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Texas Instruments LM4051BIM3X-ADJ/NOPB
- Part No.:
- LM4051BIM3X-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BIM3X-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,644
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Product details
Overview
LM4051BIM3X-ADJ/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering adjustable 1.24 V to 10 V output with ±0.1% initial tolerance (A-grade), 20 μVrms noise (10 Hz–10 kHz), and 50 ppm/°C max temperature coefficient across −40°C to +125°C. It operates from 60 μA to 12 mA and enables stable regulation in space-constrained battery-powered instrumentation.
For engineers reviewing the LM4051BIM3X-ADJ/NOPB datasheet, LM4051BIM3X-ADJ/NOPB pinout, LM4051BIM3X-ADJ/NOPB application, or LM4051BIM3X-ADJ/NOPB equivalent, key selection considerations include its adjustable output range, no-output-capacitor requirement, low quiescent current, thermal hysteresis of 0.3 mV/V, and compatibility with capacitive loads in portable and industrial sensing systems.
Technical Context
The LM4051BIM3X-ADJ/NOPB implements a curvature-corrected bandgap shunt reference architecture 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 cathode voltage to maintain VREF = 1.212 V at 100 μA, with feedback current specified at 70–130 nA.
It functions as a two-terminal shunt device requiring only an external series resistor (RS) for biasing; regulation occurs by dynamically shunting excess current to ground. The SOT-23-3 package uses pin 3 as the negative output terminal (connected via die attach), distinct from the floating pin 3 in the fixed 1.225 V variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - programmable via external R1/R2 divider; enables flexible system-level voltage scaling without changing reference IC. |
| Initial Tolerance (A-grade) | ±0.1% at 25°C - ensures high-accuracy ADC/DAC biasing and sensor excitation without post-calibration trimming. |
| Tempco (max) | 50 ppm/°C over −40°C to +125°C - guarantees <±5.2 mV drift across full industrial range for stable long-term measurements. |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - supports high-resolution data acquisition where low-noise references prevent quantization errors. |
| Operating Current Range | 60 μA to 12 mA - allows ultra-low-power operation in sleep modes while supporting fast transient response under load changes. |
| Dynamic Output Impedance | 0.3 Ω at 120 Hz (VOUT = VREF) - provides stiff voltage source behavior even with varying load currents in precision analog circuits. |
| Thermal Hysteresis | 0.3 mV/V - limits voltage shift after thermal cycling, critical for repeatable calibration in field-deployed test equipment. |
Pinout & Package
SOT-23-3 package (3.00 mm × 1.30 mm), surface-mount, with gull-wing leads. Pin 3 serves as the negative output terminal (common/anode return) - not floating - and must be connected to system ground or the anode node.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Voltage output / shunt current sink | Regulated positive output node; connects to RS and load; carries full shunt current up to 12 mA. |
| Anode (Pin 2) | Reference ground / common return | System ground connection point; forms return path for feedback current and load current. |
| Feedback (Pin 3) | Reference input / negative output | Internally tied to die cathode; externally connected to anode or ground; defines reference potential for divider network. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with any capacitive load eliminates BOM cost and board area for bypass caps in compact designs. |
| Adjustable output (1.24–10 V) | Enables single reference part to support multiple supply rails or sensor excitation voltages across product variants. |
| Low 60 μA minimum operating current | Extends battery life in portable medical monitors and IoT sensors without sacrificing accuracy or stability. |
| 50 ppm/°C tempco (guaranteed) | Meets Class I precision requirements for industrial process transmitters operating across wide ambient ranges. |
| Tolerates capacitive loads | Eliminates risk of oscillation when driving ADC input filters or op-amp buffers directly, simplifying layout validation. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitoring units sampling temperature, humidity, and gas concentration at 100 kS/s with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V reference for ADC and 3.3 V bias for analog front-end op-amps. Use Value: 20 μVrms noise prevents LSB errors; 60 μA min current extends 10-year battery life; SOT-23-3 footprint saves PCB area. |
Use Scenario: 4–20 mA loop-powered pressure transmitters deployed in oil refineries with ambient temperatures from −40°C to +85°C. IC Role / Device Role / Timing Role: Precision shunt reference setting excitation voltage for bridge sensors and reference for DAC-driven current output stage. Use Value: 50 ppm/°C tempco ensures ≤0.5% full-scale error over temperature; A-grade ±0.1% tolerance eliminates factory calibration. |
| Medical Patient Monitors | Automotive Battery Management Systems |
Use Scenario: Portable ECG devices measuring microvolt-level cardiac signals with simultaneous 12-bit ADC sampling and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Low-noise reference for analog signal conditioning chain and ADC, isolated from digital switching noise. Use Value: No-output-capacitor design avoids EMI coupling paths; 0.3 mV/V thermal hysteresis ensures repeatable baseline during patient warm-up cycles. |
Use Scenario: Cell voltage monitoring ICs in 12S Li-ion packs for EVs, requiring accurate 1.25 V reference for 16-bit delta-sigma ADCs per cell. IC Role / Device Role / Timing Role: Adjustable reference set to 1.25 V for cell ADCs, sharing common ground with isolated CAN interface. Use Value: Pin-compatible upgrade from LM4040; extended −40°C to +125°C range supports under-hood placement; 12 mA max current handles burst sampling. |
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 only; ±0.5% initial tolerance (C-grade); 35 μVrms noise; requires external capacitor for stability with >1 nF loads. | Limited to fixed-voltage use cases; higher noise degrades 16-bit+ resolution; less suitable for low-power wake-up circuits. | Select when cost sensitivity outweighs accuracy/noise requirements and output voltage is fixed. |
| MAX6008AEUR+T | 1.25 V fixed output; ±0.2% initial tolerance; 25 μVrms noise; 100 μA min operating current; SOT-23-3 package. | Not adjustable; higher quiescent current reduces battery life; optimized for automotive AEC-Q200 compliance but lacks extended temp range. | Choose for AEC-Q200 qualified designs where 1.25 V is sufficient and automotive qualification is mandatory. |
Compared with LM4051BIM3X-ADJ/NOPB, LM4040CIM3-ADJ/NOPB trades adjustability and noise performance for lower cost, while MAX6008AEUR+T offers automotive qualification at the expense of programmability and micropower capability - making LM4051BIM3X-ADJ/NOPB optimal for high-accuracy, battery-sensitive, and thermally demanding industrial applications.
Availability
LM4051BIM3X-ADJ/NOPB 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 consistent parametric performance.
Supply support for LM4051BIM3X-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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-accuracy measurement systems - emphasizing low noise, tight initial tolerance, and robust thermal stability.
FAQ
What is the output voltage range supported by LM4051BIM3X-ADJ/NOPB?
The LM4051BIM3X-ADJ/NOPB supports an adjustable output voltage range from 1.24 V to 10 V, determined by the external resistor divider (R1/R2) connected between cathode and anode pins. Its internal reference voltage is 1.212 V at 100 μA, and the output equation is VOUT = VREF × (1 + R1/R2). This range enables flexible system-level voltage scaling without changing the reference IC itself.
Does LM4051BIM3X-ADJ/NOPB require an external output capacitor for stability?
No, LM4051BIM3X-ADJ/NOPB does not require an external output capacitor for stability. Its advanced curvature-corrected bandgap design ensures stable operation with any capacitive load, including direct connection to ADC input filters or op-amp buffers. An input bypass capacitor (e.g., 0.1 μF ceramic) is recommended to reduce noise but is not mandatory for regulation.
What is the minimum operating current for LM4051BIM3X-ADJ/NOPB at room temperature?
The minimum operating current for LM4051BIM3X-ADJ/NOPB is 60 μA at 25°C, as specified for A-grade devices in the LM4051-ADJ Electrical Characteristics table. This low quiescent current enables ultra-low-power operation in battery-powered applications such as portable data loggers and wireless sensors while maintaining regulation and accuracy.
How does the pin configuration of LM4051BIM3X-ADJ/NOPB differ from the fixed-voltage LM4051-1.2 variant?
LM4051BIM3X-ADJ/NOPB uses Pin 3 as the feedback terminal (internally connected to the die cathode), which must be connected to the anode or system ground. In contrast, the LM4051-1.2 variant has Pin 3 designated as "NC" and must be left floating or tied to Pin 2. This structural difference reflects the adjustable vs. fixed topology and affects PCB layout and external component routing.
What is the guaranteed temperature coefficient for LM4051BIM3X-ADJ/NOPB across its full operating range?
The guaranteed maximum temperature coefficient for LM4051BIM3X-ADJ/NOPB is 50 ppm/°C over the extended temperature range of −40°C to +125°C. This specification applies to all grade versions (A/B/C) and ensures predictable voltage drift under thermal stress, supporting precision applications like industrial process control and automotive under-hood sensing where long-term stability is critical.
LM4051BIM3X-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:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.212V
- Voltage - Output (Max):
- 10 V
- Current - Output:
- 12 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051BIM3X-ADJ/NOPB FAQ
1.How can I place an order for LM4051BIM3X-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BIM3X-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 LM4051BIM3X-ADJ/NOPB reliable?
The price and inventory of LM4051BIM3X-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 LM4051BIM3X-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051BIM3X-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BIM3X-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BIM3X-ADJ/NOPB?
LM4051BIM3X-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BIM3X-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 LM4051BIM3X-ADJ/NOPB?
For technical support, including LM4051BIM3X-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BIM3X-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051BIM3X-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051BIM3X-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 LM4051BIM3X-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051BIM3X-ADJ/NOPB?
All LM4051BIM3X-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BIM3X-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 LM4051BIM3X-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4051BIM3X-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4051BIM3X-ADJ/NOPB Tags
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