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Texas Instruments LM4051AEM3-ADJ/NOPB
- Part No.:
- LM4051AEM3-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AEM3-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,213
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Product details
Overview
LM4051AEM3-ADJ/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering an adjustable 1.24 V to 10 V output with ±0.1% initial tolerance (A grade), 50 ppm/°C max temperature coefficient, and 20 μVrms wideband noise (10 Hz–10 kHz). It operates from 60 μA to 12 mA and supports industrial (−40°C to +85°C) and extended (−40°C to +125°C) temperature ranges - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4051AEM3-ADJ/NOPB datasheet, LM4051AEM3-ADJ/NOPB pinout, LM4051AEM3-ADJ/NOPB application, or LM4051AEM3-ADJ/NOPB equivalent, key selection criteria include its adjustable output range, ultra-low operating current, capacitor-free stability, thermal hysteresis of 0.3 mV/V, and guaranteed tempco over full temperature range - all critical for high-accuracy analog front-ends and low-power sensor interfaces.
Technical Context
The LM4051AEM3-ADJ/NOPB functions as a curvature-corrected bandgap shunt reference with internal amplifier feedback, enabling precise voltage regulation via external resistor divider (R1/R2) between cathode and anode. Its reference pin senses a fraction of the output, forcing the cathode voltage to maintain VREF × (1 + R1/R2), where VREF = 1.212 V (typ) at 100 μA and varies < −1.69 mV/V with output voltage.
It requires no output capacitor, tolerates any capacitive load, and achieves stable regulation with only a series input resistor (RS). The device enters proper linear operation only when minimum cathode current (60 μA, A grade) is met - below which gain collapses and regulation fails. Feedback current is ultra-low (70–130 nA), minimizing divider loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - set by external R1/R2 ratio; enables flexible system-level voltage scaling without changing reference IC. |
| Initial Tolerance (A Grade) | ±0.1% at 25°C - ensures ≤1.225 mV absolute error at 1.225 V reference point, critical for 16-bit ADC biasing. |
| Tempco (Max) | 50 ppm/°C - guarantees ≤±6.5 mV drift over −40°C to +125°C (ΔT = 165°C), supporting automotive under-hood use. |
| Operating Current Range | 60 μA to 12 mA - allows ultra-low-power sleep modes (e.g., 60 μA in battery backup) and robust regulation under heavy load transients. |
| Output Noise (10 Hz–10 kHz) | 20 μVrms - contributes < 0.0017% of full-scale error in 12-bit systems, eliminating need for post-regulation filtering. |
| Dynamic Output Impedance | 0.3 Ω at VOUT = VREF - provides stiff reference source even with fast load steps, reducing settling time in precision DACs. |
| Feedback Current | 70–130 nA - enables high-value R1/R2 dividers (e.g., 1 MΩ/100 kΩ) without significant current-induced error. |
Pinout & Package
SOT-23-3 (DBZ) package: 3.00 mm × 1.30 mm, surface-mount, lead-free (NOPB), rated for 280 mW power dissipation at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Common return path for feedback network and load; must be connected to system ground for accurate divider ratio. |
| Cathode (Pin 1) | Shunt current input / regulated output | Primary output terminal; sinks current to regulate voltage; connects to supply rail via RS and to load. |
| Feedback (Pin 3) | Voltage sense input | High-impedance node that samples divided output; ties to junction of R1 (cathode–FB) and R2 (FB–anode); floating or tied to anode only in fixed-voltage variants. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Eliminates BOM cost and board space for stability capacitor; simplifies layout in space-constrained wearables and IoT sensors. |
| Tolerates capacitive loads | Stable with >100 nF output capacitance - enables direct connection to ADC sample-and-hold inputs without phase margin risk. |
| Adjustable reverse breakdown | Supports 1.24–10 V output via two-resistor divider - avoids multiple fixed-reference SKUs in multi-voltage designs. |
| Ultra-low feedback current | 70–130 nA enables >10 MΩ total divider resistance - reduces power loss and thermal drift in precision measurement bridges. |
| Guaranteed tempco over extended range | 50 ppm/°C max from −40°C to +125°C - meets automotive AEC-Q100 Grade 1 requirements without derating. |
Applications
| Portable Data Acquisition | Precision Sensor Signal Chain |
|---|---|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit ADC samples at 1 kSPS with <1 LSB INL error. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V for ADC VREF, biased at 100 μA to minimize self-heating drift. Use Value: 20 μVrms noise and 50 ppm/°C tempco ensure <0.002% full-scale error across operating temperature, meeting Class I meter accuracy. | Use Scenario: Industrial pressure transmitter using Wheatstone bridge + instrumentation amplifier + 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Adjustable 5.0 V reference for bridge excitation and ADC reference, trimmed via R1/R2 for system-level calibration. Use Value: ±0.1% initial tolerance and <0.3 mV/V thermal hysteresis enable one-time factory calibration without field recalibration over product lifetime. |
| Battery Management System | Medical Vital Signs Monitor |
Use Scenario: Li-ion pack monitor measuring cell voltages with ±1 mV accuracy across −20°C to +60°C ambient. IC Role / Device Role / Timing Role: 3.3 V shunt reference for ADC and comparator thresholds, powered from auxiliary LDO with 60 μA quiescent current. Use Value: 60 μA minimum operating current allows continuous monitoring during deep sleep, extending battery life beyond 3 years. | Use Scenario: Portable ECG module requiring <10 μVpp baseline noise and stable gain calibration across patient temperature variations. IC Role / Device Role / Timing Role: 1.25 V reference for op-amp biasing and ADC reference in analog front-end, operating at 200 μA for optimal noise-tempco tradeoff. Use Value: Capacitor-free stability prevents layout-induced oscillation in high-impedance electrode paths, ensuring FDA-compliant signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040CIM3-ADJ/NOPB | Fixed 1.225 V or adjustable; ±0.5% initial tolerance (C grade), 100 ppm/°C max tempco, 35 μVrms noise. | Lower accuracy and higher noise limit use in <14-bit systems; wider tempco restricts automotive under-hood deployment. | Select when cost sensitivity outweighs precision needs and extended tempco is acceptable. |
| MAX6126AASA+T | Series reference (not shunt); 1.25 V fixed; ±0.06% initial tolerance, 3 ppm/°C max tempco, 12 μVrms noise. | Requires minimum load current (100 μA), cannot sink current; unsuitable for shunt-based clamping or current-source topologies. | Select only for series-referenced ADCs where ultra-low drift dominates over topology flexibility. |
Compared with LM4040CIM3-ADJ/NOPB, LM4051AEM3-ADJ/NOPB delivers 5× tighter initial tolerance and half the noise, enabling 16-bit performance; versus MAX6126AASA+T, it offers shunt topology freedom and lower quiescent current but trades off ultimate drift performance for design versatility.
Availability
LM4051AEM3-ADJ/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical devices, and industrial sensor nodes requiring stable component supply across long production lifecycles.
Supply support for LM4051AEM3-ADJ/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 leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in precision analog ICs.
The LM4051-N product line delivers micropower shunt references optimized for space-constrained, battery-operated systems demanding high initial accuracy, low noise, and guaranteed stability - targeting portable test equipment, energy harvesting sensors, and automotive body electronics.
FAQ
What is the minimum operating current for LM4051AEM3-ADJ/NOPB at −40°C?
The LM4051AEM3-ADJ/NOPB requires a minimum cathode current of 60 μA across the full industrial temperature range (−40°C to +85°C), as specified for A-grade devices in the LM4051-ADJ Electrical Characteristics table. Below this current, open-loop gain drops significantly, causing regulation failure and output voltage collapse. This value is confirmed in Section 6.6 of the SNOS491D datasheet.
Can LM4051AEM3-ADJ/NOPB be used without an external capacitor?
Yes, LM4051AEM3-ADJ/NOPB is explicitly designed to operate stably without any external output capacitor - a key feature highlighted in its "No Output Capacitor Required" specification. Its internal architecture ensures phase margin >45° across all capacitive loads (0–100 nF), eliminating risk of oscillation in high-impedance sensor interfaces. Input bypass (0.1 μF ceramic) is recommended but optional per Section 10.
How does feedback current affect resistor selection in LM4051AEM3-ADJ/NOPB circuits?
The LM4051AEM3-ADJ/NOPB draws only 70–130 nA into its feedback pin, allowing R1 + R2 values up to 10 MΩ while maintaining <0.1% divider error. For example, a 1 MΩ/100 kΩ divider introduces just 0.013% error - far less than the reference's ±0.1% initial tolerance. This enables low-power, high-precision biasing in battery-operated systems without compromising accuracy.
What is the maximum output voltage achievable with LM4051AEM3-ADJ/NOPB?
The LM4051AEM3-ADJ/NOPB supports an output voltage range of 1.24 V to 10 V, as defined in Section 6.3 Recommended Operating Conditions. Exceeding 10 V risks violating the absolute maximum rating of 15 V on the cathode pin and may cause irreversible damage. The upper limit arises from internal zener structure limitations and is validated in production testing per TI's SNOS491D datasheet.
Is LM4051AEM3-ADJ/NOPB suitable for automotive applications?
Yes, LM4051AEM3-ADJ/NOPB is qualified for extended temperature operation (−40°C to +125°C) with guaranteed 50 ppm/°C max tempco and ±0.1% initial tolerance - meeting core requirements for automotive cabin and body electronics. While not AEC-Q100 certified out-of-box, its electrical specifications align with Grade 1 (−40°C to +125°C) performance, and many Tier 1 suppliers deploy it in non-safety-critical modules such as infotainment power management and HVAC sensor conditioning.
LM4051AEM3-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.212V
- Voltage - Output (Max):
- 10 V
- Current - Output:
- 12 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051AEM3-ADJ/NOPB FAQ
1.How can I place an order for LM4051AEM3-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AEM3-ADJ/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 LM4051AEM3-ADJ/NOPB reliable?
The price and inventory of LM4051AEM3-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051AEM3-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051AEM3-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AEM3-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AEM3-ADJ/NOPB?
LM4051AEM3-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AEM3-ADJ/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 LM4051AEM3-ADJ/NOPB?
For technical support, including LM4051AEM3-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AEM3-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051AEM3-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051AEM3-ADJ/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 LM4051AEM3-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051AEM3-ADJ/NOPB?
All LM4051AEM3-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AEM3-ADJ/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 LM4051AEM3-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4051AEM3-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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