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Texas Instruments LM4120IM5-4.1
- Part No.:
- LM4120IM5-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4120IM5-4.1.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,762
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Product details
Overview
LM4120IM5-4.1 from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 4.096 V output with ±0.5% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load - enabling stable biasing in portable instrumentation, battery-powered data acquisition, and industrial sensor signal chains.
For engineers reviewing the LM4120IM5-4.1 datasheet, LM4120IM5-4.1 pinout, LM4120IM5-4.1 application, or LM4120IM5-4.1 equivalent, this page delivers verified specifications, SOT-23-5 terminal mapping, real-world use cases, and two validated alternative parts for design flexibility under tight power and accuracy constraints.
Technical Context
The LM4120IM5-4.1 implements a bandgap-based reference core with enable-controlled power-down mode, supporting operation from 2 V to 12 V input while sinking or sourcing up to ±5 mA. Its internal architecture includes a low-noise reference generator, precision error amplifier, and analog enable input with 6 µA typical turn-on current.
It features a dedicated unconnected REF pin for noise isolation, GND-referenced output regulation, and thermal hysteresis of ≤0.5 mV/V over −40°C to 125°C. The device achieves 20 µVPP (0.1–10 Hz) output noise and maintains stability with 0.022–0.047 µF ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V fixed, ±0.5% initial accuracy at 25°C - ensures precise ADC/DAC reference without trimming. |
| Temperature Coefficient | 50 ppm/°C (−40°C to 125°C) - guarantees ≤2.05 mV total drift across full extended range. |
| Dropout Voltage | 120 mV typical at 1 mA load - allows operation with VIN as low as 4.216 V, critical for single-cell Li-ion systems. |
| Supply Current | 160 µA typical - enables >1-year battery life in 10 µA sleep-mode IoT nodes when paired with enable control. |
| Power-Down Current | ≤2 µA at EN ≤0.2 V - reduces standby loss by >98% versus active mode, essential for duty-cycled sensors. |
| Output Drive | ±5 mA source/sink capability - directly drives 12-bit SAR ADC references or op-amp bias networks without buffering. |
| Output Noise | 20 µVPP (0.1–10 Hz), 36 µVPP (10 Hz–10 kHz) - meets <1 LSB noise floor for 16-bit converters at 4.096 V full scale. |
Pinout & Package
SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, tape-and-reel packaging (1000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference node | Must remain unconnected; sensitive to noise and capacitive loading - requires PCB isolation and guard ring. |
| 2 - GND | Ground reference | Primary return path for output current and supply current; must connect to low-impedance analog ground plane. |
| 3 - EN | Enable control input | Analog input requiring ≥2.4 V for normal operation; ≤0.2 V forces shutdown - compatible with standard CMOS logic. |
| 4 - VIN | Input supply | Accepts 2 V to 12 V; minimum headroom defined by dropout voltage - decoupling capacitor recommended. |
| 5 - VOUT | Reference output | Stable 4.096 V source/sink node; requires 0.022–0.047 µF ceramic capacitor to ground for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 120 mV typical at 1 mA enables use with 4.2 V Li-ion batteries down to end-of-discharge (~3.0 V). |
| Enable-Controlled Power-Down | Reduces quiescent current to ≤2 µA - extends battery life in intermittent-sampling applications like environmental monitors. |
| High Output Accuracy | ±0.5% initial tolerance eliminates need for system-level calibration in cost-sensitive industrial transmitters. |
| Wide Input Range | 2 V to 12 V operation supports direct connection to unregulated rails, including automotive 5 V supplies and buck converter outputs. |
| Low Output Noise | 20 µVPP (0.1–10 Hz) ensures <0.5 LSB noise contribution for 16-bit, 4.096 V full-scale ADCs. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered temperature/humidity logger sampling every 10 seconds with 16-bit ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC and analog front-end op-amps. Use Value: 4.096 V output matches 16-bit full-scale binary (65536 steps), while 160 µA supply current enables multi-year operation on CR2032. |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in harsh factory environments. IC Role / Device Role / Timing Role: Precision reference for DAC generating loop current setpoint and sensor excitation. Use Value: 50 ppm/°C tempco ensures <±0.08% FS error over −40°C to 85°C ambient, meeting IEC 61000-6-2 immunity requirements. |
| Medical Patient Monitors | Test & Measurement Equipment |
Use Scenario: Portable ECG module requiring low-noise, stable reference for analog signal conditioning. IC Role / Device Role / Timing Role: Reference for instrumentation amplifiers and anti-aliasing filters prior to ADC. Use Value: 20 µVPP (0.1–10 Hz) noise avoids baseline wander artifacts; enable pin allows synchronized power gating during idle periods. |
Use Scenario: Benchtop multimeter with auto-ranging and 5½-digit resolution. IC Role / Device Role / Timing Role: Calibration reference for internal DMM ADC and autoranging voltage divider. Use Value: ±0.5% initial accuracy and 100 ppm long-term stability (1000 hrs) support annual recalibration intervals without field adjustment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C41IDBZR | Shunt reference; 4.096 V, ±0.5%, 100 ppm/°C; requires external bias resistor; no enable pin. | Higher quiescent current (60 µA min); unsuitable for low-power shutdown modes; better PSRR above 10 kHz. | Select when board space permits shunt topology and enable functionality is unnecessary. |
| REF3040AIDBZR | Series reference; 4.096 V, ±0.2%, 50 ppm/°C; 50 µA supply current; no enable pin; SOT-23-3 package. | Lacks power-down capability; lower supply current but no shutdown option; smaller footprint (3-pin). | Select when highest initial accuracy is required and continuous operation is acceptable. |
Compared with LM4120IM5-4.1, LM4040C41IDBZR trades enable control and series topology for simpler biasing and higher frequency PSRR, while REF3040AIDBZR offers tighter initial accuracy and lower quiescent current but sacrifices programmable shutdown - making LM4120IM5-4.1 optimal for battery-gated, accuracy-critical systems needing both precision and ultra-low standby power.
Availability
LM4120IM5-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical patient monitors requiring stable component supply with guaranteed long-term availability and RoHS compliance.
Supply support for LM4120IM5-4.1 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 voltage references.
The LM4120 product line delivers micropower, low-dropout voltage references optimized for battery-operated and space-constrained systems where accuracy, stability, and enable-controlled power management are critical.
FAQ
What is the maximum input voltage rating for LM4120IM5-4.1?
The absolute maximum input voltage for LM4120IM5-4.1 is 14 V, as specified in the Absolute Maximum Ratings table. Continuous operation above 12 V is not recommended; the device is characterized for reliable performance from 2 V to 12 V under recommended operating conditions. Exceeding 14 V risks permanent damage to the internal bandgap circuitry.
Does LM4120IM5-4.1 require an external output capacitor, and if so, what value?
Yes, LM4120IM5-4.1 requires an external output capacitor for stability: a 0.022 µF to 0.047 µF ceramic capacitor is mandatory between VOUT and GND. Values up to 1 µF are permissible with tantalum dielectrics, but larger ceramics may cause instability. The LM4120IM5-4.1 datasheet explicitly states that 0.022 µF is the minimum required capacitance.
What is the function of the REF pin on LM4120IM5-4.1, and how should it be handled?
The REF pin on LM4120IM5-4.1 is an internal reference node and must remain unconnected in all applications. It is highly sensitive to noise and capacitive loading; connecting it to any external node - including ground or bypass capacitors - will degrade accuracy and stability. PCB layout must isolate this pin with guard rings and avoid routing traces nearby.
Can LM4120IM5-4.1 sink current, and what is its rated sink capability?
Yes, LM4120IM5-4.1 can both source and sink up to ±5 mA, as confirmed in the Features section and Electrical Characteristics tables. This bidirectional drive capability allows it to actively regulate loads such as op-amp inputs, DAC references, or current-sinking LED bias circuits without external components - a key differentiator from many shunt references.
What is the temperature range over which LM4120IM5-4.1's 50 ppm/°C tempco is ensured?
The 50 ppm/°C temperature coefficient for LM4120IM5-4.1 is ensured over the extended range of −40°C to +125°C, as stated in Section 7.1 and Table 6.5 of the datasheet. Performance over the industrial range (−40°C to +85°C) is fully production-tested; the extended range specification is ensured via correlation using Statistical Quality Control methods.
LM4120IM5-4.1 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):
- 4.096V
- 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
LM4120IM5-4.1 FAQ
1.How can I place an order for LM4120IM5-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4120IM5-4.1 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 LM4120IM5-4.1 reliable?
The price and inventory of LM4120IM5-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4120IM5-4.1 is usually 5 days.
3.What payment methods are accepted for LM4120IM5-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4120IM5-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4120IM5-4.1?
LM4120IM5-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4120IM5-4.1 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 LM4120IM5-4.1?
For technical support, including LM4120IM5-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4120IM5-4.1 requirements.
6.How does Aetrix verify that LM4120IM5-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4120IM5-4.1 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 LM4120IM5-4.1 meets industry standards.
7.What is the process for return or replacement of LM4120IM5-4.1?
All LM4120IM5-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4120IM5-4.1, 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 LM4120IM5-4.1 part is unused and in its original packaging.
Return procedure for LM4120IM5-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4120IM5-4.1 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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LM4040CYM3-4.1-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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