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Texas Instruments LM4051CEM3-ADJ/NOPB
- Part No.:
- LM4051CEM3-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CEM3-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,885
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Product details
Overview
LM4051CEM3-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 wideband noise (10 Hz–10 kHz), and 50 ppm/°C max temperature coefficient across −40°C to +125°C. It serves as a stable reference in battery-powered data acquisition front-ends where low quiescent current and capacitive-load stability are critical.
For engineers reviewing the LM4051CEM3-ADJ/NOPB datasheet, LM4051CEM3-ADJ/NOPB pinout, LM4051CEM3-ADJ/NOPB application, or LM4051CEM3-ADJ/NOPB equivalent, key selection considerations include its adjustable output range, 60 μA minimum operating current, reverse breakdown architecture, feedback pin dependency for regulation, and SOT-23 thermal performance (RθJA = 214.7°C/W).
Technical Context
The LM4051CEM3-ADJ/NOPB operates as a curvature-corrected bandgap shunt reference requiring external feedback via cathode (Pin 2) and reference (Pin 3) terminals to set output voltage. Its internal amplifier compares divided output voltage against a 1.212 V nominal internal reference, enabling regulation without output capacitor dependency.
It functions only in closed-loop configurations with resistive divider feedback; open-loop use requires precise biasing to maintain linear region operation and sufficient gain. The device exhibits 0.3 Ω dynamic output impedance at 120 Hz (IR = 1 mA, VOUT = VREF) and supports stable operation with any capacitive load due to inherent compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - set by external R1/R2 divider; enables flexible system-level voltage scaling |
| Initial Tolerance (A-grade) | ±0.1% at 25°C - ensures high-accuracy ADC/DAC biasing without post-calibration |
| Tempco (max) | 50 ppm/°C over −40°C to +125°C - guarantees ≤±5.2 mV drift for 1.225 V reference point across industrial range |
| Operating Current Range | 60 μA to 12 mA - supports ultra-low-power sensor nodes and high-current clamp circuits |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - suitable for 16-bit+ data acquisition systems without added filtering |
| Dynamic Output Impedance | 0.3 Ω at 120 Hz - minimizes load-induced voltage droop during transient current steps |
| Feedback Current | 70–130 nA - enables high-impedance resistor networks (e.g., 1 MΩ dividers) with <0.13 mV error |
Pinout & Package
SOT-23-3 package (3.00 mm × 1.30 mm), DBZ variant, with gull-wing leads and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Common return path for feedback network and load; must be tied to system ground |
| Cathode (Pin 2) | Shunt current input / regulated output | Primary current sink terminal; output voltage appears here relative to anode; connects to series resistor (RS) from supply |
| Reference (Pin 3) | Feedback sense input | High-impedance input monitoring voltage divider midpoint; determines regulated cathode voltage via VOUT = VREF × (1 + R1/R2) |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables space-constrained PCB layouts and eliminates capacitor aging/reliability concerns in portable equipment |
| Tolerates capacitive loads | Stable with >100 nF output capacitance - simplifies EMI filtering and bypassing without phase-margin analysis |
| Adjustable 1.24–10 V output | Supports single-reference design across multiple rail voltages (e.g., 2.5 V, 3.3 V, 5 V) using standard 1% resistors |
| 60 μA min operating current | Permits operation from weak energy sources (e.g., piezoelectric harvesters, coin cells) while maintaining regulation |
| 50 ppm/°C tempco (guaranteed) | Meets Class I instrumentation accuracy requirements over full extended temperature range without calibration |
Applications
| Battery-Powered Data Acquisition | Precision Current Source |
|---|---|
Use Scenario: Portable environmental sensor node measuring temperature/humidity with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V reference for ADC and analog front-end op-amps. Use Value: 20 μVrms noise and 50 ppm/°C tempco ensure <0.01% measurement error across −20°C to +70°C operating range. | Use Scenario: Programmable LED driver with 100 μA–10 mA precision current setting. IC Role / Device Role / Timing Role: Adjustable reference establishing accurate current-sense voltage threshold for op-amp-controlled MOSFET. Use Value: 60 μA min current and 0.3 Ω output impedance enable stable 100 μA sourcing with <0.5% error at 10 mA load. |
| Voltage Level Detection | Clamp Protection Circuit |
Use Scenario: Microcontroller-based power supervisor detecting brown-out at 2.7 V supply rail. IC Role / Device Role / Timing Role: Adjustable shunt reference feeding comparator input to trigger reset when VCC falls below threshold. Use Value: ±0.1% initial tolerance and 70–130 nA feedback current allow 2.7 V detection with ±2.7 mV absolute accuracy using 1% resistors. | Use Scenario: Bidirectional signal line protection in industrial RS-485 transceivers. IC Role / Device Role / Timing Role: Paired LM4051CEM3-ADJ/NOPB units (anode-to-anode) forming ±2.4 V clamping reference. Use Value: Adjustable output enables precise clamp thresholds independent of process variation; 12 mA max current handles surge events without latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | Fixed 2.495 V output; 2% initial tolerance; higher 500 μA min current; 22 Ω typical output impedance | Not adjustable; unsuitable for sub-2.4 V or >5 V references; requires external compensation capacitor | Select when cost sensitivity outweighs accuracy needs and fixed 2.5 V suffices |
| MAX6008AEUR+T | Fixed 1.25 V output; ±0.2% tolerance; 35 ppm/°C tempco; 35 μA min current; SOT-23-3 | Lacks adjustability; lower noise (15 μVrms) but narrower voltage range; no feedback pin | Choose for ultra-low-power 1.25 V systems where adjustability is unnecessary |
Compared with TL431CDBVR and MAX6008AEUR+T, the LM4051CEM3-ADJ/NOPB uniquely combines A-grade ±0.1% tolerance, 1.24–10 V adjustability, and capacitor-free stability-making it optimal for high-accuracy, multi-rail, and space-constrained designs where reference flexibility and precision are non-negotiable.
Availability
LM4051CEM3-ADJ/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision current sources, voltage level detectors, and clamp protection circuits requiring stable component supply across automotive, industrial, and medical product lifecycles.
Supply support for LM4051CEM3-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 requiring guaranteed tempco and low-noise performance.
FAQ
What is the minimum operating current for LM4051CEM3-ADJ/NOPB?
The LM4051CEM3-ADJ/NOPB requires a minimum operating current of 60 μA across the industrial temperature range (−40°C to +85°C) and 70 μA over the extended range (−40°C to +125°C). This current flows through the cathode (Pin 2) and is necessary to bias the internal amplifier into its linear region for stable regulation. Below this threshold, the LM4051CEM3-ADJ/NOPB may cease regulation or exhibit increased output impedance and noise.
How is the output voltage set on LM4051CEM3-ADJ/NOPB?
The output voltage of LM4051CEM3-ADJ/NOPB is set using an external resistive divider between cathode (Pin 2) and anode (Pin 1), with the divider midpoint connected to the reference pin (Pin 3). The relationship is VOUT = VREF × (1 + R1/R2), where VREF = 1.212 V (typical). For example, R1 = 10 kΩ and R2 = 10 kΩ yields ~2.42 V. The LM4051CEM3-ADJ/NOPB's 70–130 nA feedback current introduces negligible error in standard 1% resistor networks.
Does LM4051CEM3-ADJ/NOPB require an output capacitor?
No, LM4051CEM3-ADJ/NOPB does not require an output capacitor for stability. Its internal compensation ensures robust operation with any capacitive load, including >100 nF ceramic or tantalum capacitors used for EMI suppression or local energy storage. This eliminates capacitor-related aging, leakage, and board space constraints-key advantages in portable and long-life applications where LM4051CEM3-ADJ/NOPB is deployed.
What is the temperature coefficient specification for LM4051CEM3-ADJ/NOPB?
The LM4051CEM3-ADJ/NOPB has a guaranteed maximum temperature coefficient of ±50 ppm/°C over the full −40°C to +125°C range for all grades (A/B/C). This means the output voltage drift is bounded by ±0.00525% per °C change from 25°C reference, resulting in ≤±5.2 mV total drift for a 1.225 V reference point across the industrial range. The LM4051CEM3-ADJ/NOPB achieves this via curvature-corrected bandgap design and wafer-level zener-zap trimming.
Can LM4051CEM3-ADJ/NOPB be used in bidirectional clamp circuits?
Yes, LM4051CEM3-ADJ/NOPB can be used in bidirectional clamp circuits by connecting two units anode-to-anode or cathode-to-cathode. In such configurations, each LM4051CEM3-ADJ/NOPB regulates one polarity-e.g., one sets +VCLAMP, the other −VCLAMP. Its adjustable output (1.24–10 V) allows precise, matched thresholds, and its 12 mA maximum shunt current handles transient surges. This application is explicitly validated in TI's LM4051-N datasheet Figure 25–27.
LM4051CEM3-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:
- ±0.5%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 75 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051CEM3-ADJ/NOPB FAQ
1.How can I place an order for LM4051CEM3-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CEM3-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 LM4051CEM3-ADJ/NOPB reliable?
The price and inventory of LM4051CEM3-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 LM4051CEM3-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051CEM3-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CEM3-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CEM3-ADJ/NOPB?
LM4051CEM3-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CEM3-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 LM4051CEM3-ADJ/NOPB?
For technical support, including LM4051CEM3-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CEM3-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051CEM3-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051CEM3-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 LM4051CEM3-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051CEM3-ADJ/NOPB?
All LM4051CEM3-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CEM3-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 LM4051CEM3-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4051CEM3-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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