6.How does Aetrix verify that LM4120IM5X-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4120IM5X-3.3/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 LM4120IM5X-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4120IM5X-3.3/NOPB?
All LM4120IM5X-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5X-3.3/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 LM4120IM5X-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4120IM5X-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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